private static bool TryGetMenuStatement(Genero4glParser parser, out MenuStatement node, bool returnFalseInsteadOfErrors = false)
{
bool result = false;
node = null;
MenuStatement menuStmt;
if ((result = MenuStatement.TryParseNode(parser, out menuStmt, returnFalseInsteadOfErrors)))
{
node = menuStmt;
}
return(result);
}
public static bool TryParseNode(Genero4glParser parser, out MenuStatement node, bool returnFalseInsteadOfErrors = false)
{
node = new MenuStatement();
node.StartIndex = parser.Token.Span.Start;
node.OptionNames = new List <ExpressionNode>();
bool result = true;
switch (parser.PeekToken().Kind)
{
case TokenKind.ContinueKeyword:
case TokenKind.ExitKeyword:
{
if (parser.PeekToken(TokenKind.MenuKeyword, 2))
{
parser.NextToken();
node.StartIndex = parser.Token.Span.Start;
parser.NextToken();
}
else
{
result = false;
}
break;
}
case TokenKind.NextKeyword:
{
parser.NextToken();
if (parser.PeekToken(TokenKind.OptionKeyword))
{
parser.NextToken();
FglNameExpression nameExpr;
if (FglNameExpression.TryParseNode(parser, out nameExpr))
{
node.OptionNames.Add(nameExpr);
}
else
{
parser.ReportSyntaxError("Invalid option name found in menu statement.");
}
}
else
{
if (!returnFalseInsteadOfErrors)
{
parser.ReportSyntaxError("Expecting \"option\" keyword in menu statement.");
}
else
{
return(false);
}
}
break;
}
case TokenKind.ShowKeyword:
case TokenKind.HideKeyword:
{
parser.NextToken();
if (parser.PeekToken(TokenKind.OptionKeyword))
{
parser.NextToken();
if (parser.PeekToken(TokenKind.AllKeyword))
{
parser.NextToken();
}
else
{
FglNameExpression nameExpr;
ExpressionNode strExpr;
while (true)
{
if (FglNameExpression.TryParseNode(parser, out nameExpr))
{
node.OptionNames.Add(nameExpr);
}
else if (parser.PeekToken(TokenCategory.StringLiteral) &&
FglExpressionNode.TryGetExpressionNode(parser, out strExpr, new List <TokenKind> {
TokenKind.Comma
}))
{
node.OptionNames.Add(strExpr);
}
else
{
break;
}
if (!parser.PeekToken(TokenKind.Comma))
{
break;
}
parser.NextToken();
}
}
}
else
{
if (!returnFalseInsteadOfErrors)
{
parser.ReportSyntaxError("Expecting \"option\" keyword in menu statement.");
}
else
{
return(false);
}
}
break;
}
default:
{
result = false;
break;
}
}
node.EndIndex = parser.Token.Span.End;
return(result);
}
