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import {
ConstantTypes,
createCompoundExpression,
createSimpleExpression,
NodeTransform,
NodeTypes,
SimpleExpressionNode
} from '@vue/compiler-core'
import {
isRelativeUrl,
parseUrl,
isExternalUrl,
isDataUrl
} from './templateUtils'
import {
AssetURLOptions,
defaultAssetUrlOptions
} from './templateTransformAssetUrl'
const srcsetTags = ['img', 'source']
interface ImageCandidate {
url: string
descriptor: string
}
// http://w3c.github.io/html/semantics-embedded-content.html#ref-for-image-candidate-string-5
const escapedSpaceCharacters = /( |\\t|\\n|\\f|\\r)+/g
export const createSrcsetTransformWithOptions = (
options: Required<AssetURLOptions>
): NodeTransform => {
return (node, context) =>
(transformSrcset as Function)(node, context, options)
}
export const transformSrcset: NodeTransform = (
node,
context,
options: Required<AssetURLOptions> = defaultAssetUrlOptions
) => {
if (node.type === NodeTypes.ELEMENT) {
if (srcsetTags.includes(node.tag) && node.props.length) {
node.props.forEach((attr, index) => {
if (attr.name === 'srcset' && attr.type === NodeTypes.ATTRIBUTE) {
Iif (!attr.value) return
const value = attr.value.content
if (!value) return
const imageCandidates: ImageCandidate[] = value.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 { url, descriptor }
})
// data urls contains comma after the encoding so we need to re-merge
// them
for (let i = 0; i < imageCandidates.length; i++) {
const { url } = imageCandidates[i]
if (isDataUrl(url)) {
imageCandidates[i + 1].url =
url + ',' + imageCandidates[i + 1].url
imageCandidates.splice(i, 1)
}
}
const hasQualifiedUrl = imageCandidates.some(({ url }) => {
return (
!isExternalUrl(url) &&
!isDataUrl(url) &&
(options.includeAbsolute || isRelativeUrl(url))
)
})
// When srcset does not contain any qualified URLs, skip transforming
if (!hasQualifiedUrl) {
return
}
if (options.base) {
const base = options.base
const set: string[] = []
imageCandidates.forEach(({ url, descriptor }) => {
descriptor = descriptor ? ` ${descriptor}` : ``
if (isRelativeUrl(url)) {
set.push((path.posix || path).join(base, url) + descriptor)
} else {
set.push(url + descriptor)
}
})
attr.value.content = set.join(', ')
return
}
const compoundExpression = createCompoundExpression([], attr.loc)
imageCandidates.forEach(({ url, descriptor }, index) => {
if (
!isExternalUrl(url) &&
!isDataUrl(url) &&
(options.includeAbsolute || isRelativeUrl(url))
) {
const { path } = parseUrl(url)
let exp: SimpleExpressionNode
if (path) {
const existingImportsIndex = context.imports.findIndex(
i => i.path === path
)
if (existingImportsIndex > -1) {
exp = createSimpleExpression(
`_imports_${existingImportsIndex}`,
false,
attr.loc,
ConstantTypes.CAN_STRINGIFY
)
} else {
exp = createSimpleExpression(
`_imports_${context.imports.length}`,
false,
attr.loc,
ConstantTypes.CAN_STRINGIFY
)
context.imports.push({ exp, path })
}
compoundExpression.children.push(exp)
}
} else {
const exp = createSimpleExpression(
`"${url}"`,
false,
attr.loc,
ConstantTypes.CAN_STRINGIFY
)
compoundExpression.children.push(exp)
}
const isNotLast = imageCandidates.length - 1 > index
if (descriptor && isNotLast) {
compoundExpression.children.push(` + ' ${descriptor}, ' + `)
} else if (descriptor) {
compoundExpression.children.push(` + ' ${descriptor}'`)
} else if (isNotLast) {
compoundExpression.children.push(` + ', ' + `)
}
})
const hoisted = context.hoist(compoundExpression)
hoisted.constType = ConstantTypes.CAN_STRINGIFY
node.props[index] = {
type: NodeTypes.DIRECTIVE,
name: 'bind',
arg: createSimpleExpression('srcset', true, attr.loc),
exp: hoisted,
modifiers: [],
loc: attr.loc
}
}
})
}
}
}
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