38 lines
1.3 KiB
TypeScript
38 lines
1.3 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 {
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assertArgs,
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lastPathSegment,
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stripSuffix,
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} from "./../_common/basename.ts";
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import { CHAR_COLON } from "./../_common/constants.ts";
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import { stripTrailingSeparators } from "./../_common/strip_trailing_separators.ts";
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import { isPathSeparator, isWindowsDeviceRoot } from "./_util.ts";
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/**
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* Return the last portion of a `path`.
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* Trailing directory separators are ignored, and optional suffix is removed.
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*
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* @param path - path to extract the name from.
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* @param [suffix] - suffix to remove from extracted name.
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*/
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export function basename(path: string, suffix = ""): string {
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assertArgs(path, suffix);
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// Check for a drive letter prefix so as not to mistake the following
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// path separator as an extra separator at the end of the path that can be
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// disregarded
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let start = 0;
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if (path.length >= 2) {
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const drive = path.charCodeAt(0);
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if (isWindowsDeviceRoot(drive)) {
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if (path.charCodeAt(1) === CHAR_COLON) start = 2;
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}
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}
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const lastSegment = lastPathSegment(path, isPathSeparator, start);
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const strippedSegment = stripTrailingSeparators(lastSegment, isPathSeparator);
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return suffix ? stripSuffix(strippedSegment, suffix) : strippedSegment;
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}
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