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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
import { CHAR_COLON } from "./_constants.ts";import {  assertPath,  isPathSeparator,  isPosixPathSeparator,  isWindowsDeviceRoot,  stripTrailingSeparators,} from "./_util.ts";
function stripSuffix(name: string, suffix: string): string {  if (suffix.length >= name.length) {    return name;  }
  const lenDiff = name.length - suffix.length;
  for (let i = suffix.length - 1; i >= 0; --i) {    if (name.charCodeAt(lenDiff + i) !== suffix.charCodeAt(i)) {      return name;    }  }
  return name.slice(0, -suffix.length);}
function lastPathSegment(  path: string,  isSep: (char: number) => boolean,  start = 0,): string {  let matchedNonSeparator = false;  let end = path.length;
  for (let i = path.length - 1; i >= start; --i) {    if (isSep(path.charCodeAt(i))) {      if (matchedNonSeparator) {        start = i + 1;        break;      }    } else if (!matchedNonSeparator) {      matchedNonSeparator = true;      end = i + 1;    }  }
  return path.slice(start, end);}
function assertArgs(path: string, suffix: string) {  assertPath(path);  if (path.length === 0) return path;  if (typeof suffix !== "string") {    throw new TypeError(      `Suffix must be a string. Received ${JSON.stringify(suffix)}`,    );  }}
/** * Return the last portion of a `path`. * Trailing directory separators are ignored, and optional suffix is removed. * * @param path - path to extract the name from. * @param [suffix] - suffix to remove from extracted name. */export function posixBasename(path: string, suffix = ""): string {  assertArgs(path, suffix);
  const lastSegment = lastPathSegment(path, isPosixPathSeparator);  const strippedSegment = stripTrailingSeparators(    lastSegment,    isPosixPathSeparator,  );  return suffix ? stripSuffix(strippedSegment, suffix) : strippedSegment;}
/** * Return the last portion of a `path`. * Trailing directory separators are ignored, and optional suffix is removed. * * @param path - path to extract the name from. * @param [suffix] - suffix to remove from extracted name. */export function windowsBasename(path: string, suffix = ""): string {  assertArgs(path, suffix);
  // 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  let start = 0;  if (path.length >= 2) {    const drive = path.charCodeAt(0);    if (isWindowsDeviceRoot(drive)) {      if (path.charCodeAt(1) === CHAR_COLON) start = 2;    }  }
  const lastSegment = lastPathSegment(path, isPathSeparator, start);  const strippedSegment = stripTrailingSeparators(lastSegment, isPathSeparator);  return suffix ? stripSuffix(strippedSegment, suffix) : strippedSegment;}