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Add regression test for issue #509

This commit is contained in:
Sam Harwell 2014-03-23 11:30:06 -05:00
parent c6e6ccde4c
commit cb0119e761
1 changed files with 19 additions and 0 deletions
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19
tool/test/org/antlr/v4/test/TestLeftRecursion.java
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@ -497,6 +497,25 @@ public class TestLeftRecursion extends BaseTest {
assertNull(stderrDuringParse);
}
/**
* This is a regression test for antlr/antlr4#509 "Incorrect rule chosen in
* unambiguous grammar".
* https://github.com/antlr/antlr4/issues/509
*/
@Test public void testPrecedenceFilterConsidersContext() throws Exception {
String grammar =
"grammar T;\n" +
"prog\n" +
"@after {System.out.println($ctx.toStringTree(this));}\n" +
": statement* EOF {};\n" +
"statement: letterA | statement letterA 'b' ;\n" +
"letterA: 'a';\n";
String found = execParser("T.g4", grammar, "TParser", "TLexer", "prog",
"aa", false);
assertEquals("(prog (statement (letterA a)) (statement (letterA a)) <EOF>)\n", found);
}
public void runTests(String grammar, String[] tests, String startRule) {
rawGenerateAndBuildRecognizer("T.g4", grammar, "TParser", "TLexer");
writeRecognizerAndCompile("TParser",