解析缺失标签的XML文件
我正在尝试解析一个xml文件。文件中标签里的文字可以成功解析(或者看起来是这样),但我想输出那些不在标签中的文字,而下面的程序却忽略了这些内容。
from xml.etree.ElementTree import XMLTreeBuilder
class HtmlLatex: # The target object of the parser
out = ''
var = ''
def start(self, tag, attrib): # Called for each opening tag.
pass
def end(self, tag): # Called for each closing tag.
if tag == 'i':
self.out += self.var
elif tag == 'sub':
self.out += '_{' + self.var + '}'
elif tag == 'sup':
self.out += '^{' + self.var + '}'
else:
self.out += self.var
def data(self, data):
self.var = data
def close(self):
print(self.out)
if __name__ == '__main__':
target = HtmlLatex()
parser = XMLTreeBuilder(target=target)
text = ''
with open('input.txt') as f1:
text = f1.read()
print(text)
parser.feed(text)
parser.close()
我想解析的输入的一部分是:
<p><i>p</i><sub>0</sub> = (<i>m</i><sup>3</sup>+(2<i>l</i><sub>2</sub>+<i>l</i><sub>1</sub>) <i>m</i><sup>2</sup>+(<i>l</i><sub>2</sub><sup>2</sup>+2<i>l</i><sub>1</sub> <i>l</i><sub>2</sub>+<i>l</i><sub>1</sub><sup>2</sup>) <i>m</i>) /(<i>m</i><sup>3</sup>+(3<i>l</i><sub>2</sub>+2<i>l</i><sub>1</sub>) ) }.</p>
2 个回答
3
看看这个BeautifulSoup,这是一个用Python写的库,可以帮助你解析、浏览和处理HTML和XML文件。它的界面很友好,可能能帮你解决问题……
2
这是一个使用pyparsing的版本——我希望注释能解释得够清楚。
src = """<p><i>p</i><sub>0</sub> = (<i>m</i><sup>3</sup>+(2<i>l</i><sub>2</sub>+<i>l</i><sub>1</sub>) """ \
"""<i>m</i><sup>2</sup>+(<i>l</i><sub>2</sub><sup>2</sup>+2<i>l</i><sub>1</sub> <i>l</i><sub>2</sub>+""" \
"""<i>l</i><sub>1</sub><sup>2</sup>) <i>m</i>) /(<i>m</i><sup>3</sup>+(3<i>l</i><sub>2</sub>+""" \
"""2<i>l</i><sub>1</sub>) ) }.</p>"""
from pyparsing import makeHTMLTags, anyOpenTag, anyCloseTag, Suppress, replaceWith
# set up tag matching for <sub> and <sup> tags
SUB,endSUB = makeHTMLTags("sub")
SUP,endSUP = makeHTMLTags("sup")
# all other tags will be suppressed from the output
ANY,endANY = map(Suppress,(anyOpenTag,anyCloseTag))
SUB.setParseAction(replaceWith("_{"))
SUP.setParseAction(replaceWith("^{"))
endSUB.setParseAction(replaceWith("}"))
endSUP.setParseAction(replaceWith("}"))
transformer = (SUB | endSUB | SUP | endSUP | ANY | endANY)
# now use the transformer to apply these transforms to the input string
print transformer.transformString(src)
结果是
p_{0} = (m^{3}+(2l_{2}+l_{1}) m^{2}+(l_{2}^{2}+2l_{1} l_{2}+l_{1}^{2}) m) /(m^{3}+(3l_{2}+2l_{1}) ) }.