From 73793898a98091f7a838a825d259f2734c817718 Mon Sep 17 00:00:00 2001
From: parrt <parrt@antlr.org>
Date: Wed, 11 Jan 2012 11:21:05 -0800
Subject: [PATCH] update grammars

[git-p4: depot-paths = "//depot/code/antlr4/main/": change = 9856]
---
 tool/playground/A.g4       | 16 ++++++++
 tool/playground/TestA.java | 82 ++++++++++++++++++++++++++++++++++++++
 tool/playground/U.g        | 21 +++++-----
 3 files changed, 109 insertions(+), 10 deletions(-)
 create mode 100644 tool/playground/A.g4
 create mode 100644 tool/playground/TestA.java

diff --git a/tool/playground/A.g4 b/tool/playground/A.g4
new file mode 100644
index 000000000..1662f6801
--- /dev/null
+++ b/tool/playground/A.g4
@@ -0,0 +1,16 @@
+grammar A;
+
+s : q=e {System.out.println("result = "+$e.v);} ;
+
+e returns [int v]
+  : a=e '*' b=e {$v = $a.v * $b.v;}	-> mult
+  | a=e '+' b=e {$v = $a.v + $b.v;}	-> add
+  | INT 	{$v = $INT.int;}
+  | '(' x=e ')' {$v = $x.v;}
+  | e '++' 				-> inc
+  | e '--'
+  | ID					-> anID
+  ;
+
+INT : '0'..'9'+ ;
+WS : (' '|'\n')+ {skip();} ;
diff --git a/tool/playground/TestA.java b/tool/playground/TestA.java
new file mode 100644
index 000000000..5b5fc3cc1
--- /dev/null
+++ b/tool/playground/TestA.java
@@ -0,0 +1,82 @@
+/*
+ [The "BSD license"]
+ Copyright (c) 2011 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.
+ */
+
+import org.antlr.v4.runtime.*;
+import org.antlr.v4.runtime.tree.ParseTree;
+import org.antlr.v4.runtime.tree.ParseTreeWalker;
+
+public class TestA {
+	public static class Do extends BlankAListener {
+		Parser p;
+		public Do(Parser p ) { this.p = p; }
+		@Override
+		public void exitEveryRule(ParserRuleContext<Token> ctx) {
+			System.out.println("exit "+ctx.toStringTree(p));
+		}
+
+		@Override
+		public void enterRule(AParser.eContext ctx) {
+			System.out.println("enter alt w/o -> label: "+ctx.toInfoString(p));
+		}
+
+		@Override
+		public void visitTerminal(ParserRuleContext<Token> ctx, Token symbol) {
+			if ( ctx instanceof AParser.eContext && symbol.getType()==AParser.INT ) {
+				AParser.eContext ectx = (AParser.eContext)ctx;
+				ectx.v = Integer.valueOf(symbol.getText());
+			}
+		}
+
+		@Override
+		public void exitRule(AParser.multContext ctx) {
+			System.out.println("mult "+ctx.a.v+" * "+ctx.b.v);
+			ctx.v = ctx.a.v * ctx.b.v; // repeat of what parser did--set return value
+		}
+		@Override
+		public void exitRule(AParser.addContext ctx) {
+			System.out.println("add "+ctx.a.v+" + "+ctx.b.v);
+			ctx.v = ctx.a.v + ctx.b.v;
+		}
+	}
+	public static void main(String[] args) throws Exception {
+		ALexer lexer = new ALexer(new ANTLRFileStream(args[0]));
+		CommonTokenStream tokens = new CommonTokenStream(lexer);
+		AParser p = new AParser(tokens);
+		p.setBuildParseTree(true);
+//		p.addParseListener(new Do(p));
+		ParserRuleContext<Token> t = p.s();
+		System.out.println("tree = "+t.toStringTree(p));
+
+		ParseTreeWalker walker = new ParseTreeWalker();
+		Do doer = new Do(p);
+		walker.walk(doer, t);
+		AParser.eContext ectx = (AParser.eContext)t.getChild(0);
+		System.out.println("result from tree walk = "+ ectx.v);
+	}
+}
diff --git a/tool/playground/U.g b/tool/playground/U.g
index 66c87ef11..ae193e846 100644
--- a/tool/playground/U.g
+++ b/tool/playground/U.g
@@ -1,12 +1,13 @@
 grammar U;
-s : '{' stat* '}' ;
-// if x then break else if y then return else break
-// still ambig: if x then if y then break else break
-stat: 'if' ID 'then' stat ('else' stat)?
-    | 'break'
-    | 'return'
-    ;
-
-INT : '0'..'9'+ ;
+s @after {System.out.println($ctx.toStringTree(this));} : e EOF ;
+e : e '.' ID
+  | e '.' 'this'
+  | '-' e
+  | e '*' e
+  | e ('+'|'-') e
+  | INT
+  | ID
+  ;
 ID : 'a'..'z'+ ;
-WS : (' '|'\n')+ {skip();} ;
+INT : '0'..'9'+ ;
+WS : (' '|'\n') {skip();} ;