-
Notifications
You must be signed in to change notification settings - Fork 12.7k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
1 parent
9d5f62a
commit 2384d95
Showing
9 changed files
with
220 additions
and
32 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,24 +1,125 @@ | ||
| /*@internal*/ | ||
| namespace ts { | ||
| export function transformESNext(context: TransformationContext) { | ||
| return chainBundle(context, transformSourceFile); | ||
|
|
||
| function transformSourceFile(node: SourceFile) { | ||
| if (node.isDeclarationFile) { | ||
| return node; | ||
| } | ||
|
|
||
| return visitEachChild(node, visitor, context); | ||
| } | ||
|
|
||
| function visitor(node: Node): VisitResult<Node> { | ||
| if ((node.transformFlags & TransformFlags.ContainsESNext) === 0) { | ||
| return node; | ||
| } | ||
| switch (node.kind) { | ||
| default: | ||
| return visitEachChild(node, visitor, context); | ||
| } | ||
| } | ||
| } | ||
| export function transformESNext(context: TransformationContext) { | ||
| let currentClassHasInstanceTracker: Identifier | undefined; | ||
| return chainBundle(context, transformSourceFile); | ||
|
|
||
| function transformSourceFile(node: SourceFile) { | ||
| if (node.isDeclarationFile) { | ||
| return node; | ||
| } | ||
|
|
||
| return visitEachChild(node, visitor, context); | ||
| } | ||
|
|
||
| function visitor(node: Node): VisitResult<Node> { | ||
| if ((node.transformFlags & TransformFlags.ContainsESNext) === 0) { | ||
| return node; | ||
| } | ||
| switch (node.kind) { | ||
| case SyntaxKind.ClassDeclaration: | ||
| case SyntaxKind.ClassExpression: | ||
| return visitClassLike(node as ClassDeclaration | ClassExpression); | ||
| case SyntaxKind.CallExpression: | ||
| return visitCallExpression(node as CallExpression); | ||
| default: | ||
| return visitEachChild(node, visitor, context); | ||
| } | ||
| } | ||
|
|
||
| function visitClassLike(node: ClassDeclaration | ClassExpression) { | ||
| const oldClassHasInstanceTracker = currentClassHasInstanceTracker; | ||
| currentClassHasInstanceTracker = undefined; | ||
| const updated = visitEachChild(node, visitor, context); | ||
| if (!currentClassHasInstanceTracker) { | ||
| currentClassHasInstanceTracker = oldClassHasInstanceTracker; | ||
| return updated; | ||
| } | ||
|
|
||
| // var tracker; tracker = new WeakSet(); | ||
| context.hoistVariableDeclaration(currentClassHasInstanceTracker); | ||
| context.addInitializationStatement( | ||
| factory.createExpressionStatement( | ||
| factory.createAssignment( | ||
| currentClassHasInstanceTracker, | ||
| factory.createNewExpression(factory.createIdentifier("WeakSet"), /** generics */ undefined, /** args */ undefined) | ||
| ) | ||
| ) | ||
| ); | ||
|
|
||
| // tracker.add(this); | ||
| const track = factory.createExpressionStatement(factory.createCallExpression(factory.createPropertyAccessExpression(currentClassHasInstanceTracker, "add"), /** generics */ undefined, [factory.createThis()])); | ||
|
|
||
| const originalConstructor = getFirstConstructorWithBody(node); | ||
| let updatedConstructor: ConstructorDeclaration = originalConstructor || createDefaultConstructor(isClassExtended(node), [track]); | ||
| if (originalConstructor) { | ||
| const body = updatedConstructor.body!; | ||
| const updatedBody = isClassExtended(node) ? | ||
| // extended class, add track after super() | ||
| visitEachChild(body, function visitor(node): VisitResult<Node> { | ||
| if (node.kind === SyntaxKind.ClassDeclaration || node.kind === SyntaxKind.ClassExpression || node.kind === SyntaxKind.FunctionDeclaration || node.kind === SyntaxKind.FunctionExpression) return node; | ||
| if (isCallExpression(node) && node.expression.kind === SyntaxKind.SuperKeyword) { | ||
| return factory.createCommaListExpression([node, track.expression, factory.createThis()]); | ||
| } | ||
| return visitEachChild(node, visitor, context); | ||
| }, context) : | ||
| // plain class, add track at the top | ||
| factory.updateBlock(body, [track, ...body.statements]); | ||
| updatedConstructor = factory.updateConstructorDeclaration(updatedConstructor, updatedConstructor.decorators, updatedConstructor.modifiers, updatedConstructor.parameters, updatedBody); | ||
| } | ||
|
|
||
| const updatedMembers = originalConstructor ? updated.members.map(element => element === originalConstructor ? updatedConstructor : element) : [updatedConstructor, ...updated.members]; | ||
|
|
||
| currentClassHasInstanceTracker = oldClassHasInstanceTracker; | ||
| if (isClassDeclaration(updated)) { | ||
| return factory.updateClassDeclaration( | ||
| updated, | ||
| updated.decorators, | ||
| updated.modifiers, | ||
| updated.name, | ||
| updated.typeParameters, | ||
| updated.heritageClauses, | ||
| updatedMembers, | ||
| ); | ||
| } | ||
| else { | ||
| return factory.updateClassExpression( | ||
| updated, | ||
| updated.decorators, | ||
| updated.modifiers, | ||
| updated.name, | ||
| updated.typeParameters, | ||
| updated.heritageClauses, | ||
| updatedMembers, | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| function visitCallExpression(node: CallExpression) { | ||
| const lhs = node.expression as MetaProperty; | ||
| if (lhs.kind !== SyntaxKind.MetaProperty || lhs.keywordToken !== SyntaxKind.ClassKeyword) return visitEachChild(node, visitor, context); | ||
| if (!currentClassHasInstanceTracker) { | ||
| currentClassHasInstanceTracker = factory.createTempVariable(noop, /** reserveNested */ true); | ||
| } | ||
| // tracker.has() | ||
| const trackerDotHas = factory.createPropertyAccessChain(currentClassHasInstanceTracker, /** ?. */ undefined, "has"); | ||
| const arg0 = visitEachChild(node.arguments[0] || factory.createNull(), visitor, context); | ||
| return factory.createCallExpression(trackerDotHas, /** generics */ undefined, [arg0]); | ||
| } | ||
| } | ||
| function isClassExtended(node: ClassLikeDeclaration) { | ||
| return some(node.heritageClauses, node => node.token === SyntaxKind.ExtendsKeyword); | ||
| } | ||
| function createDefaultConstructor(isExtended: boolean, additionalStatements: Statement[]) { | ||
| const params: ParameterDeclaration[] = []; | ||
| const statements: Statement[] = []; | ||
| if (isExtended) { | ||
| const rest = factory.createTempVariable(noop); | ||
| const param = factory.createParameterDeclaration(/** deco */ undefined, /** mod */ undefined, factory.createToken(SyntaxKind.DotDotDotToken), rest); | ||
| params.push(param); | ||
| statements.push(factory.createExpressionStatement(factory.createCallExpression(factory.createSuper(), /** generics */ undefined, [factory.createSpreadElement(rest)]))); | ||
| } | ||
| statements.push(...additionalStatements); | ||
| return factory.createConstructorDeclaration(/** deco */ undefined, /** modifiers */ undefined, params, factory.createBlock(statements)); | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.