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export const wrapLines = (content, language) => {
const isValidLanguage = /^[a-z\d\-_]+$/.test(language); // To prevent the possibility of a vulnerability we only allow languages that contain alphanumeric characters ([a-z\d), dashes (-) or underscores (_).
return (
content &&
content
.split('\n')
.map((line, i) => {
let formattedLine;
const attributes = `id="LC${i + 1}" lang="${isValidLanguage ? language : ''}"`;
if (line.includes('<span class="hljs') && !line.includes('</span>')) {
/**
* In some cases highlight.js will wrap multiple lines in a span, in these cases we want to append the line number to the existing span
*
* example (before): <span class="hljs-code">```bash
* example (after): <span id="LC67" class="hljs-code">```bash
*/
formattedLine = line.replace(/(?=class="hljs)/, `${attributes} `);
} else {
formattedLine = `<span ${attributes} class="line">${line}</span>`;
}
return formattedLine;
})
.join('\n')
);
};
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