1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package parser 18 19 import lexer.Token 20 21 /** 22 * Returns the next token in the iteration, without advancing the iteration. 23 */ peekTokennull24fun peekToken(iter: ListIterator<Token>): Token? { 25 if (iter.hasNext()) { 26 val token = iter.next() 27 iter.previous() 28 return token 29 } else { 30 return null 31 } 32 } 33 peekPreviousTokennull34fun peekPreviousToken(iter: ListIterator<Token>): Token? { 35 if (iter.hasPrevious()) { 36 val token = iter.previous() 37 iter.next() 38 return token 39 } else { 40 return null 41 } 42 }