Function compileElement

06.Router/basic/js/vue.js:7112–7143

* Compile an element and return a nodeLinkFn. * * @param {Element} el * @param {Object} options * @return {Function|null}

(el, options)

   */

  function compileElement(el, options) {
    // preprocess textareas.
    // textarea treats its text content as the initial value.
    // just bind it as an attr directive for value.
    if (el.tagName === 'TEXTAREA') {
      var tokens = parseText(el.value);
      if (tokens) {
        el.setAttribute(':value', tokensToExp(tokens));
        el.value = '';
      }
    }
    var linkFn;
    var hasAttrs = el.hasAttributes();
    var attrs = hasAttrs && toArray(el.attributes);
    // check terminal directives (for & if)
    if (hasAttrs) {
      linkFn = checkTerminalDirectives(el, attrs, options);
    }
    // check element directives
    if (!linkFn) {
      linkFn = checkElementDirectives(el, options);
    }
    // check component
    if (!linkFn) {
      linkFn = checkComponent(el, options);
    }
    // normal directives
    if (!linkFn && hasAttrs) {
      linkFn = compileDirectives(attrs, options);
    }
    return linkFn;
  }

  /**
   * Compile a textNode and return a nodeLinkFn.