67 lines
1.9 KiB
JavaScript
67 lines
1.9 KiB
JavaScript
/**
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* Copyright (c) 2015-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 {PackagerAsset} from '../../Libraries/Image/AssetRegistry';
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/**
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* FIXME: using number to represent discrete scale numbers is fragile in essence because of
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* floating point numbers imprecision.
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*/
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function getAndroidAssetSuffix(scale: number): string {
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switch (scale) {
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case 0.75: return 'ldpi';
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case 1: return 'mdpi';
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case 1.5: return 'hdpi';
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case 2: return 'xhdpi';
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case 3: return 'xxhdpi';
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case 4: return 'xxxhdpi';
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}
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throw new Error('no such scale');
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}
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function getAndroidDrawableFolderName(asset: PackagerAsset, scale: number) {
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var suffix = getAndroidAssetSuffix(scale);
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if (!suffix) {
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throw new Error(
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'Don\'t know which android drawable suffix to use for asset: ' +
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JSON.stringify(asset)
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);
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}
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const androidFolder = 'drawable-' + suffix;
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return androidFolder;
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}
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function getAndroidResourceIdentifier(asset: PackagerAsset) {
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var folderPath = getBasePath(asset);
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return (folderPath + '/' + asset.name)
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.toLowerCase()
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.replace(/\//g, '_') // Encode folder structure in file name
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.replace(/([^a-z0-9_])/g, '') // Remove illegal chars
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.replace(/^assets_/, ''); // Remove "assets_" prefix
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}
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function getBasePath(asset: PackagerAsset) {
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var basePath = asset.httpServerLocation;
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if (basePath[0] === '/') {
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basePath = basePath.substr(1);
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}
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return basePath;
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}
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module.exports = {
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getAndroidAssetSuffix: getAndroidAssetSuffix,
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getAndroidDrawableFolderName: getAndroidDrawableFolderName,
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getAndroidResourceIdentifier: getAndroidResourceIdentifier,
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getBasePath: getBasePath
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};
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