testattributes.java

ANTLR(ANother Tool for Language Recognition)它是这样的一种工具

		String found = actionST.toString();
		assertEquals(expecting, found);

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

	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
		ActionTranslatorLexer translator = new ActionTranslatorLexer(generator,"a",
																	 new antlr.CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();
		StringTemplateGroup templates =
			new StringTemplateGroup(".", AngleBracketTemplateLexer.class);
		StringTemplate actionST = new StringTemplate(templates, rawTranslation);
		String found = actionST.toString();
		assertEquals(expecting, found);

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

	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
		ActionTranslatorLexer translator = new ActionTranslatorLexer(generator,"a",
																	 new antlr.CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();
		StringTemplateGroup templates =
			new StringTemplateGroup(".", AngleBracketTemplateLexer.class);
		StringTemplate actionST = new StringTemplate(templates, rawTranslation);
		String found = actionST.toString();
		assertEquals(expecting, found);

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

	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
		ActionTranslatorLexer translator = new ActionTranslatorLexer(generator,"a",
																	 new antlr.CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();
		StringTemplateGroup templates =
			new StringTemplateGroup(".", AngleBracketTemplateLexer.class);
		StringTemplate actionST = new StringTemplate(templates, rawTranslation);
		String found = actionST.toString();
		assertEquals(expecting, found);

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

	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);
	}

	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 $a.x makes no sense.
	public void testFullyQualifiedRefToLabelInCurrentRule() throws Exception {
			String action = "$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
			ActionTranslatorLexer translator = new ActionTranslatorLexer(generator,"a",
															   new antlr.CommonToken(ANTLRParser.ACTION,action),1);
			String rawTranslation =
				translator.translate();
			StringTemplateGroup templates =
				new StringTemplateGroup(".", AngleBracketTemplateLexer.class);
			StringTemplate actionST = new StringTemplate(templates, rawTranslation);
			String found = actionST.toString();
			assertEquals(expecting, found);

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

	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
		ActionTranslatorLexer translator = new ActionTranslatorLexer(generator,"a",
														   new antlr.CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();
		StringTemplateGroup templates =
			new StringTemplateGroup(".", AngleBracketTemplateLexer.class);
		StringTemplate actionST = new StringTemplate(templates, rawTranslation);
		String found = actionST.toString();
		assertEquals(expecting, found);

		assertEquals("unexpected errors: "+equeue, 0, equeue.errors.size());
	}
*/
	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
		ActionTranslatorLexer translator = new ActionTranslatorLexer(generator,"a",
																	 new antlr.CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();
		StringTemplateGroup templates =
			new StringTemplateGroup(".", AngleBracketTemplateLexer.class);
		StringTemplate actionST = new StringTemplate(templates, rawTranslation);
		String found = actionST.toString();
		assertEquals(expecting, found);

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

	public void testRuleRefWhenRuleHasScope() throws Exception {
		String action = "$b.start;";
		String expecting = "((Token)b1.start);";

		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

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

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

	public void testDynamicScopeRefOkEvenThoughRuleRefExists() throws Exception {
		String action = "$b::n;";
		String expecting = "((b_scope)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
		ActionTranslatorLexer translator = new ActionTranslatorLexer(generator, "b",
																	 new antlr.CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();
		StringTemplateGroup templates =
			new StringTemplateGroup(".", AngleBracketTemplateLexer.class);
		StringTemplate actionST = new StringTemplate(templates, rawTranslation);
		String found = actionST.toString();
		assertEquals(expecting, found);

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

	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
		ActionTranslatorLexer translator = new ActionTranslatorLexer(generator,"a",
																	 new antlr.CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();
		StringTemplateGroup templates =
			new StringTemplateGroup(".", AngleBracketTemplateLexer.class);
		StringTemplate actionST = new StringTemplate(templates, rawTranslation);
		String found = actionST.toString();
		assertEquals(expecting, found);

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

	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(); // forces load of templates
		ActionTranslatorLexer translator = new ActionTranslatorLexer(generator,"a",
																	 new antlr.CommonToken(ANTLRParser.ACTION,action),1);
		String rawTranslation =
			translator.translate();
		StringTemplateGroup templates =
			new StringTemplateGroup(".", AngleBracketTemplateLexer.class);
		StringTemplate actionST = new StringTemplate(templates, rawTranslation);
		String found = actionST.toString();
		assertEquals(expecting, found);

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

	public void testRefToStartAttributeForCurrentRule() throws Exception {
		String action = "$start;";
		String expecting = "((Token)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
		ActionTranslatorLexer translator = new ActionTranslatorLexer(generator,"a",
																	 new antlr.CommonToken(ANTLRParser.ACTION,action),1);
		StringTemplate codeST = generator.getRecognizerST();
		String code = codeST.toString();
		String found = code.substring(code.indexOf("###")+3,code.indexOf("!!!"));
		assertEquals(expecting, found);

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

	public void testTokenLabelFromMultipleAlts() throws Exception {
		String action = "$ID.text;"; // must be qualified
		String action2 = "$INT.text;"; // must be qualified