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import { escape } from 'lodash';
/**
* Highlight.js plugin for wrapping nodes with the correct selectors to ensure
* child-elements are highlighted correctly after we split up the result into chunks and lines.
*
* Plugin API: https://github.com/highlightjs/highlight.js/blob/main/docs/plugin-api.rst
*
* @param {Object} Result - an object that represents the highlighted result from Highlight.js
*/
const newlineRegex = /\r?\n/;
const generateClassName = (suffix) => (suffix ? `hljs-${escape(suffix)}` : '');
const generateCloseTag = (includeClose) => (includeClose ? '</span>' : '');
const generateHLJSTag = (kind, content = '', includeClose) =>
`<span class="${generateClassName(kind)}">${escape(content)}${generateCloseTag(includeClose)}`;
const format = (node, kind = '') => {
let buffer = '';
if (typeof node === 'string') {
buffer += node
.split(newlineRegex)
.map((newline) => generateHLJSTag(kind, newline, true))
.join('\n');
} else if (node.kind) {
const { children } = node;
if (children.length && children.length === 1) {
buffer += format(children[0], node.kind);
} else {
buffer += generateHLJSTag(node.kind);
children.forEach((subChild) => {
buffer += format(subChild, node.kind);
});
buffer += `</span>`;
}
}
return buffer;
};
export default (result) => {
// NOTE: We're using the private Emitter API here as we expect the Emitter API to be publicly available soon (https://github.com/highlightjs/highlight.js/issues/3621)
// eslint-disable-next-line no-param-reassign, no-underscore-dangle
result.value = result._emitter.rootNode.children.reduce((val, node) => val + format(node), ''); // Highlight.js expects the result param to be mutated for plugins to work
};
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