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<div class="chapter" lang="zh_cn">
<div class="titlepage">
<div>
<div>
<h2 class="title"><a name="dialect"></a>第 8 章 <span class="acronym">HTML</span> 处理
</h2>
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<div></div>
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<div class="toc">
<ul>
<li><span class="section"><a href="index.html#dialect.divein">8.1. 概览</a></span></li>
<li><span class="section"><a href="introducing_sgmllib.html">8.2. sgmllib.py 介绍</a></span></li>
<li><span class="section"><a href="extracting_data.html">8.3. 从 HTML 文档中提取数据</a></span></li>
<li><span class="section"><a href="basehtmlprocessor.html">8.4. BaseHTMLProcessor.py 介绍</a></span></li>
<li><span class="section"><a href="locals_and_globals.html">8.5. locals 和 globals</a></span></li>
<li><span class="section"><a href="dictionary_based_string_formatting.html">8.6. 基于 dictionary 的字符串格式化</a></span></li>
<li><span class="section"><a href="quoting_attribute_values.html">8.7. 给属性值加引号</a></span></li>
<li><span class="section"><a href="dialect.html">8.8. dialect.py 介绍</a></span></li>
<li><span class="section"><a href="all_together.html">8.9. 全部放在一起</a></span></li>
<li><span class="section"><a href="summary.html">8.10. 小结</a></span></li>
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<div class="titlepage">
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<div>
<h2 class="title"><a name="dialect.divein"></a>8.1. 概览
</h2>
</div>
</div>
<div></div>
</div>
<div class="abstract">
<p>
我经常在 <a href="http://groups.google.com/groups?group=comp.lang.python">comp.lang.python</a> 上看到关于如下的问题： “<span class="quote"> 怎么才能从我的 <span class="acronym">HTML</span> 文档中列出所有的 [头|图像|链接] 呢？</span>” “<span class="quote">怎么才能 [分析|解释|munge] 我的 <span class="acronym">HTML</span> 文档的文本，但是又要保留标记呢？</span>” “<span class="quote">怎么才能一次给我所有的 <span class="acronym">HTML</span> 标记 [增加|删除|加引号] 属性呢？</span>” 本章将回答所有这些问题。
</p>
</div>
<p>下面给出一个完整的，可工作的 <span class="application">Python</span> 程序，它分为两部分。第一部分，<tt class="filename">BaseHTMLProcessor.py</tt> 是一个通用工具，它可以通过扫描标记和文本块来帮助您处理 <span class="acronym">HTML</span> 文件。第二部分，<tt class="filename">dialect.py</tt> 是一个例子，演示了如何使用 <tt class="filename">BaseHTMLProcessor.py</tt> 来转化 <span class="acronym">HTML</span> 文档，保留文本但是去掉了标记。阅读文档字符串 (<tt class="literal">doc string</tt>) 和注释来了解将要发生事情的概况。大部分内容看上去像巫术，因为任一个这些类的方法是如何调用的不是很清楚。不要紧，所有内容都会按进度被逐步地展示出来。
</p>
<div class="example"><a name="dialect.basehtml.listing"></a><h3 class="title">例 8.1. <tt class="filename">BaseHTMLProcessor.py</tt></h3>
<p>如果您还没有下载本书附带的样例程序, 可以 <a href="http://www.woodpecker.org.cn/diveintopython/download/diveintopython-exampleszh-cn-5.4b.zip" title="Download example scripts">下载本程序和其他样例程序</a>。
</p><pre class="programlisting"><span class='pykeyword'>
from</span> sgmllib <span class='pykeyword'>import</span> SGMLParser
<span class='pykeyword'>import</span> htmlentitydefs
<span class='pykeyword'>class</span><span class='pyclass'> BaseHTMLProcessor</span>(SGMLParser):
<span class='pykeyword'>def</span><span class='pyclass'> reset</span>(self):
<span class='pycomment'># extend (called by SGMLParser.__init__)</span>
self.pieces = []
SGMLParser.reset(self)
<span class='pykeyword'>def</span><span class='pyclass'> unknown_starttag</span>(self, tag, attrs):
<span class='pycomment'># called for each start tag</span>
<span class='pycomment'># attrs is a list of (attr, value) tuples</span>
<span class='pycomment'># e.g. for <pre class="screen">, tag="pre", attrs=[("class", "screen")]</span>
<span class='pycomment'># Ideally we would like to reconstruct original tag and attributes, but</span>
<span class='pycomment'># we may end up quoting attribute values that weren't quoted in the source</span>
<span class='pycomment'># document, or we may change the type of quotes around the attribute value</span>
<span class='pycomment'># (single to double quotes).</span>
<span class='pycomment'># Note that improperly embedded non-HTML code (like client-side Javascript)</span>
<span class='pycomment'># may be parsed incorrectly by the ancestor, causing runtime script errors.</span>
<span class='pycomment'># All non-HTML code must be enclosed in HTML comment tags (<!-- code -->)</span>
<span class='pycomment'># to ensure that it will pass through this parser unaltered (in handle_comment).</span>
strattrs = <span class='pystring'>""</span>.join([<span class='pystring'>' %s="%s"'</span> % (key, value) <span class='pykeyword'>for</span> key, value <span class='pykeyword'>in</span> attrs])
self.pieces.append(<span class='pystring'>"<%(tag)s%(strattrs)s>"</span> % locals())
<span class='pykeyword'>def</span><span class='pyclass'> unknown_endtag</span>(self, tag):
<span class='pycomment'># called for each end tag, e.g. for </pre>, tag will be "pre"</span>
<span class='pycomment'># Reconstruct the original end tag.</span>
self.pieces.append(<span class='pystring'>"</%(tag)s>"</span> % locals())
<span class='pykeyword'>def</span><span class='pyclass'> handle_charref</span>(self, ref):
<span class='pycomment'># called for each character reference, e.g. for "&#160;", ref will be "160"</span>
<span class='pycomment'># Reconstruct the original character reference.</span>
self.pieces.append(<span class='pystring'>"&#%(ref)s;"</span> % locals())
<span class='pykeyword'>def</span><span class='pyclass'> handle_entityref</span>(self, ref):
<span class='pycomment'># called for each entity reference, e.g. for "&copy;", ref will be "copy"</span>
<span class='pycomment'># Reconstruct the original entity reference.</span>
self.pieces.append(<span class='pystring'>"&%(ref)s"</span> % locals())
<span class='pycomment'># standard HTML entities are closed with a semicolon; other entities are not</span>
<span class='pykeyword'>if</span> htmlentitydefs.entitydefs.has_key(ref):
self.pieces.append(<span class='pystring'>";"</span>)
<span class='pykeyword'>def</span><span class='pyclass'> handle_data</span>(self, text):
<span class='pycomment'># called for each block of plain text, i.e. outside of any tag and</span>
<span class='pycomment'># not containing any character or entity references</span>
<span class='pycomment'># Store the original text verbatim.</span>
self.pieces.append(text)
<span class='pykeyword'>def</span><span class='pyclass'> handle_comment</span>(self, text):
<span class='pycomment'># called for each HTML comment, e.g. <!-- insert Javascript code here --></span>
<span class='pycomment'># Reconstruct the original comment.</span>
<span class='pycomment'># It is especially important that the source document enclose client-side</span>
<span class='pycomment'># code (like Javascript) within comments so it can pass through this</span>
<span class='pycomment'># processor undisturbed; see comments in unknown_starttag for details.</span>
self.pieces.append(<span class='pystring'>"<!--%(text)s-->"</span> % locals())
<span class='pykeyword'>def</span><span class='pyclass'> handle_pi</span>(self, text):
<span class='pycomment'># called for each processing instruction, e.g. <?instruction></span>
<span class='pycomment'># Reconstruct original processing instruction.</span>
self.pieces.append(<span class='pystring'>"<?%(text)s>"</span> % locals())
<span class='pykeyword'>def</span><span class='pyclass'> handle_decl</span>(self, text):
<span class='pycomment'># called for the DOCTYPE, if present, e.g.</span>
<span class='pycomment'># <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"</span>
<span class='pycomment'># "http://www.w3.org/TR/html4/loose.dtd"></span>
<span class='pycomment'># Reconstruct original DOCTYPE</span>
self.pieces.append(<span class='pystring'>"<!%(text)s>"</span> % locals())
<span class='pykeyword'>def</span><span class='pyclass'> output</span>(self):
<span class='pystring'>"""Return processed HTML as a single string"""</span>
<span class='pykeyword'>return</span> <span class='pystring'>""</span>.join(self.pieces)</pre></div>
<div class="example"><a name="d0e19875"></a><h3 class="title">例 8.2. <tt class="filename">dialect.py</tt></h3><pre class="programlisting"><span class='pykeyword'>
import</span> re
<span class='pykeyword'>from</span> BaseHTMLProcessor <span class='pykeyword'>import</span> BaseHTMLProcessor
<span class='pykeyword'>class</span><span class='pyclass'> Dialectizer</span>(BaseHTMLProcessor):
subs = ()
<span class='pykeyword'>def</span><span class='pyclass'> reset</span>(self):
<span class='pycomment'># extend (called from __init__ in ancestor)</span>
<span class='pycomment'># Reset all data attributes</span>
self.verbatim = 0
BaseHTMLProcessor.reset(self)
<span class='pykeyword'>def</span><span class='pyclass'> start_pre</span>(self, attrs):
<span class='pycomment'># called for every <pre> tag in HTML source</span>
<span class='pycomment'># Increment verbatim mode count, then handle tag like normal</span>
self.verbatim += 1
self.unknown_starttag(<span class='pystring'>"pre"</span>, attrs)
<span class='pykeyword'>def</span><span class='pyclass'> end_pre</span>(self):
<span class='pycomment'># called for every </pre> tag in HTML source</span>
<span class='pycomment'># Decrement verbatim mode count</span>
self.unknown_endtag(<span class='pystring'>"pre"</span>)
self.verbatim -= 1
<span class='pykeyword'>def</span><span class='pyclass'> handle_data</span>(self, text):
<span class='pycomment'># override</span>
<span class='pycomment'># called for every block of text in HTML source</span>
<span class='pycomment'># If in verbatim mode, save text unaltered;</span>
<span class='pycomment'># otherwise process the text with a series of substitutions</span>
self.pieces.append(self.verbatim <span class='pykeyword'>and</span> text <span class='pykeyword'>or</span> self.process(text))
<span class='pykeyword'>def</span><span class='pyclass'> process</span>(self, text):
<span class='pycomment'># called from handle_data</span>
<span class='pycomment'># Process text block by performing series of regular expression</span>
<span class='pycomment'># substitutions (actual substitions are defined in descendant)</span>
<span class='pykeyword'>for</span> fromPattern, toPattern <span class='pykeyword'>in</span> self.subs:
text = re.sub(fromPattern, toPattern, text)
<span class='pykeyword'>return</span> text
<span class='pykeyword'>class</span><span class='pyclass'> ChefDialectizer</span>(Dialectizer):
<span class='pystring'>"""convert HTML to Swedish Chef-speak
based on the classic chef.x, copyright (c) 1992, 1993 John Hagerman
"""</span>
subs = ((r<span class='pystring'>'a([nu])'</span>, r<span class='pystring'>'u\1'</span>),
(r<span class='pystring'>'A([nu])'</span>, r<span class='pystring'>'U\1'</span>),
(r<span class='pystring'>'a\B'</span>, r<span class='pystring'>'e'</span>),
(r<span class='pystring'>'A\B'</span>, r<span class='pystring'>'E'</span>),
(r<span class='pystring'>'en\b'</span>, r<span class='pystring'>'ee'</span>),
(r<span class='pystring'>'\Bew'</span>, r<span class='pystring'>'oo'</span>),
(r<span class='pystring'>'\Be\b'</span>, r<span class='pystring'>'e-a'</span>),
(r<span class='pystring'>'\be'</span>, r<span class='pystring'>'i'</span>),
(r<span class='pystring'>'\bE'</span>, r<span class='pystring'>'I'</span>),
(r<span class='pystring'>'\Bf'</span>, r<span class='pystring'>'ff'</span>),
(r<span class='pystring'>'\Bir'</span>, r<span class='pystring'>'ur'</span>),
(r<span class='pystring'>'(\w*?)i(\w*?)$'</span>, r<span class='pystring'>'\1ee\2'</span>),
(r<span class='pystring'>'\bow'</span>, r<span class='pystring'>'oo'</span>),
(r<span class='pystring'>'\bo'</span>, r<span class='pystring'>'oo'</span>),
(r<span class='pystring'>'\bO'</span>, r<span class='pystring'>'Oo'</span>),
(r<span class='pystring'>'the'</span>, r<span class='pystring'>'zee'</span>),
(r<span class='pystring'>'The'</span>, r<span class='pystring'>'Zee'</span>),
(r<span class='pystring'>'th\b'</span>, r<span class='pystring'>'t'</span>),
(r<span class='pystring'>'\Btion'</span>, r<span class='pystring'>'shun'</span>),
(r<span class='pystring'>'\Bu'</span>, r<span class='pystring'>'oo'</span>),
(r<span class='pystring'>'\BU'</span>, r<span class='pystring'>'Oo'</span>),
(r<span class='pystring'>'v'</span>, r<span class='pystring'>'f'</span>),
(r<span class='pystring'>'V'</span>, r<span class='pystring'>'F'</span>),
(r<span class='pystring'>'w'</span>, r<span class='pystring'>'w'</span>),
(r<span class='pystring'>'W'</span>, r<span class='pystring'>'W'</span>),
(r<span class='pystring'>'([a-z])[.]'</span>, r<span class='pystring'>'\1. Bork Bork Bork!'</span>))
<span class='pykeyword'>class</span><span class='pyclass'> FuddDialectizer</span>(Dialectizer):
<span class='pystring'>"""convert HTML to Elmer Fudd-speak"""</span>
subs = ((r<span class='pystring'>'[rl]'</span>, r<span class='pystring'>'w'</span>),
(r<span class='pystring'>'qu'</span>, r<span class='pystring'>'qw'</span>),
(r<span class='pystring'>'th\b'</span>, r<span class='pystring'>'f'</span>),
(r<span class='pystring'>'th'</span>, r<span class='pystring'>'d'</span>),
(r<span class='pystring'>'n[.]'</span>, r<span class='pystring'>'n, uh-hah-hah-hah.'</span>))
<span class='pykeyword'>class</span><span class='pyclass'> OldeDialectizer</span>(Dialectizer):
<span class='pystring'>"""convert HTML to mock Middle English"""</span>
subs = ((r<span class='pystring'>'i([bcdfghjklmnpqrstvwxyz])e\b'</span>, r<span class='pystring'>'y\1'</span>),
(r<span class='pystring'>'i([bcdfghjklmnpqrstvwxyz])e'</span>, r<span class='pystring'>'y\1\1e'</span>),
(r<span class='pystring'>'ick\b'</span>, r<span class='pystring'>'yk'</span>),
(r<span class='pystring'>'ia([bcdfghjklmnpqrstvwxyz])'</span>, r<span class='pystring'>'e\1e'</span>),
(r<span class='pystring'>'e[ea]([bcdfghjklmnpqrstvwxyz])'</span>, r<span class='pystring'>'e\1e'</span>),
(r<span class='pystring'>'([bcdfghjklmnpqrstvwxyz])y'</span>, r<span class='pystring'>'\1ee'</span>),
(r<span class='pystring'>'([bcdfghjklmnpqrstvwxyz])er'</span>, r<span class='pystring'>'\1re'</span>),
(r<span class='pystring'>'([aeiou])re\b'</span>, r<span class='pystring'>'\1r'</span>),
(r<span class='pystring'>'ia([bcdfghjklmnpqrstvwxyz])'</span>, r<span class='pystring'>'i\1e'</span>),
(r<span class='pystring'>'tion\b'</span>, r<span class='pystring'>'cioun'</span>),
(r<span class='pystring'>'ion\b'</span>, r<span class='pystring'>'ioun'</span>),
(r<span class='pystring'>'aid'</span>, r<span class='pystring'>'ayde'</span>),
(r<span class='pystring'>'ai'</span>, r<span class='pystring'>'ey'</span>),
(r<span class='pystring'>'ay\b'</span>, r<span class='pystring'>'y'</span>),
(r<span class='pystring'>'ay'</span>, r<span class='pystring'>'ey'</span>),
(r<span class='pystring'>'ant'</span>, r<span class='pystring'>'aunt'</span>),
(r<span class='pystring'>'ea'</span>, r<span class='pystring'>'ee'</span>),
(r<span class='pystring'>'oa'</span>, r<span class='pystring'>'oo'</span>),
(r<span class='pystring'>'ue'</span>, r<span class='pystring'>'e'</span>),
(r<span class='pystring'>'oe'</span>, r<span class='pystring'>'o'</span>),
(r<span class='pystring'>'ou'</span>, r<span class='pystring'>'ow'</span>),
(r<span class='pystring'>'ow'</span>, r<span class='pystring'>'ou'</span>),
(r<span class='pystring'>'\bhe'</span>, r<span class='pystring'>'hi'</span>),
(r<span class='pystring'>'ve\b'</span>, r<span class='pystring'>'veth'</span>),
(r<span class='pystring'>'se\b'</span>, r<span class='pystring'>'e'</span>),
(r<span class='pystring'>"'s\b"</span>, r<span class='pystring'>'es'</span>),
(r<span class='pystring'>'ic\b'</span>, r<span class='pystring'>'ick'</span>),
(r<span class='pystring'>'ics\b'</span>, r<span class='pystring'>'icc'</span>),
(r<span class='pystring'>'ical\b'</span>, r<span class='pystring'>'ick'</span>),
(r<span class='pystring'>'tle\b'</span>, r<span class='pystring'>'til'</span>),
(r<span class='pystring'>'ll\b'</span>, r<span class='pystring'>'l'</span>),
(r<span class='pystring'>'ould\b'</span>, r<span class='pystring'>'olde'</span>),
(r<span class='pystring'>'own\b'</span>, r<span class='pystring'>'oune'</span>),
(r<span class='pystring'>'un\b'</span>, r<span class='pystring'>'onne'</span>),
(r<span class='pystring'>'rry\b'</span>, r<span class='pystring'>'rye'</span>),
(r<span class='pystring'>'est\b'</span>, r<span class='pystring'>'este'</span>),
(r<span class='pystring'>'pt\b'</span>, r<span class='pystring'>'pte'</span>),
(r<span class='pystring'>'th\b'</span>, r<span class='pystring'>'the'</span>),
(r<span class='pystring'>'ch\b'</span>, r<span class='pystring'>'che'</span>),
(r<span class='pystring'>'ss\b'</span>, r<span class='pystring'>'sse'</span>),
(r<span class='pystring'>'([wybdp])\b'</span>, r<span class='pystring'>'\1e'</span>),
(r<span class='pystring'>'([rnt])\b'</span>, r<span class='pystring'>'\1\1e'</span>),
(r<span class='pystring'>'from'</span>, r<span class='pystring'>'fro'</span>),
(r<span class='pystring'>'when'</span>, r<span class='pystring'>'whan'</span>))
<span class='pykeyword'>def</span><span class='pyclass'> translate</span>(url, dialectName=<span class='pystring'>"chef"</span>):
<span class='pystring'>"""fetch URL and translate using dialect
dialect in ("chef", "fudd", "olde")"""</span>
<span class='pykeyword'>import</span> urllib
sock = urllib.urlopen(url)
htmlSource = sock.read()
sock.close()
parserName = <span class='pystring'>"%sDialectizer"</span> % dialectName.capitalize()
parserClass = globals()[parserName]
parser = parserClass()
parser.feed(htmlSource)
parser.close()
<span class='pykeyword'>return</span> parser.output()
<span class='pykeyword'>def</span><span class='pyclass'> test</span>(url):
<span class='pystring'>"""test all dialects against URL"""</span>
<span class='pykeyword'>for</span> dialect <span class='pykeyword'>in</span> (<span class='pystring'>"chef"</span>, <span class='pystring'>"fudd"</span>, <span class='pystring'>"olde"</span>):
outfile = <span class='pystring'>"%s.html"</span> % dialect
fsock = open(outfile, <span class='pystring'>"wb"</span>)
fsock.write(translate(url, dialect))
fsock.close()
<span class='pykeyword'>import</span> webbrowser
webbrowser.open_new(outfile)
<span class='pykeyword'>if</span> __name__ == <span class='pystring'>"__main__"</span>:
test(<span class='pystring'>"http://diveintopython.org/odbchelper_list.html"</span>)</pre></div>
<div class="example"><a name="d0e19881"></a><h3 class="title">例 8.3. <tt class="filename">dialect.py</tt> 的输出结果
</h3>
<p>运行这个脚本会将 <a href="../native_data_types/lists.html" title="3.2. List 介绍">第 3.2 节 “List 介绍”</a> 转换成<a href="../native_data_types/chef.html">模仿瑞典厨师用语 (mock Swedish Chef-speak)</a> (来自 The Muppets)、<a href="../native_data_types/fudd.html">模仿埃尔默唠叨者用语 (mock Elmer Fudd-speak)</a> (来自 Bugs Bunny 卡通画) 和<a href="../native_data_types/olde.html">模仿中世纪英语 (mock Middle English)</a> (零散地来源于乔叟的<i class="citetitle">《坎特伯雷故事集》</i>)。如果您查看输出页面的 <span class="acronym">HTML</span> 源代码，您会发现所有的 <span class="acronym">HTML</span> 标记和属性没有改动，但是在标记之间的文本被转换成模仿语言了。如果您观查得更仔细些，您会发现，实际上，仅有标题和段落被转换了；代码列表和屏幕例子没有改动。
</p><pre class="programlisting">
<div <span class='pykeyword'>class</span>="<span class='pyclass'>abstract</span>">
<p>Lists awe <span <span class='pykeyword'>class</span>="<span class='pyclass'>application</span>">Pydon</span>'s wowkhowse datatype.
If youw onwy expewience wif wists <span class='pykeyword'>is</span> awways <span class='pykeyword'>in</span>
<span <span class='pykeyword'>class</span>="<span class='pyclass'>application</span>">Visuaw Basic</span> ow (God fowbid) de datastowe
<span class='pykeyword'>in</span> <span <span class='pykeyword'>class</span>="<span class='pyclass'>application</span>">Powewbuiwdew</span>, bwace youwsewf fow
<span <span class='pykeyword'>class</span>="<span class='pyclass'>application</span>">Pydon</span> wists.</p>
</div>
</pre></div>
</div>
</div>
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