--- /dev/null
+package org.simantics.scl.compiler.elaboration.expressions;\r
+\r
+import gnu.trove.map.hash.TObjectIntHashMap;\r
+import gnu.trove.set.hash.THashSet;\r
+import gnu.trove.set.hash.TIntHashSet;\r
+\r
+import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;\r
+import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;\r
+import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;\r
+import org.simantics.scl.compiler.elaboration.contexts.TypingContext;\r
+import org.simantics.scl.compiler.errors.Locations;\r
+import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;\r
+import org.simantics.scl.compiler.types.Type;\r
+import org.simantics.scl.compiler.types.Types;\r
+import org.simantics.scl.compiler.types.exceptions.MatchException;\r
+import org.simantics.scl.compiler.types.exceptions.UnificationException;\r
+import org.simantics.scl.compiler.types.kinds.Kinds;\r
+import org.simantics.scl.compiler.types.util.MultiFunction;\r
+\r
+public class ELambda extends SimplifiableExpression {\r
+ public Case[] cases;\r
+ Type effect = Types.NO_EFFECTS;\r
+ \r
+ public ELambda(Case[] cases) {\r
+ this.cases = cases;\r
+ }\r
+ \r
+ public ELambda(Case case_) {\r
+ this(new Case[] {case_});\r
+ }\r
+\r
+ public ELambda(long loc, Case ... cases) {\r
+ super(loc);\r
+ this.cases = cases;\r
+ }\r
+ \r
+ public ELambda(long loc, Expression pat, Expression exp) {\r
+ this(loc, new Case(new Expression[] {pat}, exp));\r
+ }\r
+\r
+ public void collectRefs(TObjectIntHashMap<Object> allRefs, TIntHashSet refs) {\r
+ for(Case case_ : cases)\r
+ case_.collectRefs(allRefs, refs);\r
+ }\r
+ \r
+ @Override\r
+ public void collectVars(TObjectIntHashMap<Variable> allVars,\r
+ TIntHashSet vars) {\r
+ for(Case case_ : cases)\r
+ case_.collectVars(allVars, vars);\r
+ }\r
+\r
+ public Expression decomposeMatching() {\r
+ Expression[] patterns = cases[0].patterns;\r
+ int arity = patterns.length;\r
+ \r
+ // Simple cases\r
+ if(cases.length == 1 && \r
+ !(cases[0].value instanceof GuardedExpressionGroup)) {\r
+ boolean noMatchingNeeded = true;\r
+ for(int i=0;i<arity;++i)\r
+ if(!(patterns[i] instanceof EVariable)) {\r
+ noMatchingNeeded = false;\r
+ break;\r
+ }\r
+ if(noMatchingNeeded) {\r
+ Expression decomposed = cases[0].value.decomposeMatching();\r
+ Type effect = this.effect;\r
+ for(int i=arity-1;i>=0;--i) {\r
+ Variable var = ((EVariable)patterns[i]).getVariable(); \r
+ decomposed = new ESimpleLambda(getLocation(), var, effect, decomposed);\r
+ effect = Types.NO_EFFECTS;\r
+ }\r
+ return decomposed;\r
+ }\r
+ }\r
+ \r
+ // Complex case\r
+ Variable[] vars = new Variable[arity];\r
+ Expression[] scrutinee = new Expression[arity];\r
+ for(int i=0;i<arity;++i) {\r
+ vars[i] = new Variable("temp" + i);\r
+ Type type = patterns[i].getType();\r
+ vars[i].setType(type);\r
+ scrutinee[i] = new EVariable(getLocation(), vars[i]);\r
+ scrutinee[i].setType(type);\r
+ }\r
+ Expression decomposed = new EMatch(getLocation(), scrutinee, cases);\r
+ Type curEffect = this.effect;\r
+ for(int i=arity-1;i>=0;--i) { \r
+ decomposed = new ESimpleLambda(getLocation(), vars[i], curEffect, decomposed); \r
+ curEffect = Types.NO_EFFECTS; \r
+ }\r
+ return decomposed;\r
+ }\r
+ \r
+ @Override\r
+ protected void updateType() throws MatchException {\r
+ setType(Types.functionE(Types.getTypes(cases[0].patterns), effect, cases[0].value.getType()));\r
+ }\r
+ \r
+ @Override\r
+ public Expression simplify(SimplificationContext context) {\r
+ return decomposeMatching().simplify(context);\r
+ }\r
+\r
+ @Override\r
+ public void collectFreeVariables(THashSet<Variable> vars) {\r
+ for(Case case_ : cases)\r
+ case_.collectFreeVariables(vars);\r
+ }\r
+\r
+ @Override\r
+ public Expression resolve(TranslationContext context) {\r
+ for(Case case_ : cases)\r
+ case_.resolve(context);\r
+ return this;\r
+ }\r
+ \r
+ @Override\r
+ public void setLocationDeep(long loc) {\r
+ if(location == Locations.NO_LOCATION) {\r
+ location = loc;\r
+ for(Case case_ : cases)\r
+ case_.setLocationDeep(loc);\r
+ }\r
+ }\r
+ \r
+ @Override\r
+ public Expression replace(ReplaceContext context) {\r
+ Case[] newCases = new Case[cases.length];\r
+ for(int i=0;i<cases.length;++i)\r
+ newCases[i] = cases[i].replace(context);\r
+ return new ELambda(newCases);\r
+ }\r
+\r
+ public Case[] getCases() {\r
+ return cases;\r
+ }\r
+ \r
+ public Expression checkBasicType(TypingContext context, Type requiredType) {\r
+ int arity = cases[0].patterns.length;\r
+ MultiFunction mfun;\r
+ try {\r
+ mfun = Types.unifyFunction(requiredType, arity);\r
+ } catch (UnificationException e) {\r
+ int requiredArity = Types.getArity(requiredType);\r
+ context.getErrorLog().log(cases[0].getLhs(), "Arity is " + requiredArity + " but "\r
+ + arity + " patterns have been given.");\r
+ setType(Types.metaVar(Kinds.STAR));\r
+ return this;\r
+ }\r
+ \r
+ effect = mfun.effect;\r
+ context.pushEffectUpperBound(location, mfun.effect);\r
+ for(Case case_ : cases)\r
+ case_.checkType(context, mfun.parameterTypes, mfun.returnType);\r
+ context.popEffectUpperBound();\r
+ return this;\r
+ }\r
+ \r
+ @Override\r
+ public Expression inferType(TypingContext context) {\r
+ int arity = cases[0].patterns.length;\r
+ effect = Types.metaVar(Kinds.EFFECT);\r
+ context.pushEffectUpperBound(location, effect);\r
+ Type[] parameterTypes = new Type[arity]; \r
+ for(int i=0;i<parameterTypes.length;++i)\r
+ parameterTypes[i] = Types.metaVar(Kinds.STAR);\r
+ Type requiredType = Types.metaVar(Kinds.STAR);\r
+ for(Case case_ : cases)\r
+ case_.checkType(context, parameterTypes, requiredType);\r
+ context.popEffectUpperBound();\r
+ return this;\r
+ }\r
+\r
+ @Override\r
+ public Expression decorate(ExpressionDecorator decorator) {\r
+ if(decorator.decorateSubstructure(this))\r
+ for(Case case_ : cases)\r
+ case_.decorate(decorator);\r
+ return decorator.decorate(this);\r
+ }\r
+ \r
+ @Override\r
+ public boolean isEffectful() {\r
+ return false;\r
+ }\r
+\r
+ @Override\r
+ public void collectEffects(THashSet<Type> effects) {\r
+ for(Case case_ : cases) {\r
+ for(Expression pattern : case_.patterns)\r
+ pattern.collectEffects(effects);\r
+ case_.value.collectEffects(effects);\r
+ }\r
+ }\r
+ \r
+ @Override\r
+ public void accept(ExpressionVisitor visitor) {\r
+ visitor.visit(this);\r
+ }\r
+\r
+ @Override\r
+ public void forVariables(VariableProcedure procedure) {\r
+ for(Case case_ : cases)\r
+ case_.forVariables(procedure);\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