101 lines
2.4 KiB
C++
101 lines
2.4 KiB
C++
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#pragma once
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#include "Strings.hpp"
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#include "Automata.hpp"
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#include "Buffer2D.hpp"
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namespace tp {
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template <typename tAlphabetType, typename tStateType>
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class RegularAutomata {
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public:
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struct AcceptResult {
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bool accepted = false;
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ualni advancedIdx = 0;
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tStateType state = tStateType();
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};
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public:
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RegularAutomata() = default;
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AcceptResult accept(const tAlphabetType* stream, ualni size) {
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mCurrentState = mStartState;
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ualni advancedIdx = 0;
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while (advancedIdx < size) {
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const tAlphabetType& symbol = *(stream + advancedIdx);
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if (!(symbol >= mSymbolRange.mBegin && symbol < mSymbolRange.mEnd)) {
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return { false, advancedIdx, {} };
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}
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mCurrentState = mTable.get({ (ualni) (symbol - mSymbolRange.mBegin), mCurrentState });
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if (mCurrentState == mStates.size()) {
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return { false, advancedIdx, {} };
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}
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if (mStates[mCurrentState].first) {
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return { true, advancedIdx, mStates[mCurrentState].second };
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}
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advancedIdx++;
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}
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return { false, advancedIdx, {} };
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}
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public:
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void construct(const FiniteStateAutomation<tAlphabetType, tStateType>& automata) {
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const auto range = automata.getAlphabetRange();
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mSymbolRange = { tAlphabetType(range.mBegin), tAlphabetType(range.mEnd) };
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auto range_len = ualni(mSymbolRange.mEnd - mSymbolRange.mBegin);
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auto sizeX = range_len ? range_len : 1;
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auto sizeY = (ualni) (automata.numStates());
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mTable.reserve({ sizeX, sizeY });
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mTable.assign(automata.numStates());
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mStates.reserve(sizeY);
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ualni idx = 0;
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for (auto state : *automata.getStates()) {
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mStates[idx] = { state->isAccepting(), state->getStateVal() };
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idx++;
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}
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idx = 0;
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for (auto state : *automata.getStates()) {
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if (&state.data() == automata.getStartState()) {
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mStartState = mCurrentState = idx;
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}
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idx++;
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}
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ualni stateIdx = 0;
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for (auto state : *automata.getStates()) {
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for (auto transition : *state->getTransitions()) {
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ualni stateIdx2 = 0;
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for (auto state2 : *automata.getStates()) {
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if (transition->getState() == &state2.data()) break;
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stateIdx2++;
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}
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auto const code = transition->getSymbol();
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mTable.set({ (ualni) (code - mSymbolRange.mBegin), (ualni) stateIdx }, stateIdx2);
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}
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stateIdx++;
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}
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}
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private:
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Buffer2D<ualni> mTable;
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Buffer<Pair<bool, tStateType>> mStates;
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ualni mCurrentState = 0;
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ualni mStartState = 0;
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Range<tAlphabetType> mSymbolRange = { 0, 0 };
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};
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}
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