public override ICodeNode Parse(Token token)
{
// Create the ASSIGN node.
ICodeNode assignNode = ICodeFactory.CreateICodeNode(ICodeNodeTypeImplementation.ASSIGN);
string targetName = token.text.ToLower();
SymbolTableEntry targetID = symbolTableStack.Lookup(targetName);
if (targetID == null)
targetID = symbolTableStack.EnterLocal(targetName);
targetID.AppendLineNumber(token.lineNumber);
token = NextToken();
ICodeNode variableNode = ICodeFactory.CreateICodeNode(ICodeNodeTypeImplementation.VARIABLE);
variableNode.SetAttribute(ICodeKeyImplementation.ID, targetID);
assignNode.AddChild(variableNode);
if (token.type == PascalTokenType.COLON_EQUALS)
token = NextToken();
else
errorHandler.flag(token, PascalErrorCode.MISSING_COLON_EQUALS, this);
ExpressionParser expressionParser = new ExpressionParser(this);
assignNode.AddChild(expressionParser.Parse(token));
return assignNode;
}