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

/*
 * [The "BSD license"]
 * Copyright (c) 2011 Terence Parr
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package org.antlr.test;

import org.junit.Test;

/** test runtime parse errors */
public class TestSyntaxErrors extends BaseTest {
	@Test public void testLL2() throws Exception {
		String grammar =
			"grammar T;\n" +
			"a : 'a' 'b'" +
			"  | 'a' 'c'" +
			";\n" +
			"q : 'e' ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer", "a", "ae", false);
		String expecting = "line 1:1 no viable alternative at input 'e'\n";
		String result = stderrDuringParse;
		assertEquals(expecting, result);
	}

	@Test public void testLL3() throws Exception {
		String grammar =
			"grammar T;\n" +
			"a : 'a' 'b'* 'c'" +
			"  | 'a' 'b' 'd'" +
			"  ;\n" +
			"q : 'e' ;\n";
		System.out.println(grammar);
		String found = execParser("T.g", grammar, "TParser", "TLexer", "a", "abe", false);
		String expecting = "line 1:2 no viable alternative at input 'e'\n";
		String result = stderrDuringParse;
		assertEquals(expecting, result);
	}

	@Test public void testLLStar() throws Exception {
		String grammar =
			"grammar T;\n" +
			"a : 'a'+ 'b'" +
			"  | 'a'+ 'c'" +
			";\n" +
			"q : 'e' ;\n";
		String found = execParser("T.g", grammar, "TParser", "TLexer", "a", "aaae", false);
		String expecting = "line 1:3 no viable alternative at input 'e'\n";
		String result = stderrDuringParse;
		assertEquals(expecting, result);
	}

	@Test public void testSynPred() throws Exception {
		String grammar =
			"grammar T;\n" +
			"a : (e '.')=> e '.'" +
			"  | (e ';')=> e ';'" +
			"  | 'z'" +
			"  ;\n" +
			"e : '(' e ')'" +
			"  | 'i'" +
			"  ;\n";
		System.out.println(grammar);
		String found = execParser("T.g", grammar, "TParser", "TLexer", "a", "((i))z", false);
		String expecting = "line 1:0 no viable alternative at input '('\n";
		String result = stderrDuringParse;
		assertEquals(expecting, result);
	}

	@Test public void testLL1ErrorInfo() throws Exception {
		String grammar =
			"grammar T;\n" +
			"start : animal (AND acClass)? service EOF;\n" +
			"animal : (DOG | CAT );\n" +
			"service : (HARDWARE | SOFTWARE) ;\n" +
			"AND : 'and';\n" +
			"DOG : 'dog';\n" +
			"CAT : 'cat';\n" +
			"HARDWARE: 'hardware';\n" +
			"SOFTWARE: 'software';\n" +
			"WS : ' ' {skip();} ;" +
			"acClass\n" +
			"@init\n" +
			"{ System.out.println(computeContextSensitiveRuleFOLLOW().toString(tokenNames)); }\n" +
			"  : ;\n";
		String result = execParser("T.g", grammar, "TParser", "TLexer", "start", "dog and software", false);
		String expecting = "{HARDWARE,SOFTWARE}\n";
		assertEquals(expecting, result);
	}
}