1 | // Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team |
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2 | // |
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3 | // Permission is hereby granted, free of charge, to any person obtaining a copy of this |
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4 | // software and associated documentation files (the "Software"), to deal in the Software |
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5 | // without restriction, including without limitation the rights to use, copy, modify, merge, |
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6 | // publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons |
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7 | // to whom the Software is furnished to do so, subject to the following conditions: |
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8 | // |
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9 | // The above copyright notice and this permission notice shall be included in all copies or |
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10 | // substantial portions of the Software. |
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11 | // |
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12 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
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13 | // INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR |
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14 | // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE |
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15 | // FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
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16 | // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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17 | // DEALINGS IN THE SOFTWARE. |
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18 | |
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19 | using System; |
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20 | using System.Collections.Generic; |
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21 | using System.Diagnostics; |
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22 | using System.Globalization; |
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23 | using System.Linq; |
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24 | using System.Text; |
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25 | using ICSharpCode.NRefactory.PatternMatching; |
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26 | |
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27 | namespace ICSharpCode.NRefactory.CSharp { |
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28 | public class QueryExpressionExpansionResult { |
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29 | public AstNode AstNode { get; private set; } |
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30 | |
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31 | /// <summary> |
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32 | /// Maps original range variables to some node in the new tree that represents them. |
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33 | /// </summary> |
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34 | public IDictionary<Identifier, AstNode> RangeVariables { get; private set; } |
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35 | |
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36 | /// <summary> |
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37 | /// Maps clauses to method calls. The keys will always be either a <see cref="QueryClause"/> or a <see cref="QueryOrdering"/> |
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38 | /// </summary> |
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39 | public IDictionary<AstNode, Expression> Expressions { get; private set; } |
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40 | |
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41 | public QueryExpressionExpansionResult(AstNode astNode, IDictionary<Identifier, AstNode> rangeVariables, IDictionary<AstNode, Expression> expressions) { |
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42 | AstNode = astNode; |
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43 | RangeVariables = rangeVariables; |
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44 | Expressions = expressions; |
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45 | } |
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46 | } |
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47 | |
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48 | public class QueryExpressionExpander { |
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49 | class Visitor : DepthFirstAstVisitor<AstNode> { |
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50 | internal IEnumerator<string> TransparentIdentifierNamePicker; |
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51 | |
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52 | protected override AstNode VisitChildren(AstNode node) { |
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53 | List<AstNode> newChildren = null; |
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54 | |
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55 | int i = 0; |
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56 | foreach (var child in node.Children) { |
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57 | var newChild = child.AcceptVisitor(this); |
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58 | if (newChild != null) { |
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59 | newChildren = newChildren ?? Enumerable.Repeat((AstNode)null, i).ToList(); |
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60 | newChildren.Add(newChild); |
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61 | } |
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62 | else if (newChildren != null) { |
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63 | newChildren.Add(null); |
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64 | } |
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65 | i++; |
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66 | } |
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67 | |
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68 | if (newChildren == null) |
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69 | return null; |
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70 | |
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71 | var result = node.Clone(); |
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72 | |
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73 | i = 0; |
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74 | foreach (var children in result.Children) { |
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75 | if (newChildren[i] != null) |
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76 | children.ReplaceWith(newChildren[i]); |
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77 | i++; |
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78 | } |
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79 | |
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80 | return result; |
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81 | } |
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82 | |
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83 | Expression MakeNestedMemberAccess(Expression target, IEnumerable<string> members) { |
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84 | return members.Aggregate(target, (current, m) => current.Member(m)); |
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85 | } |
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86 | |
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87 | Expression VisitNested(Expression node, ParameterDeclaration transparentParameter) { |
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88 | var oldRangeVariableSubstitutions = activeRangeVariableSubstitutions; |
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89 | try { |
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90 | if (transparentParameter != null && currentTransparentType.Count > 1) { |
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91 | activeRangeVariableSubstitutions = new Dictionary<string, Expression>(activeRangeVariableSubstitutions); |
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92 | foreach (var t in currentTransparentType) |
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93 | activeRangeVariableSubstitutions[t.Item1.Name] = MakeNestedMemberAccess(new IdentifierExpression(transparentParameter.Name), t.Item2); |
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94 | } |
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95 | var result = node.AcceptVisitor(this); |
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96 | return (Expression)(result ?? node.Clone()); |
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97 | } |
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98 | finally { |
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99 | activeRangeVariableSubstitutions = oldRangeVariableSubstitutions; |
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100 | } |
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101 | } |
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102 | |
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103 | QueryClause GetNextQueryClause(QueryClause clause) { |
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104 | for (AstNode node = clause.NextSibling; node != null; node = node.NextSibling) { |
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105 | if (node.Role == QueryExpression.ClauseRole) |
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106 | return (QueryClause)node; |
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107 | } |
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108 | return null; |
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109 | } |
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110 | |
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111 | public IDictionary<Identifier, AstNode> rangeVariables = new Dictionary<Identifier, AstNode>(); |
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112 | public IDictionary<AstNode, Expression> expressions = new Dictionary<AstNode, Expression>(); |
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113 | |
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114 | Dictionary<string, Expression> activeRangeVariableSubstitutions = new Dictionary<string, Expression>(); |
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115 | List<Tuple<Identifier, List<string>>> currentTransparentType = new List<Tuple<Identifier, List<string>>>(); |
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116 | Expression currentResult; |
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117 | bool eatSelect; |
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118 | |
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119 | void MapExpression(AstNode orig, Expression newExpr) { |
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120 | Debug.Assert(orig is QueryClause || orig is QueryOrdering); |
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121 | expressions[orig] = newExpr; |
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122 | } |
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123 | |
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124 | internal static IEnumerable<string> FallbackTransparentIdentifierNamePicker() |
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125 | { |
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126 | const string TransparentParameterNameTemplate = "x{0}"; |
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127 | int currentTransparentParameter = 0; |
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128 | for (;;) { |
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129 | yield return string.Format(CultureInfo.InvariantCulture, TransparentParameterNameTemplate, currentTransparentParameter++); |
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130 | } |
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131 | } |
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132 | |
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133 | ParameterDeclaration CreateParameterForCurrentRangeVariable() { |
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134 | var param = new ParameterDeclaration(); |
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135 | |
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136 | if (currentTransparentType.Count == 1) { |
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137 | var clonedRangeVariable = (Identifier)currentTransparentType[0].Item1.Clone(); |
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138 | if (!rangeVariables.ContainsKey(currentTransparentType[0].Item1)) |
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139 | rangeVariables[currentTransparentType[0].Item1] = param; |
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140 | param.AddChild(clonedRangeVariable, Roles.Identifier); |
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141 | } |
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142 | else { |
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143 | if (!TransparentIdentifierNamePicker.MoveNext()) { |
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144 | TransparentIdentifierNamePicker = FallbackTransparentIdentifierNamePicker().GetEnumerator(); |
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145 | TransparentIdentifierNamePicker.MoveNext(); |
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146 | } |
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147 | string name = TransparentIdentifierNamePicker.Current; |
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148 | param.AddChild(Identifier.Create(name), Roles.Identifier); |
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149 | } |
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150 | return param; |
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151 | } |
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152 | |
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153 | LambdaExpression CreateLambda(IList<ParameterDeclaration> parameters, Expression body) { |
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154 | var result = new LambdaExpression(); |
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155 | if (parameters.Count > 1) |
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156 | result.AddChild(new CSharpTokenNode(TextLocation.Empty, Roles.LPar), Roles.LPar); |
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157 | result.AddChild(parameters[0], Roles.Parameter); |
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158 | for (int i = 1; i < parameters.Count; i++) { |
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159 | result.AddChild(new CSharpTokenNode(TextLocation.Empty, Roles.Comma), Roles.Comma); |
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160 | result.AddChild(parameters[i], Roles.Parameter); |
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161 | } |
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162 | if (parameters.Count > 1) |
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163 | result.AddChild(new CSharpTokenNode(TextLocation.Empty, Roles.RPar), Roles.RPar); |
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164 | result.AddChild(body, LambdaExpression.BodyRole); |
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165 | |
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166 | return result; |
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167 | } |
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168 | |
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169 | ParameterDeclaration CreateParameter(Identifier identifier) { |
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170 | var result = new ParameterDeclaration(); |
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171 | result.AddChild(identifier, Roles.Identifier); |
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172 | return result; |
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173 | } |
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174 | |
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175 | Expression AddMemberToCurrentTransparentType(ParameterDeclaration param, Identifier name, Expression value, bool namedExpression) { |
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176 | Expression newAssignment = VisitNested(value, param); |
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177 | if (namedExpression) { |
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178 | newAssignment = new NamedExpression(name.Name, VisitNested(value, param)); |
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179 | if (!rangeVariables.ContainsKey(name) ) |
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180 | rangeVariables[name] = ((NamedExpression)newAssignment).NameToken; |
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181 | } |
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182 | |
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183 | foreach (var t in currentTransparentType) |
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184 | t.Item2.Insert(0, param.Name); |
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185 | |
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186 | currentTransparentType.Add(Tuple.Create(name, new List<string> { name.Name })); |
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187 | return new AnonymousTypeCreateExpression(new[] { new IdentifierExpression(param.Name), newAssignment }); |
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188 | } |
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189 | |
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190 | void AddFirstMemberToCurrentTransparentType(Identifier identifier) { |
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191 | Debug.Assert(currentTransparentType.Count == 0); |
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192 | currentTransparentType.Add(Tuple.Create(identifier, new List<string>())); |
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193 | } |
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194 | |
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195 | public override AstNode VisitQueryExpression(QueryExpression queryExpression) { |
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196 | var oldTransparentType = currentTransparentType; |
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197 | var oldResult = currentResult; |
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198 | var oldEatSelect = eatSelect; |
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199 | try { |
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200 | currentTransparentType = new List<Tuple<Identifier, List<string>>>(); |
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201 | currentResult = null; |
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202 | eatSelect = false; |
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203 | |
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204 | foreach (var clause in queryExpression.Clauses) { |
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205 | var result = (Expression)clause.AcceptVisitor(this); |
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206 | MapExpression(clause, result ?? currentResult); |
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207 | currentResult = result; |
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208 | } |
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209 | |
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210 | return currentResult; |
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211 | } |
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212 | finally { |
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213 | currentTransparentType = oldTransparentType; |
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214 | currentResult = oldResult; |
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215 | eatSelect = oldEatSelect; |
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216 | } |
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217 | } |
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218 | |
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219 | public override AstNode VisitQueryContinuationClause(QueryContinuationClause queryContinuationClause) { |
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220 | var prev = VisitNested(queryContinuationClause.PrecedingQuery, null); |
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221 | AddFirstMemberToCurrentTransparentType(queryContinuationClause.IdentifierToken); |
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222 | return prev; |
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223 | } |
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224 | |
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225 | static bool NeedsToBeParenthesized(Expression expr) |
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226 | { |
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227 | UnaryOperatorExpression unary = expr as UnaryOperatorExpression; |
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228 | if (unary != null) { |
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229 | if (unary.Operator == UnaryOperatorType.PostIncrement || unary.Operator == UnaryOperatorType.PostDecrement) { |
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230 | return false; |
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231 | } |
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232 | return true; |
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233 | } |
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234 | |
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235 | if (expr is BinaryOperatorExpression || expr is ConditionalExpression || expr is AssignmentExpression) { |
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236 | return true; |
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237 | } |
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238 | |
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239 | return false; |
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240 | } |
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241 | |
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242 | static Expression ParenthesizeIfNeeded(Expression expr) |
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243 | { |
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244 | return NeedsToBeParenthesized(expr) ? new ParenthesizedExpression(expr.Clone()) : expr; |
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245 | } |
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246 | |
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247 | public override AstNode VisitQueryFromClause(QueryFromClause queryFromClause) { |
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248 | if (currentResult == null) { |
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249 | AddFirstMemberToCurrentTransparentType(queryFromClause.IdentifierToken); |
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250 | if (queryFromClause.Type.IsNull) { |
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251 | return VisitNested(ParenthesizeIfNeeded(queryFromClause.Expression), null); |
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252 | } |
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253 | else { |
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254 | return VisitNested(ParenthesizeIfNeeded(queryFromClause.Expression), null).Invoke("Cast", new[] { queryFromClause.Type.Clone() }, new Expression[0]); |
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255 | } |
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256 | } |
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257 | else { |
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258 | var innerSelectorParam = CreateParameterForCurrentRangeVariable(); |
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259 | var lambdaContent = VisitNested(queryFromClause.Expression, innerSelectorParam); |
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260 | if (!queryFromClause.Type.IsNull) { |
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261 | lambdaContent = lambdaContent.Invoke("Cast", new[] { queryFromClause.Type.Clone() }, new Expression[0]); |
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262 | } |
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263 | var innerSelector = CreateLambda(new[] { innerSelectorParam }, lambdaContent); |
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264 | |
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265 | var clonedIdentifier = (Identifier)queryFromClause.IdentifierToken.Clone(); |
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266 | |
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267 | var resultParam = CreateParameterForCurrentRangeVariable(); |
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268 | Expression body; |
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269 | // Second from clause - SelectMany |
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270 | var select = GetNextQueryClause(queryFromClause) as QuerySelectClause; |
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271 | if (select != null) { |
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272 | body = VisitNested(select.Expression, resultParam); |
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273 | eatSelect = true; |
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274 | } |
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275 | else { |
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276 | body = AddMemberToCurrentTransparentType(resultParam, queryFromClause.IdentifierToken, new IdentifierExpression(queryFromClause.Identifier), false); |
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277 | } |
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278 | |
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279 | var resultSelectorParam2 = CreateParameter(clonedIdentifier); |
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280 | var resultSelector = CreateLambda(new[] { resultParam, resultSelectorParam2 }, body); |
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281 | rangeVariables[queryFromClause.IdentifierToken] = resultSelectorParam2; |
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282 | |
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283 | return currentResult.Invoke("SelectMany", innerSelector, resultSelector); |
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284 | } |
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285 | } |
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286 | |
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287 | public override AstNode VisitQueryLetClause(QueryLetClause queryLetClause) { |
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288 | var param = CreateParameterForCurrentRangeVariable(); |
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289 | var body = AddMemberToCurrentTransparentType(param, queryLetClause.IdentifierToken, queryLetClause.Expression, true); |
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290 | var lambda = CreateLambda(new[] { param }, body); |
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291 | |
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292 | return currentResult.Invoke("Select", lambda); |
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293 | } |
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294 | |
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295 | public override AstNode VisitQueryWhereClause(QueryWhereClause queryWhereClause) { |
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296 | var param = CreateParameterForCurrentRangeVariable(); |
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297 | return currentResult.Invoke("Where", CreateLambda(new[] { param }, VisitNested(queryWhereClause.Condition, param))); |
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298 | } |
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299 | |
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300 | public override AstNode VisitQueryJoinClause(QueryJoinClause queryJoinClause) { |
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301 | Expression resultSelectorBody = null; |
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302 | var inExpression = VisitNested(queryJoinClause.InExpression, null); |
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303 | if (!queryJoinClause.Type.IsNull) { |
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304 | inExpression = inExpression.Invoke("Cast", new[] { queryJoinClause.Type.Clone() }, EmptyList<Expression>.Instance); |
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305 | } |
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306 | var key1SelectorFirstParam = CreateParameterForCurrentRangeVariable(); |
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307 | var key1Selector = CreateLambda(new[] { key1SelectorFirstParam }, VisitNested(queryJoinClause.OnExpression, key1SelectorFirstParam)); |
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308 | var key2Param = CreateParameter(Identifier.Create(queryJoinClause.JoinIdentifier)); |
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309 | var key2Selector = CreateLambda(new[] { key2Param }, VisitNested(queryJoinClause.EqualsExpression, null)); |
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310 | |
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311 | var resultSelectorFirstParam = CreateParameterForCurrentRangeVariable(); |
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312 | |
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313 | var select = GetNextQueryClause(queryJoinClause) as QuerySelectClause; |
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314 | if (select != null) { |
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315 | resultSelectorBody = VisitNested(select.Expression, resultSelectorFirstParam); |
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316 | eatSelect = true; |
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317 | } |
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318 | |
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319 | if (queryJoinClause.IntoKeyword.IsNull) { |
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320 | // Normal join |
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321 | if (resultSelectorBody == null) |
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322 | resultSelectorBody = AddMemberToCurrentTransparentType(resultSelectorFirstParam, queryJoinClause.JoinIdentifierToken, new IdentifierExpression(queryJoinClause.JoinIdentifier), false); |
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323 | |
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324 | var resultSelector = CreateLambda(new[] { resultSelectorFirstParam, CreateParameter(Identifier.Create(queryJoinClause.JoinIdentifier)) }, resultSelectorBody); |
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325 | rangeVariables[queryJoinClause.JoinIdentifierToken] = key2Param; |
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326 | return currentResult.Invoke("Join", inExpression, key1Selector, key2Selector, resultSelector); |
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327 | } |
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328 | else { |
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329 | // Group join |
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330 | if (resultSelectorBody == null) |
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331 | resultSelectorBody = AddMemberToCurrentTransparentType(resultSelectorFirstParam, queryJoinClause.IntoIdentifierToken, new IdentifierExpression(queryJoinClause.IntoIdentifier), false); |
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332 | |
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333 | var intoParam = CreateParameter(Identifier.Create(queryJoinClause.IntoIdentifier)); |
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334 | var resultSelector = CreateLambda(new[] { resultSelectorFirstParam, intoParam }, resultSelectorBody); |
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335 | rangeVariables[queryJoinClause.IntoIdentifierToken] = intoParam; |
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336 | |
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337 | return currentResult.Invoke("GroupJoin", inExpression, key1Selector, key2Selector, resultSelector); |
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338 | } |
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339 | } |
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340 | |
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341 | public override AstNode VisitQueryOrderClause(QueryOrderClause queryOrderClause) { |
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342 | var current = currentResult; |
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343 | bool first = true; |
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344 | foreach (var o in queryOrderClause.Orderings) { |
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345 | string methodName = first ? (o.Direction == QueryOrderingDirection.Descending ? "OrderByDescending" : "OrderBy") |
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346 | : (o.Direction == QueryOrderingDirection.Descending ? "ThenByDescending" : "ThenBy"); |
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347 | |
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348 | var param = CreateParameterForCurrentRangeVariable(); |
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349 | current = current.Invoke(methodName, CreateLambda(new[] { param }, VisitNested(o.Expression, param))); |
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350 | MapExpression(o, current); |
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351 | first = false; |
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352 | } |
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353 | return current; |
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354 | } |
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355 | |
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356 | bool IsSingleRangeVariable(Expression expr) { |
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357 | if (currentTransparentType.Count > 1) |
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358 | return false; |
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359 | var unpacked = ParenthesizedExpression.UnpackParenthesizedExpression(expr); |
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360 | return unpacked is IdentifierExpression && ((IdentifierExpression)unpacked).Identifier == currentTransparentType[0].Item1.Name; |
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361 | } |
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362 | |
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363 | public override AstNode VisitQuerySelectClause(QuerySelectClause querySelectClause) { |
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364 | if (eatSelect) { |
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365 | eatSelect = false; |
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366 | return currentResult; |
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367 | } |
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368 | else if (((QueryExpression)querySelectClause.Parent).Clauses.Count > 2 && IsSingleRangeVariable(querySelectClause.Expression)) { |
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369 | // A simple query that ends with a trivial select should be removed. |
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370 | return currentResult; |
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371 | } |
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372 | |
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373 | var param = CreateParameterForCurrentRangeVariable(); |
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374 | var lambda = CreateLambda(new[] { param }, VisitNested(querySelectClause.Expression, param)); |
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375 | return currentResult.Invoke("Select", lambda); |
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376 | } |
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377 | |
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378 | public override AstNode VisitQueryGroupClause(QueryGroupClause queryGroupClause) { |
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379 | var param = CreateParameterForCurrentRangeVariable(); |
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380 | var keyLambda = CreateLambda(new[] { param }, VisitNested(queryGroupClause.Key, param)); |
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381 | |
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382 | if (IsSingleRangeVariable(queryGroupClause.Projection)) { |
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383 | // We are grouping by the single active range variable, so we can use the single argument form of GroupBy |
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384 | return currentResult.Invoke("GroupBy", keyLambda); |
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385 | } |
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386 | else { |
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387 | var projectionParam = CreateParameterForCurrentRangeVariable(); |
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388 | var projectionLambda = CreateLambda(new[] { projectionParam }, VisitNested(queryGroupClause.Projection, projectionParam)); |
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389 | return currentResult.Invoke("GroupBy", keyLambda, projectionLambda); |
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390 | } |
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391 | } |
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392 | |
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393 | public override AstNode VisitIdentifierExpression(IdentifierExpression identifierExpression) { |
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394 | Expression subst; |
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395 | activeRangeVariableSubstitutions.TryGetValue(identifierExpression.Identifier, out subst); |
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396 | return subst != null ? subst.Clone() : null; |
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397 | } |
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398 | } |
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399 | |
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400 | /// <summary> |
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401 | /// Expands all occurances of query patterns in the specified node. Returns a clone of the node with all query patterns expanded, or null if there was no query pattern to expand. |
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402 | /// </summary> |
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403 | /// <param name="node"></param> |
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404 | /// <param name="transparentIdentifierNamePicker">A sequence of names to use for transparent identifiers. Once the sequence is over, a fallback name generator is used</param> |
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405 | /// <returns></returns> |
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406 | public QueryExpressionExpansionResult ExpandQueryExpressions(AstNode node, IEnumerable<string> transparentIdentifierNamePicker) { |
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407 | var visitor = new Visitor(); |
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408 | visitor.TransparentIdentifierNamePicker = transparentIdentifierNamePicker.GetEnumerator(); |
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409 | var astNode = node.AcceptVisitor(visitor); |
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410 | if (astNode != null) { |
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411 | astNode.Freeze(); |
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412 | return new QueryExpressionExpansionResult(astNode, visitor.rangeVariables, visitor.expressions); |
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413 | } |
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414 | else { |
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415 | return null; |
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416 | } |
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417 | } |
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418 | |
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419 | |
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420 | /// <summary> |
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421 | /// Expands all occurances of query patterns in the specified node. Returns a clone of the node with all query patterns expanded, or null if there was no query pattern to expand. |
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422 | /// </summary> |
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423 | /// <param name="node"></param> |
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424 | /// <returns></returns> |
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425 | public QueryExpressionExpansionResult ExpandQueryExpressions(AstNode node) |
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426 | { |
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427 | return ExpandQueryExpressions(node, Enumerable.Empty<string>()); |
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428 | } |
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429 | } |
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430 | } |
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