``, the class should define the :meth:`do_tag` method. The module defines a parser class and an exception: .. class:: HTMLParser(formatter) This is the basic HTML parser class. It supports all entity names required by the XHTML 1.0 Recommendation (http://www.w3.org/TR/xhtml1). It also defines handlers for all HTML 2.0 and many HTML 3.0 and 3.2 elements. .. exception:: HTMLParseError Exception raised by the :class:`HTMLParser` class when it encounters an error while parsing. .. versionadded:: 2.4 .. seealso:: Module :mod:`formatter` Interface definition for transforming an abstract flow of formatting events into specific output events on writer objects. Module :mod:`HTMLParser` Alternate HTML parser that offers a slightly lower-level view of the input, but is designed to work with XHTML, and does not implement some of the SGML syntax not used in "HTML as deployed" and which isn't legal for XHTML. Module :mod:`htmlentitydefs` Definition of replacement text for XHTML 1.0 entities. Module :mod:`sgmllib` Base class for :class:`HTMLParser`. .. _html-parser-objects: HTMLParser Objects ------------------ In addition to tag methods, the :class:`HTMLParser` class provides some additional methods and instance variables for use within tag methods. .. attribute:: HTMLParser.formatter This is the formatter instance associated with the parser. .. attribute:: HTMLParser.nofill Boolean flag which should be true when whitespace should not be collapsed, or false when it should be. In general, this should only be true when character data is to be treated as "preformatted" text, as within a ``
`` element. The default value is false. This affects the operation of :meth:`handle_data` and :meth:`save_end`. .. method:: HTMLParser.anchor_bgn(href, name, type) This method is called at the start of an anchor region. The arguments correspond to the attributes of the ```` tag with the same names. The default implementation maintains a list of hyperlinks (defined by the ``HREF`` attribute for ```` tags) within the document. The list of hyperlinks is available as the data attribute :attr:`anchorlist`. .. method:: HTMLParser.anchor_end() This method is called at the end of an anchor region. The default implementation adds a textual footnote marker using an index into the list of hyperlinks created by :meth:`anchor_bgn`. .. method:: HTMLParser.handle_image(source, alt[, ismap[, align[, width[, height]]]]) This method is called to handle images. The default implementation simply passes the *alt* value to the :meth:`handle_data` method. .. method:: HTMLParser.save_bgn() Begins saving character data in a buffer instead of sending it to the formatter object. Retrieve the stored data via :meth:`save_end`. Use of the :meth:`save_bgn` / :meth:`save_end` pair may not be nested. .. method:: HTMLParser.save_end() Ends buffering character data and returns all data saved since the preceding call to :meth:`save_bgn`. If the :attr:`nofill` flag is false, whitespace is collapsed to single spaces. A call to this method without a preceding call to :meth:`save_bgn` will raise a :exc:`TypeError` exception. :mod:`htmlentitydefs` --- Definitions of HTML general entities ============================================================== .. module:: htmlentitydefs :synopsis: Definitions of HTML general entities. .. sectionauthor:: Fred L. Drake, Jr. .. note:: The :mod:`htmlentitydefs` module has been renamed to :mod:`html.entities` in Python 3.0. The :term:`2to3` tool will automatically adapt imports when converting your sources to 3.0. This module defines three dictionaries, ``name2codepoint``, ``codepoint2name``, and ``entitydefs``. ``entitydefs`` is used by the :mod:`htmllib` module to provide the :attr:`entitydefs` member of the :class:`HTMLParser` class. The definition provided here contains all the entities defined by XHTML 1.0 that can be handled using simple textual substitution in the Latin-1 character set (ISO-8859-1). .. data:: entitydefs A dictionary mapping XHTML 1.0 entity definitions to their replacement text in ISO Latin-1. .. data:: name2codepoint A dictionary that maps HTML entity names to the Unicode codepoints. .. versionadded:: 2.3 .. data:: codepoint2name A dictionary that maps Unicode codepoints to HTML entity names. .. versionadded:: 2.3
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