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CSS改编/网页响应式 适配工作者

给CSS适配人员用的辅助工具函数

当前为 2022-02-06 提交的版本，查看 最新版本。

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/439632/1015906/CSS%E6%94%B9%E7%BC%96%E7%BD%91%E9%A1%B5%E5%93%8D%E5%BA%94%E5%BC%8F%20%E9%80%82%E9%85%8D%E5%B7%A5%E4%BD%9C%E8%80%85.js 

// ==UserScript==
// @name            CSS改编/网页响应式 适配工作者
// @version         0.55
// @description     给CSS适配人员用的辅助工具函数
// @description:en  Helper functions for adaptation developers
// @match           *://*/*
// @license         The Unlicense
// @namespace https://greasyfork.org/users/871942
// ==/UserScript==


function extract_those_elements_whose_attributes_include_styles(doc = document, filterAttr) {
  const elems = []
  elems.push(...[...doc.all].filter(el => (!filterAttr || el.hasAttribute(filterAttr)) && !/\b(a|img|span)\b/.test(el.localName) && (el.localName === 'iframe' ? elems.push(...extract_those_elements_whose_attributes_include_styles(el.contentDocument)) && false : el.attributes.style?.value)))
  return elems
}
function extractStyleToCssForm(elem) {
  let { localName, attributes: { id = '', class: className = '', style } } = elem
  if (specTags.has(localName)) {
    id = className = ''
  } else {
    localName = ''
    if (className) className = className.value.replace(/ |^/g, '.')
    if (id) {
      id = /[-]|auto|\bid\b/.test(id.value) ? '' : `#${id.value}`
      if (id) className = ''
    }
  }
  return `${localName}${id}${className} { ${style.value.replace(/(:) /g, '$1').replace(/;\b/g, '$& ').replace(/;$/, '')} }`
}
const specTags = new Set(['body'])
unsafeWindow._extractCssOfModifiedInPage =
  function extractCssOfModifiedInPage(doc, { filterAttr = '', existing = 'user-custom' } = {}) {
    doc = doc.getRootNode() // `doc` can be an arbitrarily selected leaf node without having to pay attention to selecting `HTMLDocument`
    let orig = existing && doc instanceof Node && doc.querySelector(`style[${existing}]`)?.innerText || ''
      , new_ = extract_those_elements_whose_attributes_include_styles(doc, filterAttr).map(extractStyleToCssForm).join('\n')
    return { modified: mergeCommonCss(new_), merged: mergeCommonCss(orig + new_) }
  }
function mergeCommonCss(css = '') {
  const re = {
    node: [/^(\s*)([^{}}]+)\s*\{([^}]+?)\s*\}(.*?)\2\{([^}]+?)\s*\}/ms, '$1$2{$3;$5 }$4'],
    nodes: [/([^{\n]+?)(\s*\{[^}]+\})(.*?)\s*([^{\n]+?)\2/s, '$1, $4$2$3']
  }
  let merged
  Object.values(re).forEach(([mat, pla]) => {
    const merge = str => str.replace(mat, pla)
    merged = merge(css)
    while (css !== merged) merged = merge(css = merged)
  })
  return merged
}

unsafeWindow._findOverflowedElems =
  function findOverflowedElems(rootElem) {
    if (!(rootElem instanceof HTMLElement)) throw TypeError('An entry element is required to be specified.')
    return [...rootElem.querySelectorAll('*')].filter(el => el.clientWidth > rootElem.clientWidth)
  }