463 lines
17 KiB
JavaScript
463 lines
17 KiB
JavaScript
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"use strict";Object.defineProperty(exports, "__esModule", {value: true}); function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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var _keywords = require('../parser/tokenizer/keywords');
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var _types = require('../parser/tokenizer/types');
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var _getClassInfo = require('../util/getClassInfo'); var _getClassInfo2 = _interopRequireDefault(_getClassInfo);
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var _CJSImportTransformer = require('./CJSImportTransformer'); var _CJSImportTransformer2 = _interopRequireDefault(_CJSImportTransformer);
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var _ESMImportTransformer = require('./ESMImportTransformer'); var _ESMImportTransformer2 = _interopRequireDefault(_ESMImportTransformer);
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var _FlowTransformer = require('./FlowTransformer'); var _FlowTransformer2 = _interopRequireDefault(_FlowTransformer);
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var _JestHoistTransformer = require('./JestHoistTransformer'); var _JestHoistTransformer2 = _interopRequireDefault(_JestHoistTransformer);
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var _JSXTransformer = require('./JSXTransformer'); var _JSXTransformer2 = _interopRequireDefault(_JSXTransformer);
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var _NumericSeparatorTransformer = require('./NumericSeparatorTransformer'); var _NumericSeparatorTransformer2 = _interopRequireDefault(_NumericSeparatorTransformer);
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var _OptionalCatchBindingTransformer = require('./OptionalCatchBindingTransformer'); var _OptionalCatchBindingTransformer2 = _interopRequireDefault(_OptionalCatchBindingTransformer);
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var _OptionalChainingNullishTransformer = require('./OptionalChainingNullishTransformer'); var _OptionalChainingNullishTransformer2 = _interopRequireDefault(_OptionalChainingNullishTransformer);
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var _ReactDisplayNameTransformer = require('./ReactDisplayNameTransformer'); var _ReactDisplayNameTransformer2 = _interopRequireDefault(_ReactDisplayNameTransformer);
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var _ReactHotLoaderTransformer = require('./ReactHotLoaderTransformer'); var _ReactHotLoaderTransformer2 = _interopRequireDefault(_ReactHotLoaderTransformer);
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var _TypeScriptTransformer = require('./TypeScriptTransformer'); var _TypeScriptTransformer2 = _interopRequireDefault(_TypeScriptTransformer);
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class RootTransformer {
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__init() {this.transformers = []}
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__init2() {this.generatedVariables = []}
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constructor(
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sucraseContext,
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transforms,
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enableLegacyBabel5ModuleInterop,
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options,
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) {;RootTransformer.prototype.__init.call(this);RootTransformer.prototype.__init2.call(this);
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this.nameManager = sucraseContext.nameManager;
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this.helperManager = sucraseContext.helperManager;
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const {tokenProcessor, importProcessor} = sucraseContext;
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this.tokens = tokenProcessor;
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this.isImportsTransformEnabled = transforms.includes("imports");
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this.isReactHotLoaderTransformEnabled = transforms.includes("react-hot-loader");
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this.disableESTransforms = Boolean(options.disableESTransforms);
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if (!options.disableESTransforms) {
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this.transformers.push(
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new (0, _OptionalChainingNullishTransformer2.default)(tokenProcessor, this.nameManager),
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);
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this.transformers.push(new (0, _NumericSeparatorTransformer2.default)(tokenProcessor));
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this.transformers.push(new (0, _OptionalCatchBindingTransformer2.default)(tokenProcessor, this.nameManager));
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}
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if (transforms.includes("jsx")) {
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if (options.jsxRuntime !== "preserve") {
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this.transformers.push(
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new (0, _JSXTransformer2.default)(this, tokenProcessor, importProcessor, this.nameManager, options),
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);
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}
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this.transformers.push(
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new (0, _ReactDisplayNameTransformer2.default)(this, tokenProcessor, importProcessor, options),
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);
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}
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let reactHotLoaderTransformer = null;
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if (transforms.includes("react-hot-loader")) {
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if (!options.filePath) {
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throw new Error("filePath is required when using the react-hot-loader transform.");
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}
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reactHotLoaderTransformer = new (0, _ReactHotLoaderTransformer2.default)(tokenProcessor, options.filePath);
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this.transformers.push(reactHotLoaderTransformer);
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}
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// Note that we always want to enable the imports transformer, even when the import transform
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// itself isn't enabled, since we need to do type-only import pruning for both Flow and
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// TypeScript.
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if (transforms.includes("imports")) {
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if (importProcessor === null) {
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throw new Error("Expected non-null importProcessor with imports transform enabled.");
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}
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this.transformers.push(
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new (0, _CJSImportTransformer2.default)(
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this,
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tokenProcessor,
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importProcessor,
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this.nameManager,
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this.helperManager,
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reactHotLoaderTransformer,
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enableLegacyBabel5ModuleInterop,
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Boolean(options.enableLegacyTypeScriptModuleInterop),
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transforms.includes("typescript"),
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transforms.includes("flow"),
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Boolean(options.preserveDynamicImport),
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Boolean(options.keepUnusedImports),
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),
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);
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} else {
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this.transformers.push(
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new (0, _ESMImportTransformer2.default)(
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tokenProcessor,
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this.nameManager,
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this.helperManager,
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reactHotLoaderTransformer,
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transforms.includes("typescript"),
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transforms.includes("flow"),
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Boolean(options.keepUnusedImports),
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options,
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),
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);
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}
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if (transforms.includes("flow")) {
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this.transformers.push(
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new (0, _FlowTransformer2.default)(this, tokenProcessor, transforms.includes("imports")),
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);
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}
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if (transforms.includes("typescript")) {
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this.transformers.push(
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new (0, _TypeScriptTransformer2.default)(this, tokenProcessor, transforms.includes("imports")),
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);
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}
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if (transforms.includes("jest")) {
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this.transformers.push(
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new (0, _JestHoistTransformer2.default)(this, tokenProcessor, this.nameManager, importProcessor),
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);
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}
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}
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transform() {
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this.tokens.reset();
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this.processBalancedCode();
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const shouldAddUseStrict = this.isImportsTransformEnabled;
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// "use strict" always needs to be first, so override the normal transformer order.
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let prefix = shouldAddUseStrict ? '"use strict";' : "";
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for (const transformer of this.transformers) {
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prefix += transformer.getPrefixCode();
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}
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prefix += this.helperManager.emitHelpers();
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prefix += this.generatedVariables.map((v) => ` var ${v};`).join("");
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for (const transformer of this.transformers) {
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prefix += transformer.getHoistedCode();
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}
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let suffix = "";
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for (const transformer of this.transformers) {
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suffix += transformer.getSuffixCode();
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}
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const result = this.tokens.finish();
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let {code} = result;
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if (code.startsWith("#!")) {
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let newlineIndex = code.indexOf("\n");
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if (newlineIndex === -1) {
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newlineIndex = code.length;
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code += "\n";
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}
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return {
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code: code.slice(0, newlineIndex + 1) + prefix + code.slice(newlineIndex + 1) + suffix,
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// The hashbang line has no tokens, so shifting the tokens to account
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// for prefix can happen normally.
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mappings: this.shiftMappings(result.mappings, prefix.length),
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};
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} else {
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return {
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code: prefix + code + suffix,
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mappings: this.shiftMappings(result.mappings, prefix.length),
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};
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}
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}
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processBalancedCode() {
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let braceDepth = 0;
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let parenDepth = 0;
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while (!this.tokens.isAtEnd()) {
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if (this.tokens.matches1(_types.TokenType.braceL) || this.tokens.matches1(_types.TokenType.dollarBraceL)) {
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braceDepth++;
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} else if (this.tokens.matches1(_types.TokenType.braceR)) {
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if (braceDepth === 0) {
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return;
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}
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braceDepth--;
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}
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if (this.tokens.matches1(_types.TokenType.parenL)) {
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parenDepth++;
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} else if (this.tokens.matches1(_types.TokenType.parenR)) {
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if (parenDepth === 0) {
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return;
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}
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parenDepth--;
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}
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this.processToken();
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}
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}
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processToken() {
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if (this.tokens.matches1(_types.TokenType._class)) {
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this.processClass();
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return;
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}
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for (const transformer of this.transformers) {
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const wasProcessed = transformer.process();
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if (wasProcessed) {
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return;
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}
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}
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this.tokens.copyToken();
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}
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/**
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* Skip past a class with a name and return that name.
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*/
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processNamedClass() {
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if (!this.tokens.matches2(_types.TokenType._class, _types.TokenType.name)) {
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throw new Error("Expected identifier for exported class name.");
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}
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const name = this.tokens.identifierNameAtIndex(this.tokens.currentIndex() + 1);
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this.processClass();
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return name;
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}
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processClass() {
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const classInfo = _getClassInfo2.default.call(void 0, this, this.tokens, this.nameManager, this.disableESTransforms);
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// Both static and instance initializers need a class name to use to invoke the initializer, so
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// assign to one if necessary.
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const needsCommaExpression =
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(classInfo.headerInfo.isExpression || !classInfo.headerInfo.className) &&
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classInfo.staticInitializerNames.length + classInfo.instanceInitializerNames.length > 0;
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let className = classInfo.headerInfo.className;
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if (needsCommaExpression) {
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className = this.nameManager.claimFreeName("_class");
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this.generatedVariables.push(className);
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this.tokens.appendCode(` (${className} =`);
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}
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const classToken = this.tokens.currentToken();
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const contextId = classToken.contextId;
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if (contextId == null) {
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throw new Error("Expected class to have a context ID.");
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}
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this.tokens.copyExpectedToken(_types.TokenType._class);
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while (!this.tokens.matchesContextIdAndLabel(_types.TokenType.braceL, contextId)) {
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this.processToken();
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}
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this.processClassBody(classInfo, className);
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const staticInitializerStatements = classInfo.staticInitializerNames.map(
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(name) => `${className}.${name}()`,
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);
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if (needsCommaExpression) {
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this.tokens.appendCode(
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`, ${staticInitializerStatements.map((s) => `${s}, `).join("")}${className})`,
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);
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} else if (classInfo.staticInitializerNames.length > 0) {
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this.tokens.appendCode(` ${staticInitializerStatements.map((s) => `${s};`).join(" ")}`);
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}
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}
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/**
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* We want to just handle class fields in all contexts, since TypeScript supports them. Later,
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* when some JS implementations support class fields, this should be made optional.
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*/
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processClassBody(classInfo, className) {
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const {
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headerInfo,
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constructorInsertPos,
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constructorInitializerStatements,
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fields,
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instanceInitializerNames,
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rangesToRemove,
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} = classInfo;
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let fieldIndex = 0;
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let rangeToRemoveIndex = 0;
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const classContextId = this.tokens.currentToken().contextId;
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if (classContextId == null) {
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throw new Error("Expected non-null context ID on class.");
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}
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this.tokens.copyExpectedToken(_types.TokenType.braceL);
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if (this.isReactHotLoaderTransformEnabled) {
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this.tokens.appendCode(
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"__reactstandin__regenerateByEval(key, code) {this[key] = eval(code);}",
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);
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}
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const needsConstructorInit =
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constructorInitializerStatements.length + instanceInitializerNames.length > 0;
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if (constructorInsertPos === null && needsConstructorInit) {
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const constructorInitializersCode = this.makeConstructorInitCode(
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constructorInitializerStatements,
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instanceInitializerNames,
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className,
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);
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if (headerInfo.hasSuperclass) {
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const argsName = this.nameManager.claimFreeName("args");
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this.tokens.appendCode(
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`constructor(...${argsName}) { super(...${argsName}); ${constructorInitializersCode}; }`,
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);
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} else {
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this.tokens.appendCode(`constructor() { ${constructorInitializersCode}; }`);
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}
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}
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while (!this.tokens.matchesContextIdAndLabel(_types.TokenType.braceR, classContextId)) {
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if (fieldIndex < fields.length && this.tokens.currentIndex() === fields[fieldIndex].start) {
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let needsCloseBrace = false;
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if (this.tokens.matches1(_types.TokenType.bracketL)) {
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this.tokens.copyTokenWithPrefix(`${fields[fieldIndex].initializerName}() {this`);
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} else if (this.tokens.matches1(_types.TokenType.string) || this.tokens.matches1(_types.TokenType.num)) {
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this.tokens.copyTokenWithPrefix(`${fields[fieldIndex].initializerName}() {this[`);
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needsCloseBrace = true;
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} else {
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this.tokens.copyTokenWithPrefix(`${fields[fieldIndex].initializerName}() {this.`);
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}
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while (this.tokens.currentIndex() < fields[fieldIndex].end) {
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if (needsCloseBrace && this.tokens.currentIndex() === fields[fieldIndex].equalsIndex) {
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this.tokens.appendCode("]");
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}
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this.processToken();
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}
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this.tokens.appendCode("}");
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fieldIndex++;
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} else if (
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rangeToRemoveIndex < rangesToRemove.length &&
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this.tokens.currentIndex() >= rangesToRemove[rangeToRemoveIndex].start
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) {
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if (this.tokens.currentIndex() < rangesToRemove[rangeToRemoveIndex].end) {
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this.tokens.removeInitialToken();
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}
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while (this.tokens.currentIndex() < rangesToRemove[rangeToRemoveIndex].end) {
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this.tokens.removeToken();
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}
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rangeToRemoveIndex++;
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} else if (this.tokens.currentIndex() === constructorInsertPos) {
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this.tokens.copyToken();
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if (needsConstructorInit) {
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this.tokens.appendCode(
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`;${this.makeConstructorInitCode(
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constructorInitializerStatements,
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instanceInitializerNames,
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className,
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)};`,
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);
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}
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this.processToken();
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} else {
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this.processToken();
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}
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}
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this.tokens.copyExpectedToken(_types.TokenType.braceR);
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}
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makeConstructorInitCode(
|
||
|
|
constructorInitializerStatements,
|
||
|
|
instanceInitializerNames,
|
||
|
|
className,
|
||
|
|
) {
|
||
|
|
return [
|
||
|
|
...constructorInitializerStatements,
|
||
|
|
...instanceInitializerNames.map((name) => `${className}.prototype.${name}.call(this)`),
|
||
|
|
].join(";");
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Normally it's ok to simply remove type tokens, but we need to be more careful when dealing with
|
||
|
|
* arrow function return types since they can confuse the parser. In that case, we want to move
|
||
|
|
* the close-paren to the same line as the arrow.
|
||
|
|
*
|
||
|
|
* See https://github.com/alangpierce/sucrase/issues/391 for more details.
|
||
|
|
*/
|
||
|
|
processPossibleArrowParamEnd() {
|
||
|
|
if (this.tokens.matches2(_types.TokenType.parenR, _types.TokenType.colon) && this.tokens.tokenAtRelativeIndex(1).isType) {
|
||
|
|
let nextNonTypeIndex = this.tokens.currentIndex() + 1;
|
||
|
|
// Look ahead to see if this is an arrow function or something else.
|
||
|
|
while (this.tokens.tokens[nextNonTypeIndex].isType) {
|
||
|
|
nextNonTypeIndex++;
|
||
|
|
}
|
||
|
|
if (this.tokens.matches1AtIndex(nextNonTypeIndex, _types.TokenType.arrow)) {
|
||
|
|
this.tokens.removeInitialToken();
|
||
|
|
while (this.tokens.currentIndex() < nextNonTypeIndex) {
|
||
|
|
this.tokens.removeToken();
|
||
|
|
}
|
||
|
|
this.tokens.replaceTokenTrimmingLeftWhitespace(") =>");
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* An async arrow function might be of the form:
|
||
|
|
*
|
||
|
|
* async <
|
||
|
|
* T
|
||
|
|
* >() => {}
|
||
|
|
*
|
||
|
|
* in which case, removing the type parameters will cause a syntax error. Detect this case and
|
||
|
|
* move the open-paren earlier.
|
||
|
|
*/
|
||
|
|
processPossibleAsyncArrowWithTypeParams() {
|
||
|
|
if (
|
||
|
|
!this.tokens.matchesContextual(_keywords.ContextualKeyword._async) &&
|
||
|
|
!this.tokens.matches1(_types.TokenType._async)
|
||
|
|
) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
const nextToken = this.tokens.tokenAtRelativeIndex(1);
|
||
|
|
if (nextToken.type !== _types.TokenType.lessThan || !nextToken.isType) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
let nextNonTypeIndex = this.tokens.currentIndex() + 1;
|
||
|
|
// Look ahead to see if this is an arrow function or something else.
|
||
|
|
while (this.tokens.tokens[nextNonTypeIndex].isType) {
|
||
|
|
nextNonTypeIndex++;
|
||
|
|
}
|
||
|
|
if (this.tokens.matches1AtIndex(nextNonTypeIndex, _types.TokenType.parenL)) {
|
||
|
|
this.tokens.replaceToken("async (");
|
||
|
|
this.tokens.removeInitialToken();
|
||
|
|
while (this.tokens.currentIndex() < nextNonTypeIndex) {
|
||
|
|
this.tokens.removeToken();
|
||
|
|
}
|
||
|
|
this.tokens.removeToken();
|
||
|
|
// We ate a ( token, so we need to process the tokens in between and then the ) token so that
|
||
|
|
// we remain balanced.
|
||
|
|
this.processBalancedCode();
|
||
|
|
this.processToken();
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
processPossibleTypeRange() {
|
||
|
|
if (this.tokens.currentToken().isType) {
|
||
|
|
this.tokens.removeInitialToken();
|
||
|
|
while (this.tokens.currentToken().isType) {
|
||
|
|
this.tokens.removeToken();
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
shiftMappings(
|
||
|
|
mappings,
|
||
|
|
prefixLength,
|
||
|
|
) {
|
||
|
|
for (let i = 0; i < mappings.length; i++) {
|
||
|
|
const mapping = mappings[i];
|
||
|
|
if (mapping !== undefined) {
|
||
|
|
mappings[i] = mapping + prefixLength;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return mappings;
|
||
|
|
}
|
||
|
|
} exports.default = RootTransformer;
|