-
Notifications
You must be signed in to change notification settings - Fork 4k
/
AbstractConvertNumericLiteralCodeRefactoringProvider.cs
172 lines (148 loc) · 7.04 KB
/
AbstractConvertNumericLiteralCodeRefactoringProvider.cs
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
166
167
168
169
170
171
172
// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.Shared.Utilities;
using Microsoft.CodeAnalysis.LanguageServices;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.CodeRefactorings;
namespace Microsoft.CodeAnalysis.ConvertNumericLiteral
{
internal abstract class AbstractConvertNumericLiteralCodeRefactoringProvider : CodeRefactoringProvider
{
public sealed override async Task ComputeRefactoringsAsync(CodeRefactoringContext context)
{
var document = context.Document;
var cancellationToken = context.CancellationToken;
var syntaxFacts = document.GetLanguageService<ISyntaxFactsService>();
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var numericToken = await root.SyntaxTree.GetTouchingTokenAsync(context.Span.Start,
token => syntaxFacts.IsNumericLiteralExpression(token.Parent), cancellationToken).ConfigureAwait(false);
if (numericToken == default)
{
return;
}
if (numericToken.ContainsDiagnostics)
{
return;
}
if (context.Span.Length > 0 &&
context.Span != numericToken.Span)
{
return;
}
var syntaxNode = numericToken.Parent;
var semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var symbol = semanticModel.GetTypeInfo(syntaxNode, cancellationToken).Type;
if (symbol == null)
{
return;
}
if (!IsIntegral(symbol.SpecialType))
{
return;
}
var valueOpt = semanticModel.GetConstantValue(syntaxNode);
if (!valueOpt.HasValue)
{
return;
}
var value = IntegerUtilities.ToInt64(valueOpt.Value);
var numericText = numericToken.ToString();
var (hexPrefix, binaryPrefix) = GetNumericLiteralPrefixes();
var (prefix, number, suffix) = GetNumericLiteralParts(numericText, hexPrefix, binaryPrefix);
var kind = string.IsNullOrEmpty(prefix) ? NumericKind.Decimal
: prefix.Equals(hexPrefix, StringComparison.OrdinalIgnoreCase) ? NumericKind.Hexadecimal
: prefix.Equals(binaryPrefix, StringComparison.OrdinalIgnoreCase) ? NumericKind.Binary
: NumericKind.Unknown;
if (kind == NumericKind.Unknown)
{
return;
}
if (kind != NumericKind.Decimal)
{
RegisterRefactoringWithResult(value.ToString(), FeaturesResources.Convert_to_decimal);
}
if (kind != NumericKind.Binary)
{
RegisterRefactoringWithResult(binaryPrefix + Convert.ToString(value, 2), FeaturesResources.Convert_to_binary);
}
if (kind != NumericKind.Hexadecimal)
{
RegisterRefactoringWithResult(hexPrefix + value.ToString("X"), FeaturesResources.Convert_to_hex);
}
const string DigitSeparator = "_";
if (numericText.Contains(DigitSeparator))
{
RegisterRefactoringWithResult(prefix + number.Replace(DigitSeparator, string.Empty), FeaturesResources.Remove_separators);
}
else
{
switch (kind)
{
case NumericKind.Decimal when number.Length > 3:
RegisterRefactoringWithResult(AddSeparators(number, 3), FeaturesResources.Separate_thousands);
break;
case NumericKind.Hexadecimal when number.Length > 4:
RegisterRefactoringWithResult(hexPrefix + AddSeparators(number, 4), FeaturesResources.Separate_words);
break;
case NumericKind.Binary when number.Length > 4:
RegisterRefactoringWithResult(binaryPrefix + AddSeparators(number, 4), FeaturesResources.Separate_nibbles);
break;
}
}
void RegisterRefactoringWithResult(string text, string title)
{
context.RegisterRefactoring(new MyCodeAction(title, c =>
{
var generator = SyntaxGenerator.GetGenerator(document);
var updatedToken = generator.NumericLiteralToken(text + suffix, (ulong)value)
.WithTriviaFrom(numericToken);
var updatedRoot = root.ReplaceToken(numericToken, updatedToken);
return Task.FromResult(document.WithSyntaxRoot(updatedRoot));
}));
}
}
private static (string prefix, string number, string suffix) GetNumericLiteralParts(string numericText, string hexPrefix, string binaryPrefix)
{
// Match literal text and extract out base prefix, type suffix and the number itself.
var groups = Regex.Match(numericText, $"({hexPrefix}|{binaryPrefix})?([_0-9a-f]+)(.*)", RegexOptions.IgnoreCase).Groups;
return (prefix: groups[1].Value, number: groups[2].Value, suffix: groups[3].Value);
}
private static string AddSeparators(string numericText, int interval)
{
// Insert digit separators in the given interval.
var result = Regex.Replace(numericText, $"(.{{{interval}}})", "_$1", RegexOptions.RightToLeft);
// Fix for the case "0x_1111" that is not supported yet.
return result[0] == '_' ? result.Substring(1) : result;
}
private static bool IsIntegral(SpecialType specialType)
{
switch (specialType)
{
case SpecialType.System_Byte:
case SpecialType.System_SByte:
case SpecialType.System_Int16:
case SpecialType.System_UInt16:
case SpecialType.System_Int32:
case SpecialType.System_UInt32:
case SpecialType.System_Int64:
case SpecialType.System_UInt64:
return true;
default:
return false;
}
}
protected abstract (string hexPrefix, string binaryPrefix) GetNumericLiteralPrefixes();
private enum NumericKind { Unknown, Decimal, Binary, Hexadecimal }
private sealed class MyCodeAction : CodeAction.DocumentChangeAction
{
public MyCodeAction(string title, Func<CancellationToken, Task<Document>> createChangedDocument) : base(title, createChangedDocument)
{
}
}
}
}