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transform.ts
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transform.ts
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import * as autoprefixer from 'autoprefixer'
import * as deasync from 'deasync'
import * as md5 from 'md5-file'
import * as sass from 'node-sass'
import * as path from 'path'
import * as postcss from 'postcss'
import * as csso from 'postcss-csso'
import * as ts from 'typescript'
const cssProcessor = postcss([autoprefixer, csso])
const inlineRegex = /:inline[\n\r\s]*\{[\n\r\s]*content:[\n\r\s]*("([^"]|\\")*"|'([^']|\\')*');[\n\r\s]*\}/g
const inlineRegexCap = /content:[\n\r\s]*("([^"]|\\")*"|'([^']|\\')*');/
function fsp(file, outFile) {
return new Promise((res, rej) => sass.render({
file,
outFile,
// sourceMap: true
}, (err2, result) => {
if (err2)
return rej(err2)
res({
css: result.css.toString('utf8'),
// map: result.map.toString('utf8')
})
}))
.then(({
css,
// map
}) => cssProcessor.process(css, {
from: file,
/*map: {
prev: map,
inline: true
}*/
}))
.then(res => res.css)
}
function dea<T>(promise: Promise<T>) {
return deasync((cb: (err, res: T) => void) => {
promise
.then(r => cb(null, r))
.catch(e => cb(e, null))
})()
}
const hashes: { [file: string]: string } = {}
const cache: { [file: string]: Promise<{ [key: string]: string }> } = {}
export default function (_program: ts.Program, _config: any) {
return (ctx: ts.TransformationContext) => {
return (sourceFile: ts.SourceFile) => {
const dir = path.dirname(sourceFile.fileName)
function visitor(node: ts.Node) {
if ('text' in node && node['text'].match(inlineRegex)) {
const matches = node['text'].match(inlineRegex) || []
const resolved = {}
matches
.map(match => {
const m = match.match(inlineRegexCap)
if (!m)
return {
match,
path: ''
}
let p = m[1].trim()
// Remove quotes
p = p.replace(new RegExp(`\\\\${m[1].charAt(0)}`, 'g'), m[1].charAt(0))
p = path.normalize(p.substr(1, p.length - 2))
if (!path.isAbsolute(p))
p = path.normalize(path.join(dir, p))
return {
match,
p
}
})
.forEach(({ match, p }) => {
if (!(p in resolved))
resolved[p] = []
resolved[p].push(match)
})
const promise = Promise.all(
Object.keys(resolved)
.map(file => {
const hash = md5.sync(file)
if (file in cache) {
if (!(file in hashes) || hashes[file] != hash)
delete cache[file]
}
hashes[file] = hash
if (!(file in cache) || !cache[file])
cache[file] = fsp(file, sourceFile.fileName)
.catch(_err => '')
.then(css => ({ [file]: css }))
return cache[file]
})
)
.then(values => Object.assign({}, ...values))
.catch(() => ({ '': '' }))
const result: { [file: string]: string } = dea(promise)
const replacements: { [match: string]: string } = {}
Object.keys(result)
.forEach(file =>
resolved[file].forEach(match =>
replacements[match] = result[file]
)
)
const node2 = ts.createNode(node['kind'])
node2.parent = node['parent']
node2['text'] = node['text'].replace(inlineRegex, match => replacements[match] || '')
return node2
}
return ts.visitEachChild(node, visitor, ctx)
}
return ts.visitEachChild(sourceFile, visitor, ctx)
}
}
}