/*
* Copyright 2010 NCHOVY
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.krakenapps.bnf;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
import static org.krakenapps.bnf.Syntax.*;
import static org.junit.Assert.*;
public class ColumnListParserTest {
@SuppressWarnings("unchecked")
@Test
public void test() {
try {
Syntax s = new Syntax();
s.add("column_name_list", new ColumnNameListParser(), t("("), option(ref("column_name"), repeat(rule(
t(","), ref("column_name")))), t(")"));
s.add("column_name", null, idvar());
s.addRoot("column_name_list");
// general case
Object ret = s.eval("(a, b, c, d)");
assertNotNull(ret);
List<String> names = (List<String>) ret;
assertEquals("a", names.get(0));
assertEquals("b", names.get(1));
assertEquals("c", names.get(2));
assertEquals("d", names.get(3));
// empty test
names = (List<String>) s.eval("()");
assertEquals(0, names.size());
// one element test
names = (List<String>) s.eval("(a)");
assertEquals(1, names.size());
assertEquals("a", names.get(0));
// invalid syntax
try {
s.eval("(a,)");
assertTrue(false);
} catch (Exception e) {
}
} catch (Exception e) {
assertFalse(true);
}
}
private static class ColumnNameListParser implements Parser {
@Override
public Object parse(Binding b) {
List<String> names = new ArrayList<String>();
ParserUtil.buildList(b, names);
return names;
}
}
}