// vue compiler module for transforming `<tag>:<attribute>` to `require`
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import { urlToRequire, ASTNode, Attr } from './utils'
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export interface AssetURLOptions {
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[name: string]: string | string[]
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}
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export interface TransformAssetUrlsOptions {
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/**
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* If base is provided, instead of transforming relative asset urls into
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* imports, they will be directly rewritten to absolute urls.
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*/
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base?: string
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}
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const defaultOptions: AssetURLOptions = {
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audio: 'src',
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video: ['src', 'poster'],
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source: 'src',
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img: 'src',
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image: ['xlink:href', 'href'],
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use: ['xlink:href', 'href']
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}
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export default (
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userOptions?: AssetURLOptions,
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transformAssetUrlsOption?: TransformAssetUrlsOptions
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) => {
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const options = userOptions
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? Object.assign({}, defaultOptions, userOptions)
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: defaultOptions
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return {
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postTransformNode: (node: ASTNode) => {
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transform(node, options, transformAssetUrlsOption)
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}
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}
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}
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function transform(
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node: ASTNode,
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options: AssetURLOptions,
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transformAssetUrlsOption?: TransformAssetUrlsOptions
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) {
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for (const tag in options) {
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if ((tag === '*' || node.tag === tag) && node.attrs) {
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const attributes = options[tag]
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if (typeof attributes === 'string') {
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node.attrs.some(attr =>
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rewrite(attr, attributes, transformAssetUrlsOption)
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)
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} else if (Array.isArray(attributes)) {
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attributes.forEach(item =>
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node.attrs.some(attr => rewrite(attr, item, transformAssetUrlsOption))
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)
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}
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}
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}
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}
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function rewrite(
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attr: Attr,
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name: string,
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transformAssetUrlsOption?: TransformAssetUrlsOptions
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) {
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if (attr.name === name) {
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const value = attr.value
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// only transform static URLs
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if (value.charAt(0) === '"' && value.charAt(value.length - 1) === '"') {
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attr.value = urlToRequire(value.slice(1, -1), transformAssetUrlsOption)
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return true
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}
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}
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return false
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}
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