Merged changes from feature/scl to master.

[simantics/platform.git] / bundles / org.simantics.scl.compiler / src / org / simantics / scl / compiler / elaboration / expressions / EViewPattern.java

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/EViewPattern.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/EViewPattern.java
new file mode 100644 (file)
index 0000000..268ee8e
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/EViewPattern.java
@@ -0,0 +1,137 @@
+package org.simantics.scl.compiler.elaboration.expressions;\r
+\r
+import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;\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.environment.Environment;\r
+import org.simantics.scl.compiler.errors.Locations;\r
+import org.simantics.scl.compiler.internal.codegen.references.IVal;\r
+import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;\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.util.MultiFunction;\r
+\r
+import gnu.trove.map.hash.TObjectIntHashMap;\r
+import gnu.trove.set.hash.THashSet;\r
+import gnu.trove.set.hash.TIntHashSet;\r
+\r
+public class EViewPattern extends Expression {\r
+    public Expression expression;\r
+    public Expression pattern;\r
+    \r
+    public EViewPattern(Expression expression, Expression pattern) {\r
+        this.expression = expression;\r
+        this.pattern = pattern;\r
+    }\r
+\r
+    @Override\r
+    public void collectRefs(TObjectIntHashMap<Object> allRefs, TIntHashSet refs) {\r
+        expression.collectRefs(allRefs, refs);\r
+        pattern.collectRefs(allRefs, refs);\r
+    }\r
+\r
+    @Override\r
+    public void collectVars(TObjectIntHashMap<Variable> allVars, TIntHashSet vars) {\r
+        expression.collectVars(allVars, vars);\r
+        pattern.collectVars(allVars, vars);\r
+    }\r
+\r
+    @Override\r
+    public void forVariables(VariableProcedure procedure) {\r
+        expression.forVariables(procedure);\r
+        pattern.forVariables(procedure);\r
+    }\r
+    \r
+    @Override\r
+    public Expression inferType(TypingContext context) {\r
+        context.setInPattern(false);\r
+        expression = expression.inferType(context);\r
+        context.setInPattern(true);\r
+        MultiFunction mfun;\r
+        try {\r
+            mfun = Types.matchFunction(expression.getType(), 1);\r
+        } catch (MatchException e) {\r
+            context.getErrorLog().log(expression.location, "Expected a function as a transformation expression.");\r
+            return new EError(location);\r
+        }\r
+        setType(mfun.parameterTypes[0]);\r
+        pattern.checkType(context, mfun.returnType);\r
+        return this;\r
+    }\r
+\r
+    @Override\r
+    protected void updateType() throws MatchException {\r
+        MultiFunction mfun = Types.matchFunction(expression.getType(), 1);\r
+        setType(mfun.parameterTypes[0]);\r
+    }\r
+\r
+    @Override\r
+    public IVal toVal(Environment env, CodeWriter w) {\r
+        throw new InternalCompilerError(location, "EViewPattern.toVal should not be invoked.");\r
+    }\r
+\r
+    @Override\r
+    public void collectFreeVariables(THashSet<Variable> vars) {\r
+        throw new InternalCompilerError(location, "Cannot collect free variables for a pattern.");\r
+    }\r
+    \r
+    @Override\r
+    public void removeFreeVariables(THashSet<Variable> vars) {\r
+        expression.collectFreeVariables(vars);\r
+        pattern.removeFreeVariables(vars);\r
+    }\r
+\r
+    @Override\r
+    public Expression resolve(TranslationContext context) {\r
+        context.getErrorLog().log("View pattern cannot occur only in patterns. Maybe you are missing '\\' in front of a lambda experssion?");\r
+        return new EError(location);\r
+    }\r
+\r
+    @Override\r
+    public Expression resolveAsPattern(TranslationContext context) {\r
+        expression = expression.resolve(context);\r
+        pattern = pattern.resolveAsPattern(context);\r
+        return this;\r
+    }\r
+    \r
+    @Override\r
+    public void setLocationDeep(long loc) {\r
+        if(location == Locations.NO_LOCATION) {\r
+            location = loc; \r
+            expression.setLocationDeep(loc);\r
+            pattern.setLocationDeep(loc);\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public Expression decorate(ExpressionDecorator decorator) {\r
+        expression = expression.decorate(decorator);\r
+        return this;\r
+    }\r
+\r
+    @Override\r
+    public void collectEffects(THashSet<Type> effects) {\r
+        expression.collectEffects(effects);\r
+    }\r
+\r
+    @Override\r
+    public void accept(ExpressionVisitor visitor) {\r
+        visitor.visit(this);\r
+    }\r
+\r
+    @Override\r
+    public Expression accept(ExpressionTransformer transformer) {\r
+        return transformer.transform(this);\r
+    }\r
+    \r
+    @Override\r
+    public Expression simplify(SimplificationContext context) {\r
+        expression = expression.simplify(context);\r
+        pattern = pattern.simplify(context);\r
+        return this;\r
+    }\r
+\r
+}\r