public void Setup() {
this._letterOrDigit = Prims.LetterOrDigit;
this._letterOrDigit.Act += OnLetterOrDigitParserSuccess;
this._letter = Prims.Letter;
this._letter.Act += OnLetterParserSuccess;
this._symbol = Prims.Symbol;
this._symbol.Act += OnSymbolParserSuccess;
this._LetterOrDigitButNotLetterDifferenceParser = new DifferenceParser(this._letterOrDigit, this._letter);
this._LetterOrDigitButNotLetterDifferenceParser.Act += OnDifferenceParserSuccess;
this._symbolParserSuccess = false;
this._letterParserSuccess = false;
this._letterOrDigitParserSuccess = false;
this._differenceParserSuccess = false;
}
public void InputMatchesFirstParserAndSecondParser_SecondParserShorter_Success()
{
IScanner letter = new StringScanner("abc");
DifferenceParser parser = new DifferenceParser(Ops.Sequence(this._letterOrDigit, this._letterOrDigit),
this._letterOrDigit);
Assert.IsTrue(parser.Parse(letter).Success);
}
public void InputMatchesFirstParserAndSecondParser_SecondParserLonger_Fail()
{
IScanner letter = new StringScanner("abc");
DifferenceParser parser = new DifferenceParser(this._letterOrDigit,
Ops.Sequence(this._letterOrDigit, this._letterOrDigit));
Assert.IsFalse(parser.Parse(letter).Success);
}
public void DifferenceParser()
{
DifferenceParser parser = new DifferenceParser(this._letterOrDigit, this._symbol);
Assert.AreEqual(this._letterOrDigit, parser.FirstParser);
Assert.AreEqual(this._symbol, parser.SecondParser);
}
public void InputDoesNotMatchFirstParserButMatchesSecondParser_ScanPosition_NoChange()
{
IScanner symbol = new StringScanner("+hello");
DifferenceParser parser = new DifferenceParser(this._letterOrDigit, this._symbol);
parser.Parse(symbol);
Assert.AreEqual(0, symbol.Offset);
}
public void InputDoesNotMatchFirstParserButMatchesSecondParser_Actions_None()
{
IScanner symbol = new StringScanner("+");
DifferenceParser parser = new DifferenceParser(this._letterOrDigit, this._symbol);
parser.Act += OnDifferenceParserSuccess;
parser.Parse(symbol);
Assert.IsFalse(_differenceParserSuccess);
Assert.IsFalse(_letterOrDigitParserSuccess);
Assert.IsFalse(_symbolParserSuccess); // should never call since first parser doesn't match
}
public void InputDoesNotMatchFirstParserButMatchesSecondParser_Fail()
{
IScanner symbol = new StringScanner("+");
DifferenceParser parser = new DifferenceParser(this._letterOrDigit, this._symbol);
parser.Act += OnDifferenceParserSuccess;
Assert.IsFalse(parser.Parse(symbol).Success);
}
