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lazy-result.js
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Mon, Feb 10, 18:29

lazy-result.js
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'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 = {
document: 'Document',
root: 'Root',
atrule: 'AtRule',
rule: 'Rule',
decl: 'Declaration',
comment: 'Comment'
}
const PLUGIN_PROPS = {
postcssPlugin: true,
prepare: true,
Once: true,
Document: true,
Root: true,
Declaration: true,
Rule: true,
AtRule: true,
Comment: true,
DeclarationExit: true,
RuleExit: true,
AtRuleExit: true,
CommentExit: true,
RootExit: true,
DocumentExit: true,
OnceExit: true
}
const NOT_VISITORS = {
postcssPlugin: true,
prepare: true,
Once: 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 {
node,
events,
eventIndex: 0,
visitors: [],
visitorIndex: 0,
iterator: 0
}
}
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, result: this.result, postcss }
this.plugins = this.processor.plugins.map(plugin => {
if (typeof plugin === 'object' && plugin.prepare) {
return { ...plugin, ...plugin.prepare(this.result) }
} else {
return plugin
}
})
}
get [Symbol.toStringTag]() {
return 'LazyResult'
}
get processor() {
return this.result.processor
}
get opts() {
return this.result.opts
}
get css() {
return this.stringify().css
}
get content() {
return this.stringify().content
}
get map() {
return this.stringify().map
}
get root() {
return this.sync().root
}
get messages() {
return this.sync().messages
}
warnings() {
return this.sync().warnings()
}
toString() {
return this.css
}
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)
}
catch(onRejected) {
return this.async().catch(onRejected)
}
finally(onFinally) {
return this.async().then(onFinally, onFinally)
}
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
}
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
}
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
}
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
}
}
}
}
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()
}
}
}
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)
}
}
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
}
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()
}
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
}
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()
}
}
LazyResult.registerPostcss = dependant => {
postcss = dependant
}
module.exports = LazyResult
LazyResult.default = LazyResult
Root.registerLazyResult(LazyResult)
Document.registerLazyResult(LazyResult)

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