// If culture is null, CurrentThread.CurrentCulture will be used when necessary. public static FilterCriterion Parse(string expression, Type dataType, CultureInfo culture) { List <Token> tokens = FilterParser.GetTokens(expression, dataType); return(FilterParser.BuildCriterion(tokens, dataType, FilterParser.GetDefaultCriterionType(dataType), culture)); }
private static FilterCriterion BuildCriterion(List <Token> tokens, Type dataType, Type defaultCriterionType, CultureInfo culture) { FilterCriterion filterCriterion = null; ReferenceList <FilterCriterion> initializedCriteria = new ReferenceList <FilterCriterion>(); List <int> precedences = new List <int>(); FilterParser.FillPrecedenceList(precedences); for (int index = 0; index < precedences.Count; index++) { int curOperatorPrecedence = precedences[index]; foreach (Type type in FilterParser.RegisteredFilterCriterionTypes) { CriterionDescriptorAttribute attribute = ( CriterionDescriptorAttribute )type.GetCustomAttributes(typeof(CriterionDescriptorAttribute), true)[0]; if (( int )attribute.OperatorPrecedence == curOperatorPrecedence) { if (!string.IsNullOrEmpty(attribute.Pattern)) { bool tokenConsumed; do { tokenConsumed = false; for (int i = 0; i < tokens.Count; i++) { FilterCriterionToken filterToken = tokens[i] as FilterCriterionToken; if ((filterToken != null) && (filterToken.FilterCriterion.GetType() == type) && (!initializedCriteria.Contains(filterToken.FilterCriterion))) { List <object> parameters = new List <object>(); if (attribute.Pattern.StartsWith("@")) { if (i <= 0) { throw new DataGridException(string.Format(FilterParser.MissingLeftOperandErrorText, type.Name)); } if (tokens[i - 1] is ValueToken) { FilterParser.AddValueToParameters(parameters, ( ValueToken )tokens[i - 1], dataType, culture); } else { parameters.Add((( FilterCriterionToken )tokens[i - 1]).FilterCriterion); } tokens.RemoveAt(i - 1); i--; } if (attribute.Pattern.EndsWith("@")) { if (i + 1 >= tokens.Count) { throw new DataGridException(string.Format(FilterParser.MissingRightOperandErrorText, type.Name)); } if (tokens[i + 1] is ValueToken) { FilterParser.AddValueToParameters(parameters, ( ValueToken )tokens[i + 1], dataType, culture); } else { parameters.Add((( FilterCriterionToken )tokens[i + 1]).FilterCriterion); } tokens.RemoveAt(i + 1); i--; } filterToken.FilterCriterion.InitializeFrom(parameters.ToArray(), defaultCriterionType); initializedCriteria.Add(filterToken.FilterCriterion); tokenConsumed = true; break; } } }while(tokenConsumed); } else { if (type != typeof(ContainsFilterCriterion)) { throw new DataGridInternalException("Missing pattern in attribute: " + type.Name); } } } } } if ((tokens.Count == 1) && (tokens[0] is FilterCriterionToken)) { filterCriterion = (( FilterCriterionToken )tokens[0]).FilterCriterion; } else { throw new DataGridException(FilterParser.InvalidExpressionErrorText); } return(filterCriterion); }