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joplin/packages/renderer/MdToHtml/rules/highlight_keywords.ts

71 lines
1.9 KiB
TypeScript

// This plugin is used only on mobile, to highlight search results.
import { RuleOptions } from '../../MdToHtml';
const stringUtils = require('../../stringUtils.js');
const md5 = require('md5');
function createHighlightedTokens(Token: any, splitted: string[]) {
let token;
const output = [];
for (let i = 0; i < splitted.length; i++) {
const text = splitted[i];
if (!text) continue;
if (i % 2 === 0) {
token = new Token('text', '', 0);
token.content = text;
output.push(token);
} else {
token = new Token('highlighted_keyword_open', 'span', 1);
token.attrs = [['class', 'highlighted-keyword']];
output.push(token);
token = new Token('text', '', 0);
token.content = text;
output.push(token);
token = new Token('highlighted_keyword_close', 'span', -1);
output.push(token);
}
}
return output;
}
// function installRule(markdownIt, mdOptions, ruleOptions) {
function plugin(markdownIt: any, ruleOptions: RuleOptions) {
const divider = md5(Date.now().toString() + Math.random().toString());
markdownIt.core.ruler.push('highlight_keywords', (state: any) => {
const keywords = ruleOptions.highlightedKeywords;
if (!keywords || !keywords.length) return;
const tokens = state.tokens;
const Token = state.Token;
for (let i = 0; i < tokens.length; i++) {
const token = tokens[i];
if (token.type !== 'inline') continue;
for (let j = 0; j < token.children.length; j++) {
const child = token.children[j];
if (child.type !== 'text') continue;
const splitted = stringUtils.surroundKeywords(keywords, child.content, divider, divider).split(divider);
const splittedTokens = createHighlightedTokens(Token, splitted);
if (splittedTokens.length <= 1) continue;
token.children = markdownIt.utils.arrayReplaceAt(token.children, j, splittedTokens);
j += splittedTokens.length - 1;
}
}
});
}
export default {
plugin,
};