1 /* 2 * Copyright 2017 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SKSL_DFASTATE 9 #define SKSL_DFASTATE 10 11 #include "LexUtil.h" 12 13 struct DFAState { 14 struct Label { 15 std::vector<int> fStates; 16 17 Label(std::vector<int> states) 18 : fStates(std::move(states)) {} 19 20 bool operator==(const Label& other) const { 21 return fStates == other.fStates; 22 } 23 24 bool operator!=(const Label& other) const { 25 return !(*this == other); 26 } 27 28 std::string description() const { 29 std::string result = "<"; 30 const char* separator = ""; 31 for (int s : fStates) { 32 result += separator; 33 result += std::to_string(s); 34 separator = ", "; 35 } 36 result += ">"; 37 return result; 38 } 39 }; 40 41 DFAState() 42 : fId(INVALID) 43 , fLabel({}) {} 44 45 DFAState(int id, Label label) 46 : fId(id) 47 , fLabel(std::move(label)) {} 48 49 DFAState(const DFAState& other) = delete; 50 51 int fId; 52 53 Label fLabel; 54 55 bool fIsScanned = false; 56 }; 57 58 namespace std { 59 template<> struct hash<DFAState::Label> { 60 size_t operator()(const DFAState::Label& s) const { 61 int result = 0; 62 for (int i : s.fStates) { 63 result = result * 101 + i; 64 } 65 return result; 66 } 67 }; 68 } // namespace 69 70 #endif 71
