antlr-3.4/tool/src/test/java/org/antlr/test/TestJavaCodeGeneration.java

/*
 * [The "BSD license"]
 *  Copyright (c) 2010 Terence Parr
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 *      derived from this software without specific prior written permission.
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package org.antlr.test;

import org.junit.Test;

/** General code generation testing; compilation and/or execution.
 *  These tests are more about avoiding duplicate var definitions
 *  etc... than testing a particular ANTLR feature.
 */
public class TestJavaCodeGeneration extends BaseTest {
	@Test public void testDupVarDefForPinchedState() {
		// so->s2 and s0->s3->s1 pinches back to s1
		// LA3_1, s1 state for DFA 3, was defined twice in similar scope
		// just wrapped in curlies and it's cool.
		String grammar =
			"grammar T;\n" +
			"a : (| A | B) X Y\n" +
			"  | (| A | B) X Z\n" +
			"  ;\n" ;
		boolean found =
			rawGenerateAndBuildRecognizer(
				"T.g", grammar, "TParser", null, false);
		boolean expecting = true; // should be ok
		assertEquals(expecting, found);
	}

	@Test public void testLabeledNotSetsInLexer() {
		// d must be an int
		String grammar =
			"lexer grammar T;\n" +
			"A : d=~('x'|'y') e='0'..'9'\n" +
			"  ; \n" ;
		boolean found =
			rawGenerateAndBuildRecognizer(
				"T.g", grammar, null, "T", false);
		boolean expecting = true; // should be ok
		assertEquals(expecting, found);
	}

	@Test public void testLabeledSetsInLexer() {
		// d must be an int
		String grammar =
			"grammar T;\n" +
			"a : A ;\n" +
			"A : d=('x'|'y') {System.out.println((char)$d);}\n" +
			"  ; \n" ;
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "x", false);
		assertEquals("x\n", found);
	}

	@Test public void testLabeledRangeInLexer() {
		// d must be an int
		String grammar =
			"grammar T;\n" +
			"a : A;\n" +
			"A : d='a'..'z' {System.out.println((char)$d);} \n" +
			"  ; \n" ;
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "x", false);
		assertEquals("x\n", found);
	}

	@Test public void testLabeledWildcardInLexer() {
		// d must be an int
		String grammar =
			"grammar T;\n" +
			"a : A;\n" +
			"A : d=. {System.out.println((char)$d);}\n" +
			"  ; \n" ;
		String found = execParser("T.g", grammar, "TParser", "TLexer",
								  "a", "x", false);
		assertEquals("x\n", found);
	}

	@Test public void testSynpredWithPlusLoop() {
		String grammar =
			"grammar T; \n" +
			"a : (('x'+)=> 'x'+)?;\n";
		boolean found =
			rawGenerateAndBuildRecognizer(
				"T.g", grammar, "TParser", "TLexer", false);
		boolean expecting = true; // should be ok
		assertEquals(expecting, found);
	}

	@Test public void testDoubleQuoteEscape() {
		String grammar =
			"lexer grammar T; \n" +
			"A : '\\\\\"';\n" +          // this is A : '\\"', which should give "\\\"" at Java level;
            "B : '\\\"';\n" +            // this is B: '\"', which shodl give "\"" at Java level;
            "C : '\\'\\'';\n" +          // this is C: '\'\'', which shoudl give "''" at Java level
            "D : '\\k';\n";              // this is D: '\k', which shoudl give just "k" at Java level;

		boolean found =
			rawGenerateAndBuildRecognizer(
				"T.g", grammar, null, "T", false);
		boolean expecting = true; // should be ok
		assertEquals(expecting, found);
	}

	@Test public void testBlankRuleGetsNoException() {
		String grammar =
			"grammar T;\n" +
			"a : sync (ID sync)* ;\n" +
			"sync : ;\n" +
			"ID : 'a'..'z'+;\n";
		boolean found =
			rawGenerateAndBuildRecognizer(
				"T.g", grammar, "TParser", "TLexer", false);
		boolean expecting = true; // should be ok
		assertEquals(expecting, found);
	}
}