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denoland-deno/tests/registry/jsr/@std/path/0.220.1/posix/normalize.ts

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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
import { assertArg } from "../_common/normalize.ts";
import { normalizeString } from "../_common/normalize_string.ts";
import { isPosixPathSeparator } from "./_util.ts";
/**
* Normalize the `path`, resolving `'..'` and `'.'` segments.
* Note that resolving these segments does not necessarily mean that all will be eliminated.
* A `'..'` at the top-level will be preserved, and an empty path is canonically `'.'`.
* @param path to be normalized
*/
export function normalize(path: string): string {
assertArg(path);
const isAbsolute = isPosixPathSeparator(path.charCodeAt(0));
const trailingSeparator = isPosixPathSeparator(
path.charCodeAt(path.length - 1),
);
// 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;
}