AK-21/Graphite-Industrial-Intelligence

1var fs = require('fs');2var getHomedir = require('./homedir');3var path = require('path');4var caller = require('./caller');5var nodeModulesPaths = require('./node-modules-paths');6var normalizeOptions = require('./normalize-options');7var isCore = require('is-core-module');8var $Error = require('es-errors');9var $TypeError = require('es-errors/type');10 11var realpathFS = process.platform !== 'win32' && fs.realpath && typeof fs.realpath.native === 'function' ? fs.realpath.native : fs.realpath;12 13var relativePathRegex = /^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/;14var windowsDriveRegex = /^\w:[/\\]*$/;15var nodeModulesRegex = /[/\\]node_modules[/\\]*$/;16 17var homedir = getHomedir();18function defaultPaths() {19    if (!homedir) return [];20    return [21        path.join(homedir, '.node_modules'),22        path.join(homedir, '.node_libraries')23    ];24}25 26var defaultIsFile = function isFile(file, cb) {27    fs.stat(file, function (err, stat) {28        if (!err) {29            return cb(null, stat.isFile() || stat.isFIFO());30        }31        if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false);32        return cb(err);33    });34};35 36var defaultIsDir = function isDirectory(dir, cb) {37    fs.stat(dir, function (err, stat) {38        if (!err) {39            return cb(null, stat.isDirectory());40        }41        if (err.code === 'ENOENT' || err.code === 'ENOTDIR') return cb(null, false);42        return cb(err);43    });44};45 46var defaultRealpath = function realpath(x, cb) {47    realpathFS(x, function (realpathErr, realPath) {48        if (realpathErr && realpathErr.code !== 'ENOENT') cb(realpathErr);49        else cb(null, realpathErr ? x : realPath);50    });51};52 53function maybeRealpath(realpath, x, opts, cb) {54    if (opts && opts.preserveSymlinks === false) {55        realpath(x, cb);56    } else {57        cb(null, x);58    }59}60 61function defaultReadPackage(readFile, pkgfile, cb) {62    readFile(pkgfile, function (readFileErr, body) {63        if (readFileErr) cb(readFileErr);64        else {65            try {66                var pkg = JSON.parse(body);67                cb(null, pkg);68            } catch (jsonErr) {69                cb(null);70            }71        }72    });73}74 75function getPackageCandidates(x, start, opts) {76    var dirs = nodeModulesPaths(start, opts, x);77    for (var i = 0; i < dirs.length; i++) {78        dirs[i] = path.join(dirs[i], x);79    }80    return dirs;81}82 83module.exports = function resolve(x, options, callback) {84    var cb = callback;85    var opts = options;86    if (typeof options === 'function') {87        cb = opts;88        opts = {};89    }90    if (typeof x !== 'string') {91        var err = new $TypeError('Path must be a string.');92        return process.nextTick(function () {93            cb(err);94        });95    }96 97    opts = normalizeOptions(x, opts);98 99    var isFile = opts.isFile || defaultIsFile;100    var isDirectory = opts.isDirectory || defaultIsDir;101    var readFile = opts.readFile || fs.readFile;102    var realpath = opts.realpath || defaultRealpath;103    var readPackage = opts.readPackage || defaultReadPackage;104    if (opts.readFile && opts.readPackage) {105        var conflictErr = new $TypeError('`readFile` and `readPackage` are mutually exclusive.');106        return process.nextTick(function () {107            cb(conflictErr);108        });109    }110    var packageIterator = opts.packageIterator;111 112    var extensions = opts.extensions || ['.js'];113    var includeCoreModules = opts.includeCoreModules !== false;114    var basedir = opts.basedir || path.dirname(caller());115    var parent = opts.filename || basedir;116 117    opts.paths = opts.paths || defaultPaths();118 119    // ensure that `basedir` is an absolute path at this point, resolving against the process' current working directory120    var absoluteStart = path.resolve(basedir);121 122    maybeRealpath(123        realpath,124        absoluteStart,125        opts,126        function (err, realStart) {127            if (err) cb(err);128            else init(realStart);129        }130    );131 132    var res;133    function init(basedir) {134        if (relativePathRegex.test(x)) {135            res = path.resolve(basedir, x);136            if (x === '.' || x === '..' || x.slice(-1) === '/') res += '/';137            if (x.slice(-1) === '/' && res === basedir) {138                loadAsDirectory(res, opts.package, onfile);139            } else loadAsFile(res, opts.package, onfile);140        } else if (includeCoreModules && isCore(x)) {141            return cb(null, x);142        } else loadNodeModules(x, basedir, function (err, n, pkg) {143            if (err) cb(err);144            else if (n) {145                return maybeRealpath(realpath, n, opts, function (err, realN) {146                    if (err) {147                        cb(err);148                    } else {149                        cb(null, realN, pkg);150                    }151                });152            } else {153                var moduleError = new $Error("Cannot find module '" + x + "' from '" + parent + "'");154                moduleError.code = 'MODULE_NOT_FOUND';155                cb(moduleError);156            }157        });158    }159 160    function onfile(err, m, pkg) {161        if (err) cb(err);162        else if (m) cb(null, m, pkg);163        else loadAsDirectory(res, function (err, d, pkg) {164            if (err) cb(err);165            else if (d) {166                maybeRealpath(realpath, d, opts, function (err, realD) {167                    if (err) {168                        cb(err);169                    } else {170                        cb(null, realD, pkg);171                    }172                });173            } else {174                var moduleError = new $Error("Cannot find module '" + x + "' from '" + parent + "'");175                moduleError.code = 'MODULE_NOT_FOUND';176                cb(moduleError);177            }178        });179    }180 181    function loadAsFile(x, thePackage, callback) {182        var loadAsFilePackage = thePackage;183        var cb = callback;184        if (typeof loadAsFilePackage === 'function') {185            cb = loadAsFilePackage;186            loadAsFilePackage = undefined;187        }188 189        var exts = [''].concat(extensions);190        load(exts, x, loadAsFilePackage);191 192        function load(exts, x, loadPackage) {193            if (exts.length === 0) return cb(null, undefined, loadPackage);194            var file = x + exts[0];195 196            var pkg = loadPackage;197            if (pkg) onpkg(null, pkg);198            else loadpkg(path.dirname(file), onpkg);199 200            function onpkg(err, pkg_, dir) {201                pkg = pkg_;202                if (err) return cb(err);203                if (dir && pkg && opts.pathFilter) {204                    var rfile = path.relative(dir, file);205                    var rel = rfile.slice(0, rfile.length - exts[0].length);206                    var r = opts.pathFilter(pkg, x, rel);207                    if (r) return load(208                        [''].concat(extensions),209                        path.resolve(dir, r),210                        pkg211                    );212                }213                isFile(file, onex);214            }215            function onex(err, ex) {216                if (err) return cb(err);217                if (ex) return cb(null, file, pkg);218                load(exts.slice(1), x, pkg);219            }220        }221    }222 223    function loadpkg(dir, cb) {224        if (dir === '' || dir === '/') return cb(null);225        if (process.platform === 'win32' && windowsDriveRegex.test(dir)) {226            return cb(null);227        }228        if (nodeModulesRegex.test(dir)) return cb(null);229 230        maybeRealpath(realpath, dir, opts, function (unwrapErr, pkgdir) {231            if (unwrapErr) return loadpkg(path.dirname(dir), cb);232            var pkgfile = path.join(pkgdir, 'package.json');233            isFile(pkgfile, function (err, ex) {234                // on err, ex is false235                if (!ex) return loadpkg(path.dirname(dir), cb);236 237                readPackage(readFile, pkgfile, function (err, pkgParam) {238                    if (err) { return cb(err); }239 240                    var pkg = pkgParam;241 242                    if (pkg && opts.packageFilter) {243                        pkg = opts.packageFilter(pkg, pkgfile);244                    }245                    cb(null, pkg, dir);246                });247            });248        });249    }250 251    function loadAsDirectory(x, loadAsDirectoryPackage, callback) {252        var cb = callback;253        var fpkg = loadAsDirectoryPackage;254        if (typeof fpkg === 'function') {255            cb = fpkg;256            fpkg = opts.package;257        }258 259        maybeRealpath(realpath, x, opts, function (unwrapErr, pkgdir) {260            if (unwrapErr) return cb(unwrapErr);261            var pkgfile = path.join(pkgdir, 'package.json');262            isFile(pkgfile, function (err, ex) {263                if (err) return cb(err);264                if (!ex) return loadAsFile(path.join(x, 'index'), fpkg, cb);265 266                readPackage(readFile, pkgfile, function (err, pkgParam) {267                    if (err) return cb(err);268 269                    var pkg = pkgParam;270 271                    if (pkg && opts.packageFilter) {272                        pkg = opts.packageFilter(pkg, pkgfile);273                    }274 275                    if (pkg && pkg.main) {276                        if (typeof pkg.main !== 'string') {277                            var mainError = new $TypeError('package “' + pkg.name + '” `main` must be a string');278                            mainError.code = 'INVALID_PACKAGE_MAIN';279                            return cb(mainError);280                        }281                        if (pkg.main === '.' || pkg.main === './') {282                            pkg.main = 'index';283                        }284                        loadAsFile(path.resolve(x, pkg.main), pkg, function (err, m, pkg) {285                            if (err) return cb(err);286                            if (m) return cb(null, m, pkg);287                            if (!pkg) return loadAsFile(path.join(x, 'index'), pkg, cb);288 289                            var dir = path.resolve(x, pkg.main);290                            loadAsDirectory(dir, pkg, function (err, n, pkg) {291                                if (err) return cb(err);292                                if (n) return cb(null, n, pkg);293                                loadAsFile(path.join(x, 'index'), pkg, cb);294                            });295                        });296                        return;297                    }298 299                    loadAsFile(path.join(x, '/index'), pkg, cb);300                });301            });302        });303    }304 305    function processDirs(cb, dirs) {306        if (dirs.length === 0) return cb(null, undefined);307        var dir = dirs[0];308 309        isDirectory(path.dirname(dir), isdir);310 311        function isdir(err, isdir) {312            if (err) return cb(err);313            if (!isdir) return processDirs(cb, dirs.slice(1));314            loadAsFile(dir, opts.package, onfile);315        }316 317        function onfile(err, m, pkg) {318            if (err) return cb(err);319            if (m) return cb(null, m, pkg);320            loadAsDirectory(dir, opts.package, ondir);321        }322 323        function ondir(err, n, pkg) {324            if (err) return cb(err);325            if (n) return cb(null, n, pkg);326            processDirs(cb, dirs.slice(1));327        }328    }329    function loadNodeModules(x, start, cb) {330        var thunk = function () { return getPackageCandidates(x, start, opts); };331        processDirs(332            cb,333            packageIterator ? packageIterator(x, start, thunk, opts) : thunk()334        );335    }336};337