src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/regexp/joni/ast/StringNode.java

rev 52890 : 8223904: Improve Nashorn matching
Reviewed-by: jlaskey, sundar, mschoene, rhalade

*** 25,44 ****
  @SuppressWarnings("javadoc")
  public final class StringNode extends Node implements StringType {
  
      private static final int NODE_STR_MARGIN = 16;
      private static final int NODE_STR_BUF_SIZE = 24;
-     public static final StringNode EMPTY = new StringNode(null, Integer.MAX_VALUE, Integer.MAX_VALUE);
  
      public char[] chars;
      public int p;
      public int end;
  
      public int flag;
  
      public StringNode() {
!         this.chars = new char[NODE_STR_BUF_SIZE];
      }
  
      public StringNode(final char[] chars, final int p, final int end) {
          this.chars = chars;
          this.p = p;
--- 25,49 ----
  @SuppressWarnings("javadoc")
  public final class StringNode extends Node implements StringType {
  
      private static final int NODE_STR_MARGIN = 16;
      private static final int NODE_STR_BUF_SIZE = 24;
  
      public char[] chars;
      public int p;
      public int end;
  
      public int flag;
  
      public StringNode() {
!         this(NODE_STR_BUF_SIZE);
!     }
! 
!     private StringNode(int size) {
!         this.chars = new char[size];
!         this.p = 0;
!         this.end = 0;
      }
  
      public StringNode(final char[] chars, final int p, final int end) {
          this.chars = chars;
          this.p = p;
*** 49,58 ****
--- 54,70 ----
      public StringNode(final char c) {
          this();
          chars[end++] = c;
      }
  
+     /**
+      * Create a new empty StringNode.
+      */
+     public static StringNode createEmpty() {
+         return new StringNode(0);
+     }
+ 
      /* Ensure there is ahead bytes available in node's buffer
       * (assumes that the node is not shared)
       */
      public void ensure(final int ahead) {
          final int len = (end - p) + ahead;