mdtocs/cjs/utils/parse.js

Markdown table of contents generator.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.parse = parse;
const constants_1 = require("../constants");
function parse(markdown) {
    const headings = markdown.match(constants_1.HEADINGS_REGEX);
    if (headings === null) {
        return [];
    }
    const fragments = {};
    const initialValue = [];
    return headings.reduce((accumulator, heading) => {
        const [level, text] = getHeadingLevelAndText(heading);
        if (level && text) {
            accumulator.push({
                level,
                text,
                fragment: createFragment(text, fragments),
            });
        }
        return accumulator;
    }, initialValue);
}
function getHeadingLevelAndText(heading) {
    const headingMatch = heading.match(constants_1.HEADING_REGEX);
    if (headingMatch === null) {
        return [];
    }
    const [, headingLevel, headingText, headingTextAlternate, headingLevelAlternate,] = headingMatch;
    let text;
    let level;
    if (headingLevelAlternate) {
        level = headingLevelAlternate === constants_1.HYPHEN ? 2 : 1;
        text = headingTextAlternate.trim();
    }
    else {
        level = headingLevel.length;
        text = headingText.trim();
    }
    if (!text) {
        return [];
    }
    return [level, text];
}
function createFragment(text, fragments) {
    const fragment = text
        .toLowerCase()
        .split(constants_1.WHITESPACE_REGEX)
        .join('-')
        .replace(constants_1.INVALID_FRAGMENT_REGEX, '');
    const count = fragments[fragment];
    if (count) {
        fragments[fragment]++;
        return fragment + constants_1.HYPHEN + count;
    }
    fragments[fragment] = 1;
    return fragment;
}