// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
// Copyright the Browserify authors. MIT License.
// Ported from https://github.com/browserify/path-browserify/
// This module is browser compatible.
import { CHAR_BACKWARD_SLASH, CHAR_COLON, CHAR_DOT, CHAR_QUESTION_MARK } from "./_constants.ts";
import { _format, assertPath, encodeWhitespace, isPathSeparator, isWindowsDeviceRoot, normalizeString } from "./_util.ts";
import { assert } from "../_util/asserts.ts";
export const sep = "\\";
export const delimiter = ";";
/**
 * Resolves path segments into a `path`
 * @param pathSegments to process to path
 */ export function resolve(...pathSegments) {
    let resolvedDevice = "";
    let resolvedTail = "";
    let resolvedAbsolute = false;
    for(let i = pathSegments.length - 1; i >= -1; i--){
        let path;
        // deno-lint-ignore no-explicit-any
        const { Deno  } = globalThis;
        if (i >= 0) {
            path = pathSegments[i];
        } else if (!resolvedDevice) {
            if (typeof Deno?.cwd !== "function") {
                throw new TypeError("Resolved a drive-letter-less path without a CWD.");
            }
            path = Deno.cwd();
        } else {
            if (typeof Deno?.env?.get !== "function" || typeof Deno?.cwd !== "function") {
                throw new TypeError("Resolved a relative path without a CWD.");
            }
            path = Deno.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, 3).toLowerCase() !== `${resolvedDevice.toLowerCase()}\\`) {
                path = `${resolvedDevice}\\`;
            }
        }
        assertPath(path);
        const len = path.length;
        // Skip empty entries
        if (len === 0) continue;
        let rootEnd = 0;
        let device = "";
        let isAbsolute = false;
        const code = path.charCodeAt(0);
        // Try to match a root
        if (len > 1) {
            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
                    for(; j < len; ++j){
                        if (isPathSeparator(path.charCodeAt(j))) break;
                    }
                    if (j < len && j !== last) {
                        const firstPart = path.slice(last, j);
                        // Matched!
                        last = j;
                        // Match 1 or more path separators
                        for(; j < len; ++j){
                            if (!isPathSeparator(path.charCodeAt(j))) break;
                        }
                        if (j < len && j !== last) {
                            // Matched!
                            last = j;
                            // Match 1 or more non-path separators
                            for(; j < len; ++j){
                                if (isPathSeparator(path.charCodeAt(j))) break;
                            }
                            if (j === len) {
                                // We matched a UNC root only
                                device = `\\\\${firstPart}\\${path.slice(last)}`;
                                rootEnd = j;
                            } else 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)) {
                // Possible device root
                if (path.charCodeAt(1) === CHAR_COLON) {
                    device = path.slice(0, 2);
                    rootEnd = 2;
                    if (len > 2) {
                        if (isPathSeparator(path.charCodeAt(2))) {
                            // Treat separator following drive name as an absolute path
                            // indicator
                            isAbsolute = true;
                            rootEnd = 3;
                        }
                    }
                }
            }
        } else if (isPathSeparator(code)) {
            // `path` contains just a path separator
            rootEnd = 1;
            isAbsolute = true;
        }
        if (device.length > 0 && resolvedDevice.length > 0 && device.toLowerCase() !== resolvedDevice.toLowerCase()) {
            continue;
        }
        if (resolvedDevice.length === 0 && device.length > 0) {
            resolvedDevice = device;
        }
        if (!resolvedAbsolute) {
            resolvedTail = `${path.slice(rootEnd)}\\${resolvedTail}`;
            resolvedAbsolute = isAbsolute;
        }
        if (resolvedAbsolute && 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 resolvedDevice + (resolvedAbsolute ? "\\" : "") + resolvedTail || ".";
}
/**
 * Normalizes a `path`
 * @param path to normalize
 */ export function normalize(path) {
    assertPath(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) {
        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
                for(; j < len; ++j){
                    if (isPathSeparator(path.charCodeAt(j))) break;
                }
                if (j < len && j !== last) {
                    const firstPart = path.slice(last, j);
                    // Matched!
                    last = j;
                    // Match 1 or more path separators
                    for(; j < len; ++j){
                        if (!isPathSeparator(path.charCodeAt(j))) break;
                    }
                    if (j < len && j !== last) {
                        // Matched!
                        last = j;
                        // Match 1 or more non-path separators
                        for(; j < len; ++j){
                            if (isPathSeparator(path.charCodeAt(j))) break;
                        }
                        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)}\\`;
                        } else 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)) {
            // Possible device root
            if (path.charCodeAt(1) === CHAR_COLON) {
                device = path.slice(0, 2);
                rootEnd = 2;
                if (len > 2) {
                    if (isPathSeparator(path.charCodeAt(2))) {
                        // Treat separator following drive name as an absolute path
                        // indicator
                        isAbsolute = true;
                        rootEnd = 3;
                    }
                }
            }
        }
    } else if (isPathSeparator(code)) {
        // `path` contains just a path separator, exit early to avoid unnecessary
        // work
        return "\\";
    }
    let tail;
    if (rootEnd < len) {
        tail = normalizeString(path.slice(rootEnd), !isAbsolute, "\\", isPathSeparator);
    } else {
        tail = "";
    }
    if (tail.length === 0 && !isAbsolute) tail = ".";
    if (tail.length > 0 && isPathSeparator(path.charCodeAt(len - 1))) {
        tail += "\\";
    }
    if (device === undefined) {
        if (isAbsolute) {
            if (tail.length > 0) return `\\${tail}`;
            else return "\\";
        } else if (tail.length > 0) {
            return tail;
        } else {
            return "";
        }
    } else if (isAbsolute) {
        if (tail.length > 0) return `${device}\\${tail}`;
        else return `${device}\\`;
    } else if (tail.length > 0) {
        return device + tail;
    } else {
        return device;
    }
}
/**
 * Verifies whether path is absolute
 * @param path to verify
 */ export function isAbsolute(path) {
    assertPath(path);
    const len = path.length;
    if (len === 0) return false;
    const code = path.charCodeAt(0);
    if (isPathSeparator(code)) {
        return true;
    } else if (isWindowsDeviceRoot(code)) {
        // Possible device root
        if (len > 2 && path.charCodeAt(1) === CHAR_COLON) {
            if (isPathSeparator(path.charCodeAt(2))) return true;
        }
    }
    return false;
}
/**
 * Join all given a sequence of `paths`,then normalizes the resulting path.
 * @param paths to be joined and normalized
 */ export function join(...paths) {
    const pathsCount = paths.length;
    if (pathsCount === 0) return ".";
    let joined;
    let firstPart = null;
    for(let i = 0; i < pathsCount; ++i){
        const path = paths[i];
        assertPath(path);
        if (path.length > 0) {
            if (joined === undefined) joined = firstPart = path;
            else joined += `\\${path}`;
        }
    }
    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;
    assert(firstPart != null);
    if (isPathSeparator(firstPart.charCodeAt(0))) {
        ++slashCount;
        const firstLen = firstPart.length;
        if (firstLen > 1) {
            if (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
        for(; slashCount < joined.length; ++slashCount){
            if (!isPathSeparator(joined.charCodeAt(slashCount))) break;
        }
        // Replace the slashes if needed
        if (slashCount >= 2) joined = `\\${joined.slice(slashCount)}`;
    }
    return 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'
 * @param from relative path
 * @param to relative path
 */ export function relative(from, to) {
    assertPath(from);
    assertPath(to);
    if (from === to) return "";
    const fromOrig = resolve(from);
    const toOrig = resolve(to);
    if (fromOrig === toOrig) return "";
    from = fromOrig.toLowerCase();
    to = toOrig.toLowerCase();
    if (from === to) return "";
    // Trim any leading backslashes
    let fromStart = 0;
    let fromEnd = from.length;
    for(; fromStart < fromEnd; ++fromStart){
        if (from.charCodeAt(fromStart) !== CHAR_BACKWARD_SLASH) break;
    }
    // Trim trailing backslashes (applicable to UNC paths only)
    for(; fromEnd - 1 > fromStart; --fromEnd){
        if (from.charCodeAt(fromEnd - 1) !== CHAR_BACKWARD_SLASH) break;
    }
    const fromLen = fromEnd - fromStart;
    // Trim any leading backslashes
    let toStart = 0;
    let toEnd = to.length;
    for(; toStart < toEnd; ++toStart){
        if (to.charCodeAt(toStart) !== CHAR_BACKWARD_SLASH) break;
    }
    // Trim trailing backslashes (applicable to UNC paths only)
    for(; toEnd - 1 > toStart; --toEnd){
        if (to.charCodeAt(toEnd - 1) !== CHAR_BACKWARD_SLASH) break;
    }
    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){
        if (i === length) {
            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);
                } else 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;
                }
            }
            break;
        }
        const fromCode = from.charCodeAt(fromStart + i);
        const toCode = to.charCodeAt(toStart + i);
        if (fromCode !== toCode) 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 && lastCommonSep === -1) {
        return toOrig;
    }
    let out = "";
    if (lastCommonSep === -1) lastCommonSep = 0;
    // 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) {
            if (out.length === 0) out += "..";
            else out += "\\..";
        }
    }
    // 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 + lastCommonSep, toEnd);
    } else {
        toStart += lastCommonSep;
        if (toOrig.charCodeAt(toStart) === CHAR_BACKWARD_SLASH) ++toStart;
        return toOrig.slice(toStart, toEnd);
    }
}
/**
 * Resolves path to a namespace path
 * @param path to resolve to namespace
 */ export function toNamespacedPath(path) {
    // Note: this will *probably* throw somewhere.
    if (typeof path !== "string") return path;
    if (path.length === 0) return "";
    const resolvedPath = resolve(path);
    if (resolvedPath.length >= 3) {
        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))) {
            // Possible device root
            if (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;
}
/**
 * Return the directory path of a `path`.
 * @param path to determine the directory path for
 */ export function dirname(path) {
    assertPath(path);
    const len = path.length;
    if (len === 0) return ".";
    let rootEnd = -1;
    let end = -1;
    let matchedSlash = true;
    let offset = 0;
    const code = path.charCodeAt(0);
    // Try to match a root
    if (len > 1) {
        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
                for(; j < len; ++j){
                    if (isPathSeparator(path.charCodeAt(j))) break;
                }
                if (j < len && j !== last) {
                    // Matched!
                    last = j;
                    // Match 1 or more path separators
                    for(; j < len; ++j){
                        if (!isPathSeparator(path.charCodeAt(j))) break;
                    }
                    if (j < len && j !== last) {
                        // Matched!
                        last = j;
                        // Match 1 or more non-path separators
                        for(; j < len; ++j){
                            if (isPathSeparator(path.charCodeAt(j))) break;
                        }
                        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;
                        }
                    }
                }
            }
        } else if (isWindowsDeviceRoot(code)) {
            // Possible device root
            if (path.charCodeAt(1) === CHAR_COLON) {
                rootEnd = offset = 2;
                if (len > 2) {
                    if (isPathSeparator(path.charCodeAt(2))) rootEnd = offset = 3;
                }
            }
        }
    } else if (isPathSeparator(code)) {
        // `path` contains just a path separator, exit early to avoid
        // unnecessary work
        return path;
    }
    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 ".";
        else end = rootEnd;
    }
    return path.slice(0, end);
}
/**
 * Return the last portion of a `path`. Trailing directory separators are ignored.
 * @param path to process
 * @param ext of path directory
 */ export function basename(path, ext = "") {
    if (ext !== undefined && typeof ext !== "string") {
        throw new TypeError('"ext" argument must be a string');
    }
    assertPath(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) {
        const drive = path.charCodeAt(0);
        if (isWindowsDeviceRoot(drive)) {
            if (path.charCodeAt(1) === CHAR_COLON) start = 2;
        }
    }
    if (ext !== undefined && ext.length > 0 && ext.length <= path.length) {
        if (ext.length === path.length && 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);
    } else {
        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);
    }
}
/**
 * Return the extension of the `path` with leading period.
 * @param path with extension
 * @returns extension (ex. for `file.ts` returns `.ts`)
 */ export function extname(path) {
    assertPath(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);
}
/**
 * Generate a path from `FormatInputPathObject` object.
 * @param pathObject with path
 */ export function format(pathObject) {
    if (pathObject === null || typeof pathObject !== "object") {
        throw new TypeError(`The "pathObject" argument must be of type Object. Received type ${typeof pathObject}`);
    }
    return _format("\\", pathObject);
}
/**
 * Return a `ParsedPath` object of the `path`.
 * @param path to process
 */ export function parse(path) {
    assertPath(path);
    const ret = {
        root: "",
        dir: "",
        base: "",
        ext: "",
        name: ""
    };
    const len = path.length;
    if (len === 0) return ret;
    let rootEnd = 0;
    let code = path.charCodeAt(0);
    // Try to match a root
    if (len > 1) {
        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
                for(; j < len; ++j){
                    if (isPathSeparator(path.charCodeAt(j))) break;
                }
                if (j < len && j !== last) {
                    // Matched!
                    last = j;
                    // Match 1 or more path separators
                    for(; j < len; ++j){
                        if (!isPathSeparator(path.charCodeAt(j))) break;
                    }
                    if (j < len && j !== last) {
                        // Matched!
                        last = j;
                        // Match 1 or more non-path separators
                        for(; j < len; ++j){
                            if (isPathSeparator(path.charCodeAt(j))) break;
                        }
                        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)) {
            // Possible device root
            if (path.charCodeAt(1) === CHAR_COLON) {
                rootEnd = 2;
                if (len > 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;
                    }
                } else {
                    // `path` contains just a drive root, exit early to avoid
                    // unnecessary work
                    ret.root = ret.dir = path;
                    return ret;
                }
            }
        }
    } else if (isPathSeparator(code)) {
        // `path` contains just a path separator, exit early to avoid
        // unnecessary work
        ret.root = ret.dir = path;
        return ret;
    }
    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 (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) {
        if (end !== -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;
}
/**
 * Converts a file URL to a path string.
 *
 * ```ts
 *      import { fromFileUrl } from "https://deno.land/std@$STD_VERSION/path/win32.ts";
 *      fromFileUrl("file:///home/foo"); // "\\home\\foo"
 *      fromFileUrl("file:///C:/Users/foo"); // "C:\\Users\\foo"
 *      fromFileUrl("file://localhost/home/foo"); // "\\\\localhost\\home\\foo"
 * ```
 * @param url of a file URL
 */ export function fromFileUrl(url) {
    url = url instanceof URL ? url : new URL(url);
    if (url.protocol != "file:") {
        throw new TypeError("Must be a file URL.");
    }
    let path = decodeURIComponent(url.pathname.replace(/\//g, "\\").replace(/%(?![0-9A-Fa-f]{2})/g, "%25")).replace(/^\\*([A-Za-z]:)(\\|$)/, "$1\\");
    if (url.hostname != "") {
        // Note: The `URL` implementation guarantees that the drive letter and
        // hostname are mutually exclusive. Otherwise it would not have been valid
        // to append the hostname and path like this.
        path = `\\\\${url.hostname}${path}`;
    }
    return path;
}
/**
 * Converts a path string to a file URL.
 *
 * ```ts
 *      import { toFileUrl } from "https://deno.land/std@$STD_VERSION/path/win32.ts";
 *      toFileUrl("\\home\\foo"); // new URL("file:///home/foo")
 *      toFileUrl("C:\\Users\\foo"); // new URL("file:///C:/Users/foo")
 *      toFileUrl("\\\\127.0.0.1\\home\\foo"); // new URL("file://127.0.0.1/home/foo")
 * ```
 * @param path to convert to file URL
 */ export function toFileUrl(path) {
    if (!isAbsolute(path)) {
        throw new TypeError("Must be an absolute path.");
    }
    const [, hostname, pathname] = path.match(/^(?:[/\\]{2}([^/\\]+)(?=[/\\](?:[^/\\]|$)))?(.*)/);
    const url = new URL("file:///");
    url.pathname = encodeWhitespace(pathname.replace(/%/g, "%25"));
    if (hostname != null && hostname != "localhost") {
        url.hostname = hostname;
        if (!url.hostname) {
            throw new TypeError("Invalid hostname.");
        }
    }
    return url;
}
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