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import {
ConstantTypes,
createSimpleExpression,
ExpressionNode,
NodeTransform,
NodeTypes,
SimpleExpressionNode,
SourceLocation,
TransformContext
} from '@vue/compiler-core'
import {
isRelativeUrl,
parseUrl,
isExternalUrl,
isDataUrl
} from './templateUtils'
import { isArray } from '@vue/shared'
export interface AssetURLTagConfig {
[name: string]: string[]
}
export interface AssetURLOptions {
/**
* If base is provided, instead of transforming relative asset urls into
* imports, they will be directly rewritten to absolute urls.
*/
base?: string | null
/**
* If true, also processes absolute urls.
*/
includeAbsolute?: boolean
tags?: AssetURLTagConfig
}
export const defaultAssetUrlOptions: Required<AssetURLOptions> = {
base: null,
includeAbsolute: false,
tags: {
video: ['src', 'poster'],
source: ['src'],
img: ['src'],
image: ['xlink:href', 'href'],
use: ['xlink:href', 'href']
}
}
export const normalizeOptions = (
options: AssetURLOptions | AssetURLTagConfig
): Required<AssetURLOptions> => {
if (Object.keys(options).some(key => isArray((options as any)[key]))) {
// legacy option format which directly passes in tags config
return {
...defaultAssetUrlOptions,
tags: options as any
}
}
return {
...defaultAssetUrlOptions,
...options
}
}
export const createAssetUrlTransformWithOptions = (
options: Required<AssetURLOptions>
): NodeTransform => {
return (node, context) =>
(transformAssetUrl as Function)(node, context, options)
}
/**
* A `@vue/compiler-core` plugin that transforms relative asset urls into
* either imports or absolute urls.
*
* ``` js
* // Before
* createVNode('img', { src: './logo.png' })
*
* // After
* import _imports_0 from './logo.png'
* createVNode('img', { src: _imports_0 })
* ```
*/
export const transformAssetUrl: NodeTransform = (
node,
context,
options: AssetURLOptions = defaultAssetUrlOptions
) => {
if (node.type === NodeTypes.ELEMENT) {
if (!node.props.length) {
return
}
const tags = options.tags || defaultAssetUrlOptions.tags
const attrs = tags[node.tag]
const wildCardAttrs = tags['*']
if (!attrs && !wildCardAttrs) {
return
}
const assetAttrs = (attrs || []).concat(wildCardAttrs || [])
node.props.forEach((attr, index) => {
if (
attr.type !== NodeTypes.ATTRIBUTE ||
!assetAttrs.includes(attr.name) ||
!attr.value ||
isExternalUrl(attr.value.content) ||
isDataUrl(attr.value.content) ||
attr.value.content[0] === '#' ||
(!options.includeAbsolute && !isRelativeUrl(attr.value.content))
) {
return
}
const url = parseUrl(attr.value.content)
if (options.base && attr.value.content[0] === '.') {
// explicit base - directly rewrite relative urls into absolute url
// to avoid generating extra imports
// Allow for full hostnames provided in options.base
const base = parseUrl(options.base)
const protocol = base.protocol || ''
const host = base.host ? protocol + '//' + base.host : ''
const basePath = base.path || '/'
// when packaged in the browser, path will be using the posix-
// only version provided by rollup-plugin-node-builtins.
attr.value.content =
host +
(path.posix || path).join(basePath, url.path + (url.hash || ''))
return
}
// otherwise, transform the url into an import.
// this assumes a bundler will resolve the import into the correct
// absolute url (e.g. webpack file-loader)
const exp = getImportsExpressionExp(url.path, url.hash, attr.loc, context)
node.props[index] = {
type: NodeTypes.DIRECTIVE,
name: 'bind',
arg: createSimpleExpression(attr.name, true, attr.loc),
exp,
modifiers: [],
loc: attr.loc
}
})
}
}
function getImportsExpressionExp(
path: string | null,
hash: string | null,
loc: SourceLocation,
context: TransformContext
): ExpressionNode {
if (path) {
let name: string
let exp: SimpleExpressionNode
const existingIndex = context.imports.findIndex(i => i.path === path)
if (existingIndex > -1) {
name = `_imports_${existingIndex}`
exp = context.imports[existingIndex].exp as SimpleExpressionNode
} else {
name = `_imports_${context.imports.length}`
exp = createSimpleExpression(
name,
false,
loc,
ConstantTypes.CAN_STRINGIFY
)
context.imports.push({ exp, path })
}
if (!hash) {
return exp
}
const hashExp = `${name} + '${hash}'`
const existingHoistIndex = context.hoists.findIndex(h => {
return (
h &&
h.type === NodeTypes.SIMPLE_EXPRESSION &&
!h.isStatic &&
h.content === hashExp
)
})
if (existingHoistIndex > -1) {
return createSimpleExpression(
`_hoisted_${existingHoistIndex + 1}`,
false,
loc,
ConstantTypes.CAN_STRINGIFY
)
}
return context.hoist(
createSimpleExpression(hashExp, false, loc, ConstantTypes.CAN_STRINGIFY)
)
} else {
return createSimpleExpression(`''`, false, loc, ConstantTypes.CAN_STRINGIFY)
}
}
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