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Merge commit 'bbff5bd'

This commit is contained in:
Terence Parr 2012-03-12 13:26:24 -07:00
parent 79f204ff94 bbff5bd20a
commit 2d76dd8193
1 changed files with 51 additions and 0 deletions
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51
tool/test/org/antlr/v4/test/TestParserExec.java
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@ -162,4 +162,55 @@ public class TestParserExec extends BaseTest {
assertEquals("a34c\n", found);
}
/**
* This test is meant to detect regressions of bug antlr/antlr4#41.
* https://github.com/antlr/antlr4/issues/41
*/
@Test
public void testOptional() throws Exception {
String grammar =
"grammar T;\n" +
"s : a | 'x';\n" +
"a : 'a' s ('b' s)?;\n"
;
String found = execParser("T.g", grammar, "TParser", "TLexer", "s", "x", false);
assertEquals("", found);
assertNull(this.stderrDuringParse);
found = execParser("T.g", grammar, "TParser", "TLexer", "s", "axbx", false);
assertEquals("", found);
assertNull(this.stderrDuringParse);
found = execParser("T.g", grammar, "TParser", "TLexer", "s", "ax", false);
assertEquals("", found);
assertNull(this.stderrDuringParse);
found = execParser("T.g", grammar, "TParser", "TLexer", "s", "aaxbx", false);
assertEquals("", found);
assertNull(this.stderrDuringParse);
}
/**
* This test is meant to test the expected solution to antlr/antlr4#42.
* https://github.com/antlr/antlr4/issues/42
*/
@Test
public void testIfIfElse() throws Exception {
String grammar =
"grammar T;\n" +
"stmt : ifStmt | ID;\n" +
"ifStmt : 'if' ID stmt ('else' stmt | {_input.LA(1) != ELSE}?);\n" +
"ELSE : 'else';\n" +
"ID : [a-zA-Z]+;\n" +
"WS : (' ' | '\\t')+ -> skip;\n"
;
String found = execParser("T.g", grammar, "TParser", "TLexer", "stmt",
"if x if x a else b", true);
String expecting = "";
assertEquals(expecting, found);
assertNull(this.stderrDuringParse);
}
}