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https://github.com/zhigang1992/react-native.git
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eda09f89c9
Summary: Adds utilities needed for bundle creation: `completeModuleWrapper` appends numeric IDs for the module itself and its dependencies to a module wrapped. `createGetModuleId` returns a function that returns sequential numeric IDs for strings, and is idempotent. Reviewed By: cpojer Differential Revision: D4240334 fbshipit-source-id: c165482ebcf0e81ebb83ba6ff634de095ffb6bf0
53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
/**
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @flow
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*/
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'use strict';
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import type {Module} from '../types.flow';
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// Transformed modules have the form
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// __d(function(require, module, global, exports, dependencyMap) {
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// /* code */
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// });
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//
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// This function adds the numeric module ID, and an array with dependencies of
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// the dependencies of the module before the closing parenthesis.
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exports.addModuleIdsToModuleWrapper = (
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module: Module,
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idForPath: {path: string} => number,
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): string => {
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const {dependencies, file} = module;
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const {code} = file;
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const index = code.lastIndexOf(')');
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const depencyIds =
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dependencies.length ? `, [${dependencies.map(idForPath).join(', ')}]` : '';
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return (
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code.slice(0, index) +
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`, ${idForPath(file)}` +
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depencyIds +
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code.slice(index)
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);
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};
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// Creates an idempotent function that returns numeric IDs for objects based
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// on their `path` property.
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exports.createIdForPathFn = (): ({path: string} => number) => {
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const seen = new Map();
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let next = 0;
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return ({path}) => {
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let id = seen.get(path);
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if (id == null) {
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id = next++;
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seen.set(path, id);
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}
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return id;
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};
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};
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