Question

我正在使用Nokogiri作为工具来帮助我完成一项我正在上学的项目。现在，该项目的想法是在HTML文档中搜索用户提供的关键字。该函数将在<body>元素之后的HTML字符串中查找所有出现的关键字，除非关键字出现在HTML标记内，然后将带有标记的字符串包围为“突出显示”关键字。现在我的代码失败了一个非常大的错误调用堆栈。主要错误是这样的：引入nokogiri :: CSS ::语法错误：意想不到＆＃39; $＆＃39;后＆＃39;＆＃39; [：substring_match，＆＃34;简单＆＃34;]＆＃39;（引入nokogiri :: CSS ::的SyntaxError ）

我当前的方法：

require 'nokogiri'

file = File.open ("desktop/Personal/code.HTML")

@doc = Nokogiri::HTML(file)

puts @doc

puts "Welcome to the HTML keyword highlighter!"
puts "Please enter a keyword"
keyword = gets.chomp

highlight = "<span style='background-color: yellow; color: black'>#{keyword}</span>"

search = @doc.xpath("//body").search("[text()*=#{keyword}")

search.each do |node|
    nodeN = node.name
    nodeH = node.content.gsub(keyword, highlight)
    node.replace(nodeH)
end
file.close

错误调用堆栈：

     /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2. 0.0/gems/nokogiri-1.5.6/lib/nokogiri/css/parser_extras.rb:87:in `on_error': unexpected '$' after '[:substring_match, "simple"]' (Nokogiri::CSS::SyntaxError)
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/racc/parser.rb:258:in `_racc_do_parse_c'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/racc/parser.rb:258:in `do_parse'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/css/parser_extras.rb:62:in `parse'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/css/parser_extras.rb:79:in `xpath_for'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/css.rb:23:in `xpath_for'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/xml/node_set.rb:111:in `block (2 levels) in css'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/xml/node_set.rb:109:in `map'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/xml/node_set.rb:109:in `block in css'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/xml/node_set.rb:239:in `block in each'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/xml/node_set.rb:238:in `upto'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/xml/node_set.rb:238:in `each'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/xml/node_set.rb:105:in `css'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/xml/node_set.rb:81:in `block in search'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/xml/node_set.rb:80:in `each'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0/gems/nokogiri-1.5.6/lib/nokogiri/xml/node_set.rb:80:in `search'
    from /Users/Eva/Desktop/Personal/Project_Nokogiri.rb:21:in `<main>'

关于如何防止这种情况的任何建议都将受到真正的赞赏！我是编程，Ruby和Nokogiri的新手，所以我很少理解如何自己解决这个问题。对不起格式化不好。谢谢你的帮助！

Answer 1

您忘记关闭方括号：

search = @doc.xpath("//body").search("[text()*=\"#{keyword}\"]")

我会添加引号以防万一：

keyword

（您可以通过确保双引号在{{1}}中进行转义以使其具有防弹性来扩展它）

Nokogiri方法错误

1 个答案: