public object Visit_DeclarationStatement(DeclarationStatement declStmt)
{
string varName = declStmt.Name;
Current[varName] = declStmt.Expression.Accept(this);
return(0);
}
public object Visit_DeclarationStatement(DeclarationStatement declStmt)
{
string type = declStmt.Type;
if (currentTable.LookUp(type, out ISymbol symbol))
{
string symbolName = declStmt.Name;
ISymbol varSymbol = new VariableSymbol(symbolName, symbol);
if (!currentTable.Define(varSymbol))
{
throw RaiseError(ScriptErrorCode.ID_ALREADY_DECLARED, declStmt.Token);
}
return(0);
}
throw RaiseError(ScriptErrorCode.UNDEFINED_SYMBOL, declStmt.Token);
}
private DeclarationStatement Consume_VariableDeclaration()
{
DeclarationStatement declStmt = new DeclarationStatement();
string variableType = currentToken.Value.ToString();
Consume(TokenType.TYPESPEC);
string variableName = currentToken.Value.ToString();
declStmt.SetType(variableType);
declStmt.SetName(variableName);
Consume(TokenType.ID);
Consume(TokenType.ASSIGN);
IExpression expression = Consume_Expression();
declStmt.SetExpression(expression);
Consume(TokenType.SEMI);
return(declStmt);
}