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// Copyright 2018-2023 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_DOT,  CHAR_FORWARD_SLASH,  CHAR_LOWERCASE_A,  CHAR_LOWERCASE_Z,  CHAR_UPPERCASE_A,  CHAR_UPPERCASE_Z,} from "./_constants.ts";
export function assertPath(path: string) {  if (typeof path !== "string") {    throw new TypeError(      `Path must be a string. Received ${JSON.stringify(path)}`,    );  }}
export function isPosixPathSeparator(code: number): boolean {  return code === CHAR_FORWARD_SLASH;}
export function isPathSeparator(code: number): boolean {  return isPosixPathSeparator(code) || code === CHAR_BACKWARD_SLASH;}
export function isWindowsDeviceRoot(code: number): boolean {  return (    (code >= CHAR_LOWERCASE_A && code <= CHAR_LOWERCASE_Z) ||    (code >= CHAR_UPPERCASE_A && code <= CHAR_UPPERCASE_Z)  );}
// Resolves . and .. elements in a path with directory namesexport function normalizeString(  path: string,  allowAboveRoot: boolean,  separator: string,  isPathSeparator: (code: number) => boolean,): string {  let res = "";  let lastSegmentLength = 0;  let lastSlash = -1;  let dots = 0;  let code: number | undefined;  for (let i = 0, len = path.length; i <= len; ++i) {    if (i < len) code = path.charCodeAt(i);    else if (isPathSeparator(code!)) break;    else code = CHAR_FORWARD_SLASH;
    if (isPathSeparator(code!)) {      if (lastSlash === i - 1 || dots === 1) {        // NOOP      } else if (lastSlash !== i - 1 && dots === 2) {        if (          res.length < 2 ||          lastSegmentLength !== 2 ||          res.charCodeAt(res.length - 1) !== CHAR_DOT ||          res.charCodeAt(res.length - 2) !== CHAR_DOT        ) {          if (res.length > 2) {            const lastSlashIndex = res.lastIndexOf(separator);            if (lastSlashIndex === -1) {              res = "";              lastSegmentLength = 0;            } else {              res = res.slice(0, lastSlashIndex);              lastSegmentLength = res.length - 1 - res.lastIndexOf(separator);            }            lastSlash = i;            dots = 0;            continue;          } else if (res.length === 2 || res.length === 1) {            res = "";            lastSegmentLength = 0;            lastSlash = i;            dots = 0;            continue;          }        }        if (allowAboveRoot) {          if (res.length > 0) res += `${separator}..`;          else res = "..";          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;}
export function stripTrailingSeparators(  segment: string,  isSep: (char: number) => boolean,): string {  if (segment.length <= 1) {    return segment;  }
  let end = segment.length;
  for (let i = segment.length - 1; i > 0; i--) {    if (isSep(segment.charCodeAt(i))) {      end = i;    } else {      break;    }  }
  return segment.slice(0, end);}