io.trino.grammar.sql.SqlKeywords Maven / Gradle / Ivy
/*
* 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 io.trino.grammar.sql;
import com.google.common.collect.ImmutableSet;
import org.antlr.v4.runtime.Vocabulary;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static com.google.common.base.Strings.nullToEmpty;
public final class SqlKeywords
{
private static final Pattern IDENTIFIER = Pattern.compile("'([A-Z_]+)'");
private SqlKeywords() {}
public static Set sqlKeywords()
{
ImmutableSet.Builder names = ImmutableSet.builder();
Vocabulary vocabulary = SqlBaseLexer.VOCABULARY;
for (int i = 0; i <= vocabulary.getMaxTokenType(); i++) {
String name = nullToEmpty(vocabulary.getLiteralName(i));
Matcher matcher = IDENTIFIER.matcher(name);
if (matcher.matches()) {
names.add(matcher.group(1));
}
}
return names.build();
}
}