javascript-tutorial-server/modules/markit/plugins/headerAnchor.js at master · easytechlr/javascript-tutorial-server · GitHub

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'use strict';


/**
 * Reads ## Heading [#anchor]
 * Transliterates heading text if no anchor
 * writes that to `headingToken.anchor`
 *
 * Renders as link if `options.linkHeaderTag` or header id
 */

const parseAttrs = require('../utils/parseAttrs');
const makeAnchor = require('textUtil/makeAnchor');

const t = require('i18n');

t.requirePhrase('markit', 'error');

// add headingToken.achor
// not "id" attr, because rendering uses `.anchor` for the extra link OR id
function readHeadingAnchor(state) {

  let env = state.env;
  if (!env.headingsMap) env.headingsMap = new Map();

  let tokens = state.tokens;
  for (let idx = 0; idx < state.tokens.length; idx++) {
    let headingToken = state.tokens[idx];

    if (headingToken.type !== 'heading_open') continue;

    idx++;

    let inlineToken = tokens[idx];
    if (inlineToken.type != 'inline') continue;

    let anchorReg = /\s+\[#(.*?)\]$/;
    let anchor;
    if (inlineToken.content.match(anchorReg)) {
      anchor = inlineToken.content.match(anchorReg)[1];

      // strip [#...] from token content
      inlineToken.content = inlineToken.content.replace(anchorReg, '');
      let lastTextToken = inlineToken.children[inlineToken.children.length - 1];
      lastTextToken.content = inlineToken.content.replace(anchorReg, '');

      if (env.headingsMap.has(anchor)) {
        // fixed anchor, cannot change, add -1 -2
        lastTextToken.type = 'markdown_error_inline';
        lastTextToken.content = t('markit.error.anchor_exists', {anchor: 'anchor'});
      } else {
        env.headingsMap.set(anchor, 1);
      }

    } else {
      anchor = makeAnchor(inlineToken.content, state.md.options.translitAnchors);

      if (env.headingsMap.has(anchor)) {
        // иначе просто добавляю -2, -3 ...
        env.headingsMap.set(anchor, env.headingsMap.get(anchor) + 1);
        anchor = anchor + '-' + env.headingsMap.get(anchor);
      } else {
        env.headingsMap.set(anchor, 1);
      }

    }


    headingToken.anchor = anchor;

  }

}

module.exports = function(md) {

  md.core.ruler.push('read_heading_anchor', readHeadingAnchor);

  md.renderer.rules.heading_open = function(tokens, idx, options, env, slf) {
    let token = tokens[idx];
    let anchor = token.anchor;
    if (options.linkHeaderTag) {
      return `<${token.tag}${slf.renderAttrs(token)}><a class="main__anchor" name="${anchor}" href="#${anchor}">`;
    } else {
      // for ebook need id
      return `<${token.tag} id="${anchor}">`;
    }
  };

  md.renderer.rules.heading_close = function(tokens, idx, options, env, slf) {
    let token = tokens[idx];
    if (options.linkHeaderTag) {
      return `</a></${token.tag}>`;
    } else {
      return `</${token.tag}>`;
    }
  };

};