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<a name="130" href="#130">130</a> +<span class="string">"|(//S{1,"</span>+MAX_ATTR_VAL_LENGTH+<span class="string">"}))"</span>; <em class="comment">// 15</em><a name="131" href="#131">131</a> <em class="comment">// groups:</em><a name="132" href="#132">132</a> <em class="comment">// 1: attribute name</em><a name="133" href="#133">133</a> <em class="comment">// 2: HREF - single URI relative to doc base, or occasionally javascript:</em><a name="134" href="#134">134</a> <em class="comment">// 3: ACTION - single URI relative to doc base, or occasionally javascript:</em><a name="135" href="#135">135</a> <em class="comment">// 4: ON[WHATEVER] - script handler</em><a name="136" href="#136">136</a> <em class="comment">// 5: SRC,LOWSRC,BACKGROUND,CITE,LONGDESC,USEMAP,PROFILE, or DATASRC</em><a name="137" href="#137">137</a> <em class="comment">// single URI relative to doc base</em><a name="138" href="#138">138</a> <em class="comment">// 6: CODEBASE - a single URI relative to doc base, affecting other</em><a name="139" href="#139">139</a> <em class="comment">// attributes</em><a name="140" href="#140">140</a> <em class="comment">// 7: CLASSID, DATA - a single URI relative to CODEBASE (if supplied)</em><a name="141" href="#141">141</a> <em class="comment">// 8: ARCHIVE - one or more space-delimited URIs relative to CODEBASE</em><a name="142" href="#142">142</a> <em class="comment">// (if supplied)</em><a name="143" href="#143">143</a> <em class="comment">// 9: CODE - a single URI relative to the CODEBASE (is specified).</em><a name="144" href="#144">144</a> <em class="comment">// 10: VALUE - often includes a uri path on forms</em><a name="145" href="#145">145</a> <em class="comment">// 11: STYLE - inline attribute style info</em><a name="146" href="#146">146</a> <em class="comment">// 12: any other attribute</em><a name="147" href="#147">147</a> <em class="comment">// 13: double-quote delimited attr value</em><a name="148" href="#148">148</a> <em class="comment">// 14: single-quote delimited attr value</em><a name="149" href="#149">149</a> <em class="comment">// 15: space-delimited attr value</em><a name="150" href="#150">150</a> <a name="151" href="#151">151</a> <a name="152" href="#152">152</a> <em class="comment">// much like the javascript likely-URI extractor, but</em><a name="153" href="#153">153</a> <em class="comment">// without requiring quotes -- this can indicate whether</em><a name="154" href="#154">154</a> <em class="comment">// an HTML tag attribute that isn't definitionally a</em><a name="155" href="#155">155</a> <em class="comment">// URI might be one anyway, as in form-tag VALUE attributes</em><a name="156" href="#156">156</a> <strong>static</strong> <strong>final</strong> String LIKELY_URI_PATH =<a name="157" href="#157">157</a> <span class="string">"(//.{0,2}[^//.//n//r//s\"']*(//.[^//.//n//r//s\"']+)+)"</span>;<a name="158" href="#158">158</a> <strong>static</strong> <strong>final</strong> String WHITESPACE = <span class="string">"//s"</span>;<a name="159" href="#159">159</a> <strong>static</strong> <strong>final</strong> String CLASSEXT =<span class="string">".class"</span>;<a name="160" href="#160">160</a> <strong>static</strong> <strong>final</strong> String APPLET = <span class="string">"applet"</span>;<a name="161" href="#161">161</a> <strong>static</strong> <strong>final</strong> String BASE = <span class="string">"base"</span>;<a name="162" href="#162">162</a> <strong>static</strong> <strong>final</strong> String LINK = <span class="string">"link"</span>;<a name="163" href="#163">163</a> <strong>static</strong> <strong>final</strong> String FRAME = <span class="string">"frame"</span>;<a name="164" href="#164">164</a> <strong>static</strong> <strong>final</strong> String IFRAME = <span class="string">"iframe"</span>;<a name="165" href="#165">165</a> <a name="166" href="#166">166</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String ATTR_TREAT_FRAMES_AS_EMBED_LINKS =<a name="167" href="#167">167</a> <span class="string">"treat-frames-as-embed-links"</span>;<a name="168" href="#168">168</a> <a name="169" href="#169">169</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String ATTR_IGNORE_FORM_ACTION_URLS =<a name="170" href="#170">170</a> <span class="string">"ignore-form-action-urls"</span>;<a name="171" href="#171">171</a> <a name="172" href="#172">172</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String ATTR_OVERLY_EAGER_LINK_DETECTION =<a name="173" href="#173">173</a> <span class="string">"overly-eager-link-detection"</span>;<a name="174" href="#174">174</a> <a name="175" href="#175">175</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String ATTR_IGNORE_UNEXPECTED_HTML = <a name="176" href="#176">176</a> <span class="string">"ignore-unexpected-html"</span>;<a name="177" href="#177">177</a> <a name="178" href="#178">178</a> <a name="179" href="#179">179</a> <strong>protected</strong> <strong>long</strong> numberOfCURIsHandled = 0;<a name="180" href="#180">180</a> <strong>protected</strong> <strong>long</strong> numberOfLinksExtracted = 0;<a name="181" href="#181">181</a> <a name="182" href="#182">182</a> <strong>public</strong> <a href="../../../../org/archive/crawler/extractor/ExtractorHTML.html">ExtractorHTML</a>(String name) {<a name="183" href="#183">183</a> <strong>this</strong>(name, <span class="string">"HTML extractor. Extracts links from HTML documents"</span>);<a name="184" href="#184">184</a> }<a name="185" href="#185">185</a> <a name="186" href="#186">186</a> <strong>public</strong> <a href="../../../../org/archive/crawler/extractor/ExtractorHTML.html">ExtractorHTML</a>(String name, String description) {<a name="187" href="#187">187</a> <strong>super</strong>(name, description);<a name="188" href="#188">188</a> <a href="../../../../org/archive/crawler/settings/Type.html">Type</a> t = addElementToDefinition(<a name="189" href="#189">189</a> <strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_TREAT_FRAMES_AS_EMBED_LINKS,<a name="190" href="#190">190</a> <span class="string">"If enabled, FRAME/IFRAME SRC-links are treated as embedded "</span> +<a name="191" href="#191">191</a> <span class="string">"resources (IMG etc.), otherwise they are treated as "</span> +<a name="192" href="#192">192</a> <span class="string">"navigational links"</span>, Boolean.TRUE));<a name="193" href="#193">193</a> t.setExpertSetting(<strong>true</strong>);<a name="194" href="#194">194</a> t = addElementToDefinition(<a name="195" href="#195">195</a> <strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_IGNORE_FORM_ACTION_URLS,<a name="196" href="#196">196</a> <span class="string">"If enabled, links appearing as the ACTION attribute in "</span> +<a name="197" href="#197">197</a> <span class="string">"HTML FORMs are not extracted."</span>, Boolean.FALSE));<a name="198" href="#198">198</a> t.setExpertSetting(<strong>true</strong>);<a name="199" href="#199">199</a> t = addElementToDefinition(<a name="200" href="#200">200</a> <strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_OVERLY_EAGER_LINK_DETECTION,<a name="201" href="#201">201</a> <span class="string">"If disabled (default is enabled), possible links will not be "</span>+<a name="202" href="#202">202</a> <span class="string">"queued if they are placed in (somewhat) unlikely places "</span> + <a name="203" href="#203">203</a> <span class="string">"(Currently, just ignores URLs in HTML value attributes)."</span>,<a name="204" href="#204">204</a> Boolean.TRUE));<a name="205" href="#205">205</a> t.setExpertSetting(<strong>true</strong>);<a name="206" href="#206">206</a> t = addElementToDefinition(<a name="207" href="#207">207</a> <strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_IGNORE_UNEXPECTED_HTML,<a name="208" href="#208">208</a> <span class="string">"If enabled, html that is detected in unusual or unexpected "</span> +<a name="209" href="#209">209</a> <span class="string">"places is not considerd for processing."</span>, Boolean.TRUE));<a name="210" href="#210">210</a> t.setExpertSetting(<strong>true</strong>);<a name="211" href="#211">211</a> }<a name="212" href="#212">212</a> <a name="213" href="#213">213</a> <strong>protected</strong> <strong>void</strong> processGeneralTag(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi, CharSequence element,<a name="214" href="#214">214</a> CharSequence cs) {<a name="215" href="#215">215</a> <a name="216" href="#216">216</a> Matcher attr = TextUtils.getMatcher(EACH_ATTRIBUTE_EXTRACTOR, cs);<a name="217" href="#217">217</a> <a name="218" href="#218">218</a> <em class="comment">// Just in case it's an OBJECT or APPLET tag</em><a name="219" href="#219">219</a> String codebase = <strong>null</strong>;<a name="220" href="#220">220</a> ArrayList resources = <strong>null</strong>;<a name="221" href="#221">221</a> <a name="222" href="#222">222</a> <strong>final</strong> <strong>boolean</strong> framesAsEmbeds = ((Boolean)getUncheckedAttribute(curi,<a name="223" href="#223">223</a> ATTR_TREAT_FRAMES_AS_EMBED_LINKS)).booleanValue();<a name="224" href="#224">224</a> <a name="225" href="#225">225</a> <strong>final</strong> <strong>boolean</strong> ignoreFormActions = ((Boolean)getUncheckedAttribute(curi,<a name="226" href="#226">226</a> ATTR_IGNORE_FORM_ACTION_URLS)).booleanValue();<a name="227" href="#227">227</a> <a name="228" href="#228">228</a> <strong>final</strong> <strong>boolean</strong> overlyEagerLinkDetection = ((Boolean)getUncheckedAttribute<a name="229" href="#229">229</a> (curi, ATTR_OVERLY_EAGER_LINK_DETECTION)).booleanValue();<a name="230" href="#230">230</a> <a name="231" href="#231">231</a> <strong>final</strong> String elementStr = element.toString();<a name="232" href="#232">232</a> <a name="233" href="#233">233</a> <strong>while</strong> (attr.find()) {<a name="234" href="#234">234</a> <strong>int</strong> valueGroup =<a name="235" href="#235">235</a> (attr.start(13) > -1) ? 13 : (attr.start(14) > -1) ? 14 : 15;<a name="236" href="#236">236</a> <strong>int</strong> start = attr.start(valueGroup);<a name="237" href="#237">237</a> <strong>int</strong> end = attr.end(valueGroup);<a name="238" href="#238">238</a> assert start >= 0: <span class="string">"Start is: "</span> + start + <span class="string">", "</span> + curi;<a name="239" href="#239">239</a> assert end >= 0: <span class="string">"End is :"</span> + end + <span class="string">", "</span> + curi;<a name="240" href="#240">240</a> CharSequence value = cs.subSequence(start, end);<a name="241" href="#241">241</a> value = TextUtils.unescapeHtml(value);<a name="242" href="#242">242</a> <strong>if</strong> (attr.start(2) > -1) {<a name="243" href="#243">243</a> <em class="comment">// HREF</em><a name="244" href="#244">244</a> CharSequence context =<a name="245" href="#245">245</a> Link.elementContext(element, attr.group(2));<a name="246" href="#246">246</a> <strong>if</strong>(elementStr.equalsIgnoreCase(LINK)) {<a name="247" href="#247">247</a> <em class="comment">// <LINK> elements treated as embeds (css, ico, etc)</em><a name="248" href="#248">248</a> processEmbed(curi, value, context);<a name="249" href="#249">249</a> } <strong>else</strong> {<a name="250" href="#250">250</a> <em class="comment">// other HREFs treated as links</em><a name="251" href="#251">251</a> processLink(curi, value, context);<a name="252" href="#252">252</a> }<a name="253" href="#253">253</a> <strong>if</strong> (elementStr.equalsIgnoreCase(BASE)) {<a name="254" href="#254">254</a> <strong>try</strong> {<a name="255" href="#255">255</a> curi.setBaseURI(value.toString());<a name="256" href="#256">256</a> } <strong>catch</strong> (URIException e) {<a name="257" href="#257">257</a> <strong>if</strong> (getController() != <strong>null</strong>) {<a name="258" href="#258">258</a> <em class="comment">// Controller can be null: e.g. when running</em><a name="259" href="#259">259</a> <em class="comment">// ExtractorTool.</em><a name="260" href="#260">260</a> getController().logUriError(e, curi.getUURI(),<a name="261" href="#261">261</a> value.toString());<a name="262" href="#262">262</a> } <strong>else</strong> {<a name="263" href="#263">263</a> logger.info(<span class="string">"Failed set base uri: "</span> +<a name="264" href="#264">264</a> curi + <span class="string">", "</span> + value.toString() + <span class="string">": "</span> +<a name="265" href="#265">265</a> e.getMessage());<a name="266" href="#266">266</a> }<a name="267" href="#267">267</a> }⌨️ 快捷键说明
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