Custom Injector to display URL address along with link text.

When viewing potentially hostile html, it may be helpful to see what
a given link was pointing to.  This new injector takes the href
attribute and adds the text after the link, and deletes the href
attribute.

Other forms of display could easily be contrived, but this seems to be
a good basic way to present the information.

Signed-off-by: David Morton <mortonda@dgrmm.net>
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>

tests/HTMLPurifier/Injector/DisplayLinkURITest.php

@@ -0,0 +1,32 @@
+<?php
+
+class HTMLPurifier_Injector_DisplayLinkURITest extends HTMLPurifier_InjectorHarness
+{
+    
+    function setup() {
+        parent::setup();
+        $this->config->set('AutoFormat', 'DisplayLinkURI', true);
+    }
+    
+    function testBasicLink() {
+        $this->assertResult(
+            '<a href="http://malware.example.com">Don\'t go here!</a>',
+            '<a>Don\'t go here!</a> (http://malware.example.com)'
+        );
+    }
+    
+    function testEmptyLink() {
+        $this->assertResult(
+            '<a>Don\'t go here!</a>',
+            '<a>Don\'t go here!</a>'
+        );
+    }
+    function testEmptyText() {
+        $this->assertResult(
+            '<a href="http://malware.example.com"></a>',
+            '<a></a> (http://malware.example.com)'
+        );
+    }
+    
+}
+?>