org.apache.pig.parser.QueryParserStreamUtil Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.pig.parser;
import org.antlr.runtime.CharStream;
public class QueryParserStreamUtil {
/**
* Refer to ANTLRStringStream class for definitions of n, p, and data.
* @param i look ahead number
*/
public static int LA(int i, int n, int p, char[] data) {
if( i == 0 ) {
return 0; // undefined
}
if ( i < 0 ) {
i++; // e.g., translate LA(-1) to use offset 0
}
if( p + i - 1 >= n ) {
return CharStream.EOF;
}
return Character.toUpperCase( data[ p + i - 1 ] );
}
}