@mapbox/jsxtreme-markdown/vendor/remark-parse/lib/tokenize/html-inline.js

Transform Markdown into JSX or React component modules

'use strict';

var alphabetical = require('is-alphabetical');
var locate = require('../locate/tag');
var tag = require('../util/html').tag;

module.exports = inlineHTML;
inlineHTML.locator = locate;

var lessThan = '<';
var questionMark = '?';
var exclamationMark = '!';
var slash = '/';

var htmlLinkOpenExpression = /^<a /i;
var htmlLinkCloseExpression = /^<\/a>/i;

function inlineHTML(eat, value, silent) {
  var self = this;
  var length = value.length;
  var character;
  var subvalue;

  if (value.charAt(0) !== lessThan || length < 3) {
    return;
  }

  character = value.charAt(1);

  if (
    !alphabetical(character) &&
    character !== questionMark &&
    character !== exclamationMark &&
    character !== slash
  ) {
    return;
  }

  subvalue = value.match(tag);

  if (!subvalue) {
    return;
  }

  /* istanbul ignore if - not used yet. */
  if (silent) {
    return true;
  }

  subvalue = subvalue[0];

  if (!self.inLink && htmlLinkOpenExpression.test(subvalue)) {
    self.inLink = true;
  } else if (self.inLink && htmlLinkCloseExpression.test(subvalue)) {
    self.inLink = false;
  }

  return eat(subvalue)({ type: 'html', value: subvalue });
}