denodify/core_modules/path.js

//TODO wrap properly
    //The rest is `path`, copied from path-browserify
    var path = (function() {
        var exports  = {};
        function normalizeArray(parts, allowAboveRoot) {
            // if the path tries to go above the root, `up` ends up > 0
            var up = 0;
            for (var i = parts.length - 1; i >= 0; i--) {
                var last = parts[i];
                if (last === '.') {
                    parts.splice(i, 1);
                } else if (last === '..') {
                    parts.splice(i, 1);
                    up++;
                } else if (up) {
                    parts.splice(i, 1);
                    up--;
                }
            }

            // if the path is allowed to go above the root, restore leading ..s
            if (allowAboveRoot) {
                for (; up--; up) {
                    parts.unshift('..');
                }
            }

            return parts;
        }

        // Split a filename into [root, dir, basename, ext], unix version
        // 'root' is just a slash, or nothing.
        var splitPathRe =
            /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
        var splitPath = function(filename) {
            return splitPathRe.exec(filename).slice(1);
        };

        // path.resolve([from ...], to)
        // posix version
        exports.resolve = function() {
            var resolvedPath = '',
            resolvedAbsolute = false;

            for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
                var path = (i >= 0) ? arguments[i] : process.cwd();

                    // Skip empty and invalid entries
                if (typeof path !== 'string') {
                    throw new TypeError('Arguments to path.resolve must be strings');
                } else if (!path) {
                    continue;
                }

                resolvedPath = path + '/' + resolvedPath;
                resolvedAbsolute = path.charAt(0) === '/';
            }

            // At this point the path should be resolved to a full absolute path, but
            // handle relative paths to be safe (might happen when process.cwd() fails)

            // Normalize the path
            resolvedPath = normalizeArray(filter(resolvedPath.split('/'), function(p) {
                return !!p;
            }), !resolvedAbsolute).join('/');

            return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
        };

        // path.normalize(path)
        // posix version
        exports.normalize = function(path) {
            var isAbsolute = exports.isAbsolute(path),
            trailingSlash = substr(path, -1) === '/';

            // Normalize the path
            path = normalizeArray(filter(path.split('/'), function(p) {
                return !!p;
                }), !isAbsolute).join('/');

            if (!path && !isAbsolute) {
                path = '.';
            }
            if (path && trailingSlash) {
                path += '/';
            }

            return (isAbsolute ? '/' : '') + path;
        };

        // posix version
        exports.isAbsolute = function(path) {
            return path.charAt(0) === '/';
        };

        // posix version
        exports.join = function() {
            var paths = Array.prototype.slice.call(arguments, 0);
            return exports.normalize(filter(paths, function(p, index) {
                if (typeof p !== 'string') {
                    throw new TypeError('Arguments to path.join must be strings');
                }
                return p;
            }).join('/'));
        };


        // path.relative(from, to)
        // posix version
        exports.relative = function(from, to) {
            from = exports.resolve(from).substr(1);
            to = exports.resolve(to).substr(1);

            function trim(arr) {
                var start = 0;
                for (; start < arr.length; start++) {
                    if (arr[start] !== '') break;
                }

                var end = arr.length - 1;
                for (; end >= 0; end--) {
                    if (arr[end] !== '') break;
                }

                if (start > end) return [];
                return arr.slice(start, end - start + 1);
            }

            var fromParts = trim(from.split('/'));
            var toParts = trim(to.split('/'));

            var length = Math.min(fromParts.length, toParts.length);
            var samePartsLength = length;
            for (var i = 0; i < length; i++) {
                if (fromParts[i] !== toParts[i]) {
                    samePartsLength = i;
                    break;
                }
            }

            var outputParts = [];
            for (var i = samePartsLength; i < fromParts.length; i++) {
                outputParts.push('..');
            }

            outputParts = outputParts.concat(toParts.slice(samePartsLength));

            return outputParts.join('/');
        };

        exports.sep = '/';
        exports.delimiter = ':';

        exports.dirname = function(path) {
            var result = splitPath(path),
            root = result[0],
            dir = result[1];

                if (!root && !dir) {
                    // No dirname whatsoever
                    return '.';
                }

            if (dir) {
                // It has a dirname, strip trailing slash
                dir = dir.substr(0, dir.length - 1);
            }

            return root + dir;
        };


        exports.basename = function(path, ext) {
            var f = splitPath(path)[2];
            // TODO: make this comparison case-insensitive on windows?
            if (ext && f.substr(-1 * ext.length) === ext) {
                f = f.substr(0, f.length - ext.length);
            }
            return f;
        };


        exports.extname = function(path) {
            return splitPath(path)[3];
        };

        function filter (xs, f) {
            if (xs.filter) return xs.filter(f);
            var res = [];
            for (var i = 0; i < xs.length; i++) {
                if (f(xs[i], i, xs)) res.push(xs[i]);
            }
            return res;
        }

        // String.prototype.substr - negative index don't work in IE8
        var substr = 'ab'.substr(-1) === 'b'
            ? function (str, start, len) { return str.substr(start, len) }
        : function (str, start, len) {
            if (start < 0) start = str.length + start;
            return str.substr(start, len);
        };
        return { exports: exports };
    })();
    
    m['path'] = path;
    var Path = path.exports;