mathpix-markdown-it/lib/markdown/mdPluginCollapsible.js

Mathpix-markdown-it is an open source implementation of the mathpix-markdown spec written in Typescript. It relies on the following open source libraries: MathJax v3 (to render math with SVGs), markdown-it (for standard Markdown parsing)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function renderSummary(tokens, idx, options, env, slf) {
    return '<summary><span class="details-marker">&nbsp;</span>' + slf.renderInline(tokens[idx].children, options, env) + "</summary>";
}
function isWhitespace(state, start, end) {
    for (start; start < end; start++) {
        if (!state.md.utils.isWhiteSpace(state.src.charCodeAt(start)))
            return false;
    }
    return true;
}
/* eslint-disable max-statements */
function plugin(state, startLine, endLine, silent) {
    var MARKER = 43; // +
    var autoClosed = false;
    var start = state.bMarks[startLine] + state.tShift[startLine];
    var max = state.eMarks[startLine];
    if (state.src.charCodeAt(start) !== MARKER)
        return false;
    // Check out the rest of the marker string
    var pos = state.skipChars(start, MARKER);
    var markerCount = pos - start;
    if (markerCount < 3)
        return false;
    var markup = state.src.slice(start, pos);
    var params = state.src.slice(pos, max).trim();
    // Title must not be empty
    if (isWhitespace(state, pos, max))
        return false;
    // The title must not end with the marker (no inline)
    if (params.endsWith(String.fromCharCode(MARKER).repeat(markerCount)))
        return false;
    // Since start is found, we can report success here in validation mode
    if (silent)
        return true;
    // Search the end of the block
    var nextLine = startLine;
    var isEmpty = true;
    for (;;) {
        nextLine++;
        // Unclosed block should be autoclosed by end of document.
        if (nextLine >= endLine)
            break;
        start = state.bMarks[nextLine] + state.tShift[nextLine];
        max = state.eMarks[nextLine];
        // Non-empty line with negative indent should stop the list:
        // - ```
        //  test
        if (start < max && state.sCount[nextLine] < state.blkIndent)
            break;
        if (state.src.charCodeAt(start) !== MARKER) {
            if (isEmpty)
                isEmpty = isWhitespace(state, start, max);
            continue;
        }
        // Closing marker should be indented less than 4 spaces
        if (state.sCount[nextLine] - state.blkIndent >= 4)
            continue;
        pos = state.skipChars(start, MARKER);
        // Closing marker must be at least as long as the opening one
        if (pos - start < markerCount)
            continue;
        // Make sure tail has spaces only
        pos = state.skipSpaces(pos);
        if (pos < max)
            continue;
        autoClosed = true;
        break;
    }
    if (isEmpty)
        return false;
    var oldParent = state.parentType;
    var oldLineMax = state.lineMax;
    state.parentType = "container";
    // This will prevent lazy continuations from ever going past our end marker
    state.lineMax = nextLine;
    var token = state.push("collapsible_open", "details", 1);
    token.block = true;
    token.info = params;
    token.markup = markup;
    token.map = [startLine, nextLine];
    var tokens = [];
    state.md.inline.parse(params, state.md, state.env, tokens);
    token = state.push("collapsible_summary", "summary", 0);
    token.content = params;
    token.children = tokens;
    state.md.block.tokenize(state, startLine + 1, nextLine);
    token = state.push("collapsible_close", "details", -1);
    token.markup = state.src.slice(start, pos);
    token.block = true;
    state.parentType = oldParent;
    state.lineMax = oldLineMax;
    state.line = nextLine + (autoClosed ? 1 : 0);
    return true;
}
exports.default = (function (md) {
    md.block.ruler.before("fence", "collapsible", plugin, {
        alt: ["paragraph", "reference", "blockquote", "list"]
    });
    md.renderer.rules.collapsible_summary = renderSummary;
});
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