87 lines
3.1 KiB
JavaScript
87 lines
3.1 KiB
JavaScript
"use strict"
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var fs = require("fs")
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var path = require("path")
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module.exports = function(input, output) {
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function run(e, file) {
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var modules = {}
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var usedVariables = {}
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function resolve(dir, data) {
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var replacements = []
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data = data.replace(/((?:var|let|const|)[\t ]*)([\w_$\.]+)(\s*=\s*)require\(([^\)]+)\)/g, function(match, def, variable, eq, dep) {
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usedVariables[variable] = usedVariables[variable] ? usedVariables[variable]++ : 1
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var filename = new Function("return " + dep).call()
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//resolve npm dependencies
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if (filename[0] !== ".") {
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var meta = JSON.parse(fs.readFileSync("./node_modules/" + filename + "/package.json"))
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var dependencyEntry = "./node_modules/" + filename + "/" + (meta.main || filename + ".js")
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try {fs.statSync(dependencyEntry).isFile()} catch (e) {dependencyEntry = "./node_modules/" + filename + "/index.js"}
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return resolve(path.dirname(dependencyEntry), exportCode(dependencyEntry, def + variable + eq))
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}
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//resolve local dependencies
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var normalized = path.resolve(dir, filename)
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var pathname = path.dirname(normalized)
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if (modules[normalized] === undefined) {
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modules[normalized] = variable
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var exported = exportCode(dir + "/" + filename + ".js", def + variable + eq)
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return resolve(pathname, exported)
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}
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else {
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if (modules[normalized] !== variable) {
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replacements.push({variable: variable, replacement: modules[normalized]})
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}
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return ""
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}
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})
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if (replacements.length > 0) {
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for (var i = 0; i < replacements.length; i++) {
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data = data.replace(new RegExp("\\b" + replacements[i].variable + "\\b", "g"), replacements[i].replacement)
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}
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}
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return data
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.replace(/(?:var|let|const)[\t ]([\w_$\.]+)(\s*=\s*)\1([\r\n;]+)/g, "$3") // remove assignments to itself
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.replace(/([\r\n]){2,}/g, "$1") // remove multiple consecutive line breaks
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.replace(/\}[\r\n]+\(/g, "}(") // remove space from iife
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}
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function exportCode(file, assignment) {
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return fixCollisions(fs.readFileSync(file, "utf8"))
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.replace(/("|')use strict\1;?\s*/gm, "") // remove extraneous "use strict"
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.replace(/module\.exports\s*=\s*/gm, assignment)
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}
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function fixCollisions(code) {
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for (var variable in usedVariables) {
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var collision = new RegExp("\\b" + variable + "\\b(?![\"'`])", "g")
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var exported = new RegExp("module\\.exports\\s*=\\s*" + variable)
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if (collision.test(code) && !exported.test(code)) {
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var fixed = variable + usedVariables[variable]++
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code = code.replace(collision, fixed)
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}
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}
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return code
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}
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function setVersion(code) {
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var metadata = JSON.parse(fs.readFileSync("./package.json"))
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return code.replace("bleeding-edge", metadata.version)
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}
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function bundle(input, output) {
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console.log("bundling...")
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var code = setVersion(resolve(path.dirname(input), fs.readFileSync(input, "utf8")))
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if (new Function(code)) fs.writeFileSync(output, code, "utf8")
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console.log("done")
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}
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if (file !== output && file !== output.replace(/\.js$/, ".min.js")) bundle(input, output)
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}
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run()
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//fs.watch(process.cwd(), {recursive: true}, run)
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}
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