# -*- coding: utf-8 -*-
#python 27
#xiaodeng
#python模块之HTMLParser(原理很大程度上就是对类构造的熟练运用) import HTMLParser
#tag是的html标签，attrs是 (属性，值)元组(tuple)的列表(list)。
#HTMLParser自动将tag和attrs都转为小写 '''
>>> help(HTMLParser)
Help on module HTMLParser:
CLASSES
exceptions.Exception(exceptions.BaseException)
HTMLParseError
markupbase.ParserBase
HTMLParser class HTMLParser(markupbase.ParserBase)
| Find tags and other markup and call handler functions.
|
| Usage:
| p = HTMLParser()#初始化
| p.feed(data)#feed()方法可以多次调用，也就是不一定一次把整个HTML字符串都塞进去，可以一部分一部分塞进去
#提供一些文本给解析器。在由完整元素组成的限度内进行处理，不完整的数据被缓冲直到更多的数据提供或者close()被调用
| ...
| p.close()
|
| Methods defined here:
|
| __init__(self)
| Initialize and reset this instance.
|
| check_for_whole_start_tag(self, i)
| # Internal -- check to see if we have a complete starttag; return end
| # or -1 if incomplete.
|
| clear_cdata_mode(self)
|
| close(self)
| Handle any buffered data.
|
| error(self, message)
|
| feed(self, data) #向分析器提供数据。
| Feed data to the parser.
|
| Call this as often as you want, with as little or as much text
| as you want (may include '\n').
|
| get_starttag_text(self)
| Return full source of start tag: '<...>'.
|
| goahead(self, end)
| # Internal -- handle data as far as reasonable. May leave state
| # and data to be processed by a subsequent call. If 'end' is
| # true, force handling all data as if followed by EOF marker.
|
| handle_charref(self, name) #处理特殊字符串，就是以&#开头的，一般是内码表示的字符
| # Overridable -- handle character reference
|
| handle_comment(self, data) #处理注释，处理<!--comment-->内的内容
| # Overridable -- handle comment
|
| handle_data(self, data) #处理数据，就是<xx>data</xx>中间的那些数据
| # Overridable -- handle data
|
| handle_decl(self, decl) #处理<!开头的，比如<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
| #文档类型声明，
# Overridable -- handle declaration
|
| handle_endtag(self, tag) #处理结束标签，</xx>
| # Overridable -- handle end tag
|
| handle_entityref(self, name) #处理一些特殊字符，以&开头的
| # Overridable -- handle entity reference
|
| handle_pi(self, data) #处理形如<?instruction>的东西
| # Overridable -- handle processing instruction
|
| handle_startendtag(self, tag, attrs) #处理开始标签和结束标签
| # Overridable -- finish processing of start+end tag: <tag.../>
|
| handle_starttag(self, tag, attrs) # 处理开始标签，比如<xx>
| # Overridable -- handle start tag
|
| parse_bogus_comment(self, i, report=1)
| # Internal -- parse bogus comment, return length or -1 if not terminated
| # see http://www.w3.org/TR/html5/tokenization.html#bogus-comment-state
|
| parse_endtag(self, i)
| # Internal -- parse endtag, return end or -1 if incomplete
|
| parse_html_declaration(self, i)
| # Internal -- parse html declarations, return length or -1 if not terminated
| # See w3.org/TR/html5/tokenization.html#markup-declaration-open-state
| # See also parse_declaration in _markupbase
|
| parse_pi(self, i)
| # Internal -- parse processing instr, return end or -1 if not terminated
|
| parse_starttag(self, i)
| # Internal -- handle starttag, return end or -1 if not terminated
|
| reset(self)
| Reset this instance. Loses all unprocessed data.
|
| set_cdata_mode(self, elem)
|
| unescape(self, s)
|
| unknown_decl(self, data)
|
| ----------------------------------------------------------------------
| Data and other attributes defined here:
|
| CDATA_CONTENT_ELEMENTS = ('script', 'style')
|
| entitydefs = None
|
| ----------------------------------------------------------------------
| Methods inherited from markupbase.ParserBase:
|
| getpos(self)
| Return current line number and offset.
|
| parse_comment(self, i, report=1)
| # Internal -- parse comment, return length or -1 if not terminated
|
| parse_declaration(self, i)
| # Internal -- parse declaration (for use by subclasses).
|
| parse_marked_section(self, i, report=1)
| # Internal -- parse a marked section
| # Override this to handle MS-word extension syntax <![if word]>content<![endif]>
|
| updatepos(self, i, j)
| # Internal -- update line number and offset. This should be
| # called for each piece of data exactly once, in order -- in other
| # words the concatenation of all the input strings to this
| # function should be exactly the entire input. >>>
'''