diff options
Diffstat (limited to 'node_modules/postcss/lib/lazy-result.js')
| -rw-r--r-- | node_modules/postcss/lib/lazy-result.js | 550 |
1 files changed, 550 insertions, 0 deletions
diff --git a/node_modules/postcss/lib/lazy-result.js b/node_modules/postcss/lib/lazy-result.js new file mode 100644 index 0000000..126f40c --- /dev/null +++ b/node_modules/postcss/lib/lazy-result.js @@ -0,0 +1,550 @@ +'use strict' + +let { isClean, my } = require('./symbols') +let MapGenerator = require('./map-generator') +let stringify = require('./stringify') +let Container = require('./container') +let Document = require('./document') +let warnOnce = require('./warn-once') +let Result = require('./result') +let parse = require('./parse') +let Root = require('./root') + +const TYPE_TO_CLASS_NAME = { + atrule: 'AtRule', + comment: 'Comment', + decl: 'Declaration', + document: 'Document', + root: 'Root', + rule: 'Rule' +} + +const PLUGIN_PROPS = { + AtRule: true, + AtRuleExit: true, + Comment: true, + CommentExit: true, + Declaration: true, + DeclarationExit: true, + Document: true, + DocumentExit: true, + Once: true, + OnceExit: true, + postcssPlugin: true, + prepare: true, + Root: true, + RootExit: true, + Rule: true, + RuleExit: true +} + +const NOT_VISITORS = { + Once: true, + postcssPlugin: true, + prepare: true +} + +const CHILDREN = 0 + +function isPromise(obj) { + return typeof obj === 'object' && typeof obj.then === 'function' +} + +function getEvents(node) { + let key = false + let type = TYPE_TO_CLASS_NAME[node.type] + if (node.type === 'decl') { + key = node.prop.toLowerCase() + } else if (node.type === 'atrule') { + key = node.name.toLowerCase() + } + + if (key && node.append) { + return [ + type, + type + '-' + key, + CHILDREN, + type + 'Exit', + type + 'Exit-' + key + ] + } else if (key) { + return [type, type + '-' + key, type + 'Exit', type + 'Exit-' + key] + } else if (node.append) { + return [type, CHILDREN, type + 'Exit'] + } else { + return [type, type + 'Exit'] + } +} + +function toStack(node) { + let events + if (node.type === 'document') { + events = ['Document', CHILDREN, 'DocumentExit'] + } else if (node.type === 'root') { + events = ['Root', CHILDREN, 'RootExit'] + } else { + events = getEvents(node) + } + + return { + eventIndex: 0, + events, + iterator: 0, + node, + visitorIndex: 0, + visitors: [] + } +} + +function cleanMarks(node) { + node[isClean] = false + if (node.nodes) node.nodes.forEach(i => cleanMarks(i)) + return node +} + +let postcss = {} + +class LazyResult { + constructor(processor, css, opts) { + this.stringified = false + this.processed = false + + let root + if ( + typeof css === 'object' && + css !== null && + (css.type === 'root' || css.type === 'document') + ) { + root = cleanMarks(css) + } else if (css instanceof LazyResult || css instanceof Result) { + root = cleanMarks(css.root) + if (css.map) { + if (typeof opts.map === 'undefined') opts.map = {} + if (!opts.map.inline) opts.map.inline = false + opts.map.prev = css.map + } + } else { + let parser = parse + if (opts.syntax) parser = opts.syntax.parse + if (opts.parser) parser = opts.parser + if (parser.parse) parser = parser.parse + + try { + root = parser(css, opts) + } catch (error) { + this.processed = true + this.error = error + } + + if (root && !root[my]) { + /* c8 ignore next 2 */ + Container.rebuild(root) + } + } + + this.result = new Result(processor, root, opts) + this.helpers = { ...postcss, postcss, result: this.result } + this.plugins = this.processor.plugins.map(plugin => { + if (typeof plugin === 'object' && plugin.prepare) { + return { ...plugin, ...plugin.prepare(this.result) } + } else { + return plugin + } + }) + } + + async() { + if (this.error) return Promise.reject(this.error) + if (this.processed) return Promise.resolve(this.result) + if (!this.processing) { + this.processing = this.runAsync() + } + return this.processing + } + + catch(onRejected) { + return this.async().catch(onRejected) + } + + finally(onFinally) { + return this.async().then(onFinally, onFinally) + } + + getAsyncError() { + throw new Error('Use process(css).then(cb) to work with async plugins') + } + + handleError(error, node) { + let plugin = this.result.lastPlugin + try { + if (node) node.addToError(error) + this.error = error + if (error.name === 'CssSyntaxError' && !error.plugin) { + error.plugin = plugin.postcssPlugin + error.setMessage() + } else if (plugin.postcssVersion) { + if (process.env.NODE_ENV !== 'production') { + let pluginName = plugin.postcssPlugin + let pluginVer = plugin.postcssVersion + let runtimeVer = this.result.processor.version + let a = pluginVer.split('.') + let b = runtimeVer.split('.') + + if (a[0] !== b[0] || parseInt(a[1]) > parseInt(b[1])) { + // eslint-disable-next-line no-console + console.error( + 'Unknown error from PostCSS plugin. Your current PostCSS ' + + 'version is ' + + runtimeVer + + ', but ' + + pluginName + + ' uses ' + + pluginVer + + '. Perhaps this is the source of the error below.' + ) + } + } + } + } catch (err) { + /* c8 ignore next 3 */ + // eslint-disable-next-line no-console + if (console && console.error) console.error(err) + } + return error + } + + prepareVisitors() { + this.listeners = {} + let add = (plugin, type, cb) => { + if (!this.listeners[type]) this.listeners[type] = [] + this.listeners[type].push([plugin, cb]) + } + for (let plugin of this.plugins) { + if (typeof plugin === 'object') { + for (let event in plugin) { + if (!PLUGIN_PROPS[event] && /^[A-Z]/.test(event)) { + throw new Error( + `Unknown event ${event} in ${plugin.postcssPlugin}. ` + + `Try to update PostCSS (${this.processor.version} now).` + ) + } + if (!NOT_VISITORS[event]) { + if (typeof plugin[event] === 'object') { + for (let filter in plugin[event]) { + if (filter === '*') { + add(plugin, event, plugin[event][filter]) + } else { + add( + plugin, + event + '-' + filter.toLowerCase(), + plugin[event][filter] + ) + } + } + } else if (typeof plugin[event] === 'function') { + add(plugin, event, plugin[event]) + } + } + } + } + } + this.hasListener = Object.keys(this.listeners).length > 0 + } + + async runAsync() { + this.plugin = 0 + for (let i = 0; i < this.plugins.length; i++) { + let plugin = this.plugins[i] + let promise = this.runOnRoot(plugin) + if (isPromise(promise)) { + try { + await promise + } catch (error) { + throw this.handleError(error) + } + } + } + + this.prepareVisitors() + if (this.hasListener) { + let root = this.result.root + while (!root[isClean]) { + root[isClean] = true + let stack = [toStack(root)] + while (stack.length > 0) { + let promise = this.visitTick(stack) + if (isPromise(promise)) { + try { + await promise + } catch (e) { + let node = stack[stack.length - 1].node + throw this.handleError(e, node) + } + } + } + } + + if (this.listeners.OnceExit) { + for (let [plugin, visitor] of this.listeners.OnceExit) { + this.result.lastPlugin = plugin + try { + if (root.type === 'document') { + let roots = root.nodes.map(subRoot => + visitor(subRoot, this.helpers) + ) + + await Promise.all(roots) + } else { + await visitor(root, this.helpers) + } + } catch (e) { + throw this.handleError(e) + } + } + } + } + + this.processed = true + return this.stringify() + } + + runOnRoot(plugin) { + this.result.lastPlugin = plugin + try { + if (typeof plugin === 'object' && plugin.Once) { + if (this.result.root.type === 'document') { + let roots = this.result.root.nodes.map(root => + plugin.Once(root, this.helpers) + ) + + if (isPromise(roots[0])) { + return Promise.all(roots) + } + + return roots + } + + return plugin.Once(this.result.root, this.helpers) + } else if (typeof plugin === 'function') { + return plugin(this.result.root, this.result) + } + } catch (error) { + throw this.handleError(error) + } + } + + stringify() { + if (this.error) throw this.error + if (this.stringified) return this.result + this.stringified = true + + this.sync() + + let opts = this.result.opts + let str = stringify + if (opts.syntax) str = opts.syntax.stringify + if (opts.stringifier) str = opts.stringifier + if (str.stringify) str = str.stringify + + let map = new MapGenerator(str, this.result.root, this.result.opts) + let data = map.generate() + this.result.css = data[0] + this.result.map = data[1] + + return this.result + } + + sync() { + if (this.error) throw this.error + if (this.processed) return this.result + this.processed = true + + if (this.processing) { + throw this.getAsyncError() + } + + for (let plugin of this.plugins) { + let promise = this.runOnRoot(plugin) + if (isPromise(promise)) { + throw this.getAsyncError() + } + } + + this.prepareVisitors() + if (this.hasListener) { + let root = this.result.root + while (!root[isClean]) { + root[isClean] = true + this.walkSync(root) + } + if (this.listeners.OnceExit) { + if (root.type === 'document') { + for (let subRoot of root.nodes) { + this.visitSync(this.listeners.OnceExit, subRoot) + } + } else { + this.visitSync(this.listeners.OnceExit, root) + } + } + } + + return this.result + } + + then(onFulfilled, onRejected) { + if (process.env.NODE_ENV !== 'production') { + if (!('from' in this.opts)) { + warnOnce( + 'Without `from` option PostCSS could generate wrong source map ' + + 'and will not find Browserslist config. Set it to CSS file path ' + + 'or to `undefined` to prevent this warning.' + ) + } + } + return this.async().then(onFulfilled, onRejected) + } + + toString() { + return this.css + } + + visitSync(visitors, node) { + for (let [plugin, visitor] of visitors) { + this.result.lastPlugin = plugin + let promise + try { + promise = visitor(node, this.helpers) + } catch (e) { + throw this.handleError(e, node.proxyOf) + } + if (node.type !== 'root' && node.type !== 'document' && !node.parent) { + return true + } + if (isPromise(promise)) { + throw this.getAsyncError() + } + } + } + + visitTick(stack) { + let visit = stack[stack.length - 1] + let { node, visitors } = visit + + if (node.type !== 'root' && node.type !== 'document' && !node.parent) { + stack.pop() + return + } + + if (visitors.length > 0 && visit.visitorIndex < visitors.length) { + let [plugin, visitor] = visitors[visit.visitorIndex] + visit.visitorIndex += 1 + if (visit.visitorIndex === visitors.length) { + visit.visitors = [] + visit.visitorIndex = 0 + } + this.result.lastPlugin = plugin + try { + return visitor(node.toProxy(), this.helpers) + } catch (e) { + throw this.handleError(e, node) + } + } + + if (visit.iterator !== 0) { + let iterator = visit.iterator + let child + while ((child = node.nodes[node.indexes[iterator]])) { + node.indexes[iterator] += 1 + if (!child[isClean]) { + child[isClean] = true + stack.push(toStack(child)) + return + } + } + visit.iterator = 0 + delete node.indexes[iterator] + } + + let events = visit.events + while (visit.eventIndex < events.length) { + let event = events[visit.eventIndex] + visit.eventIndex += 1 + if (event === CHILDREN) { + if (node.nodes && node.nodes.length) { + node[isClean] = true + visit.iterator = node.getIterator() + } + return + } else if (this.listeners[event]) { + visit.visitors = this.listeners[event] + return + } + } + stack.pop() + } + + walkSync(node) { + node[isClean] = true + let events = getEvents(node) + for (let event of events) { + if (event === CHILDREN) { + if (node.nodes) { + node.each(child => { + if (!child[isClean]) this.walkSync(child) + }) + } + } else { + let visitors = this.listeners[event] + if (visitors) { + if (this.visitSync(visitors, node.toProxy())) return + } + } + } + } + + warnings() { + return this.sync().warnings() + } + + get content() { + return this.stringify().content + } + + get css() { + return this.stringify().css + } + + get map() { + return this.stringify().map + } + + get messages() { + return this.sync().messages + } + + get opts() { + return this.result.opts + } + + get processor() { + return this.result.processor + } + + get root() { + return this.sync().root + } + + get [Symbol.toStringTag]() { + return 'LazyResult' + } +} + +LazyResult.registerPostcss = dependant => { + postcss = dependant +} + +module.exports = LazyResult +LazyResult.default = LazyResult + +Root.registerLazyResult(LazyResult) +Document.registerLazyResult(LazyResult) |