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preprocessor.js
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preprocessor.js
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'use strict'
const fs = require('graceful-fs')
const mm = require('minimatch')
const isBinaryFile = require('isbinaryfile')
const _ = require('lodash')
const CryptoUtils = require('./utils/crypto-utils')
const log = require('./logger').create('preprocess')
function executeProcessor (process, file, content) {
let done = null
const donePromise = new Promise((resolve, reject) => {
done = function (error, content) {
// normalize B-C
if (arguments.length === 1 && typeof error === 'string') {
content = error
error = null
}
if (error) {
reject(error)
} else {
resolve(content)
}
}
})
return (process(content, file, done) || Promise.resolve()).then((content) => {
if (content) {
// async process correctly returned content
return content
}
// process called done() (Either old sync api or an async function that did not return content)
return donePromise
})
}
async function runProcessors (preprocessors, file, content) {
try {
for (let process of preprocessors) {
content = await executeProcessor(process, file, content)
}
} catch (error) {
file.contentPath = null
file.content = null
throw error
}
file.contentPath = null
file.content = content
file.sha = CryptoUtils.sha1(content)
}
function createPriorityPreprocessor (config, preprocessorPriority, basePath, injector) {
const emitter = injector.get('emitter')
const alreadyDisplayedErrors = {}
const instances = {}
let patterns = Object.keys(config)
function instantiatePreprocessor (name) {
if (alreadyDisplayedErrors[name]) {
return
}
let p = instances[name]
if (p) {
return p
}
try {
p = injector.get('preprocessor:' + name)
} catch (e) {
if (e.message.includes(`No provider for "preprocessor:${name}"`)) {
log.error(`Can not load "${name}", it is not registered!\n Perhaps you are missing some plugin?`)
} else {
log.error(`Can not load "${name}"!\n ` + e.stack)
}
alreadyDisplayedErrors[name] = true
emitter.emit('load_error', 'preprocessor', name)
}
if (!p && !alreadyDisplayedErrors[name]) {
alreadyDisplayedErrors[name] = true
log.error(`Failed to instantiate preprocessor ${name}`)
emitter.emit('load_error', 'preprocessor', name)
} else {
instances[name] = p
}
return p
}
let allPreprocessors = []
patterns.forEach((pattern) => {
allPreprocessors = _.union(allPreprocessors, config[pattern])
})
allPreprocessors.forEach(instantiatePreprocessor)
return function preprocess (file, done) {
patterns = Object.keys(config)
let retryCount = 0
let maxRetries = 3
function readFileCallback (err, buffer) {
if (err) {
log.warn(err)
if (retryCount < maxRetries) {
retryCount++
log.warn('retrying ' + retryCount)
fs.readFile(file.originalPath, readFileCallback)
return
} else {
throw err
}
}
isBinaryFile(buffer, buffer.length, function (err, isBinary) {
if (err) {
throw err
}
let preprocessorNames = []
patterns.forEach((pattern) => {
if (mm(file.originalPath, pattern, { dot: true })) {
preprocessorNames = _.union(preprocessorNames, config[pattern])
}
})
// Apply preprocessor priority.
const preprocessors = preprocessorNames
.map((name) => [name, preprocessorPriority[name] || 0])
.sort((a, b) => b[1] - a[1])
.map((duo) => duo[0])
.reduce((res, name) => {
const p = instantiatePreprocessor(name)
if (!isBinary || (p && p.handleBinaryFiles)) {
res.push(p)
} else {
log.warn(`Ignored preprocessing ${file.originalPath} because ${name} has handleBinaryFiles=false.`)
}
return res
}, [])
runProcessors(preprocessors, file, isBinary ? buffer : buffer.toString()).then(done, done)
})
}
return fs.readFile(file.originalPath, readFileCallback)
}
}
// Deprecated API
function createPreprocessor (preprocessors, basePath, injector) {
console.log('Deprecated private createPreprocessor() API')
const preprocessorPriority = injector.get('config.preprocessor_priority')
return createPriorityPreprocessor(preprocessors, preprocessorPriority, basePath, injector)
}
createPreprocessor.$inject = ['config.preprocessors', 'config.basePath', 'injector']
exports.createPreprocessor = createPreprocessor
createPriorityPreprocessor.$inject = ['config.preprocessors', 'config.preprocessor_priority', 'config.basePath', 'injector']
exports.createPriorityPreprocessor = createPriorityPreprocessor