static int ExtractToken(string fullExpression, string tokenBegin, Token token)
{
// Cant find opening Parentheses
if (tokenBegin[1] != '(')
{
throw new InvalidDataContractException(SRClient.ExpressionMissingOpenParentheses(fullExpression, tokenBegin));
}
int indexOfClose = tokenBegin.IndexOf(')');
int indexOfComma = tokenBegin.IndexOf(',');
int indexOfDefaultBegin = tokenBegin.IndexOf(":{", StringComparison.InvariantCultureIgnoreCase);
int indexOfDefaultEnd = indexOfDefaultBegin + 2;
int defaultFullLength = 0;
// Here we 'read' default value which may contain any character
if (indexOfDefaultBegin > 1 && indexOfDefaultBegin < indexOfClose)
{
if (indexOfDefaultBegin < 3)
{
throw new InvalidDataContractException(SRClient.ExpressionMissingProperty(fullExpression, tokenBegin));
}
var escape = false;
while (true)
{
if (indexOfDefaultEnd >= tokenBegin.Length)
{
throw new InvalidDataContractException(SRClient.ExpressionMissingDefaultEnd(fullExpression, tokenBegin));
}
if (tokenBegin[indexOfDefaultEnd] == '}' && !escape)
{
break;
}
escape = tokenBegin[indexOfDefaultEnd] == '\\' && !escape;
indexOfDefaultEnd++;
}
defaultFullLength = indexOfDefaultEnd - indexOfDefaultBegin + 1;
token.DefaultValue = tokenBegin.Substring(indexOfDefaultBegin + 2, defaultFullLength - 3);
// Fix indexes if default value contains ')' or ','
indexOfComma = tokenBegin.IndexOf(',', indexOfDefaultEnd);
indexOfClose = tokenBegin.IndexOf(')', indexOfDefaultEnd);
}
// Cant find closing Parentheses
if (indexOfClose == -1)
{
throw new InvalidDataContractException(SRClient.ExpressionMissingClosingParentheses(fullExpression, tokenBegin));
}
// When percentage or hash is used comma is prohibited
if ((token.Type == TokenType.Percentage || token.Type == TokenType.Hash) && indexOfComma != -1 && indexOfComma < indexOfClose)
{
throw new InvalidDataContractException(SRClient.ExpressionErrorParsePercentFormat(fullExpression, tokenBegin));
}
// When dot is used comma is mandatory
if (token.Type == TokenType.Dot && indexOfComma == -1)
{
throw new InvalidDataContractException(SRClient.ExpressionErrorParseDotFormat(fullExpression, tokenBegin));
}
int shortLength = 0;
if (indexOfComma != -1 && indexOfComma < indexOfClose)
{
string shortLengthString = tokenBegin.Substring(indexOfComma + 1, indexOfClose - indexOfComma - 1);
if (!int.TryParse(shortLengthString, out shortLength) || shortLength < 0)
{
throw new InvalidDataContractException(SRClient.ExpressionIsNotPositiveInteger(fullExpression, tokenBegin, shortLengthString));
}
if (shortLength == 0)
{
token.EmptyString = true;
}
token.Length = shortLength;
token.Property = tokenBegin.Substring(2, indexOfComma - 2 - defaultFullLength);
}
else
{
token.Property = tokenBegin.Substring(2, indexOfClose - 2 - defaultFullLength);
}
token.Property = token.Property.Trim();
return(indexOfClose);
}
