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54 lines
2.3 KiB
54 lines
2.3 KiB
"use strict"; |
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// vue compiler module for transforming `img:srcset` to a number of `require`s |
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Object.defineProperty(exports, "__esModule", { value: true }); |
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const utils_1 = require("./utils"); |
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exports.default = (transformAssetUrlsOptions) => ({ |
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postTransformNode: (node) => { |
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transform(node, transformAssetUrlsOptions); |
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} |
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}); |
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// http://w3c.github.io/html/semantics-embedded-content.html#ref-for-image-candidate-string-5 |
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const escapedSpaceCharacters = /( |\\t|\\n|\\f|\\r)+/g; |
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function transform(node, transformAssetUrlsOptions) { |
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const tags = ['img', 'source']; |
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if (tags.indexOf(node.tag) !== -1 && node.attrs) { |
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node.attrs.forEach(attr => { |
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if (attr.name === 'srcset') { |
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// same logic as in transform-require.js |
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const value = attr.value; |
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const isStatic = value.charAt(0) === '"' && value.charAt(value.length - 1) === '"'; |
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if (!isStatic) { |
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return; |
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} |
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const imageCandidates = value |
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.substr(1, value.length - 2) |
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.split(',') |
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.map(s => { |
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// The attribute value arrives here with all whitespace, except |
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// normal spaces, represented by escape sequences |
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const [url, descriptor] = s |
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.replace(escapedSpaceCharacters, ' ') |
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.trim() |
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.split(' ', 2); |
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return { |
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require: utils_1.urlToRequire(url, transformAssetUrlsOptions), |
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descriptor |
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}; |
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}); |
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// "require(url1)" |
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// "require(url1) 1x" |
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// "require(url1), require(url2)" |
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// "require(url1), require(url2) 2x" |
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// "require(url1) 1x, require(url2)" |
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// "require(url1) 1x, require(url2) 2x" |
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const code = imageCandidates |
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.map(({ require, descriptor }) => `${require} + "${descriptor ? ' ' + descriptor : ''}, " + `) |
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.join('') |
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.slice(0, -6) |
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.concat('"') |
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.replace(/ \+ ""$/, ''); |
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attr.value = code; |
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} |
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}); |
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} |
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}
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