// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
import { CHAR_COLON, CHAR_DOT } from "../_common/constants.ts";
import { assertPath } from "../_common/assert_path.ts";
import { isPathSeparator, isWindowsDeviceRoot } from "./_util.ts";
/**
 * 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;
              ret.base = "\\";
              return ret;
            }
            rootEnd = 3;
          }
        } else {
          // `path` contains just a relative 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;
    ret.base = "\\";
    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);
  }
  // Fallback to '\' in case there is no basename
  ret.base = ret.base || "\\";
  // 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;
}
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