@mapbox/jsxtreme-markdown/vendor/remark-parse/lib/tokenize/auto-link.js

Transform Markdown into JSX or React component modules

'use strict';

var whitespace = require('is-whitespace-character');
var decode = require('parse-entities');
var locate = require('../locate/tag');

module.exports = autoLink;
autoLink.locator = locate;
autoLink.notInLink = true;

var lessThan = '<';
var greaterThan = '>';
var atSign = '@';
var slash = '/';
var mailto = 'mailto:';
var mailtoLength = mailto.length;

function autoLink(eat, value, silent) {
  var self = this;
  var subvalue = '';
  var length = value.length;
  var index = 0;
  var queue = '';
  var hasAtCharacter = false;
  var link = '';
  var character;
  var now;
  var content;
  var tokenizers;
  var exit;

  if (value.charAt(0) !== lessThan) {
    return;
  }

  index++;
  subvalue = lessThan;

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

    if (
      whitespace(character) ||
      character === greaterThan ||
      character === atSign ||
      (character === ':' && value.charAt(index + 1) === slash)
    ) {
      break;
    }

    queue += character;
    index++;
  }

  if (!queue) {
    return;
  }

  link += queue;
  queue = '';

  character = value.charAt(index);
  link += character;
  index++;

  if (character === atSign) {
    hasAtCharacter = true;
  } else {
    if (character !== ':' || value.charAt(index + 1) !== slash) {
      return;
    }

    link += slash;
    index++;
  }

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

    if (whitespace(character) || character === greaterThan) {
      break;
    }

    queue += character;
    index++;
  }

  character = value.charAt(index);

  if (!queue || character !== greaterThan) {
    return;
  }

  /* istanbul ignore if - never used (yet) */
  if (silent) {
    return true;
  }

  link += queue;
  content = link;
  subvalue += link + character;
  now = eat.now();
  now.column++;
  now.offset++;

  if (hasAtCharacter) {
    if (link.slice(0, mailtoLength).toLowerCase() === mailto) {
      content = content.slice(mailtoLength);
      now.column += mailtoLength;
      now.offset += mailtoLength;
    } else {
      link = mailto + link;
    }
  }

  // Temporarily remove all tokenizers except text in autolinks.
  tokenizers = self.inlineTokenizers;
  self.inlineTokenizers = { text: tokenizers.text };

  exit = self.enterLink();

  content = self.tokenizeInline(content, now);

  self.inlineTokenizers = tokenizers;
  exit();

  return eat(subvalue)({
    type: 'link',
    title: null,
    url: decode(link, { nonTerminated: false }),
    children: content,
  });
}