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| 54 | |
| 55 | <H1><A NAME="SECTION0015200000000000000000"> |
| 56 | 13.2 <tt class="module">sgmllib</tt> -- |
| 57 | Simple SGML parser</A> |
| 58 | </H1> |
| 59 | |
| 60 | <P> |
| 61 | <A NAME="module-sgmllib"></A> |
| 62 | |
| 63 | <P> |
| 64 | <a id='l2h-4280' xml:id='l2h-4280'></a> |
| 65 | |
| 66 | <P> |
| 67 | This module defines a class <tt class="class">SGMLParser</tt> which serves as the |
| 68 | basis for parsing text files formatted in SGML (Standard Generalized |
| 69 | Mark-up Language). In fact, it does not provide a full SGML parser |
| 70 | -- it only parses SGML insofar as it is used by HTML, and the module |
| 71 | only exists as a base for the <tt class="module"><a href="module-htmllib.html">htmllib</a></tt> module. Another |
| 72 | HTML parser which supports XHTML and offers a somewhat different |
| 73 | interface is available in the <tt class="module"><a href="module-HTMLParser.html">HTMLParser</a></tt> module. |
| 74 | |
| 75 | <P> |
| 76 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 77 | <td><nobr><b><span class="typelabel">class</span> <tt id='l2h-4260' xml:id='l2h-4260' class="class">SGMLParser</tt></b>(</nobr></td> |
| 78 | <td><var></var>)</td></tr></table></dt> |
| 79 | <dd> |
| 80 | The <tt class="class">SGMLParser</tt> class is instantiated without arguments. |
| 81 | The parser is hardcoded to recognize the following |
| 82 | constructs: |
| 83 | |
| 84 | <P> |
| 85 | |
| 86 | <UL> |
| 87 | <LI>Opening and closing tags of the form |
| 88 | "<tt class="samp"><<var>tag</var> <var>attr</var>="<var>value</var>" ...></tt>" and |
| 89 | "<tt class="samp"></<var>tag</var>></tt>", respectively. |
| 90 | |
| 91 | <P> |
| 92 | </LI> |
| 93 | <LI>Numeric character references of the form "<tt class="samp">&#<var>name</var>;</tt>". |
| 94 | |
| 95 | <P> |
| 96 | </LI> |
| 97 | <LI>Entity references of the form "<tt class="samp">&<var>name</var>;</tt>". |
| 98 | |
| 99 | <P> |
| 100 | </LI> |
| 101 | <LI>SGML comments of the form "<tt class="samp"><!--<var>text</var>--></tt>". Note that |
| 102 | spaces, tabs, and newlines are allowed between the trailing |
| 103 | "<tt class="samp">></tt>" and the immediately preceding "<tt class="samp">--</tt>". |
| 104 | |
| 105 | <P> |
| 106 | </LI> |
| 107 | </UL> |
| 108 | </dl> |
| 109 | |
| 110 | <P> |
| 111 | A single exception is defined as well: |
| 112 | |
| 113 | <P> |
| 114 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4261' xml:id='l2h-4261' class="exception">SGMLParseError</tt></b></dt> |
| 115 | <dd> |
| 116 | Exception raised by the <tt class="class">SGMLParser</tt> class when it encounters an |
| 117 | error while parsing. |
| 118 | |
| 119 | <span class="versionnote">New in version 2.1.</span> |
| 120 | |
| 121 | </dd></dl> |
| 122 | |
| 123 | <P> |
| 124 | <tt class="class">SGMLParser</tt> instances have the following methods: |
| 125 | |
| 126 | <P> |
| 127 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 128 | <td><nobr><b><tt id='l2h-4262' xml:id='l2h-4262' class="method">reset</tt></b>(</nobr></td> |
| 129 | <td><var></var>)</td></tr></table></dt> |
| 130 | <dd> |
| 131 | Reset the instance. Loses all unprocessed data. This is called |
| 132 | implicitly at instantiation time. |
| 133 | </dl> |
| 134 | |
| 135 | <P> |
| 136 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 137 | <td><nobr><b><tt id='l2h-4263' xml:id='l2h-4263' class="method">setnomoretags</tt></b>(</nobr></td> |
| 138 | <td><var></var>)</td></tr></table></dt> |
| 139 | <dd> |
| 140 | Stop processing tags. Treat all following input as literal input |
| 141 | (CDATA). (This is only provided so the HTML tag |
| 142 | <code><PLAINTEXT></code> can be implemented.) |
| 143 | </dl> |
| 144 | |
| 145 | <P> |
| 146 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 147 | <td><nobr><b><tt id='l2h-4264' xml:id='l2h-4264' class="method">setliteral</tt></b>(</nobr></td> |
| 148 | <td><var></var>)</td></tr></table></dt> |
| 149 | <dd> |
| 150 | Enter literal mode (CDATA mode). |
| 151 | </dl> |
| 152 | |
| 153 | <P> |
| 154 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 155 | <td><nobr><b><tt id='l2h-4265' xml:id='l2h-4265' class="method">feed</tt></b>(</nobr></td> |
| 156 | <td><var>data</var>)</td></tr></table></dt> |
| 157 | <dd> |
| 158 | Feed some text to the parser. It is processed insofar as it consists |
| 159 | of complete elements; incomplete data is buffered until more data is |
| 160 | fed or <tt class="method">close()</tt> is called. |
| 161 | </dl> |
| 162 | |
| 163 | <P> |
| 164 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 165 | <td><nobr><b><tt id='l2h-4266' xml:id='l2h-4266' class="method">close</tt></b>(</nobr></td> |
| 166 | <td><var></var>)</td></tr></table></dt> |
| 167 | <dd> |
| 168 | Force processing of all buffered data as if it were followed by an |
| 169 | end-of-file mark. This method may be redefined by a derived class to |
| 170 | define additional processing at the end of the input, but the |
| 171 | redefined version should always call <tt class="method">close()</tt>. |
| 172 | </dl> |
| 173 | |
| 174 | <P> |
| 175 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 176 | <td><nobr><b><tt id='l2h-4267' xml:id='l2h-4267' class="method">get_starttag_text</tt></b>(</nobr></td> |
| 177 | <td><var></var>)</td></tr></table></dt> |
| 178 | <dd> |
| 179 | Return the text of the most recently opened start tag. This should |
| 180 | not normally be needed for structured processing, but may be useful in |
| 181 | dealing with HTML ``as deployed'' or for re-generating input with |
| 182 | minimal changes (whitespace between attributes can be preserved, |
| 183 | etc.). |
| 184 | </dl> |
| 185 | |
| 186 | <P> |
| 187 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 188 | <td><nobr><b><tt id='l2h-4268' xml:id='l2h-4268' class="method">handle_starttag</tt></b>(</nobr></td> |
| 189 | <td><var>tag, method, attributes</var>)</td></tr></table></dt> |
| 190 | <dd> |
| 191 | This method is called to handle start tags for which either a |
| 192 | <tt class="method">start_<var>tag</var>()</tt> or <tt class="method">do_<var>tag</var>()</tt> method has been |
| 193 | defined. The <var>tag</var> argument is the name of the tag converted to |
| 194 | lower case, and the <var>method</var> argument is the bound method which |
| 195 | should be used to support semantic interpretation of the start tag. |
| 196 | The <var>attributes</var> argument is a list of <code>(<var>name</var>, |
| 197 | <var>value</var>)</code> pairs containing the attributes found inside the tag's |
| 198 | <code><></code> brackets. The <var>name</var> has been translated to lower case |
| 199 | and double quotes and backslashes in the <var>value</var> have been interpreted. |
| 200 | For instance, for the tag <code><A HREF="http://www.cwi.nl/"></code>, this |
| 201 | method would be called as "<tt class="samp">unknown_starttag('a', [('href', |
| 202 | 'http://www.cwi.nl/')])</tt>". The base implementation simply calls |
| 203 | <var>method</var> with <var>attributes</var> as the only argument. |
| 204 | </dl> |
| 205 | |
| 206 | <P> |
| 207 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 208 | <td><nobr><b><tt id='l2h-4269' xml:id='l2h-4269' class="method">handle_endtag</tt></b>(</nobr></td> |
| 209 | <td><var>tag, method</var>)</td></tr></table></dt> |
| 210 | <dd> |
| 211 | This method is called to handle endtags for which an |
| 212 | <tt class="method">end_<var>tag</var>()</tt> method has been defined. The |
| 213 | <var>tag</var> argument is the name of the tag converted to lower case, and |
| 214 | the <var>method</var> argument is the bound method which should be used to |
| 215 | support semantic interpretation of the end tag. If no |
| 216 | <tt class="method">end_<var>tag</var>()</tt> method is defined for the closing element, |
| 217 | this handler is not called. The base implementation simply calls |
| 218 | <var>method</var>. |
| 219 | </dl> |
| 220 | |
| 221 | <P> |
| 222 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 223 | <td><nobr><b><tt id='l2h-4270' xml:id='l2h-4270' class="method">handle_data</tt></b>(</nobr></td> |
| 224 | <td><var>data</var>)</td></tr></table></dt> |
| 225 | <dd> |
| 226 | This method is called to process arbitrary data. It is intended to be |
| 227 | overridden by a derived class; the base class implementation does |
| 228 | nothing. |
| 229 | </dl> |
| 230 | |
| 231 | <P> |
| 232 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 233 | <td><nobr><b><tt id='l2h-4271' xml:id='l2h-4271' class="method">handle_charref</tt></b>(</nobr></td> |
| 234 | <td><var>ref</var>)</td></tr></table></dt> |
| 235 | <dd> |
| 236 | This method is called to process a character reference of the form |
| 237 | "<tt class="samp">&#<var>ref</var>;</tt>". In the base implementation, <var>ref</var> must |
| 238 | be a decimal number in the |
| 239 | range 0-255. It translates the character to ASCII and calls the |
| 240 | method <tt class="method">handle_data()</tt> with the character as argument. If |
| 241 | <var>ref</var> is invalid or out of range, the method |
| 242 | <code>unknown_charref(<var>ref</var>)</code> is called to handle the error. A |
| 243 | subclass must override this method to provide support for named |
| 244 | character entities. |
| 245 | </dl> |
| 246 | |
| 247 | <P> |
| 248 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 249 | <td><nobr><b><tt id='l2h-4272' xml:id='l2h-4272' class="method">handle_entityref</tt></b>(</nobr></td> |
| 250 | <td><var>ref</var>)</td></tr></table></dt> |
| 251 | <dd> |
| 252 | This method is called to process a general entity reference of the |
| 253 | form "<tt class="samp">&<var>ref</var>;</tt>" where <var>ref</var> is an general entity |
| 254 | reference. It looks for <var>ref</var> in the instance (or class) |
| 255 | variable <tt class="member">entitydefs</tt> which should be a mapping from entity |
| 256 | names to corresponding translations. If a translation is found, it |
| 257 | calls the method <tt class="method">handle_data()</tt> with the translation; |
| 258 | otherwise, it calls the method <code>unknown_entityref(<var>ref</var>)</code>. |
| 259 | The default <tt class="member">entitydefs</tt> defines translations for |
| 260 | <code>&amp;</code>, <code>&apos</code>, <code>&gt;</code>, <code>&lt;</code>, and |
| 261 | <code>&quot;</code>. |
| 262 | </dl> |
| 263 | |
| 264 | <P> |
| 265 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 266 | <td><nobr><b><tt id='l2h-4273' xml:id='l2h-4273' class="method">handle_comment</tt></b>(</nobr></td> |
| 267 | <td><var>comment</var>)</td></tr></table></dt> |
| 268 | <dd> |
| 269 | This method is called when a comment is encountered. The |
| 270 | <var>comment</var> argument is a string containing the text between the |
| 271 | "<tt class="samp"><!--</tt>" and "<tt class="samp">--></tt>" delimiters, but not the delimiters |
| 272 | themselves. For example, the comment "<tt class="samp"><!--text--></tt>" will |
| 273 | cause this method to be called with the argument <code>'text'</code>. The |
| 274 | default method does nothing. |
| 275 | </dl> |
| 276 | |
| 277 | <P> |
| 278 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 279 | <td><nobr><b><tt id='l2h-4274' xml:id='l2h-4274' class="method">handle_decl</tt></b>(</nobr></td> |
| 280 | <td><var>data</var>)</td></tr></table></dt> |
| 281 | <dd> |
| 282 | Method called when an SGML declaration is read by the parser. In |
| 283 | practice, the <code>DOCTYPE</code> declaration is the only thing observed in |
| 284 | HTML, but the parser does not discriminate among different (or broken) |
| 285 | declarations. Internal subsets in a <code>DOCTYPE</code> declaration are |
| 286 | not supported. The <var>data</var> parameter will be the entire contents |
| 287 | of the declaration inside the <code><!</code>...<code>></code> markup. The |
| 288 | default implementation does nothing. |
| 289 | </dl> |
| 290 | |
| 291 | <P> |
| 292 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 293 | <td><nobr><b><tt id='l2h-4275' xml:id='l2h-4275' class="method">report_unbalanced</tt></b>(</nobr></td> |
| 294 | <td><var>tag</var>)</td></tr></table></dt> |
| 295 | <dd> |
| 296 | This method is called when an end tag is found which does not |
| 297 | correspond to any open element. |
| 298 | </dl> |
| 299 | |
| 300 | <P> |
| 301 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 302 | <td><nobr><b><tt id='l2h-4276' xml:id='l2h-4276' class="method">unknown_starttag</tt></b>(</nobr></td> |
| 303 | <td><var>tag, attributes</var>)</td></tr></table></dt> |
| 304 | <dd> |
| 305 | This method is called to process an unknown start tag. It is intended |
| 306 | to be overridden by a derived class; the base class implementation |
| 307 | does nothing. |
| 308 | </dl> |
| 309 | |
| 310 | <P> |
| 311 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 312 | <td><nobr><b><tt id='l2h-4277' xml:id='l2h-4277' class="method">unknown_endtag</tt></b>(</nobr></td> |
| 313 | <td><var>tag</var>)</td></tr></table></dt> |
| 314 | <dd> |
| 315 | This method is called to process an unknown end tag. It is intended |
| 316 | to be overridden by a derived class; the base class implementation |
| 317 | does nothing. |
| 318 | </dl> |
| 319 | |
| 320 | <P> |
| 321 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 322 | <td><nobr><b><tt id='l2h-4278' xml:id='l2h-4278' class="method">unknown_charref</tt></b>(</nobr></td> |
| 323 | <td><var>ref</var>)</td></tr></table></dt> |
| 324 | <dd> |
| 325 | This method is called to process unresolvable numeric character |
| 326 | references. Refer to <tt class="method">handle_charref()</tt> to determine what is |
| 327 | handled by default. It is intended to be overridden by a derived |
| 328 | class; the base class implementation does nothing. |
| 329 | </dl> |
| 330 | |
| 331 | <P> |
| 332 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 333 | <td><nobr><b><tt id='l2h-4279' xml:id='l2h-4279' class="method">unknown_entityref</tt></b>(</nobr></td> |
| 334 | <td><var>ref</var>)</td></tr></table></dt> |
| 335 | <dd> |
| 336 | This method is called to process an unknown entity reference. It is |
| 337 | intended to be overridden by a derived class; the base class |
| 338 | implementation does nothing. |
| 339 | </dl> |
| 340 | |
| 341 | <P> |
| 342 | Apart from overriding or extending the methods listed above, derived |
| 343 | classes may also define methods of the following form to define |
| 344 | processing of specific tags. Tag names in the input stream are case |
| 345 | independent; the <var>tag</var> occurring in method names must be in lower |
| 346 | case: |
| 347 | |
| 348 | <P> |
| 349 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 350 | <td><nobr><b>start_<var>tag</var></b>(</nobr></td> |
| 351 | <td><var>attributes</var>)</td></tr></table></dt> |
| 352 | <dd> |
| 353 | This method is called to process an opening tag <var>tag</var>. It has |
| 354 | preference over <tt class="method">do_<var>tag</var>()</tt>. The |
| 355 | <var>attributes</var> argument has the same meaning as described for |
| 356 | <tt class="method">handle_starttag()</tt> above. |
| 357 | </dl> |
| 358 | |
| 359 | <P> |
| 360 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 361 | <td><nobr><b>do_<var>tag</var></b>(</nobr></td> |
| 362 | <td><var>attributes</var>)</td></tr></table></dt> |
| 363 | <dd> |
| 364 | This method is called to process an opening tag <var>tag</var> that does |
| 365 | not come with a matching closing tag. The <var>attributes</var> argument |
| 366 | has the same meaning as described for <tt class="method">handle_starttag()</tt> above. |
| 367 | </dl> |
| 368 | |
| 369 | <P> |
| 370 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 371 | <td><nobr><b>end_<var>tag</var></b>(</nobr></td> |
| 372 | <td><var></var>)</td></tr></table></dt> |
| 373 | <dd> |
| 374 | This method is called to process a closing tag <var>tag</var>. |
| 375 | </dl> |
| 376 | |
| 377 | <P> |
| 378 | Note that the parser maintains a stack of open elements for which no |
| 379 | end tag has been found yet. Only tags processed by |
| 380 | <tt class="method">start_<var>tag</var>()</tt> are pushed on this stack. Definition of an |
| 381 | <tt class="method">end_<var>tag</var>()</tt> method is optional for these tags. For tags |
| 382 | processed by <tt class="method">do_<var>tag</var>()</tt> or by <tt class="method">unknown_tag()</tt>, no |
| 383 | <tt class="method">end_<var>tag</var>()</tt> method must be defined; if defined, it will |
| 384 | not be used. If both <tt class="method">start_<var>tag</var>()</tt> and |
| 385 | <tt class="method">do_<var>tag</var>()</tt> methods exist for a tag, the |
| 386 | <tt class="method">start_<var>tag</var>()</tt> method takes precedence. |
| 387 | |
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| 411 | </tr></table> |
| 412 | <div class='online-navigation'> |
| 413 | <b class="navlabel">Previous:</b> |
| 414 | <a class="sectref" rel="prev" href="htmlparser-example.html">13.1.1 Example HTML Parser</A> |
| 415 | <b class="navlabel">Up:</b> |
| 416 | <a class="sectref" rel="parent" href="markup.html">13. Structured Markup Processing</A> |
| 417 | <b class="navlabel">Next:</b> |
| 418 | <a class="sectref" rel="next" href="module-htmllib.html">13.3 htmllib </A> |
| 419 | </div> |
| 420 | </div> |
| 421 | <hr /> |
| 422 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> |
| 423 | </DIV> |
| 424 | <!--End of Navigation Panel--> |
| 425 | <ADDRESS> |
| 426 | See <i><a href="about.html">About this document...</a></i> for information on suggesting changes. |
| 427 | </ADDRESS> |
| 428 | </BODY> |
| 429 | </HTML> |