Function getValueForProperty

code/styling/public/app.js:4257–4309

* Get the value for a property on a node. Only used in DEV for SSR validation. * The "expected" argument is used as a hint of what the expected value is. * Some properties have multiple equivalent values.

(node, name, expected, propertyInfo)

 * Some properties have multiple equivalent values.
 */
function getValueForProperty(node, name, expected, propertyInfo) {
  {
    if (propertyInfo.mustUseProperty) {
      var propertyName = propertyInfo.propertyName;

      return node[propertyName];
    } else {
      var attributeName = propertyInfo.attributeName;

      var stringValue = null;

      if (propertyInfo.type === OVERLOADED_BOOLEAN) {
        if (node.hasAttribute(attributeName)) {
          var value = node.getAttribute(attributeName);
          if (value === '') {
            return true;
          }
          if (shouldRemoveAttribute(name, expected, propertyInfo, false)) {
            return value;
          }
          if (value === '' + expected) {
            return expected;
          }
          return value;
        }
      } else if (node.hasAttribute(attributeName)) {
        if (shouldRemoveAttribute(name, expected, propertyInfo, false)) {
          // We had an attribute but shouldn't have had one, so read it
          // for the error message.
          return node.getAttribute(attributeName);
        }
        if (propertyInfo.type === BOOLEAN) {
          // If this was a boolean, it doesn't matter what the value is
          // the fact that we have it is the same as the expected.
          return expected;
        }
        // Even if this property uses a namespace we use getAttribute
        // because we assume its namespaced name is the same as our config.
        // To use getAttributeNS we need the local name which we don't have
        // in our config atm.
        stringValue = node.getAttribute(attributeName);
      }

      if (shouldRemoveAttribute(name, expected, propertyInfo, false)) {
        return stringValue === null ? expected : stringValue;
      } else if (stringValue === '' + expected) {
        return expected;
      } else {
        return stringValue;
      }
    }
  }
}

/**
 * Get the value for a attribute on a node. Only used in DEV for SSR validation.