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Parse JS Module Blocks proposal (#12469)

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This commit is contained in:
Sosuke Suzuki
2021-02-22 04:08:20 +09:00
committed by GitHub
parent e4588bed22
commit 9c567baa9b
64 changed files with 1704 additions and 32 deletions
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12
packages/babel-parser/ast/spec.md
View File

@@ -87,6 +87,7 @@ These are the core @babel/parser (babylon) AST node types.
- [SequenceExpression](#sequenceexpression)
- [ParenthesizedExpression](#parenthesizedexpression)
- [DoExpression](#doexpression)
- [ModuleExpression](#moduleexpression)
- [Template Literals](#template-literals)
- [TemplateLiteral](#templateliteral)
- [TaggedTemplateExpression](#taggedtemplateexpression)
@@ -1086,6 +1087,17 @@ interface DoExpression <: Expression {
}
```
## ModuleExpression
```js
interface ModuleExpression <: Expression {
type: "ModuleExpression";
body: Program
}
```
A inline module expression proposed in https://github.com/tc39/proposal-js-module-blocks.
# Template Literals
## TemplateLiteral

42
packages/babel-parser/src/parser/expression.js
View File

@@ -56,6 +56,10 @@ import {
} from "../util/expression-scope";
import { Errors } from "./error";
/*::
import type { SourceType } from "../options";
*/
export default class ExpressionParser extends LValParser {
// Forward-declaration: defined in statement.js
/*::
@@ -78,6 +82,16 @@ export default class ExpressionParser extends LValParser {
) => T;
+parseFunctionParams: (node: N.Function, allowModifiers?: boolean) => void;
+takeDecorators: (node: N.HasDecorators) => void;
+parseBlockOrModuleBlockBody: (
body: N.Statement[],
directives: ?(N.Directive[]),
topLevel: boolean,
end: TokenType,
afterBlockParse?: (hasStrictModeDirective: boolean) => void
) => void
+parseProgram: (
program: N.Program, end: TokenType, sourceType?: SourceType
) => N.Program
*/
// For object literal, check if property __proto__ has been used more than once.
@@ -500,7 +514,13 @@ export default class ExpressionParser extends LValParser {
this.next();
return this.parseAwait(startPos, startLoc);
}
if (
this.isContextual("module") &&
this.lookaheadCharCode() === charCodes.leftCurlyBrace &&
!this.hasFollowingLineBreak()
) {
return this.parseModuleExpression();
}
const update = this.match(tt.incDec);
const node = this.startNode();
if (this.state.type.prefix) {
@@ -2630,4 +2650,24 @@ export default class ExpressionParser extends LValParser {
return ret;
}
// https://github.com/tc39/proposal-js-module-blocks
parseModuleExpression(): N.ModuleExpression {
this.expectPlugin("moduleBlocks");
const node = this.startNode<N.ModuleExpression>();
this.next(); // eat "module"
this.eat(tt.braceL);
const revertScopes = this.initializeScopes(/** inModule */ true);
this.enterInitialScopes();
const program = this.startNode<N.Program>();
try {
node.body = this.parseProgram(program, tt.braceR, "module");
} finally {
revertScopes();
}
this.eat(tt.braceR);
return this.finishNode<N.ModuleExpression>(node, "ModuleExpression");
}
}

22
packages/babel-parser/src/parser/index.js
View File

@@ -5,14 +5,7 @@ import type { File /*::, JSXOpeningElement */ } from "../types";
import type { PluginList } from "../plugin-utils";
import { getOptions } from "../options";
import StatementParser from "./statement";
import { SCOPE_PROGRAM } from "../util/scopeflags";
import ScopeHandler from "../util/scope";
import ClassScopeHandler from "../util/class-scope";
import ExpressionScopeHandler from "../util/expression-scope";
import ProductionParameterHandler, {
PARAM_AWAIT,
PARAM,
} from "../util/production-parameter";
export type PluginsMap = Map<string, { [string]: any }>;
@@ -28,14 +21,8 @@ export default class Parser extends StatementParser {
options = getOptions(options);
super(options, input);
const ScopeHandler = this.getScopeHandler();
this.options = options;
this.inModule = this.options.sourceType === "module";
this.scope = new ScopeHandler(this.raise.bind(this), this.inModule);
this.prodParam = new ProductionParameterHandler();
this.classScope = new ClassScopeHandler(this.raise.bind(this));
this.expressionScope = new ExpressionScopeHandler(this.raise.bind(this));
this.initializeScopes();
this.plugins = pluginsMap(this.options.plugins);
this.filename = options.sourceFilename;
}
@@ -46,12 +33,7 @@ export default class Parser extends StatementParser {
}
parse(): File {
let paramFlags = PARAM;
if (this.hasPlugin("topLevelAwait") && this.inModule) {
paramFlags |= PARAM_AWAIT;
}
this.scope.enter(SCOPE_PROGRAM);
this.prodParam.enter(paramFlags);
this.enterInitialScopes();
const file = this.startNode();
const program = this.startNode();
this.nextToken();

27
packages/babel-parser/src/parser/statement.js
View File

@@ -35,6 +35,7 @@ import {
newExpressionScope,
newParameterDeclarationScope,
} from "../util/expression-scope";
import type { SourceType } from "../options";
const loopLabel = { kind: "loop" },
switchLabel = { kind: "switch" };
@@ -55,12 +56,22 @@ export default class StatementParser extends ExpressionParser {
// to its body instead of creating a new node.
parseTopLevel(file: N.File, program: N.Program): N.File {
program.sourceType = this.options.sourceType;
file.program = this.parseProgram(program);
file.comments = this.state.comments;
if (this.options.tokens) file.tokens = this.tokens;
return this.finishNode(file, "File");
}
parseProgram(
program: N.Program,
end: TokenType = tt.eof,
sourceType: SourceType = this.options.sourceType,
): N.Program {
program.sourceType = sourceType;
program.interpreter = this.parseInterpreterDirective();
this.parseBlockBody(program, true, true, tt.eof);
this.parseBlockBody(program, true, true, end);
if (
this.inModule &&
!this.options.allowUndeclaredExports &&
@@ -72,13 +83,7 @@ export default class StatementParser extends ExpressionParser {
this.raise(pos, Errors.ModuleExportUndefined, name);
}
}
file.program = this.finishNode(program, "Program");
file.comments = this.state.comments;
if (this.options.tokens) file.tokens = this.tokens;
return this.finishNode(file, "File");
return this.finishNode<N.Program>(program, "Program");
}
// TODO

65
packages/babel-parser/src/parser/util.js
View File

@@ -6,7 +6,17 @@ import State from "../tokenizer/state";
import type { Node } from "../types";
import { lineBreak } from "../util/whitespace";
import { isIdentifierChar } from "../util/identifier";
import ClassScopeHandler from "../util/class-scope";
import ExpressionScopeHandler from "../util/expression-scope";
import { SCOPE_PROGRAM } from "../util/scopeflags";
import ProductionParameterHandler, {
PARAM_AWAIT,
PARAM,
} from "../util/production-parameter";
import { Errors } from "./error";
/*::
import type ScopeHandler from "../util/scope";
*/
type TryParse<Node, Error, Thrown, Aborted, FailState> = {
node: Node,
@@ -19,6 +29,11 @@ type TryParse<Node, Error, Thrown, Aborted, FailState> = {
// ## Parser utilities
export default class UtilParser extends Tokenizer {
// Forward-declaration: defined in parser/index.js
/*::
+getScopeHandler: () => Class<ScopeHandler<*>>;
*/
// TODO
addExtra(node: Node, key: string, val: any): void {
@@ -304,6 +319,56 @@ export default class UtilParser extends Tokenizer {
isObjectMethod(node: Node): boolean {
return node.type === "ObjectMethod";
}
initializeScopes(
inModule: boolean = this.options.sourceType === "module",
): () => void {
// Initialize state
const oldLabels = this.state.labels;
this.state.labels = [];
const oldExportedIdentifiers = this.state.exportedIdentifiers;
this.state.exportedIdentifiers = [];
// initialize scopes
const oldInModule = this.inModule;
this.inModule = inModule;
const oldScope = this.scope;
const ScopeHandler = this.getScopeHandler();
this.scope = new ScopeHandler(this.raise.bind(this), this.inModule);
const oldProdParam = this.prodParam;
this.prodParam = new ProductionParameterHandler();
const oldClassScope = this.classScope;
this.classScope = new ClassScopeHandler(this.raise.bind(this));
const oldExpressionScope = this.expressionScope;
this.expressionScope = new ExpressionScopeHandler(this.raise.bind(this));
return () => {
// Revert state
this.state.labels = oldLabels;
this.state.exportedIdentifiers = oldExportedIdentifiers;
// Revert scopes
this.inModule = oldInModule;
this.scope = oldScope;
this.prodParam = oldProdParam;
this.classScope = oldClassScope;
this.expressionScope = oldExpressionScope;
};
}
enterInitialScopes() {
let paramFlags = PARAM;
if (this.hasPlugin("topLevelAwait") && this.inModule) {
paramFlags |= PARAM_AWAIT;
}
this.scope.enter(SCOPE_PROGRAM);
this.prodParam.enter(paramFlags);
}
}
/**

5
packages/babel-parser/src/types.js
View File

@@ -655,6 +655,11 @@ export type TemplateElement = NodeBase & {
},
};
export type ModuleExpression = NodeBase & {
type: "ModuleExpression",
body: Program,
};
// Patterns
// TypeScript access modifiers

1
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-await-label-in-module-blocks/input.js vendored Normal file
View File

@@ -0,0 +1 @@
module { await: 3 };

4
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-await-label-in-module-blocks/options.json vendored Normal file
View File

@@ -0,0 +1,4 @@
{
"sourceType": "script",
"plugins": ["moduleBlocks"]
}

55
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-await-label-in-module-blocks/output.json vendored Normal file
View File

@@ -0,0 +1,55 @@
{
"type": "File",
"start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
"errors": [
"SyntaxError: Unexpected reserved word 'await' (1:9)"
],
"program": {
"type": "Program",
"start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
"sourceType": "script",
"interpreter": null,
"body": [
{
"type": "ExpressionStatement",
"start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
"expression": {
"type": "ModuleExpression",
"start":0,"end":19,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":19}},
"body": {
"type": "Program",
"start":9,"end":19,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":19}},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "LabeledStatement",
"start":9,"end":17,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":17}},
"body": {
"type": "ExpressionStatement",
"start":16,"end":17,"loc":{"start":{"line":1,"column":16},"end":{"line":1,"column":17}},
"expression": {
"type": "NumericLiteral",
"start":16,"end":17,"loc":{"start":{"line":1,"column":16},"end":{"line":1,"column":17}},
"extra": {
"rawValue": 3,
"raw": "3"
},
"value": 3
}
},
"label": {
"type": "Identifier",
"start":9,"end":14,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":14},"identifierName":"await"},
"name": "await"
}
}
],
"directives": []
}
}
}
],
"directives": []
}
}

7
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-class-in-module-blocks/input.js vendored Normal file
View File

@@ -0,0 +1,7 @@
class B {
#p() {
module {
class C { [this.#p]; }
};
}
}

9
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-class-in-module-blocks/options.json vendored Normal file
View File

@@ -0,0 +1,9 @@
{
"sourceType": "module",
"plugins": [
"moduleBlocks",
"classPrivateProperties",
"classPrivateMethods",
"classProperties"
]
}

116
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-class-in-module-blocks/output.json vendored Normal file
View File

@@ -0,0 +1,116 @@
{
"type": "File",
"start":0,"end":73,"loc":{"start":{"line":1,"column":0},"end":{"line":7,"column":1}},
"errors": [
"SyntaxError: Private name #p is not defined (4:22)"
],
"program": {
"type": "Program",
"start":0,"end":73,"loc":{"start":{"line":1,"column":0},"end":{"line":7,"column":1}},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "ClassDeclaration",
"start":0,"end":73,"loc":{"start":{"line":1,"column":0},"end":{"line":7,"column":1}},
"id": {
"type": "Identifier",
"start":6,"end":7,"loc":{"start":{"line":1,"column":6},"end":{"line":1,"column":7},"identifierName":"B"},
"name": "B"
},
"superClass": null,
"body": {
"type": "ClassBody",
"start":8,"end":73,"loc":{"start":{"line":1,"column":8},"end":{"line":7,"column":1}},
"body": [
{
"type": "ClassPrivateMethod",
"start":12,"end":71,"loc":{"start":{"line":2,"column":2},"end":{"line":6,"column":3}},
"static": false,
"key": {
"type": "PrivateName",
"start":12,"end":14,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":4}},
"id": {
"type": "Identifier",
"start":13,"end":14,"loc":{"start":{"line":2,"column":3},"end":{"line":2,"column":4},"identifierName":"p"},
"name": "p"
}
},
"kind": "method",
"id": null,
"generator": false,
"async": false,
"params": [],
"body": {
"type": "BlockStatement",
"start":17,"end":71,"loc":{"start":{"line":2,"column":7},"end":{"line":6,"column":3}},
"body": [
{
"type": "ExpressionStatement",
"start":23,"end":67,"loc":{"start":{"line":3,"column":4},"end":{"line":5,"column":6}},
"expression": {
"type": "ModuleExpression",
"start":23,"end":66,"loc":{"start":{"line":3,"column":4},"end":{"line":5,"column":5}},
"body": {
"type": "Program",
"start":38,"end":66,"loc":{"start":{"line":4,"column":6},"end":{"line":5,"column":5}},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "ClassDeclaration",
"start":38,"end":60,"loc":{"start":{"line":4,"column":6},"end":{"line":4,"column":28}},
"id": {
"type": "Identifier",
"start":44,"end":45,"loc":{"start":{"line":4,"column":12},"end":{"line":4,"column":13},"identifierName":"C"},
"name": "C"
},
"superClass": null,
"body": {
"type": "ClassBody",
"start":46,"end":60,"loc":{"start":{"line":4,"column":14},"end":{"line":4,"column":28}},
"body": [
{
"type": "ClassProperty",
"start":48,"end":58,"loc":{"start":{"line":4,"column":16},"end":{"line":4,"column":26}},
"static": false,
"computed": true,
"key": {
"type": "MemberExpression",
"start":49,"end":56,"loc":{"start":{"line":4,"column":17},"end":{"line":4,"column":24}},
"object": {
"type": "ThisExpression",
"start":49,"end":53,"loc":{"start":{"line":4,"column":17},"end":{"line":4,"column":21}}
},
"computed": false,
"property": {
"type": "PrivateName",
"start":54,"end":56,"loc":{"start":{"line":4,"column":22},"end":{"line":4,"column":24}},
"id": {
"type": "Identifier",
"start":55,"end":56,"loc":{"start":{"line":4,"column":23},"end":{"line":4,"column":24},"identifierName":"p"},
"name": "p"
}
}
},
"value": null
}
]
}
}
],
"directives": []
}
}
}
],
"directives": []
}
}
]
}
}
],
"directives": []
}
}

4
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-duplicated-exports-in-blocks/input.js vendored Normal file
View File

@@ -0,0 +1,4 @@
const m = module {
export const foo = "foo";
export { foo };
};

98
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-duplicated-exports-in-blocks/output.json vendored Normal file
View File

@@ -0,0 +1,98 @@
{
"type": "File",
"start":0,"end":67,"loc":{"start":{"line":1,"column":0},"end":{"line":4,"column":2}},
"errors": [
"SyntaxError: `foo` has already been exported. Exported identifiers must be unique. (3:11)"
],
"program": {
"type": "Program",
"start":0,"end":67,"loc":{"start":{"line":1,"column":0},"end":{"line":4,"column":2}},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "VariableDeclaration",
"start":0,"end":67,"loc":{"start":{"line":1,"column":0},"end":{"line":4,"column":2}},
"declarations": [
{
"type": "VariableDeclarator",
"start":6,"end":66,"loc":{"start":{"line":1,"column":6},"end":{"line":4,"column":1}},
"id": {
"type": "Identifier",
"start":6,"end":7,"loc":{"start":{"line":1,"column":6},"end":{"line":1,"column":7},"identifierName":"m"},
"name": "m"
},
"init": {
"type": "ModuleExpression",
"start":10,"end":66,"loc":{"start":{"line":1,"column":10},"end":{"line":4,"column":1}},
"body": {
"type": "Program",
"start":21,"end":66,"loc":{"start":{"line":2,"column":2},"end":{"line":4,"column":1}},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "ExportNamedDeclaration",
"start":21,"end":46,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":27}},
"specifiers": [],
"source": null,
"declaration": {
"type": "VariableDeclaration",
"start":28,"end":46,"loc":{"start":{"line":2,"column":9},"end":{"line":2,"column":27}},
"declarations": [
{
"type": "VariableDeclarator",
"start":34,"end":45,"loc":{"start":{"line":2,"column":15},"end":{"line":2,"column":26}},
"id": {
"type": "Identifier",
"start":34,"end":37,"loc":{"start":{"line":2,"column":15},"end":{"line":2,"column":18},"identifierName":"foo"},
"name": "foo"
},
"init": {
"type": "StringLiteral",
"start":40,"end":45,"loc":{"start":{"line":2,"column":21},"end":{"line":2,"column":26}},
"extra": {
"rawValue": "foo",
"raw": "\"foo\""
},
"value": "foo"
}
}
],
"kind": "const"
}
},
{
"type": "ExportNamedDeclaration",
"start":49,"end":64,"loc":{"start":{"line":3,"column":2},"end":{"line":3,"column":17}},
"specifiers": [
{
"type": "ExportSpecifier",
"start":58,"end":61,"loc":{"start":{"line":3,"column":11},"end":{"line":3,"column":14}},
"local": {
"type": "Identifier",
"start":58,"end":61,"loc":{"start":{"line":3,"column":11},"end":{"line":3,"column":14},"identifierName":"foo"},
"name": "foo"
},
"exported": {
"type": "Identifier",
"start":58,"end":61,"loc":{"start":{"line":3,"column":11},"end":{"line":3,"column":14},"identifierName":"foo"},
"name": "foo"
}
}
],
"source": null,
"declaration": null
}
],
"directives": []
}
}
}
],
"kind": "const"
}
],
"directives": []
}
}

2
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-linebreak-between-module-keyword-and-braces/input.js vendored Normal file
View File

@@ -0,0 +1,2 @@
const m = module
{}

40
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-linebreak-between-module-keyword-and-braces/output.json vendored Normal file
View File

@@ -0,0 +1,40 @@
{
"type": "File",
"start":0,"end":19,"loc":{"start":{"line":1,"column":0},"end":{"line":2,"column":2}},
"program": {
"type": "Program",
"start":0,"end":19,"loc":{"start":{"line":1,"column":0},"end":{"line":2,"column":2}},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "VariableDeclaration",
"start":0,"end":16,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":16}},
"declarations": [
{
"type": "VariableDeclarator",
"start":6,"end":16,"loc":{"start":{"line":1,"column":6},"end":{"line":1,"column":16}},
"id": {
"type": "Identifier",
"start":6,"end":7,"loc":{"start":{"line":1,"column":6},"end":{"line":1,"column":7},"identifierName":"m"},
"name": "m"
},
"init": {
"type": "Identifier",
"start":10,"end":16,"loc":{"start":{"line":1,"column":10},"end":{"line":1,"column":16},"identifierName":"module"},
"name": "module"
}
}
],
"kind": "const"
},
{
"type": "BlockStatement",
"start":17,"end":19,"loc":{"start":{"line":2,"column":0},"end":{"line":2,"column":2}},
"body": [],
"directives": []
}
],
"directives": []
}
}

3
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-undefined-export-in-module-blocks01/input.js vendored Normal file
View File

@@ -0,0 +1,3 @@
module {
export { foo }
}

55
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-undefined-export-in-module-blocks01/output.json vendored Normal file
View File

@@ -0,0 +1,55 @@
{
"type": "File",
"start":0,"end":27,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
"errors": [
"SyntaxError: Export 'foo' is not defined (2:11)"
],
"program": {
"type": "Program",
"start":0,"end":27,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "ExpressionStatement",
"start":0,"end":27,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
"expression": {
"type": "ModuleExpression",
"start":0,"end":27,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
"body": {
"type": "Program",
"start":11,"end":27,"loc":{"start":{"line":2,"column":2},"end":{"line":3,"column":1}},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "ExportNamedDeclaration",
"start":11,"end":25,"loc":{"start":{"line":2,"column":2},"end":{"line":2,"column":16}},
"specifiers": [
{
"type": "ExportSpecifier",
"start":20,"end":23,"loc":{"start":{"line":2,"column":11},"end":{"line":2,"column":14}},
"local": {
"type": "Identifier",
"start":20,"end":23,"loc":{"start":{"line":2,"column":11},"end":{"line":2,"column":14},"identifierName":"foo"},
"name": "foo"
},
"exported": {
"type": "Identifier",
"start":20,"end":23,"loc":{"start":{"line":2,"column":11},"end":{"line":2,"column":14},"identifierName":"foo"},
"name": "foo"
}
}
],
"source": null,
"declaration": null
}
],
"directives": []
}
}
}
],
"directives": []
}
}

4
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-undefined-export-in-module-blocks02/input.js vendored Normal file
View File

@@ -0,0 +1,4 @@
let foo;
module {
export { foo };
}

72
packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-undefined-export-in-module-blocks02/output.json vendored Normal file
View File

@@ -0,0 +1,72 @@
{
"type": "File",
"start":0,"end":37,"loc":{"start":{"line":1,"column":0},"end":{"line":4,"column":1}},
"errors": [
"SyntaxError: Export 'foo' is not defined (3:11)"
],
"program": {
"type": "Program",
"start":0,"end":37,"loc":{"start":{"line":1,"column":0},"end":{"line":4,"column":1}},
"sourceType": "module",
"interpreter": null,
"body": [
{
"type": "VariableDeclaration",
"start":0,"end":8,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":8}},
"declarations": [
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92
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