public PeekToken Peek(PeekToken peekToken)
{
int oldIndex = _index;
_index = peekToken.TokenIndex;
if (_index >= _inputString.Length)
{
_index = oldIndex;
return(null);
}
foreach (KeyValuePair <Tokens, string> pair in _tokens)
{
var r = new Regex(pair.Value);
Match m = r.Match(_inputString, _index);
if (m.Success && m.Index == _index)
{
_index += m.Length;
var pt = new PeekToken(_index, new Token(pair.Key, m.Value));
_index = oldIndex;
return(pt);
}
}
var pt2 = new PeekToken(_index + 1, new Token(Tokens.UNDEFINED, string.Empty));
_index = oldIndex;
return(pt2);
}
internal static string GetStringExpression(this TokenParser parser)
{
string retval = "";
int parens = 0;
parser.SkipWhiteSpace();
PeekToken pToken = parser.Peek();
while (pToken != null && pToken.TokenPeek.TokenName != TokenParser.Tokens.NEWLINE)
{
if (pToken.TokenPeek.TokenName == TokenParser.Tokens.STRING || pToken.TokenPeek.TokenName == TokenParser.Tokens.PLUS ||
pToken.TokenPeek.TokenName == TokenParser.Tokens.STRINGLABEL)
{
retval = retval + pToken.TokenPeek.TokenValue;
parser.GetToken();
parser.SkipWhiteSpace();
pToken = parser.Peek();
continue;
}
if (pToken.TokenPeek.TokenName == TokenParser.Tokens.LPAREN)
{
parens++;
retval = retval + pToken.TokenPeek.TokenValue;
parser.GetToken();
parser.SkipWhiteSpace();
pToken = parser.Peek();
continue;
}
if (pToken.TokenPeek.TokenName == TokenParser.Tokens.RPAREN)
{
parens--;
retval = retval + pToken.TokenPeek.TokenValue;
parser.GetToken();
if (parens == 0)
{
break;
}
}
if (pToken.TokenPeek.TokenName == TokenParser.Tokens.COLON && parens == 0)
{
break;
}
parser.SkipWhiteSpace();
parser.GetToken();
parser.SkipWhiteSpace();
pToken = parser.Peek();
}
return(retval);
}
