1 /* 2 * Copyright (C) 2025 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 #pragma once 18 #include <string> 19 #include <string_view> 20 21 struct Parser { ParserParser22 Parser(std::string_view str) 23 : mImmutableBegin(str.data()) 24 , mBegin(str.data()) 25 , mEnd(str.data() + str.size()) {} 26 matchSoFarParser27 bool matchSoFar() const { return mBegin != nullptr; } fullMatchParser28 bool fullMatch() const { return matchSoFar() && (mBegin == mEnd); } hasMoreParser29 bool hasMore() const { return matchSoFar() && (mBegin != mEnd); } frontParser30 char front() const { return hasMore() ? *mBegin : char(-1); } 31 32 Parser& skip(char c); 33 Parser& skip(const char* s); 34 Parser& operator()(char* result); 35 Parser& operator()(int* result, int base = 10); 36 Parser& operator()(std::string_view* result, char end); 37 Parser& operator()(std::string* result, char end); 38 39 std::string_view remaining(); 40 std::string remainingAsString(); 41 int consumed() const; 42 43 private: 44 const char* const mImmutableBegin; 45 const char* mBegin; 46 const char* mEnd; 47 }; 48