82 lines
2.5 KiB
JavaScript
82 lines
2.5 KiB
JavaScript
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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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module.exports = function (x, opts) {
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if (!opts) opts = {};
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var isFile = opts.isFile || function (file) {
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try { var stat = fs.statSync(file) }
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catch (err) { if (err && err.code === 'ENOENT') return false }
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return stat.isFile() || stat.isFIFO();
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};
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var readFileSync = opts.readFileSync || fs.readFileSync;
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var extensions = opts.extensions || [ '.js' ];
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var y = opts.basedir || path.dirname(caller());
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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(y, x);
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if (x === '..') 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, y);
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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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throw new Error("Cannot find module '" + x + "' from '" + y + "'");
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function loadAsFileSync (x) {
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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 loadAsDirectorySync (x) {
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var pkgfile = path.join(x, '/package.json');
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if (isFile(pkgfile)) {
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var body = readFileSync(pkgfile, 'utf8');
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try {
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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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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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}
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catch (err) {}
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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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