133 lines
3.8 KiB
JavaScript
133 lines
3.8 KiB
JavaScript
var core = require('./core');
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var fs = require('fs');
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var path = require('path');
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var caller = require('./caller.js');
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var nodeModulesPaths = require('./node-modules-paths.js');
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var defaultIsFile = function isFile(file) {
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try {
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var stat = fs.statSync(file);
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} catch (e) {
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if (e && (e.code === 'ENOENT' || e.code === 'ENOTDIR')) return false;
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throw e;
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}
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return stat.isFile() || stat.isFIFO();
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};
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module.exports = function (x, options) {
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if (typeof x !== 'string') {
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throw new TypeError('Path must be a string.');
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}
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var opts = options || {};
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var isFile = opts.isFile || defaultIsFile;
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var readFileSync = opts.readFileSync || fs.readFileSync;
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var extensions = opts.extensions || ['.js'];
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var basedir = opts.basedir || path.dirname(caller());
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var parent = opts.filename || basedir;
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opts.paths = opts.paths || [];
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if (/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/.test(x)) {
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var res = path.resolve(basedir, x);
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if (x === '..' || x.slice(-1) === '/') res += '/';
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var m = loadAsFileSync(res) || loadAsDirectorySync(res);
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if (m) return m;
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} else {
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var n = loadNodeModulesSync(x, basedir);
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if (n) return n;
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}
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if (core[x]) return x;
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var err = new Error("Cannot find module '" + x + "' from '" + parent + "'");
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err.code = 'MODULE_NOT_FOUND';
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throw err;
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function loadAsFileSync(x) {
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var pkg = loadpkg(path.dirname(x));
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if (pkg && pkg.dir && pkg.pkg && opts.pathFilter) {
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var rfile = path.relative(pkg.dir, x);
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var r = opts.pathFilter(pkg.pkg, x, rfile);
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if (r) {
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x = path.resolve(pkg.dir, r); // eslint-disable-line no-param-reassign
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}
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}
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if (isFile(x)) {
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return x;
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}
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for (var i = 0; i < extensions.length; i++) {
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var file = x + extensions[i];
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if (isFile(file)) {
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return file;
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}
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}
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}
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function loadpkg(dir) {
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if (dir === '' || dir === '/') return;
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if (process.platform === 'win32' && (/^\w:[/\\]*$/).test(dir)) {
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return;
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}
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if (/[/\\]node_modules[/\\]*$/.test(dir)) return;
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var pkgfile = path.join(dir, 'package.json');
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if (!isFile(pkgfile)) {
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return loadpkg(path.dirname(dir));
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}
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var body = readFileSync(pkgfile);
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try {
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var pkg = JSON.parse(body);
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} catch (jsonErr) {}
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if (pkg && opts.packageFilter) {
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pkg = opts.packageFilter(pkg, dir);
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}
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return { pkg: pkg, dir: dir };
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}
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function loadAsDirectorySync(x) {
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var pkgfile = path.join(x, '/package.json');
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if (isFile(pkgfile)) {
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try {
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var body = readFileSync(pkgfile, 'UTF8');
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var pkg = JSON.parse(body);
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if (opts.packageFilter) {
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pkg = opts.packageFilter(pkg, x);
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}
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if (pkg.main) {
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if (pkg.main === '.' || pkg.main === './') {
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pkg.main = 'index';
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}
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var m = loadAsFileSync(path.resolve(x, pkg.main));
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if (m) return m;
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var n = loadAsDirectorySync(path.resolve(x, pkg.main));
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if (n) return n;
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}
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} catch (e) {}
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}
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return loadAsFileSync(path.join(x, '/index'));
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}
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function loadNodeModulesSync(x, start) {
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var dirs = nodeModulesPaths(start, opts);
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for (var i = 0; i < dirs.length; i++) {
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var dir = dirs[i];
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var m = loadAsFileSync(path.join(dir, '/', x));
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if (m) return m;
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var n = loadAsDirectorySync(path.join(dir, '/', x));
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if (n) return n;
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}
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}
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};
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