1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
//
// IterateViaForeachTests.cs
//
// Author:
// Simon Lindgren <simon.n.lindgren@gmail.com>
//
// Copyright (c) 2012 Simon Lindgren
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using ICSharpCode.NRefactory.CSharp.Refactoring;
using ICSharpCode.NRefactory.TypeSystem;
using System.Collections.Generic;
using ICSharpCode.NRefactory.Semantics;
using System.Linq;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction("Iterate via foreach", Description = "Iterates an IEnumerable with a foreach loop.")]
public class IterateViaForeachAction : ICodeActionProvider
{
#region ICodeActionProvider implementation
public IEnumerable<CodeAction> GetActions(RefactoringContext context)
{
CodeAction action;
action = ActionFromUsingStatement(context);
if (action != null)
yield return action;
action = ActionFromVariableInitializer(context);
if (action != null)
yield return action;
action = ActionFromExpressionStatement(context);
if (action != null)
yield return action;
}
CodeAction ActionFromUsingStatement(RefactoringContext context)
{
var initializer = context.GetNode<VariableInitializer>();
if (initializer == null)
return null;
var initializerRR = context.Resolve(initializer) as LocalResolveResult;
if (initializerRR == null)
return null;
var elementType = GetElementType(initializerRR, context);
if (elementType == null)
return null;
var usingStatement = initializer.Parent.Parent as UsingStatement;
if (usingStatement == null)
return null;
return new CodeAction(context.TranslateString("Iterate via foreach"), script => {
var iterator = MakeForeach(new IdentifierExpression(initializer.Name), elementType, context);
if (usingStatement.EmbeddedStatement is EmptyStatement) {
var blockStatement = new BlockStatement();
blockStatement.Statements.Add(iterator);
script.Replace(usingStatement.EmbeddedStatement, blockStatement);
script.FormatText((AstNode)blockStatement);
} else if (usingStatement.EmbeddedStatement is BlockStatement) {
var anchorNode = usingStatement.EmbeddedStatement.FirstChild;
script.InsertAfter(anchorNode, iterator);
script.FormatText(usingStatement.EmbeddedStatement);
}
}, initializer);
}
CodeAction ActionFromVariableInitializer(RefactoringContext context)
{
var initializer = context.GetNode<VariableInitializer>();
if (initializer == null || initializer.Parent.Parent is ForStatement)
return null;
var initializerRR = context.Resolve(initializer) as LocalResolveResult;
if (initializerRR == null)
return null;
var elementType = GetElementType(initializerRR, context);
if (elementType == null)
return null;
return new CodeAction(context.TranslateString("Iterate via foreach"), script => {
var iterator = MakeForeach(new IdentifierExpression(initializer.Name), elementType, context);
script.InsertAfter(context.GetNode<Statement>(), iterator);
}, initializer);
}
CodeAction ActionFromExpressionStatement(RefactoringContext context)
{
var expressionStatement = context.GetNode<ExpressionStatement>();
if (expressionStatement == null)
return null;
var expression = expressionStatement.Expression;
if (expression is AssignmentExpression)
expression = ((AssignmentExpression)expression).Left;
var expressionRR = context.Resolve(expression);
if (expressionRR == null)
return null;
var elementType = GetElementType(expressionRR, context);
if (elementType == null)
return null;
return new CodeAction(context.TranslateString("Iterate via foreach"), script => {
var iterator = MakeForeach(expression, elementType, context);
if (expression == expressionStatement.Expression)
script.Replace(expressionStatement, iterator);
else
script.InsertAfter(expressionStatement, iterator);
}, expression);
}
static ForeachStatement MakeForeach(Expression node, IType type, RefactoringContext context)
{
var namingHelper = new NamingHelper(context);
return new ForeachStatement {
VariableType = new SimpleType("var"),
VariableName = namingHelper.GenerateVariableName(type),
InExpression = node.Clone(),
EmbeddedStatement = new BlockStatement()
};
}
static IType GetElementType(ResolveResult rr, BaseRefactoringContext context)
{
if (rr.IsError || rr.Type.Kind == TypeKind.Unknown)
return null;
var type = GetCollectionType(rr.Type);
if (type == null)
return null;
var parameterizedType = type as ParameterizedType;
if (parameterizedType != null)
return parameterizedType.TypeArguments.First();
return context.Compilation.FindType(KnownTypeCode.Object);
}
static IType GetCollectionType(IType type)
{
IType collectionType = null;
foreach (var baseType in type.GetAllBaseTypes()) {
if (baseType.IsKnownType(KnownTypeCode.IEnumerableOfT)) {
collectionType = baseType;
break;
} else if (baseType.IsKnownType(KnownTypeCode.IEnumerable)) {
collectionType = baseType;
// Don't break, continue in case type implements IEnumerable<T>
}
}
return collectionType;
}
#endregion
}
}
|
