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eol.ts
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eol.ts
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
/** Platform-specific conventions for the line ending format (i.e., the "end-of-line"). */
export enum EOL {
/** Line Feed. Typically used in Unix (and Unix-like) systems. */
LF = "\n",
/** Carriage Return + Line Feed. Historically used in Windows and early DOS systems. */
CRLF = "\r\n",
}
const regDetect = /(?:\r?\n)/g;
/**
* Detect the EOL character for string input.
* returns null if no newline.
*
* @example
* ```ts
* import { detect, EOL } from "https://deno.land/std@$STD_VERSION/fs/mod.ts";
*
* const CRLFinput = "deno\r\nis not\r\nnode";
* const Mixedinput = "deno\nis not\r\nnode";
* const LFinput = "deno\nis not\nnode";
* const NoNLinput = "deno is not node";
*
* detect(LFinput); // output EOL.LF
* detect(CRLFinput); // output EOL.CRLF
* detect(Mixedinput); // output EOL.CRLF
* detect(NoNLinput); // output null
* ```
*/
export function detect(content: string): EOL | null {
const d = content.match(regDetect);
if (!d || d.length === 0) {
return null;
}
const hasCRLF = d.some((x: string): boolean => x === EOL.CRLF);
return hasCRLF ? EOL.CRLF : EOL.LF;
}
/**
* Format the file to the targeted EOL.
*
* @example
* ```ts
* import { EOL, format } from "https://deno.land/std@$STD_VERSION/fs/mod.ts";
*
* const CRLFinput = "deno\r\nis not\r\nnode";
*
* format(CRLFinput, EOL.LF); // output "deno\nis not\nnode"
* ```
*/
export function format(content: string, eol: EOL): string {
return content.replace(regDetect, eol);
}