next-csrf/example/node_modules/ally.js/is/is.util.js

CSRF mitigation library for Next.js

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.isUserModifyWritable = isUserModifyWritable;
exports.hasCssOverflowScroll = hasCssOverflowScroll;
exports.hasCssDisplayFlex = hasCssDisplayFlex;
exports.isScrollableContainer = isScrollableContainer;

// this is a shared utility file for focus-relevant.js and tabbable.js
// separate testing of this file's functions is not necessary,
// as they're implicitly tested by way of the consumers

function isUserModifyWritable(style) {
  // https://www.w3.org/TR/1999/WD-css3-userint-19990916#user-modify
  // https://github.com/medialize/ally.js/issues/17
  var userModify = style.webkitUserModify || '';
  return Boolean(userModify && userModify.indexOf('write') !== -1);
}

function hasCssOverflowScroll(style) {
  return [style.getPropertyValue('overflow'), style.getPropertyValue('overflow-x'), style.getPropertyValue('overflow-y')].some(function (overflow) {
    return overflow === 'auto' || overflow === 'scroll';
  });
}

function hasCssDisplayFlex(style) {
  return style.display.indexOf('flex') > -1;
}

function isScrollableContainer(element, nodeName, parentNodeName, parentStyle) {
  if (nodeName !== 'div' && nodeName !== 'span') {
    // Internet Explorer advances scrollable containers and bodies to focusable
    // only if the scrollable container is <div> or <span> - this does *not*
    // happen for <section>, <article>, …
    return false;
  }

  if (parentNodeName && parentNodeName !== 'div' && parentNodeName !== 'span' && !hasCssOverflowScroll(parentStyle)) {
    return false;
  }

  return element.offsetHeight < element.scrollHeight || element.offsetWidth < element.scrollWidth;
}
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