LUCENE-5191: Fix Unicode corrumption in HTML escaping of Standard Highlighter and Fast Vector Highlighter.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1518839 13f79535-47bb-0310-9956-ffa450edef68

lucene/CHANGES.txt

@@ -152,6 +152,11 @@ Bug Fixes
 * LUCENE-5192: IndexWriter could allow adding same field name with different
   DocValueTypes under some circumstances. (Shai Erera)
 
+* LUCENE-5191: SimpleHTMLEncoder in Highlighter module broke Unicode
+  outside BMP because it encoded UTF-16 chars instead of codepoints.
+  The escaping of codepoints > 127 was removed (not needed for valid HTML)
+  and missing escaping for ' and / was added.  (Uwe Schindler)
+  
 API Changes
 
 * LUCENE-5094: Add ramBytesUsed() to MultiDocValues.OrdinalMap.

lucene/highlighter/src/java/org/apache/lucene/search/highlight/SimpleHTMLEncoder.java

@@ -47,34 +47,28 @@ public class SimpleHTMLEncoder implements Encoder
     {
       char ch = plainText.charAt(index);
 
-      switch (ch)
-      {
+      switch (ch) {
       case '"':
         result.append(""");
         break;
-
       case '&':
         result.append("&");
         break;
-
       case '<':
         result.append("&lt;");
         break;
-
       case '>':
         result.append("&gt;");
         break;
-
+      case '\'':
+        result.append("&#x27;");
+        break;
+      case '/':
+        result.append("&#x2F;");
+        break;
       default:
-           if (ch < 128)
-           {
         result.append(ch);
       }
-           else
-             {
-                 result.append("&#").append((int)ch).append(";");
-             }
-      }
     }
 
     return result.toString();

lucene/highlighter/src/test/org/apache/lucene/search/vectorhighlight/SimpleFragmentsBuilderTest.java

@@ -85,7 +85,7 @@ public class SimpleFragmentsBuilderTest extends AbstractTestCase {
     SimpleFragmentsBuilder sfb = new SimpleFragmentsBuilder();
     String[] preTags = { "[" };
     String[] postTags = { "]" };
-    assertEquals( "<h1> [a] </h1>",
+    assertEquals( "<h1> [a] </h1>",
         sfb.createFragment( reader, 0, F, ffl, preTags, postTags, new SimpleHTMLEncoder() ) );
   }