public bool TryGet(IExpectPattern pattern, out string result)
{
return(TryWrapper(() =>
{
Expect(pattern);
}, out result));
}
private StringScannerEngine ExpectImpl(IExpectPattern pattern)
{
AssertNotFinished();
CachePos();
AutoSkipWhitespace();
int startPos = Index;
pattern.Initialize(Index, Chars);
// call the function one more time after the end of the string - this determines outcome
if (pattern.Validate())
{
Match = pattern.Result;
NewPos(pattern.EndIndex);
}
else
{
Index = pattern.EndIndex; // for error report to be accurate - will be undone at end
ThrowUnexpectedCharacterException();
}
return(this);
}
/// <summary>
/// Continue seeking as long as the delegate returns true.
/// </summary>
///
/// <param name="pattern">
/// A class specifying the pattern to match.
/// </param>
///
/// <returns>
/// The string scanner.
/// </returns>
public IStringScanner Expect(IExpectPattern pattern)
{
ExpectImpl(pattern);
return(this);
}
public string Get(IExpectPattern pattern)
{
ExpectImpl(pattern);
return(Match);
}
