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var fs = require('fs');
var path = require('path');
var relativePath = require('cached-path-relative');
var browserResolve = require('browser-resolve');
var nodeResolve = require('resolve');
var detective = require('detective');
var through = require('through2');
var concat = require('concat-stream');
var parents = require('parents');
var combine = require('stream-combiner2');
var duplexer = require('duplexer2');
var xtend = require('xtend');
var defined = require('defined');
var inherits = require('inherits');
var Transform = require('readable-stream').Transform;
module.exports = Deps;
inherits(Deps, Transform);
function Deps (opts) {
var self = this;
if (!(this instanceof Deps)) return new Deps(opts);
Transform.call(this, { objectMode: true });
if (!opts) opts = {};
this.basedir = opts.basedir || process.cwd();
this.persistentCache = opts.persistentCache || function (file, id, pkg, fallback, cb) {
process.nextTick(function () {
fallback(null, cb);
});
};
this.cache = opts.cache;
this.fileCache = opts.fileCache;
this.pkgCache = opts.packageCache || {};
this.pkgFileCache = {};
this.pkgFileCachePending = {};
this._emittedPkg = {};
this._transformDeps = {};
this.visited = {};
this.walking = {};
this.entries = [];
this._input = [];
this.paths = opts.paths || process.env.NODE_PATH || '';
if (typeof this.paths === 'string') {
var delimiter = path.delimiter || (process.platform === 'win32' ? ';' : ':');
this.paths = this.paths.split(delimiter);
}
this.paths = this.paths
.filter(Boolean)
.map(function (p) {
return path.resolve(self.basedir, p);
});
this.transforms = [].concat(opts.transform).filter(Boolean);
this.globalTransforms = [].concat(opts.globalTransform).filter(Boolean);
this.resolver = opts.resolve || browserResolve;
this.detective = opts.detect || detective;
this.options = xtend(opts);
if (!this.options.modules) this.options.modules = {};
// If the caller passes options.expose, store resolved pathnames for exposed
// modules in it. If not, set it anyway so it's defined later.
if (!this.options.expose) this.options.expose = {};
this.pending = 0;
this.inputPending = 0;
var topfile = path.join(this.basedir, '__fake.js');
this.top = {
id: topfile,
filename: topfile,
paths: this.paths,
basedir: this.basedir
};
}
Deps.prototype._isTopLevel = function (file) {
var isTopLevel = this.entries.some(function (main) {
var m = relativePath(path.dirname(main), file);
return m.split(/[\\\/]/).indexOf('node_modules') < 0;
});
if (!isTopLevel) {
var m = relativePath(this.basedir, file);
isTopLevel = m.split(/[\\\/]/).indexOf('node_modules') < 0;
}
return isTopLevel;
};
Deps.prototype._transform = function (row, enc, next) {
var self = this;
if (typeof row === 'string') {
row = { file: row };
}
if (row.transform && row.global) {
this.globalTransforms.push([ row.transform, row.options ]);
return next();
}
else if (row.transform) {
this.transforms.push([ row.transform, row.options ]);
return next();
}
self.pending ++;
var basedir = defined(row.basedir, self.basedir);
if (row.entry !== false) {
self.entries.push(path.resolve(basedir, row.file || row.id));
}
self.lookupPackage(row.file, function (err, pkg) {
if (err && self.options.ignoreMissing) {
self.emit('missing', row.file, self.top);
self.pending --;
return next();
}
if (err) return self.emit('error', err)
self.pending --;
self._input.push({ row: row, pkg: pkg });
next();
});
};
Deps.prototype._flush = function () {
var self = this;
var files = {};
self._input.forEach(function (r) {
var w = r.row, f = files[w.file || w.id];
if (f) {
f.row.entry = f.row.entry || w.entry;
var ex = f.row.expose || w.expose;
f.row.expose = ex;
if (ex && f.row.file === f.row.id && w.file !== w.id) {
f.row.id = w.id;
}
}
else files[w.file || w.id] = r;
});
Object.keys(files).forEach(function (key) {
var r = files[key];
var pkg = r.pkg || {};
var dir = r.row.file ? path.dirname(r.row.file) : self.basedir;
if (!pkg.__dirname) pkg.__dirname = dir;
self.walk(r.row, xtend(self.top, {
filename: path.join(dir, '_fake.js')
}));
});
if (this.pending === 0) this.push(null);
this._ended = true;
};
Deps.prototype.resolve = function (id, parent, cb) {
var self = this;
var opts = self.options;
if (xhas(self.cache, parent.id, 'deps', id)
&& self.cache[parent.id].deps[id]) {
var file = self.cache[parent.id].deps[id];
var pkg = self.pkgCache[file];
if (pkg) return cb(null, file, pkg);
return self.lookupPackage(file, function (err, pkg) {
cb(null, file, pkg);
});
}
parent.packageFilter = function (p, x) {
var pkgdir = path.dirname(x);
if (opts.packageFilter) p = opts.packageFilter(p, x);
p.__dirname = pkgdir;
return p;
};
// have `resolve` do all the package.json lookups,
// see discussion in https://github.com/browserify/browser-resolve/issues/93#issuecomment-667837808
parent.package = undefined;
if (opts.extensions) parent.extensions = opts.extensions;
if (opts.modules) parent.modules = opts.modules;
self.resolver(id, parent, function onresolve (err, file, pkg, fakePath) {
if (err) return cb(err);
if (!file) return cb(new Error(
'module not found: "' + id + '" from file '
+ parent.filename
));
if (!pkg || !pkg.__dirname) {
self.lookupPackage(file, function (err, p) {
if (err) return cb(err);
if (!p) p = {};
if (!p.__dirname) p.__dirname = path.dirname(file);
self.pkgCache[file] = p;
onresolve(err, file, opts.packageFilter
? opts.packageFilter(p, p.__dirname) : p,
fakePath
);
});
}
else cb(err, file, pkg, fakePath);
});
};
Deps.prototype.readFile = function (file, id, pkg) {
var self = this;
if (xhas(this.fileCache, file)) {
return toStream(this.fileCache[file]);
}
var rs = fs.createReadStream(file, {
encoding: 'utf8'
});
return rs;
};
Deps.prototype.getTransforms = function (file, pkg, opts) {
if (!opts) opts = {};
var self = this;
var isTopLevel;
if (opts.builtin || opts.inNodeModules) isTopLevel = false;
else isTopLevel = this._isTopLevel(file);
var transforms = [].concat(isTopLevel ? this.transforms : [])
.concat(getTransforms(pkg, {
globalTransform: this.globalTransforms,
transformKey: this.options.transformKey
}))
;
if (transforms.length === 0) return through();
var pending = transforms.length;
var streams = [];
var input = through();
var output = through();
var dup = duplexer(input, output);
for (var i = 0; i < transforms.length; i++) (function (i) {
makeTransform(transforms[i], function (err, trs) {
if (err) {
return dup.emit('error', err);
}
streams[i] = trs;
if (-- pending === 0) done();
});
})(i);
return dup;
function done () {
var middle = combine.apply(null, streams);
middle.on('error', function (err) {
err.message += ' while parsing file: ' + file;
if (!err.filename) err.filename = file;
dup.emit('error', err);
});
input.pipe(middle).pipe(output);
}
function makeTransform (tr, cb) {
var trOpts = {};
if (Array.isArray(tr)) {
trOpts = tr[1] || {};
tr = tr[0];
}
trOpts._flags = trOpts.hasOwnProperty('_flags') ? trOpts._flags : self.options;
if (typeof tr === 'function') {
var t = tr(file, trOpts);
// allow transforms to `stream.emit('dep', path)` to add dependencies for this file
t.on('dep', function (dep) {
if (!self._transformDeps[file]) self._transformDeps[file] = [];
self._transformDeps[file].push(dep);
});
self.emit('transform', t, file);
nextTick(cb, null, wrapTransform(t));
}
else {
loadTransform(tr, trOpts, function (err, trs) {
if (err) return cb(err);
cb(null, wrapTransform(trs));
});
}
}
function loadTransform (id, trOpts, cb) {
var params = {
basedir: path.dirname(file),
preserveSymlinks: false
};
nodeResolve(id, params, function nr (err, res, again) {
if (err && again) return cb && cb(err);
if (err) {
params.basedir = pkg.__dirname;
return nodeResolve(id, params, function (e, r) {
nr(e, r, true);
});
}
if (!res) return cb(new Error(
'cannot find transform module ' + tr
+ ' while transforming ' + file
));
var r = require(res);
if (typeof r !== 'function') {
return cb(new Error(
'Unexpected ' + typeof r + ' exported by the '
+ JSON.stringify(res) + ' package. '
+ 'Expected a transform function.'
));
}
var trs = r(file, trOpts);
// allow transforms to `stream.emit('dep', path)` to add dependencies for this file
trs.on('dep', function (dep) {
if (!self._transformDeps[file]) self._transformDeps[file] = [];
self._transformDeps[file].push(dep);
});
self.emit('transform', trs, file);
cb(null, trs);
});
}
};
Deps.prototype.walk = function (id, parent, cb) {
var self = this;
var opts = self.options;
this.pending ++;
var rec = {};
var input;
if (typeof id === 'object') {
rec = xtend(id);
if (rec.entry === false) delete rec.entry;
id = rec.file || rec.id;
input = true;
this.inputPending ++;
}
self.resolve(id, parent, function (err, file, pkg, fakePath) {
// this is checked early because parent.modules is also modified
// by this function.
var builtin = has(parent.modules, id);
if (rec.expose) {
// Set options.expose to make the resolved pathname available to the
// caller. They may or may not have requested it, but it's harmless
// to set this if they didn't.
self.options.expose[rec.expose] =
self.options.modules[rec.expose] = file;
}
if (pkg && !self._emittedPkg[pkg.__dirname]) {
self._emittedPkg[pkg.__dirname] = true;
self.emit('package', pkg);
}
if (opts.postFilter && !opts.postFilter(id, file, pkg)) {
if (--self.pending === 0) self.push(null);
if (input) --self.inputPending;
return cb && cb(null, undefined);
}
if (err && rec.source) {
file = rec.file;
var ts = self.getTransforms(file, pkg);
ts.on('error', function (err) {
self.emit('error', err);
});
ts.pipe(concat(function (body) {
rec.source = body.toString('utf8');
fromSource(file, rec.source, pkg);
}));
return ts.end(rec.source);
}
if (err && self.options.ignoreMissing) {
if (--self.pending === 0) self.push(null);
if (input) --self.inputPending;
self.emit('missing', id, parent);
return cb && cb(null, undefined);
}
if (err) {
var message = 'Can\'t walk dependency graph: ' + err.message;
message += '\n required by ' + parent.filename;
err.message = message;
return self.emit('error', err);
}
if (self.visited[file]) {
if (-- self.pending === 0) self.push(null);
if (input) --self.inputPending;
return cb && cb(null, file);
}
self.visited[file] = true;
if (rec.source) {
var ts = self.getTransforms(file, pkg);
ts.on('error', function (err) {
self.emit('error', err);
});
ts.pipe(concat(function (body) {
rec.source = body.toString('utf8');
fromSource(file, rec.source, pkg);
}));
return ts.end(rec.source);
}
var c = self.cache && self.cache[file];
if (c) return fromDeps(file, c.source, c.package, fakePath, Object.keys(c.deps));
self.persistentCache(file, id, pkg, persistentCacheFallback, function (err, c) {
self.emit('file', file, id);
if (err) {
self.emit('error', err);
return;
}
fromDeps(file, c.source, c.package, fakePath, Object.keys(c.deps));
});
function persistentCacheFallback (dataAsString, cb) {
var stream = dataAsString ? toStream(dataAsString) : self.readFile(file, id, pkg).on('error', cb);
stream
.pipe(self.getTransforms(fakePath || file, pkg, {
builtin: builtin,
inNodeModules: parent.inNodeModules
}))
.on('error', cb)
.pipe(concat(function (body) {
var src = body.toString('utf8');
try { var deps = getDeps(file, src); }
catch (err) { cb(err); }
if (deps) {
cb(null, {
source: src,
package: pkg,
deps: deps.reduce(function (deps, dep) {
deps[dep] = true;
return deps;
}, {})
});
}
}));
}
});
function getDeps (file, src) {
var deps = rec.noparse ? [] : self.parseDeps(file, src);
// dependencies emitted by transforms
if (self._transformDeps[file]) deps = deps.concat(self._transformDeps[file]);
return deps;
}
function fromSource (file, src, pkg, fakePath) {
var deps = getDeps(file, src);
if (deps) fromDeps(file, src, pkg, fakePath, deps);
}
function fromDeps (file, src, pkg, fakePath, deps) {
var p = deps.length;
var resolved = {};
if (input) --self.inputPending;
(function resolve () {
if (self.inputPending > 0) return setTimeout(resolve);
deps.forEach(function (id) {
if (opts.filter && !opts.filter(id)) {
resolved[id] = false;
if (--p === 0) done();
return;
}
var isTopLevel = self._isTopLevel(fakePath || file);
var current = {
id: file,
filename: file,
basedir: path.dirname(file),
paths: self.paths,
package: pkg,
inNodeModules: parent.inNodeModules || !isTopLevel
};
self.walk(id, current, function (err, r) {
resolved[id] = r;
if (--p === 0) done();
});
});
if (deps.length === 0) done();
})();
function done () {
if (!rec.id) rec.id = file;
if (!rec.source) rec.source = src;
if (!rec.deps) rec.deps = resolved;
if (!rec.file) rec.file = file;
if (self.entries.indexOf(file) >= 0) {
rec.entry = true;
}
self.push(rec);
if (cb) cb(null, file);
if (-- self.pending === 0) self.push(null);
}
}
};
Deps.prototype.parseDeps = function (file, src, cb) {
var self = this;
if (this.options.noParse === true) return [];
if (/\.json$/.test(file)) return [];
if (Array.isArray(this.options.noParse)
&& this.options.noParse.indexOf(file) >= 0) {
return [];
}
try { var deps = self.detective(src) }
catch (ex) {
var message = ex && ex.message ? ex.message : ex;
throw new Error(
'Parsing file ' + file + ': ' + message
);
}
return deps;
};
Deps.prototype.lookupPackage = function (file, cb) {
var self = this;
var cached = this.pkgCache[file];
if (cached) return nextTick(cb, null, cached);
if (cached === false) return nextTick(cb, null, undefined);
var dirs = parents(file ? path.dirname(file) : self.basedir);
(function next () {
if (dirs.length === 0) {
self.pkgCache[file] = false;
return cb(null, undefined);
}
var dir = dirs.shift();
if (dir.split(/[\\\/]/).slice(-1)[0] === 'node_modules') {
return cb(null, undefined);
}
var pkgfile = path.join(dir, 'package.json');
var cached = self.pkgCache[pkgfile];
if (cached) return nextTick(cb, null, cached);
else if (cached === false) return next();
var pcached = self.pkgFileCachePending[pkgfile];
if (pcached) return pcached.push(onpkg);
pcached = self.pkgFileCachePending[pkgfile] = [];
fs.readFile(pkgfile, function (err, src) {
if (err) return onpkg();
try { var pkg = JSON.parse(src) }
catch (err) {
return onpkg(new Error([
err + ' while parsing json file ' + pkgfile
].join('')));
}
pkg.__dirname = dir;
self.pkgCache[pkgfile] = pkg;
self.pkgCache[file] = pkg;
onpkg(null, pkg);
});
function onpkg (err, pkg) {
if (self.pkgFileCachePending[pkgfile]) {
var fns = self.pkgFileCachePending[pkgfile];
delete self.pkgFileCachePending[pkgfile];
fns.forEach(function (f) { f(err, pkg) });
}
if (err) cb(err);
else if (pkg && typeof pkg === 'object') cb(null, pkg);
else {
self.pkgCache[pkgfile] = false;
next();
}
}
})();
};
function getTransforms (pkg, opts) {
var trx = [];
if (opts.transformKey) {
var n = pkg;
var keys = opts.transformKey;
for (var i = 0; i < keys.length; i++) {
if (n && typeof n === 'object') n = n[keys[i]];
else break;
}
if (i === keys.length) {
trx = [].concat(n).filter(Boolean);
}
}
return trx.concat(opts.globalTransform || []);
}
function nextTick (cb) {
var args = [].slice.call(arguments, 1);
process.nextTick(function () { cb.apply(null, args) });
}
function xhas (obj) {
if (!obj) return false;
for (var i = 1; i < arguments.length; i++) {
var key = arguments[i];
if (!has(obj, key)) return false;
obj = obj[key];
}
return true;
}
function toStream (dataAsString) {
var tr = through();
tr.push(dataAsString);
tr.push(null);
return tr;
}
function has (obj, key) {
return obj && Object.prototype.hasOwnProperty.call(obj, key);
}
function wrapTransform (tr) {
if (typeof tr.read === 'function') return tr;
var input = through(), output = through();
input.pipe(tr).pipe(output);
var wrapper = duplexer(input, output);
tr.on('error', function (err) { wrapper.emit('error', err) });
return wrapper;
}
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