/
importGlob.ts
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/
importGlob.ts
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import path from 'path'
import { promises as fsp } from 'fs'
import glob from 'fast-glob'
import JSON5 from 'json5'
import {
isModernFlag,
preloadMethod,
preloadMarker
} from './plugins/importAnalysisBuild'
import { isCSSRequest } from './plugins/css'
import {
cleanUrl,
singlelineCommentsRE,
multilineCommentsRE,
blankReplacer
} from './utils'
import type { RollupError } from 'rollup'
export interface AssertOptions {
assert?: {
type: string
}
}
export async function transformImportGlob(
source: string,
pos: number,
importer: string,
importIndex: number,
root: string,
normalizeUrl?: (url: string, pos: number) => Promise<[string, string]>,
preload = true
): Promise<{
importsString: string
imports: string[]
exp: string
endIndex: number
isEager: boolean
pattern: string
base: string
}> {
const isEager = source.slice(pos, pos + 21) === 'import.meta.globEager'
const isEagerDefault =
isEager && source.slice(pos + 21, pos + 28) === 'Default'
const err = (msg: string) => {
const e = new Error(`Invalid glob import syntax: ${msg}`)
;(e as any).pos = pos
return e
}
importer = cleanUrl(importer)
const importerBasename = path.basename(importer)
let [pattern, assertion, endIndex] = lexGlobPattern(source, pos)
if (!pattern.startsWith('.') && !pattern.startsWith('/')) {
throw err(`pattern must start with "." or "/" (relative to project root)`)
}
let base: string
let parentDepth = 0
const isAbsolute = pattern.startsWith('/')
if (isAbsolute) {
base = path.resolve(root)
pattern = pattern.slice(1)
} else {
base = path.dirname(importer)
while (pattern.startsWith('../')) {
pattern = pattern.slice(3)
base = path.resolve(base, '../')
parentDepth++
}
if (pattern.startsWith('./')) {
pattern = pattern.slice(2)
}
}
const files = glob.sync(pattern, {
cwd: base,
// Ignore node_modules by default unless explicitly indicated in the pattern
ignore: /(^|\/)node_modules\//.test(pattern) ? [] : ['**/node_modules/**']
})
const imports: string[] = []
let importsString = ``
let entries = ``
for (let i = 0; i < files.length; i++) {
// skip importer itself
if (files[i] === importerBasename) continue
const file = isAbsolute
? `/${files[i]}`
: parentDepth
? `${'../'.repeat(parentDepth)}${files[i]}`
: `./${files[i]}`
let importee = file
if (normalizeUrl) {
;[importee] = await normalizeUrl(file, pos)
}
imports.push(importee)
if (assertion?.assert?.type === 'raw') {
entries += ` ${JSON.stringify(file)}: ${JSON.stringify(
await fsp.readFile(path.join(base, file), 'utf-8')
)},`
} else {
const importeeUrl = isCSSRequest(importee) ? `${importee}?used` : importee
if (isEager) {
const identifier = `__glob_${importIndex}_${i}`
// css imports injecting a ?used query to export the css string
importsString += `import ${
isEagerDefault ? `` : `* as `
}${identifier} from ${JSON.stringify(importeeUrl)};`
entries += ` ${JSON.stringify(file)}: ${identifier},`
} else {
let imp = `import(${JSON.stringify(importeeUrl)})`
if (!normalizeUrl && preload) {
imp =
`(${isModernFlag}` +
`? ${preloadMethod}(()=>${imp},"${preloadMarker}")` +
`: ${imp})`
}
entries += ` ${JSON.stringify(file)}: () => ${imp},`
}
}
}
return {
imports,
importsString,
exp: `{${entries}}`,
endIndex,
isEager,
pattern,
base
}
}
const enum LexerState {
inCall,
inSingleQuoteString,
inDoubleQuoteString,
inTemplateString
}
function lexGlobPattern(
code: string,
pos: number
): [string, AssertOptions, number] {
let state = LexerState.inCall
let pattern = ''
let i = code.indexOf(`(`, pos) + 1
outer: for (; i < code.length; i++) {
const char = code.charAt(i)
switch (state) {
case LexerState.inCall:
if (char === `'`) {
state = LexerState.inSingleQuoteString
} else if (char === `"`) {
state = LexerState.inDoubleQuoteString
} else if (char === '`') {
state = LexerState.inTemplateString
} else if (/\s/.test(char)) {
continue
} else {
error(i)
}
break
case LexerState.inSingleQuoteString:
if (char === `'`) {
break outer
} else {
pattern += char
}
break
case LexerState.inDoubleQuoteString:
if (char === `"`) {
break outer
} else {
pattern += char
}
break
case LexerState.inTemplateString:
if (char === '`') {
break outer
} else {
pattern += char
}
break
default:
throw new Error('unknown import.meta.glob lexer state')
}
}
const noCommentCode = code
.slice(i + 1)
.replace(singlelineCommentsRE, blankReplacer)
.replace(multilineCommentsRE, blankReplacer)
const endIndex = noCommentCode.indexOf(')')
const options = noCommentCode.substring(0, endIndex)
const commaIndex = options.indexOf(',')
let assert = {}
if (commaIndex > -1) {
assert = JSON5.parse(options.substring(commaIndex + 1))
}
return [pattern, assert, endIndex + i + 2]
}
function error(pos: number) {
const err = new Error(
`import.meta.glob() can only accept string literals.`
) as RollupError
err.pos = pos
throw err
}