testautoast.java

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

	}

	public void testTailRecursion() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"s : a ;\n" +
			"a : atom ('exp'^^ a)? ;\n" +
			"atom : INT ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "s", "3 exp 4 exp 5", debug);
		assertEquals("(exp 3 (exp 4 5))\n", found);
	}

	public void testSet() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : ID|INT ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "abc", debug);
		assertEquals("abc\n", found);
	}

	public void testSetRoot() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : ('+' | '-')^ ID ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "+abc", debug);
		assertEquals("(+ abc)\n", found);
	}

	public void testSetAsRuleRootInLoop() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : ID (('+'|'-')^^ ID)* ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a+b-c", debug);
		assertEquals("(- (+ a b) c)\n", found);
	}

	public void testNotSet() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : ~ID '+' INT ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "34+2", debug);
		assertEquals("34 + 2\n", found);
	}

	public void testNotSetRoot() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : ~'+'^ INT ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "34 55", debug);
		assertEquals("(34 55)\n", found);
	}

	public void testNotSetRuleRootInLoop() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : INT (~INT^^ INT)* ;\n" +
			"blort : '+' ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "3+4+5", debug);
		assertEquals("(+ (+ 3 4) 5)\n", found);
	}

	public void testTokenLabelReuse() throws Exception {
		// check for compilation problem due to multiple defines
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : id=ID id=ID {System.out.print(\"2nd id=\"+$id.text+';');} ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a b", debug);
		assertEquals("2nd id=b;a b\n", found);
	}

	public void testTokenLabelReuse2() throws Exception {
		// check for compilation problem due to multiple defines
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : id=ID id=ID^ {System.out.print(\"2nd id=\"+$id.text+';');} ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a b", debug);
		assertEquals("2nd id=b;(b a)\n", found);
	}

	public void testTokenListLabelReuse() throws Exception {
		// check for compilation problem due to multiple defines
		// make sure ids has both ID tokens
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : ids+=ID ids+=ID {System.out.print(\"id list=\"+$ids+';');} ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a b", debug);
		String expecting = "id list=[[@0,0:0='a',<4>,1:0], [@2,2:2='b',<4>,1:2]];a b\n";
		assertEquals(expecting, found);
	}

	public void testTokenListLabelReuse2() throws Exception {
		// check for compilation problem due to multiple defines
		// make sure ids has both ID tokens
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : ids+=ID^ ids+=ID {System.out.print(\"id list=\"+$ids+';');} ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a b", debug);
		String expecting = "id list=[[@0,0:0='a',<4>,1:0], [@2,2:2='b',<4>,1:2]];(a b)\n";
		assertEquals(expecting, found);
	}

	public void testTokenListLabelRuleRoot() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : id+=ID^^ ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a", debug);
		assertEquals("a\n", found);
	}

	public void testTokenListLabelBang() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : id+=ID! ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a", debug);
		assertEquals("nil\n", found);
	}

	public void testRuleListLabel() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : x+=b x+=b {" +
				"b_return ret=(b_return)$x.get(1);" +
				"System.out.print(\"2nd x=\"+((CommonTree)ret.tree).toStringTree()+';');} ;\n" +
			"b : ID;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a b", debug);
		assertEquals("2nd x=b;a b\n", found);
	}

	public void testRuleListLabelRoot() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : ( x+=b^ )+ {" +
			"b_return ret=(b_return)$x.get(1);" +
			"System.out.print(\"x=\"+((CommonTree)ret.tree).toStringTree()+';');} ;\n" +
			"b : ID;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a b", debug);
		assertEquals("x=b;a b\n", found);
	}

	public void testRuleListLabelRuleRoot() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : ( x+=b^^ )+ {" +
			"b_return ret=(b_return)$x.get(1);" +
			"System.out.print(\"x=\"+((CommonTree)ret.tree).toStringTree()+';');} ;\n" +
			"b : ID;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a b", debug);
		assertEquals("x=(b a);(b a)\n", found);
	}

	public void testRuleListLabelBang() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : x+=b! x+=b {" +
			"b_return ret=(b_return)$x.get(0);" +
			"System.out.print(\"1st x=\"+((CommonTree)ret.tree).toStringTree()+';');} ;\n" +
			"b : ID;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a b", debug);
		assertEquals("1st x=a;b\n", found);
	}

	public void testComplicatedMelange() throws Exception {
		// check for compilation problem
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a : A b=B b=B c+=C c+=C D {$D.text;} ;\n" +
			"A : 'a' ;\n" +
			"B : 'b' ;\n" +
			"C : 'c' ;\n" +
			"D : 'd' ;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "a b b c c d", debug);
		assertEquals("a b b c c d\n", found);
	}

	public void testReturnValueWithAST() throws Exception {
		String grammar =
			"grammar foo;\n" +
			"options {output=AST;}\n" +
			"a : ID b {System.out.println($b.i);} ;\n" +
			"b returns [int i] : INT {$i=Integer.parseInt($INT.text);} ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("foo.g", grammar, "fooParser", "fooLexer",
								  "a", "abc 34", debug);
		assertEquals("34\nabc 34\n", found);
	}


	// S U P P O R T

	public void _test() throws Exception {
		String grammar =
			"grammar T;\n" +
			"options {output=AST;}\n" +
			"a :  ;\n" +
			"ID : 'a'..'z'+ ;\n" +
			"INT : '0'..'9'+;\n" +
			"WS : (' '|'\\n') {$channel=HIDDEN;} ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer", "a", "abc 34", debug);
		assertEquals("\n", found);
	}

}