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import {
ConstantTypes,
type ExpressionNode,
type NodeTransform,
NodeTypes,
type SimpleExpressionNode,
type SourceLocation,
type TransformContext,
createSimpleExpression,
} from '@vue/compiler-core'
import {
isDataUrl,
isExternalUrl,
isRelativeUrl,
normalizeDecodedImportPath,
parseUrl,
} 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
}
// Built-in attrs that always represent resource URLs. `use` is intentionally
// omitted because its hash-only values may still be fragment references.
const resourceUrlTagConfig: AssetURLTagConfig = {
video: ['src', 'poster'],
source: ['src'],
img: ['src'],
image: ['xlink:href', 'href'],
}
export const defaultAssetUrlOptions: Required<AssetURLOptions> = {
base: null,
includeAbsolute: false,
tags: {
...resourceUrlTagConfig,
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)
}
function canTransformHashImport(tag: string, attrName: string): boolean {
return !!resourceUrlTagConfig[tag]?.includes(attrName)
}
/**
* 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
) {
return
}
const urlValue = attr.value.content
const isHashOnlyValue = urlValue[0] === '#'
if (
isExternalUrl(urlValue) ||
isDataUrl(urlValue) ||
(isHashOnlyValue && !canTransformHashImport(node.tag, attr.name)) ||
(!options.includeAbsolute && !isRelativeUrl(urlValue))
) {
return
}
const url = parseUrl(urlValue)
if (options.base && urlValue[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,
}
})
}
}
/**
* Resolves or registers an import for the given source path
* @param source - Path to resolve import for
* @param loc - Source location
* @param context - Transform context
* @returns Object containing import name and expression
*/
function resolveOrRegisterImport(
source: string,
loc: SourceLocation,
context: TransformContext,
): {
name: string
exp: SimpleExpressionNode
} {
const normalizedSource = normalizeDecodedImportPath(source)
const existingIndex = context.imports.findIndex(
i => i.path === normalizedSource,
)
if (existingIndex > -1) {
return {
name: `_imports_${existingIndex}`,
exp: context.imports[existingIndex].exp as SimpleExpressionNode,
}
}
const name = `_imports_${context.imports.length}`
const exp = createSimpleExpression(
name,
false,
loc,
ConstantTypes.CAN_STRINGIFY,
)
// We need to ensure the path is not encoded (to %2F),
// so we decode it back in case it is encoded
context.imports.push({
exp,
path: normalizedSource,
})
return { name, exp }
}
/**
* Transforms asset URLs into import expressions or string literals
*/
function getImportsExpressionExp(
path: string | null,
hash: string | null,
loc: SourceLocation,
context: TransformContext,
): ExpressionNode {
// Neither path nor hash - return empty string
if (!path && !hash) {
return createSimpleExpression(`''`, false, loc, ConstantTypes.CAN_STRINGIFY)
}
// Only hash without path - treat hash as the import source (likely a subpath import)
if (!path && hash) {
const { exp } = resolveOrRegisterImport(hash, loc, context)
return exp
}
// Only path without hash - straightforward import
if (path && !hash) {
const { exp } = resolveOrRegisterImport(path, loc, context)
return exp
}
// At this point, we know we have both path and hash components
const { name } = resolveOrRegisterImport(path!, loc, context)
// Combine path import with hash
const hashExp = `${name} + '${hash}'`
const finalExp = createSimpleExpression(
hashExp,
false,
loc,
ConstantTypes.CAN_STRINGIFY,
)
// No hoisting needed
Iif (!context.hoistStatic) {
return finalExp
}
// Check for existing hoisted expression
const existingHoistIndex = context.hoists.findIndex(h => {
return (
h &&
h.type === NodeTypes.SIMPLE_EXPRESSION &&
!h.isStatic &&
h.content === hashExp
)
})
// Return existing hoisted expression if found
if (existingHoistIndex > -1) {
return createSimpleExpression(
`_hoisted_${existingHoistIndex + 1}`,
false,
loc,
ConstantTypes.CAN_STRINGIFY,
)
}
// Hoist the expression and return the hoisted expression
return context.hoist(finalExp)
}
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