SimpleVSC/src/helper/path.ts

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

"use strict";

// resolves . and .. elements in a path array with directory names there
// must be no slashes or device names (c:\) in the array
// (so also no leading and trailing slashes - it does not distinguish
// relative and absolute paths)
function normalizeArray(parts: string[], allowAboveRoot: boolean) {
   var res = [];
   for (var i = 0; i < parts.length; i++) {
      var p = parts[i];

      // ignore empty parts
      if (!p || p === ".") continue;

      if (p === "..") {
         if (res.length && res[res.length - 1] !== "..") {
            res.pop();
         } else if (allowAboveRoot) {
            res.push("..");
         }
      } else {
         res.push(p);
      }
   }

   return res;
}

// returns an array with empty elements removed from either end of the input
// array or the original array if no elements need to be removed
function trimArray(arr: any[]) {
   var lastIndex = arr.length - 1;
   var start = 0;
   for (; start <= lastIndex; start++) {
      if (arr[start]) break;
   }

   var end = lastIndex;
   for (; end >= 0; end--) {
      if (arr[end]) break;
   }

   if (start === 0 && end === lastIndex) return arr;
   if (start > end) return [];
   return arr.slice(start, end + 1);
}

// Split a filename into [root, dir, basename, ext], unix version
// 'root' is just a slash, or nothing.
const splitPathRe = /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;

function posixSplitPath(filename: string) {
   return splitPathRe.exec(filename)?.slice(1) as string[];
}

export class Posix {
   static readonly sep = "/";
   static readonly delimiter = ":";

   static resolve(...paths: string[]) {
      var resolvedPath = "",
         resolvedAbsolute = false;

      for (var i = paths.length - 1; i >= -1 && !resolvedAbsolute; i--) {
         var path = i >= 0 ? paths[i] : "/";

         // Skip empty and invalid entries
         if (typeof path !== "string") {
            throw new TypeError("Arguments to path.resolve must be strings");
         } else if (!path) {
            continue;
         }

         resolvedPath = path + "/" + resolvedPath;
         resolvedAbsolute = path[0] === "/";
      }

      // 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 = normalizeArray(resolvedPath.split("/"), !resolvedAbsolute).join("/");

      return (resolvedAbsolute ? "/" : "") + resolvedPath || ".";
   }

   static normalize(path: string) {
      var isAbsolute = Posix.isAbsolute(path),
         trailingSlash = path && path[path.length - 1] === "/";

      // Normalize the path
      path = normalizeArray(path.split("/"), !isAbsolute).join("/");

      if (!path && !isAbsolute) {
         path = ".";
      }
      if (path && trailingSlash) {
         path += "/";
      }

      return (isAbsolute ? "/" : "") + path;
   }

   static join(...paths: string[]) {
      var path = "";
      for (var i = 0; i < arguments.length; i++) {
         var segment = arguments[i];
         if (typeof segment !== "string") {
            throw new TypeError("Arguments to path.join must be strings");
         }
         if (segment) {
            if (!path) {
               path += segment;
            } else {
               path += "/" + segment;
            }
         }
      }
      return Posix.normalize(path);
   }

   static relative(from: string, to: string) {
      from = Posix.resolve(from).substr(1);
      to = Posix.resolve(to).substr(1);

      var fromParts = trimArray(from.split("/"));
      var toParts = trimArray(to.split("/"));

      var length = Math.min(fromParts.length, toParts.length);
      var samePartsLength = length;
      for (var i = 0; i < length; i++) {
         if (fromParts[i] !== toParts[i]) {
            samePartsLength = i;
            break;
         }
      }

      var outputParts = [];
      for (var i = samePartsLength; i < fromParts.length; i++) {
         outputParts.push("..");
      }

      outputParts = outputParts.concat(toParts.slice(samePartsLength));

      return outputParts.join("/");
   }

   static dirname(path: string) {
      var result = posixSplitPath(path) as string[],
         root = result[0],
         dir = result[1];

      if (!root && !dir) {
         // No dirname whatsoever
         return ".";
      }

      if (dir) {
         // It has a dirname, strip trailing slash
         dir = dir.substr(0, dir.length - 1);
      }

      return root + dir;
   }

   static basename(path: string, ext?: string) {
      var f = posixSplitPath(path)[2];
      // TODO: make this comparison case-insensitive on windows?
      if (ext && f.substr(-1 * ext.length) === ext) {
         f = f.substr(0, f.length - ext.length);
      }
      return f;
   }

   static extname(path: string) {
      return posixSplitPath(path)[3];
   }

   static format(pathObject: any) {
      if (typeof pathObject !== "object") {
         throw new TypeError("Parameter 'pathObject' must be an object, not " + typeof pathObject);
      }

      var root = pathObject.root || "";

      if (typeof root !== "string") {
         throw new TypeError(
            "'pathObject.root' must be a string or undefined, not " + typeof pathObject.root
         );
      }

      var dir = pathObject.dir ? pathObject.dir + Posix.sep : "";
      var base = pathObject.base || "";
      return dir + base;
   }

   static parse(pathString: string) {
      if (typeof pathString !== "string") {
         throw new TypeError("Parameter 'pathString' must be a string, not " + typeof pathString);
      }
      var allParts = posixSplitPath(pathString);
      if (!allParts || allParts.length !== 4) {
         throw new TypeError("Invalid path '" + pathString + "'");
      }
      allParts[1] = allParts[1] || "";
      allParts[2] = allParts[2] || "";
      allParts[3] = allParts[3] || "";

      return {
         root: allParts[0],
         dir: allParts[0] + allParts[1].slice(0, -1),
         base: allParts[2],
         ext: allParts[3],
         name: allParts[2].slice(0, allParts[2].length - allParts[3].length),
      };
   }

   static isAbsolute(path: string) {
      return path.charAt(0) === "/";
   }
}

export const Path = Posix;
export default Path;