--- /dev/null
+package org.simantics.scl.compiler.elaboration.expressions;\r
+\r
+import java.util.ArrayList;\r
+\r
+import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;\r
+import org.simantics.scl.compiler.common.names.Name;\r
+import org.simantics.scl.compiler.common.precedence.Associativity;\r
+import org.simantics.scl.compiler.common.precedence.Precedence;\r
+import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;\r
+import org.simantics.scl.compiler.elaboration.errors.NotPatternException;\r
+import org.simantics.scl.compiler.elaboration.expressions.lhstype.FunctionDefinitionLhs;\r
+import org.simantics.scl.compiler.elaboration.expressions.lhstype.LhsType;\r
+import org.simantics.scl.compiler.elaboration.modules.SCLValue;\r
+import org.simantics.scl.compiler.errors.Locations;\r
+\r
+\r
+\r
+public class EBinary extends ASTExpression {\r
+ public static final int NEGATION_LEVEL = 6;\r
+ \r
+ public Expression left;\r
+ public ArrayList<EBinaryRightSide> rights = new ArrayList<EBinaryRightSide>();\r
+ public EVar negation;\r
+\r
+ public EBinary(Expression left, EVar negation) {\r
+ this.left = left;\r
+ this.negation = negation;\r
+ }\r
+\r
+ private EBinary(Expression left, EVar operator, Expression right) {\r
+ this.left = left;\r
+ rights.add(new EBinaryRightSide(operator, right));\r
+ }\r
+\r
+ public static EBinary create(Expression left, EVar operator, Expression right) {\r
+ if(left instanceof EBinary) {\r
+ EBinary left_ = (EBinary)left;\r
+ left_.rights.add(new EBinaryRightSide(operator, right));\r
+ return left_;\r
+ }\r
+ else\r
+ return new EBinary(left, operator, right);\r
+ }\r
+\r
+ @Override\r
+ public Expression resolve(TranslationContext context) {\r
+ return parseOperators(context).resolve(context);\r
+ }\r
+\r
+ private static final Name NEG = Name.create("Prelude", "neg");\r
+ \r
+ public Expression parseOperators(TranslationContext context) {\r
+ ArrayList<Expression> output = new ArrayList<Expression>();\r
+ ArrayList<Expression> ops = new ArrayList<Expression>();\r
+ ArrayList<EVar> opAsts = new ArrayList<EVar>();\r
+ \r
+ EVar negation = this.negation;\r
+ \r
+ output.add(left);\r
+ for(EBinaryRightSide right : rights) {\r
+ // Read op\r
+ Expression op = context.resolveExpression(right.operator.location, right.operator.name);\r
+ if(op == null)\r
+ return new EError(location);\r
+ Precedence opPrec = op.getPrecedence();\r
+ while(!ops.isEmpty()) {\r
+ Expression oldOp = ops.get(ops.size()-1);\r
+ Precedence oldOpPrecedence = oldOp.getPrecedence();\r
+ \r
+ if(oldOpPrecedence.level < opPrec.level)\r
+ break;\r
+ if(oldOpPrecedence.level == opPrec.level) {\r
+ if(opPrec.associativity == Associativity.RIGHT)\r
+ break;\r
+ if(opPrec.associativity == Associativity.NONASSOC) {\r
+ context.getErrorLog().log(right.operator.location, \r
+ "Operator " + right.operator.name + " is not associative.");\r
+ return new EError(location); \r
+ }\r
+ }\r
+ \r
+ // Pop op \r
+ ops.remove(ops.size()-1);\r
+ Expression r = output.remove(output.size()-1);\r
+ Expression l = output.remove(output.size()-1);\r
+ output.add(binary(l, oldOp, opAsts.remove(opAsts.size()-1), r));\r
+ }\r
+ if(negation != null && ops.isEmpty()) {\r
+ if(opPrec.level <= NEGATION_LEVEL) { \r
+ SCLValue neg = context.getEnvironment().getValue(NEG);\r
+ if(neg == null) {\r
+ context.getErrorLog().log(location, \r
+ "Couldn't resolve variable neg.");\r
+ return new EError(location);\r
+ }\r
+ output.set(0, unary(neg, negation, output.get(0)));\r
+ negation = null;\r
+ }\r
+ }\r
+ ops.add(op);\r
+ opAsts.add(right.operator);\r
+ \r
+ // Read value\r
+ output.add(right.right);\r
+ }\r
+ \r
+ // Pop rest\r
+ while(!ops.isEmpty()) { \r
+ Expression oldOp = ops.remove(ops.size()-1);\r
+ Expression r = output.remove(output.size()-1);\r
+ Expression l = output.remove(output.size()-1);\r
+ output.add(binary(l, oldOp, opAsts.remove(opAsts.size()-1), r));\r
+ }\r
+ if(negation != null) {\r
+ SCLValue neg = context.getEnvironment().getValue(NEG);\r
+ if(neg == null) {\r
+ context.getErrorLog().log(location, \r
+ "Couldn't resolve variable neg.");\r
+ return new EError(location);\r
+ }\r
+ output.set(0, unary(neg, negation, output.get(0)));\r
+ }\r
+ \r
+ return output.get(0);\r
+ \r
+ //System.out.println("parseOperators: " + this);\r
+ //return parse(context, left, rights.listIterator(), new Precedence(-1, Associativity.NONASSOC));\r
+ }\r
+\r
+ /*\r
+ private Expression parse(TranslationContext context,\r
+ Expression lhs, ListIterator<EBinaryRightSide> it, Precedence minPrec) {\r
+ while(it.hasNext()) {\r
+ EBinaryRightSide right = it.next();\r
+ SCLValue op = context.resolveValue(right.operator.name);\r
+ if(op == null) {\r
+ context.getErrorLog().log(right.operator, \r
+ "Couldn't resolve variable " + right.operator.name + ".");\r
+ return lhs;\r
+ }\r
+ Precedence opPrec = op.getPrecedence();\r
+ if(minPrec.level > opPrec.level)\r
+ break;\r
+ Expression rhs = right.right;\r
+ while(it.hasNext()) {\r
+ EVar var = it.next().operator;\r
+ SCLValue nextOp = context.resolveValue(var.name);\r
+ if(nextOp == null) {\r
+ context.getErrorLog().log(var, \r
+ "Couldn't resolve variable " + var.name + ".");\r
+ return lhs;\r
+ }\r
+ it.previous();\r
+ Precedence nextPrec = nextOp.getPrecedence();\r
+ int precDiff = opPrec.level - nextPrec.level;\r
+ if(precDiff == 0) {\r
+ if(opPrec.associativity == Associativity.LEFT)\r
+ break;\r
+ else if(opPrec.associativity == Associativity.NONASSOC) {\r
+ context.getErrorLog().log(it.next().operator, "Nonassociative operator.");\r
+ return lhs;\r
+ }\r
+ }\r
+ else if(precDiff > 0)\r
+ break;\r
+ rhs = parse(context, rhs, it, nextPrec);\r
+ }\r
+ lhs = binary(lhs, op, right.operator, rhs);\r
+ } \r
+ return lhs;\r
+ }\r
+ */\r
+ private Expression binary(Expression lhs, Expression op, EVar opAst, Expression rhs) {\r
+ return new EApply(Locations.combine(lhs.location, rhs.location), op, lhs, rhs); \r
+ }\r
+ \r
+ private Expression unary(SCLValue operator, EVar opAst, Expression expression) {\r
+ EConstant op = new EConstant(opAst.location, operator);\r
+ return new EApply(expression.location /*wrong*/, op, expression);\r
+ }\r
+ \r
+ @Override\r
+ public EVar getPatternHead() throws NotPatternException {\r
+ if(rights.size() == 1)\r
+ return rights.get(0).operator;\r
+ else\r
+ throw new NotPatternException(this);\r
+ }\r
+ \r
+ @Override\r
+ public LhsType getLhsType() throws NotPatternException {\r
+ if(rights.size() == 1)\r
+ return new FunctionDefinitionLhs(rights.get(0).operator.name);\r
+ else\r
+ throw new InternalCompilerError();\r
+ }\r
+ \r
+ @Override\r
+ public void getParameters(TranslationContext context,\r
+ ArrayList<Expression> parameters) {\r
+ parseOperators(context).getParameters(context, parameters);\r
+ }\r
+\r
+ public static Expression negate(EVar op, Expression expression) {\r
+ if(expression instanceof EBinary) {\r
+ ((EBinary)expression).negation = op;\r
+ return expression;\r
+ }\r
+ /*else if(expression instanceof EIntegerLiteral) {\r
+ EIntegerLiteral literal = (EIntegerLiteral)expression;\r
+ literal.value = -literal.value;\r
+ return expression;\r
+ }*/\r
+ else\r
+ return new EBinary(expression, op);\r
+ }\r
+ \r
+ @Override\r
+ public int getFunctionDefinitionArity() throws NotPatternException {\r
+ return 2;\r
+ }\r
+ \r
+ @Override\r
+ public void setLocationDeep(long loc) {\r
+ if(location == Locations.NO_LOCATION) {\r
+ location = loc;\r
+ left.setLocationDeep(loc);\r
+ if(negation != null)\r
+ negation.setLocationDeep(loc);\r
+ for(EBinaryRightSide right : rights)\r
+ right.setLocationDeep(loc);\r
+ }\r
+ }\r
+ \r
+ @Override\r
+ public Expression accept(ExpressionTransformer transformer) {\r
+ return transformer.transform(this);\r
+ }\r
+\r
+}\r
Code Review / simantics / platform.git / blobdiff