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add test for hidden tokens

This commit is contained in:
Terence Parr 2013-11-21 09:55:26 -08:00
parent 4a46e1a679
commit e836544d30
1 changed files with 21 additions and 0 deletions
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21
tool/test/org/antlr/v4/test/TestParseTreeMatcher.java
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@ -115,6 +115,27 @@ public class TestParseTreeMatcher extends BaseTest {
assertEquals(expected, results);
}
@Test
public void testHiddenTokensNotSeenByTreePatternParser() throws Exception {
String grammar =
"grammar X2;\n" +
"s : ID '=' expr ';' ;\n" +
"expr : ID | INT ;\n" +
"ID : [a-z]+ ;\n" +
"INT : [0-9]+ ;\n" +
"WS : [ \\r\\n\\t]+ -> channel(HIDDEN) ;\n";
boolean ok =
rawGenerateAndBuildRecognizer("X2.g4", grammar, "X2Parser", "X2Lexer", false);
assertTrue(ok);
ParseTreePatternMatcher p = getMatcher("X2");
ParseTreePattern t = p.compile("s", "<ID> = <expr> ;");
String results = t.patternTree.toStringTree(p.getParser());
String expected = "(s <ID> = (expr <expr>) ;)";
assertEquals(expected, results);
}
@Test
public void testCompilingMultipleTokens() throws Exception {
String grammar =