/
importGlob.ts
173 lines (164 loc) · 4.29 KB
/
importGlob.ts
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import path from 'path'
import glob from 'fast-glob'
import {
isModernFlag,
preloadMethod,
preloadMarker
} from './plugins/importAnalysisBuild'
import { cleanUrl } from './utils'
import { RollupError } from 'rollup'
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: ${msg}`)
;(e as any).pos = pos
return e
}
importer = cleanUrl(importer)
const importerBasename = path.basename(importer)
let [pattern, endIndex] = lexGlobPattern(source, pos)
if (!pattern.startsWith('.') && !pattern.startsWith('/')) {
throw err(`pattern must start with "." or "/" (relative to project root)`)
}
let base: string
let parentDepth = 0
const isAbsolute = pattern.startsWith('/')
if (isAbsolute) {
base = path.resolve(root)
pattern = pattern.slice(1)
} else {
base = path.dirname(importer)
while (pattern.startsWith('../')) {
pattern = pattern.slice(3)
base = path.resolve(base, '../')
parentDepth++
}
if (pattern.startsWith('./')) {
pattern = pattern.slice(2)
}
}
const files = glob.sync(pattern, {
cwd: base,
ignore: ['**/node_modules/**']
})
const imports: string[] = []
let importsString = ``
let entries = ``
for (let i = 0; i < files.length; i++) {
// skip importer itself
if (files[i] === importerBasename) continue
const file = isAbsolute
? `/${files[i]}`
: parentDepth
? `${'../'.repeat(parentDepth)}${files[i]}`
: `./${files[i]}`
let importee = file
if (normalizeUrl) {
;[importee] = await normalizeUrl(file, pos)
}
imports.push(importee)
const identifier = `__glob_${importIndex}_${i}`
if (isEager) {
importsString += `import ${
isEagerDefault ? `` : `* as `
}${identifier} from ${JSON.stringify(importee)};`
entries += ` ${JSON.stringify(file)}: ${identifier},`
} else {
let imp = `import(${JSON.stringify(importee)})`
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, 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')
}
}
return [pattern, code.indexOf(`)`, i) + 1]
}
function error(pos: number) {
const err = new Error(
`import.meta.glob() can only accept string literals.`
) as RollupError
err.pos = pos
throw err
}