346 lines
9.3 KiB
JavaScript
346 lines
9.3 KiB
JavaScript
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// builtin
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var fs = require('fs');
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var path = require('path');
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// vendor
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var resv = require('resolve');
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// given a path, create an array of node_module paths for it
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// borrowed from substack/resolve
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function nodeModulesPaths (start, cb) {
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var splitRe = process.platform === 'win32' ? /[\/\\]/ : /\/+/;
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var parts = start.split(splitRe);
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var dirs = [];
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for (var i = parts.length - 1; i >= 0; i--) {
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if (parts[i] === 'node_modules') continue;
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var dir = path.join.apply(
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path, parts.slice(0, i + 1).concat(['node_modules'])
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);
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if (!parts[0].match(/([A-Za-z]:)/)) {
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dir = '/' + dir;
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}
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dirs.push(dir);
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}
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return dirs;
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}
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function find_shims_in_package(pkgJson, cur_path, shims, browser) {
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try {
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var info = JSON.parse(pkgJson);
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}
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catch (err) {
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err.message = pkgJson + ' : ' + err.message
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throw err;
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}
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var replacements = getReplacements(info, browser);
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// no replacements, skip shims
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if (!replacements) {
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return;
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}
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// if browser mapping is a string
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// then it just replaces the main entry point
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if (typeof replacements === 'string') {
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var key = path.resolve(cur_path, info.main || 'index.js');
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shims[key] = path.resolve(cur_path, replacements);
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return;
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}
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// http://nodejs.org/api/modules.html#modules_loading_from_node_modules_folders
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Object.keys(replacements).forEach(function(key) {
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var val;
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if (replacements[key] === false) {
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val = path.normalize(__dirname + '/empty.js');
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}
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else {
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val = replacements[key];
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// if target is a relative path, then resolve
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// otherwise we assume target is a module
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if (val[0] === '.') {
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val = path.resolve(cur_path, val);
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}
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}
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if (key[0] === '/' || key[0] === '.') {
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// if begins with / ../ or ./ then we must resolve to a full path
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key = path.resolve(cur_path, key);
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}
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shims[key] = val;
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});
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[ '.js', '.json' ].forEach(function (ext) {
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Object.keys(shims).forEach(function (key) {
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if (!shims[key + ext]) {
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shims[key + ext] = shims[key];
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}
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});
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});
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}
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// paths is mutated
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// load shims from first package.json file found
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function load_shims(paths, browser, cb) {
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// identify if our file should be replaced per the browser field
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// original filename|id -> replacement
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var shims = Object.create(null);
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(function next() {
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var cur_path = paths.shift();
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if (!cur_path) {
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return cb(null, shims);
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}
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var pkg_path = path.join(cur_path, 'package.json');
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fs.readFile(pkg_path, 'utf8', function(err, data) {
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if (err) {
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// ignore paths we can't open
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// avoids an exists check
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if (err.code === 'ENOENT') {
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return next();
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}
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return cb(err);
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}
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try {
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find_shims_in_package(data, cur_path, shims, browser);
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return cb(null, shims);
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}
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catch (err) {
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return cb(err);
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}
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});
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})();
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};
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// paths is mutated
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// synchronously load shims from first package.json file found
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function load_shims_sync(paths, browser) {
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// identify if our file should be replaced per the browser field
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// original filename|id -> replacement
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var shims = Object.create(null);
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var cur_path;
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while (cur_path = paths.shift()) {
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var pkg_path = path.join(cur_path, 'package.json');
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try {
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var data = fs.readFileSync(pkg_path, 'utf8');
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find_shims_in_package(data, cur_path, shims, browser);
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return shims;
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}
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catch (err) {
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// ignore paths we can't open
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// avoids an exists check
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if (err.code === 'ENOENT') {
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continue;
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}
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throw err;
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}
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}
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return shims;
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}
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function build_resolve_opts(opts, base) {
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var packageFilter = opts.packageFilter;
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var browser = normalizeBrowserFieldName(opts.browser)
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opts.basedir = base;
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opts.packageFilter = function (info, pkgdir) {
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if (packageFilter) info = packageFilter(info, pkgdir);
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var replacements = getReplacements(info, browser);
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// no browser field, keep info unchanged
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if (!replacements) {
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return info;
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}
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info[browser] = replacements;
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// replace main
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if (typeof replacements === 'string') {
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info.main = replacements;
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return info;
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}
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var replace_main = replacements[info.main || './index.js'] ||
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replacements['./' + info.main || './index.js'];
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info.main = replace_main || info.main;
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return info;
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};
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var pathFilter = opts.pathFilter;
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opts.pathFilter = function(info, resvPath, relativePath) {
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if (relativePath[0] != '.') {
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relativePath = './' + relativePath;
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}
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var mappedPath;
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if (pathFilter) {
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mappedPath = pathFilter.apply(this, arguments);
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}
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if (mappedPath) {
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return mappedPath;
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}
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var replacements = info[browser];
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if (!replacements) {
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return;
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}
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mappedPath = replacements[relativePath];
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if (!mappedPath && path.extname(relativePath) === '') {
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mappedPath = replacements[relativePath + '.js'];
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if (!mappedPath) {
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mappedPath = replacements[relativePath + '.json'];
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}
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}
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return mappedPath;
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};
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return opts;
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}
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function resolve(id, opts, cb) {
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// opts.filename
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// opts.paths
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// opts.modules
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// opts.packageFilter
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opts = opts || {};
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opts.filename = opts.filename || '';
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var base = path.dirname(opts.filename);
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if (opts.basedir) {
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base = opts.basedir;
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}
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var paths = nodeModulesPaths(base);
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if (opts.paths) {
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paths.push.apply(paths, opts.paths);
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}
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paths = paths.map(function(p) {
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return path.dirname(p);
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});
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// we must always load shims because the browser field could shim out a module
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load_shims(paths, opts.browser, function(err, shims) {
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if (err) {
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return cb(err);
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}
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var resid = path.resolve(opts.basedir || path.dirname(opts.filename), id);
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if (shims[id] || shims[resid]) {
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var xid = shims[id] ? id : resid;
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// if the shim was is an absolute path, it was fully resolved
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if (shims[xid][0] === '/') {
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return resv(shims[xid], build_resolve_opts(opts, base), function(err, full, pkg) {
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cb(null, full, pkg);
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});
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}
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// module -> alt-module shims
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id = shims[xid];
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}
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var modules = opts.modules || Object.create(null);
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var shim_path = modules[id];
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if (shim_path) {
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return cb(null, shim_path);
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}
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// our browser field resolver
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// if browser field is an object tho?
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var full = resv(id, build_resolve_opts(opts, base), function(err, full, pkg) {
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if (err) {
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return cb(err);
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}
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var resolved = (shims) ? shims[full] || full : full;
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cb(null, resolved, pkg);
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});
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});
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};
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resolve.sync = function (id, opts) {
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// opts.filename
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// opts.paths
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// opts.modules
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// opts.packageFilter
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opts = opts || {};
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opts.filename = opts.filename || '';
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var base = path.dirname(opts.filename);
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if (opts.basedir) {
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base = opts.basedir;
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}
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var paths = nodeModulesPaths(base);
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if (opts.paths) {
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paths.push.apply(paths, opts.paths);
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}
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paths = paths.map(function(p) {
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return path.dirname(p);
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});
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// we must always load shims because the browser field could shim out a module
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var shims = load_shims_sync(paths, opts.browser);
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var resid = path.resolve(opts.basedir || path.dirname(opts.filename), id);
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if (shims[id] || shims[resid]) {
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var xid = shims[id] ? id : resid;
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// if the shim was is an absolute path, it was fully resolved
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if (shims[xid][0] === '/') {
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return resv.sync(shims[xid], build_resolve_opts(opts, base));
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}
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// module -> alt-module shims
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id = shims[xid];
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}
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var modules = opts.modules || Object.create(null);
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var shim_path = modules[id];
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if (shim_path) {
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return shim_path;
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}
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// our browser field resolver
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// if browser field is an object tho?
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var full = resv.sync(id, build_resolve_opts(opts, base));
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return (shims) ? shims[full] || full : full;
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};
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function normalizeBrowserFieldName(browser) {
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return browser || 'browser';
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}
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function getReplacements(info, browser) {
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browser = normalizeBrowserFieldName(browser);
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var replacements = info[browser] || info.browser;
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// support legacy browserify field for easier migration from legacy
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// many packages used this field historically
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if (typeof info.browserify === 'string' && !replacements) {
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replacements = info.browserify;
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}
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return replacements;
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}
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module.exports = resolve;
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