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// Copyright 2021 The Tint Authors.
// 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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include <random>
#include <string>
#include <utility>
#include <vector>
namespace tint {
namespace fuzzers {
namespace regex_fuzzer {
/// A function that given a delimiter, returns a vector that contains
/// all the positions of the delimiter in the WGSL code.
/// @param delimiter - the delimiter of the enclosed region.
/// @param wgsl_code - the initial string (WGSL code) that will be mutated.
/// @return a vector with the positions of the delimiter in the WGSL code.
std::vector<size_t> FindDelimiterIndices(const std::string& delimiter,
const std::string& wgsl_code);
/// Given 4 indices, idx1, idx2, idx3 and idx4 it swaps the regions
/// in the interval [idx1, idx2] with the region in the interval [idx3, idx4]
/// in wgsl_text.
/// @param idx1 - starting index of the first region.
/// @param idx2 - terminating index of the second region.
/// @param idx3 - starting index of the second region.
/// @param idx4 - terminating index of the second region.
/// @param wgsl_code - the string where the swap will occur.
void SwapIntervals(size_t idx1,
size_t idx2,
size_t idx3,
size_t idx4,
std::string* wgsl_code);
/// A function that, given an initial string (valid WGSL code) and a delimiter,
/// generates a new set of strings (valid or invalid WGSL code) by
/// picking two random regions and swapping them.
/// @param wgsl_code - the initial string (WGSL code) that will be mutated.
/// @param size - size of the string that will be mutated.
/// @param max_size - maximal allowed mutation size.
/// @param delimiter - the delimiter that will be used to find enclosed regions.
/// @param generator - the random number generator.
/// @return size of the mutated string.
size_t FuzzEnclosedRegions(size_t size,
size_t max_size,
const std::string& delimiter,
uint8_t* wgsl_code,
std::mt19937* generator);
} // namespace regex_fuzzer
} // namespace fuzzers
} // namespace tint