Ejemplo n.º 1
0
        private Type GetExpressionType <T>(TokenSet set, ParameterExpression parameter, ICollection <ParameterExpression> lambdaParameters)
        {
            if (set == null)
            {
                return(null);
            }

            if (Regex.IsMatch(set.Left, @"^\(.*\)$") && set.Operation.IsCombinationOperation())
            {
                return(null);
            }

            if (set.Left.IsFunction())
            {
                var functionName = set.Left.GetFunctionName();
                if (!string.IsNullOrWhiteSpace(functionName))
                {
                    return(functionName.GetFunctionType());
                }
            }

            var property = GetPropertyExpression <T>(set.Left, parameter, lambdaParameters) ?? GetPropertyExpression <T>(set.Right, parameter, lambdaParameters);

            if (property != null)
            {
                return(property.Type);
            }

            var type = GetExpressionType <T>(set.Left.GetArithmeticToken(), parameter, lambdaParameters);

            return(type ?? GetExpressionType <T>(set.Right.GetArithmeticToken(), parameter, lambdaParameters));
        }
Ejemplo n.º 2
0
        public static ICollection <TokenSet> GetTokens(this string expression)
        {
            var tokens = new Collection <TokenSet>();

            if (string.IsNullOrWhiteSpace(expression))
            {
                return(tokens);
            }

            var cleanMatch = expression.EnclosedMatch();

            if (cleanMatch.Success)
            {
                var match = cleanMatch.Groups[1].Value;
                if (!HasOrphanedOpenParenthesis(match))
                {
                    expression = match;
                }
            }

            if (expression.IsImpliedBoolean())
            {
                return(tokens);
            }

            var blocks = GetBlocks(expression);

            var openGroups      = 0;
            var startExpression = 0;
            var currentTokens   = new TokenSet();

            for (var i = 0; i < blocks.Count; i++)
            {
                var netEnclosed = blocks[i].Count(c => c == '(') - blocks[i].Count(c => c == ')');
                openGroups += netEnclosed;

                if (openGroups == 0)
                {
                    if (blocks[i].IsOperation())
                    {
                        var expression1 = startExpression;

                        if (string.IsNullOrWhiteSpace(currentTokens.Left))
                        {
                            var i1 = i;
                            Func <string, int, bool> leftPredicate = (x, j) => j >= expression1 && j < i1;

                            currentTokens.Left      = string.Join(" ", blocks.Where(leftPredicate));
                            currentTokens.Operation = blocks[i];
                            startExpression         = i + 1;

                            if (blocks[i].IsCombinationOperation())
                            {
                                currentTokens.Right = string.Join(" ", blocks.Where((x, j) => j > i));

                                tokens.Add(currentTokens);
                                return(tokens);
                            }
                        }
                        else
                        {
                            var i2 = i;
                            Func <string, int, bool> rightPredicate = (x, j) => j >= expression1 && j < i2;
                            currentTokens.Right = string.Join(" ", blocks.Where(rightPredicate));

                            tokens.Add(currentTokens);

                            startExpression = i + 1;
                            currentTokens   = new TokenSet();

                            if (blocks[i].IsCombinationOperation())
                            {
                                tokens.Add(new TokenSet {
                                    Operation = blocks[i].ToLowerInvariant()
                                });
                            }
                        }
                    }
                }
            }

            var remainingToken = string.Join(" ", blocks.Where((x, j) => j >= startExpression));

            if (!string.IsNullOrWhiteSpace(currentTokens.Left))
            {
                currentTokens.Right = remainingToken;
                tokens.Add(currentTokens);
            }
            else if (remainingToken.IsEnclosed())
            {
                currentTokens.Left = remainingToken;
                tokens.Add(currentTokens);
            }
            else if (tokens.Count > 0)
            {
                currentTokens.Left = remainingToken;
                tokens.Add(currentTokens);
            }

            return(tokens);
        }