forgetest1
/
antlr
forked from jasder/antlr
1
0
Fork 0
Code Issues Pull Requests 1 Releases Wiki Activity

Add regression test for antlr/antlr4#26 (an exception upon simple rule with double recursion in an alternative)

This commit is contained in:
Sam Harwell 2012-10-25 21:45:03 -05:00
parent 5a5f56e91c
commit 8494007025
1 changed files with 43 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
tool/test/org/antlr/v4/test/TestParseErrors.java
View File

@ -296,6 +296,49 @@ public class TestParseErrors extends BaseTest {
assertNull(this.stderrDuringParse);
}
/**
* This is a regression test for #26 "an exception upon simple rule with double recursion in an alternative".
* https://github.com/antlr/antlr4/issues/26
*/
@Test
public void testDuplicatedLeftRecursiveCall() throws Exception {
String grammar =
"grammar T;\n" +
"start : expr EOF;\n" +
"expr : 'x'\n" +
" | expr expr\n" +
" ;\n" +
"\n";
String result = execParser("T.g4", grammar, "TParser", "TLexer", "start", "x", true);
assertEquals("", result);
assertNull(this.stderrDuringParse);
result = execParser("T.g4", grammar, "TParser", "TLexer", "start", "xx", true);
assertEquals("", result);
assertEquals(
"line 1:1 reportAttemptingFullContext d=0, input='x'\n" +
"line 1:1 reportContextSensitivity d=0, input='x'\n",
this.stderrDuringParse);
result = execParser("T.g4", grammar, "TParser", "TLexer", "start", "xxx", true);
assertEquals("", result);
assertEquals(
"line 1:1 reportAttemptingFullContext d=0, input='x'\n" +
"line 1:1 reportContextSensitivity d=0, input='x'\n" +
"line 1:2 reportAttemptingFullContext d=0, input='x'\n",
this.stderrDuringParse);
result = execParser("T.g4", grammar, "TParser", "TLexer", "start", "xxxx", true);
assertEquals("", result);
assertEquals(
"line 1:1 reportAttemptingFullContext d=0, input='x'\n" +
"line 1:1 reportContextSensitivity d=0, input='x'\n" +
"line 1:2 reportAttemptingFullContext d=0, input='x'\n" +
"line 1:3 reportAttemptingFullContext d=0, input='x'\n",
this.stderrDuringParse);
}
/**
* This is a regression test for #45 "NullPointerException in ATNConfig.hashCode".
* https://github.com/antlr/antlr4/issues/45