playing with initial matcher

runtime/Java/src/org/antlr/v4/runtime/tree/ParseTreePatternMatcher.java

@@ -0,0 +1,70 @@
+/*
+ * [The "BSD license"]
+ *  Copyright (c) 2012 Terence Parr
+ *  Copyright (c) 2012 Sam Harwell
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.antlr.v4.runtime.tree;
+
+import org.antlr.v4.runtime.Parser;
+import org.antlr.v4.runtime.misc.Pair;
+
+import java.util.Iterator;
+import java.util.List;
+
+public class ParseTreePatternMatcher {
+	protected Parser parser;
+
+	public static class Match {
+		protected ParseTree subtree;
+		protected List<Pair<String,? extends ParseTree>> labels;
+	}
+
+	public static class MatchIterator implements Iterator<Match> {
+		@Override
+		public boolean hasNext() {
+			return false;
+		}
+
+		@Override
+		public Match next() {
+			return null;
+		}
+
+		@Override
+		public void remove() {
+		}
+	}
+
+	public ParseTreePatternMatcher(Parser parser) {
+		this.parser = parser;
+	}
+
+	public MatchIterator findAll(int ruleIndex, String pattern) {
+		return null;
+	}
+}