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bundler variable disambiguation

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This commit is contained in:
Leo Horie 2016-05-20 22:38:10 -04:00
parent 2ca8fa6e66
commit e5391a1957
10 changed files with 75 additions and 542 deletions
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41
bundler/bundler.js
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@ -4,21 +4,23 @@ var fs = require("fs")
var path = require("path")
var modules = {}
var usedVariables = {}
function resolve(dir, data) {
var replacements = []
data = data.replace(/((?:var|let|const|)\s*)([\w_$]+)(\s*=\s*)require\(([^\)]+)\)/g, function(match, def, variable, eq, dep) {
data = data.replace(/((?:var|let|const|)[\t ]*)([\w_$\.]+)(\s*=\s*)require\(([^\)]+)\)/g, function(match, def, variable, eq, dep) {
usedVariables[variable] = usedVariables[variable] ? usedVariables[variable]++ : 1
var filename = new Function("return " + dep).call()
var pathname = path.dirname(path.resolve(dir, filename))
var normalized = path.normalize(dir + "/" + filename)
var normalized = path.resolve(dir, filename)
var pathname = path.dirname(normalized)
if (modules[normalized] === undefined) {
modules[normalized] = variable
return resolve(pathname,
fs.readFileSync(dir + "/" + filename + ".js", "utf8")
.replace(/"use strict"\s*/gm, "")
.replace(/module\.exports\s*=\s*/gm, def + variable + eq)
//.replace(/module\.exports(\.[\w_$]|\["[^\"]"\])/, def + variable + eq + "{}\n" + variable + "$1")
)
var exported = fixCollisions(fs.readFileSync(dir + "/" + filename + ".js", "utf8"))
.replace(/"use strict"\s*/gm, "") // remove extraneous "use strict"
.replace(/module\.exports\s*=\s*/gm, def + variable + eq)
//.replace(/module\.exports(\.[\w_$]|\["[^\"]"\])/, def + variable + eq + "{}\n" + variable + "$1")
return resolve(pathname, exported)
}
else {
if (modules[normalized] !== variable) {
@ -33,6 +35,25 @@ function resolve(dir, data) {
}
}
return data
.replace(/(?:var|let|const)[\t ]([\w_$\.]+)(\s*=\s*)\1([\r\n;]+)/g, "$3") // remove assignments to itself
.replace(/(\r\n){2,}/g, "$1$1") // remove multiple consecutive line breaks
}
fs.writeFileSync("mithril.js", resolve(".", fs.readFileSync("index.js", "utf8")), "utf8")
function fixCollisions(code) {
for (var variable in usedVariables) {
var collision = new RegExp("\\b" + variable + "\\b(?![\"'`])", "g")
var exported = new RegExp("module\\.exports\\s*=\\s*" + variable)
if (collision.test(code) && !exported.test(code)) {
var fixed = variable + usedVariables[variable]++
code = code.replace(collision, fixed)
}
}
return code
}
function bundle(input, output) {
var code = resolve(".", fs.readFileSync(input, "utf8"))
if (new Function(code)) fs.writeFileSync(output, code, "utf8")
}
bundle("index.js", "mithril.js")