Make io.Driver expose public dontSwallowBom()

This change makes nu.validator.htmlparser.io.Driver instances have a
dontSwallowBom() method exposed.

Otherwise, without this change, it’s not possible for users of io.Driver
to preserve the BOM in input.

Author: sideshowbarker

src/nu/validator/htmlparser/io/Driver.java

@@ -59,7 +59,7 @@ public class Driver implements EncodingDeclarationHandler {
      */
     private RewindableInputStream rewindableInputStream;
 
-    private boolean swallowBom;
+    private boolean swallowBom = true;
 
     private Encoding characterEncoding;
 
@@ -196,7 +196,6 @@ public void tokenize(InputSource is, int bufferSize)
         }
         tokenizer.start();
         confidence = Confidence.TENTATIVE;
-        swallowBom = true;
         rewindableInputStream = null;
         tokenizer.initLocation(is.getPublicId(), is.getSystemId());
         this.reader = is.getCharacterStream();
@@ -284,7 +283,7 @@ public void tokenize(InputSource is, int bufferSize)
         }
     }
 
-    void dontSwallowBom() {
+    public void dontSwallowBom() {
         swallowBom = false;
     }