import { Rule } from './rule-interface';
/**
* MD042: No empty links
*
* This rule is triggered when links have empty URLs or text. These empty links
* don't point to anything and should be removed or filled in with proper content.
* Empty links in markdown take the form of [] or [text]() or [](url).
*/
export const name = 'MD042';
export const description = 'No empty links';
/**
* Check if a string contains empty links
* An empty link can be [] or [text]() or [](url)
* @param line The line to check
* @returns True if the line contains empty links
*/
function hasEmptyLinks(line: string): boolean {
// Match empty links: [] or [text]() or [](url)
return /\[\](?:\(\)|\([^)]+\))?|\[[^\]]+\]\(\)/.test(line);
}
/**
* Fix empty links by removing them
* @param lines Array of string lines to fix
* @returns Fixed lines array with empty links removed
*/
export function fix(lines: string[]): string[] {
return lines.map(line => {
if (!hasEmptyLinks(line)) {
return line;
}
// Replace links with empty text and URL: []()
let fixedLine = line.replace(/\[\]\(\)/g, '');
// Replace links with empty text but with URL: [](url)
fixedLine = fixedLine.replace(/\[\]\(([^)]+)\)/g, '$1');
// Replace links with text but empty URL: [text]()
fixedLine = fixedLine.replace(/\[([^\]]+)\]\(\)/g, '$1');
// Replace completely empty links: []
fixedLine = fixedLine.replace(/\[\]/g, '');
return fixedLine;
});
}
/**
* Rule implementation for MD042
*/
export const rule: Rule = {
name,
description,
fix
};
export default rule;
