正则表达式从 .css 文件中查找所有类名

问题描述 投票：0回答：1

我正在为一个开源项目处理一张票。有超过 800 个 css 文件，我需要从所有这些文件中获取所有类名，然后检查所有 HTML 文件中是否有这些类名。目标是找到哪些类没有在项目中的任何地方使用并删除它们。所以第一步是正确提取所有类名。

问题是我在构建正确的正则表达式来获取所有类名时遇到了麻烦，因为一些 css 文件的类名格式不正确，它们都在 1 行上，像 1 个大的连续句子一样混乱，其中最小的空白。因此，我创建的正则表达式会中断这些事件，并且无法提取类名。我必须创建一个更复杂但更灵活的正则表达式，并且我寻求指导。

一些格式示例：

.class-Name-Here {
}

.class1,.class2,.class3 {
}

.class1 .class2 {
}

但是确实存在像这样的混乱格式（真实示例）：

.toast-title{font-weight:700}.toast-message{word-wrap:break-word}.toast-message a,.toast-message label{color:#FFF}.toast-message a:hover{color:#CCC;text-decoration:none}.toast-close-button{position:relative;right:-.3em;top:-.3em;float:right;font-size:20px;font-weight:700;color:#FFF;-webkit-text-shadow:0 1px 0 #fff;text-shadow:0 1px 0 #fff;opacity:.8}.toast-top-center,.toast-top-full-width{top:0;right:0;width:100%}.toast-close-button:focus,.toast-close-button:hover{color:#000;text-decoration:none;cursor:pointer;opacity:.4}button.toast-close-button{padding:0;cursor:pointer;background:0 0;border:0;-webkit-appearance:none}.toast-bottom-center{bottom:0;right:0;width:100%}.toast-bottom-full-width{bottom:0;right:0;width:100%}.toast-top-left{top:12px;left:12px}.toast-top-right{top:12px;right:12px}.toast-bottom-right{right:12px;bottom:12px}.toast-bottom-left{bottom:12px;left:12px}#toast-container{position:fixed;z-index:999999}#toast-container *{-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box}#toast-container>div{position:relative;overflow:hidden;margin:0 0 6px;padding:15px 15px 15px 50px;width:300px;-moz-border-radius:3px;-webkit-border-radius:3px;border-radius:3px;background-position:15px center;background-repeat:no-repeat;-moz-box-shadow:0 0 12px #999;-webkit-box-shadow:0 0 12px #999;box-shadow:0 0 12px #999;color:#FFF;opacity:.8}#toast-container>:hover{-moz-box-shadow:0 0 12px #000;-webkit-box-shadow:0 0 12px #000;box-shadow:0 0 12px #000;opacity:1;cursor:pointer}#toast-container>.toast-info{background-image:url(data:image/png;base64,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)!important}#toast-container>.toast-error{background-image:url(data:image/png;base64,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)!important}#toast-container>.toast-success{background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAYAAADgdz34AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADsSURBVEhLY2AYBfQMgf///3P8+/evAIgvA/FsIF+BavYDDWMBGroaSMMBiE8VC7AZDrIFaMFnii3AZTjUgsUUWUDA8OdAH6iQbQEhw4HyGsPEcKBXBIC4ARhex4G4BsjmweU1soIFaGg/WtoFZRIZdEvIMhxkCCjXIVsATV6gFGACs4Rsw0EGgIIH3QJYJgHSARQZDrWAB+jawzgs+Q2UO49D7jnRSRGoEFRILcdmEMWGI0cm0JJ2QpYA1RDvcmzJEWhABhD/pqrL0S0CWuABKgnRki9lLseS7g2AlqwHWQSKH4oKLrILpRGhEQCw2LiRUIa4lwAAAABJRU5ErkJggg==)!important}#toast-container>.toast-warning{background-image:url(data:image/png;base64,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)!important}#toast-container.toast-bottom-center>div,#toast-container.toast-top-center>div{width:300px;margin:auto}#toast-container.toast-bottom-full-width>div,#toast-container.toast-top-full-width>div{width:96%;margin:auto}.toast{background-color:#030303}.toast-success{background-color:#51A351}.toast-error{background-color:#BD362F}.toast-info{background-color:#2F96B4}.toast-warning{background-color:#F89406}.toast-progress{position:absolute;left:0;bottom:0;height:4px;background-color:#000;opacity:.4}.toast{opacity:1!important}.toast.ng-enter{opacity:0!important;transition:opacity .3s linear}.toast.ng-enter.ng-enter-active{opacity:1!important}.toast.ng-leave{opacity:1;transition:opacity .3s linear}.toast.ng-leave.ng-leave-active{opacity:0!important}@media all and (max-width:240px){#toast-container>div{padding:8px 8px 8px 50px;width:11em}#toast-container .toast-close-button{right:-.2em;top:-.2em}}@media all and (min-width:241px) and (max-width:480px){#toast-container>div{padding:8px 8px 8px 50px;width:18em}#toast-container .toast-close-button{right:-.2em;top:-.2em}}@media all and (min-width:481px) and (max-width:768px){#toast-container>div{padding:15px 15px 15px 50px;width:25em}}/*!

我需要创建一个非常灵活的正则表达式来获取所有这些类名。

问题是它变得相当复杂，我正在尝试创建一些具有以下功能的东西：

我对类名做了一些分析，它们遵循以下一般规则：

  1. 从 开始。并且可以被链接多次： 例如：
    .Interesting-Complex.Class-Name2.Specialty_Class {
  2. 多次使用
    A-Z
    、
    a-z
    和有时
    -
    和
    _
  3. 可以以换行符、逗号、
    {
    或
    :
    4. 结尾
  4. 有时前面有 
    }

我现在的表情是：

((?<=}))?\.(\w+(-+?)\w+)+?((?={)|(?=\s)|(?=,)|(?=:))

但它不适用于简单的情况，例如：

.glyphicon {
}

因为它认为 

-
是强制性的，所以不会选择它。 它在链式类上也失败了，例如： 例如：
.Interesting-Complex.Class-Name2.Specialty_Class {

python regex regex-lookarounds
1个回答
0
投票

正如 @JaredSmith 所建议的，你不应该使用正则表达式，而应该使用成熟的 CSS 解析器。例如，tinycss2：

import tinycss2

def get_css_classes(string):
  tree = tinycss2.parse_stylesheet(string)
  
  for top_level_token in tree:
    if top_level_token.type != 'qualified-rule':
      continue
    
    prelude_tokens = top_level_token.prelude
    
    for index, token in enumerate(prelude_tokens[1:], 1):
      previous_token = prelude_tokens[index - 1]
      
      if token.type == 'ident' and previous_token == '.':
        yield token.value

对于以下内容：

@media only screen and (max-width: 1000px) {
  .class-name {
    display: none;
    & > #nested-css { caret-color: #e8403a }
  }
}

.class-Name-Here {
}
.class1,.class2,.class3 {
}

.class1 .class2 {
}.glyphicon {
}

.Interesting-Complex.Class-Name2.Specialty_Class {}

它输出：

[
  'class-Name-Here', 'class1', 'class2', 'class3', 'class1', 'class2',
  'glyphicon', 'Interesting-Complex', 'Class-Name2', 'Specialty_Class'
]

正如你所看到的，这个函数非常粗糙，不能正确处理 at 规则。但是，它应该为您的实际实施提供良好的基线。

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