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

Transform Markdown into JSX or React component modules

'use strict';

var decode = require('parse-entities');
var decimal = require('is-decimal');
var alphabetical = require('is-alphabetical');
var locate = require('../locate/email');

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

var plusSign = 43; // '+'
var dash = 45; // '-'
var dot = 46; // '.'
var atSign = 64; // '@'
var underscore = 95; // '_'

function email(eat, value, silent) {
  var self = this;
  var gfm = self.options.gfm;
  var tokenizers = self.inlineTokenizers;
  var index = 0;
  var length = value.length;
  var firstDot = -1;
  var code;
  var content;
  var children;
  var exit;

  if (!gfm) {
    return;
  }

  code = value.charCodeAt(index);

  while (
    decimal(code) ||
    alphabetical(code) ||
    code === plusSign ||
    code === dash ||
    code === dot ||
    code === underscore
  ) {
    code = value.charCodeAt(++index);
  }

  if (index === 0) {
    return;
  }

  if (code !== atSign) {
    return;
  }

  index++;

  while (index < length) {
    code = value.charCodeAt(index);

    if (
      decimal(code) ||
      alphabetical(code) ||
      code === dash ||
      code === dot ||
      code === underscore
    ) {
      index++;

      if (firstDot === -1 && code === dot) {
        firstDot = index;
      }

      continue;
    }

    break;
  }

  if (
    firstDot === -1 ||
    firstDot === index ||
    code === dash ||
    code === underscore
  ) {
    return;
  }

  if (code === dot) {
    index--;
  }

  content = value.slice(0, index);

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

  exit = self.enterLink();

  // Temporarily remove all tokenizers except text in url.
  self.inlineTokenizers = { text: tokenizers.text };
  children = self.tokenizeInline(content, eat.now());
  self.inlineTokenizers = tokenizers;

  exit();

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