142 lines
3.8 KiB
JavaScript
142 lines
3.8 KiB
JavaScript
'use strict'
|
|
|
|
let { SourceMapConsumer, SourceMapGenerator } = require('source-map-js')
|
|
let { existsSync, readFileSync } = require('fs')
|
|
let { dirname, join } = require('path')
|
|
|
|
function fromBase64(str) {
|
|
if (Buffer) {
|
|
return Buffer.from(str, 'base64').toString()
|
|
} else {
|
|
/* c8 ignore next 2 */
|
|
return window.atob(str)
|
|
}
|
|
}
|
|
|
|
class PreviousMap {
|
|
constructor(css, opts) {
|
|
if (opts.map === false) return
|
|
this.loadAnnotation(css)
|
|
this.inline = this.startWith(this.annotation, 'data:')
|
|
|
|
let prev = opts.map ? opts.map.prev : undefined
|
|
let text = this.loadMap(opts.from, prev)
|
|
if (!this.mapFile && opts.from) {
|
|
this.mapFile = opts.from
|
|
}
|
|
if (this.mapFile) this.root = dirname(this.mapFile)
|
|
if (text) this.text = text
|
|
}
|
|
|
|
consumer() {
|
|
if (!this.consumerCache) {
|
|
this.consumerCache = new SourceMapConsumer(this.text)
|
|
}
|
|
return this.consumerCache
|
|
}
|
|
|
|
decodeInline(text) {
|
|
let baseCharsetUri = /^data:application\/json;charset=utf-?8;base64,/
|
|
let baseUri = /^data:application\/json;base64,/
|
|
let charsetUri = /^data:application\/json;charset=utf-?8,/
|
|
let uri = /^data:application\/json,/
|
|
|
|
if (charsetUri.test(text) || uri.test(text)) {
|
|
return decodeURIComponent(text.substr(RegExp.lastMatch.length))
|
|
}
|
|
|
|
if (baseCharsetUri.test(text) || baseUri.test(text)) {
|
|
return fromBase64(text.substr(RegExp.lastMatch.length))
|
|
}
|
|
|
|
let encoding = text.match(/data:application\/json;([^,]+),/)[1]
|
|
throw new Error('Unsupported source map encoding ' + encoding)
|
|
}
|
|
|
|
getAnnotationURL(sourceMapString) {
|
|
return sourceMapString.replace(/^\/\*\s*# sourceMappingURL=/, '').trim()
|
|
}
|
|
|
|
isMap(map) {
|
|
if (typeof map !== 'object') return false
|
|
return (
|
|
typeof map.mappings === 'string' ||
|
|
typeof map._mappings === 'string' ||
|
|
Array.isArray(map.sections)
|
|
)
|
|
}
|
|
|
|
loadAnnotation(css) {
|
|
let comments = css.match(/\/\*\s*# sourceMappingURL=/gm)
|
|
if (!comments) return
|
|
|
|
// sourceMappingURLs from comments, strings, etc.
|
|
let start = css.lastIndexOf(comments.pop())
|
|
let end = css.indexOf('*/', start)
|
|
|
|
if (start > -1 && end > -1) {
|
|
// Locate the last sourceMappingURL to avoid pickin
|
|
this.annotation = this.getAnnotationURL(css.substring(start, end))
|
|
}
|
|
}
|
|
|
|
loadFile(path) {
|
|
this.root = dirname(path)
|
|
if (existsSync(path)) {
|
|
this.mapFile = path
|
|
return readFileSync(path, 'utf-8').toString().trim()
|
|
}
|
|
}
|
|
|
|
loadMap(file, prev) {
|
|
if (prev === false) return false
|
|
|
|
if (prev) {
|
|
if (typeof prev === 'string') {
|
|
return prev
|
|
} else if (typeof prev === 'function') {
|
|
let prevPath = prev(file)
|
|
if (prevPath) {
|
|
let map = this.loadFile(prevPath)
|
|
if (!map) {
|
|
throw new Error(
|
|
'Unable to load previous source map: ' + prevPath.toString()
|
|
)
|
|
}
|
|
return map
|
|
}
|
|
} else if (prev instanceof SourceMapConsumer) {
|
|
return SourceMapGenerator.fromSourceMap(prev).toString()
|
|
} else if (prev instanceof SourceMapGenerator) {
|
|
return prev.toString()
|
|
} else if (this.isMap(prev)) {
|
|
return JSON.stringify(prev)
|
|
} else {
|
|
throw new Error(
|
|
'Unsupported previous source map format: ' + prev.toString()
|
|
)
|
|
}
|
|
} else if (this.inline) {
|
|
return this.decodeInline(this.annotation)
|
|
} else if (this.annotation) {
|
|
let map = this.annotation
|
|
if (file) map = join(dirname(file), map)
|
|
return this.loadFile(map)
|
|
}
|
|
}
|
|
|
|
startWith(string, start) {
|
|
if (!string) return false
|
|
return string.substr(0, start.length) === start
|
|
}
|
|
|
|
withContent() {
|
|
return !!(
|
|
this.consumer().sourcesContent &&
|
|
this.consumer().sourcesContent.length > 0
|
|
)
|
|
}
|
|
}
|
|
|
|
module.exports = PreviousMap
|
|
PreviousMap.default = PreviousMap
|