@oazmi/build-tools
Version:
general deno build tool scripts which I practically use in all of my typescript repos
84 lines (83 loc) • 3 kB
JavaScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
import { assert } from "../../../assert/0.226.0/assert.js";
import { assertPath } from "../_common/assert_path.js";
import { isPathSeparator } from "./_util.js";
import { normalize } from "./normalize.js";
/**
* Join all given a sequence of `paths`,then normalizes the resulting path.
*
* @example Usage
* ```ts
* import { join } from "@std/path/windows/join";
* import { assertEquals } from "@std/assert/assert-equals";
*
* const joined = join("C:\\foo", "bar", "baz\\..");
* assertEquals(joined, "C:\\foo\\bar");
* ```
*
* @param paths The paths to join.
* @returns The joined path.
*/
export function join(...paths) {
if (paths.length === 0)
return ".";
let joined;
let firstPart = null;
for (let i = 0; i < paths.length; ++i) {
const path = paths[i];
assertPath(path);
if (path.length > 0) {
if (joined === undefined)
joined = firstPart = path;
else
joined += `\\${path}`;
}
}
if (joined === undefined)
return ".";
// Make sure that the joined path doesn't start with two slashes, because
// normalize() will mistake it for an UNC path then.
//
// This step is skipped when it is very clear that the user actually
// intended to point at an UNC path. This is assumed when the first
// non-empty string arguments starts with exactly two slashes followed by
// at least one more non-slash character.
//
// Note that for normalize() to treat a path as an UNC path it needs to
// have at least 2 components, so we don't filter for that here.
// This means that the user can use join to construct UNC paths from
// a server name and a share name; for example:
// path.join('//server', 'share') -> '\\\\server\\share\\')
let needsReplace = true;
let slashCount = 0;
assert(firstPart !== null);
if (isPathSeparator(firstPart.charCodeAt(0))) {
++slashCount;
const firstLen = firstPart.length;
if (firstLen > 1) {
if (isPathSeparator(firstPart.charCodeAt(1))) {
++slashCount;
if (firstLen > 2) {
if (isPathSeparator(firstPart.charCodeAt(2)))
++slashCount;
else {
// We matched a UNC path in the first part
needsReplace = false;
}
}
}
}
}
if (needsReplace) {
// Find any more consecutive slashes we need to replace
for (; slashCount < joined.length; ++slashCount) {
if (!isPathSeparator(joined.charCodeAt(slashCount)))
break;
}
// Replace the slashes if needed
if (slashCount >= 2)
joined = `\\${joined.slice(slashCount)}`;
}
return normalize(joined);
}