[英]Parse HTML string with Nokogiri
我正在尝试编写一个ruby脚本,该脚本解析HTML字符串并从特定节点获取一些值。
目前,我正努力将字符串读入Nokogiri文档中:
这段代码:
#!/usr/bin/ruby
html_doc = Nokogiri::HTML("<html> <meta content="text/html; charset=UTF-8"/> <body style='margin:20px'> <p>The following user has registered a device, click on the link below to review the user and make any changes if necessary.</p> <ul style='list-style-type:none; margin:25px 15px;'> <li><b>User name:</b> Test User</li> <li><b>User email:</b> test@abc.com</li> <li><b>Identifier:</b> abc123def132afd1213afas</li> <li><b>Description:</b> Tom's iPad</li> <li><b>Model:</b> iPad 3</li> <li><b>Platform:</b> </li> <li><b>App:</b> Test app name</li> <li><b>UserID:</b> </li> </ul> <p>Review user: https://cirrus.app47.com/users?search=test@abc.com</p> <hr style='height=2px; color:#aaa'/> <p>We hope you enjoy the app store experience!</p> <p style='font-size:18px; color:#999'>Powered by App47</p> <img src='https://cirrus.app47.com/notifications/562506219ac25b1033000904/img' alt=''/></body></html>")
产生此错误:
$ ruby emailParser.rb
emailParser.rb:3: syntax error, unexpected tIDENTIFIER, expecting ')'
...ML("<html> <meta content="text/html; charset=UTF-8"/> <bod...
... ^
emailParser.rb:3: syntax error, unexpected tSTRING_BEG, expecting end-of-input
...tent="text/html; charset=UTF-8"/> <body style='margin:20px'...
... ^
请注意,我在这里尝试了具有相同结果的解决方案:
你必须HTML字符串引号从“ 里面的html为“求变字符串引号”改变。 这样的事情应该起作用:
#!/usr/bin/ruby
html_doc = Nokogiri::HTML('<html> <meta content="text/html; charset=UTF-8"/> <body style="margin:20px"> <p>The following user has registered a device, click on the link below to review the user and make any changes if necessary.</p> <ul style="list-style-type:none; margin:25px 15px;"> <li><b>User name:</b> Test User</li> <li><b>User email:</b> test@abc.com</li> <li><b>Identifier:</b> abc123def132afd1213afas</li> <li><b>Description:</b> Tom\'s iPad</li> <li><b>Model:</b> iPad 3</li> <li><b>Platform:</b> </li> <li><b>App:</b> Test app name</li> <li><b>UserID:</b> </li> </ul> <p>Review user: https://cirrus.app47.com/users?search=test@abc.com</p> <hr style="height=2px; color:#aaa"/> <p>We hope you enjoy the app store experience!</p> <p style="font-size:18px; color:#999">Powered by App47</p> <img src="https://cirrus.app47.com/notifications/562506219ac25b1033000904/img" alt=""/></body></html>')
问题是您的字符串中有双引号,这会使解析器感到困惑,因为您还使用了双引号将字符串引起来。 为了显示:
puts "foo"bar"
# => SyntaxError: unexpected tIDENTIFIER, expecting end-of-input
# puts "foo"bar"
# ^
您可能打算打印foo"bar
,但是当解析器到达第二个"
(在foo
之后)时,它认为字符串已结束,因此它后面的内容会导致语法错误。 (Stack Overflow的语法高亮显示甚至给了您提示-查看第一行"foo"
的颜色与bar"
颜色不同吗?一个出色的语法高亮的文本编辑器将执行相同的操作。)
一种解决方案是改用单引号:
puts 'bar"baz'
# => bar"baz
在这种情况下,可以解决此问题,但实际上不会为您提供帮助,因为您的字符串中也包含单引号!
另一种解决方案是通过在\\
前面加上引号来转义引号,如下所示:
puts "foo\"bar"
# => foo"bar
...但是对于像您这样的长字符串,这会有点乏味(有时会很棘手)。 更好的解决方案是使用一种特殊的字符串,称为“ heredoc”(对于“ here document”而言,其价值):
str = <<-END_OF_HTML
<html> <meta content="text/html; charset=UTF-8"/> <body style='margin:20px'> <p>The following user has registered a device, click on the link below to review the user and make any changes if necessary.</p> <ul style='list-style-type:none; margin:25px 15px;'> <li><b>User name:</b> Test User</li> <li><b>User email:</b> test@abc.com</li> <li><b>Identifier:</b> abc123def132afd1213afas</li> <li><b>Description:</b> Tom's iPad</li> <li><b>Model:</b> iPad 3</li> <li><b>Platform:</b> </li> <li><b>App:</b> Test app name</li> <li><b>UserID:</b> </li> </ul> <p>Review user: https://cirrus.app47.com/users?search=test@abc.com</p> <hr style='height=2px; color:#aaa'/> <p>We hope you enjoy the app store experience!</p> <p style='font-size:18px; color:#999'>Powered by App47</p> <img src='https://cirrus.app47.com/notifications/562506219ac25b1033000904/img' alt=''/></body></html>
END_OF_HTML
html_doc = Nokogiri::HTML(str)
分隔符“ END_OF_HTML
”是任意的。 您可以使用EOF
或XYZZY
或任何适合您的想法,尽管使用有意义的东西是一个好主意。 (您会注意到,Stack Overflow的语法突出显示在heredocs上有一些麻烦;不过,大多数代码编辑器对此都很好。)
您可以像这样使它紧凑一些:
Nokogiri::HTML <<-END_OF_HTML
<html> <meta content="text/html; charset=UTF-8"/> <body style='margin:20px'> <p>The following user has registered a device, click on the link below to review the user and make any changes if necessary.</p> <ul style='list-style-type:none; margin:25px 15px;'> <li><b>User name:</b> Test User</li> <li><b>User email:</b> test@abc.com</li> <li><b>Identifier:</b> abc123def132afd1213afas</li> <li><b>Description:</b> Tom's iPad</li> <li><b>Model:</b> iPad 3</li> <li><b>Platform:</b> </li> <li><b>App:</b> Test app name</li> <li><b>UserID:</b> </li> </ul> <p>Review user: https://cirrus.app47.com/users?search=test@abc.com</p> <hr style='height=2px; color:#aaa'/> <p>We hope you enjoy the app store experience!</p> <p style='font-size:18px; color:#999'>Powered by App47</p> <img src='https://cirrus.app47.com/notifications/562506219ac25b1033000904/img' alt=''/></body></html>
END_OF_HTML
或带括号(看起来有些奇怪,但可以,有时是必需的):
Nokogiri::HTML(<<-END_OF_HTML)
<html> <meta content="text/html; charset=UTF-8"/> <body style='margin:20px'> <p>The following user has registered a device, click on the link below to review the user and make any changes if necessary.</p> <ul style='list-style-type:none; margin:25px 15px;'> <li><b>User name:</b> Test User</li> <li><b>User email:</b> test@abc.com</li> <li><b>Identifier:</b> abc123def132afd1213afas</li> <li><b>Description:</b> Tom's iPad</li> <li><b>Model:</b> iPad 3</li> <li><b>Platform:</b> </li> <li><b>App:</b> Test app name</li> <li><b>UserID:</b> </li> </ul> <p>Review user: https://cirrus.app47.com/users?search=test@abc.com</p> <hr style='height=2px; color:#aaa'/> <p>We hope you enjoy the app store experience!</p> <p style='font-size:18px; color:#999'>Powered by App47</p> <img src='https://cirrus.app47.com/notifications/562506219ac25b1033000904/img' alt=''/></body></html>
END_OF_HTML
您可以在Ruby文档的“ 文字”部分中阅读有关heredocs以及其他表示字符串的其他方式的信息。
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