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