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'use strict'
let { SourceMapConsumer, SourceMapGenerator } = require('source-map-js')
let { dirname, relative, resolve, sep } = require('path')
let { pathToFileURL } = require('url')
let Input = require('./input')
let sourceMapAvailable = Boolean(SourceMapConsumer && SourceMapGenerator)
let pathAvailable = Boolean(dirname && resolve && relative && sep)
class MapGenerator {
constructor(stringify, root, opts, cssString) {
this.stringify = stringify
this.mapOpts = opts.map || {}
this.root = root
this.opts = opts
this.css = cssString
this.originalCSS = cssString
this.usesFileUrls = !this.mapOpts.from && this.mapOpts.absolute
this.memoizedFileURLs = new Map()
this.memoizedPaths = new Map()
this.memoizedURLs = new Map()
}
addAnnotation() {
let content
if (this.isInline()) {
content =
'data:application/json;base64,' + this.toBase64(this.map.toString())
} else if (typeof this.mapOpts.annotation === 'string') {
content = this.mapOpts.annotation
} else if (typeof this.mapOpts.annotation === 'function') {
content = this.mapOpts.annotation(this.opts.to, this.root)
} else {
content = this.outputFile() + '.map'
}
let eol = '\n'
if (this.css.includes('\r\n')) eol = '\r\n'
this.css += eol + '/*# sourceMappingURL=' + content + ' */'
}
applyPrevMaps() {
for (let prev of this.previous()) {
let from = this.toUrl(this.path(prev.file))
let root = prev.root || dirname(prev.file)
let map
if (this.mapOpts.sourcesContent === false) {
map = new SourceMapConsumer(prev.text)
if (map.sourcesContent) {
map.sourcesContent = null
}
} else {
map = prev.consumer()
}
this.map.applySourceMap(map, from, this.toUrl(this.path(root)))
}
}
clearAnnotation() {
if (this.mapOpts.annotation === false) return
if (this.root) {
let node
for (let i = this.root.nodes.length - 1; i >= 0; i--) {
node = this.root.nodes[i]
if (node.type !== 'comment') continue
if (node.text.indexOf('# sourceMappingURL=') === 0) {
this.root.removeChild(i)
}
}
} else if (this.css) {
this.css = this.css.replace(/\n*?\/\*#[\S\s]*?\*\/$/gm, '')
}
}
generate() {
this.clearAnnotation()
if (pathAvailable && sourceMapAvailable && this.isMap()) {
return this.generateMap()
} else {
let result = ''
this.stringify(this.root, i => {
result += i
})
return [result]
}
}
generateMap() {
if (this.root) {
this.generateString()
} else if (this.previous().length === 1) {
let prev = this.previous()[0].consumer()
prev.file = this.outputFile()
this.map = SourceMapGenerator.fromSourceMap(prev)
} else {
this.map = new SourceMapGenerator({ file: this.outputFile() })
this.map.addMapping({
generated: { column: 0, line: 1 },
original: { column: 0, line: 1 },
source: this.opts.from
? this.toUrl(this.path(this.opts.from))
: '<no source>'
})
}
if (this.isSourcesContent()) this.setSourcesContent()
if (this.root && this.previous().length > 0) this.applyPrevMaps()
if (this.isAnnotation()) this.addAnnotation()
if (this.isInline()) {
return [this.css]
} else {
return [this.css, this.map]
}
}
generateString() {
this.css = ''
this.map = new SourceMapGenerator({ file: this.outputFile() })
let line = 1
let column = 1
let noSource = '<no source>'
let mapping = {
generated: { column: 0, line: 0 },
original: { column: 0, line: 0 },
source: ''
}
let lines, last
this.stringify(this.root, (str, node, type) => {
this.css += str
if (node && type !== 'end') {
mapping.generated.line = line
mapping.generated.column = column - 1
if (node.source && node.source.start) {
mapping.source = this.sourcePath(node)
mapping.original.line = node.source.start.line
mapping.original.column = node.source.start.column - 1
this.map.addMapping(mapping)
} else {
mapping.source = noSource
mapping.original.line = 1
mapping.original.column = 0
this.map.addMapping(mapping)
}
}
lines = str.match(/\n/g)
if (lines) {
line += lines.length
last = str.lastIndexOf('\n')
column = str.length - last
} else {
column += str.length
}
if (node && type !== 'start') {
let p = node.parent || { raws: {} }
let childless =
node.type === 'decl' || (node.type === 'atrule' && !node.nodes)
if (!childless || node !== p.last || p.raws.semicolon) {
if (node.source && node.source.end) {
mapping.source = this.sourcePath(node)
mapping.original.line = node.source.end.line
mapping.original.column = node.source.end.column - 1
mapping.generated.line = line
mapping.generated.column = column - 2
this.map.addMapping(mapping)
} else {
mapping.source = noSource
mapping.original.line = 1
mapping.original.column = 0
mapping.generated.line = line
mapping.generated.column = column - 1
this.map.addMapping(mapping)
}
}
}
})
}
isAnnotation() {
if (this.isInline()) {
return true
}
if (typeof this.mapOpts.annotation !== 'undefined') {
return this.mapOpts.annotation
}
if (this.previous().length) {
return this.previous().some(i => i.annotation)
}
return true
}
isInline() {
if (typeof this.mapOpts.inline !== 'undefined') {
return this.mapOpts.inline
}
let annotation = this.mapOpts.annotation
if (typeof annotation !== 'undefined' && annotation !== true) {
return false
}
if (this.previous().length) {
return this.previous().some(i => i.inline)
}
return true
}
isMap() {
if (typeof this.opts.map !== 'undefined') {
return !!this.opts.map
}
return this.previous().length > 0
}
isSourcesContent() {
if (typeof this.mapOpts.sourcesContent !== 'undefined') {
return this.mapOpts.sourcesContent
}
if (this.previous().length) {
return this.previous().some(i => i.withContent())
}
return true
}
outputFile() {
if (this.opts.to) {
return this.path(this.opts.to)
} else if (this.opts.from) {
return this.path(this.opts.from)
} else {
return 'to.css'
}
}
path(file) {
if (this.mapOpts.absolute) return file
if (file.charCodeAt(0) === 60 /* `<` */) return file
if (/^\w+:\/\//.test(file)) return file
let cached = this.memoizedPaths.get(file)
if (cached) return cached
let from = this.opts.to ? dirname(this.opts.to) : '.'
if (typeof this.mapOpts.annotation === 'string') {
from = dirname(resolve(from, this.mapOpts.annotation))
}
let path = relative(from, file)
this.memoizedPaths.set(file, path)
return path
}
previous() {
if (!this.previousMaps) {
this.previousMaps = []
if (this.root) {
this.root.walk(node => {
if (node.source && node.source.input.map) {
let map = node.source.input.map
if (!this.previousMaps.includes(map)) {
this.previousMaps.push(map)
}
}
})
} else {
let input = new Input(this.originalCSS, this.opts)
if (input.map) this.previousMaps.push(input.map)
}
}
return this.previousMaps
}
setSourcesContent() {
let already = {}
if (this.root) {
this.root.walk(node => {
if (node.source) {
let from = node.source.input.from
if (from && !already[from]) {
already[from] = true
let fromUrl = this.usesFileUrls
? this.toFileUrl(from)
: this.toUrl(this.path(from))
this.map.setSourceContent(fromUrl, node.source.input.css)
}
}
})
} else if (this.css) {
let from = this.opts.from
? this.toUrl(this.path(this.opts.from))
: '<no source>'
this.map.setSourceContent(from, this.css)
}
}
sourcePath(node) {
if (this.mapOpts.from) {
return this.toUrl(this.mapOpts.from)
} else if (this.usesFileUrls) {
return this.toFileUrl(node.source.input.from)
} else {
return this.toUrl(this.path(node.source.input.from))
}
}
toBase64(str) {
if (Buffer) {
return Buffer.from(str).toString('base64')
} else {
return window.btoa(unescape(encodeURIComponent(str)))
}
}
toFileUrl(path) {
let cached = this.memoizedFileURLs.get(path)
if (cached) return cached
if (pathToFileURL) {
let fileURL = pathToFileURL(path).toString()
this.memoizedFileURLs.set(path, fileURL)
return fileURL
} else {
throw new Error(
'`map.absolute` option is not available in this PostCSS build'
)
}
}
toUrl(path) {
let cached = this.memoizedURLs.get(path)
if (cached) return cached
if (sep === '\\') {
path = path.replace(/\\/g, '/')
}
let url = encodeURI(path).replace(/[#?]/g, encodeURIComponent)
this.memoizedURLs.set(path, url)
return url
}
}
module.exports = MapGenerator
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