Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/EAsPattern.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/EAsPattern.java
new file mode 100644 (file)
index 0000000..0a11d9b
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/EAsPattern.java
@@ -0,0 +1,160 @@
+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.common.exceptions.InternalCompilerError;\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.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.exceptions.MatchException;\r
+\r
+public class EAsPattern extends Expression {\r
+\r
+    Variable var;\r
+    EVar eVar;\r
+    Expression pattern;\r
+\r
+    public EAsPattern(EVar eVar, Expression pattern) {\r
+        this.eVar = eVar;\r
+        this.pattern = pattern;\r
+    }\r
+    \r
+    public EAsPattern(Variable var, Expression pattern) {\r
+        this.var = var;\r
+        this.pattern = pattern;\r
+    }\r
+    \r
+    public Variable getVariable() {\r
+        return var;\r
+    }\r
+    \r
+    public Expression getPattern() {\r
+        return pattern;\r
+    }\r
+\r
+    @Override\r
+    public void collectRefs(TObjectIntHashMap<Object> allRefs,\r
+            TIntHashSet refs) {\r
+        pattern.collectRefs(allRefs, refs);\r
+    }\r
+\r
+    @Override\r
+    public void collectVars(TObjectIntHashMap<Variable> allVars,\r
+            TIntHashSet vars) {\r
+        int id = allVars.get(var);\r
+        if(id >= 0)\r
+            vars.add(id);\r
+        pattern.collectVars(allVars, vars);\r
+    }\r
+\r
+    @Override\r
+    public void collectFreeVariables(THashSet<Variable> vars) {\r
+        vars.add(var);\r
+        pattern.collectFreeVariables(vars);\r
+    }\r
+    \r
+    @Override\r
+    public Expression simplify(SimplificationContext context) {\r
+        pattern = pattern.simplify(context);\r
+        return this;\r
+    }\r
+\r
+    @Override\r
+    public Expression resolve(TranslationContext context) {\r
+        context.getErrorLog().log(location, "As binding (@) can be used only in patterns.");\r
+        return this;\r
+    }\r
+    \r
+    @Override\r
+    public Expression resolveAsPattern(TranslationContext context) {\r
+        var = context.newVariable(eVar.name);\r
+        pattern = pattern.resolveAsPattern(context);\r
+        return this;\r
+    }\r
+    \r
+    @Override\r
+    protected void updateType() throws MatchException {\r
+        setType(pattern.getType());\r
+    }\r
+\r
+    @Override\r
+    public IVal toVal(Environment env, CodeWriter w) {\r
+        throw new InternalCompilerError("EAsPattern allowed only in patterns.");\r
+    }\r
+    \r
+    @Override\r
+    public Expression inferType(TypingContext context) {\r
+        pattern = pattern.inferType(context);\r
+        var.setType(pattern.getType());\r
+        return this;\r
+    }\r
+    \r
+    @Override\r
+    public Expression checkBasicType(TypingContext context, Type requiredType) {\r
+        pattern = pattern.checkBasicType(context, requiredType);\r
+        var.setType(pattern.getType());\r
+        return this;\r
+    }\r
+\r
+    @Override\r
+    public Expression decorate(ExpressionDecorator decorator) {\r
+        pattern = pattern.decorate(decorator);\r
+        return decorator.decorate(this);\r
+    }\r
+    \r
+    @Override\r
+    public Expression replace(ReplaceContext context) {\r
+        if(!context.inPattern) \r
+            throw new IllegalStateException();\r
+        \r
+        Variable newVariable = new Variable(var.name);\r
+        newVariable.setType(var.getType().replace(context.tvarMap));\r
+        context.varMap.put(var, new EVariable(newVariable));\r
+        \r
+        EAsPattern result = new EAsPattern(eVar, pattern.replace(context));\r
+        result.var = newVariable;\r
+        \r
+        return result;\r
+    }\r
+\r
+    @Override\r
+    public void collectEffects(THashSet<Type> effects) {\r
+        pattern.collectEffects(effects);\r
+    }\r
+    \r
+    @Override\r
+    public void setLocationDeep(long loc) {\r
+        if(location == Locations.NO_LOCATION) {\r
+            location = loc;\r
+            pattern.setLocationDeep(loc);\r
+            if(eVar != null)\r
+                eVar.setLocationDeep(loc);\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
+        procedure.execute(eVar.location, var);\r
+        pattern.forVariables(procedure);\r
+    }\r
+    \r
+    @Override\r
+    public Expression accept(ExpressionTransformer transformer) {\r
+        return transformer.transform(this);\r
+    }\r
+\r
+}\r