misc.js

var _ = require('./index')
var config = require('../config')
var commonTagRE = /^(div|p|span|img|a|br|ul|ol|li|h1|h2|h3|h4|h5|table|tbody|tr|td|pre)$/

/**
 * Check if an element is a component, if yes return its
 * component id.
 *
 * @param {Element} el
 * @param {Object} options
 * @return {String|undefined}
 */

exports.checkComponent = function (el, options) {
  var tag = el.tagName.toLowerCase()
  if (tag === 'component') {
    // dynamic syntax
    var exp = el.getAttribute('is')
    el.removeAttribute('is')
    return exp
  } else if (
    !commonTagRE.test(tag) &&
    _.resolveAsset(options, 'components', tag)
  ) {
    return tag
  }
}

/**
 * Create an "anchor" for performing dom insertion/removals.
 * This is used in a number of scenarios:
 * - block instance
 * - v-html
 * - v-if
 * - component
 * - repeat
 *
 * @param {String} content
 * @param {Boolean} persist - IE trashes empty textNodes on
 *                            cloneNode(true), so in certain
 *                            cases the anchor needs to be
 *                            non-empty to be persisted in
 *                            templates.
 * @return {Comment|Text}
 */

exports.createAnchor = function (content, persist) {
  return config.debug
    ? document.createComment(content)
    : document.createTextNode(persist ? ' ' : '')
}