From 3a592db49830306d15dab9edf649dfd79af0fb1e Mon Sep 17 00:00:00 2001
From: jsimomaa <jsimomaa@ac1ea38d-2e2b-0410-8846-a27921b304fc>
Date: Thu, 16 Oct 2014 06:55:20 +0000
Subject: [PATCH] Merged trunk@30111, @30195, @30274, @30356, @30385 to
 branches/sysdyn-1.8 on 2014-10-16 for 1.8.2 release.

refs #5198
refs #5224

git-svn-id: https://www.simantics.org/svn/simantics/sysdyn/branches/1.8@30413 ac1ea38d-2e2b-0410-8846-a27921b304fc
---
 .../fi/semantum/sysdyn/solver/Addition.java   |  11 +-
 .../src/fi/semantum/sysdyn/solver/Array.java  | 274 +++++++++--
 .../fi/semantum/sysdyn/solver/Assignment.java |  49 +-
 .../src/fi/semantum/sysdyn/solver/Break.java  |  29 ++
 .../fi/semantum/sysdyn/solver/Derivate.java   |  30 +-
 .../fi/semantum/sysdyn/solver/Division.java   |  23 +-
 .../sysdyn/solver/ElementwiseAddition.java    |  79 +++
 .../sysdyn/solver/ElementwiseDivision.java    |  59 ++-
 .../sysdyn/solver/ElementwisePower.java       |  53 +-
 .../sysdyn/solver/ElementwiseProduct.java     |  55 ++-
 .../sysdyn/solver/ElementwiseSubtraction.java |  80 +++
 .../semantum/sysdyn/solver/Environment.java   | 175 ++++++-
 .../sysdyn/solver/ExecutionException.java     |  18 +
 .../semantum/sysdyn/solver/ForStatement.java  |  17 +-
 .../fi/semantum/sysdyn/solver/Function.java   |  14 +-
 .../semantum/sysdyn/solver/GreaterThan.java   |   4 +-
 .../fi/semantum/sysdyn/solver/IStatement.java |   6 +-
 .../semantum/sysdyn/solver/IfStatement.java   |   6 +-
 .../src/fi/semantum/sysdyn/solver/Model.java  | 126 ++++-
 .../sysdyn/solver/MultiStatement.java         |   3 +-
 .../sysdyn/solver/Multiplication.java         |   8 +-
 .../fi/semantum/sysdyn/solver/Negation.java   |  25 +-
 .../src/fi/semantum/sysdyn/solver/Parser.java |  68 ++-
 .../src/fi/semantum/sysdyn/solver/Return.java |  29 ++
 .../src/fi/semantum/sysdyn/solver/Solver.java | 155 ++++--
 .../fi/semantum/sysdyn/solver/Statement.java  |   3 +-
 .../semantum/sysdyn/solver/StatementList.java |   8 +-
 .../semantum/sysdyn/solver/Subtraction.java   |  25 +-
 .../src/fi/semantum/sysdyn/solver/Utils.java  |   2 +
 .../fi/semantum/sysdyn/solver/Variable.java   |  47 +-
 .../semantum/sysdyn/solver/VariableBase.java  |  67 +--
 .../src/fi/semantum/sysdyn/solver/While.java  |  10 +-
 .../sysdyn/solver/parser/ModelParser.java     | 270 ++++++-----
 .../parser/ModelParserTokenManager.java       | 457 +++++++++---------
 .../sysdyn/solver/parser/ModelicaParser.jj    |  76 +--
 .../sysdyn/solver/parser/ModelicaParser.jjt   |  20 +-
 .../sysdyn/solver/parser/SimpleNode.java      |   1 +
 37 files changed, 1717 insertions(+), 665 deletions(-)
 create mode 100644 fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Break.java
 create mode 100644 fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseAddition.java
 create mode 100644 fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseSubtraction.java
 create mode 100644 fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ExecutionException.java
 create mode 100644 fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Return.java

diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Addition.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Addition.java
index 8c09ab6f..6c531d41 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Addition.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Addition.java
@@ -12,6 +12,8 @@ package fi.semantum.sysdyn.solver;
 
 import java.util.Map;
 
+import fi.semantum.sysdyn.solver.Array.Modifier2;
+
 public class Addition implements IExpression {
 	
     public IExpression exp1;
@@ -38,7 +40,14 @@ public class Addition implements IExpression {
 		if(o1 instanceof Array && o2 instanceof Array) {
 			Array la = (Array)o1;
 			Array ra = (Array)o2;
-			return la.add(ra);
+			return la.copy2(ra, new Modifier2() {
+				
+				@Override
+				public Object modify(Object o1, Object o2) {
+					if(o1 instanceof Double && o2 instanceof Double) return ((Double)o1)+((Double)o2);
+					throw new IllegalStateException("Tried to add a non-numerical array");
+				}
+			});
 		}
 		throw new IllegalStateException();
 	}
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Array.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Array.java
index 68a0504b..cb16d4b9 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Array.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Array.java
@@ -16,11 +16,16 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 
+/*
+ * For matrices first dimension is rows and second is columns i.e. top level elements are rows
+ */
 public class Array implements IExpression {
 
 	public static final Array FULL = new Array();
 	
 	final private ArrayList<Object> elements;
+	
+	boolean isVector = true;
 
 	public Array() {
 		elements = new ArrayList<Object>();
@@ -32,7 +37,15 @@ public class Array implements IExpression {
 
 	public Array addElement(Object element) {
 		if(element instanceof Constant) addElement(((Constant)element).value);
-		else elements.add(element);
+		else {
+			
+//			if(element instanceof Double)
+//				if(Double.isNaN((Double)element))
+//					throw new IllegalStateException();
+
+			if(element instanceof Array) isVector = false;
+			elements.add(element);
+		}
 		return this;
 	}
 	
@@ -68,7 +81,15 @@ public class Array implements IExpression {
 	}
 	
 	public int size(int col) {
-		return elements.size();
+		
+		if(col == 1) return elements.size();
+
+		if(elements.isEmpty()) throw new IllegalStateException();
+		Object elem = element(0);
+		if(!(elem instanceof Array)) throw new IllegalStateException();
+		
+		return ((Array)elem).size(col-1);
+		
 	}
 	
 	public Object element(int index) {
@@ -283,23 +304,22 @@ public class Array implements IExpression {
 		throw new IllegalStateException();
 		
 	}
-	
-	public Array add(Array other) {
-		Array result = new Array();
+
+	/*
+	 * Both arrays are vectors 
+	 */
+	public double inner(Array other) {
+		double result = 0;
 		Collection<Object> lae = elements();
 		Collection<Object> rae = other.elements();
-		if(lae.size() != rae.size()) throw new IllegalStateException();
+		if(lae.size() != rae.size()) throw new IllegalStateException("inner product: vector sizes do not match: " + this + " vs. " + other);
 		Iterator<Object> li = lae.iterator();
 		Iterator<Object> ri = rae.iterator();
 		for(int i=0;i<lae.size();i++) {
 			Object l = li.next();
 			Object r = ri.next();
 			if(l instanceof Double && r instanceof Double) {
-				result.addElement(((Double)l)+((Double)r));
-			} else if (l instanceof Array && r instanceof Array) {
-				Array arr = (Array)l;
-				Array otherArr = (Array)r;
-				result.addElement(arr.add(otherArr));
+				result += ((Double)l)*((Double)r);
 			} else {
 				throw new IllegalStateException();
 			}
@@ -307,29 +327,37 @@ public class Array implements IExpression {
 		return result;
 	}
 
-	public Array mul(Array other) {
+	/*
+	 * Other array is vector (this is matrix)
+	 */
+	public Array matrixMulVector(Array other) {
 		Array result = new Array();
-		Collection<Object> lae = elements();
-		Collection<Object> rae = other.elements();
-		if(lae.size() != rae.size()) throw new IllegalStateException();
-		Iterator<Object> li = lae.iterator();
-		Iterator<Object> ri = rae.iterator();
-		for(int i=0;i<lae.size();i++) {
-			Object l = li.next();
-			Object r = ri.next();
-			if(l instanceof Double && r instanceof Double) {
-				result.addElement(((Double)l)*((Double)r));
-			} else if (l instanceof Array && r instanceof Array) {
-				Array arr = (Array)l;
-				Array otherArr = (Array)r;
-				result.addElement(arr.mul(otherArr));
-			} else {
-				throw new IllegalStateException();
-			}
+		for(Object o : elements) {
+			// Objects are rows
+			Array a = (Array)o;
+			result.addElement(a.inner(other));
 		}
 		return result;
 	}
 
+	/*
+	 * Other array is matrix (this is matrix)
+	 */
+	public Array matrixMulMatrix(Array other) {
+		Array result = new Array();
+		Array transposed = other.transposed();
+		for(Object rightColumn_ : transposed.elements()) {
+			Array rightColumn = (Array)rightColumn_;
+			Array resultColumn = new Array();
+			for(Object leftRow_ : elements) {
+				Array leftRow = (Array)leftRow_;
+				resultColumn.addElement(leftRow.inner(rightColumn));
+			}
+			result.addElement(resultColumn);
+		}
+		return result.transposed();
+	}
+
 	public Array pow(Array other) {
 		Array result = new Array();
 		Collection<Object> lae = elements();
@@ -378,5 +406,193 @@ public class Array implements IExpression {
 		}
 		return result;
 	}
+	
+	interface Modifier {
+		Object modify(Object o);
+	}
+	
+	interface Modifier2 {
+		Object modify(Object o1, Object o2);
+	}
+
+	public Array copy(Modifier modifier) {
+		Array result = new Array();
+		for(Object element : elements) {
+			if(element instanceof Array) {
+				Array sub = (Array)element;
+				result.addElement(sub.copy(modifier));
+			} else {
+				result.addElement(modifier.modify(element));
+			}
+		}
+		return result;
+	}
+	
+	public Array copy2(Array other, Modifier2 modifier) {
+		Array result = new Array();
+		Collection<Object> es = elements();
+		Collection<Object> oes = other.elements();
+		if(es.size() != oes.size()) throw new IllegalStateException("Array dimensions do not match");
+		Iterator<Object> e = es.iterator();
+		Iterator<Object> oe = oes.iterator();
+		for(int i=0;i<es.size();i++) {
+			Object element = e.next();
+			Object otherElement = oe.next();
+			if(element instanceof Array) {
+				if(otherElement instanceof Array) {
+					result.addElement(((Array)element).copy2((Array)otherElement, modifier));
+				} else {
+					throw new IllegalStateException("Array dimensions do not match");
+				}
+			} else {
+				if(otherElement instanceof Array) {
+					throw new IllegalStateException("Array dimensions do not match");
+				} else {
+					result.addElement(modifier.modify(element, otherElement));
+				}
+			}				
+		}
+		return result;
+	}
+
+	public boolean isVector() {
+		return isVector;
+	}
+
+	private Object subscript(IEnvironment environment, IExpression[] subscripts, int position) {
+		
+		IExpression e = subscripts[position];
+		Object indexObject = e.evaluate(environment);
+		int index = Utils.getIndex(indexObject);
+		if(index == -2) {
+			Array ret = new Array();
+			for(Object element : elements) {
+				// Last position should not be array
+				if(position == subscripts.length-1) {
+					if(element instanceof Array) throw new IllegalStateException();
+					if(element instanceof IExpression) {
+						IExpression exp = (IExpression)element;
+						ret.addElement(exp.evaluate(environment));
+					} else {
+						ret.addElement(element);
+					}
+				} else {
+					if(element instanceof Array) {
+						ret.addElement(((Array)element).subscript(environment, subscripts, position+1));
+					} else {
+						throw new IllegalStateException();
+					}
+				}
+			}
+			return ret;
+		} else if (index == -3) {
+			
+			Array arr = (Array)indexObject;
+			Array ret = new Array();
+			for(Object indexO : arr.elements()) {
+				index = ((Double)indexO).intValue()-1;
+				Object element = element(index);
+				// Last position should not be array
+				if(position == subscripts.length-1) {
+					if(element instanceof Array) throw new IllegalStateException();
+					if(element instanceof IExpression) {
+						IExpression exp = (IExpression)element;
+						ret.addElement(exp.evaluate(environment));
+					} else {
+						ret.addElement(element);
+					}
+				} else {
+					if(element instanceof Array) {
+						ret.addElement(((Array)element).subscript(environment, subscripts, position+1));
+					} else {
+						throw new IllegalStateException();
+					}
+				}
+			}
+			return ret;
+			
+		} else {
+			Object element = element(index);
+			// Last position should not be array
+			if(position == subscripts.length-1) {
+				if(element instanceof Array) throw new ExecutionException("Array size does not match subscripts.");
+				if(element instanceof IExpression) {
+					IExpression exp = (IExpression)element;
+					return exp.evaluate(environment);
+				} else {
+					return element;
+				}
+			} else {
+				if(element instanceof Array) {
+					return ((Array)element).subscript(environment, subscripts, position+1);
+				} else {
+					throw new IllegalStateException();
+				}
+			}
+		}
+		
+	}
+	
+	public Object subscript(IEnvironment environment, IExpression[] subscripts) {
+		return subscript(environment, subscripts, 0);
+	}
+
+	public void applyPartial(Array[] indices, Array value, int pos) {
+		Array arr = indices[pos];
+		if(Array.FULL == arr) {
+			for(int i=0;i<elements.size();i++) {
+				if(pos < (indices.length-1)) {
+					((Array)elements.get(i)).applyPartial(indices, (Array)value.element(i), pos+1);
+				} else {
+					elements.set(i, value.element(i));
+				}
+			}
+		} else if(arr.dimension() == 1) {
+			int index = ((Double)arr.element(0)).intValue();
+			if(pos < (indices.length-1)) {
+				((Array)elements.get(index)).applyPartial(indices, value, pos+1);
+			} else {
+				elements.set(index, (Array)value.element(index));
+			}
+		} else {
+			for(Object element : arr.elements) {
+				int i = ((Double)element).intValue();
+				if(pos < (indices.length-1)) {
+					((Array)elements.get(i)).applyPartial(indices, (Array)value.element(i), pos+1);
+				} else {
+					elements.set(i, value.element(i));
+				}
+			}
+		}
+	}
+
+	public void applyPartial(Array[] indices, Array value) {
+		applyPartial(indices, value, 0);
+	}
+	
+	public Array transposed() {
+		
+		List<Object> elements = elements();
+		if(elements.isEmpty()) return this;
+		
+		Array first = (Array)elements.get(0);
+		
+		Array[] arrs = new Array[first.elements().size()];
+		for(int i=0;i<arrs.length;i++) arrs[i] = new Array();
+		
+		for(int i=0;i<elements.size();i++) {
+			Array a = (Array)elements.get(i);
+			for(int j=0;j<a.elements().size();j++) {
+				Object o = a.element(j);
+				arrs[j].addElement(o);
+			}
+		}
+
+		Array result = new Array();
+		for(Array a : arrs) result.addElement(a);
+
+		return result;
+		
+	}
 
 }
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Assignment.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Assignment.java
index 6607c198..67752379 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Assignment.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Assignment.java
@@ -10,16 +10,19 @@
  *******************************************************************************/
 package fi.semantum.sysdyn.solver;
 
-
 public class Assignment {
-	
+
+	private static final boolean VALIDATE = true;	
+
+	public IFrame model;
 	public Variable target;
 	public IExpression[] subscripts;
     public IExpression expression;
     public boolean assigned = false;
     public boolean isConstant = false;
     
-    public Assignment(Variable target, IExpression[] subscripts, IExpression expression) {
+    public Assignment(IFrame model, Variable target, IExpression[] subscripts, IExpression expression) {
+    	this.model = model;
     	this.target = target;
     	this.subscripts = subscripts;
     	this.expression = expression;
@@ -35,10 +38,46 @@ public class Assignment {
     		IExpression[] subscripts2 = new IExpression[subscripts.length];
     		for(int i=0;i<subscripts.length;i++)
     			subscripts2[i] = subscripts[i].withBase(frame, prefix);
-    		return new Assignment(target.withBase(frame, prefix), subscripts2, expression.withBase(frame, prefix));
+    		return new Assignment(frame, target.withBase(frame, prefix), subscripts2, expression.withBase(frame, prefix));
     	} else {
-    		return new Assignment(target.withBase(frame, prefix), null, expression.withBase(frame, prefix));
+    		return new Assignment(frame, target.withBase(frame, prefix), null, expression.withBase(frame, prefix));
+    	}
+    }
+    
+    public void assign(IEnvironment env) {
+    	try {
+			Object value = expression.evaluate(env);
+			if(value != null) {
+				validate(target, value);
+				target.assign(env, subscripts, value);
+				assigned = true;
+			}
+    	} catch (ExecutionException e) {
+    		if(model instanceof Model) {
+    			throw new ExecutionException("Line " + (target.line-((Model)model).line) + ": while evaluating " + target.base.name + ": " + e.getMessage());
+    		} else {
+    			throw new ExecutionException("While evaluating " + target.base.name + ": " + e.getMessage());
+    		}
     	}
     }
     
+    
+	private void validate(Variable var, Object value) {
+		if(VALIDATE) {
+			if(value instanceof Double) {
+				if(Double.isNaN((Double)value)) {
+					System.err.println("value is invalid (NaN): " + var.base.name);
+					throw new IllegalStateException("value is invalid (NaN)");
+				}
+				if(Double.isInfinite((Double)value)) {
+					System.err.println("value is invalid (Infinite): " + var.base.name);
+					throw new IllegalStateException("value is invalid (Infinite)");
+				}
+			}
+			if(value instanceof Array) {
+				for(Object o : ((Array)value).elements()) validate(var, o);
+			}
+		}
+	}
+    
 }
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Break.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Break.java
new file mode 100644
index 00000000..588cfe06
--- /dev/null
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Break.java
@@ -0,0 +1,29 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Semantum Oy.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package fi.semantum.sysdyn.solver;
+
+
+public class Break implements IStatement {
+	
+    public Break() {
+    }
+    
+    @Override
+    public String toString() {
+    	return "break";
+    }
+    
+    @Override
+    public ReturnValue evaluate(IEnvironment environment) {
+    	return ReturnValue.BREAK;
+    }
+    
+}
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Derivate.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Derivate.java
index 7d26af56..b5194f7f 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Derivate.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Derivate.java
@@ -12,6 +12,8 @@ package fi.semantum.sysdyn.solver;
 
 import java.util.Map;
 
+import fi.semantum.sysdyn.solver.Array.Modifier2;
+
 public class Derivate implements IExpression {
 
 	private Variable variable;
@@ -26,12 +28,32 @@ public class Derivate implements IExpression {
 	
 	@Override
 	public Object evaluate(IEnvironment _environment) {
-		Environment environment = (Environment)_environment;
-//		Double old = (Double)environment.getValue(variable.name + variable.subscriptKey());
-		Double old = (Double)environment.getValue(variable.base.index(_environment, subscripts));
+		final Environment environment = (Environment)_environment;
+		Object old = variable.evaluate(environment);
+		
 		// FIXME: should not be fixed like this
 		if(old == null) old = 0.0;
-		return old+environment.step*(Double)e.evaluate(environment);
+		Object eval = e.evaluate(environment);
+		if(eval instanceof Double) {
+			return ((Double)old)+environment.step*(Double)eval;
+		} else if (eval instanceof Array) {
+			Array arr = (Array)eval;
+			Array oldArray = (Array)old;
+			
+			return oldArray.copy2(arr, new Modifier2() {
+
+				@Override
+				public Object modify(Object o1, Object o2) {
+					Double oldValue = (Double)o1;
+					Double der = (Double)o2;
+					return oldValue + environment.step*der;
+				}
+				
+			});
+			
+		} else {
+			throw new UnsupportedOperationException();
+		}
 	}
 	
 	@Override
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Division.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Division.java
index d8d357fe..42ce0597 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Division.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Division.java
@@ -12,6 +12,8 @@ package fi.semantum.sysdyn.solver;
 
 import java.util.Map;
 
+import fi.semantum.sysdyn.solver.Array.Modifier;
+
 public class Division implements IExpression {
 	
     public IExpression exp1;
@@ -27,16 +29,17 @@ public class Division implements IExpression {
     	return exp1 + " / " + exp2;
     }
     
-    private Array arrayDiv(Array a, Double d) {
-    	Array result = new Array();
-    	for(Object o : a.elements()) {
-    		if(o instanceof Double) {
-    			result.addElement((Double)o/d);
-    		} else {
-    			throw new IllegalStateException();
-    		}
-    	}
-    	return result;
+    private Array arrayDiv(Array a, final Double d) {
+    	return a.copy(new Modifier() {
+			@Override
+			public Object modify(Object o) {
+	    		if(o instanceof Double) {
+	    			return ((Double)o)/d;
+	    		} else {
+	    			throw new IllegalStateException();
+	    		}
+			}
+		});
     }
     
 	@Override
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseAddition.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseAddition.java
new file mode 100644
index 00000000..ff08ca61
--- /dev/null
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseAddition.java
@@ -0,0 +1,79 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Semantum Oy.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package fi.semantum.sysdyn.solver;
+
+import java.util.Map;
+
+import fi.semantum.sysdyn.solver.Array.Modifier2;
+
+public class ElementwiseAddition implements IExpression {
+	
+    public IExpression exp1;
+    public IExpression exp2;
+    
+    public ElementwiseAddition(IExpression exp1, IExpression exp2) {
+    	this.exp1 = exp1;
+    	this.exp2 = exp2;
+    }
+    
+    @Override
+    public String toString() {
+    	return exp1 + " + " + exp2;
+    }
+    
+	@Override
+	public Object evaluate(IEnvironment environment) {
+		Object o1 = exp1.evaluate(environment);
+		Object o2 = exp2.evaluate(environment);
+		if(o1 == null || o2 == null) return null; 
+		if(o1 instanceof Double && o2 instanceof Double) {
+			return (Double)o1 + (Double)o2;
+		}
+		if(o1 instanceof Array && o2 instanceof Array) {
+			Array la = (Array)o1;
+			Array ra = (Array)o2;
+			return la.copy2(ra, new Modifier2() {
+				
+				@Override
+				public Object modify(Object o1, Object o2) {
+					if(o1 instanceof Double && o2 instanceof Double) return ((Double)o1)+((Double)o2);
+					throw new IllegalStateException("Tried to add a non-numerical array");
+				}
+			});
+		}
+		throw new IllegalStateException();
+	}
+	
+	@Override
+	public IExpression withBase(IFrame frame, String prefix) {
+		return new ElementwiseAddition(exp1.withBase(frame, prefix), exp2.withBase(frame, prefix));
+	}
+    
+	@Override
+	public Object getPossibleConstant() {
+		return null;
+	}
+	
+	@Override
+	public IExpression rewrite(IFrame frame, Map<String, VariableBase> copies) {
+		exp1 = exp1.rewrite(frame, copies);
+		exp2 = exp2.rewrite(frame, copies);
+		return this;
+	}
+	
+	@Override
+	public void accept(ExpressionVisitor visitor) {
+		visitor.visit(this);
+		exp1.accept(visitor);
+		exp2.accept(visitor);
+	}
+	
+}
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseDivision.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseDivision.java
index 77362aa5..ffb93df7 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseDivision.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseDivision.java
@@ -10,10 +10,11 @@
  *******************************************************************************/
 package fi.semantum.sysdyn.solver;
 
-import java.util.Collection;
-import java.util.Iterator;
 import java.util.Map;
 
+import fi.semantum.sysdyn.solver.Array.Modifier;
+import fi.semantum.sysdyn.solver.Array.Modifier2;
+
 public class ElementwiseDivision implements IExpression {
 	
     public IExpression exp1;
@@ -36,29 +37,41 @@ public class ElementwiseDivision implements IExpression {
 		if(left instanceof Array && right instanceof Array) {
 			Array la = (Array)left;
 			Array ra = (Array)right;
-			Collection<Object> lae = la.elements();
-			Collection<Object> rae = ra.elements();
-			if(lae.size() != rae.size()) throw new UnsupportedOperationException();
-			Iterator<Object> li = lae.iterator();
-			Iterator<Object> ri = rae.iterator();
-			Array result = new Array();
-			for(int i=0;i<lae.size();i++) {
-				double ld = (Double)li.next();
-				double rd = (Double)ri.next();
-				result.addElement(ld/rd);
-			}
-			return result;
+			return la.copy2(ra, new Modifier2() {
+				
+				@Override
+				public Object modify(Object o1, Object o2) {
+					if(o1 instanceof Double && o2 instanceof Double) return ((Double)o1)/((Double)o2);
+					throw new IllegalStateException("Tried to divide a non-numerical array");
+				}
+				
+			});
 		} else if(left instanceof Array && right instanceof Double) {
 			Array la = (Array)left;
-			double rd = (Double)right;
-			Collection<Object> lae = la.elements();
-			Iterator<Object> li = lae.iterator();
-			Array result = new Array();
-			for(int i=0;i<lae.size();i++) {
-				double ld = (Double)li.next();
-				result.addElement(ld/rd);
-			}
-			return result;
+			final double rd = (Double)right;
+			return la.copy(new Modifier() {
+
+				@Override
+				public Object modify(Object o) {
+					if(o instanceof Double) return ((Double)o)/rd;
+					else throw new IllegalStateException("Tried to divide a non-numerical array");
+				}
+				
+			});
+		} else if(left instanceof Double && right instanceof Array) {
+			Array la = (Array)right;
+			final double rd = (Double)left;
+			return la.copy(new Modifier() {
+
+				@Override
+				public Object modify(Object o) {
+					if(o instanceof Double) return rd / ((Double)o);
+					else throw new IllegalStateException("Tried to divide a non-numerical array");
+				}
+				
+			});
+		} else if(left instanceof Double && right instanceof Double) {
+			return ((Double)left)/((Double)right);
 		} else {
 			throw new UnsupportedOperationException();
 		}
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwisePower.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwisePower.java
index 6fac7280..15ac7bc5 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwisePower.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwisePower.java
@@ -10,10 +10,11 @@
  *******************************************************************************/
 package fi.semantum.sysdyn.solver;
 
-import java.util.Collection;
-import java.util.Iterator;
 import java.util.Map;
 
+import fi.semantum.sysdyn.solver.Array.Modifier;
+import fi.semantum.sysdyn.solver.Array.Modifier2;
+
 public class ElementwisePower implements IExpression {
 	
     public IExpression exp1;
@@ -36,19 +37,41 @@ public class ElementwisePower implements IExpression {
 		if(left instanceof Array && right instanceof Array) {
 			Array la = (Array)left;
 			Array ra = (Array)right;
-			Collection<Object> lae = la.elements();
-			Collection<Object> rae = ra.elements();
-			if(lae.size() != rae.size()) throw new UnsupportedOperationException();
-			Iterator<Object> li = lae.iterator();
-			Iterator<Object> ri = rae.iterator();
-			Array result = new Array();
-			for(int i=0;i<lae.size();i++) {
-				double ld = (Double)li.next();
-				double rd = (Double)ri.next();
-				result.addElement(Math.pow(ld,rd));
-			}
-			return result;
-		} else throw new UnsupportedOperationException();
+			return la.copy2(ra, new Modifier2() {
+				
+				@Override
+				public Object modify(Object o1, Object o2) {
+					if(o1 instanceof Double && o2 instanceof Double) return Math.pow((Double)o1,(Double)o2);
+					throw new IllegalStateException("Tried to pow a non-numerical array");
+				}
+			});
+		} else if (left instanceof Array && right instanceof Double) {
+			Array la = (Array)left;
+			final double rd = (Double)right;
+			return la.copy(new Modifier() {
+
+				@Override
+				public Object modify(Object o) {
+					if(o instanceof Double) return Math.pow((Double)o,rd);
+					else throw new IllegalStateException("Tried to pow a non-numerical array");
+				}
+				
+			});
+		} else if (left instanceof Double && right instanceof Array) {
+			Array la = (Array)right;
+			final double rd = (Double)left;
+			return la.copy(new Modifier() {
+
+				@Override
+				public Object modify(Object o) {
+					if(o instanceof Double) return Math.pow(rd,(Double)o);
+					else throw new IllegalStateException("Tried to pow a non-numerical array");
+				}
+				
+			});
+		} else {
+			throw new UnsupportedOperationException();
+		}
 	}
 	
 	@Override
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseProduct.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseProduct.java
index f87529c5..b15f6781 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseProduct.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseProduct.java
@@ -10,11 +10,11 @@
  *******************************************************************************/
 package fi.semantum.sysdyn.solver;
 
-import java.util.Collection;
-import java.util.Iterator;
-import java.util.List;
 import java.util.Map;
 
+import fi.semantum.sysdyn.solver.Array.Modifier;
+import fi.semantum.sysdyn.solver.Array.Modifier2;
+
 public class ElementwiseProduct implements IExpression {
 	
     public IExpression exp1;
@@ -37,27 +37,38 @@ public class ElementwiseProduct implements IExpression {
 		if(left instanceof Array && right instanceof Array) {
 			Array la = (Array)left;
 			Array ra = (Array)right;
-			List<Object> lae = la.elements();
-			List<Object> rae = ra.elements();
-			if(lae.size() != rae.size()) throw new UnsupportedOperationException();
-			Array result = new Array(lae.size());
-			int index = 0;
-			for(Object o : lae) {
-				Double ld = (Double)o;
-				Double rd = (Double)rae.get(index++);
-				result.addElement(ld*rd);
-			}
-			return result;
+			return la.copy2(ra, new Modifier2() {
+				
+				@Override
+				public Object modify(Object o1, Object o2) {
+					if(o1 instanceof Double && o2 instanceof Double) return ((Double)o1)*((Double)o2);
+					throw new IllegalStateException("Tried to multiply a non-numerical array");
+				}
+			});
 		} else if (left instanceof Array && right instanceof Double) {
 			Array la = (Array)left;
-			Double rd = (Double)right;
-			List<Object> lae = la.elements();
-			Array result = new Array(lae.size());
-			for(Object o : lae) {
-				Double ld = (Double)o;
-				result.addElement(ld*rd);
-			}
-			return result;
+			final double rd = (Double)right;
+			return la.copy(new Modifier() {
+
+				@Override
+				public Object modify(Object o) {
+					if(o instanceof Double) return ((Double)o)*rd;
+					else throw new IllegalStateException("Tried to multiply a non-numerical array");
+				}
+				
+			});
+		} else if (left instanceof Double && right instanceof Array) {
+			Array la = (Array)right;
+			final double rd = (Double)left;
+			return la.copy(new Modifier() {
+
+				@Override
+				public Object modify(Object o) {
+					if(o instanceof Double) return ((Double)o)*rd;
+					else throw new IllegalStateException("Tried to multiply a non-numerical array");
+				}
+				
+			});
 		} else {
 			throw new UnsupportedOperationException();
 		}
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseSubtraction.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseSubtraction.java
new file mode 100644
index 00000000..55a36627
--- /dev/null
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ElementwiseSubtraction.java
@@ -0,0 +1,80 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Semantum Oy.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package fi.semantum.sysdyn.solver;
+
+import java.util.Map;
+
+import fi.semantum.sysdyn.solver.Array.Modifier2;
+
+public class ElementwiseSubtraction implements IExpression {
+	
+    public IExpression exp1;
+    public IExpression exp2;
+    
+    public ElementwiseSubtraction(IExpression exp1, IExpression exp2) {
+    	if(exp1 == null) exp1 = new Constant("0");
+    	this.exp1 = exp1;
+    	this.exp2 = exp2;
+    }
+    
+    @Override
+    public String toString() {
+    	return exp1 + " - " + exp2;
+    }
+    
+	@Override
+	public Object evaluate(IEnvironment environment) {
+		Object o1 = exp1.evaluate(environment);
+		Object o2 = exp2.evaluate(environment);
+		if(o1 == null || o2 == null) return null; 
+		if(o1 instanceof Double && o2 instanceof Double) {
+			return (Double)o1 - (Double)o2;
+		}
+		if(o1 instanceof Array && o2 instanceof Array) {
+			Array la = (Array)o1;
+			Array ra = (Array)o2;
+			return la.copy2(ra, new Modifier2() {
+				
+				@Override
+				public Object modify(Object o1, Object o2) {
+					if(o1 instanceof Double && o2 instanceof Double) return ((Double)o1)-((Double)o2);
+					throw new IllegalStateException("Tried to subtract a non-numerical array");
+				}
+			});
+		}
+		throw new IllegalStateException();
+	}
+	
+	@Override
+	public IExpression withBase(IFrame frame, String prefix) {
+		return new ElementwiseSubtraction(exp1.withBase(frame, prefix), exp2.withBase(frame, prefix));
+	}
+    
+	@Override
+	public Object getPossibleConstant() {
+		return null;
+	}
+    
+	@Override
+	public IExpression rewrite(IFrame frame, Map<String, VariableBase> copies) {
+		exp1 = exp1.rewrite(frame, copies);
+		exp2 = exp2.rewrite(frame, copies);
+		return this;
+	}
+	
+	@Override
+	public void accept(ExpressionVisitor visitor) {
+		visitor.visit(this);
+		exp1.accept(visitor);
+		exp2.accept(visitor);
+	}
+	
+}
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Environment.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Environment.java
index d3cfce24..135410d7 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Environment.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Environment.java
@@ -11,6 +11,7 @@
  *******************************************************************************/
 package fi.semantum.sysdyn.solver;
 
+import fi.semantum.sysdyn.solver.Array.Modifier;
 import gnu.trove.list.array.TIntArrayList;
 import gnu.trove.map.hash.TObjectIntHashMap;
 
@@ -28,7 +29,7 @@ interface Fn {
 	public Object evaluateInput(IEnvironment environment, int argPosition);
 	public void setLocals(IEnvironment environment);
 	public int offset();
-	public Variable[] parameters();
+	public Variable[] parameters(int args);
 }
 
 abstract class Fn1 implements Fn {
@@ -36,17 +37,25 @@ abstract class Fn1 implements Fn {
 	Variable[] parameters;
 	
 	public Fn1(int pCount) {
-		parameters = new Variable[pCount];
-		for(int i=0;i<pCount;i++)
-			parameters[i] = new Variable(new VariableBase("", i));
+		if(pCount > 0) {
+			parameters = new Variable[pCount];
+			for(int i=0;i<pCount;i++)
+				parameters[i] = new Variable(new VariableBase("", i));
+		}
 	}
 	
 	public int offset() {
 		return 0;
 	}
 	
-	public Variable[] parameters() {
-		return parameters;
+	public Variable[] parameters(int argc) {
+		if(parameters != null) return parameters;
+		else {
+			Variable[] ret = new Variable[argc];
+			for(int i=0;i<argc;i++)
+				ret[i] = new Variable(new VariableBase("", i));
+			return ret;
+		}
 	}
 	
 	@Override
@@ -271,24 +280,164 @@ final public class Environment implements IEnvironment, ISystem {
 			@Override
 			public Object evaluate(IEnvironment environment, int argc) {
 				Object value = environment.getValue(0);
-				Double result = (Double)value;
-				double res = result.intValue(); 
-				return res;
+				if(value instanceof Double) {
+					double d = ((Double)value).intValue(); 
+					return d;
+				} else if(value instanceof Array) {
+					return ((Array)value).copy(new Modifier() {
+
+						@Override
+						public Object modify(Object o) {
+							if(o instanceof Double) {
+								double d = ((Double)o).intValue(); 
+								return d;
+							} else {
+								throw new IllegalStateException();
+							}
+						}
+						
+					});
+				} else {
+					throw new IllegalStateException();
+				}
 			}
 			
 		});
-		model.functions.put("sum", new Fn1(1) {
+		model.functions.put("ceil", new Fn1(1) {
 
 			@Override
 			public Object evaluate(IEnvironment environment, int argc) {
 				Object value = environment.getValue(0);
-				Array arr = (Array)value;
+				if(value instanceof Double) {
+					return Math.ceil((Double)value);
+				} else if(value instanceof Array) {
+					return ((Array)value).copy(new Modifier() {
+
+						@Override
+						public Object modify(Object o) {
+							if(o instanceof Double) {
+								return Math.ceil((Double)o);
+							} else {
+								throw new IllegalStateException();
+							}
+						}
+						
+					});
+				} else {
+					throw new IllegalStateException();
+				}
+			}
+			
+		});
+		model.functions.put("floor", new Fn1(1) {
+
+			@Override
+			public Object evaluate(IEnvironment environment, int argc) {
+				Object value = environment.getValue(0);
+				if(value instanceof Double) {
+					return Math.floor((Double)value);
+				} else if(value instanceof Array) {
+					return ((Array)value).copy(new Modifier() {
+
+						@Override
+						public Object modify(Object o) {
+							if(o instanceof Double) {
+								return Math.floor((Double)o);
+							} else {
+								throw new IllegalStateException();
+							}
+						}
+						
+					});
+				} else {
+					throw new IllegalStateException();
+				}
+			}
+			
+		});
+		model.functions.put("sum", new Fn1(1) {
+
+			public double sum(Array a) {
 				double res = 0;
-				for(Object o : arr.elements())
-					res += (Double)o;
+				for(Object element : a.elements()) {
+					if(element instanceof Array) {
+						res += sum((Array)element);
+					} else if(element instanceof Double) {
+						res += (Double)element;
+					} else {
+						throw new IllegalStateException("Tried to sum a non-numerical array");
+					}
+				}
 				return res;
 			}
 			
+			@Override
+			public Object evaluate(IEnvironment environment, int argc) {
+				Object value = environment.getValue(0);
+				if(value instanceof Double) return (Double)value;
+				Array arr = (Array)value;
+				return sum(arr);
+			}
+			
+		});
+		model.functions.put("ones", new Fn1(-1) {
+
+			private Array make(int[] dims, int pos) {
+				Array result = new Array();
+				int d = dims[pos];
+				if(pos == dims.length - 1) {
+					for(int i=0;i<d;i++) result.addElement(1.0);
+				} else {
+					for(int i=0;i<d;i++) result.addElement(make(dims, pos+1));
+				}
+				return result;
+			}
+			
+			@Override
+			public Object evaluate(IEnvironment environment, int argc) {
+				int[] dims = new int[argc];
+				for(int i=0;i<argc;i++) {
+					Double d = (Double)environment.getValue(i);
+					dims[i] = d.intValue();
+				}
+				return make(dims, 0);
+			}
+			
+		});
+		model.functions.put("zeros", new Fn1(-1) {
+
+			private Array make(int[] dims, int pos) {
+				Array result = new Array();
+				int d = dims[pos];
+				if(pos == dims.length - 1) {
+					for(int i=0;i<d;i++) result.addElement(0.0);
+				} else {
+					for(int i=0;i<d;i++) result.addElement(make(dims, pos+1));
+				}
+				return result;
+			}
+			
+			@Override
+			public Object evaluate(IEnvironment environment, int argc) {
+				int[] dims = new int[argc];
+				for(int i=0;i<argc;i++) {
+					Double d = (Double)environment.getValue(i);
+					dims[i] = d.intValue();
+				}
+				return make(dims, 0);
+			}
+			
+		});
+		model.functions.put("transpose", new Fn1(1) {
+
+			@Override
+			public Object evaluate(IEnvironment environment, int argc) {
+				
+				Array array = (Array)environment.getValue(0);
+				return array.transposed();
+				
+			}
+			
 		});
 		model.functions.put("delay", new Fn1(4) {
 			
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ExecutionException.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ExecutionException.java
new file mode 100644
index 00000000..ebea363e
--- /dev/null
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ExecutionException.java
@@ -0,0 +1,18 @@
+package fi.semantum.sysdyn.solver;
+
+public class ExecutionException extends RuntimeException {
+
+	private static final long serialVersionUID = 8394963990462508948L;
+	
+	public int line = -1;
+	
+	public ExecutionException(String message) {
+		super(message);
+	}
+
+	public ExecutionException(String message, int line) {
+		super(message);
+		this.line = line;
+	}
+
+}
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ForStatement.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ForStatement.java
index 5dedd79e..bd487b19 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ForStatement.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/ForStatement.java
@@ -27,23 +27,28 @@ public class ForStatement implements IStatement {
 		return "for " + indices + " loop "+ statement + " end for";
 	}
 	
-	private void loop(IEnvironment environment, int i) {
+	private ReturnValue loop(IEnvironment environment, int i) {
 		if(i == indices.size()) {
-			statement.evaluate(environment);
-			return;
+			ReturnValue ret = statement.evaluate(environment);
+			if(ReturnValue.BREAK.equals(ret)) return ReturnValue.CONTINUE;
+			else if(ReturnValue.RETURN.equals(ret)) return ReturnValue.RETURN;
+			else return ReturnValue.CONTINUE;
 		} else {
 			ForIndex index = indices.get(i);
 			Array array = (Array)index.expression.evaluate(environment);
 			for(Object element : array.elements()) {
 				environment.put(index.base.index, element);
-				loop(environment, i+1);
+				ReturnValue ret = loop(environment, i+1);
+				if(ReturnValue.BREAK.equals(ret)) return ReturnValue.CONTINUE;
+				else if(ReturnValue.RETURN.equals(ret)) return ReturnValue.RETURN;
 			}
+			return ReturnValue.CONTINUE;
 		}
 	}
 	
 	@Override
-	public void evaluate(IEnvironment environment) {
-		loop(environment, 0);
+	public ReturnValue evaluate(IEnvironment environment) {
+		return loop(environment, 0);
 	}
 	
 }
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Function.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Function.java
index 3c32e6e9..f78c04a6 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Function.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Function.java
@@ -28,10 +28,13 @@ final public class Function implements Fn, IFrame {
 	public Variable[] parameters;
 	
 	public ArrayList<ForIndex> indices = new ArrayList<ForIndex>();
+	
+	public int line;
 
-	public Function(String name, IStatement statement) {
+	public Function(String name, IStatement statement, int line) {
 		this.name = name;
 		this.statement = statement;
+		this.line = line;
 	}
 	
 	public Object evaluate(IEnvironment environment, int argc) {
@@ -48,7 +51,12 @@ final public class Function implements Fn, IFrame {
 		}
 		for(int i=0;i<internals.size();i++) {
 			VariableDeclaration decl = internals.get(i);
-			decl.variable.assignPlain(environment, null);
+			if(decl.modification.args.length == 1) {
+				Object o = decl.modification.args[0].modification.evaluate(environment);
+				decl.variable.assignPlain(environment, o);
+			} else {
+				decl.variable.assignPlain(environment, null);
+			}
 		}
 	}
 	
@@ -106,7 +114,7 @@ final public class Function implements Fn, IFrame {
 	}
 	
 	@Override
-	public Variable[] parameters() {
+	public Variable[] parameters(int argc) {
 		return parameters;
 	}
 	
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/GreaterThan.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/GreaterThan.java
index e91f0ffc..5735e4b6 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/GreaterThan.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/GreaterThan.java
@@ -29,7 +29,9 @@ public class GreaterThan implements IExpression {
     
 	@Override
 	public Object evaluate(IEnvironment environment) {
-		return ((Double)exp1.evaluate(environment)) > ((Double)exp2.evaluate(environment));
+		Object left = exp1.evaluate(environment);
+		Object right = exp2.evaluate(environment);
+		return ((Double)left) > ((Double)right);
 	}
 
 	@Override
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/IStatement.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/IStatement.java
index e50a09bc..efb5472f 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/IStatement.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/IStatement.java
@@ -12,6 +12,10 @@ package fi.semantum.sysdyn.solver;
 
 public interface IStatement {
 
-	public void evaluate(IEnvironment environment);
+	public enum ReturnValue {
+		CONTINUE,BREAK,RETURN;
+	}
+	
+	public ReturnValue evaluate(IEnvironment environment);
 	
 }
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/IfStatement.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/IfStatement.java
index 37dc2af2..8fb020e7 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/IfStatement.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/IfStatement.java
@@ -28,11 +28,11 @@ public class IfStatement implements IStatement {
     }
     
 	@Override
-	public void evaluate(IEnvironment environment) {
+	public ReturnValue evaluate(IEnvironment environment) {
 		if((Boolean)exp.evaluate(environment)) {
-			t.evaluate(environment);
+			return t.evaluate(environment);
 		} else {
-			e.evaluate(environment);
+			return e.evaluate(environment);
 		}
 	}
     
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Model.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Model.java
index e4b1337a..ab861d89 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Model.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Model.java
@@ -13,6 +13,7 @@ package fi.semantum.sysdyn.solver;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
 
@@ -39,6 +40,7 @@ class Model implements IFrame {
 	
 	public final Globals globals;
 	
+	public int line = -1;
 	public String name;
 	public boolean isEnumClass;
 	
@@ -81,6 +83,16 @@ class Model implements IFrame {
 		return base;
 	}
 	
+	private void reportException(Fn fn, ExecutionException e) throws ExecutionException {
+		
+		if(fn instanceof Function) {
+			throw new ExecutionException("function " + name + ": " + (e.line - ((Function)fn).line) + ": " + e.getMessage());
+		} else {
+			throw new ExecutionException("function " + name + ": " + (e.line - ((Function)fn).line) + ": " + e.getMessage());
+		}
+		
+	}
+	
 	public Object evaluateFunction(IEnvironment environment, String name, ArgumentList args) {
 		Fn fn = getFunction(name);
 		if(fn == null) {
@@ -98,7 +110,7 @@ class Model implements IFrame {
 				argh.add(args.args[i].modification.evaluate(environment));
 			}
 			
-			Variable[] parameters = fn.parameters();
+			Variable[] parameters = fn.parameters(argh.size());
 			
 			for(int i=0;i<args.args.length+1;i++) {
 				Variable var = parameters[i];
@@ -108,7 +120,15 @@ class Model implements IFrame {
 
 			fn.setLocals(frame);
 			
-			return fn.evaluate(frame, args.args.length+1);
+			try {
+			
+				return fn.evaluate(frame, args.args.length+1);
+				
+			} catch (ExecutionException e) {
+				
+				reportException(fn, e);
+				
+			}
 			
 		} else {
 			
@@ -121,24 +141,112 @@ class Model implements IFrame {
 				argh.add(arg);
 			}
 			
-			Variable[] parameters = fn.parameters();
+			Variable[] parameters = fn.parameters(args.args.length);
+			Object[] ps = new Object[parameters.length];
+			boolean vector[] = new boolean[parameters.length];
 			
+			int vectorDimension = 0;
+			ArrayList<Array> arrs = new ArrayList<Array>();
 			for(int i=0;i<parameters.length;i++) {
 				Variable var = parameters[i];
 				if(i < argh.size()) {
-					Object value = argh.get(i);
-					var.assignPlain(frame, value);
+					ps[i] = argh.get(i);
 				} else {
-					Object value = fn.evaluateInput(environment, i);
-					var.assignPlain(frame, value);
+					ps[i] = fn.evaluateInput(environment, i);
+				}
+				if(var.base.dimensions == null && ps[i] instanceof Array) {
+					int dim = ((Array)ps[i]).dimension();
+					if(vectorDimension > 0 && dim != vectorDimension) throw new IllegalStateException("Array dimensions do not agree");
+					vectorDimension = dim;
+					vector[i] = true;
+					arrs.add((Array)ps[i]);
+				} else {
+					vector[i] = false;
 				}
 			}
 			
-			fn.setLocals(frame);
-			return fn.evaluate(frame, args.args.length);
+			if(vectorDimension > 0) {
+				
+				return arrayEvaluate(frame, fn, parameters, ps, vector, arrs);
+				
+			} else {
+			
+				for(int i=0;i<parameters.length;i++) {
+					parameters[i].assignPlain(frame, ps[i]);
+				}
+				
+				fn.setLocals(frame);
+				
+				try {
+
+					return fn.evaluate(frame, args.args.length); 
+
+				} catch (ExecutionException e) {
+
+					reportException(fn, e);
+
+				}
+				
+			}
 			
 		}
 			
+		// This cannot happen - reportException always throws
+		throw new IllegalStateException();
+		
+	}
+	
+	private Array arrayEvaluate(Frame frame, Fn fn, Variable[] parameters, Object[] ps, boolean[] vector, List<Array> arrs) {
+		
+		Array result = new Array();
+
+		Array first = arrs.get(0);
+		
+		int d = first.elements().size();
+		if(d == 0) return result;
+
+		Object firstElement = first.element(0);
+		boolean subArray = firstElement instanceof Array;
+		
+		for(int i=0;i<d;i++) {
+
+			int vectorIndex = 0;
+
+			if(subArray) {
+
+				ArrayList<Array> subArrs = new ArrayList<Array>();
+				for(int j=0;j<parameters.length;j++) {
+					if(vector[j]) {
+						Array a = arrs.get(vectorIndex++);
+						Array sub = (Array)a.element(i);
+						subArrs.add(sub);
+					}
+				}
+				
+				result.addElement(arrayEvaluate(frame, fn, parameters, ps, vector, subArrs));
+
+			} else {
+
+				for(int j=0;j<parameters.length;j++) {
+					if(vector[j]) {
+						Array a = arrs.get(vectorIndex++);
+						Object sub = a.element(i);
+						parameters[j].assignPlain(frame, sub);
+					} else {
+						parameters[j].assignPlain(frame, ps[j]);
+					}
+				}
+
+				fn.setLocals(frame);
+				Object ret = fn.evaluate(frame, parameters.length);
+				result.addElement(ret);
+				
+			}
+			
+		}			
+		
+		return result;
+
 	}
 	
 	private VariableBase resolveCopy(Map<String,VariableBase> work, VariableBase target) {
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/MultiStatement.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/MultiStatement.java
index ff330375..f7c5083f 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/MultiStatement.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/MultiStatement.java
@@ -30,12 +30,13 @@ public class MultiStatement implements IStatement {
     }
     
     @Override
-    public void evaluate(IEnvironment environment) {
+    public ReturnValue evaluate(IEnvironment environment) {
     	@SuppressWarnings("unchecked")
     	ArrayList<Object> values = (ArrayList<Object>)environment.getSystem().evaluateFunction(environment, fn.base.name, args);
     	for(int i=0;i<targets.size();i++) {
     		targets.get(i).assignPlain(environment, values.get(i));
     	}
+    	return ReturnValue.CONTINUE;
     }
     
 }
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Multiplication.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Multiplication.java
index e4d29b2c..97791824 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Multiplication.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Multiplication.java
@@ -38,7 +38,13 @@ public class Multiplication implements IExpression {
 		else if(left instanceof Array && right instanceof Array) {
 			Array la = (Array)left;
 			Array ra = (Array)right;
-			return la.mul(ra);
+			if(la.isVector && ra.isVector) {
+				return la.inner(ra);
+			} else if(ra.isVector) {
+				return la.matrixMulVector(ra);
+			} else {
+				return la.matrixMulMatrix(ra);
+			}
 		}
 		else if (left instanceof Array && right instanceof Double) return ((Array)left).mul((Double)right);
 		else if (left instanceof Double && right instanceof Array) return ((Array)right).mul((Double)left);
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Negation.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Negation.java
index 8cdad84e..97959451 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Negation.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Negation.java
@@ -12,6 +12,8 @@ package fi.semantum.sysdyn.solver;
 
 import java.util.Map;
 
+import fi.semantum.sysdyn.solver.Array.Modifier;
+
 public class Negation implements IExpression {
 	
     public IExpression exp;
@@ -27,9 +29,26 @@ public class Negation implements IExpression {
     
 	@Override
 	public Object evaluate(IEnvironment environment) {
-		Double d = (Double)exp.evaluate(environment);
-		if(d == null) return null;
-		return -d;
+		Object value = exp.evaluate(environment);
+		if(value == null) return null;
+		if(value instanceof Double) {
+			return -((Double)value); 
+		} else if(value instanceof Array) {
+			return ((Array)value).copy(new Modifier() {
+
+				@Override
+				public Object modify(Object o) {
+					if(o instanceof Double) {
+						return -((Double)o); 
+					} else {
+						throw new IllegalStateException();
+					}
+				}
+				
+			});
+		} else {
+			throw new IllegalStateException();
+		}
 	}
     
 	@Override
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Parser.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Parser.java
index e2c722d7..32695d74 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Parser.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Parser.java
@@ -74,12 +74,12 @@ public class Parser {
 			IExpression exp = (IExpression)walk((SimpleNode)n.jjtGetChild(1), indent+2, frame);
 			if(v instanceof Derivative) {
 				Derivative der = (Derivative)v;
-				Assignment eq = new Assignment(der.variable, der.variable.subscripts, new Derivate(der.variable, der.variable.subscripts, exp));
+				Assignment eq = new Assignment(model, der.variable, der.variable.subscripts, new Derivate(der.variable, der.variable.subscripts, exp));
 				model.derivatives.add(eq);
 				return eq;
 			} else {
 				Variable var = (Variable)v;
-				Assignment eq = new Assignment(var, var.subscripts, exp);
+				Assignment eq = new Assignment(model, var, var.subscripts, exp);
 				if(model.initial)
 					model.initials.add(eq);
 				else
@@ -153,7 +153,15 @@ public class Parser {
 //					| when_statement() )
 //				comment() 
 			
-			if(n.jjtGetNumChildren() == 1) {
+			if(n.jjtGetNumChildren() == 0) {
+				if("break".equals(n.op)) {
+					return new Break();
+				} else if ("return".equals(n.op)) {
+					return new Return();
+				} else {
+					throw new IllegalStateException();
+				}
+			} else if(n.jjtGetNumChildren() == 1) {
 				return (IStatement)walk((SimpleNode)n.jjtGetChild(0), indent+2, frame);
 			} else if (n.jjtGetNumChildren() == 2) {
 				SimpleNode n0 = (SimpleNode)n.jjtGetChild(1);
@@ -330,18 +338,18 @@ public class Parser {
 			return subs;
 		case declaration:
 			if(n.jjtGetNumChildren() == 0) {
-				return new Declaration(new Variable(frame, n.op, null), null);
+				return new Declaration(new Variable(frame, n.op, null, n.line), null);
 			} else if(n.jjtGetNumChildren() == 1) {
 				Object o = walk((SimpleNode)n.jjtGetChild(0), indent+2, frame);
 				if(o instanceof IExpression[]) {
-					return new Declaration(new Variable(frame, n.op, (IExpression[])o), null);
+					return new Declaration(new Variable(frame, n.op, (IExpression[])o, n.line), null);
 				} else {
-					return new Declaration(new Variable(frame, n.op, null), o);
+					return new Declaration(new Variable(frame, n.op, null, n.line), o);
 				}
 			} else if(n.jjtGetNumChildren() == 2) {
 				IExpression[] subscripts2 = (IExpression[])walk((SimpleNode)n.jjtGetChild(0), indent+2, frame);
 				Object modification = walk((SimpleNode)n.jjtGetChild(1), indent+2, frame);
-				return new Declaration(new Variable(frame, n.op,subscripts2), modification);
+				return new Declaration(new Variable(frame, n.op,subscripts2, n.line), modification);
 			} else {
 				StringBuilder b = new StringBuilder();
 				b.append("declaration: ");
@@ -357,8 +365,9 @@ public class Parser {
 				SimpleNode child = (SimpleNode)n.jjtGetChild(0);
 				String packagePath = getPackagePath(child);
 				String functionName = packagePath + child.op;
+				System.err.println("function " + functionName + " at line " + child.line);
 				ArrayList<IStatement> stms2 = new ArrayList<IStatement>();
-				Function function = new Function(functionName, new StatementList(stms2));
+				Function function = new Function(functionName, new StatementList(stms2), child.line);
 				ArrayList<Object> composition = (ArrayList<Object>)walk(child, indent+2, function);
 				for(int i=1;i<composition.size();i++) {
 					Object comp = composition.get(i);
@@ -376,34 +385,41 @@ public class Parser {
 								ArrayList<Object> os = (ArrayList<Object>)os_;
 								for(Object o : os) {
 									VariableDeclaration decl = (VariableDeclaration)o;
-									function.internals.add(decl);
+									if("input".equals(decl.direction)) function.inputs.add(decl);
+									else if ("output".equals(decl.direction)) function.outputs.add(decl);
+									else function.internals.add(decl);
 								}
 							}
 						}
 					}
 				}
-				ArrayList<Object> declarations = (ArrayList<Object>)composition.get(0);
-				for(Object os_ : declarations) {
-					if(os_ instanceof VariableDeclaration) {
-						VariableDeclaration decl = (VariableDeclaration)os_;
-						if("input".equals(decl.direction)) function.inputs.add(decl);
-						else if ("output".equals(decl.direction)) function.outputs.add(decl);
-						else throw new IllegalStateException();
-					} else {
-						ArrayList<Object> os = (ArrayList<Object>)os_;
-						for(Object o : os) {
-							VariableDeclaration decl = (VariableDeclaration)o;
+				if(!composition.isEmpty()) {
+					ArrayList<Object> declarations = (ArrayList<Object>)composition.get(0);
+					for(Object os_ : declarations) {
+						if(os_ instanceof VariableDeclaration) {
+							VariableDeclaration decl = (VariableDeclaration)os_;
 							if("input".equals(decl.direction)) function.inputs.add(decl);
 							else if ("output".equals(decl.direction)) function.outputs.add(decl);
-							else throw new IllegalStateException();
+							else function.internals.add(decl);
+						} else {
+							ArrayList<Object> os = (ArrayList<Object>)os_;
+							for(Object o : os) {
+								VariableDeclaration decl = (VariableDeclaration)o;
+								if("input".equals(decl.direction)) function.inputs.add(decl);
+								else if ("output".equals(decl.direction)) function.outputs.add(decl);
+								else function.internals.add(decl);
+							}
 						}
 					}
 				}
+				
 				model.functions.put(functionName, function);
 				return function;
 				
 			} else if("model".equals(n.op)) {
 
+				model.line = n.line;
+				
 				if(n.jjtGetNumChildren() == 1) {
 					return walk((SimpleNode)n.jjtGetChild(0), indent+2, frame);
 				} else {
@@ -419,8 +435,8 @@ public class Parser {
 				walk(specifier, indent+2, clazz);
 				
 				if(clazz.isEnumClass) {
-					Variable sizeVariable = new Variable(clazz, "size", null);
-					Variable elementsVariable = new Variable(clazz, "elements", new IExpression[] { new Constant(""+clazz.variables.size()) });
+					Variable sizeVariable = new Variable(clazz, "size", null, n.line);
+					Variable elementsVariable = new Variable(clazz, "elements", new IExpression[] { new Constant(""+clazz.variables.size()) }, n.line);
 					clazz.parameters.add(new ParameterDeclaration(sizeVariable, sizeVariable.getPossibleConstant()));
 					clazz.parameters.add(new ParameterDeclaration(elementsVariable, elementsVariable.getPossibleConstant()));
 				}
@@ -457,12 +473,12 @@ public class Parser {
 			}
 		case component_reference:
 			if(n.jjtGetNumChildren() == 1) {
-				return Variable.make(frame, n.op, (IExpression[])walk((SimpleNode)n.jjtGetChild(0), indent+2, frame));
+				return Variable.make(frame, n.op, (IExpression[])walk((SimpleNode)n.jjtGetChild(0), indent+2, frame), n.line);
 			} else {
 				if ("time".equals(n.op)) {
 					return new TimeVariable();
 				}
-				return Variable.make(frame, n.op, null);
+				return Variable.make(frame, n.op, null, n.line);
 			}
 		case relation:
 			if(n.jjtGetNumChildren() == 3) {
@@ -536,7 +552,9 @@ public class Parser {
 				String op = ((String)walk((SimpleNode)n.jjtGetChild(i), indent+2, model)).trim();
 				IExpression exp2 = (IExpression)walk((SimpleNode)n.jjtGetChild(i+1), indent+2, frame);
 				if("+".equals(op)) left = new Addition(left, exp2);
+				else if(".+".equals(op)) left = new ElementwiseAddition(left, exp2);
 				else if("-".equals(op)) left = new Subtraction(left, exp2);
+				else if(".-".equals(op)) left = new ElementwiseSubtraction(left, exp2);
 			}
 
 			return left;
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Return.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Return.java
new file mode 100644
index 00000000..023ae534
--- /dev/null
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Return.java
@@ -0,0 +1,29 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Semantum Oy.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package fi.semantum.sysdyn.solver;
+
+
+public class Return implements IStatement {
+	
+    public Return() {
+    }
+    
+    @Override
+    public String toString() {
+    	return "return";
+    }
+    
+    @Override
+    public ReturnValue evaluate(IEnvironment environment) {
+    	return ReturnValue.RETURN;
+    }
+    
+}
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Solver.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Solver.java
index 6ea46d57..80484a56 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Solver.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Solver.java
@@ -28,18 +28,18 @@ import fi.semantum.sysdyn.solver.parser.SimpleNode;
 
 public class Solver {
 
+	private static final boolean VALIDATE = true;	
 	private static final boolean PRINT_EXCEPTIONS = false;	
 	private static final int STACK_SIZE = 1000;
+	private static final int MAX_LOOPS = 50;
 
 	private Model model;
 	private Environment env;
 
 	private Object[] newValues;
-	private Object[] derivatives;
 	
 	private double defaultStep;
 	private double start;
-	private NodeCache cache;
 	private boolean ready;
 	
 	private boolean dirty;
@@ -49,7 +49,6 @@ public class Solver {
 		defaultStep = 0.1;
 		start = 0;
 		// is it okay to store the cache with the solver instance?
-		cache = new NodeCache();
 		ready = false;
 	}
 	
@@ -112,6 +111,24 @@ public class Solver {
 	private SimpleNode n;
 	private String codeCache = null;
 	
+	private void validate(Variable var, Object value) {
+		if(VALIDATE) {
+			if(value instanceof Double) {
+				if(Double.isNaN((Double)value)) {
+					System.err.println("value is invalid (NaN): " + var.base.name);
+					throw new IllegalStateException("value is invalid (NaN)");
+				}
+				if(Double.isInfinite((Double)value)) {
+					System.err.println("value is invalid (Infinite): " + var.base.name);
+					throw new IllegalStateException("value is invalid (Infinite)");
+				}
+			}
+			if(value instanceof Array) {
+				for(Object o : ((Array)value).elements()) validate(var, o);
+			}
+		}
+	}
+	
 	public void prepare(String input) throws Exception {
 		
 		long startNanos = System.nanoTime();
@@ -148,13 +165,16 @@ public class Solver {
 		model.parameterArray = model.parameters.toArray(new ParameterDeclaration[model.parameters.size()]);
 		
 		newValues = new Object[Math.max(model.assignments.size(),model.derivatives.size())];
-		derivatives = new Object[model.derivatives.size()];
 		
 		int condition = 1;
 		int loops = 0;
 		
-		while(condition > 0 && loops++ < 50) {
+		StringBuilder errors = null;
+		
+		while(condition > 0 && loops++ < MAX_LOOPS) {
 
+			if(loops == MAX_LOOPS) errors = new StringBuilder();
+			
 			if(PRINT_EXCEPTIONS) {
 				System.err.println("== LOOP " + loops + " ==");
 			}
@@ -164,14 +184,21 @@ public class Solver {
 			for(ParameterDeclaration pd : model.parameters) {
 				try {
 					if(!pd.assigned) {
-						pd.variable.assign(env, null, pd.modification.evaluate(env));
+						Object value = pd.modification.evaluate(env);
+						validate(pd.variable, value);
+						pd.variable.assign(env, null, value);
 						pd.assigned = true;
 					}
 				} catch (Exception e) {
+					String error = "  -" + pd.variable.toString() + ": " + e.getMessage();
+					if(errors != null) {
+						errors.append(error);
+						errors.append("\n");
+					}
 					condition++;
 					if(PRINT_EXCEPTIONS) {
 						e.printStackTrace();
-						System.err.println("failed to assign " + pd.variable.toString());
+						System.err.println(error);
 					}
 				}
 			}
@@ -187,12 +214,16 @@ public class Solver {
 							if(arg.name.endsWith("start")) {
 								Object value = arg.modification.evaluate(env);
 								if(vd.variable.base.dimension() == 1) {
+									validate(vd.variable, value);
 									vd.variable.assign(env, null, value);
 								} else {
+									validate(vd.variable, value);
 									if(value instanceof Double) {
 										Array array = new Array();
 										for(int i=0;i<vd.variable.base.dimension();i++) array.addElement(value);
 										vd.variable.assign(env, null, array);
+									} else if (value instanceof Array) {
+										vd.variable.assign(env, null, value);
 									} else {
 										throw new IllegalStateException();
 									}
@@ -209,33 +240,41 @@ public class Solver {
 						}
 					}
 				} catch (Exception e) {
+					String error = "  -" + vd.variable.toString() + ": " + e.getMessage();
+					if(errors != null) {
+						errors.append(error);
+						errors.append("\n");
+					}
 					condition++;
 					if(PRINT_EXCEPTIONS) {
 						e.printStackTrace();
-						System.err.println("failed to assign " + vd.variable.toString());
+						System.err.println(error);
 					}
 				}
 			}
 			
 			for(Assignment ass : assignments) {
 				try {
-					if(!ass.assigned) {
-						Object value = ass.expression.evaluate(env);
-						if(value != null) {
-							ass.target.assign(env, ass.subscripts, value);
-							ass.assigned = true;
-						}
-					}
+					if(!ass.assigned)
+						ass.assign(env);
 				} catch (Exception e) {
+					String error = "  -" + ass.target.toString() + ": " + e.getMessage();
+					if(errors != null) {
+						errors.append(error);
+						errors.append("\n");
+					}
 					condition++;
 					if(PRINT_EXCEPTIONS) {
 						e.printStackTrace();
-						System.err.println("failed to assign " + ass.target.toString());
+						System.err.println(error);
 					}
 				}
 			}
 		}
 		
+		if(loops == (MAX_LOOPS+1))
+			throw new IllegalStateException("Did not find initial state for model:\n" + errors.toString());
+		
 		for(Assignment ass : model.assignments) {
 			if(ass.expression instanceof Constant)
 				ass.isConstant = true;
@@ -265,44 +304,53 @@ public class Solver {
 
 		if(!started && dirty) {
 			
-			// Solve all algebraic equations
-			Assignment[] assignments = model.assignmentArray;
-			for(int i=0;i<assignments.length;i++) {
-				if(assignments[i].isConstant) continue;
-				Object value = assignments[i].expression.evaluate(env);
-				assignments[i].target.assign(env, assignments[i].subscripts, value);
-			}
-			for(Assignment ass : model.initials) {
-				if(ass.isConstant) continue;
-				Object value = ass.expression.evaluate(env);
-				ass.target.assign(env, ass.subscripts, value);
-			}
-
-			// Solve initial values
-			for(VariableDeclaration vd : model.variables) {
-				try {
-					for(Argument arg : vd.modification.args) {
-						if(arg.name.endsWith("start")) {
-							Object value = arg.modification.evaluate(env);
-							if(vd.variable.base.dimension() == 1) {
-								vd.variable.assign(env, null, value);
-							} else {
-								if(value instanceof Double) {
-									Array array = new Array();
-									for(int i=0;i<vd.variable.base.dimension();i++) array.addElement(value);
-									vd.variable.assign(env, null, array);
+			for(int loop=0;loop<3;loop++) {
+			
+				// Solve all algebraic equations
+				Assignment[] assignments = model.assignmentArray;
+				for(int i=0;i<assignments.length;i++) {
+					if(assignments[i].isConstant) continue;
+					assignments[i].assign(env);
+//					Object value = assignments[i].expression.evaluate(env);
+//					assignments[i].target.assign(env, assignments[i].subscripts, value);
+				}
+				for(Assignment ass : model.initials) {
+					if(ass.isConstant) continue;
+					ass.assign(env);
+//					Object value = ass.expression.evaluate(env);
+//					ass.target.assign(env, ass.subscripts, value);
+				}
+	
+				for(VariableDeclaration vd : model.variables) {
+					try {
+						for(Argument arg : vd.modification.args) {
+							if(arg.name.endsWith("start")) {
+								Object value = arg.modification.evaluate(env);
+								if(vd.variable.base.dimension() == 1) {
+									validate(vd.variable, value);
+									vd.variable.assign(env, null, value);
 								} else {
-									throw new IllegalStateException();
+									validate(vd.variable, value);
+									if(value instanceof Double) {
+										Array array = new Array();
+										for(int i=0;i<vd.variable.base.dimension();i++) array.addElement(value);
+										vd.variable.assign(env, null, array);
+									} else if (value instanceof Array) {
+										vd.variable.assign(env, null, value);
+									} else {
+										throw new IllegalStateException();
+									}
 								}
 							}
 						}
-					}
-				} catch (Exception e) {
-					if(PRINT_EXCEPTIONS) {
-						e.printStackTrace();
-						System.err.println("failed to assign " + vd.variable.toString());
+					} catch (Exception e) {
+						if(PRINT_EXCEPTIONS) {
+							e.printStackTrace();
+							System.err.println("failed to assign " + vd.variable.toString());
+						}
 					}
 				}
+				
 			}
 			
 			dirty = false;
@@ -345,8 +393,9 @@ public class Solver {
 		// Next solve algebraic equations
 		for(int i=0;i<assignments.length;i++) {
 			if(assignments[i].isConstant) continue;
-			Object value = assignments[i].expression.evaluate(env);
-			assignments[i].target.assign(env, assignments[i].subscripts, value);
+			assignments[i].assign(env);
+//			Object value = assignments[i].expression.evaluate(env);
+//			assignments[i].target.assign(env, assignments[i].subscripts, value);
 		}
 
 	}
@@ -363,7 +412,11 @@ public class Solver {
 	}
 	
 	public double getTime() {
-		return env.time;
+		if (env != null) {
+			return env.time;
+		} else {
+			return 0.0;
+		}
 	}
 	
 	public void setValue(String key, double value) {
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Statement.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Statement.java
index a3dcd40f..381192f8 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Statement.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Statement.java
@@ -28,9 +28,10 @@ public class Statement implements IStatement {
     }
     
     @Override
-    public void evaluate(IEnvironment environment) {
+    public ReturnValue evaluate(IEnvironment environment) {
 		Object value = expression.evaluate(environment);
 		target.assign(environment, subscripts, value);
+		return ReturnValue.CONTINUE;
     }
     
 }
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/StatementList.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/StatementList.java
index b8c17f88..a7df2cd3 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/StatementList.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/StatementList.java
@@ -26,8 +26,12 @@ public class StatementList implements IStatement {
     }
     
     @Override
-    public void evaluate(IEnvironment environment) {
-    	for(IStatement stm : statements) stm.evaluate(environment);
+    public ReturnValue evaluate(IEnvironment environment) {
+    	for(IStatement stm : statements) {
+    		ReturnValue ret = stm.evaluate(environment);
+    		if(ReturnValue.RETURN.equals(ret)) return ReturnValue.RETURN;
+    	}
+    	return ReturnValue.CONTINUE;
     }
     
 }
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Subtraction.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Subtraction.java
index 7534d1fb..e908d74d 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Subtraction.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Subtraction.java
@@ -12,6 +12,8 @@ package fi.semantum.sysdyn.solver;
 
 import java.util.Map;
 
+import fi.semantum.sysdyn.solver.Array.Modifier2;
+
 public class Subtraction implements IExpression {
 	
     public IExpression exp1;
@@ -30,10 +32,25 @@ public class Subtraction implements IExpression {
     
 	@Override
 	public Object evaluate(IEnvironment environment) {
-		Double d1 = (Double)exp1.evaluate(environment);
-		Double d2 = (Double)exp2.evaluate(environment);
-		if(d1 == null || d2 == null) return null;
-		return d1-d2;
+		Object o1 = exp1.evaluate(environment);
+		Object o2 = exp2.evaluate(environment);
+		if(o1 == null || o2 == null) return null; 
+		if(o1 instanceof Double && o2 instanceof Double) {
+			return (Double)o1 - (Double)o2;
+		}
+		if(o1 instanceof Array && o2 instanceof Array) {
+			Array la = (Array)o1;
+			Array ra = (Array)o2;
+			return la.copy2(ra, new Modifier2() {
+				
+				@Override
+				public Object modify(Object o1, Object o2) {
+					if(o1 instanceof Double && o2 instanceof Double) return ((Double)o1)-((Double)o2);
+					throw new IllegalStateException("Tried to subtract a non-numerical array");
+				}
+			});
+		}
+		throw new IllegalStateException();
 	}
 	
 	@Override
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Utils.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Utils.java
index 70508e47..d4d4af1b 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Utils.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Utils.java
@@ -17,6 +17,8 @@ public class Utils {
 			return ((Double)value).intValue()-1;
 		} else if (value instanceof Constant) {
 			return getIndex(((Constant)value).value);
+		} else if (value instanceof Array) {
+			return -3;
 		} else {
 			throw new IllegalStateException();
 		}
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Variable.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Variable.java
index 9335f68f..581ccecb 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Variable.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/Variable.java
@@ -19,18 +19,20 @@ public class Variable implements IExpression {
 
 	public VariableBase base;
 	public IExpression[] subscripts = null;
+	public int line = -1;
 	
-	public Variable(IFrame frame, String name, IExpression[] subscripts) {
+	public Variable(IFrame frame, String name, IExpression[] subscripts, int line) {
 		base = frame.getBase(name);
 		this.subscripts = subscripts;
+		this.line = line;
 	}
 	
-	public static Object make(IFrame frame, String name, IExpression[] subscripts) {
+	public static Object make(IFrame frame, String name, IExpression[] subscripts, int line) {
 //		Array enumElements = enumerationElements(frame, name);
 //		if(enumElements != null) return enumElements;
 //		Constant enumSize = enumerationSize(frame, name);
 //		if(enumSize != null) return enumSize;
-		return new Variable(frame, name, subscripts);
+		return new Variable(frame, name, subscripts, line);
 	}
 	
 	public Variable(VariableBase base) {
@@ -119,22 +121,28 @@ public class Variable implements IExpression {
 		env.put(base.index, value);
 	}
 	
+	private int subscriptLength() {
+		if(this.subscripts == null) return 1;
+		return this.subscripts.length;
+	}
+	
 	private void validateSize(IEnvironment env, IExpression[] subscripts, Object value) {
 		
 		if(value == null) return;
 		
-		if(base.isStoredAsArray()) return;
+		if(base.isStoredAsArray(env)) return;
 		
 		int fullDimension = base.dimension();
 		if(fullDimension == 1) {
 			if(!(value instanceof Double)) {
 				Array arr = (Array)value;
-				if(arr.size(0) != 1)
-					throw new IllegalStateException();
+				int arrSize = arr.dimension(); 
+				if(arrSize != 1)
+					throw new ExecutionException("Trying to assign an array into a scalar variable");
 			}
 		} else {
 			if(subscripts == null) {
-				if(base.dimensions.length == this.subscripts.length && value instanceof Double) 
+				if(base.dimensions.length == subscriptLength() && value instanceof Double) 
 					return;
 				if(!(value instanceof Array))
 					throw new IllegalStateException();
@@ -164,13 +172,20 @@ public class Variable implements IExpression {
 		validateSize(env, subscripts, value);
 		
 		if(value instanceof Array) {
-			if(base.isStoredAsArray()) {
-				env.put(base.index(env, subscripts), value);
+			if(base.isStoredAsArray(env)) {
+				if(SolverUtils.isFullSubscript(subscripts)) {
+					env.put(base.index(env, subscripts), value);
+				} else {
+					Array[] indices = SolverUtils.parseSubscripts(env, subscripts);
+					Array current = (Array)env.getValue(base.index);
+					current.applyPartial(indices, (Array)value);
+					env.put(base.index, current);
+				}
 			} else {
 				assignArray(env, base.index(env, subscripts), (Array)value, 0);
 			}
 		} else {
-			if(base.isStoredAsArray()) {
+			if(base.isStoredAsArray(env)) {
 				Object _existing = env.getValue(base.index);
 				Array existing = (Array)_existing;
 				if(existing == null) {
@@ -191,9 +206,17 @@ public class Variable implements IExpression {
 	@Override
 	public Object evaluate(IEnvironment environment) {
 		
-		if(constantIndex == -2) constantIndex = base.getConstantIndex(environment, subscripts);
+		try {
 		
-		return base.evaluate(environment, subscripts, constantIndex);
+			if(constantIndex == -2) constantIndex = base.getConstantIndex(environment, subscripts);
+			
+			return base.evaluate(environment, subscripts, constantIndex);
+			
+		} catch (ExecutionException e) {
+			
+			throw new ExecutionException(base.name + ": " + e.getMessage(), line);
+			
+		}
 		
 	}
 
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/VariableBase.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/VariableBase.java
index 842cb93a..e18fc45d 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/VariableBase.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/VariableBase.java
@@ -80,10 +80,10 @@ public class VariableBase {
 		for(int d : dimensions) result *= d;
 		return result;
 	}
-	public boolean isStoredAsArray() {
+	public boolean isStoredAsArray(IEnvironment env) {
 		if(dimensions == null) return false;
 		for(int d : dimensions) if(d == -1) return true;
-		return false;
+		return (env instanceof Frame);
 	}
 	
 	VariableBase withBase(String prefix) {
@@ -130,10 +130,10 @@ public class VariableBase {
 		return result;
 	}
 	
-	private boolean hasScalarSubscript(IExpression[] subscripts) {
-		if(subscripts == null) return false;
-		else return true;
-	}
+//	private boolean hasScalarSubscript(IExpression[] subscripts) {
+//		if(subscripts == null) return false;
+//		else return true;
+//	}
 	
 	public int intoArray(IEnvironment env, int index, int d, Array target) {
 
@@ -161,7 +161,7 @@ public class VariableBase {
 	
 	public int getConstantIndex(IEnvironment environment, IExpression[] subscripts) {
 
-		if(isStoredAsArray()) {
+		if(isStoredAsArray(environment)) {
 			return -1;
 		} else {
 			
@@ -210,37 +210,42 @@ public class VariableBase {
 			}
 		}
 		
-		if(isStoredAsArray()) {
+		if(isStoredAsArray(environment)) {
 			
-			Array array = (Array)environment.getValue(index);
-			if(hasScalarSubscript(subscripts)) {
-				Object o = getArrayIndex(environment, subscripts, array);
-				if(o instanceof Variable) throw new IllegalStateException();
-				if(o instanceof Array)
-					throw new IllegalStateException();
-				return o;
+			Object value = environment.getValue(index);
+			if(value instanceof Array) {
+				Array array = (Array)value;
+				if(subscripts != null) {
+					return array.subscript(environment, subscripts);
+				}
 			}
-			else return array;
+			return value;
 			
 		} else {
-			
+
 			if(dimension() > 1) {
+
+				Array array = new Array();
+				intoArray(environment, index, 0, array);
 				if(subscripts != null) {
-					
-					Array[] sub = SolverUtils.parseSubscripts(environment, subscripts);
-					if(SolverUtils.isSlice(sub)) {
-						Array arr = new Array();
-						intoArray(environment, index, 0, arr);
-						return arr.slice(sub);
-					} else { 
-						return environment.getValue(index(environment, subscripts));
-					}
-					
-				} else {
-					Array array = new Array();
-					intoArray(environment, index, 0, array);
-					return array;
+					return array.subscript(environment, subscripts);
 				}
+				else return array;
+
+//				if(subscripts != null) {
+//					
+//					Array[] sub = SolverUtils.parseSubscripts(environment, subscripts);
+//					if(SolverUtils.isSlice(sub)) {
+//						Array arr = new Array();
+//						intoArray(environment, index, 0, arr);
+//						return arr.slice(sub);
+//					} else { 
+//						return environment.getValue(index(environment, subscripts));
+//					}
+//					
+//				} else {
+//					return array;
+//				}
 			}
 			
 			Object result = environment.getNamedValue(name);
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/While.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/While.java
index 47e94c86..61af2515 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/While.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/While.java
@@ -26,9 +26,13 @@ public class While implements IStatement {
 	}
 	
 	@Override
-	public void evaluate(IEnvironment environment) {
-		while ((Boolean)expression.evaluate(environment))
-			statement.evaluate(environment);
+	public ReturnValue evaluate(IEnvironment environment) {
+		while ((Boolean)expression.evaluate(environment)) {
+			ReturnValue ret = statement.evaluate(environment);
+			if(ReturnValue.BREAK.equals(ret)) return ReturnValue.CONTINUE;
+			else if(ReturnValue.RETURN.equals(ret)) return ReturnValue.RETURN;
+		}
+		return ReturnValue.CONTINUE;
 	}
 	
 }
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelParser.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelParser.java
index c50c6058..b1101a81 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelParser.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelParser.java
@@ -166,9 +166,9 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
 /*** Class Definition **********************************************/
   final public void class_definition() throws ParseException {
                            /*@bgen(jjtree) class_definition */
-  SimpleNode jjtn000 = new SimpleNode(JJTCLASS_DEFINITION);
-  boolean jjtc000 = true;
-  jjtree.openNodeScope(jjtn000);
+                            SimpleNode jjtn000 = new SimpleNode(JJTCLASS_DEFINITION);
+                            boolean jjtc000 = true;
+                            jjtree.openNodeScope(jjtn000);Token t;
     try {
       switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
       case 30:
@@ -192,8 +192,8 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
                 jjtn000.op = "class";
         break;
       case 7:
-        jj_consume_token(7);
-                                                    jjtn000.op = "model";
+        t = jj_consume_token(7);
+                                                        jjtn000.op = "model"; jjtn000.line = t.beginLine;
         break;
       case 61:
         jj_consume_token(61);
@@ -268,7 +268,7 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     try {
       if (jj_2_1(2)) {
         t = jj_consume_token(IDENT);
-                             jjtn000.op = t.image;
+                             jjtn000.op = t.image; jjtn000.line = t.beginLine;
         string_comment();
         composition();
         jj_consume_token(35);
@@ -1403,7 +1403,7 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     Parameter ret = new Parameter();
     try {
       jj_consume_token(IDENT);
-                  ret.name = new String(token.image); jjtn000.op = token.image;
+                  ret.name = new String(token.image); jjtn000.op = token.image; jjtn000.line = token.beginLine;
       switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
       case 66:
         array_subscripts();
@@ -2193,9 +2193,11 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
         break;
       case 29:
         jj_consume_token(29);
+                            jjtn000.op = "break";
         break;
       case 18:
         jj_consume_token(18);
+                             jjtn000.op = "return";
         break;
       case 31:
         if_statement();
@@ -3600,9 +3602,15 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
         break;
       case 80:
         jj_consume_token(80);
+                                                                 jjtree.closeNodeScope(jjtn000, true);
+                                                                 jjtc000 = false;
+                                                                 jjtn000.op = ".+";
         break;
       case 81:
         jj_consume_token(81);
+                                                                                              jjtree.closeNodeScope(jjtn000, true);
+                                                                                              jjtc000 = false;
+                                                                                              jjtn000.op = ".-";
         break;
       default:
         jj_la1[103] = jj_gen;
@@ -3667,29 +3675,29 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
   jjtree.openNodeScope(jjtn000);
     try {
       switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
-      case 82:
-        jj_consume_token(82);
-          jjtree.closeNodeScope(jjtn000, true);
-          jjtc000 = false;
-          jjtn000.op = "*";
-        break;
-      case 83:
-        jj_consume_token(83);
-                                     jjtree.closeNodeScope(jjtn000, true);
-                                     jjtc000 = false;
-                                     jjtn000.op = "/";
-        break;
       case 84:
         jj_consume_token(84);
-                                                                 jjtree.closeNodeScope(jjtn000, true);
-                                                                 jjtc000 = false;
-                                                                 jjtn000.op = ".*";
+           jjtree.closeNodeScope(jjtn000, true);
+           jjtc000 = false;
+           jjtn000.op = ".*";
         break;
       case 85:
         jj_consume_token(85);
-                                                                                               jjtree.closeNodeScope(jjtn000, true);
-                                                                                               jjtc000 = false;
-                                                                                               jjtn000.op = "./";
+                                         jjtree.closeNodeScope(jjtn000, true);
+                                         jjtc000 = false;
+                                         jjtn000.op = "./";
+        break;
+      case 82:
+        jj_consume_token(82);
+                                                                     jjtree.closeNodeScope(jjtn000, true);
+                                                                     jjtc000 = false;
+                                                                     jjtn000.op = "*";
+        break;
+      case 83:
+        jj_consume_token(83);
+                                                                                                jjtree.closeNodeScope(jjtn000, true);
+                                                                                                jjtc000 = false;
+                                                                                                jjtn000.op = "/";
         break;
       default:
         jj_la1[105] = jj_gen;
@@ -4039,7 +4047,7 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
         ;
       }
       t = jj_consume_token(IDENT);
-                             jjtn000.op = t.image;
+                             jjtn000.op = t.image; jjtn000.line = t.beginLine;
       switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
       case 66:
         array_subscripts();
@@ -4655,11 +4663,16 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     finally { jj_save(9, xla); }
   }
 
+  private boolean jj_3R_136() {
+    if (jj_scan_token(81)) return true;
+    return false;
+  }
+
   private boolean jj_3R_74() {
     if (jj_scan_token(62)) return true;
     Token xsp;
     xsp = jj_scanpos;
-    if (jj_3R_167()) jj_scanpos = xsp;
+    if (jj_3R_169()) jj_scanpos = xsp;
     if (jj_scan_token(63)) return true;
     return false;
   }
@@ -4674,16 +4687,16 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_154() {
+  private boolean jj_3R_156() {
     Token xsp;
     xsp = jj_scanpos;
     if (jj_scan_token(68)) jj_scanpos = xsp;
     if (jj_scan_token(IDENT)) return true;
     xsp = jj_scanpos;
-    if (jj_3R_162()) jj_scanpos = xsp;
+    if (jj_3R_164()) jj_scanpos = xsp;
     while (true) {
       xsp = jj_scanpos;
-      if (jj_3R_163()) { jj_scanpos = xsp; break; }
+      if (jj_3R_165()) { jj_scanpos = xsp; break; }
     }
     return false;
   }
@@ -4694,18 +4707,18 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_160() {
-    if (jj_scan_token(58)) return true;
+  private boolean jj_3R_153() {
+    if (jj_scan_token(82)) return true;
     return false;
   }
 
-  private boolean jj_3R_77() {
-    if (jj_scan_token(68)) return true;
+  private boolean jj_3R_162() {
+    if (jj_scan_token(58)) return true;
     return false;
   }
 
-  private boolean jj_3R_151() {
-    if (jj_scan_token(84)) return true;
+  private boolean jj_3R_77() {
+    if (jj_scan_token(68)) return true;
     return false;
   }
 
@@ -4740,57 +4753,58 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
+  private boolean jj_3R_135() {
+    if (jj_scan_token(80)) return true;
+    return false;
+  }
+
   private boolean jj_3R_124() {
     if (jj_scan_token(74)) return true;
     return false;
   }
 
-  private boolean jj_3R_147() {
-    if (jj_3R_156()) return true;
+  private boolean jj_3R_149() {
+    if (jj_3R_158()) return true;
     return false;
   }
 
-  private boolean jj_3R_165() {
+  private boolean jj_3R_167() {
     if (jj_scan_token(70)) return true;
     return false;
   }
 
-  private boolean jj_3R_146() {
+  private boolean jj_3R_148() {
     if (jj_scan_token(66)) return true;
-    if (jj_3R_155()) return true;
+    if (jj_3R_157()) return true;
     if (jj_scan_token(67)) return true;
     return false;
   }
 
-  private boolean jj_3R_145() {
+  private boolean jj_3R_147() {
     if (jj_scan_token(62)) return true;
     if (jj_3R_47()) return true;
     if (jj_scan_token(63)) return true;
     return false;
   }
 
-  private boolean jj_3R_143() {
-    if (jj_3R_153()) return true;
+  private boolean jj_3R_145() {
+    if (jj_3R_155()) return true;
     return false;
   }
 
-  private boolean jj_3R_158() {
+  private boolean jj_3R_160() {
     if (jj_scan_token(87)) return true;
     return false;
   }
 
-  private boolean jj_3R_144() {
-    if (jj_3R_154()) return true;
+  private boolean jj_3R_146() {
+    if (jj_3R_156()) return true;
     return false;
   }
 
-  private boolean jj_3R_135() {
+  private boolean jj_3R_137() {
     Token xsp;
     xsp = jj_scanpos;
-    if (jj_3R_138()) {
-    jj_scanpos = xsp;
-    if (jj_3R_139()) {
-    jj_scanpos = xsp;
     if (jj_3R_140()) {
     jj_scanpos = xsp;
     if (jj_3R_141()) {
@@ -4807,6 +4821,10 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     jj_scanpos = xsp;
     if (jj_3R_147()) {
     jj_scanpos = xsp;
+    if (jj_3R_148()) {
+    jj_scanpos = xsp;
+    if (jj_3R_149()) {
+    jj_scanpos = xsp;
     if (jj_scan_token(35)) return true;
     }
     }
@@ -4821,33 +4839,33 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_138() {
+  private boolean jj_3R_140() {
     if (jj_scan_token(UNSIGNED_NUMBER)) return true;
     return false;
   }
 
-  private boolean jj_3R_142() {
+  private boolean jj_3R_144() {
     if (jj_scan_token(33)) return true;
     return false;
   }
 
-  private boolean jj_3R_141() {
+  private boolean jj_3R_143() {
     if (jj_scan_token(6)) return true;
     return false;
   }
 
-  private boolean jj_3R_140() {
+  private boolean jj_3R_142() {
     if (jj_scan_token(STRING)) return true;
     return false;
   }
 
-  private boolean jj_3R_139() {
+  private boolean jj_3R_141() {
     if (jj_scan_token(UNSIGNED_INTEGER)) return true;
     return false;
   }
 
-  private boolean jj_3R_150() {
-    if (jj_scan_token(83)) return true;
+  private boolean jj_3R_152() {
+    if (jj_scan_token(85)) return true;
     return false;
   }
 
@@ -4856,30 +4874,30 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_156() {
+  private boolean jj_3R_158() {
     if (jj_scan_token(64)) return true;
-    if (jj_3R_166()) return true;
+    if (jj_3R_168()) return true;
     if (jj_scan_token(65)) return true;
     return false;
   }
 
-  private boolean jj_3R_136() {
-    if (jj_3R_148()) return true;
-    if (jj_3R_135()) return true;
+  private boolean jj_3R_138() {
+    if (jj_3R_150()) return true;
+    if (jj_3R_137()) return true;
     return false;
   }
 
-  private boolean jj_3R_155() {
-    if (jj_3R_164()) return true;
+  private boolean jj_3R_157() {
+    if (jj_3R_166()) return true;
     Token xsp;
     while (true) {
       xsp = jj_scanpos;
-      if (jj_3R_165()) { jj_scanpos = xsp; break; }
+      if (jj_3R_167()) { jj_scanpos = xsp; break; }
     }
     return false;
   }
 
-  private boolean jj_3R_159() {
+  private boolean jj_3R_161() {
     if (jj_3R_60()) return true;
     return false;
   }
@@ -4889,14 +4907,14 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_153() {
+  private boolean jj_3R_155() {
     Token xsp;
     xsp = jj_scanpos;
-    if (jj_3R_159()) {
+    if (jj_3R_161()) {
     jj_scanpos = xsp;
-    if (jj_3R_160()) {
+    if (jj_3R_162()) {
     jj_scanpos = xsp;
-    if (jj_3R_161()) return true;
+    if (jj_3R_163()) return true;
     }
     }
     if (jj_3R_74()) return true;
@@ -4908,31 +4926,31 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_148() {
+  private boolean jj_3R_150() {
     Token xsp;
     xsp = jj_scanpos;
-    if (jj_3R_157()) {
+    if (jj_3R_159()) {
     jj_scanpos = xsp;
-    if (jj_3R_158()) return true;
+    if (jj_3R_160()) return true;
     }
     return false;
   }
 
-  private boolean jj_3R_157() {
+  private boolean jj_3R_159() {
     if (jj_scan_token(86)) return true;
     return false;
   }
 
   private boolean jj_3R_120() {
-    if (jj_3R_135()) return true;
+    if (jj_3R_137()) return true;
     Token xsp;
     xsp = jj_scanpos;
-    if (jj_3R_136()) jj_scanpos = xsp;
+    if (jj_3R_138()) jj_scanpos = xsp;
     return false;
   }
 
   private boolean jj_3R_121() {
-    if (jj_3R_137()) return true;
+    if (jj_3R_139()) return true;
     if (jj_3R_120()) return true;
     return false;
   }
@@ -4949,24 +4967,24 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_137() {
+  private boolean jj_3R_139() {
     Token xsp;
     xsp = jj_scanpos;
-    if (jj_3R_149()) {
+    if (jj_3R_151()) {
     jj_scanpos = xsp;
-    if (jj_3R_150()) {
+    if (jj_3R_152()) {
     jj_scanpos = xsp;
-    if (jj_3R_151()) {
+    if (jj_3R_153()) {
     jj_scanpos = xsp;
-    if (jj_3R_152()) return true;
+    if (jj_3R_154()) return true;
     }
     }
     }
     return false;
   }
 
-  private boolean jj_3R_149() {
-    if (jj_scan_token(82)) return true;
+  private boolean jj_3R_151() {
+    if (jj_scan_token(84)) return true;
     return false;
   }
 
@@ -4997,9 +5015,9 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     jj_scanpos = xsp;
     if (jj_3R_134()) {
     jj_scanpos = xsp;
-    if (jj_scan_token(80)) {
+    if (jj_3R_135()) {
     jj_scanpos = xsp;
-    if (jj_scan_token(81)) return true;
+    if (jj_3R_136()) return true;
     }
     }
     }
@@ -5186,6 +5204,14 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
+  private boolean jj_3R_107() {
+    Token xsp;
+    xsp = jj_scanpos;
+    if (jj_scan_token(50)) jj_scanpos = xsp;
+    if (jj_scan_token(44)) return true;
+    return false;
+  }
+
   private boolean jj_3R_66() {
     if (jj_3R_80()) return true;
     return false;
@@ -5275,14 +5301,6 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_107() {
-    Token xsp;
-    xsp = jj_scanpos;
-    if (jj_scan_token(50)) jj_scanpos = xsp;
-    if (jj_scan_token(44)) return true;
-    return false;
-  }
-
   private boolean jj_3R_84() {
     Token xsp;
     xsp = jj_scanpos;
@@ -5506,6 +5524,12 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
+  private boolean jj_3R_165() {
+    if (jj_scan_token(68)) return true;
+    if (jj_scan_token(IDENT)) return true;
+    return false;
+  }
+
   private boolean jj_3R_58() {
     if (jj_scan_token(IDENT)) return true;
     if (jj_3R_74()) return true;
@@ -5537,7 +5561,7 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_174() {
+  private boolean jj_3R_176() {
     if (jj_3R_47()) return true;
     return false;
   }
@@ -5569,9 +5593,8 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_163() {
-    if (jj_scan_token(68)) return true;
-    if (jj_scan_token(IDENT)) return true;
+  private boolean jj_3R_164() {
+    if (jj_3R_170()) return true;
     return false;
   }
 
@@ -5625,31 +5648,26 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_173() {
+  private boolean jj_3R_175() {
     if (jj_scan_token(69)) return true;
     return false;
   }
 
-  private boolean jj_3R_169() {
+  private boolean jj_3R_171() {
     if (jj_scan_token(71)) return true;
     return false;
   }
 
-  private boolean jj_3R_171() {
+  private boolean jj_3R_173() {
     Token xsp;
     xsp = jj_scanpos;
-    if (jj_3R_173()) {
+    if (jj_3R_175()) {
     jj_scanpos = xsp;
-    if (jj_3R_174()) return true;
+    if (jj_3R_176()) return true;
     }
     return false;
   }
 
-  private boolean jj_3R_162() {
-    if (jj_3R_168()) return true;
-    return false;
-  }
-
   private boolean jj_3R_48() {
     Token xsp;
     xsp = jj_scanpos;
@@ -5665,9 +5683,9 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_168() {
+  private boolean jj_3R_170() {
     if (jj_scan_token(66)) return true;
-    if (jj_3R_171()) return true;
+    if (jj_3R_173()) return true;
     return false;
   }
 
@@ -5676,39 +5694,39 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_164() {
+  private boolean jj_3R_166() {
     if (jj_3R_47()) return true;
     Token xsp;
     while (true) {
       xsp = jj_scanpos;
-      if (jj_3R_169()) { jj_scanpos = xsp; break; }
+      if (jj_3R_171()) { jj_scanpos = xsp; break; }
     }
     return false;
   }
 
-  private boolean jj_3R_175() {
+  private boolean jj_3R_177() {
     if (jj_scan_token(IDENT)) return true;
     if (jj_scan_token(88)) return true;
     return false;
   }
 
-  private boolean jj_3R_161() {
+  private boolean jj_3R_163() {
     if (jj_scan_token(46)) return true;
     return false;
   }
 
-  private boolean jj_3R_172() {
-    if (jj_3R_175()) return true;
+  private boolean jj_3R_154() {
+    if (jj_scan_token(83)) return true;
     return false;
   }
 
-  private boolean jj_3R_152() {
-    if (jj_scan_token(85)) return true;
+  private boolean jj_3R_174() {
+    if (jj_3R_177()) return true;
     return false;
   }
 
-  private boolean jj_3R_170() {
-    if (jj_3R_172()) return true;
+  private boolean jj_3R_172() {
+    if (jj_3R_174()) return true;
     return false;
   }
 
@@ -5720,18 +5738,18 @@ public class ModelParser/*@bgen(jjtree)*/implements ModelParserTreeConstants, Mo
     return false;
   }
 
-  private boolean jj_3R_166() {
+  private boolean jj_3R_168() {
     Token xsp;
     xsp = jj_scanpos;
     if (jj_3_10()) {
     jj_scanpos = xsp;
-    if (jj_3R_170()) return true;
+    if (jj_3R_172()) return true;
     }
     return false;
   }
 
-  private boolean jj_3R_167() {
-    if (jj_3R_166()) return true;
+  private boolean jj_3R_169() {
+    if (jj_3R_168()) return true;
     return false;
   }
 
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelParserTokenManager.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelParserTokenManager.java
index dd082219..1ce5ceba 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelParserTokenManager.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelParserTokenManager.java
@@ -16,23 +16,21 @@ private final int jjStopStringLiteralDfa_0(int pos, long active0, long active1)
    {
       case 0:
          if ((active1 & 0x80000L) != 0L)
-            return 22;
+            return 23;
          if ((active1 & 0xb30010L) != 0L)
-            return 10;
-         if ((active0 & 0x884210842108400L) != 0L)
+            return 11;
+         if ((active0 & 0x377bdef7bdef7bf0L) != 0L || (active1 & 0x180000000L) != 0L)
          {
             jjmatchedKind = 90;
-            return 48;
+            return 49;
          }
-         if ((active0 & 0x377bdef7bdef7bf0L) != 0L || (active1 & 0x180000000L) != 0L)
+         if ((active0 & 0x884210842108400L) != 0L)
          {
             jjmatchedKind = 90;
-            return 2;
+            return 50;
          }
          return -1;
       case 1:
-         if ((active0 & 0x108420080400000L) != 0L)
-            return 2;
          if ((active0 & 0x3ef7bdff7fbffff0L) != 0L || (active1 & 0x180000000L) != 0L)
          {
             if (jjmatchedPos != 1)
@@ -40,22 +38,24 @@ private final int jjStopStringLiteralDfa_0(int pos, long active0, long active1)
                jjmatchedKind = 90;
                jjmatchedPos = 1;
             }
-            return 2;
+            return 49;
          }
+         if ((active0 & 0x108420080400000L) != 0L)
+            return 49;
          return -1;
       case 2:
          if ((active0 & 0x400000800201200L) != 0L)
-            return 2;
+            return 49;
          if ((active0 & 0x3bfffdf77f9fedf0L) != 0L || (active1 & 0x180000000L) != 0L)
          {
             jjmatchedKind = 90;
             jjmatchedPos = 2;
-            return 2;
+            return 49;
          }
          return -1;
       case 3:
          if ((active0 & 0x1000084212118400L) != 0L)
-            return 2;
+            return 49;
          if ((active0 & 0x2bfff5b56d8e69f0L) != 0L || (active1 & 0x180000000L) != 0L)
          {
             if (jjmatchedPos != 3)
@@ -63,32 +63,30 @@ private final int jjStopStringLiteralDfa_0(int pos, long active0, long active1)
                jjmatchedKind = 90;
                jjmatchedPos = 3;
             }
-            return 2;
+            return 49;
          }
          return -1;
       case 4:
-         if ((active0 & 0x1090004290008c0L) != 0L)
-            return 2;
          if ((active0 & 0x2af6f5b1469e6130L) != 0L || (active1 & 0x180000000L) != 0L)
          {
             jjmatchedKind = 90;
             jjmatchedPos = 4;
-            return 2;
+            return 49;
          }
+         if ((active0 & 0x1090004290008c0L) != 0L)
+            return 49;
          return -1;
       case 5:
          if ((active0 & 0x22200011009c0000L) != 0L)
-            return 2;
+            return 49;
          if ((active0 & 0x8d6f5a046026130L) != 0L || (active1 & 0x180000000L) != 0L)
          {
             jjmatchedKind = 90;
             jjmatchedPos = 5;
-            return 2;
+            return 49;
          }
          return -1;
       case 6:
-         if ((active0 & 0x80d0a000000000L) != 0L)
-            return 2;
          if ((active0 & 0x856250046026130L) != 0L || (active1 & 0x180000000L) != 0L)
          {
             if (jjmatchedPos != 6)
@@ -96,10 +94,14 @@ private final int jjStopStringLiteralDfa_0(int pos, long active0, long active1)
                jjmatchedKind = 90;
                jjmatchedPos = 6;
             }
-            return 2;
+            return 49;
          }
+         if ((active0 & 0x80d0a000000000L) != 0L)
+            return 49;
          return -1;
       case 7:
+         if ((active0 & 0x802200006020020L) != 0L || (active1 & 0x180000000L) != 0L)
+            return 49;
          if ((active0 & 0x54150040006110L) != 0L)
          {
             if (jjmatchedPos != 7)
@@ -107,19 +109,17 @@ private final int jjStopStringLiteralDfa_0(int pos, long active0, long active1)
                jjmatchedKind = 90;
                jjmatchedPos = 7;
             }
-            return 2;
+            return 49;
          }
-         if ((active0 & 0x802200006020020L) != 0L || (active1 & 0x180000000L) != 0L)
-            return 2;
          return -1;
       case 8:
          if ((active0 & 0x10140000000110L) != 0L)
-            return 2;
+            return 49;
          if ((active0 & 0x44010040006000L) != 0L)
          {
             jjmatchedKind = 90;
             jjmatchedPos = 8;
-            return 2;
+            return 49;
          }
          return -1;
       case 9:
@@ -127,34 +127,34 @@ private final int jjStopStringLiteralDfa_0(int pos, long active0, long active1)
          {
             jjmatchedKind = 90;
             jjmatchedPos = 9;
-            return 2;
+            return 49;
          }
          if ((active0 & 0x4000000004000L) != 0L)
-            return 2;
+            return 49;
          return -1;
       case 10:
-         if ((active0 & 0x10000002000L) != 0L)
-            return 2;
          if ((active0 & 0x40000040000000L) != 0L)
          {
             jjmatchedKind = 90;
             jjmatchedPos = 10;
-            return 2;
+            return 49;
          }
+         if ((active0 & 0x10000002000L) != 0L)
+            return 49;
          return -1;
       case 11:
          if ((active0 & 0x40000000L) != 0L)
-            return 2;
+            return 49;
          if ((active0 & 0x40000000000000L) != 0L)
          {
             jjmatchedKind = 90;
             jjmatchedPos = 11;
-            return 2;
+            return 49;
          }
          return -1;
       case 12:
          if ((active0 & 0x40000000000000L) != 0L)
-            return 2;
+            return 49;
          return -1;
       default :
          return -1;
@@ -190,7 +190,7 @@ private int jjMoveStringLiteralDfa0_0()
          jjmatchedKind = 68;
          return jjMoveStringLiteralDfa1_0(0x0L, 0xb30000L);
       case 47:
-         return jjStartNfaWithStates_0(0, 83, 22);
+         return jjStartNfaWithStates_0(0, 83, 23);
       case 58:
          jjmatchedKind = 69;
          return jjMoveStringLiteralDfa1_0(0x0L, 0x2000000L);
@@ -300,7 +300,7 @@ private int jjMoveStringLiteralDfa1_0(long active0, long active1)
          return jjMoveStringLiteralDfa2_0(active0, 0x2400000000042100L, active1, 0L);
       case 102:
          if ((active0 & 0x80000000L) != 0L)
-            return jjStartNfaWithStates_0(1, 31, 2);
+            return jjStartNfaWithStates_0(1, 31, 49);
          break;
       case 104:
          return jjMoveStringLiteralDfa2_0(active0, 0x1080010000000L, active1, 0L);
@@ -325,7 +325,7 @@ private int jjMoveStringLiteralDfa1_0(long active0, long active1)
          return jjMoveStringLiteralDfa2_0(active0, 0x200000000000L, active1, 0L);
       case 114:
          if ((active0 & 0x400000L) != 0L)
-            return jjStartNfaWithStates_0(1, 22, 2);
+            return jjStartNfaWithStates_0(1, 22, 49);
          return jjMoveStringLiteralDfa2_0(active0, 0x10000220000000L, active1, 0L);
       case 115:
          return jjMoveStringLiteralDfa2_0(active0, 0x80000L, active1, 0L);
@@ -361,9 +361,9 @@ private int jjMoveStringLiteralDfa2_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa3_0(active0, 0x2000002040000400L, active1, 0L);
       case 100:
          if ((active0 & 0x200L) != 0L)
-            return jjStartNfaWithStates_0(2, 9, 2);
+            return jjStartNfaWithStates_0(2, 9, 49);
          else if ((active0 & 0x800000000L) != 0L)
-            return jjStartNfaWithStates_0(2, 35, 2);
+            return jjStartNfaWithStates_0(2, 35, 49);
          return jjMoveStringLiteralDfa3_0(active0, 0x180L, active1, 0L);
       case 101:
          return jjMoveStringLiteralDfa3_0(active0, 0x80030020000L, active1, 0x180000000L);
@@ -381,15 +381,15 @@ private int jjMoveStringLiteralDfa2_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa3_0(active0, 0x104005000002000L, active1, 0L);
       case 114:
          if ((active0 & 0x200000L) != 0L)
-            return jjStartNfaWithStates_0(2, 21, 2);
+            return jjStartNfaWithStates_0(2, 21, 49);
          else if ((active0 & 0x400000000000000L) != 0L)
-            return jjStartNfaWithStates_0(2, 58, 2);
+            return jjStartNfaWithStates_0(2, 58, 49);
          return jjMoveStringLiteralDfa3_0(active0, 0x840000800000L, active1, 0L);
       case 115:
          return jjMoveStringLiteralDfa3_0(active0, 0x2188020L, active1, 0L);
       case 116:
          if ((active0 & 0x1000L) != 0L)
-            return jjStartNfaWithStates_0(2, 12, 2);
+            return jjStartNfaWithStates_0(2, 12, 49);
          return jjMoveStringLiteralDfa3_0(active0, 0x8a0000108040000L, active1, 0L);
       case 117:
          return jjMoveStringLiteralDfa3_0(active0, 0x210200000000L, active1, 0L);
@@ -420,13 +420,13 @@ private int jjMoveStringLiteralDfa3_0(long old0, long active0, long old1, long a
             jjmatchedPos = 3;
          }
          else if ((active0 & 0x200000000L) != 0L)
-            return jjStartNfaWithStates_0(3, 33, 2);
+            return jjStartNfaWithStates_0(3, 33, 49);
          else if ((active0 & 0x4000000000L) != 0L)
-            return jjStartNfaWithStates_0(3, 38, 2);
+            return jjStartNfaWithStates_0(3, 38, 49);
          return jjMoveStringLiteralDfa4_0(active0, 0x88800000a980180L, active1, 0L);
       case 104:
          if ((active0 & 0x400L) != 0L)
-            return jjStartNfaWithStates_0(3, 10, 2);
+            return jjStartNfaWithStates_0(3, 10, 49);
          return jjMoveStringLiteralDfa4_0(active0, 0x20000000000000L, active1, 0L);
       case 107:
          return jjMoveStringLiteralDfa4_0(active0, 0x2000000000L, active1, 0L);
@@ -436,15 +436,15 @@ private int jjMoveStringLiteralDfa3_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa4_0(active0, 0x10000000000L, active1, 0L);
       case 110:
          if ((active0 & 0x10000000L) != 0L)
-            return jjStartNfaWithStates_0(3, 28, 2);
+            return jjStartNfaWithStates_0(3, 28, 49);
          else if ((active0 & 0x80000000000L) != 0L)
-            return jjStartNfaWithStates_0(3, 43, 2);
+            return jjStartNfaWithStates_0(3, 43, 49);
          return jjMoveStringLiteralDfa4_0(active0, 0x108000000000L, active1, 0L);
       case 111:
          return jjMoveStringLiteralDfa4_0(active0, 0x2000001000004010L, active1, 0L);
       case 112:
          if ((active0 & 0x1000000000000000L) != 0L)
-            return jjStartNfaWithStates_0(3, 60, 2);
+            return jjStartNfaWithStates_0(3, 60, 49);
          return jjMoveStringLiteralDfa4_0(active0, 0x100000000L, active1, 0L);
       case 114:
          return jjMoveStringLiteralDfa4_0(active0, 0x20000L, active1, 0x180000000L);
@@ -456,7 +456,7 @@ private int jjMoveStringLiteralDfa3_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa4_0(active0, 0x100000000040000L, active1, 0L);
       case 119:
          if ((active0 & 0x10000L) != 0L)
-            return jjStartNfaWithStates_0(3, 16, 2);
+            return jjStartNfaWithStates_0(3, 16, 49);
          break;
       default :
          break;
@@ -480,23 +480,23 @@ private int jjMoveStringLiteralDfa4_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa5_0(active0, 0x100L, active1, 0L);
       case 101:
          if ((active0 & 0x40L) != 0L)
-            return jjStartNfaWithStates_0(4, 6, 2);
+            return jjStartNfaWithStates_0(4, 6, 49);
          else if ((active0 & 0x1000000000000L) != 0L)
-            return jjStartNfaWithStates_0(4, 48, 2);
+            return jjStartNfaWithStates_0(4, 48, 49);
          return jjMoveStringLiteralDfa5_0(active0, 0x10118000000000L, active1, 0L);
       case 105:
          return jjMoveStringLiteralDfa5_0(active0, 0x220c00000100000L, active1, 0L);
       case 107:
          if ((active0 & 0x1000000L) != 0L)
-            return jjStartNfaWithStates_0(4, 24, 2);
+            return jjStartNfaWithStates_0(4, 24, 49);
          else if ((active0 & 0x20000000L) != 0L)
-            return jjStartNfaWithStates_0(4, 29, 2);
+            return jjStartNfaWithStates_0(4, 29, 49);
          break;
       case 108:
          if ((active0 & 0x80L) != 0L)
-            return jjStartNfaWithStates_0(4, 7, 2);
+            return jjStartNfaWithStates_0(4, 7, 49);
          else if ((active0 & 0x800L) != 0L)
-            return jjStartNfaWithStates_0(4, 11, 2);
+            return jjStartNfaWithStates_0(4, 11, 49);
          break;
       case 109:
          return jjMoveStringLiteralDfa5_0(active0, 0x40000000000L, active1, 0L);
@@ -506,17 +506,17 @@ private int jjMoveStringLiteralDfa4_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa5_0(active0, 0x40000000L, active1, 0L);
       case 114:
          if ((active0 & 0x8000000L) != 0L)
-            return jjStartNfaWithStates_0(4, 27, 2);
+            return jjStartNfaWithStates_0(4, 27, 49);
          else if ((active0 & 0x8000000000000L) != 0L)
-            return jjStartNfaWithStates_0(4, 51, 2);
+            return jjStartNfaWithStates_0(4, 51, 49);
          return jjMoveStringLiteralDfa5_0(active0, 0x28000010000c0030L, active1, 0L);
       case 115:
          if ((active0 & 0x400000000L) != 0L)
-            return jjStartNfaWithStates_0(4, 34, 2);
+            return jjStartNfaWithStates_0(4, 34, 49);
          break;
       case 116:
          if ((active0 & 0x100000000000000L) != 0L)
-            return jjStartNfaWithStates_0(4, 56, 2);
+            return jjStartNfaWithStates_0(4, 56, 49);
          return jjMoveStringLiteralDfa5_0(active0, 0x42200004004000L, active1, 0L);
       case 117:
          return jjMoveStringLiteralDfa5_0(active0, 0x100000000L, active1, 0L);
@@ -542,17 +542,17 @@ private int jjMoveStringLiteralDfa5_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa6_0(active0, 0x2c00000004000L, active1, 0L);
       case 99:
          if ((active0 & 0x200000000000000L) != 0L)
-            return jjStartNfaWithStates_0(5, 57, 2);
+            return jjStartNfaWithStates_0(5, 57, 49);
          return jjMoveStringLiteralDfa6_0(active0, 0x10108000002000L, active1, 0L);
       case 100:
          if ((active0 & 0x2000000000000000L) != 0L)
-            return jjStartNfaWithStates_0(5, 61, 2);
+            return jjStartNfaWithStates_0(5, 61, 49);
          return jjMoveStringLiteralDfa6_0(active0, 0x84000000000000L, active1, 0L);
       case 101:
          return jjMoveStringLiteralDfa6_0(active0, 0x40000000020L, active1, 0L);
       case 102:
          if ((active0 & 0x100000L) != 0L)
-            return jjStartNfaWithStates_0(5, 20, 2);
+            return jjStartNfaWithStates_0(5, 20, 49);
          break;
       case 103:
          return jjMoveStringLiteralDfa6_0(active0, 0x2000000000L, active1, 0L);
@@ -564,13 +564,13 @@ private int jjMoveStringLiteralDfa5_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa6_0(active0, 0x100L, active1, 0L);
       case 109:
          if ((active0 & 0x800000L) != 0L)
-            return jjStartNfaWithStates_0(5, 23, 2);
+            return jjStartNfaWithStates_0(5, 23, 49);
          break;
       case 110:
          if ((active0 & 0x40000L) != 0L)
-            return jjStartNfaWithStates_0(5, 18, 2);
+            return jjStartNfaWithStates_0(5, 18, 49);
          else if ((active0 & 0x20000000000000L) != 0L)
-            return jjStartNfaWithStates_0(5, 53, 2);
+            return jjStartNfaWithStates_0(5, 53, 49);
          return jjMoveStringLiteralDfa6_0(active0, 0x800000000000000L, active1, 0L);
       case 114:
          return jjMoveStringLiteralDfa6_0(active0, 0x40010000000000L, active1, 0L);
@@ -578,11 +578,11 @@ private int jjMoveStringLiteralDfa5_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa6_0(active0, 0x40000000L, active1, 0L);
       case 116:
          if ((active0 & 0x80000L) != 0L)
-            return jjStartNfaWithStates_0(5, 19, 2);
+            return jjStartNfaWithStates_0(5, 19, 49);
          else if ((active0 & 0x100000000L) != 0L)
-            return jjStartNfaWithStates_0(5, 32, 2);
+            return jjStartNfaWithStates_0(5, 32, 49);
          else if ((active0 & 0x1000000000L) != 0L)
-            return jjStartNfaWithStates_0(5, 36, 2);
+            return jjStartNfaWithStates_0(5, 36, 49);
          return jjMoveStringLiteralDfa6_0(active0, 0x20000L, active1, 0x180000000L);
       default :
          break;
@@ -604,13 +604,13 @@ private int jjMoveStringLiteralDfa6_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa7_0(active0, 0x844010000000100L, active1, 0L);
       case 101:
          if ((active0 & 0x2000000000L) != 0L)
-            return jjStartNfaWithStates_0(6, 37, 2);
+            return jjStartNfaWithStates_0(6, 37, 49);
          return jjMoveStringLiteralDfa7_0(active0, 0x2002000L, active1, 0L);
       case 108:
          if ((active0 & 0x400000000000L) != 0L)
-            return jjStartNfaWithStates_0(6, 46, 2);
+            return jjStartNfaWithStates_0(6, 46, 49);
          else if ((active0 & 0x800000000000L) != 0L)
-            return jjStartNfaWithStates_0(6, 47, 2);
+            return jjStartNfaWithStates_0(6, 47, 49);
          break;
       case 110:
          return jjMoveStringLiteralDfa7_0(active0, 0x2000000000000L, active1, 0L);
@@ -618,7 +618,7 @@ private int jjMoveStringLiteralDfa6_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa7_0(active0, 0x200004020000L, active1, 0x180000000L);
       case 115:
          if ((active0 & 0x80000000000000L) != 0L)
-            return jjStartNfaWithStates_0(6, 55, 2);
+            return jjStartNfaWithStates_0(6, 55, 49);
          break;
       case 116:
          if ((active0 & 0x8000000000L) != 0L)
@@ -651,7 +651,7 @@ private int jjMoveStringLiteralDfa7_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa8_0(active0, 0x4000000000000L, active1, 0L);
       case 101:
          if ((active0 & 0x20L) != 0L)
-            return jjStartNfaWithStates_0(7, 5, 2);
+            return jjStartNfaWithStates_0(7, 5, 49);
          return jjMoveStringLiteralDfa8_0(active0, 0x10040000000000L, active1, 0L);
       case 104:
          return jjMoveStringLiteralDfa8_0(active0, 0x10L, active1, 0L);
@@ -659,15 +659,15 @@ private int jjMoveStringLiteralDfa7_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa8_0(active0, 0x40000000004000L, active1, 0L);
       case 108:
          if ((active0 & 0x800000000000000L) != 0L)
-            return jjStartNfaWithStates_0(7, 59, 2);
+            return jjStartNfaWithStates_0(7, 59, 49);
          return jjMoveStringLiteralDfa8_0(active0, 0x40000000L, active1, 0L);
       case 110:
          if ((active0 & 0x2000000L) != 0L)
-            return jjStartNfaWithStates_0(7, 25, 2);
+            return jjStartNfaWithStates_0(7, 25, 49);
          else if ((active0 & 0x4000000L) != 0L)
-            return jjStartNfaWithStates_0(7, 26, 2);
+            return jjStartNfaWithStates_0(7, 26, 49);
          else if ((active0 & 0x200000000000L) != 0L)
-            return jjStartNfaWithStates_0(7, 45, 2);
+            return jjStartNfaWithStates_0(7, 45, 49);
          break;
       case 111:
          return jjMoveStringLiteralDfa8_0(active0, 0x100000000000L, active1, 0L);
@@ -680,7 +680,7 @@ private int jjMoveStringLiteralDfa7_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa8_0(active0, 0x100L, active1, 0x180000000L);
       case 116:
          if ((active0 & 0x2000000000000L) != 0L)
-            return jjStartNfaWithStates_0(7, 49, 2);
+            return jjStartNfaWithStates_0(7, 49, 49);
          return jjMoveStringLiteralDfa8_0(active0, 0x10000000000L, active1, 0L);
       default :
          break;
@@ -706,11 +706,11 @@ private int jjMoveStringLiteralDfa8_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa9_0(active0, 0x2000L, active1, 0L);
       case 100:
          if ((active0 & 0x10000000000000L) != 0L)
-            return jjStartNfaWithStates_0(8, 52, 2);
+            return jjStartNfaWithStates_0(8, 52, 49);
          break;
       case 101:
          if ((active0 & 0x100L) != 0L)
-            return jjStartNfaWithStates_0(8, 8, 2);
+            return jjStartNfaWithStates_0(8, 8, 49);
          break;
       case 105:
          return jjMoveStringLiteralDfa9_0(active0, 0x10000000000L, active1, 0L);
@@ -718,7 +718,7 @@ private int jjMoveStringLiteralDfa8_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa9_0(active0, 0x4000000000000L, active1, 0L);
       case 109:
          if ((active0 & 0x10L) != 0L)
-            return jjStartNfaWithStates_0(8, 4, 2);
+            return jjStartNfaWithStates_0(8, 4, 49);
          break;
       case 110:
          return jjMoveStringLiteralDfa9_0(active0, 0x40000000000000L, active1, 0L);
@@ -726,9 +726,9 @@ private int jjMoveStringLiteralDfa8_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa9_0(active0, 0x4000L, active1, 0L);
       case 114:
          if ((active0 & 0x40000000000L) != 0L)
-            return jjStartNfaWithStates_0(8, 42, 2);
+            return jjStartNfaWithStates_0(8, 42, 49);
          else if ((active0 & 0x100000000000L) != 0L)
-            return jjStartNfaWithStates_0(8, 44, 2);
+            return jjStartNfaWithStates_0(8, 44, 49);
          break;
       default :
          break;
@@ -748,7 +748,7 @@ private int jjMoveStringLiteralDfa9_0(long old0, long active0, long old1, long a
    {
       case 101:
          if ((active0 & 0x4000000000000L) != 0L)
-            return jjStartNfaWithStates_0(9, 50, 2);
+            return jjStartNfaWithStates_0(9, 50, 49);
          return jjMoveStringLiteralDfa10_0(active0, 0x40000000000000L, active1, 0L);
       case 102:
          return jjMoveStringLiteralDfa10_0(active0, 0L, active1, 0x80000000L);
@@ -756,7 +756,7 @@ private int jjMoveStringLiteralDfa9_0(long old0, long active0, long old1, long a
          return jjMoveStringLiteralDfa10_0(active0, 0x2000L, active1, 0L);
       case 110:
          if ((active0 & 0x4000L) != 0L)
-            return jjStartNfaWithStates_0(9, 14, 2);
+            return jjStartNfaWithStates_0(9, 14, 49);
          break;
       case 111:
          return jjMoveStringLiteralDfa10_0(active0, 0x10000000000L, active1, 0L);
@@ -784,11 +784,11 @@ private int jjMoveStringLiteralDfa10_0(long old0, long active0, long old1, long
          return jjMoveStringLiteralDfa11_0(active0, 0x40000000000000L, active1, 0L);
       case 101:
          if ((active0 & 0x2000L) != 0L)
-            return jjStartNfaWithStates_0(10, 13, 2);
+            return jjStartNfaWithStates_0(10, 13, 49);
          return jjMoveStringLiteralDfa11_0(active0, 0x40000000L, active1, 0x100000000L);
       case 110:
          if ((active0 & 0x10000000000L) != 0L)
-            return jjStartNfaWithStates_0(10, 40, 2);
+            return jjStartNfaWithStates_0(10, 40, 49);
          break;
       case 117:
          return jjMoveStringLiteralDfa11_0(active0, 0L, active1, 0x80000000L);
@@ -814,7 +814,7 @@ private int jjMoveStringLiteralDfa11_0(long old0, long active0, long old1, long
          return jjMoveStringLiteralDfa12_0(active0, 0L, active1, 0x100000000L);
       case 100:
          if ((active0 & 0x40000000L) != 0L)
-            return jjStartNfaWithStates_0(11, 30, 2);
+            return jjStartNfaWithStates_0(11, 30, 49);
          break;
       case 110:
          return jjMoveStringLiteralDfa12_0(active0, 0L, active1, 0x80000000L);
@@ -840,7 +840,7 @@ private int jjMoveStringLiteralDfa12_0(long old0, long active0, long old1, long
          return jjMoveStringLiteralDfa13_0(active0, 0L, active1, 0x100000000L);
       case 121:
          if ((active0 & 0x40000000000000L) != 0L)
-            return jjStartNfaWithStates_0(12, 54, 2);
+            return jjStartNfaWithStates_0(12, 54, 49);
          break;
       default :
          break;
@@ -941,7 +941,7 @@ static final long[] jjbitVec0 = {
 private int jjMoveNfa_0(int startState, int curPos)
 {
    int startsAt = 0;
-   jjnewStateCnt = 48;
+   jjnewStateCnt = 49;
    int i = 1;
    jjstateSet[0] = startState;
    int kind = 0x7fffffff;
@@ -956,12 +956,32 @@ private int jjMoveNfa_0(int startState, int curPos)
          {
             switch(jjstateSet[--i])
             {
+               case 23:
+                  if (curChar == 47)
+                  {
+                     if (kind > 3)
+                        kind = 3;
+                     jjCheckNAdd(30);
+                  }
+                  else if (curChar == 42)
+                     jjCheckNAddStates(0, 2);
+                  break;
+               case 49:
+                  if ((0x3ff000000000000L & l) != 0L)
+                  {
+                     if (kind > 90)
+                        kind = 90;
+                     jjCheckNAddTwoStates(2, 3);
+                  }
+                  else if (curChar == 46)
+                     jjCheckNAdd(2);
+                  break;
                case 0:
                   if ((0x3ff000000000000L & l) != 0L)
                   {
                      if (kind > 93)
                         kind = 93;
-                     jjCheckNAddStates(0, 6);
+                     jjCheckNAddStates(3, 9);
                   }
                   else if ((0x100002600L & l) != 0L)
                   {
@@ -969,18 +989,18 @@ private int jjMoveNfa_0(int startState, int curPos)
                         kind = 1;
                   }
                   else if (curChar == 47)
-                     jjAddStates(7, 8);
+                     jjAddStates(10, 11);
                   else if (curChar == 46)
-                     jjCheckNAdd(10);
+                     jjCheckNAdd(11);
                   else if (curChar == 34)
-                     jjCheckNAddStates(9, 11);
+                     jjCheckNAddStates(12, 14);
                   break;
-               case 48:
-                  if ((0x3ff400000000000L & l) != 0L)
+               case 50:
+                  if ((0x3ff000000000000L & l) != 0L)
                   {
                      if (kind > 90)
                         kind = 90;
-                     jjCheckNAdd(2);
+                     jjCheckNAddTwoStates(2, 3);
                   }
                   else if (curChar == 43)
                   {
@@ -992,177 +1012,173 @@ private int jjMoveNfa_0(int startState, int curPos)
                      if (kind > 92)
                         kind = 92;
                   }
-                  break;
-               case 22:
-                  if (curChar == 47)
-                  {
-                     if (kind > 3)
-                        kind = 3;
-                     jjCheckNAdd(29);
-                  }
-                  else if (curChar == 42)
-                     jjCheckNAddStates(12, 14);
+                  else if (curChar == 46)
+                     jjCheckNAdd(2);
                   break;
                case 2:
-                  if ((0x3ff400000000000L & l) == 0L)
+                  if ((0x3ff000000000000L & l) == 0L)
                      break;
                   if (kind > 90)
                      kind = 90;
-                  jjCheckNAdd(2);
+                  jjCheckNAddTwoStates(2, 3);
                   break;
                case 3:
-                  if (curChar == 34)
-                     jjCheckNAddStates(9, 11);
+                  if (curChar == 46)
+                     jjCheckNAdd(2);
                   break;
                case 4:
+                  if (curChar == 34)
+                     jjCheckNAddStates(12, 14);
+                  break;
+               case 5:
                   if ((0xfffffffbfffffbffL & l) != 0L)
-                     jjCheckNAddStates(9, 11);
+                     jjCheckNAddStates(12, 14);
                   break;
-               case 6:
+               case 7:
                   if ((0xfffffffffffffbffL & l) != 0L)
-                     jjCheckNAddStates(9, 11);
+                     jjCheckNAddStates(12, 14);
                   break;
-               case 7:
+               case 8:
                   if (curChar == 34 && kind > 91)
                      kind = 91;
                   break;
-               case 9:
+               case 10:
                   if (curChar == 46)
-                     jjCheckNAdd(10);
+                     jjCheckNAdd(11);
                   break;
-               case 10:
+               case 11:
                   if ((0x3ff000000000000L & l) == 0L)
                      break;
                   if (kind > 94)
                      kind = 94;
                   jjCheckNAddStates(15, 18);
                   break;
-               case 12:
+               case 13:
                   if ((0x3ff000000000000L & l) == 0L)
                      break;
                   if (kind > 94)
                      kind = 94;
-                  jjCheckNAdd(12);
+                  jjCheckNAdd(13);
                   break;
-               case 14:
+               case 15:
                   if (curChar == 45)
-                     jjCheckNAdd(12);
+                     jjCheckNAdd(13);
                   break;
-               case 15:
+               case 16:
                   if (curChar == 43)
-                     jjCheckNAdd(12);
+                     jjCheckNAdd(13);
                   break;
-               case 18:
+               case 19:
                   if (curChar == 45 && kind > 92)
                      kind = 92;
                   break;
-               case 19:
+               case 20:
                   if (curChar == 43 && kind > 92)
                      kind = 92;
                   break;
-               case 21:
+               case 22:
                   if (curChar == 47)
-                     jjAddStates(7, 8);
+                     jjAddStates(10, 11);
                   break;
-               case 23:
+               case 24:
                   if ((0xfffffbffffffffffL & l) != 0L)
-                     jjCheckNAddStates(12, 14);
+                     jjCheckNAddStates(0, 2);
                   break;
-               case 24:
+               case 25:
                   if (curChar == 42)
-                     jjstateSet[jjnewStateCnt++] = 25;
+                     jjstateSet[jjnewStateCnt++] = 26;
                   break;
-               case 25:
+               case 26:
                   if ((0xffff7fffffffffffL & l) != 0L)
-                     jjCheckNAddStates(12, 14);
+                     jjCheckNAddStates(0, 2);
                   break;
-               case 26:
+               case 27:
                   if (curChar == 47 && kind > 2)
                      kind = 2;
                   break;
-               case 27:
+               case 28:
                   if (curChar == 42)
-                     jjstateSet[jjnewStateCnt++] = 26;
+                     jjstateSet[jjnewStateCnt++] = 27;
                   break;
-               case 28:
+               case 29:
                   if (curChar != 47)
                      break;
                   if (kind > 3)
                      kind = 3;
-                  jjCheckNAdd(29);
+                  jjCheckNAdd(30);
                   break;
-               case 29:
+               case 30:
                   if ((0xfffffffffffffbffL & l) == 0L)
                      break;
                   if (kind > 3)
                      kind = 3;
-                  jjCheckNAdd(29);
+                  jjCheckNAdd(30);
                   break;
-               case 30:
+               case 31:
                   if ((0x3ff000000000000L & l) == 0L)
                      break;
                   if (kind > 93)
                      kind = 93;
-                  jjCheckNAddStates(0, 6);
+                  jjCheckNAddStates(3, 9);
                   break;
-               case 31:
+               case 32:
                   if ((0x3ff000000000000L & l) == 0L)
                      break;
                   if (kind > 93)
                      kind = 93;
-                  jjCheckNAdd(31);
+                  jjCheckNAdd(32);
                   break;
-               case 32:
+               case 33:
                   if ((0x3ff000000000000L & l) != 0L)
-                     jjCheckNAddTwoStates(32, 33);
+                     jjCheckNAddTwoStates(33, 34);
                   break;
-               case 33:
+               case 34:
                   if (curChar != 46)
                      break;
                   if (kind > 94)
                      kind = 94;
                   jjCheckNAddStates(19, 22);
                   break;
-               case 34:
+               case 35:
                   if ((0x3ff000000000000L & l) == 0L)
                      break;
                   if (kind > 94)
                      kind = 94;
                   jjCheckNAddStates(19, 22);
                   break;
-               case 36:
+               case 37:
                   if ((0x3ff000000000000L & l) == 0L)
                      break;
                   if (kind > 94)
                      kind = 94;
-                  jjCheckNAdd(36);
+                  jjCheckNAdd(37);
                   break;
-               case 38:
+               case 39:
                   if (curChar == 45)
-                     jjCheckNAdd(36);
+                     jjCheckNAdd(37);
                   break;
-               case 39:
+               case 40:
                   if (curChar == 43)
-                     jjCheckNAdd(36);
+                     jjCheckNAdd(37);
                   break;
-               case 41:
+               case 42:
                   if ((0x3ff000000000000L & l) != 0L)
                      jjCheckNAddStates(23, 26);
                   break;
-               case 43:
+               case 44:
                   if ((0x3ff000000000000L & l) == 0L)
                      break;
                   if (kind > 94)
                      kind = 94;
-                  jjCheckNAdd(43);
+                  jjCheckNAdd(44);
                   break;
-               case 45:
+               case 46:
                   if (curChar == 45)
-                     jjCheckNAdd(43);
+                     jjCheckNAdd(44);
                   break;
-               case 46:
+               case 47:
                   if (curChar == 43)
-                     jjCheckNAdd(43);
+                     jjCheckNAdd(44);
                   break;
                default : break;
             }
@@ -1175,12 +1191,20 @@ private int jjMoveNfa_0(int startState, int curPos)
          {
             switch(jjstateSet[--i])
             {
+               case 49:
+               case 2:
+                  if ((0x7fffffe87fffffeL & l) == 0L)
+                     break;
+                  if (kind > 90)
+                     kind = 90;
+                  jjCheckNAddTwoStates(2, 3);
+                  break;
                case 0:
                   if ((0x7fffffe87fffffeL & l) != 0L)
                   {
                      if (kind > 90)
                         kind = 90;
-                     jjCheckNAdd(2);
+                     jjCheckNAddTwoStates(2, 3);
                   }
                   if ((0x2000000020L & l) != 0L)
                   {
@@ -1188,92 +1212,91 @@ private int jjMoveNfa_0(int startState, int curPos)
                         kind = 92;
                   }
                   if (curChar == 69)
-                     jjCheckNAddTwoStates(18, 19);
+                     jjCheckNAddTwoStates(19, 20);
                   else if (curChar == 101)
-                     jjCheckNAddTwoStates(18, 19);
+                     jjCheckNAddTwoStates(19, 20);
                   break;
-               case 48:
-               case 2:
+               case 50:
                   if ((0x7fffffe87fffffeL & l) == 0L)
                      break;
                   if (kind > 90)
                      kind = 90;
-                  jjCheckNAdd(2);
+                  jjCheckNAddTwoStates(2, 3);
                   break;
                case 1:
                   if ((0x7fffffe87fffffeL & l) == 0L)
                      break;
                   if (kind > 90)
                      kind = 90;
-                  jjCheckNAdd(2);
+                  jjCheckNAddTwoStates(2, 3);
                   break;
-               case 4:
+               case 5:
                   if ((0xffffffffefffffffL & l) != 0L)
-                     jjCheckNAddStates(9, 11);
+                     jjCheckNAddStates(12, 14);
                   break;
-               case 5:
+               case 6:
                   if (curChar == 92)
-                     jjstateSet[jjnewStateCnt++] = 6;
+                     jjstateSet[jjnewStateCnt++] = 7;
                   break;
-               case 6:
-                  jjCheckNAddStates(9, 11);
+               case 7:
+                  jjCheckNAddStates(12, 14);
                   break;
-               case 8:
+               case 9:
                   if ((0x2000000020L & l) != 0L && kind > 92)
                      kind = 92;
                   break;
-               case 11:
+               case 12:
                   if ((0x2000000020L & l) != 0L)
-                     jjstateSet[jjnewStateCnt++] = 12;
+                     jjstateSet[jjnewStateCnt++] = 13;
                   break;
-               case 13:
+               case 14:
                   if (curChar == 101)
-                     jjCheckNAddTwoStates(14, 15);
+                     jjCheckNAddTwoStates(15, 16);
                   break;
-               case 16:
+               case 17:
                   if (curChar == 69)
-                     jjCheckNAddTwoStates(14, 15);
+                     jjCheckNAddTwoStates(15, 16);
                   break;
-               case 17:
+               case 18:
                   if (curChar == 101)
-                     jjCheckNAddTwoStates(18, 19);
+                     jjCheckNAddTwoStates(19, 20);
                   break;
-               case 20:
+               case 21:
                   if (curChar == 69)
-                     jjCheckNAddTwoStates(18, 19);
+                     jjCheckNAddTwoStates(19, 20);
                   break;
-               case 23:
-               case 25:
-                  jjCheckNAddStates(12, 14);
+               case 24:
+               case 26:
+                  jjCheckNAddStates(0, 2);
                   break;
-               case 29:
+               case 30:
                   if (kind > 3)
                      kind = 3;
-                  jjstateSet[jjnewStateCnt++] = 29;
+                  jjstateSet[jjnewStateCnt++] = 30;
                   break;
-               case 35:
+               case 36:
                   if ((0x2000000020L & l) != 0L)
-                     jjstateSet[jjnewStateCnt++] = 36;
+                     jjstateSet[jjnewStateCnt++] = 37;
                   break;
-               case 37:
+               case 38:
                   if (curChar == 101)
-                     jjCheckNAddTwoStates(38, 39);
+                     jjCheckNAddTwoStates(39, 40);
                   break;
-               case 40:
+               case 41:
                   if (curChar == 69)
-                     jjCheckNAddTwoStates(38, 39);
+                     jjCheckNAddTwoStates(39, 40);
                   break;
-               case 42:
+               case 43:
                   if ((0x2000000020L & l) != 0L)
-                     jjstateSet[jjnewStateCnt++] = 43;
+                     jjstateSet[jjnewStateCnt++] = 44;
                   break;
-               case 44:
+               case 45:
                   if (curChar == 101)
-                     jjCheckNAddTwoStates(45, 46);
+                     jjCheckNAddTwoStates(46, 47);
                   break;
-               case 47:
+               case 48:
                   if (curChar == 69)
-                     jjCheckNAddTwoStates(45, 46);
+                     jjCheckNAddTwoStates(46, 47);
                   break;
                default : break;
             }
@@ -1287,22 +1310,22 @@ private int jjMoveNfa_0(int startState, int curPos)
          {
             switch(jjstateSet[--i])
             {
-               case 4:
-               case 6:
+               case 5:
+               case 7:
                   if ((jjbitVec0[i2] & l2) != 0L)
-                     jjCheckNAddStates(9, 11);
+                     jjCheckNAddStates(12, 14);
                   break;
-               case 23:
-               case 25:
+               case 24:
+               case 26:
                   if ((jjbitVec0[i2] & l2) != 0L)
-                     jjCheckNAddStates(12, 14);
+                     jjCheckNAddStates(0, 2);
                   break;
-               case 29:
+               case 30:
                   if ((jjbitVec0[i2] & l2) == 0L)
                      break;
                   if (kind > 3)
                      kind = 3;
-                  jjstateSet[jjnewStateCnt++] = 29;
+                  jjstateSet[jjnewStateCnt++] = 30;
                   break;
                default : break;
             }
@@ -1315,15 +1338,15 @@ private int jjMoveNfa_0(int startState, int curPos)
          kind = 0x7fffffff;
       }
       ++curPos;
-      if ((i = jjnewStateCnt) == (startsAt = 48 - (jjnewStateCnt = startsAt)))
+      if ((i = jjnewStateCnt) == (startsAt = 49 - (jjnewStateCnt = startsAt)))
          return curPos;
       try { curChar = input_stream.readChar(); }
       catch(java.io.IOException e) { return curPos; }
    }
 }
 static final int[] jjnextStates = {
-   31, 32, 33, 41, 42, 44, 47, 22, 28, 4, 5, 7, 23, 24, 27, 10, 
-   11, 13, 16, 34, 35, 37, 40, 41, 42, 44, 47, 
+   24, 25, 28, 32, 33, 34, 42, 43, 45, 48, 23, 29, 5, 6, 8, 11, 
+   12, 14, 17, 35, 36, 38, 41, 42, 43, 45, 48, 
 };
 
 /** Token literal values. */
@@ -1362,8 +1385,8 @@ static final long[] jjtoSkip = {
    0xeL, 0x0L, 
 };
 protected SimpleCharStream input_stream;
-private final int[] jjrounds = new int[48];
-private final int[] jjstateSet = new int[96];
+private final int[] jjrounds = new int[49];
+private final int[] jjstateSet = new int[98];
 private final StringBuilder jjimage = new StringBuilder();
 private StringBuilder image = jjimage;
 private int jjimageLen;
@@ -1394,7 +1417,7 @@ private void ReInitRounds()
 {
    int i;
    jjround = 0x80000001;
-   for (i = 48; i-- > 0;)
+   for (i = 49; i-- > 0;)
       jjrounds[i] = 0x80000000;
 }
 
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelicaParser.jj b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelicaParser.jj
index 6c8fb791..d5f57adb 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelicaParser.jj
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelicaParser.jj
@@ -75,7 +75,7 @@ TOKEN:
 | "*" | "/" | ".*" | "./"
 | "^" | ".^"
 | "=" | ":=" 
-| <IDENT: ["a"-"z","A"-"Z","_"] (["a"-"z","A"-"Z","_",".", "0"-"9"])* >
+| <IDENT: ["a"-"z","A"-"Z","_"] (["a"-"z","A"-"Z","_","0"-"9"] | "." ["a"-"z","A"-"Z","_","0"-"9"])* >
 | <STRING: "\"" (~["\"", "\\", "\n"] | "\\" ~["\n"])* "\"">
     { matchedToken.image = matchedToken.image.substring(1,matchedToken.image.length()-1); }
 | <EXP: "e" | "e-" | "E" | "E-" | "E+" | "e+" >
@@ -177,10 +177,10 @@ Node stored_definition()         : {/*@bgen(jjtree) STORED */
 /*** Class Definition **********************************************/
   
 void class_definition() : {/*@bgen(jjtree) class_definition */
-  SimpleNode jjtn000 = new SimpleNode(JJTCLASS_DEFINITION);
-  boolean jjtc000 = true;
-  jjtree.openNodeScope(jjtn000);
-/*@egen*/
+                            SimpleNode jjtn000 = new SimpleNode(JJTCLASS_DEFINITION);
+                            boolean jjtc000 = true;
+                            jjtree.openNodeScope(jjtn000);
+/*@egen*/ Token t;
 } {/*@bgen(jjtree) class_definition */
     try {
 /*@egen*/
@@ -192,7 +192,7 @@ void class_definition() : {/*@bgen(jjtree) class_definition */
 //  class_specifier
     ( "encapsulated" )?
     ( "partial" )?
-    ( "class" { jjtn000.op = "class"; } | "model" { jjtn000.op = "model"; } | "record" | "block" | ( "expandable" )? "connector" | "type" |
+    ( "class" { jjtn000.op = "class"; } | t = "model" { jjtn000.op = "model"; jjtn000.line = t.beginLine; } | "record" | "block" | ( "expandable" )? "connector" | "type" |
     "package" { jjtn000.op = "package"; } | "function" { jjtn000.op = "function"; } | "operator" | "operator function" | "operator record" )
     class_specifier()/*@bgen(jjtree)*/
     } catch (Throwable jjte000) {
@@ -234,7 +234,7 @@ void class_specifier() : {/*@bgen(jjtree) class_specifier */
 //  | IDENT "=" der "(" name "," IDENT { "," IDENT } ")" comment
 //  | extends IDENT [ class_modification ] string_comment composition
 //  end IDENT  
-    LOOKAHEAD(2) t=<IDENT> { jjtn000.op = t.image; } string_comment() composition() "end" <IDENT>
+    LOOKAHEAD(2) t=<IDENT> { jjtn000.op = t.image; jjtn000.line = t.beginLine; } string_comment() composition() "end" <IDENT>
     | LOOKAHEAD(2) <IDENT> "=" base_prefix() name() ( array_subscripts() )? ( class_modification() )? comment()
     | LOOKAHEAD(3)  <IDENT> "=" "der" "(" name() "," <IDENT> ( "," <IDENT> )* ")" comment()
     | LOOKAHEAD(3) <IDENT> "=" "enumeration" "(" ( ( enum_list() )? | ":" ) ")" comment()/*@bgen(jjtree)*/
@@ -924,7 +924,7 @@ Parameter declaration() : {/*@bgen(jjtree) declaration */
         try {
 /*@egen*/
 //	IDENT [ array_subscripts ] [ modification ]
-	<IDENT>	{ ret.name = new String(token.image); jjtn000.op = token.image; }
+	<IDENT>	{ ret.name = new String(token.image); jjtn000.op = token.image; jjtn000.line = token.beginLine; }
 	( array_subscripts() )?
 	( ret.optional = modification() )?/*@bgen(jjtree)*/
         {
@@ -1454,8 +1454,8 @@ void statement() : {/*@bgen(jjtree) statement */
 //	comment
 	( component_reference() ( ":=" expression() | function_call_args() )
 		| "(" output_expression_list() ")" ":=" component_reference() function_call_args()
-		| "break"
-		| "return"
+		| "break" { jjtn000.op = "break";}
+		| "return" { jjtn000.op = "return";}
 		| if_statement()
 		| for_statement()
 		| while_statement()
@@ -2300,7 +2300,17 @@ void add_op() : {/*@bgen(jjtree) add_op */
                                      jjtree.closeNodeScope(jjtn000, true);
                                      jjtc000 = false;
                                    }
-/*@egen*/ { jjtn000.op = "-";} | ".+" | ".-"/*@bgen(jjtree)*/
+/*@egen*/ { jjtn000.op = "-";} | ".+"/*@bgen(jjtree)*/
+                                                               {
+                                                                 jjtree.closeNodeScope(jjtn000, true);
+                                                                 jjtc000 = false;
+                                                               }
+/*@egen*/ { jjtn000.op = ".+";} | ".-"/*@bgen(jjtree)*/
+                                                                                            {
+                                                                                              jjtree.closeNodeScope(jjtn000, true);
+                                                                                              jjtc000 = false;
+                                                                                            }
+/*@egen*/ { jjtn000.op = ".-";}/*@bgen(jjtree)*/
     } finally {
       if (jjtc000) {
         jjtree.closeNodeScope(jjtn000, true);
@@ -2349,33 +2359,33 @@ void mul_op() : {/*@bgen(jjtree) mul_op */
 } {/*@bgen(jjtree) mul_op */
     try {
 /*@egen*/
-    "*"/*@bgen(jjtree)*/
-        {
-          jjtree.closeNodeScope(jjtn000, true);
-          jjtc000 = false;
-        }
-/*@egen*/ { jjtn000.op = "*";} | "/"/*@bgen(jjtree)*/
-                                   {
-                                     jjtree.closeNodeScope(jjtn000, true);
-                                     jjtc000 = false;
-                                   }
-/*@egen*/ { jjtn000.op = "/";} | ".*"/*@bgen(jjtree)*/
-                                                               {
-                                                                 jjtree.closeNodeScope(jjtn000, true);
-                                                                 jjtc000 = false;
-                                                               }
+    ".*"/*@bgen(jjtree)*/
+         {
+           jjtree.closeNodeScope(jjtn000, true);
+           jjtc000 = false;
+         }
 /*@egen*/ { jjtn000.op = ".*";} | "./"/*@bgen(jjtree)*/
-                                                                                             {
-                                                                                               jjtree.closeNodeScope(jjtn000, true);
-                                                                                               jjtc000 = false;
-                                                                                             }
-/*@egen*/  { jjtn000.op = "./";}/*@bgen(jjtree)*/
+                                       {
+                                         jjtree.closeNodeScope(jjtn000, true);
+                                         jjtc000 = false;
+                                       }
+/*@egen*/  { jjtn000.op = "./";} | "*"/*@bgen(jjtree)*/
+                                                                   {
+                                                                     jjtree.closeNodeScope(jjtn000, true);
+                                                                     jjtc000 = false;
+                                                                   }
+/*@egen*/ { jjtn000.op = "*";} | "/"/*@bgen(jjtree)*/
+                                                                                              {
+                                                                                                jjtree.closeNodeScope(jjtn000, true);
+                                                                                                jjtc000 = false;
+                                                                                              }
+/*@egen*/ { jjtn000.op = "/";}/*@bgen(jjtree)*/
     } finally {
       if (jjtc000) {
         jjtree.closeNodeScope(jjtn000, true);
       }
     }
-/*@egen*/
+/*@egen*/ 
 }
 
 void factor() : {/*@bgen(jjtree) factor */
@@ -2633,7 +2643,7 @@ void component_reference() : {/*@bgen(jjtree) component_reference */
         try {
 /*@egen*/
 //	[ "." ] IDENT [ array_subscripts ] { "." IDENT [ array_subscripts ] }
-	( "." )? t=<IDENT> { jjtn000.op = t.image; } ( array_subscripts() )? ( "." <IDENT> ( array_subscripts() )? )*/*@bgen(jjtree)*/
+	( "." )? t=<IDENT> { jjtn000.op = t.image; jjtn000.line = t.beginLine; } ( array_subscripts() )? ( "." <IDENT> ( array_subscripts() )? )*/*@bgen(jjtree)*/
         } catch (Throwable jjte000) {
           if (jjtc000) {
             jjtree.clearNodeScope(jjtn000);
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelicaParser.jjt b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelicaParser.jjt
index 977d83d7..87103388 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelicaParser.jjt
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/ModelicaParser.jjt
@@ -71,7 +71,7 @@ TOKEN:
 | "*" | "/" | ".*" | "./"
 | "^" | ".^"
 | "=" | ":=" 
-| <IDENT: ["a"-"z","A"-"Z","_"] (["a"-"z","A"-"Z","_",".", "0"-"9"])* >
+| <IDENT: ["a"-"z","A"-"Z","_"] (["a"-"z","A"-"Z","_","0"-"9"] | "." ["a"-"z","A"-"Z","_","0"-"9"])* >
 | <STRING: "\"" (~["\"", "\\", "\n"] | "\\" ~["\n"])* "\"">
     { matchedToken.image = matchedToken.image.substring(1,matchedToken.image.length()-1); }
 | <EXP: "e" | "e-" | "E" | "E-" | "E+" | "e+" >
@@ -110,7 +110,7 @@ Node stored_definition() #STORED : {
 
 /*** Class Definition **********************************************/
   
-void class_definition() : {
+void class_definition() : { Token t;
 } {
 //  class_definition :
 //  [ encapsulated ]
@@ -120,7 +120,7 @@ void class_definition() : {
 //  class_specifier
     ( "encapsulated" )?
     ( "partial" )?
-    ( "class" { jjtThis.op = "class"; } | "model" { jjtThis.op = "model"; } | "record" | "block" | ( "expandable" )? "connector" | "type" |
+    ( "class" { jjtThis.op = "class"; } | t = "model" { jjtThis.op = "model"; jjtThis.line = t.beginLine; } | "record" | "block" | ( "expandable" )? "connector" | "type" |
     "package" { jjtThis.op = "package"; } | "function" { jjtThis.op = "function"; } | "operator" | "operator function" | "operator record" )
     class_specifier()
 }
@@ -136,7 +136,7 @@ void class_specifier() : { Token t;
 //  | IDENT "=" der "(" name "," IDENT { "," IDENT } ")" comment
 //  | extends IDENT [ class_modification ] string_comment composition
 //  end IDENT  
-    LOOKAHEAD(2) t=<IDENT> { jjtThis.op = t.image; } string_comment() composition() "end" <IDENT>
+    LOOKAHEAD(2) t=<IDENT> { jjtThis.op = t.image; jjtThis.line = t.beginLine; } string_comment() composition() "end" <IDENT>
     | LOOKAHEAD(2) <IDENT> "=" base_prefix() name() ( array_subscripts() )? ( class_modification() )? comment()
     | LOOKAHEAD(3)  <IDENT> "=" "der" "(" name() "," <IDENT> ( "," <IDENT> )* ")" comment()
     | LOOKAHEAD(3) <IDENT> "=" "enumeration" "(" ( ( enum_list() )? | ":" ) ")" comment()
@@ -320,7 +320,7 @@ Parameter declaration() : { Token t;
     Parameter ret = new Parameter();
 } {
 //	IDENT [ array_subscripts ] [ modification ]
-	<IDENT>	{ ret.name = new String(token.image); jjtThis.op = token.image; }
+	<IDENT>	{ ret.name = new String(token.image); jjtThis.op = token.image; jjtThis.line = token.beginLine; }
 	( array_subscripts() )?
 	( ret.optional = modification() )?
 	{
		return ret;
	}
@@ -445,8 +445,8 @@ void statement() : {
 //	comment
 	( component_reference() ( ":=" expression() | function_call_args() )
 		| "(" output_expression_list() ")" ":=" component_reference() function_call_args()
-		| "break"
-		| "return"
+		| "break" { jjtThis.op = "break";}
+		| "return" { jjtThis.op = "return";}
 		| if_statement()
 		| for_statement()
 		| while_statement()
@@ -641,7 +641,7 @@ void arithmetic_expression() : {
 
 void add_op() : {
 } {
-    "+" { jjtThis.op = "+";} | "-" { jjtThis.op = "-";} | ".+" | ".-"
+    "+" { jjtThis.op = "+";} | "-" { jjtThis.op = "-";} | ".+" { jjtThis.op = ".+";} | ".-" { jjtThis.op = ".-";}
 }
 
 
@@ -652,7 +652,7 @@ void term() : {
 
 void mul_op() : {
 } {
-    "*" { jjtThis.op = "*";} | "/" { jjtThis.op = "/";} | ".*" { jjtThis.op = ".*";} | "./"  { jjtThis.op = "./";}
+    ".*" { jjtThis.op = ".*";} | "./"  { jjtThis.op = "./";} | "*" { jjtThis.op = "*";} | "/" { jjtThis.op = "/";} 
 }
 
 void factor() : {
@@ -710,7 +710,7 @@ void component_reference() : {
   Token t;
 } {
 //	[ "." ] IDENT [ array_subscripts ] { "." IDENT [ array_subscripts ] }
-	( "." )? t=<IDENT> { jjtThis.op = t.image; } ( array_subscripts() )? ( "." <IDENT> ( array_subscripts() )? )*
+	( "." )? t=<IDENT> { jjtThis.op = t.image; jjtThis.line = t.beginLine; } ( array_subscripts() )? ( "." <IDENT> ( array_subscripts() )? )*
 }
 
 void function_call_args() : {
diff --git a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/SimpleNode.java b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/SimpleNode.java
index b399a88f..4a12bf77 100644
--- a/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/SimpleNode.java
+++ b/fi.semantum.sysdyn.solver/src/fi/semantum/sysdyn/solver/parser/SimpleNode.java
@@ -11,6 +11,7 @@ class SimpleNode implements Node {
   protected Object value;
   protected ModelParser parser;
   
+  public int line = -1;
   public String op;
 
   public SimpleNode(int i) {
-- 
2.47.1