Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.scl.compiler / src / org / simantics / scl / compiler / internal / interpreted / ILet.java

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/interpreted/ILet.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/interpreted/ILet.java
new file mode 100644 (file)
index 0000000..39c9069
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/interpreted/ILet.java
@@ -0,0 +1,37 @@
+package org.simantics.scl.compiler.internal.interpreted;
+
+
+public class ILet implements IExpression {
+    private final int variableId;
+    private final IExpression value;
+    private final IExpression in;
+
+    public ILet(int variableId, IExpression value, IExpression in) {
+        this.variableId = variableId;
+        this.value = value;
+        this.in = in;
+    }
+
+    @Override
+    public Object execute(Object[] variableBindings) {
+        variableBindings[variableId] = value.execute(variableBindings);
+        try {
+            return in.execute(variableBindings);
+        } finally {
+            variableBindings[variableId] = null;
+        }
+    }
+    
+    @Override
+    public String toString() {
+        StringBuilder b = new StringBuilder();
+        b.append("(let v");
+        b.append(variableId);
+        b.append(" = ");
+        b.append(value);
+        b.append(" in ");
+        b.append(in);
+        b.append(')');
+        return b.toString();
+    }
+}