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Add regression test for issue #461 (interpreter starting with LR rule)

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Sam Harwell 2014-02-06 20:46:32 -06:00
parent 9d9e718692
commit d498292680
1 changed files with 29 additions and 0 deletions
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29
tool/test/org/antlr/v4/test/TestParserInterpreter.java
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@ -192,6 +192,35 @@ public class TestParserInterpreter extends BaseTest {
testInterp(lg, g, "s", "a+a*a", "(s (e (e a) + (e (e a) * (e a))))"); testInterp(lg, g, "s", "a+a*a", "(s (e (e a) + (e (e a) * (e a))))");
} }
/**
* This is a regression test for antlr/antlr4#461.
* https://github.com/antlr/antlr4/issues/461
*/
@Test public void testLeftRecursiveStartRule() throws Exception {
LexerGrammar lg = new LexerGrammar(
"lexer grammar L;\n" +
"A : 'a' ;\n" +
"B : 'b' ;\n" +
"C : 'c' ;\n" +
"PLUS : '+' ;\n" +
"MULT : '*' ;\n");
Grammar g = new Grammar(
"parser grammar T;\n" +
"s : e ;\n" +
"e : e MULT e\n" +
" | e PLUS e\n" +
" | A\n" +
" ;\n",
lg);
testInterp(lg, g, "e", "a", "(e a)");
testInterp(lg, g, "e", "a+a", "(e (e a) + (e a))");
testInterp(lg, g, "e", "a*a", "(e (e a) * (e a))");
testInterp(lg, g, "e", "a+a+a", "(e (e (e a) + (e a)) + (e a))");
testInterp(lg, g, "e", "a*a+a", "(e (e (e a) * (e a)) + (e a))");
testInterp(lg, g, "e", "a+a*a", "(e (e a) + (e (e a) * (e a)))");
}
void testInterp(LexerGrammar lg, Grammar g, void testInterp(LexerGrammar lg, Grammar g,
String startRule, String input, String startRule, String input,
String parseTree) String parseTree)