private void ReadStringLiteral(TextPosition start, bool allowMultiline)
{
var end = _position;
bool isMultiLine = false;
NextChar(); // Skip '
if (allowMultiline && _c == '\'')
{
end = _position;
NextChar();
if (_c == '\'')
{
end = _position;
NextChar();
// we have an opening ''' -> this a multi-line literal string
isMultiLine = true;
SkipImmediateNextLine();
}
else
{
// Else this is an empty literal string
_token = new SyntaxTokenValue(TokenKind.StringLiteral, start, end, string.Empty);
return;
}
}
_textBuilder.Length = 0;
continue_parsing_string:
while (_c != '\'' && _c != Eof)
{
if (!isMultiLine && CharHelper.IsNewLine(_c))
{
AddError("Invalid newline in a string", _position, _position);
}
else if (CharHelper.IsControlCharacter(_c) && (!isMultiLine || !CharHelper.IsNewLine(_c)))
{
AddError($"Invalid control character found {((char)_c).ToPrintableString()}", start, start);
}
_textBuilder.AppendUtf32(_c);
end = _position;
NextChar();
}
if (isMultiLine)
{
if (_c == '\'')
{
end = _position;
NextChar();
if (_c == '\'')
{
end = _position;
NextChar();
if (_c == '\'')
{
end = _position;
NextChar();
}
else
{
_textBuilder.Append('\'');
_textBuilder.Append('\'');
goto continue_parsing_string;
}
}
else
{
_textBuilder.Append('\'');
goto continue_parsing_string;
}
}
else
{
AddError("Invalid End-Of-File found for multi-line literal string", end, end);
}
_token = new SyntaxTokenValue(TokenKind.StringLiteralMulti, start, end, _textBuilder.ToString());
}
else
{
if (_c == '\'')
{
end = _position;
NextChar();
}
else
{
AddError("Invalid End-Of-File found on string literal", end, end);
}
_token = new SyntaxTokenValue(TokenKind.StringLiteral, start, end, _textBuilder.ToString());
}
}
