550 lines
13 KiB
JavaScript
550 lines
13 KiB
JavaScript
'use strict'
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let { isClean, my } = require('./symbols')
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let MapGenerator = require('./map-generator')
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let stringify = require('./stringify')
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let Container = require('./container')
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let Document = require('./document')
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let warnOnce = require('./warn-once')
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let Result = require('./result')
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let parse = require('./parse')
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let Root = require('./root')
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const TYPE_TO_CLASS_NAME = {
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atrule: 'AtRule',
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comment: 'Comment',
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decl: 'Declaration',
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document: 'Document',
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root: 'Root',
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rule: 'Rule'
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}
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const PLUGIN_PROPS = {
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AtRule: true,
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AtRuleExit: true,
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Comment: true,
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CommentExit: true,
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Declaration: true,
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DeclarationExit: true,
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Document: true,
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DocumentExit: true,
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Once: true,
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OnceExit: true,
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postcssPlugin: true,
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prepare: true,
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Root: true,
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RootExit: true,
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Rule: true,
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RuleExit: true
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}
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const NOT_VISITORS = {
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Once: true,
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postcssPlugin: true,
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prepare: true
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}
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const CHILDREN = 0
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function isPromise(obj) {
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return typeof obj === 'object' && typeof obj.then === 'function'
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}
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function getEvents(node) {
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let key = false
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let type = TYPE_TO_CLASS_NAME[node.type]
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if (node.type === 'decl') {
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key = node.prop.toLowerCase()
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} else if (node.type === 'atrule') {
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key = node.name.toLowerCase()
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}
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if (key && node.append) {
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return [
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type,
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type + '-' + key,
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CHILDREN,
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type + 'Exit',
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type + 'Exit-' + key
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]
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} else if (key) {
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return [type, type + '-' + key, type + 'Exit', type + 'Exit-' + key]
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} else if (node.append) {
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return [type, CHILDREN, type + 'Exit']
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} else {
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return [type, type + 'Exit']
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}
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}
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function toStack(node) {
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let events
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if (node.type === 'document') {
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events = ['Document', CHILDREN, 'DocumentExit']
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} else if (node.type === 'root') {
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events = ['Root', CHILDREN, 'RootExit']
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} else {
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events = getEvents(node)
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}
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return {
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eventIndex: 0,
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events,
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iterator: 0,
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node,
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visitorIndex: 0,
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visitors: []
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}
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}
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function cleanMarks(node) {
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node[isClean] = false
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if (node.nodes) node.nodes.forEach(i => cleanMarks(i))
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return node
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}
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let postcss = {}
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class LazyResult {
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constructor(processor, css, opts) {
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this.stringified = false
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this.processed = false
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let root
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if (
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typeof css === 'object' &&
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css !== null &&
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(css.type === 'root' || css.type === 'document')
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) {
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root = cleanMarks(css)
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} else if (css instanceof LazyResult || css instanceof Result) {
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root = cleanMarks(css.root)
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if (css.map) {
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if (typeof opts.map === 'undefined') opts.map = {}
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if (!opts.map.inline) opts.map.inline = false
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opts.map.prev = css.map
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}
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} else {
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let parser = parse
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if (opts.syntax) parser = opts.syntax.parse
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if (opts.parser) parser = opts.parser
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if (parser.parse) parser = parser.parse
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try {
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root = parser(css, opts)
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} catch (error) {
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this.processed = true
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this.error = error
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}
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if (root && !root[my]) {
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/* c8 ignore next 2 */
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Container.rebuild(root)
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}
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}
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this.result = new Result(processor, root, opts)
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this.helpers = { ...postcss, postcss, result: this.result }
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this.plugins = this.processor.plugins.map(plugin => {
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if (typeof plugin === 'object' && plugin.prepare) {
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return { ...plugin, ...plugin.prepare(this.result) }
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} else {
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return plugin
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}
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})
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}
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async() {
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if (this.error) return Promise.reject(this.error)
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if (this.processed) return Promise.resolve(this.result)
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if (!this.processing) {
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this.processing = this.runAsync()
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}
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return this.processing
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}
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catch(onRejected) {
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return this.async().catch(onRejected)
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}
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get content() {
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return this.stringify().content
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}
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get css() {
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return this.stringify().css
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}
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finally(onFinally) {
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return this.async().then(onFinally, onFinally)
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}
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getAsyncError() {
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throw new Error('Use process(css).then(cb) to work with async plugins')
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}
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handleError(error, node) {
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let plugin = this.result.lastPlugin
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try {
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if (node) node.addToError(error)
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this.error = error
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if (error.name === 'CssSyntaxError' && !error.plugin) {
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error.plugin = plugin.postcssPlugin
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error.setMessage()
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} else if (plugin.postcssVersion) {
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if (process.env.NODE_ENV !== 'production') {
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let pluginName = plugin.postcssPlugin
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let pluginVer = plugin.postcssVersion
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let runtimeVer = this.result.processor.version
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let a = pluginVer.split('.')
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let b = runtimeVer.split('.')
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if (a[0] !== b[0] || parseInt(a[1]) > parseInt(b[1])) {
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// eslint-disable-next-line no-console
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console.error(
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'Unknown error from PostCSS plugin. Your current PostCSS ' +
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'version is ' +
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runtimeVer +
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', but ' +
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pluginName +
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' uses ' +
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pluginVer +
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'. Perhaps this is the source of the error below.'
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)
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}
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}
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}
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} catch (err) {
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/* c8 ignore next 3 */
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// eslint-disable-next-line no-console
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if (console && console.error) console.error(err)
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}
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return error
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}
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get map() {
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return this.stringify().map
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}
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get messages() {
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return this.sync().messages
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}
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get opts() {
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return this.result.opts
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}
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prepareVisitors() {
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this.listeners = {}
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let add = (plugin, type, cb) => {
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if (!this.listeners[type]) this.listeners[type] = []
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this.listeners[type].push([plugin, cb])
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}
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for (let plugin of this.plugins) {
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if (typeof plugin === 'object') {
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for (let event in plugin) {
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if (!PLUGIN_PROPS[event] && /^[A-Z]/.test(event)) {
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throw new Error(
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`Unknown event ${event} in ${plugin.postcssPlugin}. ` +
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`Try to update PostCSS (${this.processor.version} now).`
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)
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}
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if (!NOT_VISITORS[event]) {
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if (typeof plugin[event] === 'object') {
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for (let filter in plugin[event]) {
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if (filter === '*') {
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add(plugin, event, plugin[event][filter])
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} else {
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add(
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plugin,
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event + '-' + filter.toLowerCase(),
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plugin[event][filter]
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)
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}
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}
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} else if (typeof plugin[event] === 'function') {
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add(plugin, event, plugin[event])
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}
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}
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}
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}
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}
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this.hasListener = Object.keys(this.listeners).length > 0
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}
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get processor() {
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return this.result.processor
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}
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get root() {
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return this.sync().root
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}
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async runAsync() {
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this.plugin = 0
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for (let i = 0; i < this.plugins.length; i++) {
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let plugin = this.plugins[i]
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let promise = this.runOnRoot(plugin)
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if (isPromise(promise)) {
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try {
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await promise
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} catch (error) {
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throw this.handleError(error)
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}
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}
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}
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this.prepareVisitors()
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if (this.hasListener) {
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let root = this.result.root
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while (!root[isClean]) {
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root[isClean] = true
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let stack = [toStack(root)]
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while (stack.length > 0) {
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let promise = this.visitTick(stack)
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if (isPromise(promise)) {
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try {
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await promise
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} catch (e) {
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let node = stack[stack.length - 1].node
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throw this.handleError(e, node)
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}
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}
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}
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}
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if (this.listeners.OnceExit) {
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for (let [plugin, visitor] of this.listeners.OnceExit) {
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this.result.lastPlugin = plugin
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try {
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if (root.type === 'document') {
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let roots = root.nodes.map(subRoot =>
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visitor(subRoot, this.helpers)
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)
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await Promise.all(roots)
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} else {
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await visitor(root, this.helpers)
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}
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} catch (e) {
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throw this.handleError(e)
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}
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}
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}
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}
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this.processed = true
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return this.stringify()
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}
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runOnRoot(plugin) {
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this.result.lastPlugin = plugin
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try {
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if (typeof plugin === 'object' && plugin.Once) {
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if (this.result.root.type === 'document') {
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let roots = this.result.root.nodes.map(root =>
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plugin.Once(root, this.helpers)
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)
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if (isPromise(roots[0])) {
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return Promise.all(roots)
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}
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return roots
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}
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return plugin.Once(this.result.root, this.helpers)
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} else if (typeof plugin === 'function') {
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return plugin(this.result.root, this.result)
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}
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} catch (error) {
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throw this.handleError(error)
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}
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}
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stringify() {
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if (this.error) throw this.error
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if (this.stringified) return this.result
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this.stringified = true
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this.sync()
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let opts = this.result.opts
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let str = stringify
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if (opts.syntax) str = opts.syntax.stringify
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if (opts.stringifier) str = opts.stringifier
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if (str.stringify) str = str.stringify
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let map = new MapGenerator(str, this.result.root, this.result.opts)
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let data = map.generate()
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this.result.css = data[0]
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this.result.map = data[1]
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return this.result
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}
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get [Symbol.toStringTag]() {
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return 'LazyResult'
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}
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sync() {
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if (this.error) throw this.error
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if (this.processed) return this.result
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this.processed = true
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if (this.processing) {
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throw this.getAsyncError()
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}
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for (let plugin of this.plugins) {
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let promise = this.runOnRoot(plugin)
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if (isPromise(promise)) {
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throw this.getAsyncError()
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}
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}
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this.prepareVisitors()
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if (this.hasListener) {
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let root = this.result.root
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while (!root[isClean]) {
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root[isClean] = true
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this.walkSync(root)
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}
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if (this.listeners.OnceExit) {
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if (root.type === 'document') {
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for (let subRoot of root.nodes) {
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this.visitSync(this.listeners.OnceExit, subRoot)
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}
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} else {
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this.visitSync(this.listeners.OnceExit, root)
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}
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}
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}
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return this.result
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}
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then(onFulfilled, onRejected) {
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if (process.env.NODE_ENV !== 'production') {
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if (!('from' in this.opts)) {
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warnOnce(
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'Without `from` option PostCSS could generate wrong source map ' +
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'and will not find Browserslist config. Set it to CSS file path ' +
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'or to `undefined` to prevent this warning.'
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)
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}
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}
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return this.async().then(onFulfilled, onRejected)
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}
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toString() {
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return this.css
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}
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visitSync(visitors, node) {
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for (let [plugin, visitor] of visitors) {
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this.result.lastPlugin = plugin
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let promise
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try {
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promise = visitor(node, this.helpers)
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} catch (e) {
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throw this.handleError(e, node.proxyOf)
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}
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if (node.type !== 'root' && node.type !== 'document' && !node.parent) {
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return true
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}
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if (isPromise(promise)) {
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throw this.getAsyncError()
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}
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}
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}
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visitTick(stack) {
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let visit = stack[stack.length - 1]
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let { node, visitors } = visit
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if (node.type !== 'root' && node.type !== 'document' && !node.parent) {
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stack.pop()
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return
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}
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if (visitors.length > 0 && visit.visitorIndex < visitors.length) {
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let [plugin, visitor] = visitors[visit.visitorIndex]
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visit.visitorIndex += 1
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if (visit.visitorIndex === visitors.length) {
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visit.visitors = []
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visit.visitorIndex = 0
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}
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this.result.lastPlugin = plugin
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try {
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return visitor(node.toProxy(), this.helpers)
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} catch (e) {
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throw this.handleError(e, node)
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}
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}
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if (visit.iterator !== 0) {
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let iterator = visit.iterator
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let child
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while ((child = node.nodes[node.indexes[iterator]])) {
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node.indexes[iterator] += 1
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if (!child[isClean]) {
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child[isClean] = true
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stack.push(toStack(child))
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return
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}
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}
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visit.iterator = 0
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delete node.indexes[iterator]
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}
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let events = visit.events
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while (visit.eventIndex < events.length) {
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let event = events[visit.eventIndex]
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visit.eventIndex += 1
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if (event === CHILDREN) {
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if (node.nodes && node.nodes.length) {
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node[isClean] = true
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visit.iterator = node.getIterator()
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}
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return
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} else if (this.listeners[event]) {
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visit.visitors = this.listeners[event]
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return
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}
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}
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stack.pop()
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}
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walkSync(node) {
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node[isClean] = true
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let events = getEvents(node)
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for (let event of events) {
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if (event === CHILDREN) {
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if (node.nodes) {
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node.each(child => {
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if (!child[isClean]) this.walkSync(child)
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})
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}
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} else {
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let visitors = this.listeners[event]
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if (visitors) {
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if (this.visitSync(visitors, node.toProxy())) return
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}
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}
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}
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}
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warnings() {
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return this.sync().warnings()
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}
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}
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LazyResult.registerPostcss = dependant => {
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postcss = dependant
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}
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module.exports = LazyResult
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LazyResult.default = LazyResult
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Root.registerLazyResult(LazyResult)
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Document.registerLazyResult(LazyResult)
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