gatsby-remark-prismjs/escape-html.js

Adds syntax highlighting to code blocks at build time using PrismJS

"use strict";

module.exports = (code, additionalHtmlEscapes = {}) => {
  const baseHTMLEscapes = {
    "&": `&`,
    ">": `>`,
    "<": `&lt;`,
    '"': `&quot;`,
    "'": `&#39;`
  };
  const htmlEscapes = {
    ...additionalHtmlEscapes,
    ...baseHTMLEscapes
  };
  const escapedChars = char => htmlEscapes[char];
  const chars = Object.keys(htmlEscapes);
  const charsRe = new RegExp(`[${chars.join(``)}]`, `g`);
  const rehasUnescapedChars = new RegExp(charsRe.source);
  return code && rehasUnescapedChars.test(code) ? code.replace(charsRe, escapedChars) : code;
};