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<a href="../../index.html">All files</a> / <a href="index.html">lib/templateCompilerModules</a> srcset.ts
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<div class='fl pad1y space-right2'>
<span class="strong">94.12% </span>
<span class="quiet">Statements</span>
<span class='fraction'>16/17</span>
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<div class='fl pad1y space-right2'>
<span class="strong">91.67% </span>
<span class="quiet">Branches</span>
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<span class="strong">100% </span>
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<span class="strong">94.12% </span>
<span class="quiet">Lines</span>
<span class='fraction'>16/17</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">// vue compiler module for transforming `img:srcset` to a number of `require`s
import { urlToRequire, ASTNode } from './utils'
interface ImageCandidate {
require: string
descriptor: string
}
export default () => ({
postTransformNode: (node: ASTNode) => {
transform(node)
}
})
// http://w3c.github.io/html/semantics-embedded-content.html#ref-for-image-candidate-string-5
const escapedSpaceCharacters = /( |\\t|\\n|\\f|\\r)+/g
function transform(node: ASTNode) {
const tags = ['img', 'source']
if (tags.indexOf(node.tag) !== -1 && node.attrs) {
node.attrs.forEach(attr => {
if (attr.name === 'srcset') {
// same logic as in transform-require.js
const value = attr.value
const isStatic =
value.charAt(0) === '"' && value.charAt(value.length - 1) === '"'
<span class="missing-if-branch" title="if path not taken" >I</span>if (!isStatic) {
<span class="cstat-no" title="statement not covered" > return</span>
}
const imageCandidates: ImageCandidate[] = value
.substr(1, value.length - 2)
.split(',')
.map(s => {
// The attribute value arrives here with all whitespace, except
// normal spaces, represented by escape sequences
const [url, descriptor] = s
.replace(escapedSpaceCharacters, ' ')
.trim()
.split(' ', 2)
return { require: urlToRequire(url), descriptor }
})
// "require(url1)"
// "require(url1) 1x"
// "require(url1), require(url2)"
// "require(url1), require(url2) 2x"
// "require(url1) 1x, require(url2)"
// "require(url1) 1x, require(url2) 2x"
const code = imageCandidates
.map(
({ require, descriptor }) =>
`${require} + "${descriptor ? ' ' + descriptor : ''}, " + `
)
.join('')
.slice(0, -6)
.concat('"')
.replace(/ \+ ""$/, '')
attr.value = code
}
})
}
}
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