public CharacterClassExpression GetComplement()
        {
            var complementCharacters = _alphabet.GetAllCharacters().Where(x => !_literals.ContainsKey(x)).ToList();
            var complement           = new CharacterClassExpression(_alphabet, _random, _maxInverseLength);

            complement.AddCharacters(complementCharacters);

            return(complement);
        }
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        private IParseResult <ExpressionMetaData> TryGetAnyCharacterExpression(ITokenStream tokenStream, out IExpression expression)
        {
            tokenStream.Pop();

            var characterExpression = new CharacterClassExpression(_alphabet, _random, _maxCharClassInverseLength);

            characterExpression.AddCharacters(_alphabet.GetAllCharacters());

            expression = characterExpression;

            return(new SuccessParseResult <ExpressionMetaData>(tokenStream.CurrentPosition, new ExpressionMetaData()));
        }
        public override IExpression Clone()
        {
            var clone = new CharacterClassExpression(_alphabet, _random, _maxInverseLength)
            {
                RepeatRange     = RepeatRange?.Clone(),
                ExpansionLength = ExpansionLength
            };

            clone.AddCharacters(_characterList);

            return(clone);
        }
 private static void ClassifyListsByLength(CharacterClassExpression charClass1, CharacterClassExpression charClass2, out IDictionary <string, string> shortDict, out IDictionary <string, string> longDict)
 {
     if (charClass1._literals.Count < charClass2._literals.Count)
     {
         shortDict = charClass1._literals;
         longDict  = charClass2._literals;
     }
     else
     {
         shortDict = charClass2._literals;
         longDict  = charClass1._literals;
     }
 }
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        private IParseResult <ExpressionMetaData> TryGetSingleCharacterExpression(ITokenStream tokenStream, out IExpression expression)
        {
            expression = null;
            var tokenValue = tokenStream.Pop().GetValue <string>();
            var characterClassExpression = new CharacterClassExpression(_alphabet, _random, _maxCharClassInverseLength);

            characterClassExpression.AddCharacters(new List <string> {
                tokenValue
            });

            expression = characterClassExpression;

            return(new SuccessParseResult <ExpressionMetaData>(tokenStream.CurrentPosition, new ExpressionMetaData()));
        }
        public CharacterClassExpression GetUnion(CharacterClassExpression charClass)
        {
            var union = new CharacterClassExpression(_alphabet, _random, _maxInverseLength)
            {
                RepeatRange = RepeatRange
            };

            union.AddCharacters(_characterList);

            if (charClass != null)
            {
                union.AddCharacters(charClass._characterList);
            }

            return(union);
        }
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        private IParseResult <ExpressionMetaData> TryGetCharacterClassExpression(ITokenStream tokenStream, out IExpression expression)
        {
            expression = null;

            var nextTokenType = tokenStream.Pop().GetType <RegexTokenType>();

            var getComplement = nextTokenType == RegexTokenType.OpenNegateCharacterClass;

            nextTokenType = tokenStream.LookAhead(0).GetType <RegexTokenType>();

            var characters = new List <string>();

            while (nextTokenType == RegexTokenType.Character || nextTokenType == RegexTokenType.CharacterRange)
            {
                var nextToken = tokenStream.Pop();

                if (nextToken.GetType <RegexTokenType>() == RegexTokenType.Character)
                {
                    characters.Add(nextToken.GetValue <string>());
                }
                else
                {
                    characters.AddRange(nextToken.GetValue <CharacterRange>().Characters);
                }

                nextTokenType = tokenStream.LookAhead(0).GetType <RegexTokenType>();
            }

            if (nextTokenType != RegexTokenType.CloseCharacterClass)
            {
                return(new FailureParseResult <ExpressionMetaData>(tokenStream.CurrentPosition, RegSeedErrorType.CloseCharacterClassExpected));
            }

            tokenStream.Pop();

            var characterClassExpression = new CharacterClassExpression(_alphabet, _random, _maxCharClassInverseLength);

            characterClassExpression.AddCharacters(characters);

            expression = getComplement ? characterClassExpression.GetComplement() : characterClassExpression;
            return(new SuccessParseResult <ExpressionMetaData>(tokenStream.CurrentPosition, new ExpressionMetaData()));
        }
        private UnionExpression GetAllCharacterClassInversesUpToMaxInverseLength()
        {
            var minimalLengthTwoRange = new IntegerInterval();

            minimalLengthTwoRange.TrySetValue(2, _maxInverseLength);

            var atLeastLengthTwoWords = new CharacterClassExpression(_alphabet, _random, _maxInverseLength)
            {
                RepeatRange = minimalLengthTwoRange
            };

            atLeastLengthTwoWords.AddCharacters(_alphabet.GetAllCharacters());

            var inverseExpressions = new List <IExpression>
            {
                GetComplement(),
                atLeastLengthTwoWords
            };

            return(new UnionExpression(inverseExpressions, _random));
        }
        public CharacterClassExpression GetIntersection(CharacterClassExpression charClass)
        {
            if (charClass == null || !charClass._characterList.Any() || !_characterList.Any())
            {
                return(new CharacterClassExpression(_alphabet, _random, _maxInverseLength));
            }

            ClassifyListsByLength(this, charClass, out var shortDict, out var longDict);

            var intersectList = shortDict.Where(x => longDict.ContainsKey(x.Key))
                                .Select(y => y.Key)
                                .ToList();

            var intersection = new CharacterClassExpression(_alphabet, _random, _maxInverseLength)
            {
                RepeatRange = RepeatRange
            };

            intersection.AddCharacters(intersectList);

            return(intersection);
        }