Jav*_*ier 4 ruby parsing dom ruby-on-rails nokogiri
让Nokogiri选择start和stop元素之间的所有内容(包括start/stop-element)最聪明的方法是什么？
检查下面的示例代码,了解我在寻找什么:
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>
<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')
结果(返回值)应如下所示:
<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,但我认为必须有更聪明的东西:
@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
Mag*_*olm 10
一种使用递归的太聪明的oneliner:
def collect_between(first, last)
first == last ? [first] : [first, *collect_between(first.next, last)]
end
迭代解决方案:
def collect_between(first, last)
result = [first]
until first == last
first = first.next
result << first
end
result
end
编辑:(简短)解释星号
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])
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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