Extensions parsing #76867

jcouv · 2025-01-22T22:18:46Z

Relates to test plan #76130

CyrusNajmabadi · 2025-01-22T23:16:48Z

src/Compilers/CSharp/Portable/Generated/CSharp.Generated.g4

@@ -81,6 +81,7 @@ member_declaration
  | base_type_declaration
  | delegate_declaration
  | enum_member_declaration
+  | extension_container


don't love that it's not called _declaration. #Resolved

CyrusNajmabadi · 2025-01-22T23:17:11Z

src/Compilers/CSharp/Portable/Generated/CSharp.Generated.g4

@@ -348,6 +349,14 @@ delegate_declaration
  : attribute_list* modifier* 'delegate' type identifier_token type_parameter_list? parameter_list type_parameter_constraint_clause* ';'
  ;

+extension_container
+  : attribute_list* modifier* syntax_token type_parameter_list? '(' receiver_parameter ')' type_parameter_constraint_clause* '{' member_declaration* '}'


syntax_token? not 'extension'? #Resolved

nit: allow an identifier. people will try to write it, and it will allow for better error recovery.

nit: allow a parameter_list, as people will write more, and it will enable better error recovery.

CyrusNajmabadi · 2025-01-22T23:18:41Z

src/Compilers/CSharp/Portable/Generated/CSharp.Generated.g4

+  ;
+
+receiver_parameter
+  : attribute_list* modifier* type identifier_token?


we should allow a parameter_syntax. it will make it much easier ot recover and represent throughout the system. (similar to how even a => a uses a parameter_syntax).

overfitting syntax is often problematic. both for normal typing cases, and for expanding on this in the future. #Resolved

CyrusNajmabadi · 2025-01-22T23:20:01Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

@@ -1732,7 +1732,7 @@ private TypeDeclarationSyntax ParseClassOrStructOrInterfaceDeclaration(SyntaxLis
            _termState |= TerminatorState.IsEndOfRecordOrClassOrStructOrInterfaceSignature;

            var saveTerm = _termState;
-            _termState |= TerminatorState.IsPossibleAggregateClauseStartOrStop;
+            //_termState |= TerminatorState.IsPossibleAggregateClauseStartOrStop; // TODO2 looking for affected test


mark as prototype? so this doesn't get merged in? #Resolved

This PR is draft. Not ready for review. TODO2 comments are flagged by our build and are useful to track things that need to be handled in the PR ;-)

oh. gmail didn't mark this as draft. sorry!

gtk about TODO2. i didn't realize that.

CyrusNajmabadi · 2025-01-22T23:20:22Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

@@ -1962,6 +1963,151 @@ static TypeDeclarationSyntax constructTypeDeclaration(ContextAwareSyntax syntaxF
            }
        }

+        private MemberDeclarationSyntax ParseExtensionContainer(SyntaxList<AttributeListSyntax> attributes, SyntaxListBuilder modifiers)


make return type strongly typed. #Resolved

CyrusNajmabadi · 2025-01-22T23:20:48Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

+            var outerSaveTerm = _termState;
+            _termState |= TerminatorState.IsPossibleAggregateClauseStartOrStop; // TODO2 add test affected
+
+            TypeParameterListSyntax typeParameters = this.ParseTypeParameterList();


check for identifier and recover gracefully. #Resolved

CyrusNajmabadi · 2025-01-22T23:22:18Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

+            _termState |= TerminatorState.IsPossibleAggregateClauseStartOrStop; // TODO2 add test affected
+
+            TypeParameterListSyntax typeParameters = this.ParseTypeParameterList();
+            ReceiverParameterSyntax receiverParameter = parseReceiverParameter(out var openParenToken, out var closeParenToken);


parse a parameter list, with a requirement that at least a single parameter is required. This can be done by updating ParseParameterList to take a parameter stating if a single parameter is required (and passing that to hte hlper it calls).

you can optionally error at parse time or binding time if there is >1 parameter. I recommend binding time. #Resolved

By requiring a single parameter, you can be sure in later phases that it is safe to access [0]

CyrusNajmabadi · 2025-01-22T23:22:59Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

+                    _termState |= TerminatorState.IsEndOfRecordOrClassOrStructOrInterfaceSignature;
+                    constraints = _pool.Allocate<TypeParameterConstraintClauseSyntax>();
+                    this.ParseTypeParameterConstraintClauses(constraints);
+                }


extract this into helper. otehrwise it can get out of sync with type parameter parsing elsewhere. #Resolved

CyrusNajmabadi · 2025-01-22T23:23:25Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

+                    parseMembers = false;
+                }
+
+                if (parseMembers)


having a variable to just expand on if (!openBrace.IsMissing) seems excessive. #Resolved

CyrusNajmabadi · 2025-01-22T23:24:03Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

+
+                var modifiersList = (SyntaxList<SyntaxToken>)modifiers.ToList();
+                var membersList = (SyntaxList<MemberDeclarationSyntax>)members;
+                var constraintsList = (SyntaxList<TypeParameterConstraintClauseSyntax>)constraints;


this is confusing. we have the .ToListAndFree helpers. Why not use those? then you don't need a try/finally either. #Resolved

CyrusNajmabadi · 2025-01-22T23:24:18Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

+                    }
+                }
+
+                if (openBrace.IsMissing)


here you check the openBrace, instead of parseMembers #Resolved

CyrusNajmabadi · 2025-01-22T23:26:29Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

+                {
+                    members = _pool.Allocate<MemberDeclarationSyntax>();
+
+                    while (true)


afaict, this is a copy of ParseClassOrStructOrInterfaceDeclaration. Seems like we can just expand that to parse extensions, just with some extension-specific code. Note: as all teh rest support the primary cosntructor parameter list, this all falls out. The only difference that i can tell so far is simple that in the case of extensions we want at least one parameter (though this could be a binding-time check), and that we do not have an identifier. All of that seems similar to add to ParseClassOrStructOrInterfaceDeclaration vs this copy :) #Resolved

CyrusNajmabadi · 2025-01-22T23:27:48Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

+                SyntaxToken? identifier;
+                if (this.CurrentToken.Kind == SyntaxKind.CloseParenToken)
+                {
+                    identifier = null;


ah, you want identifiers to be optional. mixed feelings. but that feels very doable still :) #Resolved

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

CyrusNajmabadi · 2025-01-22T23:29:06Z

src/Compilers/Test/Core/Traits/CompilerFeature.cs

@@ -43,5 +43,6 @@ public enum CompilerFeature
        RecordStructs,
        RequiredMembers,
        RefLifetime,
+        Extensions,
    }
 }


incremental tests that changing class C(int i) to extension(int i) and vvice versa works would be good.
#Resolved

CyrusNajmabadi · 2025-01-22T23:29:52Z

Overall, this looks quite good to me. My pref is to share more int eh parser. either higher level parsing functinos, or lower level shared routines :) #Resolved

AlekseyTs · 2025-01-23T19:03:09Z

...ted/CSharpSyntaxGenerator/CSharpSyntaxGenerator.SourceGenerator/Syntax.xml.Main.Generated.cs

+    }
+
+    /// <summary>Creates a new ExtensionDeclarationSyntax instance.</summary>
+    public static ExtensionDeclarationSyntax ExtensionDeclaration(SyntaxList<AttributeListSyntax> attributeLists, SyntaxTokenList modifiers, SyntaxToken keyword, SyntaxToken identifier, TypeParameterListSyntax? typeParameterList, ParameterListSyntax? parameterList, BaseListSyntax? baseList, SyntaxList<TypeParameterConstraintClauseSyntax> constraintClauses, SyntaxList<MemberDeclarationSyntax> members)


BaseListSyntax? baseList

This parameter is unexpected

jcouv · 2025-01-23T19:03:53Z

@jcouv We probably should create a new feature branch for the new approach.

Yes. I've created features/extensions, but forgot to target this PR to that branch. Fixed

AlekseyTs · 2025-01-23T19:09:06Z

...d/CSharpSyntaxGenerator/CSharpSyntaxGenerator.SourceGenerator/Syntax.xml.Syntax.Generated.cs

+/// <item><description><see cref="SyntaxKind.ExtensionDeclaration"/></description></item>
+/// </list>
+/// </remarks>
+public sealed partial class ExtensionDeclarationSyntax : TypeDeclarationSyntax


public sealed partial class ExtensionDeclarationSyntax

Is this supposed to be added to the PublicAPI.Unshipped.txt? #Resolved

AlekseyTs · 2025-01-23T21:58:46Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

                skipBadParameterListTokens,
                allowTrailingSeparator: false,
-                requireOneElement: false,
+                requireOneElement: forExtension, // For extension declarations, we require one receiver parameter


requireOneElement: forExtension, // For extension declarations, we require one receiver parameter

It looks like the meaning of this parameter is to ensure that the syntax list is not empty, i.e. at least one item is expected. That doesn't mean that the helper won't accept more that one item. The comment, however, might be interpreted as though we instruct the helper to accept exactly one item (no more, no less). #Pending

AlekseyTs · 2025-01-23T22:06:38Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs


+            SyntaxToken? identifier;
            if (this.CurrentToken.Kind == SyntaxKind.IdentifierToken && IsCurrentTokenWhereOfConstraintClause())
            {
                identifier = this.AddError(CreateMissingIdentifierToken(), ErrorCode.ERR_IdentifierExpected);


identifier = this.AddError(CreateMissingIdentifierToken(), ErrorCode.ERR_IdentifierExpected);

It feels like this error recovery might not be appropriate when identifier is optional. Specifically, we probably do not want to create a missing identifier. #Pending

AlekseyTs · 2025-01-23T22:20:13Z

src/Compilers/CSharp/Portable/Parser/LanguageParser.cs

                skipBadParameterListTokens,
                allowTrailingSeparator: false,
-                requireOneElement: false,
+                requireOneElement: forExtension, // For extension declarations, we require one receiver parameter


requireOneElement: forExtension

It feels like it might be good to suppress any parsing diagnostics from syntax errors in the second and any following parameter in the list. Not sure how easy to do this, given that diagnostics is attached to nodes. Consider making a note to follow up later. #Pending

AlekseyTs · 2025-01-23T22:28:33Z

src/Compilers/CSharp/Portable/Syntax/SyntaxKindFacts.cs

@@ -244,6 +244,7 @@ public static bool IsAnyToken(SyntaxKind kind)
                case SyntaxKind.UnderscoreToken:
                case SyntaxKind.MultiLineRawStringLiteralToken:
                case SyntaxKind.SingleLineRawStringLiteralToken:
+                case SyntaxKind.ExtensionKeyword:


case SyntaxKind.ExtensionKeyword

Is this entry necessary? It looks like there is no entry for AllowsKeyword. #Pending

AlekseyTs · 2025-01-23T23:16:39Z

        TestOptions.RegularNext);

We also test language version behavior with RegularPreview. #Pending

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:134 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:17:31Z

        TestOptions.RegularNext);

I think tests that are not focused on language version should target RegularPreview. #Pending

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:200 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:21:19Z

    TestOptions.RegularNext);

Test with RegularPreview as well? #Pending

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:704 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:21:30Z

    TestOptions.RegularNext);

Test with RegularPreview as well? #Pending

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:744 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:26:14Z

extension(Type, Type) { }

Consider covering more error scenarios:

missing comma
some other syntax error in the second parameter
missing ) (with and without the second parameter)
etc.

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:931 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:33:26Z

    const int i = 0;

Do we expect a semantic error?

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:1713 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:33:47Z

    fixed int field[10];

Do we expect a semantic error? #Pending

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:1783 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:34:28Z

    event EventHandler eventField;

Do we expect a semantic error? #Pending

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:1857 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:34:57Z

    class D { }

Do we expect a semantic error?

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:1921 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:40:17Z

    var comp = CreateCompilation(src, parseOptions: TestOptions.RegularNext);

Consider testing with RegularPreview as well. #Pending

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:3261 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:40:24Z

        TestOptions.RegularNext,

Consider testing with RegularPreview as well. #Pending

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:3268 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:40:46Z

        TestOptions.RegularNext);

Consider testing with RegularPreview as well.

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:3311 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:41:04Z

    var comp = CreateCompilation(src, parseOptions: TestOptions.RegularNext);

Consider testing with RegularPreview as well.

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:3397 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:41:11Z

    UsingTree(src, TestOptions.RegularNext);

Consider testing with RegularPreview as well.

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:3400 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:41:20Z

        TestOptions.RegularNext);

Consider testing with RegularPreview as well.

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:3441 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:43:07Z

                        M(SyntaxKind.IdentifierToken);

The missing identifier feels unexpected

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:3676 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-23T23:55:02Z

Done with review pass (commit 9)

jcouv · 2025-01-24T01:17:38Z

    const int i = 0;

I think this may end up allowed, since emitted as static field.

In reply to: 2611226090

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:1713 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-24T01:20:51Z

    const int i = 0;

I think this may end up allowed, since emitted as static field.

The spec doesn't allow fields and we didn't even think what would it mean for implementation. Also, is this going to be an extension field?

In reply to: 2611341439

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:1713 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-24T01:21:38Z

    const int i = 0;

I suggest sticking to the spec for now

In reply to: 2611344424

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:1713 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

jcouv · 2025-01-24T01:22:16Z

    class D { }

This may be allowed (TBD)

In reply to: 2611227756

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:1921 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

AlekseyTs · 2025-01-24T01:28:12Z

    class D { }

This may be allowed (TBD)

I suggest sticking to the spec for now

In reply to: 2611345773

Refers to: src/Compilers/CSharp/Test/Syntax/Parsing/ExtensionsParsingTests.cs:1921 in 51686c8. [](commit_id = 51686c8, deletion_comment = False)

Extensions parsing

d6b6d13

jcouv added the Feature - Extension Everything The extension everything feature label Jan 22, 2025

jcouv self-assigned this Jan 22, 2025

dotnet-issue-labeler bot added Area-Compilers untriaged Issues and PRs which have not yet been triaged by a lead labels Jan 22, 2025

dotnet-policy-service bot added the Needs API Review Needs to be reviewed by the API review council label Jan 22, 2025

jcouv added 3 commits January 22, 2025 15:11

More tests

1142e50

Look for affected tests

ade3728

Look for affected tests

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CyrusNajmabadi reviewed Jan 22, 2025

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src/Compilers/CSharp/Portable/Parser/LanguageParser.cs Outdated Show resolved Hide resolved

CyrusNajmabadi reviewed Jan 22, 2025

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Re-use TypeDeclarationSyntax and ParameterSyntax

8e29f61

jcouv force-pushed the extensions-parsing branch from 15cf64b to 8e29f61 Compare January 23, 2025 14:28

Tweaks

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jcouv marked this pull request as ready for review January 23, 2025 16:38

jcouv requested a review from a team as a code owner January 23, 2025 16:38

jcouv changed the base branch from main to features/extensions January 23, 2025 19:02

AlekseyTs reviewed Jan 23, 2025

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Extensions parsing #76867

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Extensions parsing #76867

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