fuse-box/modules/path/index.js

Fuse-Box a bundler that does it right

if (FuseBox.isServer) {
    module.exports = global.require("path");
} else {
    var process = require("process");

    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);
        };

}