1 files changed, 45 insertions, 0 deletions
diff --git a/runtime/Java/src/main/java/org/antlr/runtime/CharStreamState.java b/runtime/Java/src/main/java/org/antlr/runtime/CharStreamState.java
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+++ b/runtime/Java/src/main/java/org/antlr/runtime/CharStreamState.java
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+/*
+ [The "BSD license"]
+ Copyright (c) 2005-2009 Terence Parr
+ 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.runtime;
+
+/** When walking ahead with cyclic DFA or for syntactic predicates,
+ *  we need to record the state of the input stream (char index,
+ *  line, etc...) so that we can rewind the state after scanning ahead.
+ *
+ *  This is the complete state of a stream.
+ */
+public class CharStreamState {
+	/** Index into the char stream of next lookahead char */
+	int p;
+
+	/** What line number is the scanner at before processing buffer[p]? */
+	int line;
+	
+	/** What char position 0..n-1 in line is scanner before processing buffer[p]? */
+	int charPositionInLine;
+}