Add compact option to @source.match

Improve processing speed by returning @scanner.captures.compact if @compact=true and @scanner if compact=false.

lib/rexml/parsers/baseparser.rb

@@ -274,8 +274,8 @@ def pull_event
             return [ :elementdecl, @source.match( ELEMENTDECL_PATTERN, true )[1] ]
 
           when ENTITY_START
-            match = @source.match( ENTITYDECL, true ).compact
-            match[0] = :entitydecl
+            match = @source.match( ENTITYDECL, true, true )
+            match = match.nil? ? [:entitydecl] : [:entitydecl, *match]
             ref = false
             if match[1] == '%'
               ref = true

lib/rexml/source.rb

@@ -68,13 +68,18 @@ def encoding=(enc)
     def read
     end
 
-    def match(pattern, cons=false)
+    def match(pattern, cons=false, compact=false)
       if cons
         @scanner.scan(pattern)
       else
         @scanner.check(pattern)
       end
-      @scanner.matched? ? [@scanner.matched, *@scanner.captures] : nil
+
+      if @scanner.matched?
+        compact ? @scanner.captures.compact : @scanner
+      else
+        nil
+      end
     end
 
     # @return true if the Source is exhausted
@@ -156,7 +161,7 @@ def read
       end
     end
 
-    def match( pattern, cons=false )
+    def match( pattern, cons=false, compact=false)
       if cons
         @scanner.scan(pattern)
       else
@@ -175,7 +180,11 @@ def match( pattern, cons=false )
         end
       end
 
-      @scanner.matched? ? [@scanner.matched, *@scanner.captures] : nil
+      if @scanner.matched?
+        compact ? @scanner.captures.compact : @scanner
+      else
+        nil
+      end
     end
 
     def empty?