Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.scl.compiler / src / org / simantics / scl / compiler / internal / elaboration / decomposed / DecomposedExpression.java

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/elaboration/decomposed/DecomposedExpression.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/elaboration/decomposed/DecomposedExpression.java
new file mode 100644 (file)
index 0000000..f579d5c
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/elaboration/decomposed/DecomposedExpression.java
@@ -0,0 +1,71 @@
+package org.simantics.scl.compiler.internal.elaboration.decomposed;\r
+\r
+import java.util.ArrayList;\r
+\r
+import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;\r
+import org.simantics.scl.compiler.elaboration.expressions.ELambdaType;\r
+import org.simantics.scl.compiler.elaboration.expressions.ESimpleLambda;\r
+import org.simantics.scl.compiler.elaboration.expressions.Expression;\r
+import org.simantics.scl.compiler.elaboration.expressions.Variable;\r
+import org.simantics.scl.compiler.top.SCLCompilerConfiguration;\r
+import org.simantics.scl.compiler.types.TVar;\r
+import org.simantics.scl.compiler.types.Type;\r
+import org.simantics.scl.compiler.types.Types;\r
+\r
+public class DecomposedExpression {\r
+    public final TVar[] typeParameters;\r
+    public final Variable[] parameters;\r
+    public final Type[] parameterTypes;\r
+    public final Type effect;\r
+    public final Type returnType;\r
+    public final Expression body;\r
+    \r
+    public DecomposedExpression(TVar[] typeParameters, Variable[] parameters,\r
+            Type[] parameterTypes, Type effect, Type returnType, Expression body) {\r
+        super();\r
+        if(SCLCompilerConfiguration.DEBUG)\r
+            if(effect == null)\r
+                throw new InternalCompilerError();\r
+        this.typeParameters = typeParameters;\r
+        this.parameters = parameters;\r
+        this.parameterTypes = parameterTypes;\r
+        this.effect = effect;\r
+        this.returnType = returnType;\r
+        this.body = body;\r
+    }\r
+\r
+    public static DecomposedExpression decompose(Expression expression) {\r
+        ArrayList<TVar> typeParameterList = new ArrayList<TVar>();\r
+        ArrayList<Variable> parameterList = new ArrayList<Variable>();\r
+        Type effect = Types.NO_EFFECTS;\r
+        while(true) {\r
+            if(expression instanceof ESimpleLambda) {\r
+                ESimpleLambda lambda = (ESimpleLambda)expression;\r
+                parameterList.add(lambda.parameter);\r
+                expression = lambda.value;\r
+                if(Types.canonical(effect) != Types.NO_EFFECTS)\r
+                    throw new InternalCompilerError();\r
+                effect = Types.simplifyFinalEffect(lambda.getLocalEffect());\r
+            } \r
+            else if(expression instanceof ELambdaType) {\r
+                ELambdaType lambda = (ELambdaType)expression;\r
+                expression = lambda.value;\r
+                for(TVar parameter : lambda.parameters)\r
+                    typeParameterList.add(parameter);\r
+            }\r
+            else \r
+                break;\r
+        }      \r
+        \r
+        TVar[] typeParameters = typeParameterList.isEmpty() ? TVar.EMPTY_ARRAY : \r
+            typeParameterList.toArray(new TVar[typeParameterList.size()]);\r
+        Variable[] parameters = parameterList.toArray(new Variable[parameterList.size()]);\r
+        Type[] parameterTypes = Types.getTypes(parameters);\r
+        Type returnType = expression.getType();\r
+        \r
+        return new DecomposedExpression(\r
+                typeParameters, parameters, \r
+                parameterTypes, effect, returnType, \r
+                expression);\r
+    }\r
+}\r