Nokogiri：选择元素A和B之间的内容 [英] Nokogiri: Select content between element A and B
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问题描述
在下面的示例代码中，选择Nokogiri在start和stop元素之间选择所有内容的最佳方法是什么？了解我在找什么：
require'rubygems'
require'nokogiri'
value = Nokogiri :: HTML.parse（<< -HTML_END）
< html>
< body>
< p id ='para-1'> ; A< / p>
< div class ='block'id ='X1'>
< p class =this> Foo< / p>
& p id ='para-2'> B< / p>
< / div>
< p id ='para-3'> C< / p>
< ; p class =that> Bar< / p>
< p id ='para-4'> D< / p>
< p id ='para-5'> ; E< / p>
< div class ='block'id ='X2'>
< p id ='para-6'> F< / p>
< / div>
< p id ='para-7'> F< / p>
& lt; p id ='para-8'> G< / p>
< / body>
< / html>
HTML_END
parent = value.css（'body'）。first
＃START元素
@start_element = parent.at（'p＃ para-3'）
＃STOP元素
@end_element = parent.at（'p＃para-7'）
结果（返回值）应该看起来像这样：
< p id ='para-3'> C< / p>
< p class =that> Bar< / p>
< p id ='para-4'> D< / p>
< p id ='para-5'> E< / p>
< div class ='block'id ='X2'>
< p id ='para-6'> F< / p>
< / div>
< p id ='para-7'> F< / p>
更新：这是我目前的解决方案，虽然我认为必须要更聪明： / strong>
@my_content =
@selected_node = true
def collect_content （_start）
如果_start == @end_element
@my_content<<<< _start.to_html
@selected_node = false
end
如果@selected_node == true
@my_content<<< _start.to_html
collect_content（_start.next）
end
end
collect_content（@start_element）
puts @ my_content
解决方案
使用递归的方式太聪明的oneliner
$ b
def collect_between（first，last）
first == last？ [第一]：[第一，* collect_between（first.next，last）]
end
一个迭代解决方案：
def collect_between（first，last）
result = [first]
until first == last
first = first.next
result<<<第一
结束
结果
结束
编辑： （短）解释asterix
它被称为splat运算符。它展开一个数组：
array = [3，2，1]
[4，array]＃ => [4，[3，2，1]]
[4，* array]＃=> [4，3，2，1]
some_method（array）＃=> some_method（[3，2，1]）$ b $ b some_method（* array）＃=> some_method（3，2，1）
def other_method（* array）;阵列; end
other_method（1，2，3）＃=> [1，2，3]
What's the smartest way to have Nokogiri select all content between the start and the stop element (including start-/stop-element)?
Check example code below to understand what I'm looking for:
require 'rubygems'
require 'nokogiri'
value = Nokogiri::HTML.parse(<<-HTML_END)
"<html>
<body>
<p id='para-1'>A</p>
<div class='block' id='X1'>
<p class="this">Foo</p>
<p id='para-2'>B</p>
</div>
<p id='para-3'>C</p>
<p class="that">Bar</p>
<p id='para-4'>D</p>
<p id='para-5'>E</p>
<div class='block' id='X2'>
<p id='para-6'>F</p>
</div>
<p id='para-7'>F</p>
<p id='para-8'>G</p>
</body>
</html>"
HTML_END
parent = value.css('body').first
# START element
@start_element = parent.at('p#para-3')
# STOP element
@end_element = parent.at('p#para-7')
The result (return value) should look like this:
<p id='para-3'>C</p>
<p class="that">Bar</p>
<p id='para-4'>D</p>
<p id='para-5'>E</p>
<div class='block' id='X2'>
<p id='para-6'>F</p>
</div>
<p id='para-7'>F</p>
Update: This is my current solution, though I think there must be something smarter:
@my_content = ""
@selected_node = true
def collect_content(_start)
if _start == @end_element
@my_content << _start.to_html
@selected_node = false
end
if @selected_node == true
@my_content << _start.to_html
collect_content(_start.next)
end
end
collect_content(@start_element)
puts @my_content
解决方案
A way-too-smart oneliner which uses recursion:
def collect_between(first, last)
first == last ? [first] : [first, *collect_between(first.next, last)]
end
An iterative solution:
def collect_between(first, last)
result = [first]
until first == last
first = first.next
result << first
end
result
end
EDIT: (Short) explanation of the asterix
It's called the splat operator. It "unrolls" an array:
array = [3, 2, 1]
[4, array] # => [4, [3, 2, 1]]
[4, *array] # => [4, 3, 2, 1]
some_method(array) # => some_method([3, 2, 1])
some_method(*array) # => some_method(3, 2, 1)
def other_method(*array); array; end
other_method(1, 2, 3) # => [1, 2, 3]
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