Add HTML processing instruction tokenizer states

src/nu/validator/htmlparser/common/TokenHandler.java

@@ -119,6 +119,22 @@ public void startTag(ElementName eltName, HtmlAttributes attributes,
      */
     public void comment(@NoLength char[] buf, int start, int length) throws SAXException;
 
+    /**
+     * Receive a processing instruction token.
+     * 
+     * @param target
+     *            the target of the processing instruction
+     * @param buf
+     *            a buffer holding the data
+     * @param start the offset into the buffer
+     * @param length
+     *            the number of code units to read
+     * @throws SAXException
+     *             if something went wrong
+     */
+    public void processingInstruction(String target, @NoLength char[] buf,
+            int start, int length) throws SAXException;
+
     /**
      * Receive character tokens. This method has the same semantics as the SAX
      * method of the same name.

src/nu/validator/htmlparser/dom/DOMTreeBuilder.java

@@ -149,6 +149,36 @@ protected DOMTreeBuilder(DOMImplementation implementation) {
         }
     }
 
+    /**
+     * 
+     * @see nu.validator.htmlparser.impl.CoalescingTreeBuilder#appendProcessingInstruction(java.lang.Object,
+     *      java.lang.String, java.lang.String)
+     */
+    @Override protected void appendProcessingInstruction(Element parent,
+            String target, String data) throws SAXException {
+        try {
+            parent.appendChild(
+                    document.createProcessingInstruction(target, data));
+        } catch (DOMException e) {
+            fatal(e);
+        }
+    }
+
+    /**
+     * 
+     * @see nu.validator.htmlparser.impl.CoalescingTreeBuilder#appendProcessingInstructionToDocument(java.lang.String,
+     *      java.lang.String)
+     */
+    @Override protected void appendProcessingInstructionToDocument(
+            String target, String data) throws SAXException {
+        try {
+            document.appendChild(
+                    document.createProcessingInstruction(target, data));
+        } catch (DOMException e) {
+            fatal(e);
+        }
+    }
+
     /**
      * 
      * @see nu.validator.htmlparser.impl.TreeBuilder#createElement(String, String, nu.validator.htmlparser.impl.HtmlAttributes, Object)

src/nu/validator/htmlparser/impl/CoalescingTreeBuilder.java

@@ -71,6 +71,32 @@ protected final void accumulateCharacters(@NoLength char[] buf, int start,
 
     protected abstract void appendCommentToDocument(String comment) throws SAXException;
 
+    /**
+     * @see nu.validator.htmlparser.impl.TreeBuilder#appendProcessingInstruction(java.lang.Object, java.lang.String, char[], int, int)
+     */
+    @Override final protected void appendProcessingInstruction(T parent,
+            String target, char[] buf, int start, int length)
+            throws SAXException {
+        appendProcessingInstruction(parent, target,
+                new String(buf, start, length));
+    }
+
+    protected abstract void appendProcessingInstruction(T parent,
+            String target, String data) throws SAXException;
+
+    /**
+     * @see nu.validator.htmlparser.impl.TreeBuilder#appendProcessingInstructionToDocument(java.lang.String, char[], int, int)
+     */
+    @Override protected final void appendProcessingInstructionToDocument(
+            String target, char[] buf, int start, int length)
+            throws SAXException {
+        appendProcessingInstructionToDocument(target,
+                new String(buf, start, length));
+    }
+
+    protected abstract void appendProcessingInstructionToDocument(
+            String target, String data) throws SAXException;
+
     /**
      * @see nu.validator.htmlparser.impl.TreeBuilder#insertFosterParentedCharacters(char[], int, int, java.lang.Object, java.lang.Object)
      */

src/nu/validator/htmlparser/impl/ErrorReportingTokenizer.java

@@ -492,6 +492,25 @@ private boolean isAstralPrivateUse(int c) {
         err("Saw \u201C<?\u201D. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)");
     }
 
+    @Override protected void errEofInProcessingInstruction() throws SAXException {
+        err("End of file inside processing instruction.");
+    }
+
+    @Override protected void errInvalidFirstCharacterOfProcessingInstructionTarget()
+            throws SAXException {
+        err("Invalid first character of processing instruction target. Treating the processing instruction as a comment.");
+    }
+
+    @Override protected void errInvalidProcessingInstructionTarget()
+            throws SAXException {
+        err("Invalid character in processing instruction target. Treating the processing instruction as a comment.");
+    }
+
+    @Override protected void errDisallowedProcessingInstructionTarget()
+            throws SAXException {
+        err("Processing instruction targets \u201Cxml\u201D and \u201Cxml-stylesheet\u201D are not allowed. Treating the processing instruction as a comment.");
+    }
+
     @Override protected void errUnescapedAmpersandInterpretedAsCharacterReference()
             throws SAXException {
         if (errorHandler == null) {