markdown-it/lib/rules_inline/autolink.js

// Process autolinks '<protocol:...>'

'use strict';

var url_schemas = require('../common/url_schemas');


/*eslint max-len:0*/
var EMAIL_RE    = /^<([a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*)>/;
var AUTOLINK_RE = /^<([a-zA-Z.\-]{1,25}):([^<>\x00-\x20]*)>/;


module.exports = function autolink(state, silent) {
  var tail, linkMatch, emailMatch, url, fullUrl, token,
      pos = state.pos;

  if (state.src.charCodeAt(pos) !== 0x3C/* < */) { return false; }

  tail = state.src.slice(pos);

  if (tail.indexOf('>') < 0) { return false; }

  if (AUTOLINK_RE.test(tail)) {
    linkMatch = tail.match(AUTOLINK_RE);

    if (url_schemas.indexOf(linkMatch[1].toLowerCase()) < 0) { return false; }

    url = linkMatch[0].slice(1, -1);
    fullUrl = state.md.normalizeLink(url);
    if (!state.md.validateLink(fullUrl)) { return false; }

    if (!silent) {
      token         = state.push('link_open', 'a', 1);
      token.attrs   = [ [ 'href', fullUrl ] ];

      token         = state.push('text', '', 0);
      token.content = state.md.normalizeLinkText(url);

      token         = state.push('link_close', 'a', -1);
    }

    state.pos += linkMatch[0].length;
    return true;
  }

  if (EMAIL_RE.test(tail)) {
    emailMatch = tail.match(EMAIL_RE);

    url = emailMatch[0].slice(1, -1);
    fullUrl = state.md.normalizeLink('mailto:' + url);
    if (!state.md.validateLink(fullUrl)) { return false; }

    if (!silent) {
      token         = state.push('link_open', 'a', 1);
      token.attrs   = [ [ 'href', fullUrl ] ];
      token.markup  = 'autolink';
      token.info    = 'auto';

      token         = state.push('text', '', 0);
      token.content = state.md.normalizeLinkText(url);

      token         = state.push('link_close', 'a', -1);
      token.markup  = 'autolink';
      token.info    = 'auto';
    }

    state.pos += emailMatch[0].length;
    return true;
  }

  return false;
};