@mapbox/jsxtreme-markdown/vendor/remark-parse/lib/tokenize/heading-setext.js

Transform Markdown into JSX or React component modules

'use strict';

module.exports = setextHeading;

var lineFeed = '\n';
var tab = '\t';
var space = ' ';
var equalsTo = '=';
var dash = '-';

var maxIndent = 3;

var equalsToDepth = 1;
var dashDepth = 2;

function setextHeading(eat, value, silent) {
  var self = this;
  var now = eat.now();
  var length = value.length;
  var index = -1;
  var subvalue = '';
  var content;
  var queue;
  var character;
  var marker;
  var depth;

  // Eat initial indentation.
  while (++index < length) {
    character = value.charAt(index);

    if (character !== space || index >= maxIndent) {
      index--;
      break;
    }

    subvalue += character;
  }

  // Eat content.
  content = '';
  queue = '';

  while (++index < length) {
    character = value.charAt(index);

    if (character === lineFeed) {
      index--;
      break;
    }

    if (character === space || character === tab) {
      queue += character;
    } else {
      content += queue + character;
      queue = '';
    }
  }

  now.column += subvalue.length;
  now.offset += subvalue.length;
  subvalue += content + queue;

  // Ensure the content is followed by a newline and a valid marker.
  character = value.charAt(++index);
  marker = value.charAt(++index);

  if (character !== lineFeed || (marker !== equalsTo && marker !== dash)) {
    return;
  }

  subvalue += character;

  // Eat Setext-line.
  queue = marker;
  depth = marker === equalsTo ? equalsToDepth : dashDepth;

  while (++index < length) {
    character = value.charAt(index);

    if (character !== marker) {
      if (character !== lineFeed) {
        return;
      }

      index--;
      break;
    }

    queue += character;
  }

  if (silent) {
    return true;
  }

  return eat(subvalue + queue)({
    type: 'heading',
    depth: depth,
    children: self.tokenizeInline(content, now),
  });
}