private DeclarationStatement Consume_BlockDeclaration()
{
Token token = currentToken;
switch (token.Type)
{
case TokenType.L_BLOCK:
Consume(TokenType.L_BLOCK);
BlockDeclarationExpression declStmt = new BlockDeclarationExpression();
string variableType = "Block";
string variableName = currentToken.Value.ToString();
StringLiteral lit = ExpressionFactory.CreateStringLiteral(variableName, currentToken);
declStmt.SetType(variableType);
declStmt.SetName(variableName);
Consume(TokenType.ID);
Consume(TokenType.R_BLOCK);
BlockStatement blockStmt = Consume_BlockStatement();
blockStmt.Append(Consume_EndBlock());
declStmt.SetExpression(blockStmt);
return(declStmt);
}
throw RaiseError(ScriptErrorCode.UNEXPECTED_TOKEN, token);
}
public object Visit_BlockDeclarationStatement(BlockDeclarationExpression declExpr)
{
string varName = declExpr.Name;
Current[varName] = new BlockValue(declExpr.Expression);
return(0);
}
public object Visit_BlockDeclarationStatement(BlockDeclarationExpression declExpr)
{
if (currentTable.LookUp("Block", out ISymbol symbol))
{
string symbolName = (string)declExpr.Name;
ISymbol varSymbol = new VariableSymbol(symbolName, symbol);
if (!currentTable.Define(varSymbol))
{
throw RaiseError(ScriptErrorCode.ID_ALREADY_DECLARED, declExpr.Token);
}
}
return(0);
}
