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45cb3aba
编写于
5月 28, 2017
作者:
C
CyrusNajmabadi
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
Properly use ?. in an expression containing a nullable type.
上级
a2bfbbcb
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
120 addition
and
5 deletion
+120
-5
src/EditorFeatures/CSharpTest/UseNullPropagation/UseNullPropagationTests.cs
.../CSharpTest/UseNullPropagation/UseNullPropagationTests.cs
+70
-0
src/Features/Core/Portable/UseNullPropagation/AbstractUseNullPropagationCodeFixProvider.cs
...lPropagation/AbstractUseNullPropagationCodeFixProvider.cs
+36
-4
src/Features/Core/Portable/UseNullPropagation/AbstractUseNullPropagationDiagnosticAnalyzer.cs
...opagation/AbstractUseNullPropagationDiagnosticAnalyzer.cs
+14
-1
未找到文件。
src/EditorFeatures/CSharpTest/UseNullPropagation/UseNullPropagationTests.cs
浏览文件 @
45cb3aba
...
...
@@ -360,5 +360,75 @@ public void Method<T>(Expression<Func<T, string>> functor)
}
}"
);
}
[
WorkItem
(
19774
,
"https://github.com/dotnet/roslyn/issues/19774"
)]
[
Fact
,
Trait
(
Traits
.
Feature
,
Traits
.
Features
.
CodeActionsUseNullPropagation
)]
public
async
Task
TestNullableMemberAccess
()
{
await
TestInRegularAndScriptAsync
(
@"
using System;
class C
{
void Main(DateTime? toDate)
{
var v = [||]toDate == null ? null : toDate.Value.ToString(""yyyy/MM/ dd"");
}
}
"
,
@"
using System;
class C
{
void Main(DateTime? toDate)
{
var v = toDate?.ToString(""yyyy/MM/ dd"");
}
}
"
);
}
[
WorkItem
(
19774
,
"https://github.com/dotnet/roslyn/issues/19774"
)]
[
Fact
,
Trait
(
Traits
.
Feature
,
Traits
.
Features
.
CodeActionsUseNullPropagation
)]
public
async
Task
TestNullableElementAccess
()
{
await
TestInRegularAndScriptAsync
(
@"
using System;
struct S
{
public string this[int i] => """";
}
class C
{
void Main(S? s)
{
var x = [||]s == null ? null : s.Value[0];
}
}
"
,
@"
using System;
struct S
{
public string this[int i] => """";
}
class C
{
void Main(S? s)
{
var x = s?[0];
}
}
"
);
}
}
}
\ No newline at end of file
src/Features/Core/Portable/UseNullPropagation/AbstractUseNullPropagationCodeFixProvider.cs
浏览文件 @
45cb3aba
...
...
@@ -65,6 +65,7 @@ public override Task RegisterCodeFixesAsync(CodeFixContext context)
syntaxFacts
.
GetPartsOfConditionalExpression
(
conditionalExpression
,
out
var
condition
,
out
var
whenTrue
,
out
var
whenFalse
);
var
whenPartIsNullable
=
diagnostic
.
Properties
.
ContainsKey
(
UseNullPropagationConstants
.
WhenPartIsNullable
);
editor
.
ReplaceNode
(
conditionalExpression
,
(
c
,
g
)
=>
{
syntaxFacts
.
GetPartsOfConditionalExpression
(
...
...
@@ -82,7 +83,7 @@ public override Task RegisterCodeFixesAsync(CodeFixContext context)
}
var
newNode
=
CreateConditionalAccessExpression
(
syntaxFacts
,
g
,
currentWhenPartToCheck
,
match
,
c
);
syntaxFacts
,
g
,
whenPartIsNullable
,
currentWhenPartToCheck
,
match
,
c
);
newNode
=
newNode
.
WithTriviaFrom
(
c
);
return
newNode
;
...
...
@@ -93,10 +94,41 @@ public override Task RegisterCodeFixesAsync(CodeFixContext context)
}
private
SyntaxNode
CreateConditionalAccessExpression
(
ISyntaxFactsService
syntaxFacts
,
SyntaxGenerator
generator
,
ISyntaxFactsService
syntaxFacts
,
SyntaxGenerator
generator
,
bool
whenPartIsNullable
,
SyntaxNode
whenPart
,
SyntaxNode
match
,
SyntaxNode
currentConditional
)
{
var
memberAccess
=
match
.
Parent
as
TMemberAccessExpression
;
if
(
whenPartIsNullable
)
{
if
(
match
.
Parent
is
TMemberAccessExpression
memberAccess
)
{
var
nameNode
=
syntaxFacts
.
GetNameOfMemberAccessExpression
(
memberAccess
);
syntaxFacts
.
GetNameAndArityOfSimpleName
(
nameNode
,
out
var
name
,
out
var
arity
);
var
comparer
=
syntaxFacts
.
IsCaseSensitive
?
StringComparer
.
Ordinal
:
CaseInsensitiveComparison
.
Comparer
;
if
(
arity
==
0
&&
comparer
.
Equals
(
name
,
nameof
(
Nullable
<
int
>.
Value
)))
{
// They're calling ".Value" off of a nullable. Because we're moving to ?.
// we want to remove the .Value as well. i.e. we should generate:
//
// foo?.Bar() not foo?.Value.Bar();
return
CreateConditionalAccessExpression
(
syntaxFacts
,
generator
,
whenPart
,
match
,
memberAccess
.
Parent
,
currentConditional
);
}
}
}
return
CreateConditionalAccessExpression
(
syntaxFacts
,
generator
,
whenPart
,
match
,
match
.
Parent
,
currentConditional
);
}
private
SyntaxNode
CreateConditionalAccessExpression
(
ISyntaxFactsService
syntaxFacts
,
SyntaxGenerator
generator
,
SyntaxNode
whenPart
,
SyntaxNode
match
,
SyntaxNode
matchParent
,
SyntaxNode
currentConditional
)
{
var
memberAccess
=
matchParent
as
TMemberAccessExpression
;
if
(
memberAccess
!=
null
)
{
return
whenPart
.
ReplaceNode
(
memberAccess
,
...
...
@@ -106,7 +138,7 @@ public override Task RegisterCodeFixesAsync(CodeFixContext context)
syntaxFacts
.
GetNameOfMemberAccessExpression
(
memberAccess
))));
}
var
elementAccess
=
match
.
Parent
as
TElementAccessExpression
;
var
elementAccess
=
matchParent
as
TElementAccessExpression
;
if
(
elementAccess
!=
null
)
{
return
whenPart
.
ReplaceNode
(
elementAccess
,
...
...
src/Features/Core/Portable/UseNullPropagation/AbstractUseNullPropagationDiagnosticAnalyzer.cs
浏览文件 @
45cb3aba
...
...
@@ -8,6 +8,11 @@
namespace
Microsoft.CodeAnalysis.UseNullPropagation
{
internal
static
class
UseNullPropagationConstants
{
public
const
string
WhenPartIsNullable
=
nameof
(
WhenPartIsNullable
);
}
internal
abstract
class
AbstractUseNullPropagationDiagnosticAnalyzer
<
TSyntaxKind
,
TExpressionSyntax
,
...
...
@@ -147,10 +152,18 @@ private void AnalyzeSyntax(SyntaxNodeAnalysisContext context, INamedTypeSymbol e
conditionPartToCheck
.
GetLocation
(),
whenPartToCheck
.
GetLocation
());
var
properties
=
ImmutableDictionary
<
string
,
string
>.
Empty
;
var
whenPartIsNullable
=
semanticModel
.
GetTypeInfo
(
whenPartMatch
).
Type
?.
OriginalDefinition
.
SpecialType
==
SpecialType
.
System_Nullable_T
;
if
(
whenPartIsNullable
)
{
properties
=
properties
.
Add
(
UseNullPropagationConstants
.
WhenPartIsNullable
,
""
);
}
context
.
ReportDiagnostic
(
Diagnostic
.
Create
(
this
.
GetDescriptorWithSeverity
(
option
.
Notification
.
Value
),
conditionalExpression
.
GetLocation
(),
locations
));
locations
,
properties
));
}
internal
static
SyntaxNode
GetWhenPartMatch
(
...
...
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