Question

民间，

在Nokogiri 1.5.6上运行以下代码

require 'nokogiri'

reader = Nokogiri::XML::Reader(<<-eoxml)
<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
<node label="Session">              
  <node id="session_query1" label="DTM Buffer Size" />
  <node id="session_query2" label="Buffer Block Size"/>
  <node id="session_query3" label="Enable Test Load"/>
</node>
<node label="Workflow" >
 <node id="workflow_query1" label="Enable HA Recovery"/>
 <node id="workflow_query2" label="Suspend on Error"/>
</node>
<node label="Mapping" >
 <node id="mapping_query1" label="SQL Override in SQ " />
 <node id="mapping_query2" label="SQL Override in lookup" />               
</node>
</root>
eoxml

p reader.instance_of? Nokogiri::XML::Reader #true
p reader.xml_encoding #nil

有谁知道为什么xml_encoding返回“nil”？

Answer 1

查看代码，它是nil，因为您通过了nil：

def Reader string_or_io, url = nil, encoding = nil, options = ParseOptions::STRICT
  # ...
end

我猜这是因为Reader是一个基于事件的解析器，它并不总是有可用的信息所以需要它传入。

基于Document的解析具有：

require 'nokogiri'

p Nokogiri::VERSION

doc = Nokogiri::XML(<<-eoxml)
<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
<node label="Session">              
  <node id="session_query1" label="DTM Buffer Size" />
  <node id="session_query2" label="Buffer Block Size"/>
  <node id="session_query3" label="Enable Test Load"/>
</node>
<node label="Workflow" >
 <node id="workflow_query1" label="Enable HA Recovery"/>
 <node id="workflow_query2" label="Suspend on Error"/>
</node>
<node label="Mapping" >
 <node id="mapping_query1" label="SQL Override in SQ " />
 <node id="mapping_query2" label="SQL Override in lookup" />               
</node>
</root>
eoxml

p doc.encoding

Nokogiri :: XML :: Reader＃encoding给出“nil”

1 个答案: