| /* |
| * 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 ] ); |
| } |
| |
| } |