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author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
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1 \section{Standard Module \sectcode{htmllib}}
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2 \stmodindex{htmllib}
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3 \index{HTML}
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4 \index{hypertext}
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5
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6 \renewcommand{\indexsubitem}{(in module htmllib)}
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7
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8 This module defines a class which can serve as a base for parsing text
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9 files formatted in the HyperText Mark-up Language (HTML). The class
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10 is not directly concerned with I/O --- it must be provided with input
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11 in string form via a method, and makes calls to methods of a
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12 ``formatter'' object in order to produce output. The
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13 \code{HTMLParser} class is designed to be used as a base class for
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14 other classes in order to add functionality, and allows most of its
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15 methods to be extended or overridden. In turn, this class is derived
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16 from and extends the \code{SGMLParser} class defined in module
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17 \code{sgmllib}. Two implementations of formatter objects are
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18 provided in the \code{formatter} module; refer to the documentation
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19 for that module for information on the formatter interface.
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20 \index{SGML}
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21 \stmodindex{sgmllib}
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22 \ttindex{SGMLParser}
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23 \index{formatter}
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24 \stmodindex{formatter}
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25
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26 The following is a summary of the interface defined by
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27 \code{sgmllib.SGMLParser}:
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28
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29 \begin{itemize}
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30
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31 \item
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32 The interface to feed data to an instance is through the \code{feed()}
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33 method, which takes a string argument. This can be called with as
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34 little or as much text at a time as desired; \code{p.feed(a);
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35 p.feed(b)} has the same effect as \code{p.feed(a+b)}. When the data
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36 contains complete HTML tags, these are processed immediately;
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37 incomplete elements are saved in a buffer. To force processing of all
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38 unprocessed data, call the \code{close()} method.
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39
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40 For example, to parse the entire contents of a file, use:
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41 \begin{verbatim}
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42 parser.feed(open('myfile.html').read())
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43 parser.close()
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44 \end{verbatim}
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45
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46 \item
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47 The interface to define semantics for HTML tags is very simple: derive
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48 a class and define methods called \code{start_\var{tag}()},
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49 \code{end_\var{tag}()}, or \code{do_\var{tag}()}. The parser will
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50 call these at appropriate moments: \code{start_\var{tag}} or
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51 \code{do_\var{tag}} is called when an opening tag of the form
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52 \code{<\var{tag} ...>} is encountered; \code{end_\var{tag}} is called
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53 when a closing tag of the form \code{<\var{tag}>} is encountered. If
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54 an opening tag requires a corresponding closing tag, like \code{<H1>}
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55 ... \code{</H1>}, the class should define the \code{start_\var{tag}}
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56 method; if a tag requires no closing tag, like \code{<P>}, the class
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57 should define the \code{do_\var{tag}} method.
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58
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59 \end{itemize}
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60
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61 The module defines a single class:
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62
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63 \begin{funcdesc}{HTMLParser}{formatter}
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64 This is the basic HTML parser class. It supports all entity names
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65 required by the HTML 2.0 specification (RFC 1866). It also defines
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66 handlers for all HTML 2.0 and many HTML 3.0 and 3.2 elements.
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67 \end{funcdesc}
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68
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69 In addition to tag methods, the \code{HTMLParser} class provides some
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70 additional methods and instance variables for use within tag methods.
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71
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72 \renewcommand{\indexsubitem}{({\tt HTMLParser} method)}
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73
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74 \begin{datadesc}{formatter}
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75 This is the formatter instance associated with the parser.
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76 \end{datadesc}
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77
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78 \begin{datadesc}{nofill}
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79 Boolean flag which should be true when whitespace should not be
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80 collapsed, or false when it should be. In general, this should only
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81 be true when character data is to be treated as ``preformatted'' text,
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82 as within a \code{<PRE>} element. The default value is false. This
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83 affects the operation of \code{handle_data()} and \code{save_end()}.
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84 \end{datadesc}
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85
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86 \begin{funcdesc}{anchor_bgn}{href\, name\, type}
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87 This method is called at the start of an anchor region. The arguments
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88 correspond to the attributes of the \code{<A>} tag with the same
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89 names. The default implementation maintains a list of hyperlinks
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90 (defined by the \code{href} argument) within the document. The list
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91 of hyperlinks is available as the data attribute \code{anchorlist}.
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92 \end{funcdesc}
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93
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94 \begin{funcdesc}{anchor_end}{}
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95 This method is called at the end of an anchor region. The default
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96 implementation adds a textual footnote marker using an index into the
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97 list of hyperlinks created by \code{anchor_bgn()}.
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98 \end{funcdesc}
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99
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100 \begin{funcdesc}{handle_image}{source\, alt\optional{\, ismap\optional{\, align\optional{\, width\optional{\, height}}}}}
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101 This method is called to handle images. The default implementation
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102 simply passes the \code{alt} value to the \code{handle_data()}
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103 method.
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104 \end{funcdesc}
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105
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106 \begin{funcdesc}{save_bgn}{}
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107 Begins saving character data in a buffer instead of sending it to the
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108 formatter object. Retrieve the stored data via \code{save_end()}
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109 Use of the \code{save_bgn()} / \code{save_end()} pair may not be
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110 nested.
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111 \end{funcdesc}
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112
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113 \begin{funcdesc}{save_end}{}
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114 Ends buffering character data and returns all data saved since the
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115 preceeding call to \code{save_bgn()}. If \code{nofill} flag is false,
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116 whitespace is collapsed to single spaces. A call to this method
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117 without a preceeding call to \code{save_bgn()} will raise a
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118 \code{TypeError} exception.
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cdd3a721b40e a few typographical changes (e.g. -- => ---) and lots of new stuff in the WWW chapter
Guido van Rossum <guido@python.org>
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119 \end{funcdesc}