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73 lines
1.9 KiB
TypeScript
73 lines
1.9 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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/** End-of-line character for POSIX platforms such as macOS and Linux. */
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export const LF = "\n" as const;
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/** End-of-line character for Windows platforms. */
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export const CRLF = "\r\n" as const;
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/**
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* End-of-line character evaluated for the current platform.
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*
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* @example Usage
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* ```ts ignore
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* import { EOL } from "@std/fs/eol";
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*
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* EOL; // "\n" on POSIX platforms and "\r\n" on Windows
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* ```
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*/
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export const EOL: "\n" | "\r\n" =
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// deno-lint-ignore no-explicit-any
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(globalThis as any).Deno?.build.os === "windows" ? CRLF : LF;
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const regDetect = /(?:\r?\n)/g;
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/**
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* Returns the detected EOL character(s) detected in the input string. If no EOL
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* character is detected, `null` is returned.
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*
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* @param content The input string to detect EOL characters.
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*
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* @returns The detected EOL character(s) or `null` if no EOL character is detected.
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*
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* @example Usage
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* ```ts ignore
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* import { detect } from "@std/fs/eol";
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*
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* detect("deno\r\nis not\r\nnode"); // "\r\n"
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* detect("deno\nis not\r\nnode"); // "\r\n"
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* detect("deno\nis not\nnode"); // "\n"
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* detect("deno is not node"); // null
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* ```
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*/
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export function detect(content: string): typeof EOL | null {
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const d = content.match(regDetect);
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if (!d || d.length === 0) {
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return null;
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}
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const hasCRLF = d.some((x: string): boolean => x === CRLF);
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return hasCRLF ? CRLF : LF;
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}
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/**
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* Normalize the input string to the targeted EOL.
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*
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* @param content The input string to normalize.
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* @param eol The EOL character(s) to normalize the input string to.
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*
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* @returns The input string normalized to the targeted EOL.
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*
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* @example Usage
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* ```ts ignore
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* import { LF, format } from "@std/fs/eol";
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*
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* const CRLFinput = "deno\r\nis not\r\nnode";
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*
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* format(CRLFinput, LF); // "deno\nis not\nnode"
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* ```
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*/
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export function format(content: string, eol: typeof EOL): string {
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return content.replace(regDetect, eol);
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}
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