const postcss = require('postcss')
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import { ProcessOptions, LazyResult } from 'postcss'
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import trimPlugin from './stylePlugins/trim'
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import scopedPlugin from './stylePlugins/scoped'
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import {
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processors,
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StylePreprocessor,
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StylePreprocessorResults
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} from './styleProcessors'
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export interface StyleCompileOptions {
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source: string
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filename: string
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id: string
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map?: any
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scoped?: boolean
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trim?: boolean
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preprocessLang?: string
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preprocessOptions?: any
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postcssOptions?: any
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postcssPlugins?: any[]
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}
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export interface AsyncStyleCompileOptions extends StyleCompileOptions {
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isAsync?: boolean
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}
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export interface StyleCompileResults {
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code: string
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map: any | void
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rawResult: LazyResult | void
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errors: string[]
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}
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export function compileStyle(
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options: StyleCompileOptions
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): StyleCompileResults {
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return doCompileStyle({ ...options, isAsync: false })
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}
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export function compileStyleAsync(
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options: StyleCompileOptions
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): Promise<StyleCompileResults> {
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return Promise.resolve(doCompileStyle({ ...options, isAsync: true }))
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}
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export function doCompileStyle(
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options: AsyncStyleCompileOptions
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): StyleCompileResults {
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const {
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filename,
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id,
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scoped = true,
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trim = true,
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preprocessLang,
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postcssOptions,
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postcssPlugins
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} = options
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const preprocessor = preprocessLang && processors[preprocessLang]
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const preProcessedSource = preprocessor && preprocess(options, preprocessor)
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const map = preProcessedSource ? preProcessedSource.map : options.map
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const source = preProcessedSource ? preProcessedSource.code : options.source
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const plugins = (postcssPlugins || []).slice()
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if (trim) {
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plugins.push(trimPlugin())
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}
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if (scoped) {
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plugins.push(scopedPlugin(id))
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}
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const postCSSOptions: ProcessOptions = {
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...postcssOptions,
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to: filename,
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from: filename
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}
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if (map) {
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postCSSOptions.map = {
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inline: false,
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annotation: false,
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prev: map
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}
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}
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let result, code, outMap
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const errors: any[] = []
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if (preProcessedSource && preProcessedSource.errors.length) {
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errors.push(...preProcessedSource.errors)
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}
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try {
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result = postcss(plugins).process(source, postCSSOptions)
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// In async mode, return a promise.
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if (options.isAsync) {
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return result
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.then(
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(result: LazyResult): StyleCompileResults => ({
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code: result.css || '',
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map: result.map && result.map.toJSON(),
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errors,
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rawResult: result
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})
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)
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.catch(
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(error: Error): StyleCompileResults => ({
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code: '',
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map: undefined,
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errors: [...errors, error.message],
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rawResult: undefined
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})
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)
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}
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// force synchronous transform (we know we only have sync plugins)
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code = result.css
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outMap = result.map
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} catch (e) {
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errors.push(e)
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}
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return {
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code: code || ``,
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map: outMap && outMap.toJSON(),
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errors,
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rawResult: result
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}
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}
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function preprocess(
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options: StyleCompileOptions,
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preprocessor: StylePreprocessor
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): StylePreprocessorResults {
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return preprocessor.render(
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options.source,
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options.map,
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Object.assign(
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{
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filename: options.filename
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},
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options.preprocessOptions
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)
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)
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}
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