first commit

hrmsEjb/org/nfunk/jep/function/Assign.java

@@ -0,0 +1,26 @@
+package org.nfunk.jep.function;
+
+import java.util.Stack;
+import org.nfunk.jep.ASTVarNode;
+import org.nfunk.jep.Node;
+import org.nfunk.jep.ParseException;
+import org.nfunk.jep.ParserVisitor;
+import org.nfunk.jep.Variable;
+
+public class Assign extends PostfixMathCommand implements SpecialEvaluationI {
+  public Object evaluate(Node paramNode, Object paramObject, ParserVisitor paramParserVisitor, Stack paramStack) throws ParseException {
+    if (paramNode.jjtGetNumChildren() != 2)
+      throw new ParseException("Assignment opperator must have 2 operators."); 
+    paramNode.jjtGetChild(1).jjtAccept(paramParserVisitor, paramObject);
+    checkStack(paramStack);
+    Object object = paramStack.peek();
+    Node node = paramNode.jjtGetChild(0);
+    if (node instanceof ASTVarNode) {
+      ASTVarNode aSTVarNode = (ASTVarNode)node;
+      Variable variable = aSTVarNode.getVar();
+      variable.setValue(object);
+      return object;
+    } 
+    throw new ParseException("Assignment should have a variable for the lhs.");
+  }
+}