/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
define(["require", "exports", "vs/base/common/process"], function (require, exports, process) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.delimiter = exports.sep = exports.toNamespacedPath = exports.parse = exports.format = exports.extname = exports.basename = exports.dirname = exports.relative = exports.resolve = exports.join = exports.isAbsolute = exports.normalize = exports.posix = exports.win32 = void 0;
    const CHAR_UPPERCASE_A = 65; /* A */
    const CHAR_LOWERCASE_A = 97; /* a */
    const CHAR_UPPERCASE_Z = 90; /* Z */
    const CHAR_LOWERCASE_Z = 122; /* z */
    const CHAR_DOT = 46; /* . */
    const CHAR_FORWARD_SLASH = 47; /* / */
    const CHAR_BACKWARD_SLASH = 92; /* \ */
    const CHAR_COLON = 58; /* : */
    const CHAR_QUESTION_MARK = 63; /* ? */
    class ErrorInvalidArgType extends Error {
        constructor(name, expected, actual) {
            // determiner: 'must be' or 'must not be'
            let determiner;
            if (typeof expected === 'string' && expected.indexOf('not ') === 0) {
                determiner = 'must not be';
                expected = expected.replace(/^not /, '');
            }
            else {
                determiner = 'must be';
            }
            const type = name.indexOf('.') !== -1 ? 'property' : 'argument';
            let msg = `The "${name}" ${type} ${determiner} of type ${expected}`;
            msg += `. Received type ${typeof actual}`;
            super(msg);
            this.code = 'ERR_INVALID_ARG_TYPE';
        }
    }
    function validateString(value, name) {
        if (typeof value !== 'string') {
            throw new ErrorInvalidArgType(name, 'string', value);
        }
    }
    function isPathSeparator(code) {
        return code === CHAR_FORWARD_SLASH || code === CHAR_BACKWARD_SLASH;
    }
    function isPosixPathSeparator(code) {
        return code === CHAR_FORWARD_SLASH;
    }
    function isWindowsDeviceRoot(code) {
        return code >= CHAR_UPPERCASE_A && code <= CHAR_UPPERCASE_Z ||
            code >= CHAR_LOWERCASE_A && code <= CHAR_LOWERCASE_Z;
    }
    // Resolves . and .. elements in a path with directory names
    function normalizeString(path, allowAboveRoot, separator, isPathSeparator) {
        let res = '';
        let lastSegmentLength = 0;
        let lastSlash = -1;
        let dots = 0;
        let code = 0;
        for (let i = 0; i <= path.length; ++i) {
            if (i < path.length) {
                code = path.charCodeAt(i);
            }
            else if (isPathSeparator(code)) {
                break;
            }
            else {
                code = CHAR_FORWARD_SLASH;
            }
            if (isPathSeparator(code)) {
                if (lastSlash === i - 1 || dots === 1) {
                    // NOOP
                }
                else if (dots === 2) {
                    if (res.length < 2 || lastSegmentLength !== 2 ||
                        res.charCodeAt(res.length - 1) !== CHAR_DOT ||
                        res.charCodeAt(res.length - 2) !== CHAR_DOT) {
                        if (res.length > 2) {
                            const lastSlashIndex = res.lastIndexOf(separator);
                            if (lastSlashIndex === -1) {
                                res = '';
                                lastSegmentLength = 0;
                            }
                            else {
                                res = res.slice(0, lastSlashIndex);
                                lastSegmentLength = res.length - 1 - res.lastIndexOf(separator);
                            }
                            lastSlash = i;
                            dots = 0;
                            continue;
                        }
                        else if (res.length !== 0) {
                            res = '';
                            lastSegmentLength = 0;
                            lastSlash = i;
                            dots = 0;
                            continue;
                        }
                    }
                    if (allowAboveRoot) {
                        res += res.length > 0 ? `${separator}..` : '..';
                        lastSegmentLength = 2;
                    }
                }
                else {
                    if (res.length > 0) {
                        res += `${separator}${path.slice(lastSlash + 1, i)}`;
                    }
                    else {
                        res = path.slice(lastSlash + 1, i);
                    }
                    lastSegmentLength = i - lastSlash - 1;
                }
                lastSlash = i;
                dots = 0;
            }
            else if (code === CHAR_DOT && dots !== -1) {
                ++dots;
            }
            else {
                dots = -1;
            }
        }
        return res;
    }
    function _format(sep, pathObject) {
        if (pathObject === null || typeof pathObject !== 'object') {
            throw new ErrorInvalidArgType('pathObject', 'Object', pathObject);
        }
        const dir = pathObject.dir || pathObject.root;
        const base = pathObject.base ||
            `${pathObject.name || ''}${pathObject.ext || ''}`;
        if (!dir) {
            return base;
        }
        return dir === pathObject.root ? `${dir}${base}` : `${dir}${sep}${base}`;
    }
    exports.win32 = {
        // path.resolve([from ...], to)
        resolve(...pathSegments) {
            let resolvedDevice = '';
            let resolvedTail = '';
            let resolvedAbsolute = false;
            for (let i = pathSegments.length - 1; i >= -1; i--) {
                let path;
                if (i >= 0) {
                    path = pathSegments[i];
                    validateString(path, 'path');
                    // Skip empty entries
                    if (path.length === 0) {
                        continue;
                    }
                }
                else if (resolvedDevice.length === 0) {
                    path = process.cwd();
                }
                else {
                    // Windows has the concept of drive-specific current working
                    // directories. If we've resolved a drive letter but not yet an
                    // absolute path, get cwd for that drive, or the process cwd if
                    // the drive cwd is not available. We're sure the device is not
                    // a UNC path at this points, because UNC paths are always absolute.
                    path = process.env[`=${resolvedDevice}`] || process.cwd();
                    // Verify that a cwd was found and that it actually points
                    // to our drive. If not, default to the drive's root.
                    if (path === undefined ||
                        path.slice(0, 2).toLowerCase() !== resolvedDevice.toLowerCase() &&
                            path.charCodeAt(2) === CHAR_BACKWARD_SLASH) {
                        path = `${resolvedDevice}\\`;
                    }
                }
                const len = path.length;
                let rootEnd = 0;
                let device = '';
                let isAbsolute = false;
                const code = path.charCodeAt(0);
                // Try to match a root
                if (len === 1) {
                    if (isPathSeparator(code)) {
                        // `path` contains just a path separator
                        rootEnd = 1;
                        isAbsolute = true;
                    }
                }
                else if (isPathSeparator(code)) {
                    // Possible UNC root
                    // If we started with a separator, we know we at least have an
                    // absolute path of some kind (UNC or otherwise)
                    isAbsolute = true;
                    if (isPathSeparator(path.charCodeAt(1))) {
                        // Matched double path separator at beginning
                        let j = 2;
                        let last = j;
                        // Match 1 or more non-path separators
                        while (j < len && !isPathSeparator(path.charCodeAt(j))) {
                            j++;
                        }
                        if (j < len && j !== last) {
                            const firstPart = path.slice(last, j);
                            // Matched!
                            last = j;
                            // Match 1 or more path separators
                            while (j < len && isPathSeparator(path.charCodeAt(j))) {
                                j++;
                            }
                            if (j < len && j !== last) {
                                // Matched!
                                last = j;
                                // Match 1 or more non-path separators
                                while (j < len && !isPathSeparator(path.charCodeAt(j))) {
                                    j++;
                                }
                                if (j === len || j !== last) {
                                    // We matched a UNC root
                                    device = `\\\\${firstPart}\\${path.slice(last, j)}`;
                                    rootEnd = j;
                                }
                            }
                        }
                    }
                    else {
                        rootEnd = 1;
                    }
                }
                else if (isWindowsDeviceRoot(code) &&
                    path.charCodeAt(1) === CHAR_COLON) {
                    // Possible device root
                    device = path.slice(0, 2);
                    rootEnd = 2;
                    if (len > 2 && isPathSeparator(path.charCodeAt(2))) {
                        // Treat separator following drive name as an absolute path
                        // indicator
                        isAbsolute = true;
                        rootEnd = 3;
                    }
                }
                if (device.length > 0) {
                    if (resolvedDevice.length > 0) {
                        if (device.toLowerCase() !== resolvedDevice.toLowerCase()) {
                            // This path points to another device so it is not applicable
                            continue;
                        }
                    }
                    else {
                        resolvedDevice = device;
                    }
                }
                if (resolvedAbsolute) {
                    if (resolvedDevice.length > 0) {
                        break;
                    }
                }
                else {
                    resolvedTail = `${path.slice(rootEnd)}\\${resolvedTail}`;
                    resolvedAbsolute = isAbsolute;
                    if (isAbsolute && resolvedDevice.length > 0) {
                        break;
                    }
                }
            }
            // 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 tail path
            resolvedTail = normalizeString(resolvedTail, !resolvedAbsolute, '\\', isPathSeparator);
            return resolvedAbsolute ?
                `${resolvedDevice}\\${resolvedTail}` :
                `${resolvedDevice}${resolvedTail}` || '.';
        },
        normalize(path) {
            validateString(path, 'path');
            const len = path.length;
            if (len === 0) {
                return '.';
            }
            let rootEnd = 0;
            let device;
            let isAbsolute = false;
            const code = path.charCodeAt(0);
            // Try to match a root
            if (len === 1) {
                // `path` contains just a single char, exit early to avoid
                // unnecessary work
                return isPosixPathSeparator(code) ? '\\' : path;
            }
            if (isPathSeparator(code)) {
                // Possible UNC root
                // If we started with a separator, we know we at least have an absolute
                // path of some kind (UNC or otherwise)
                isAbsolute = true;
                if (isPathSeparator(path.charCodeAt(1))) {
                    // Matched double path separator at beginning
                    let j = 2;
                    let last = j;
                    // Match 1 or more non-path separators
                    while (j < len && !isPathSeparator(path.charCodeAt(j))) {
                        j++;
                    }
                    if (j < len && j !== last) {
                        const firstPart = path.slice(last, j);
                        // Matched!
                        last = j;
                        // Match 1 or more path separators
                        while (j < len && isPathSeparator(path.charCodeAt(j))) {
                            j++;
                        }
                        if (j < len && j !== last) {
                            // Matched!
                            last = j;
                            // Match 1 or more non-path separators
                            while (j < len && !isPathSeparator(path.charCodeAt(j))) {
                                j++;
                            }
                            if (j === len) {
                                // We matched a UNC root only
                                // Return the normalized version of the UNC root since there
                                // is nothing left to process
                                return `\\\\${firstPart}\\${path.slice(last)}\\`;
                            }
                            if (j !== last) {
                                // We matched a UNC root with leftovers
                                device = `\\\\${firstPart}\\${path.slice(last, j)}`;
                                rootEnd = j;
                            }
                        }
                    }
                }
                else {
                    rootEnd = 1;
                }
            }
            else if (isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON) {
                // Possible device root
                device = path.slice(0, 2);
                rootEnd = 2;
                if (len > 2 && isPathSeparator(path.charCodeAt(2))) {
                    // Treat separator following drive name as an absolute path
                    // indicator
                    isAbsolute = true;
                    rootEnd = 3;
                }
            }
            let tail = rootEnd < len ?
                normalizeString(path.slice(rootEnd), !isAbsolute, '\\', isPathSeparator) :
                '';
            if (tail.length === 0 && !isAbsolute) {
                tail = '.';
            }
            if (tail.length > 0 && isPathSeparator(path.charCodeAt(len - 1))) {
                tail += '\\';
            }
            if (device === undefined) {
                return isAbsolute ? `\\${tail}` : tail;
            }
            return isAbsolute ? `${device}\\${tail}` : `${device}${tail}`;
        },
        isAbsolute(path) {
            validateString(path, 'path');
            const len = path.length;
            if (len === 0) {
                return false;
            }
            const code = path.charCodeAt(0);
            return isPathSeparator(code) ||
                // Possible device root
                len > 2 &&
                    isWindowsDeviceRoot(code) &&
                    path.charCodeAt(1) === CHAR_COLON &&
                    isPathSeparator(path.charCodeAt(2));
        },
        join(...paths) {
            if (paths.length === 0) {
                return '.';
            }
            let joined;
            let firstPart;
            for (let i = 0; i < paths.length; ++i) {
                const arg = paths[i];
                validateString(arg, 'path');
                if (arg.length > 0) {
                    if (joined === undefined) {
                        joined = firstPart = arg;
                    }
                    else {
                        joined += `\\${arg}`;
                    }
                }
            }
            if (joined === undefined) {
                return '.';
            }
            // Make sure that the joined path doesn't start with two slashes, because
            // normalize() will mistake it for an UNC path then.
            //
            // This step is skipped when it is very clear that the user actually
            // intended to point at an UNC path. This is assumed when the first
            // non-empty string arguments starts with exactly two slashes followed by
            // at least one more non-slash character.
            //
            // Note that for normalize() to treat a path as an UNC path it needs to
            // have at least 2 components, so we don't filter for that here.
            // This means that the user can use join to construct UNC paths from
            // a server name and a share name; for example:
            //   path.join('//server', 'share') -> '\\\\server\\share\\')
            let needsReplace = true;
            let slashCount = 0;
            if (typeof firstPart === 'string' && isPathSeparator(firstPart.charCodeAt(0))) {
                ++slashCount;
                const firstLen = firstPart.length;
                if (firstLen > 1 && isPathSeparator(firstPart.charCodeAt(1))) {
                    ++slashCount;
                    if (firstLen > 2) {
                        if (isPathSeparator(firstPart.charCodeAt(2))) {
                            ++slashCount;
                        }
                        else {
                            // We matched a UNC path in the first part
                            needsReplace = false;
                        }
                    }
                }
            }
            if (needsReplace) {
                // Find any more consecutive slashes we need to replace
                while (slashCount < joined.length &&
                    isPathSeparator(joined.charCodeAt(slashCount))) {
                    slashCount++;
                }
                // Replace the slashes if needed
                if (slashCount >= 2) {
                    joined = `\\${joined.slice(slashCount)}`;
                }
            }
            return exports.win32.normalize(joined);
        },
        // It will solve the relative path from `from` to `to`, for instance:
        //  from = 'C:\\orandea\\test\\aaa'
        //  to = 'C:\\orandea\\impl\\bbb'
        // The output of the function should be: '..\\..\\impl\\bbb'
        relative(from, to) {
            validateString(from, 'from');
            validateString(to, 'to');
            if (from === to) {
                return '';
            }
            const fromOrig = exports.win32.resolve(from);
            const toOrig = exports.win32.resolve(to);
            if (fromOrig === toOrig) {
                return '';
            }
            from = fromOrig.toLowerCase();
            to = toOrig.toLowerCase();
            if (from === to) {
                return '';
            }
            // Trim any leading backslashes
            let fromStart = 0;
            while (fromStart < from.length &&
                from.charCodeAt(fromStart) === CHAR_BACKWARD_SLASH) {
                fromStart++;
            }
            // Trim trailing backslashes (applicable to UNC paths only)
            let fromEnd = from.length;
            while (fromEnd - 1 > fromStart &&
                from.charCodeAt(fromEnd - 1) === CHAR_BACKWARD_SLASH) {
                fromEnd--;
            }
            const fromLen = fromEnd - fromStart;
            // Trim any leading backslashes
            let toStart = 0;
            while (toStart < to.length &&
                to.charCodeAt(toStart) === CHAR_BACKWARD_SLASH) {
                toStart++;
            }
            // Trim trailing backslashes (applicable to UNC paths only)
            let toEnd = to.length;
            while (toEnd - 1 > toStart &&
                to.charCodeAt(toEnd - 1) === CHAR_BACKWARD_SLASH) {
                toEnd--;
            }
            const toLen = toEnd - toStart;
            // Compare paths to find the longest common path from root
            const length = fromLen < toLen ? fromLen : toLen;
            let lastCommonSep = -1;
            let i = 0;
            for (; i < length; i++) {
                const fromCode = from.charCodeAt(fromStart + i);
                if (fromCode !== to.charCodeAt(toStart + i)) {
                    break;
                }
                else if (fromCode === CHAR_BACKWARD_SLASH) {
                    lastCommonSep = i;
                }
            }
            // We found a mismatch before the first common path separator was seen, so
            // return the original `to`.
            if (i !== length) {
                if (lastCommonSep === -1) {
                    return toOrig;
                }
            }
            else {
                if (toLen > length) {
                    if (to.charCodeAt(toStart + i) === CHAR_BACKWARD_SLASH) {
                        // We get here if `from` is the exact base path for `to`.
                        // For example: from='C:\\foo\\bar'; to='C:\\foo\\bar\\baz'
                        return toOrig.slice(toStart + i + 1);
                    }
                    if (i === 2) {
                        // We get here if `from` is the device root.
                        // For example: from='C:\\'; to='C:\\foo'
                        return toOrig.slice(toStart + i);
                    }
                }
                if (fromLen > length) {
                    if (from.charCodeAt(fromStart + i) === CHAR_BACKWARD_SLASH) {
                        // We get here if `to` is the exact base path for `from`.
                        // For example: from='C:\\foo\\bar'; to='C:\\foo'
                        lastCommonSep = i;
                    }
                    else if (i === 2) {
                        // We get here if `to` is the device root.
                        // For example: from='C:\\foo\\bar'; to='C:\\'
                        lastCommonSep = 3;
                    }
                }
                if (lastCommonSep === -1) {
                    lastCommonSep = 0;
                }
            }
            let out = '';
            // Generate the relative path based on the path difference between `to` and
            // `from`
            for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
                if (i === fromEnd || from.charCodeAt(i) === CHAR_BACKWARD_SLASH) {
                    out += out.length === 0 ? '..' : '\\..';
                }
            }
            toStart += lastCommonSep;
            // Lastly, append the rest of the destination (`to`) path that comes after
            // the common path parts
            if (out.length > 0) {
                return `${out}${toOrig.slice(toStart, toEnd)}`;
            }
            if (toOrig.charCodeAt(toStart) === CHAR_BACKWARD_SLASH) {
                ++toStart;
            }
            return toOrig.slice(toStart, toEnd);
        },
        toNamespacedPath(path) {
            // Note: this will *probably* throw somewhere.
            if (typeof path !== 'string') {
                return path;
            }
            if (path.length === 0) {
                return '';
            }
            const resolvedPath = exports.win32.resolve(path);
            if (resolvedPath.length <= 2) {
                return path;
            }
            if (resolvedPath.charCodeAt(0) === CHAR_BACKWARD_SLASH) {
                // Possible UNC root
                if (resolvedPath.charCodeAt(1) === CHAR_BACKWARD_SLASH) {
                    const code = resolvedPath.charCodeAt(2);
                    if (code !== CHAR_QUESTION_MARK && code !== CHAR_DOT) {
                        // Matched non-long UNC root, convert the path to a long UNC path
                        return `\\\\?\\UNC\\${resolvedPath.slice(2)}`;
                    }
                }
            }
            else if (isWindowsDeviceRoot(resolvedPath.charCodeAt(0)) &&
                resolvedPath.charCodeAt(1) === CHAR_COLON &&
                resolvedPath.charCodeAt(2) === CHAR_BACKWARD_SLASH) {
                // Matched device root, convert the path to a long UNC path
                return `\\\\?\\${resolvedPath}`;
            }
            return path;
        },
        dirname(path) {
            validateString(path, 'path');
            const len = path.length;
            if (len === 0) {
                return '.';
            }
            let rootEnd = -1;
            let offset = 0;
            const code = path.charCodeAt(0);
            if (len === 1) {
                // `path` contains just a path separator, exit early to avoid
                // unnecessary work or a dot.
                return isPathSeparator(code) ? path : '.';
            }
            // Try to match a root
            if (isPathSeparator(code)) {
                // Possible UNC root
                rootEnd = offset = 1;
                if (isPathSeparator(path.charCodeAt(1))) {
                    // Matched double path separator at beginning
                    let j = 2;
                    let last = j;
                    // Match 1 or more non-path separators
                    while (j < len && !isPathSeparator(path.charCodeAt(j))) {
                        j++;
                    }
                    if (j < len && j !== last) {
                        // Matched!
                        last = j;
                        // Match 1 or more path separators
                        while (j < len && isPathSeparator(path.charCodeAt(j))) {
                            j++;
                        }
                        if (j < len && j !== last) {
                            // Matched!
                            last = j;
                            // Match 1 or more non-path separators
                            while (j < len && !isPathSeparator(path.charCodeAt(j))) {
                                j++;
                            }
                            if (j === len) {
                                // We matched a UNC root only
                                return path;
                            }
                            if (j !== last) {
                                // We matched a UNC root with leftovers
                                // Offset by 1 to include the separator after the UNC root to
                                // treat it as a "normal root" on top of a (UNC) root
                                rootEnd = offset = j + 1;
                            }
                        }
                    }
                }
                // Possible device root
            }
            else if (isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON) {
                rootEnd = len > 2 && isPathSeparator(path.charCodeAt(2)) ? 3 : 2;
                offset = rootEnd;
            }
            let end = -1;
            let matchedSlash = true;
            for (let i = len - 1; i >= offset; --i) {
                if (isPathSeparator(path.charCodeAt(i))) {
                    if (!matchedSlash) {
                        end = i;
                        break;
                    }
                }
                else {
                    // We saw the first non-path separator
                    matchedSlash = false;
                }
            }
            if (end === -1) {
                if (rootEnd === -1) {
                    return '.';
                }
                end = rootEnd;
            }
            return path.slice(0, end);
        },
        basename(path, ext) {
            if (ext !== undefined) {
                validateString(ext, 'ext');
            }
            validateString(path, 'path');
            let start = 0;
            let end = -1;
            let matchedSlash = true;
            let i;
            // Check for a drive letter prefix so as not to mistake the following
            // path separator as an extra separator at the end of the path that can be
            // disregarded
            if (path.length >= 2 &&
                isWindowsDeviceRoot(path.charCodeAt(0)) &&
                path.charCodeAt(1) === CHAR_COLON) {
                start = 2;
            }
            if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
                if (ext === path) {
                    return '';
                }
                let extIdx = ext.length - 1;
                let firstNonSlashEnd = -1;
                for (i = path.length - 1; i >= start; --i) {
                    const code = path.charCodeAt(i);
                    if (isPathSeparator(code)) {
                        // If we reached a path separator that was not part of a set of path
                        // separators at the end of the string, stop now
                        if (!matchedSlash) {
                            start = i + 1;
                            break;
                        }
                    }
                    else {
                        if (firstNonSlashEnd === -1) {
                            // We saw the first non-path separator, remember this index in case
                            // we need it if the extension ends up not matching
                            matchedSlash = false;
                            firstNonSlashEnd = i + 1;
                        }
                        if (extIdx >= 0) {
                            // Try to match the explicit extension
                            if (code === ext.charCodeAt(extIdx)) {
                                if (--extIdx === -1) {
                                    // We matched the extension, so mark this as the end of our path
                                    // component
                                    end = i;
                                }
                            }
                            else {
                                // Extension does not match, so our result is the entire path
                                // component
                                extIdx = -1;
                                end = firstNonSlashEnd;
                            }
                        }
                    }
                }
                if (start === end) {
                    end = firstNonSlashEnd;
                }
                else if (end === -1) {
                    end = path.length;
                }
                return path.slice(start, end);
            }
            for (i = path.length - 1; i >= start; --i) {
                if (isPathSeparator(path.charCodeAt(i))) {
                    // If we reached a path separator that was not part of a set of path
                    // separators at the end of the string, stop now
                    if (!matchedSlash) {
                        start = i + 1;
                        break;
                    }
                }
                else if (end === -1) {
                    // We saw the first non-path separator, mark this as the end of our
                    // path component
                    matchedSlash = false;
                    end = i + 1;
                }
            }
            if (end === -1) {
                return '';
            }
            return path.slice(start, end);
        },
        extname(path) {
            validateString(path, 'path');
            let start = 0;
            let startDot = -1;
            let startPart = 0;
            let end = -1;
            let matchedSlash = true;
            // Track the state of characters (if any) we see before our first dot and
            // after any path separator we find
            let preDotState = 0;
            // Check for a drive letter prefix so as not to mistake the following
            // path separator as an extra separator at the end of the path that can be
            // disregarded
            if (path.length >= 2 &&
                path.charCodeAt(1) === CHAR_COLON &&
                isWindowsDeviceRoot(path.charCodeAt(0))) {
                start = startPart = 2;
            }
            for (let i = path.length - 1; i >= start; --i) {
                const code = path.charCodeAt(i);
                if (isPathSeparator(code)) {
                    // If we reached a path separator that was not part of a set of path
                    // separators at the end of the string, stop now
                    if (!matchedSlash) {
                        startPart = i + 1;
                        break;
                    }
                    continue;
                }
                if (end === -1) {
                    // We saw the first non-path separator, mark this as the end of our
                    // extension
                    matchedSlash = false;
                    end = i + 1;
                }
                if (code === CHAR_DOT) {
                    // If this is our first dot, mark it as the start of our extension
                    if (startDot === -1) {
                        startDot = i;
                    }
                    else if (preDotState !== 1) {
                        preDotState = 1;
                    }
                }
                else if (startDot !== -1) {
                    // We saw a non-dot and non-path separator before our dot, so we should
                    // have a good chance at having a non-empty extension
                    preDotState = -1;
                }
            }
            if (startDot === -1 ||
                end === -1 ||
                // We saw a non-dot character immediately before the dot
                preDotState === 0 ||
                // The (right-most) trimmed path component is exactly '..'
                (preDotState === 1 &&
                    startDot === end - 1 &&
                    startDot === startPart + 1)) {
                return '';
            }
            return path.slice(startDot, end);
        },
        format: _format.bind(null, '\\'),
        parse(path) {
            validateString(path, 'path');
            const ret = { root: '', dir: '', base: '', ext: '', name: '' };
            if (path.length === 0) {
                return ret;
            }
            const len = path.length;
            let rootEnd = 0;
            let code = path.charCodeAt(0);
            if (len === 1) {
                if (isPathSeparator(code)) {
                    // `path` contains just a path separator, exit early to avoid
                    // unnecessary work
                    ret.root = ret.dir = path;
                    return ret;
                }
                ret.base = ret.name = path;
                return ret;
            }
            // Try to match a root
            if (isPathSeparator(code)) {
                // Possible UNC root
                rootEnd = 1;
                if (isPathSeparator(path.charCodeAt(1))) {
                    // Matched double path separator at beginning
                    let j = 2;
                    let last = j;
                    // Match 1 or more non-path separators
                    while (j < len && !isPathSeparator(path.charCodeAt(j))) {
                        j++;
                    }
                    if (j < len && j !== last) {
                        // Matched!
                        last = j;
                        // Match 1 or more path separators
                        while (j < len && isPathSeparator(path.charCodeAt(j))) {
                            j++;
                        }
                        if (j < len && j !== last) {
                            // Matched!
                            last = j;
                            // Match 1 or more non-path separators
                            while (j < len && !isPathSeparator(path.charCodeAt(j))) {
                                j++;
                            }
                            if (j === len) {
                                // We matched a UNC root only
                                rootEnd = j;
                            }
                            else if (j !== last) {
                                // We matched a UNC root with leftovers
                                rootEnd = j + 1;
                            }
                        }
                    }
                }
            }
            else if (isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON) {
                // Possible device root
                if (len <= 2) {
                    // `path` contains just a drive root, exit early to avoid
                    // unnecessary work
                    ret.root = ret.dir = path;
                    return ret;
                }
                rootEnd = 2;
                if (isPathSeparator(path.charCodeAt(2))) {
                    if (len === 3) {
                        // `path` contains just a drive root, exit early to avoid
                        // unnecessary work
                        ret.root = ret.dir = path;
                        return ret;
                    }
                    rootEnd = 3;
                }
            }
            if (rootEnd > 0) {
                ret.root = path.slice(0, rootEnd);
            }
            let startDot = -1;
            let startPart = rootEnd;
            let end = -1;
            let matchedSlash = true;
            let i = path.length - 1;
            // Track the state of characters (if any) we see before our first dot and
            // after any path separator we find
            let preDotState = 0;
            // Get non-dir info
            for (; i >= rootEnd; --i) {
                code = path.charCodeAt(i);
                if (isPathSeparator(code)) {
                    // If we reached a path separator that was not part of a set of path
                    // separators at the end of the string, stop now
                    if (!matchedSlash) {
                        startPart = i + 1;
                        break;
                    }
                    continue;
                }
                if (end === -1) {
                    // We saw the first non-path separator, mark this as the end of our
                    // extension
                    matchedSlash = false;
                    end = i + 1;
                }
                if (code === CHAR_DOT) {
                    // If this is our first dot, mark it as the start of our extension
                    if (startDot === -1) {
                        startDot = i;
                    }
                    else if (preDotState !== 1) {
                        preDotState = 1;
                    }
                }
                else if (startDot !== -1) {
                    // We saw a non-dot and non-path separator before our dot, so we should
                    // have a good chance at having a non-empty extension
                    preDotState = -1;
                }
            }
            if (end !== -1) {
                if (startDot === -1 ||
                    // We saw a non-dot character immediately before the dot
                    preDotState === 0 ||
                    // The (right-most) trimmed path component is exactly '..'
                    (preDotState === 1 &&
                        startDot === end - 1 &&
                        startDot === startPart + 1)) {
                    ret.base = ret.name = path.slice(startPart, end);
                }
                else {
                    ret.name = path.slice(startPart, startDot);
                    ret.base = path.slice(startPart, end);
                    ret.ext = path.slice(startDot, end);
                }
            }
            // If the directory is the root, use the entire root as the `dir` including
            // the trailing slash if any (`C:\abc` -> `C:\`). Otherwise, strip out the
            // trailing slash (`C:\abc\def` -> `C:\abc`).
            if (startPart > 0 && startPart !== rootEnd) {
                ret.dir = path.slice(0, startPart - 1);
            }
            else {
                ret.dir = ret.root;
            }
            return ret;
        },
        sep: '\\',
        delimiter: ';',
        win32: null,
        posix: null
    };
    exports.posix = {
        // path.resolve([from ...], to)
        resolve(...pathSegments) {
            let resolvedPath = '';
            let resolvedAbsolute = false;
            for (let i = pathSegments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
                const path = i >= 0 ? pathSegments[i] : process.cwd();
                validateString(path, 'path');
                // Skip empty entries
                if (path.length === 0) {
                    continue;
                }
                resolvedPath = `${path}/${resolvedPath}`;
                resolvedAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
            }
            // 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 = normalizeString(resolvedPath, !resolvedAbsolute, '/', isPosixPathSeparator);
            if (resolvedAbsolute) {
                return `/${resolvedPath}`;
            }
            return resolvedPath.length > 0 ? resolvedPath : '.';
        },
        normalize(path) {
            validateString(path, 'path');
            if (path.length === 0) {
                return '.';
            }
            const isAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
            const trailingSeparator = path.charCodeAt(path.length - 1) === CHAR_FORWARD_SLASH;
            // Normalize the path
            path = normalizeString(path, !isAbsolute, '/', isPosixPathSeparator);
            if (path.length === 0) {
                if (isAbsolute) {
                    return '/';
                }
                return trailingSeparator ? './' : '.';
            }
            if (trailingSeparator) {
                path += '/';
            }
            return isAbsolute ? `/${path}` : path;
        },
        isAbsolute(path) {
            validateString(path, 'path');
            return path.length > 0 && path.charCodeAt(0) === CHAR_FORWARD_SLASH;
        },
        join(...paths) {
            if (paths.length === 0) {
                return '.';
            }
            let joined;
            for (let i = 0; i < paths.length; ++i) {
                const arg = paths[i];
                validateString(arg, 'path');
                if (arg.length > 0) {
                    if (joined === undefined) {
                        joined = arg;
                    }
                    else {
                        joined += `/${arg}`;
                    }
                }
            }
            if (joined === undefined) {
                return '.';
            }
            return exports.posix.normalize(joined);
        },
        relative(from, to) {
            validateString(from, 'from');
            validateString(to, 'to');
            if (from === to) {
                return '';
            }
            // Trim leading forward slashes.
            from = exports.posix.resolve(from);
            to = exports.posix.resolve(to);
            if (from === to) {
                return '';
            }
            const fromStart = 1;
            const fromEnd = from.length;
            const fromLen = fromEnd - fromStart;
            const toStart = 1;
            const toLen = to.length - toStart;
            // Compare paths to find the longest common path from root
            const length = (fromLen < toLen ? fromLen : toLen);
            let lastCommonSep = -1;
            let i = 0;
            for (; i < length; i++) {
                const fromCode = from.charCodeAt(fromStart + i);
                if (fromCode !== to.charCodeAt(toStart + i)) {
                    break;
                }
                else if (fromCode === CHAR_FORWARD_SLASH) {
                    lastCommonSep = i;
                }
            }
            if (i === length) {
                if (toLen > length) {
                    if (to.charCodeAt(toStart + i) === CHAR_FORWARD_SLASH) {
                        // We get here if `from` is the exact base path for `to`.
                        // For example: from='/foo/bar'; to='/foo/bar/baz'
                        return to.slice(toStart + i + 1);
                    }
                    if (i === 0) {
                        // We get here if `from` is the root
                        // For example: from='/'; to='/foo'
                        return to.slice(toStart + i);
                    }
                }
                else if (fromLen > length) {
                    if (from.charCodeAt(fromStart + i) === CHAR_FORWARD_SLASH) {
                        // We get here if `to` is the exact base path for `from`.
                        // For example: from='/foo/bar/baz'; to='/foo/bar'
                        lastCommonSep = i;
                    }
                    else if (i === 0) {
                        // We get here if `to` is the root.
                        // For example: from='/foo/bar'; to='/'
                        lastCommonSep = 0;
                    }
                }
            }
            let out = '';
            // Generate the relative path based on the path difference between `to`
            // and `from`.
            for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
                if (i === fromEnd || from.charCodeAt(i) === CHAR_FORWARD_SLASH) {
                    out += out.length === 0 ? '..' : '/..';
                }
            }
            // Lastly, append the rest of the destination (`to`) path that comes after
            // the common path parts.
            return `${out}${to.slice(toStart + lastCommonSep)}`;
        },
        toNamespacedPath(path) {
            // Non-op on posix systems
            return path;
        },
        dirname(path) {
            validateString(path, 'path');
            if (path.length === 0) {
                return '.';
            }
            const hasRoot = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
            let end = -1;
            let matchedSlash = true;
            for (let i = path.length - 1; i >= 1; --i) {
                if (path.charCodeAt(i) === CHAR_FORWARD_SLASH) {
                    if (!matchedSlash) {
                        end = i;
                        break;
                    }
                }
                else {
                    // We saw the first non-path separator
                    matchedSlash = false;
                }
            }
            if (end === -1) {
                return hasRoot ? '/' : '.';
            }
            if (hasRoot && end === 1) {
                return '//';
            }
            return path.slice(0, end);
        },
        basename(path, ext) {
            if (ext !== undefined) {
                validateString(ext, 'ext');
            }
            validateString(path, 'path');
            let start = 0;
            let end = -1;
            let matchedSlash = true;
            let i;
            if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
                if (ext === path) {
                    return '';
                }
                let extIdx = ext.length - 1;
                let firstNonSlashEnd = -1;
                for (i = path.length - 1; i >= 0; --i) {
                    const code = path.charCodeAt(i);
                    if (code === CHAR_FORWARD_SLASH) {
                        // If we reached a path separator that was not part of a set of path
                        // separators at the end of the string, stop now
                        if (!matchedSlash) {
                            start = i + 1;
                            break;
                        }
                    }
                    else {
                        if (firstNonSlashEnd === -1) {
                            // We saw the first non-path separator, remember this index in case
                            // we need it if the extension ends up not matching
                            matchedSlash = false;
                            firstNonSlashEnd = i + 1;
                        }
                        if (extIdx >= 0) {
                            // Try to match the explicit extension
                            if (code === ext.charCodeAt(extIdx)) {
                                if (--extIdx === -1) {
                                    // We matched the extension, so mark this as the end of our path
                                    // component
                                    end = i;
                                }
                            }
                            else {
                                // Extension does not match, so our result is the entire path
                                // component
                                extIdx = -1;
                                end = firstNonSlashEnd;
                            }
                        }
                    }
                }
                if (start === end) {
                    end = firstNonSlashEnd;
                }
                else if (end === -1) {
                    end = path.length;
                }
                return path.slice(start, end);
            }
            for (i = path.length - 1; i >= 0; --i) {
                if (path.charCodeAt(i) === CHAR_FORWARD_SLASH) {
                    // If we reached a path separator that was not part of a set of path
                    // separators at the end of the string, stop now
                    if (!matchedSlash) {
                        start = i + 1;
                        break;
                    }
                }
                else if (end === -1) {
                    // We saw the first non-path separator, mark this as the end of our
                    // path component
                    matchedSlash = false;
                    end = i + 1;
                }
            }
            if (end === -1) {
                return '';
            }
            return path.slice(start, end);
        },
        extname(path) {
            validateString(path, 'path');
            let startDot = -1;
            let startPart = 0;
            let end = -1;
            let matchedSlash = true;
            // Track the state of characters (if any) we see before our first dot and
            // after any path separator we find
            let preDotState = 0;
            for (let i = path.length - 1; i >= 0; --i) {
                const code = path.charCodeAt(i);
                if (code === CHAR_FORWARD_SLASH) {
                    // If we reached a path separator that was not part of a set of path
                    // separators at the end of the string, stop now
                    if (!matchedSlash) {
                        startPart = i + 1;
                        break;
                    }
                    continue;
                }
                if (end === -1) {
                    // We saw the first non-path separator, mark this as the end of our
                    // extension
                    matchedSlash = false;
                    end = i + 1;
                }
                if (code === CHAR_DOT) {
                    // If this is our first dot, mark it as the start of our extension
                    if (startDot === -1) {
                        startDot = i;
                    }
                    else if (preDotState !== 1) {
                        preDotState = 1;
                    }
                }
                else if (startDot !== -1) {
                    // We saw a non-dot and non-path separator before our dot, so we should
                    // have a good chance at having a non-empty extension
                    preDotState = -1;
                }
            }
            if (startDot === -1 ||
                end === -1 ||
                // We saw a non-dot character immediately before the dot
                preDotState === 0 ||
                // The (right-most) trimmed path component is exactly '..'
                (preDotState === 1 &&
                    startDot === end - 1 &&
                    startDot === startPart + 1)) {
                return '';
            }
            return path.slice(startDot, end);
        },
        format: _format.bind(null, '/'),
        parse(path) {
            validateString(path, 'path');
            const ret = { root: '', dir: '', base: '', ext: '', name: '' };
            if (path.length === 0) {
                return ret;
            }
            const isAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;
            let start;
            if (isAbsolute) {
                ret.root = '/';
                start = 1;
            }
            else {
                start = 0;
            }
            let startDot = -1;
            let startPart = 0;
            let end = -1;
            let matchedSlash = true;
            let i = path.length - 1;
            // Track the state of characters (if any) we see before our first dot and
            // after any path separator we find
            let preDotState = 0;
            // Get non-dir info
            for (; i >= start; --i) {
                const code = path.charCodeAt(i);
                if (code === CHAR_FORWARD_SLASH) {
                    // If we reached a path separator that was not part of a set of path
                    // separators at the end of the string, stop now
                    if (!matchedSlash) {
                        startPart = i + 1;
                        break;
                    }
                    continue;
                }
                if (end === -1) {
                    // We saw the first non-path separator, mark this as the end of our
                    // extension
                    matchedSlash = false;
                    end = i + 1;
                }
                if (code === CHAR_DOT) {
                    // If this is our first dot, mark it as the start of our extension
                    if (startDot === -1) {
                        startDot = i;
                    }
                    else if (preDotState !== 1) {
                        preDotState = 1;
                    }
                }
                else if (startDot !== -1) {
                    // We saw a non-dot and non-path separator before our dot, so we should
                    // have a good chance at having a non-empty extension
                    preDotState = -1;
                }
            }
            if (end !== -1) {
                const start = startPart === 0 && isAbsolute ? 1 : startPart;
                if (startDot === -1 ||
                    // We saw a non-dot character immediately before the dot
                    preDotState === 0 ||
                    // The (right-most) trimmed path component is exactly '..'
                    (preDotState === 1 &&
                        startDot === end - 1 &&
                        startDot === startPart + 1)) {
                    ret.base = ret.name = path.slice(start, end);
                }
                else {
                    ret.name = path.slice(start, startDot);
                    ret.base = path.slice(start, end);
                    ret.ext = path.slice(startDot, end);
                }
            }
            if (startPart > 0) {
                ret.dir = path.slice(0, startPart - 1);
            }
            else if (isAbsolute) {
                ret.dir = '/';
            }
            return ret;
        },
        sep: '/',
        delimiter: ':',
        win32: null,
        posix: null
    };
    exports.posix.win32 = exports.win32.win32 = exports.win32;
    exports.posix.posix = exports.win32.posix = exports.posix;
    exports.normalize = (process.platform === 'win32' ? exports.win32.normalize : exports.posix.normalize);
    exports.isAbsolute = (process.platform === 'win32' ? exports.win32.isAbsolute : exports.posix.isAbsolute);
    exports.join = (process.platform === 'win32' ? exports.win32.join : exports.posix.join);
    exports.resolve = (process.platform === 'win32' ? exports.win32.resolve : exports.posix.resolve);
    exports.relative = (process.platform === 'win32' ? exports.win32.relative : exports.posix.relative);
    exports.dirname = (process.platform === 'win32' ? exports.win32.dirname : exports.posix.dirname);
    exports.basename = (process.platform === 'win32' ? exports.win32.basename : exports.posix.basename);
    exports.extname = (process.platform === 'win32' ? exports.win32.extname : exports.posix.extname);
    exports.format = (process.platform === 'win32' ? exports.win32.format : exports.posix.format);
    exports.parse = (process.platform === 'win32' ? exports.win32.parse : exports.posix.parse);
    exports.toNamespacedPath = (process.platform === 'win32' ? exports.win32.toNamespacedPath : exports.posix.toNamespacedPath);
    exports.sep = (process.platform === 'win32' ? exports.win32.sep : exports.posix.sep);
    exports.delimiter = (process.platform === 'win32' ? exports.win32.delimiter : exports.posix.delimiter);
});
//# sourceMappingURL=path.js.map