// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
import { assertArg } from "../_common/dirname.js";
import { stripTrailingSeparators } from "../_common/strip_trailing_separators.js";
import { isPosixPathSeparator } from "./_util.js";
/**
 * Return the directory path of a `path`.
 *
 * @example Usage
 * ```ts
 * import { dirname } from "@std/path/posix/dirname";
 * import { assertEquals } from "@std/assert";
 *
 * assertEquals(dirname("/home/user/Documents/"), "/home/user");
 * assertEquals(dirname("/home/user/Documents/image.png"), "/home/user/Documents");
 * assertEquals(dirname("https://deno.land/std/path/mod.ts"), "https://deno.land/std/path");
 * ```
 *
 * @example Working with URLs
 *
 * ```ts
 * import { dirname } from "@std/path/posix/dirname";
 * import { assertEquals } from "@std/assert";
 *
 * assertEquals(dirname("https://deno.land/std/path/mod.ts"), "https://deno.land/std/path");
 * assertEquals(dirname("https://deno.land/std/path/mod.ts?a=b"), "https://deno.land/std/path");
 * assertEquals(dirname("https://deno.land/std/path/mod.ts#header"), "https://deno.land/std/path");
 * ```
 *
 * Note: If you are working with file URLs,
 * use the new version of `dirname` from `@std/path/posix/unstable-dirname`.
 *
 * @param path The path to get the directory from.
 * @returns The directory path.
 */
export function dirname(path) {
    assertArg(path);
    let end = -1;
    let matchedNonSeparator = false;
    for (let i = path.length - 1; i >= 1; --i) {
        if (isPosixPathSeparator(path.charCodeAt(i))) {
            if (matchedNonSeparator) {
                end = i;
                break;
            }
        }
        else {
            matchedNonSeparator = true;
        }
    }
    // No matches. Fallback based on provided path:
    //
    // - leading slashes paths
    //     "/foo" => "/"
    //     "///foo" => "/"
    // - no slash path
    //     "foo" => "."
    if (end === -1) {
        return isPosixPathSeparator(path.charCodeAt(0)) ? "/" : ".";
    }
    return stripTrailingSeparators(path.slice(0, end), isPosixPathSeparator);
}
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