45 lines
1.1 KiB
TypeScript
45 lines
1.1 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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import { assertArg } from "./../_common/dirname.ts";
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import { stripTrailingSeparators } from "./../_common/strip_trailing_separators.ts";
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import { isPosixPathSeparator } from "./_util.ts";
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/**
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* Return the directory path of a `path`.
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* @param path - path to extract the directory from.
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*/
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export function dirname(path: string): string {
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assertArg(path);
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let end = -1;
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let matchedNonSeparator = false;
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for (let i = path.length - 1; i >= 1; --i) {
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if (isPosixPathSeparator(path.charCodeAt(i))) {
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if (matchedNonSeparator) {
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end = i;
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break;
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}
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} else {
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matchedNonSeparator = true;
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}
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}
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// No matches. Fallback based on provided path:
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//
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// - leading slashes paths
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// "/foo" => "/"
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// "///foo" => "/"
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// - no slash path
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// "foo" => "."
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if (end === -1) {
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return isPosixPathSeparator(path.charCodeAt(0)) ? "/" : ".";
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}
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return stripTrailingSeparators(
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path.slice(0, end),
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isPosixPathSeparator,
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);
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}
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