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// Copyright the Browserify authors. MIT License.// Ported from https://github.com/browserify/path-browserify/// This module is browser compatible.
import type { FormatInputPathObject, ParsedPath } from "./_interface.ts";import { CHAR_DOT, CHAR_FORWARD_SLASH } from "./_constants.ts";
import {  _format,  assertPath,  encodeWhitespace,  isPosixPathSeparator,  normalizeString,} from "./_util.ts";
export const sep = "/";export const delimiter = ":";
// path.resolve([from ...], to)/** * Resolves `pathSegments` into an absolute path. * @param pathSegments an array of path segments */export function resolve(...pathSegments: string[]): string {  let resolvedPath = "";  let resolvedAbsolute = false;
  for (let i = pathSegments.length - 1; i >= -1 && !resolvedAbsolute; i--) {    let path: string;
    if (i >= 0) path = pathSegments[i];    else {      // deno-lint-ignore no-explicit-any      const { Deno } = globalThis as any;      if (typeof Deno?.cwd !== "function") {        throw new TypeError("Resolved a relative path without a CWD.");      }      path = Deno.cwd();    }
    assertPath(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) {    if (resolvedPath.length > 0) return `/${resolvedPath}`;    else return "/";  } else if (resolvedPath.length > 0) return resolvedPath;  else return ".";}
/** * Normalize the `path`, resolving `'..'` and `'.'` segments. * @param path to be normalized */export function normalize(path: string): string {  assertPath(path);
  if (path.length === 0) return ".";
  const isAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;  const trailingSeparator =    path.charCodeAt(path.length - 1) === CHAR_FORWARD_SLASH;
  // Normalize the path  path = normalizeString(path, !isAbsolute, "/", isPosixPathSeparator);
  if (path.length === 0 && !isAbsolute) path = ".";  if (path.length > 0 && trailingSeparator) path += "/";
  if (isAbsolute) return `/${path}`;  return path;}
/** * Verifies whether provided path is absolute * @param path to be verified as absolute */export function isAbsolute(path: string): boolean {  assertPath(path);  return path.length > 0 && path.charCodeAt(0) === CHAR_FORWARD_SLASH;}
/** * Join all given a sequence of `paths`,then normalizes the resulting path. * @param paths to be joined and normalized */export function join(...paths: string[]): string {  if (paths.length === 0) return ".";  let joined: string | undefined;  for (let i = 0, len = paths.length; i < len; ++i) {    const path = paths[i];    assertPath(path);    if (path.length > 0) {      if (!joined) joined = path;      else joined += `/${path}`;    }  }  if (!joined) return ".";  return normalize(joined);}
/** * Return the relative path from `from` to `to` based on current working directory. * @param from path in current working directory * @param to path in current working directory */export function relative(from: string, to: string): string {  assertPath(from);  assertPath(to);
  if (from === to) return "";
  from = resolve(from);  to = resolve(to);
  if (from === to) return "";
  // Trim any leading backslashes  let fromStart = 1;  const fromEnd = from.length;  for (; fromStart < fromEnd; ++fromStart) {    if (from.charCodeAt(fromStart) !== CHAR_FORWARD_SLASH) break;  }  const fromLen = fromEnd - fromStart;
  // Trim any leading backslashes  let toStart = 1;  const toEnd = to.length;  for (; toStart < toEnd; ++toStart) {    if (to.charCodeAt(toStart) !== CHAR_FORWARD_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_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);        } else 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'; to='/'          lastCommonSep = 0;        }      }      break;    }    const fromCode = from.charCodeAt(fromStart + i);    const toCode = to.charCodeAt(toStart + i);    if (fromCode !== toCode) break;    else if (fromCode === CHAR_FORWARD_SLASH) lastCommonSep = i;  }
  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) {      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 + to.slice(toStart + lastCommonSep);  else {    toStart += lastCommonSep;    if (to.charCodeAt(toStart) === CHAR_FORWARD_SLASH) ++toStart;    return to.slice(toStart);  }}
/** * Resolves path to a namespace path * @param path to resolve to namespace */export function toNamespacedPath(path: string): string {  // Non-op on posix systems  return path;}
/** * Return the directory name of a `path`. * @param path to determine name for */export function dirname(path: string): string {  assertPath(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);}
/** * 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: string, ext = ""): string {  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: number;
  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 >= 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);  } else {    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);  }}
/** * Return the extension of the `path`. * @param path with extension */export function extname(path: string): string {  assertPath(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);}
/** * Generate a path from `FormatInputPathObject` object. * @param pathObject with path */export function format(pathObject: FormatInputPathObject): string {  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: string): ParsedPath {  assertPath(path);
  const ret: ParsedPath = { root: "", dir: "", base: "", ext: "", name: "" };  if (path.length === 0) return ret;  const isAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH;  let start: number;  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 (    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) {      if (startPart === 0 && isAbsolute) {        ret.base = ret.name = path.slice(1, end);      } else {        ret.base = ret.name = path.slice(startPart, end);      }    }  } else {    if (startPart === 0 && isAbsolute) {      ret.name = path.slice(1, startDot);      ret.base = path.slice(1, end);    } else {      ret.name = path.slice(startPart, startDot);      ret.base = path.slice(startPart, end);    }    ret.ext = path.slice(startDot, end);  }
  if (startPart > 0) ret.dir = path.slice(0, startPart - 1);  else if (isAbsolute) ret.dir = "/";
  return ret;}
/** * Converts a file URL to a path string. * * ```ts *      import { fromFileUrl } from "./posix.ts"; *      fromFileUrl("file:///home/foo"); // "/home/foo" * ``` * @param url of a file URL */export function fromFileUrl(url: string | URL): string {  url = url instanceof URL ? url : new URL(url);  if (url.protocol != "file:") {    throw new TypeError("Must be a file URL.");  }  return decodeURIComponent(    url.pathname.replace(/%(?![0-9A-Fa-f]{2})/g, "%25"),  );}
/** * Converts a path string to a file URL. * * ```ts *      import { toFileUrl } from "./posix.ts"; *      toFileUrl("/home/foo"); // new URL("file:///home/foo") * ``` * @param path to convert to file URL */export function toFileUrl(path: string): URL {  if (!isAbsolute(path)) {    throw new TypeError("Must be an absolute path.");  }  const url = new URL("file:///");  url.pathname = encodeWhitespace(    path.replace(/%/g, "%25").replace(/\\/g, "%5C"),  );  return url;}