tool/src/test/java/org/antlr/test/TestAttributes.java

/*
 * [The "BSD license"]
 *  Copyright (c) 2010 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.test;

import org.antlr.Tool;
import org.antlr.codegen.CodeGenerator;
import org.antlr.grammar.v3.ANTLRParser;
import org.antlr.grammar.v3.ActionTranslator;
import org.antlr.runtime.CommonToken;
import org.stringtemplate.v4.ST;
import org.stringtemplate.v4.STGroup;
import org.antlr.tool.*;
import org.junit.Test;

import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;

import static org.junit.Assert.*;

/** Check the $x, $x.y attributes.  For checking the actual
 *  translation, assume the Java target.  This is still a great test
 *  for the semantics of the $x.y stuff regardless of the target.
 */
public class TestAttributes extends BaseTest {

	/** Public default constructor used by TestRig */
	public TestAttributes() {
	}

	@Test public void testEscapedLessThanInAction() throws Exception {
		Grammar g = new Grammar();
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		String action = "i<3; '<xmltag>'";
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),0);
		String expecting = action;
		String rawTranslation =
			translator.translate();
		STGroup templates =
			new STGroup();
		ST actionST = new ST(templates, "<action>");
		actionST.add("action", rawTranslation);
		String found = actionST.render();
		assertEquals(expecting, found);
	}

	@Test public void testEscaped$InAction() throws Exception {
		String action = "int \\$n; \"\\$in string\\$\"";
		String expecting = "int $n; \"$in string$\"";
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"@members {"+action+"}\n"+
				"a[User u, int i]\n" +
				"        : {"+action+"}\n" +
				"        ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"a",
				new CommonToken(ANTLRParser.ACTION,action),0);
		String found = translator.translate();		assertEquals(expecting, found);
	}

	@Test public void testArguments() throws Exception {
		String action = "$i; $i.x; $u; $u.x";
		String expecting = "i; i.x; u; u.x";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a[User u, int i]\n" +
				"        : {"+action+"}\n" +
				"        ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testComplicatedArgParsing() throws Exception {
		String action = "x, (*a).foo(21,33), 3.2+1, '\\n', "+
			"\"a,oo\\nick\", {bl, \"fdkj\"eck}";
		String expecting = "x, (*a).foo(21,33), 3.2+1, '\\n', \"a,oo\\nick\", {bl, \"fdkj\"eck}";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);

		// now check in actual grammar.
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a[User u, int i]\n" +
				"        : A a["+action+"] B\n" +
				"        ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =	translator.translate();
		assertEquals(expecting, rawTranslation);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testBracketArgParsing() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);

		// now check in actual grammar.
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a[String[\\] ick, int i]\n" +
				"        : A \n"+
				"        ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		Rule r = g.getRule("a");
		AttributeScope parameters = r.parameterScope;
		List<Attribute> attrs = parameters.getAttributes();
		assertEquals("attribute mismatch","String[] ick",attrs.get(0).decl.toString());
		assertEquals("parameter name mismatch","ick",attrs.get(0).name);
		assertEquals("declarator mismatch", "String[]", attrs.get(0).type);

		assertEquals("attribute mismatch","int i",attrs.get(1).decl.toString());
		assertEquals("parameter name mismatch","i",attrs.get(1).name);
		assertEquals("declarator mismatch", "int", attrs.get(1).type);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testStringArgParsing() throws Exception {
		String action = "34, '{', \"it's<\", '\"', \"\\\"\", 19";
		String expecting = "34, '{', \"it's<\", '\"', \"\\\"\", 19";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);

		// now check in actual grammar.
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a[User u, int i]\n" +
				"        : A a["+action+"] B\n" +
				"        ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =	translator.translate();
		assertEquals(expecting, rawTranslation);

		List<String> expectArgs = new ArrayList<String>() {
			{add("34");}
			{add("'{'");}
			{add("\"it's<\"");}
			{add("'\"'");}
			{add("\"\\\"\"");} // that's "\""
			{add("19");}
		};
		List<String> actualArgs = CodeGenerator.getListOfArgumentsFromAction(action, ',');
		assertEquals("args mismatch", expectArgs, actualArgs);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testComplicatedSingleArgParsing() throws Exception {
		String action = "(*a).foo(21,33,\",\")";
		String expecting = "(*a).foo(21,33,\",\")";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);

		// now check in actual grammar.
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a[User u, int i]\n" +
				"        : A a["+action+"] B\n" +
				"        ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =	translator.translate();
		assertEquals(expecting, rawTranslation);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testArgWithLT() throws Exception {
		String action = "34<50";
		String expecting = "34<50";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);

		// now check in actual grammar.
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a[boolean b]\n" +
				"        : A a["+action+"] B\n" +
				"        ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();
		assertEquals(expecting, rawTranslation);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testGenericsAsArgumentDefinition() throws Exception {
		String action = "$foo.get(\"ick\");";
		String expecting = "foo.get(\"ick\");";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		String grammar =
			"parser grammar T;\n"+
				"a[HashMap<String,String> foo]\n" +
				"        : {"+action+"}\n" +
				"        ;";
		Grammar g = new Grammar(grammar);
		Rule ra = g.getRule("a");
		List<Attribute> attrs = ra.parameterScope.getAttributes();
		assertEquals("attribute mismatch","HashMap<String,String> foo",attrs.get(0).decl.toString());
		assertEquals("parameter name mismatch","foo",attrs.get(0).name);
		assertEquals("declarator mismatch", "HashMap<String,String>", attrs.get(0).type);

		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testGenericsAsArgumentDefinition2() throws Exception {
		String action = "$foo.get(\"ick\"); x=3;";
		String expecting = "foo.get(\"ick\"); x=3;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		String grammar =
			"parser grammar T;\n"+
				"a[HashMap<String,String> foo, int x, List<String> duh]\n" +
				"        : {"+action+"}\n" +
				"        ;";
		Grammar g = new Grammar(grammar);
		Rule ra = g.getRule("a");
		List<Attribute> attrs = ra.parameterScope.getAttributes();

		assertEquals("attribute mismatch","HashMap<String,String> foo",attrs.get(0).decl.toString().trim());
		assertEquals("parameter name mismatch","foo",attrs.get(0).name);
		assertEquals("declarator mismatch", "HashMap<String,String>", attrs.get(0).type);

		assertEquals("attribute mismatch","int x",attrs.get(1).decl.toString().trim());
		assertEquals("parameter name mismatch","x",attrs.get(1).name);
		assertEquals("declarator mismatch", "int", attrs.get(1).type);

		assertEquals("attribute mismatch","List<String> duh",attrs.get(2).decl.toString().trim());
		assertEquals("parameter name mismatch","duh",attrs.get(2).name);
		assertEquals("declarator mismatch", "List<String>", attrs.get(2).type);

		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testGenericsAsReturnValue() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		String grammar =
			"parser grammar T;\n"+
				"a returns [HashMap<String,String> foo] : ;\n";
		Grammar g = new Grammar(grammar);
		Rule ra = g.getRule("a");
		List<Attribute> attrs = ra.returnScope.getAttributes();
		assertEquals("attribute mismatch","HashMap<String,String> foo",attrs.get(0).decl.toString());
		assertEquals("parameter name mismatch","foo",attrs.get(0).name);
		assertEquals("declarator mismatch", "HashMap<String,String>", attrs.get(0).type);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testComplicatedArgParsingWithTranslation() throws Exception {
		String action = "x, $A.text+\"3242\", (*$A).foo(21,33), 3.2+1, '\\n', "+
			"\"a,oo\\nick\", {bl, \"fdkj\"eck}";
		String expecting = "x, (A1!=null?A1.getText():null)+\"3242\", (*A1).foo(21,33), 3.2+1, '\\n', \"a,oo\\nick\", {bl, \"fdkj\"eck}";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);

		// now check in actual grammar.
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a[User u, int i]\n" +
				"        : A a["+action+"] B\n" +
				"        ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	/** $x.start refs are checked during translation not before so ANTLR misses
	 the fact that rule r has refs to predefined attributes if the ref is after
	 the def of the method or self-referential.  Actually would be ok if I didn't
	 convert actions to strings; keep as templates.
	 June 9, 2006: made action translation leave templates not strings
	 */
	@Test public void testRefToReturnValueBeforeRefToPredefinedAttr() throws Exception {
		String action = "$x.foo";
		String expecting = "(x!=null?((t.b_return)x).foo:0)";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a : x=b {"+action+"} ;\n" +
				"b returns [int foo] : B {$b.start} ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRuleLabelBeforeRefToPredefinedAttr() throws Exception {
		// As of Mar 2007, I'm removing unused labels.  Unfortunately,
		// the action is not seen until code gen.  Can't see $x.text
		// before stripping unused labels.  We really need to translate
		// actions first so code gen logic can use info.
		String action = "$x.text";
		String expecting = "(x!=null?input.toString(x.start,x.stop):null)";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a : x=b {###"+action+"!!!} ;\n" +
				"b : B ;\n");
		Tool antlr = newTool();

		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // codegen phase sets some vars we need
		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);
		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testInvalidArguments() throws Exception {
		String action = "$x";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a[User u, int i]\n" +
				"        : {"+action+"}\n" +
				"        ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator = new ActionTranslator(generator,
			"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		int expectedMsgID = ErrorManager.MSG_UNKNOWN_SIMPLE_ATTRIBUTE;
		Object expectedArg = "x";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg);
		checkError(equeue, expectedMessage);
	}

	@Test public void testReturnValue() throws Exception {
		String action = "$x.i";
		String expecting = "x";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a returns [int i]\n" +
				"        : 'a'\n" +
				"        ;\n" +
				"b : x=a {"+action+"} ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"b",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found =	translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testActionNotMovedToSynPred() throws Exception {
		String action = "$b = true;";
		String expecting = "retval.b = true;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
			"options {output=AST;}\n" + // push b into retval struct
			"a returns [boolean b]\n" +
			"options {backtrack=true;}\n" +
			"   : 'a' {"+action+"}\n" +
			"   | 'a'\n" +
			"   ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"a",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found =	translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testReturnValueWithNumber() throws Exception {
		String action = "$x.i1";
		String expecting = "x";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a returns [int i1]\n" +
				"        : 'a'\n" +
				"        ;\n" +
				"b : x=a {"+action+"} ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"b",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testReturnValues() throws Exception {
		String action = "$i; $i.x; $u; $u.x";
		String expecting = "retval.i; retval.i.x; retval.u; retval.u.x";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a returns [User u, int i]\n" +
				"        : {"+action+"}\n" +
				"        ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	/* regression test for ANTLR-46 */
	@Test public void testReturnWithMultipleRuleRefs() throws Exception {
		String action1 = "$obj = $rule2.obj;";
		String action2 = "$obj = $rule3.obj;";
		String expecting1 = "obj = rule21;";
		String expecting2 = "obj = rule32;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n" +
				"rule1 returns [ Object obj ]\n" +
				":	rule2 { "+action1+" }\n" +
				"|	rule3 { "+action2+" }\n" +
				";\n"+
				"rule2 returns [ Object obj ]\n"+
				":	foo='foo' { $obj = $foo.text; }\n"+
				";\n"+
				"rule3 returns [ Object obj ]\n"+
				":	bar='bar' { $obj = $bar.text; }\n"+
				";");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		int i = 0;
		String action = action1;
		String expecting = expecting1;
		do {
			ActionTranslator translator = new ActionTranslator(generator,"rule1",
				new CommonToken(ANTLRParser.ACTION,action),i+1);
			String found = translator.translate();
			assertEquals(expecting, found);
			action = action2;
			expecting = expecting2;
		} while (i++ < 1);
		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testInvalidReturnValues() throws Exception {
		String action = "$x";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a returns [User u, int i]\n" +
				"        : {"+action+"}\n" +
				"        ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		int expectedMsgID = ErrorManager.MSG_UNKNOWN_SIMPLE_ATTRIBUTE;
		Object expectedArg = "x";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg);
		checkError(equeue, expectedMessage);
	}

	@Test public void testTokenLabels() throws Exception {
		String action = "$id; $f; $id.text; $id.getText(); $id.dork " +
			"$id.type; $id.line; $id.pos; " +
			"$id.channel; $id.index;";
		String expecting = "id; f; (id!=null?id.getText():null); id.getText(); id.dork (id!=null?id.getType():0); (id!=null?id.getLine():0); (id!=null?id.getCharPositionInLine():0); (id!=null?id.getChannel():0); (id!=null?id.getTokenIndex():0);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a : id=ID f=FLOAT {"+action+"}\n" +
				"  ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRuleLabels() throws Exception {
		String action = "$r.x; $r.start;\n $r.stop;\n $r.tree; $a.x; $a.stop;";
		String expecting = "(r!=null?((t.a_return)r).x:0); (r!=null?(r.start):null);" + newline +
			"\t\t\t (r!=null?(r.stop):null);" + newline +
			"\t\t\t (r!=null?((Object)r.getTree()):null); (r!=null?((t.a_return)r).x:0); (r!=null?(r.stop):null);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a returns [int x]\n" +
				"  :\n" +
				"  ;\n"+
				"b : r=a {###"+action+"!!!}\n" +
				"  ;");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // codegen phase sets some vars we need
		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testAmbiguRuleRef() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a : A a {$a.text} | B ;");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		// error(132): <string>:2:9: reference $a is ambiguous; rule a is enclosing rule and referenced in the production
		assertEquals("unexpected errors: "+equeue, 1, equeue.errors.size());
	}

	@Test public void testRuleLabelsWithSpecialToken() throws Exception {
		String action = "$r.x; $r.start; $r.stop; $r.tree; $a.x; $a.stop;";
		String expecting = "(r!=null?((t.a_return)r).x:0); (r!=null?((MYTOKEN)r.start):null); (r!=null?((MYTOKEN)r.stop):null); (r!=null?((Object)r.getTree()):null); (r!=null?((t.a_return)r).x:0); (r!=null?((MYTOKEN)r.stop):null);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"options {TokenLabelType=MYTOKEN;}\n"+
				"a returns [int x]\n" +
				"  :\n" +
				"  ;\n"+
				"b : r=a {###"+action+"!!!}\n" +
				"  ;");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // codegen phase sets some vars we need

		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testForwardRefRuleLabels() throws Exception {
		String action = "$r.x; $r.start; $r.stop; $r.tree; $a.x; $a.tree;";
		String expecting = "(r!=null?((t.a_return)r).x:0); (r!=null?(r.start):null); (r!=null?(r.stop):null); (r!=null?((Object)r.getTree()):null); (r!=null?((t.a_return)r).x:0); (r!=null?((Object)r.getTree()):null);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"b : r=a {###"+action+"!!!}\n" +
				"  ;\n" +
				"a returns [int x]\n" +
				"  : ;\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // codegen phase sets some vars we need

		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testInvalidRuleLabelAccessesParameter() throws Exception {
		String action = "$r.z";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a[int z] returns [int x]\n" +
				"  :\n" +
				"  ;\n"+
				"b : r=a[3] {"+action+"}\n" +
				"  ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator = new ActionTranslator(generator, "b",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		int expectedMsgID = ErrorManager.MSG_INVALID_RULE_PARAMETER_REF;
		Object expectedArg = "a";
		Object expectedArg2 = "z";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testInvalidRuleLabelAccessesScopeAttribute() throws Exception {
		String action = "$r.n";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a\n" +
				"scope { int n; }\n" +
				"  :\n" +
				"  ;\n"+
				"b : r=a[3] {"+action+"}\n" +
				"  ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator = new ActionTranslator(generator, "b",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		int expectedMsgID = ErrorManager.MSG_INVALID_RULE_SCOPE_ATTRIBUTE_REF;
		Object expectedArg = "a";
		Object expectedArg2 = "n";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testInvalidRuleAttribute() throws Exception {
		String action = "$r.blort";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a[int z] returns [int x]\n" +
				"  :\n" +
				"  ;\n"+
				"b : r=a[3] {"+action+"}\n" +
				"  ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator = new ActionTranslator(generator, "b",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		int expectedMsgID = ErrorManager.MSG_UNKNOWN_RULE_ATTRIBUTE;
		Object expectedArg = "a";
		Object expectedArg2 = "blort";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testMissingRuleAttribute() throws Exception {
		String action = "$r";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a[int z] returns [int x]\n" +
				"  :\n" +
				"  ;\n"+
				"b : r=a[3] {"+action+"}\n" +
				"  ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator = new ActionTranslator(generator, "b",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();

		int expectedMsgID = ErrorManager.MSG_ISOLATED_RULE_SCOPE;
		Object expectedArg = "r";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testMissingUnlabeledRuleAttribute() throws Exception {
		String action = "$a";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a returns [int x]:\n" +
				"  ;\n"+
				"b : a {"+action+"}\n" +
				"  ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator = new ActionTranslator(generator, "b",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();

		int expectedMsgID = ErrorManager.MSG_ISOLATED_RULE_SCOPE;
		Object expectedArg = "a";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg);
		checkError(equeue, expectedMessage);
	}

	@Test public void testNonDynamicAttributeOutsideRule() throws Exception {
		String action = "public void foo() { $x; }";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"@members {'+action+'}\n" +
				"a : ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator = new ActionTranslator(generator,
			null,
			new CommonToken(ANTLRParser.ACTION,action),0);
		String found = translator.translate();		assertEquals(expecting, found);

		int expectedMsgID = ErrorManager.MSG_ATTRIBUTE_REF_NOT_IN_RULE;
		Object expectedArg = "x";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg);
		checkError(equeue, expectedMessage);
	}

	@Test public void testNonDynamicAttributeOutsideRule2() throws Exception {
		String action = "public void foo() { $x.y; }";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"@members {'+action+'}\n" +
				"a : ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator = new ActionTranslator(generator,
			null,
			new CommonToken(ANTLRParser.ACTION,action),0);
		String found = translator.translate();
		assertEquals(expecting, found);

		int expectedMsgID = ErrorManager.MSG_ATTRIBUTE_REF_NOT_IN_RULE;
		Object expectedArg = "x";
		Object expectedArg2 = "y";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	// D Y N A M I C A L L Y  S C O P E D  A T T R I B U T E S

	@Test public void testBasicGlobalScope() throws Exception {
		String action = "$Symbols::names.add($id.text);";
		String expecting = "Symbols_stack.peek().names.add((id!=null?id.getText():null));";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"scope Symbols {\n" +
				"  int n;\n" +
				"  List names;\n" +
				"}\n" +
				"a scope Symbols; : (id=ID ';' {"+action+"} )+\n" +
				"  ;\n" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testUnknownGlobalScope() throws Exception {
		String action = "$Symbols::names.add($id.text);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a scope Symbols; : (id=ID ';' {"+action+"} )+\n" +
				"  ;\n" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);

		assertEquals("unexpected errors: "+equeue, 2, equeue.errors.size());

		int expectedMsgID = ErrorManager.MSG_UNKNOWN_DYNAMIC_SCOPE;
		Object expectedArg = "Symbols";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg);
		checkError(equeue, expectedMessage);
	}

	@Test public void testIndexedGlobalScope() throws Exception {
		String action = "$Symbols[-1]::names.add($id.text);";
		String expecting =
			"Symbols_stack.elementAt(Symbols_stack.size()-1-1).names.add((id!=null?id.getText():null));";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"scope Symbols {\n" +
				"  int n;\n" +
				"  List names;\n" +
				"}\n" +
				"a scope Symbols; : (id=ID ';' {"+action+"} )+\n" +
				"  ;\n" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void test0IndexedGlobalScope() throws Exception {
		String action = "$Symbols[0]::names.add($id.text);";
		String expecting =
			"Symbols_stack.elementAt(0).names.add((id!=null?id.getText():null));";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"scope Symbols {\n" +
				"  int n;\n" +
				"  List names;\n" +
				"}\n" +
				"a scope Symbols; : (id=ID ';' {"+action+"} )+\n" +
				"  ;\n" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testAbsoluteIndexedGlobalScope() throws Exception {
		String action = "$Symbols[3]::names.add($id.text);";
		String expecting =
			"Symbols_stack.elementAt(3).names.add((id!=null?id.getText():null));";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"scope Symbols {\n" +
				"  int n;\n" +
				"  List names;\n" +
				"}\n" +
				"a scope Symbols; : (id=ID ';' {"+action+"} )+\n" +
				"  ;\n" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testScopeAndAttributeWithUnderscore() throws Exception {
		String action = "$foo_bar::a_b;";
		String expecting = "foo_bar_stack.peek().a_b;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"scope foo_bar {\n" +
				"  int a_b;\n" +
				"}\n" +
				"a scope foo_bar; : (ID {"+action+"} )+\n" +
				"  ;\n" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testSharedGlobalScope() throws Exception {
		String action = "$Symbols::x;";
		String expecting = "Symbols_stack.peek().x;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"scope Symbols {\n" +
				"  String x;\n" +
				"}\n" +
				"a\n"+
				"scope { int y; }\n"+
				"scope Symbols;\n" +
				" : b {"+action+"}\n" +
				" ;\n" +
				"b : ID {$Symbols::x=$ID.text} ;\n" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testGlobalScopeOutsideRule() throws Exception {
		String action = "public void foo() {$Symbols::names.add('foo');}";
		String expecting = "public void foo() {Symbols_stack.peek().names.add('foo');}";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"scope Symbols {\n" +
				"  int n;\n" +
				"  List names;\n" +
				"}\n" +
				"@members {'+action+'}\n" +
				"a : \n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRuleScopeOutsideRule() throws Exception {
		String action = "public void foo() {$a::name;}";
		String expecting = "public void foo() {a_stack.peek().name;}";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"@members {"+action+"}\n" +
				"a\n" +
				"scope { String name; }\n" +
				"  : {foo();}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,
			null,
			new CommonToken(ANTLRParser.ACTION,action),0);
		String found = translator.translate();		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testBasicRuleScope() throws Exception {
		String action = "$a::n;";
		String expecting = "a_stack.peek().n;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a\n" +
				"scope {\n" +
				"  int n;\n" +
				"} : {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testUnqualifiedRuleScopeAccessInsideRule() throws Exception {
		String action = "$n;";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a\n" +
				"scope {\n" +
				"  int n;\n" +
				"} : {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates

		int expectedMsgID = ErrorManager.MSG_ISOLATED_RULE_ATTRIBUTE;
		Object expectedArg = "n";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg,
				expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testIsolatedDynamicRuleScopeRef() throws Exception {
		String action = "$a;"; // refers to stack not top of stack
		String expecting = "a_stack;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a\n" +
				"scope {\n" +
				"  int n;\n" +
				"} : b ;\n" +
				"b : {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator, "b",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testDynamicRuleScopeRefInSubrule() throws Exception {
		String action = "$a::n;";
		String expecting = "a_stack.peek().n;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a\n" +
				"scope {\n" +
				"  float n;\n" +
				"} : b ;\n" +
				"b : {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator, "b",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testIsolatedGlobalScopeRef() throws Exception {
		String action = "$Symbols;";
		String expecting = "Symbols_stack;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"scope Symbols {\n" +
				"  String x;\n" +
				"}\n" +
				"a\n"+
				"scope { int y; }\n"+
				"scope Symbols;\n" +
				" : b {"+action+"}\n" +
				" ;\n" +
				"b : ID {$Symbols::x=$ID.text} ;\n" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRuleScopeFromAnotherRule() throws Exception {
		String action = "$a::n;"; // must be qualified
		String expecting = "a_stack.peek().n;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a\n" +
				"scope {\n" +
				"  boolean n;\n" +
				"} : b\n" +
				"  ;\n" +
				"b : {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator, "b",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testFullyQualifiedRefToCurrentRuleParameter() throws Exception {
		String action = "$a.i;";
		String expecting = "i;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a[int i]: {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testFullyQualifiedRefToCurrentRuleRetVal() throws Exception {
		String action = "$a.i;";
		String expecting = "retval.i;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a returns [int i, int j]: {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testSetFullyQualifiedRefToCurrentRuleRetVal() throws Exception {
		String action = "$a.i = 1;";
		String expecting = "retval.i = 1;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a returns [int i, int j]: {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testIsolatedRefToCurrentRule() throws Exception {
		String action = "$a;";
		String expecting = "";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : 'a' {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates

		int expectedMsgID = ErrorManager.MSG_ISOLATED_RULE_SCOPE;
		Object expectedArg = "a";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg,
				expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testIsolatedRefToRule() throws Exception {
		String action = "$x;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : x=b {"+action+"}\n" +
				"  ;\n" +
				"b : 'b' ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates

		int expectedMsgID = ErrorManager.MSG_ISOLATED_RULE_SCOPE;
		Object expectedArg = "x";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg);
		checkError(equeue, expectedMessage);
	}

	/*  I think these have to be errors $a.x makes no sense.
	@Test public void testFullyQualifiedRefToLabelInCurrentRule() throws Exception {
			String action = "$a.x;";
			String expecting = "x;";

			ErrorQueue equeue = new ErrorQueue();
			ErrorManager.setErrorListener(equeue);
			Grammar g = new Grammar(
				"grammar t;\n"+
					"a : x='a' {"+action+"}\n" +
					"  ;\n");
			Tool antlr = newTool();
			CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
			g.setCodeGenerator(generator);
			generator.genRecognizer(); // forces load of templates
			ActionTranslator translator = new ActionTranslator(generator,"a",
															   new CommonToken(ANTLRParser.ACTION,action),1);
			String rawTranslation =
				translator.translate();
			STGroup templates =
				new STGroup();
			ST actionST = new ST(templates, rawTranslation);
			String found = actionST.render();
			assertEquals(expecting, found);

			assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
		}

	@Test public void testFullyQualifiedRefToListLabelInCurrentRule() throws Exception {
		String action = "$a.x;"; // must be qualified
		String expecting = "list_x;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : x+='a' {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
														   new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}
*/
	@Test public void testFullyQualifiedRefToTemplateAttributeInCurrentRule() throws Exception {
		String action = "$a.st;"; // can be qualified
		String expecting = "retval.st;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n" +
				"options {output=template;}\n"+
				"a : (A->{$A.text}) {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRuleRefWhenRuleHasScope() throws Exception {
		String action = "$b.start;";
		String expecting = "(b1!=null?(b1.start):null);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n" +
				"a : b {###"+action+"!!!} ;\n" +
				"b\n" +
				"scope {\n" +
				"  int n;\n" +
				"} : 'b' \n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates

		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testDynamicScopeRefOkEvenThoughRuleRefExists() throws Exception {
		String action = "$b::n;";
		String expecting = "b_stack.peek().n;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n" +
				"s : b ;\n"+
				"b\n" +
				"scope {\n" +
				"  int n;\n" +
				"} : '(' b ')' {"+action+"}\n" + // refers to current invocation's n
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator, "b",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRefToTemplateAttributeForCurrentRule() throws Exception {
		String action = "$st=null;";
		String expecting = "retval.st =null;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n" +
				"options {output=template;}\n"+
				"a : {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRefToTextAttributeForCurrentRule() throws Exception {
		String action = "$text";
		String expecting = "input.toString(retval.start,input.LT(-1))";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n" +
				"options {output=template;}\n"+
				"a : {###"+action+"!!!}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // codegen phase sets some vars we need
		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRefToStartAttributeForCurrentRule() throws Exception {
		String action = "$start;";
		String expecting = "(retval.start);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n" +
				"a : {###"+action+"!!!}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testTokenLabelFromMultipleAlts() throws Exception {
		String action = "$ID.text;"; // must be qualified
		String action2 = "$INT.text;"; // must be qualified
		String expecting = "(ID1!=null?ID1.getText():null);";
		String expecting2 = "(INT2!=null?INT2.getText():null);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : ID {"+action+"}\n" +
				"  | INT {"+action2+"}\n" +
				"  ;\n" +
				"ID : 'a';\n" +
				"INT : '0';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
		translator = new ActionTranslator(generator,
			"a",
			new CommonToken(ANTLRParser.ACTION,action2),2);
		found = translator.translate();
		assertEquals(expecting2, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRuleLabelFromMultipleAlts() throws Exception {
		String action = "$b.text;"; // must be qualified
		String action2 = "$c.text;"; // must be qualified
		String expecting = "(b1!=null?input.toString(b1.start,b1.stop):null);";
		String expecting2 = "(c2!=null?input.toString(c2.start,c2.stop):null);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : b {###"+action+"!!!}\n" +
				"  | c {^^^"+action2+"&&&}\n" +
				"  ;\n" +
				"b : 'a';\n" +
				"c : '0';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // codegen phase sets some vars we need
		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);
		found = code.substring(code.indexOf("^^^")+3,code.indexOf("&&&"));
		assertEquals(expecting2, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testUnknownDynamicAttribute() throws Exception {
		String action = "$a::x";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a\n" +
				"scope {\n" +
				"  int n;\n" +
				"} : {"+action+"}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"a",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		int expectedMsgID = ErrorManager.MSG_UNKNOWN_DYNAMIC_SCOPE_ATTRIBUTE;
		Object expectedArg = "a";
		Object expectedArg2 = "x";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testUnknownGlobalDynamicAttribute() throws Exception {
		String action = "$Symbols::x";
		String expecting = action;

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"scope Symbols {\n" +
				"  int n;\n" +
				"}\n" +
				"a : {'+action+'}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"a",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		int expectedMsgID = ErrorManager.MSG_UNKNOWN_DYNAMIC_SCOPE_ATTRIBUTE;
		Object expectedArg = "Symbols";
		Object expectedArg2 = "x";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testUnqualifiedRuleScopeAttribute() throws Exception {
		String action = "$n;"; // must be qualified
		String expecting = "$n;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a\n" +
				"scope {\n" +
				"  int n;\n" +
				"} : b\n" +
				"  ;\n" +
				"b : {'+action+'}\n" +
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator =
			new ActionTranslator(generator,
				"b",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();		assertEquals(expecting, found);

		int expectedMsgID = ErrorManager.MSG_UNKNOWN_SIMPLE_ATTRIBUTE;
		Object expectedArg = "n";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testRuleAndTokenLabelTypeMismatch() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : id='foo' id=b\n" +
				"  ;\n" +
				"b : ;\n");
		int expectedMsgID = ErrorManager.MSG_LABEL_TYPE_CONFLICT;
		Object expectedArg = "id";
		Object expectedArg2 = "rule!=token";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testListAndTokenLabelTypeMismatch() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : ids+='a' ids='b'\n" +
				"  ;\n" +
				"b : ;\n");
		int expectedMsgID = ErrorManager.MSG_LABEL_TYPE_CONFLICT;
		Object expectedArg = "ids";
		Object expectedArg2 = "token!=token-list";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testListAndRuleLabelTypeMismatch() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n" +
				"options {output=AST;}\n"+
				"a : bs+=b bs=b\n" +
				"  ;\n" +
				"b : 'b';\n");
		int expectedMsgID = ErrorManager.MSG_LABEL_TYPE_CONFLICT;
		Object expectedArg = "bs";
		Object expectedArg2 = "rule!=rule-list";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testArgReturnValueMismatch() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a[int i] returns [int x, int i]\n" +
				"  : \n" +
				"  ;\n" +
				"b : ;\n");
		int expectedMsgID = ErrorManager.MSG_ARG_RETVAL_CONFLICT;
		Object expectedArg = "i";
		Object expectedArg2 = "a";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testSimplePlusEqualLabel() throws Exception {
		String action = "$ids.size();"; // must be qualified
		String expecting = "list_ids.size();";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"parser grammar t;\n"+
				"a : ids+=ID ( COMMA ids+=ID {"+action+"})* ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"a",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testPlusEqualStringLabel() throws Exception {
		String action = "$ids.size();"; // must be qualified
		String expecting = "list_ids.size();";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : ids+='if' ( ',' ids+=ID {"+action+"})* ;" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"a",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testPlusEqualSetLabel() throws Exception {
		String action = "$ids.size();"; // must be qualified
		String expecting = "list_ids.size();";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : ids+=('a'|'b') ( ',' ids+=ID {"+action+"})* ;" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"a",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testPlusEqualWildcardLabel() throws Exception {
		String action = "$ids.size();"; // must be qualified
		String expecting = "list_ids.size();";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : ids+=. ( ',' ids+=ID {"+action+"})* ;" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator =
			new ActionTranslator(generator,
				"a",
				new CommonToken(ANTLRParser.ACTION,action),1);
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testImplicitTokenLabel() throws Exception {
		String action = "$ID; $ID.text; $ID.getText()";
		String expecting = "ID1; (ID1!=null?ID1.getText():null); ID1.getText()";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : ID {"+action+"} ;" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");

		ActionTranslator translator =
			new ActionTranslator(generator,
				"a",
				new CommonToken(ANTLRParser.ACTION,action),1);
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testImplicitRuleLabel() throws Exception {
		String action = "$r.start;";
		String expecting = "(r1!=null?(r1.start):null);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : r {###"+action+"!!!} ;" +
				"r : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testReuseExistingLabelWithImplicitRuleLabel() throws Exception {
		String action = "$r.start;";
		String expecting = "(x!=null?(x.start):null);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : x=r {###"+action+"!!!} ;" +
				"r : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testReuseExistingListLabelWithImplicitRuleLabel() throws Exception {
		String action = "$r.start;";
		String expecting = "(x!=null?(x.start):null);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"options {output=AST;}\n" +
				"a : x+=r {###"+action+"!!!} ;" +
				"r : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testReuseExistingLabelWithImplicitTokenLabel() throws Exception {
		String action = "$ID.text;";
		String expecting = "(x!=null?x.getText():null);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : x=ID {"+action+"} ;" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testReuseExistingListLabelWithImplicitTokenLabel() throws Exception {
		String action = "$ID.text;";
		String expecting = "(x!=null?x.getText():null);";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : x+=ID {"+action+"} ;" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRuleLabelWithoutOutputOption() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar T;\n"+
				"s : x+=a ;" +
				"a : 'a';\n"+
				"b : 'b';\n"+
				"WS : ' '|'\n';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		int expectedMsgID = ErrorManager.MSG_LIST_LABEL_INVALID_UNLESS_RETVAL_STRUCT;
		Object expectedArg = "x";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testRuleLabelOnTwoDifferentRulesAST() throws Exception {
		String grammar =
			"grammar T;\n"+
				"options {output=AST;}\n"+
				"s : x+=a x+=b {System.out.println($x);} ;" +
				"a : 'a';\n"+
				"b : 'b';\n"+
				"WS : (' '|'\\n') {skip();};\n";
		String expecting = "[a, b]\na b\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
			"s", "a b", false);
		assertEquals(expecting, found);
	}

	@Test public void testRuleLabelOnTwoDifferentRulesTemplate() throws Exception {
		String grammar =
			"grammar T;\n"+
				"options {output=template;}\n"+
				"s : x+=a x+=b {System.out.println($x);} ;" +
				"a : 'a' -> {%{\"hi\"}} ;\n"+
				"b : 'b' -> {%{\"mom\"}} ;\n"+
				"WS : (' '|'\\n') {skip();};\n";
		String expecting = "[hi, mom]\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
			"s", "a b", false);
		assertEquals(expecting, found);
	}

	@Test public void testMissingArgs() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : r ;" +
				"r[int i] : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		int expectedMsgID = ErrorManager.MSG_MISSING_RULE_ARGS;
		Object expectedArg = "r";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testArgsWhenNoneDefined() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : r[32,34] ;" +
				"r : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		int expectedMsgID = ErrorManager.MSG_RULE_HAS_NO_ARGS;
		Object expectedArg = "r";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testReturnInitValue() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : r ;\n" +
				"r returns [int x=0] : 'a' {$x = 4;} ;\n");
		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());

		Rule r = g.getRule("r");
		AttributeScope retScope = r.returnScope;
		List<Attribute> parameters = retScope.getAttributes();
		assertNotNull("missing return action", parameters);
		assertEquals(1, parameters.size());
		String found = parameters.get(0).toString();
		String expecting = "int x=0";
		assertEquals(expecting, found);
	}

	@Test public void testMultipleReturnInitValue() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : r ;\n" +
				"r returns [int x=0, int y, String s=new String(\"foo\")] : 'a' {$x = 4;} ;\n");
		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());

		Rule r = g.getRule("r");
		AttributeScope retScope = r.returnScope;
		List<Attribute> parameters = retScope.getAttributes();
		assertNotNull("missing return action", parameters);
		assertEquals(3, parameters.size());
		assertEquals("int x=0", parameters.get(0).toString());
		assertEquals("int y", parameters.get(1).toString());
		assertEquals("String s=new String(\"foo\")", parameters.get(2).toString());
	}

	@Test public void testCStyleReturnInitValue() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : r ;\n" +
				"r returns [int (*x)()=NULL] : 'a' ;\n");
		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());

		Rule r = g.getRule("r");
		AttributeScope retScope = r.returnScope;
		List<Attribute> parameters = retScope.getAttributes();
		assertNotNull("missing return action", parameters);
		assertEquals(1, parameters.size());
		String found = parameters.get(0).toString();
		String expecting = "int (*)() x=NULL";
		assertEquals(expecting, found);
	}

	@Test public void testArgsWithInitValues() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : r[32,34] ;" +
				"r[int x, int y=3] : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		int expectedMsgID = ErrorManager.MSG_ARG_INIT_VALUES_ILLEGAL;
		Object expectedArg = "y";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testArgsOnToken() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : ID[32,34] ;" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		int expectedMsgID = ErrorManager.MSG_ARGS_ON_TOKEN_REF;
		Object expectedArg = "ID";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testArgsOnTokenInLexer() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"R : 'z' ID[32,34] ;" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		int expectedMsgID = ErrorManager.MSG_RULE_HAS_NO_ARGS;
		Object expectedArg = "ID";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testLabelOnRuleRefInLexer() throws Exception {
		String action = "$i.text";
		String expecting = "(i!=null?i.getText():null)";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"R : 'z' i=ID {"+action+"};" +
				"fragment ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"R",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRefToRuleRefInLexer() throws Exception {
		String action = "$ID.text";
		String expecting = "(ID1!=null?ID1.getText():null)";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"R : 'z' ID {"+action+"};" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"R",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testRefToRuleRefInLexerNoAttribute() throws Exception {
		String action = "$ID";
		String expecting = "ID1";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"R : 'z' ID {"+action+"};" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"R",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testCharLabelInLexer() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"R : x='z' ;\n");

		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testCharListLabelInLexer() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"R : x+='z' ;\n");

		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testWildcardCharLabelInLexer() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"R : x=. ;\n");

		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testWildcardCharListLabelInLexer() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"R : x+=. ;\n");

		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testMissingArgsInLexer() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"A : R ;" +
				"R[int i] : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		int expectedMsgID = ErrorManager.MSG_MISSING_RULE_ARGS;
		Object expectedArg = "R";
		Object expectedArg2 = null;
		// getting a second error @1:12, probably from nextToken
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testLexerRulePropertyRefs() throws Exception {
		String action = "$text $type $line $pos $channel $index $start $stop";
		String expecting = "getText() _type state.tokenStartLine state.tokenStartCharPositionInLine _channel -1 state.tokenStartCharIndex (getCharIndex()-1)";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"R : 'r' {"+action+"};\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"R",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testLexerLabelRefs() throws Exception {
		String action = "$a $b.text $c $d.text";
		String expecting = "a (b!=null?b.getText():null) c (d!=null?d.getText():null)";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"R : a='c' b='hi' c=. d=DUH {"+action+"};\n" +
				"DUH : 'd' ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"R",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testSettingLexerRulePropertyRefs() throws Exception {
		String action = "$text $type=1 $line=1 $pos=1 $channel=1 $index";
		String expecting = "getText() _type=1 state.tokenStartLine=1 state.tokenStartCharPositionInLine=1 _channel=1 -1";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar t;\n"+
				"R : 'r' {"+action+"};\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator =
			new ActionTranslator(generator,
				"R",
				new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testArgsOnTokenInLexerRuleOfCombined() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : R;\n" +
				"R : 'z' ID[32] ;\n" +
				"ID : 'a';\n");

		String lexerGrammarStr = g.getLexerGrammar();
		StringReader sr = new StringReader(lexerGrammarStr);
		Grammar lexerGrammar = new Grammar();
		lexerGrammar.setFileName("<internally-generated-lexer>");
		lexerGrammar.importTokenVocabulary(g);
		lexerGrammar.parseAndBuildAST(sr);
		lexerGrammar.defineGrammarSymbols();
		lexerGrammar.checkNameSpaceAndActions();
		sr.close();

		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, lexerGrammar, "Java");
		lexerGrammar.setCodeGenerator(generator);
		generator.genRecognizer();

		int expectedMsgID = ErrorManager.MSG_RULE_HAS_NO_ARGS;
		Object expectedArg = "ID";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, lexerGrammar, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testMissingArgsOnTokenInLexerRuleOfCombined() throws Exception {
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : R;\n" +
				"R : 'z' ID ;\n" +
				"ID[int i] : 'a';\n");

		String lexerGrammarStr = g.getLexerGrammar();
		StringReader sr = new StringReader(lexerGrammarStr);
		Grammar lexerGrammar = new Grammar();
		lexerGrammar.setFileName("<internally-generated-lexer>");
		lexerGrammar.importTokenVocabulary(g);
		lexerGrammar.parseAndBuildAST(sr);
		lexerGrammar.defineGrammarSymbols();
		lexerGrammar.checkNameSpaceAndActions();
		sr.close();

		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, lexerGrammar, "Java");
		lexerGrammar.setCodeGenerator(generator);
		generator.genRecognizer();

		int expectedMsgID = ErrorManager.MSG_MISSING_RULE_ARGS;
		Object expectedArg = "ID";
		Object expectedArg2 = null;
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, lexerGrammar, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	// T R E E S

	@Test public void testTokenLabelTreeProperty() throws Exception {
		String action = "$id.tree;";
		String expecting = "id_tree;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : id=ID {"+action+"} ;\n" +
				"ID : 'a';\n");

		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		ActionTranslator translator =
			new ActionTranslator(generator,
				"a",
				new CommonToken(ANTLRParser.ACTION,action),1);
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testTokenRefTreeProperty() throws Exception {
		String action = "$ID.tree;";
		String expecting = "ID1_tree;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : ID {"+action+"} ;" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		ActionTranslator translator = new ActionTranslator(generator,"a",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);
	}

	@Test public void testAmbiguousTokenRef() throws Exception {
		String action = "$ID;";
		String expecting = "";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : ID ID {"+action+"};" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		int expectedMsgID = ErrorManager.MSG_NONUNIQUE_REF;
		Object expectedArg = "ID";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg);
		checkError(equeue, expectedMessage);
	}

	@Test public void testAmbiguousTokenRefWithProp() throws Exception {
		String action = "$ID.text;";
		String expecting = "";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n"+
				"a : ID ID {"+action+"};" +
				"ID : 'a';\n");
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();

		int expectedMsgID = ErrorManager.MSG_NONUNIQUE_REF;
		Object expectedArg = "ID";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg);
		checkError(equeue, expectedMessage);
	}

	@Test public void testRuleRefWithDynamicScope() throws Exception {
		String action = "$field::x = $field.st;";
		String expecting = "field_stack.peek().x = retval.st;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar a;\n" +
				"field\n" +
				"scope { ST x; }\n" +
				"    :   'y' {"+action+"}\n" +
				"    ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,
			"field",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testAssignToOwnRulenameAttr() throws Exception {
		String action = "$rule.tree = null;";
		String expecting = "retval.tree = null;";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar a;\n" +
				"rule\n" +
				"    : 'y' {" + action +"}\n" +
				"    ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,
			"rule",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testAssignToOwnParamAttr() throws Exception {
		String action = "$rule.i = 42; $i = 23;";
		String expecting = "i = 42; i = 23;";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar a;\n" +
				"rule[int i]\n" +
				"    : 'y' {" + action +"}\n" +
				"    ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,
			"rule",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testIllegalAssignToOwnRulenameAttr() throws Exception {
		String action = "$rule.stop = 0;";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar a;\n" +
				"rule\n" +
				"    : 'y' {" + action +"}\n" +
				"    ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,
			"rule",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();

		int expectedMsgID = ErrorManager.MSG_WRITE_TO_READONLY_ATTR;
		Object expectedArg = "rule";
		Object expectedArg2 = "stop";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testIllegalAssignToLocalAttr() throws Exception {
		String action = "$tree = null; $st = null; $start = 0; $stop = 0; $text = 0;";
		String expecting = "retval.tree = null; retval.st = null;   ";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar a;\n" +
				"rule\n" +
				"    : 'y' {" + action +"}\n" +
				"    ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,
			"rule",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();

		int expectedMsgID = ErrorManager.MSG_WRITE_TO_READONLY_ATTR;
		ArrayList<Message> expectedErrors = new ArrayList<Message>(3);
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, "start", "");
		expectedErrors.add(expectedMessage);
		GrammarSemanticsMessage expectedMessage2 =
			new GrammarSemanticsMessage(expectedMsgID, g, null, "stop", "");
		expectedErrors.add(expectedMessage2);
		GrammarSemanticsMessage expectedMessage3 =
			new GrammarSemanticsMessage(expectedMsgID, g, null, "text", "");
		expectedErrors.add(expectedMessage3);
		checkErrors(equeue, expectedErrors);

		STGroup templates =
			new STGroup();
		ST actionST = new ST(templates, rawTranslation);
		String found = actionST.render();
		assertEquals(expecting, found);
	}

	@Test public void testIllegalAssignRuleRefAttr() throws Exception {
		String action = "$other.tree = null;";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar a;\n" +
				"options { output = AST;}" +
				"otherrule\n" +
				"    : 'y' ;" +
				"rule\n" +
				"    : other=otherrule {" + action +"}\n" +
				"    ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,
			"rule",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();

		int expectedMsgID = ErrorManager.MSG_WRITE_TO_READONLY_ATTR;
		Object expectedArg = "other";
		Object expectedArg2 = "tree";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testIllegalAssignTokenRefAttr() throws Exception {
		String action = "$ID.text = \"test\";";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar a;\n" +
				"ID\n" +
				"    : 'y' ;" +
				"rule\n" +
				"    : ID {" + action +"}\n" +
				"    ;");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator,
			"rule",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();

		int expectedMsgID = ErrorManager.MSG_WRITE_TO_READONLY_ATTR;
		Object expectedArg = "ID";
		Object expectedArg2 = "text";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		checkError(equeue, expectedMessage);
	}

	@Test public void testAssignToTreeNodeAttribute() throws Exception {
		String action = "$tree.scope = localScope;";
		String expecting = "retval.tree.scope = localScope;";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar a;\n" +
				"options { output=AST; }" +
				"rule\n" +
				"@init {\n" +
				"   Scope localScope=null;\n" +
				"}\n" +
				"@after {\n" +
				"   ###$tree.scope = localScope;!!!\n" +
				"}\n" +
				"   : 'a' -> ^('a')\n" +
				";");
		Tool antlr = newTool();

		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // codegen phase sets some vars we need
		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

	}

	@Test public void testDoNotTranslateAttributeCompare() throws Exception {
		String action = "$a.line == $b.line";
		String expecting = "(a!=null?a.getLine():0) == (b!=null?b.getLine():0)";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"lexer grammar a;\n" +
				"RULE:\n" +
				"     a=ID b=ID {" + action + "}" +
				"    ;\n" +
				"ID : 'id';"
		);
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();
		ActionTranslator translator = new ActionTranslator(generator,
			"RULE",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
		assertEquals(expecting, found);
	}

	@Test public void testDoNotTranslateScopeAttributeCompare() throws Exception {
		String action = "if ($rule::foo == \"foo\" || 1) { System.out.println(\"ouch\"); }";
		String expecting = "if (rule_stack.peek().foo == \"foo\" || 1) { System.out.println(\"ouch\"); }";
		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar a;\n" +
				"rule\n" +
				"scope {\n" +
				"   String foo;" +
				"} :\n" +
				"     twoIDs" +
				"    ;\n" +
				"twoIDs:\n" +
				"    ID ID {" + action + "}\n" +
				"    ;\n" +
				"ID : 'id';"
		);
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer();
		ActionTranslator translator = new ActionTranslator(generator,
			"twoIDs",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();
		// check that we didn't use scopeSetAttributeRef int translation!
		boolean foundScopeSetAttributeRef = false;
		for (int i = 0; i < translator.chunks.size(); i++) {
			Object chunk = translator.chunks.get(i);
			if (chunk instanceof ST) {
				if (((ST)chunk).getName().equals("/scopeSetAttributeRef")) {
					foundScopeSetAttributeRef = true;
				}
			}
		}
		assertFalse("action translator used scopeSetAttributeRef template in comparison!", foundScopeSetAttributeRef);
		STGroup templates =
			new STGroup();
		ST actionST = new ST(templates, rawTranslation);
		String found = actionST.render();
		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
		assertEquals(expecting, found);
	}

	@Test public void testTreeRuleStopAttributeIsInvalid() throws Exception {
		String action = "$r.x; $r.start; $r.stop";
		String expecting = "(r!=null?((t.a_return)r).x:0); (r!=null?((CommonTree)r.start):null); $r.stop";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"tree grammar t;\n" +
				"options {ASTLabelType=CommonTree;}\n"+
				"a returns [int x]\n" +
				"  :\n" +
				"  ;\n"+
				"b : r=a {###"+action+"!!!}\n" +
				"  ;");
		System.out.println(g.toString());
		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // codegen phase sets some vars we need
		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

		int expectedMsgID = ErrorManager.MSG_UNKNOWN_RULE_ATTRIBUTE;
		Object expectedArg = "a";
		Object expectedArg2 = "stop";
		GrammarSemanticsMessage expectedMessage =
			new GrammarSemanticsMessage(expectedMsgID, g, null, expectedArg, expectedArg2);
		System.out.println("equeue:"+equeue);
		checkError(equeue, expectedMessage);
	}

	@Test public void testRefToTextAttributeForCurrentTreeRule() throws Exception {
		String action = "$text";
		String expecting = "input.getTokenStream().toString(" +
			"input.getTreeAdaptor().getTokenStartIndex(retval.start)," +
			"input.getTreeAdaptor().getTokenStopIndex(retval.start))";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"tree grammar t;\n" +
				"options {ASTLabelType=CommonTree;}\n" +
				"a : {###"+action+"!!!}\n" +
				"  ;\n");

		Tool antlr = newTool();
		antlr.setOutputDirectory(null); // write to /dev/null
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // codegen phase sets some vars we need
		ST codeST = generator.getRecognizerST();
		String code = codeST.render();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	@Test public void testTypeOfGuardedAttributeRefIsCorrect() throws Exception {
		String action = "int x = $b::n;";
		String expecting = "int x = b_stack.peek().n;";

		ErrorQueue equeue = new ErrorQueue();
		ErrorManager.setErrorListener(equeue);
		Grammar g = new Grammar(
			"grammar t;\n" +
				"s : b ;\n"+
				"b\n" +
				"scope {\n" +
				"  int n;\n" +
				"} : '(' b ')' {"+action+"}\n" + // refers to current invocation's n
				"  ;\n");
		Tool antlr = newTool();
		CodeGenerator generator = new CodeGenerator(antlr, g, "Java");
		g.setCodeGenerator(generator);
		generator.genRecognizer(); // forces load of templates
		ActionTranslator translator = new ActionTranslator(generator, "b",
			new CommonToken(ANTLRParser.ACTION,action),1);
		String found = translator.translate();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}

	// S U P P O R T

	protected void checkError(ErrorQueue equeue,
							  GrammarSemanticsMessage expectedMessage)
		throws Exception
	{
		/*
		System.out.println(equeue.infos);
		System.out.println(equeue.warnings);
		System.out.println(equeue.errors);
		*/
		Message foundMsg = null;
		for (int i = 0; i < equeue.errors.size(); i++) {
			Message m = equeue.errors.get(i);
			if (m.msgID==expectedMessage.msgID ) {
				foundMsg = m;
			}
		}
		assertTrue("no error; "+expectedMessage.msgID+" expected", equeue.errors.size() > 0);
		assertNotNull("couldn't find expected error: "+expectedMessage.msgID+" in "+equeue, foundMsg);
		assertTrue("error is not a GrammarSemanticsMessage",
			foundMsg instanceof GrammarSemanticsMessage);
		assertEquals(expectedMessage.arg, foundMsg.arg);
		assertEquals(expectedMessage.arg2, foundMsg.arg2);
	}

	/** Allow checking for multiple errors in one test */
	protected void checkErrors(ErrorQueue equeue,
							   ArrayList<Message> expectedMessages)
		throws Exception
	{
		ArrayList<Boolean> messageExpected = new ArrayList<Boolean>(equeue.errors.size());
		for (int i = 0; i < equeue.errors.size(); i++) {
			Message m = equeue.errors.get(i);
			boolean foundMsg = false;
			for (int j = 0; j < expectedMessages.size(); j++) {
				Message em = expectedMessages.get(j);
				if (m.msgID==em.msgID && m.arg.equals(em.arg) && m.arg2.equals(em.arg2)) {
					foundMsg = true;
				}
			}
			if (foundMsg) {
				messageExpected.add(i, Boolean.TRUE);
			} else
				messageExpected.add(i, Boolean.FALSE);
		}
		for (int i = 0; i < equeue.errors.size(); i++) {
			assertTrue("unexpected error:" + equeue.errors.get(i), messageExpected.get(i));
		}
	}
}