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bundler.js
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bundler.js
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const fs = require('fs')
const path = require('path')
const resolve = require('resolve')
const beautify = require('js-beautify').js_beautify
const ENCODING = 'utf-8'
function REQUIRE_REGEX() {
return new RegExp(/\/\/+\s*REQUIRE\s+([^\s\n]+)/, "gi")
}
function INCLUDE_REGEX() {
return new RegExp(/\/\/+\s*INCLUDE\s+([^\s\n]+)/, "gi")
}
function INCLUDEB_REGEX() {
return new RegExp(/\/\/+\s*INCLUDE_?B\s+([^\s\n]+)/, "gi")
}
function concatFiles(files) {
let concatenated = ''
for (let file of files) {
concatenated += file.getFinalContent()
concatenated += '\n\n'
}
return concatenated
}
class File {
constructor(filepath, basedir = process.cwd()) {
this.absolutefilepath = File.resolve(filepath, basedir)
this.dependentfiles = []
this._generated = false
this.tempmark = false
this.permmark = false
this._contentwithincludes = null
}
readFile() {
return fs.readFileSync(this.absolutefilepath, 'utf-8')
}
getContentWithIncludes(existingfiles = [], ancestorincludes = []) {
if (this._contentwithincludes != null) {
return this._contentwithincludes
}
// Check for cyclical inclusions
ancestorincludes.forEach((file) => {
if (this.absolutefilepath == file.absolutefilepath) {
throw new Error('Ran into cyclical inclusion! Cannot INCLUDE file within itself: ' + this.absolutefilepath)
}
})
this._contentwithincludes = this.readFile();
// Return contents with INCLUDE statements replaced with the inclusions
this._contentwithincludes = this._contentwithincludes.replace(INCLUDE_REGEX(), (m, p) => {
let includedfile = this.getRelativeFile(p, existingfiles)
return includedfile.getContentWithIncludes(existingfiles, ancestorincludes.concat([this]))
})
this._contentwithincludes = this._contentwithincludes.replace(INCLUDEB_REGEX(), (m, p) => {
let includedfile = this.getRelativeFile(p)
return bundle(includedfile.absolutefilepath, { disablebeautify: true })
})
return this._contentwithincludes
}
getFinalContent() {
if (this._contentwithincludes == null) {
throw new Error('An unknown error occured (_contentwithincludes was null)')
}
return this._contentwithincludes.replace(REQUIRE_REGEX(), () => '')
}
addDependentFile(file) {
for (let dependentfile of this.dependentfiles) {
if (file.absolutefilepath == dependentfile.absolutefilepath) {
return
}
}
this.dependentfiles.push(file)
this._generated = false
}
generateDependentFiles(existingfiles = []) {
if (this._generated == true) {
return
}
this.dependentfiles = []
let regex = REQUIRE_REGEX()
let matches
while (matches = regex.exec(this.getContentWithIncludes(existingfiles))) {
this.addDependentFile(this.getRelativeFile(matches[1], existingfiles))
}
this._generated = true
}
getRelativeFile(filepath, existingfiles = []) {
let newfile = new File(filepath, this.dir())
for (let existingfile of existingfiles) {
if (newfile.absolutefilepath == existingfile.absolutefilepath) {
return existingfile
}
}
existingfiles.push(newfile)
return newfile
}
dir() {
return path.dirname(this.absolutefilepath)
}
static resolve(filepath, basedir = process.cwd()) {
return path.normalize(
path.resolve(
resolve.sync(filepath, { basedir })
)
)
}
}
function toposortDependencies(entryfilepath) {
let existingfiles = []
let sortedlist = []
function DFSToposort(root) {
if (root.permmark)
return
if (root.tempmark)
throw new Error('Found a dependency cycle')
root.tempmark = true
// Generate dependencies on-the-fly while doing DFS
root.generateDependentFiles(existingfiles)
root.dependentfiles.forEach((vertex) => DFSToposort(vertex))
root.permmark = true
sortedlist.push(root)
}
let root = new File(entryfilepath)
existingfiles.push(root)
DFSToposort(root)
return sortedlist
}
function bundle(entryfilepath, options = {}) {
let order = toposortDependencies(entryfilepath)
let bundled = concatFiles(order)
if (!(options.disablebeautify == true)) {
bundled = beautify(bundled, {
indent_size: 4,
end_with_newline: true,
preserve_newlines: false
})
}
return bundled
}
module.exports = { bundle: bundle }