在操作 XML 时,我希望尽可能地保留注释。
我成功地保留了注释,但是内容被转义成了 XML。
#!/usr/bin/env python
# add_host_to_tomcat.py
import xml.etree.ElementTree as ET
from CommentedTreeBuilder import CommentedTreeBuilder
parser = CommentedTreeBuilder()
if __name__ == '__main__':
filename = "/opt/lucee/tomcat/conf/server.xml"
# this is the important part: use the comment-preserving parser
tree = ET.parse(filename, parser)
# get the node to add a child to
engine_node = tree.find("./Service/Engine")
# add a node: Engine.Host
host_node = ET.SubElement(
engine_node,
"Host",
name="local.mysite.com",
appBase="webapps"
)
# add a child to new node: Engine.Host.Context
ET.SubElement(
host_node,
'Context',
path="",
docBase="/path/to/doc/base"
)
tree.write('out.xml')
#!/usr/bin/env python
# CommentedTreeBuilder.py
from xml.etree import ElementTree
class CommentedTreeBuilder ( ElementTree.XMLTreeBuilder ):
def __init__ ( self, html = 0, target = None ):
ElementTree.XMLTreeBuilder.__init__( self, html, target )
self._parser.CommentHandler = self.handle_comment
def handle_comment ( self, data ):
self._target.start( ElementTree.Comment, {} )
self._target.data( data )
self._target.end( ElementTree.Comment )
然而,像这样的评论:
<!--
EXAMPLE HOST ENTRY:
<Host name="lucee.org" appBase="webapps">
<Context path="" docBase="/var/sites/getrailo.org" />
<Alias>www.lucee.org</Alias>
<Alias>my.lucee.org</Alias>
</Host>
HOST ENTRY TEMPLATE:
<Host name="[ENTER DOMAIN NAME]" appBase="webapps">
<Context path="" docBase="[ENTER SYSTEM PATH]" />
<Alias>[ENTER DOMAIN ALIAS]</Alias>
</Host>
-->
最终成为:
<!--
EXAMPLE HOST ENTRY:
<Host name="lucee.org" appBase="webapps">
<Context path="" docBase="/var/sites/getrailo.org" />
<Alias>www.lucee.org</Alias>
<Alias>my.lucee.org</Alias>
</Host>
HOST ENTRY TEMPLATE:
<Host name="[ENTER DOMAIN NAME]" appBase="webapps">
<Context path="" docBase="[ENTER SYSTEM PATH]" />
<Alias>[ENTER DOMAIN ALIAS]</Alias>
</Host>
-->
我也尝试在 CommentedTreeBuilder.py
中使用了 self._target.data( saxutils.unescape(data) )
,但好像没有起作用。事实上,我认为问题发生在 handle_comment()
步骤之后。
顺便说一句,这个问题类似于这个。