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import hljs from 'highlight.js/lib/core';
import json from 'highlight.js/lib/languages/json';
import { registerPlugins } from '../plugins/index';
import { LINES_PER_CHUNK, NEWLINE, ROUGE_TO_HLJS_LANGUAGE_MAP } from '../constants';
const initHighlightJs = (fileType, content, language) => {
// The Highlight Worker is currently scoped to JSON files.
// See the following issue for more: https://gitlab.com/gitlab-org/gitlab/-/issues/415753
hljs.registerLanguage(language, json);
registerPlugins(hljs, fileType, content, true);
};
const splitByLineBreaks = (content = '') => content.split(/\r?\n/);
const createChunk = (language, rawChunkLines, highlightedChunkLines = [], startingFrom = 0) => ({
highlightedContent: highlightedChunkLines.join(NEWLINE),
rawContent: rawChunkLines.join(NEWLINE),
totalLines: rawChunkLines.length,
startingFrom,
language,
});
const splitIntoChunks = (language, rawContent, highlightedContent) => {
const result = [];
const splitRawContent = splitByLineBreaks(rawContent);
const splitHighlightedContent = splitByLineBreaks(highlightedContent);
for (let i = 0; i < splitRawContent.length; i += LINES_PER_CHUNK) {
const chunkIndex = Math.floor(i / LINES_PER_CHUNK);
const highlightedChunk = splitHighlightedContent.slice(i, i + LINES_PER_CHUNK);
const rawChunk = splitRawContent.slice(i, i + LINES_PER_CHUNK);
result[chunkIndex] = createChunk(language, rawChunk, highlightedChunk, i);
}
return result;
};
const highlight = (fileType, rawContent, lang) => {
const language = ROUGE_TO_HLJS_LANGUAGE_MAP[lang.toLowerCase()];
let result;
if (language) {
initHighlightJs(fileType, rawContent, language);
const highlightedContent = hljs.highlight(rawContent, { language }).value;
result = splitIntoChunks(language, rawContent, highlightedContent);
}
return result;
};
export { highlight, splitIntoChunks };
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