73 lines
2.4 KiB
TypeScript
73 lines
2.4 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 { assert } from "jsr:/@std/assert@^0.217.0/assert";
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import { assertPath } from "./../_common/assert_path.ts";
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import { isPathSeparator } from "./_util.ts";
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import { normalize } from "./normalize.ts";
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/**
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* Join all given a sequence of `paths`,then normalizes the resulting path.
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* @param paths to be joined and normalized
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*/
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export function join(...paths: string[]): string {
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if (paths.length === 0) return ".";
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let joined: string | undefined;
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let firstPart: string | null = null;
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for (let i = 0; i < paths.length; ++i) {
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const path = paths[i]!;
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assertPath(path);
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if (path.length > 0) {
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if (joined === undefined) joined = firstPart = path;
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else joined += `\\${path}`;
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}
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}
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if (joined === undefined) return ".";
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// Make sure that the joined path doesn't start with two slashes, because
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// normalize() will mistake it for an UNC path then.
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//
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// This step is skipped when it is very clear that the user actually
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// intended to point at an UNC path. This is assumed when the first
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// non-empty string arguments starts with exactly two slashes followed by
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// at least one more non-slash character.
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//
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// Note that for normalize() to treat a path as an UNC path it needs to
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// have at least 2 components, so we don't filter for that here.
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// This means that the user can use join to construct UNC paths from
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// a server name and a share name; for example:
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// path.join('//server', 'share') -> '\\\\server\\share\\')
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let needsReplace = true;
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let slashCount = 0;
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assert(firstPart !== null);
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if (isPathSeparator(firstPart.charCodeAt(0))) {
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++slashCount;
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const firstLen = firstPart.length;
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if (firstLen > 1) {
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if (isPathSeparator(firstPart.charCodeAt(1))) {
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++slashCount;
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if (firstLen > 2) {
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if (isPathSeparator(firstPart.charCodeAt(2))) ++slashCount;
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else {
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// We matched a UNC path in the first part
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needsReplace = false;
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}
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}
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}
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}
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}
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if (needsReplace) {
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// Find any more consecutive slashes we need to replace
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for (; slashCount < joined.length; ++slashCount) {
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if (!isPathSeparator(joined.charCodeAt(slashCount))) break;
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}
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// Replace the slashes if needed
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if (slashCount >= 2) joined = `\\${joined.slice(slashCount)}`;
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}
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return normalize(joined);
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}
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