Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/block/LetStatement.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/block/LetStatement.java
new file mode 100755 (executable)
index 0000000..537ec30
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/block/LetStatement.java
@@ -0,0 +1,59 @@
+package org.simantics.scl.compiler.elaboration.expressions.block;\r
+\r
+import org.simantics.scl.compiler.elaboration.contexts.EnvironmentalContext;\r
+import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;\r
+import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;\r
+import org.simantics.scl.compiler.elaboration.expressions.Case;\r
+import org.simantics.scl.compiler.elaboration.expressions.EMatch;\r
+import org.simantics.scl.compiler.elaboration.expressions.ESimpleLet;\r
+import org.simantics.scl.compiler.elaboration.expressions.EVariable;\r
+import org.simantics.scl.compiler.elaboration.expressions.Expression;\r
+import org.simantics.scl.compiler.errors.Locations;\r
+\r
+public class LetStatement extends Statement {\r
+    public Expression pattern;\r
+    public Expression value;\r
+    \r
+    public LetStatement(Expression pattern, Expression value) {\r
+        this.pattern = pattern;\r
+        this.value = value;\r
+    }\r
+\r
+    @Override\r
+    public Expression toExpression(EnvironmentalContext context, boolean monadic, Expression in) {\r
+        if(pattern instanceof EVariable)\r
+            return new ESimpleLet(((EVariable)pattern).getVariable(), value, in);\r
+        else\r
+            //return new EPreLet(Arrays.asList(this), in);\r
+            return new EMatch(location, new Expression[] {value}, new Case[] {new Case(pattern, in)});\r
+    }\r
+    \r
+    @Override\r
+    public void setLocationDeep(long loc) {\r
+        if(location == Locations.NO_LOCATION) {\r
+            location = loc;\r
+            pattern.setLocationDeep(loc);\r
+            value.setLocationDeep(loc);\r
+        }\r
+    }\r
+    \r
+    @Override\r
+    public void resolvePattern(TranslationContext context) {\r
+        pattern = pattern.resolveAsPattern(context);\r
+    }\r
+    \r
+    @Override\r
+    public boolean mayBeRecursive() {\r
+        return pattern.isFunctionDefinitionLhs();\r
+    }\r
+    \r
+    @Override\r
+    public Statement replace(ReplaceContext context) {\r
+        return new LetStatement(pattern.replaceInPattern(context), value.replace(context));\r
+    }\r
+    \r
+    @Override\r
+    public void accept(StatementVisitor visitor) {\r
+        visitor.visit(this);\r
+    }\r
+}
\ No newline at end of file