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#include <cctype>
#include <gtest/gtest.h>
#include <pog/automaton.h>
using namespace pog;
class TestAutomaton : public ::testing::Test
{
public:
using SetupGrammarTuple = std::tuple<std::string, SymbolKind>;
TestAutomaton() : grammar() {}
template <typename... Args>
State<int> new_state(const Args&... args)
{
State<int> state;
_new_state(state, args...);
return state;
}
void _new_state(State<int>& state, const std::string& lhs, const std::vector<std::string>& left_rhs, const std::vector<std::string>& right_rhs)
{
_add_item_to_state(state, lhs, left_rhs, right_rhs);
}
template <typename... Args>
void _new_state(State<int>& state, const std::string& lhs, const std::vector<std::string>& left_rhs, const std::vector<std::string>& right_rhs, const Args&... args)
{
_add_item_to_state(state, lhs, left_rhs, right_rhs);
_new_state(state, args...);
}
void _add_item_to_state(State<int>& state, const std::string& lhs, const std::vector<std::string>& left_rhs, const std::vector<std::string>& right_rhs)
{
auto lhs_sym = grammar.add_symbol(SymbolKind::Nonterminal, lhs);
auto sym_transform = [this](const auto& name) {
return grammar.add_symbol(std::islower(name[0]) ? SymbolKind::Terminal : SymbolKind::Nonterminal, name);
};
std::vector<const Symbol<int>*> left_rhs_syms(left_rhs.size());
std::vector<const Symbol<int>*> right_rhs_syms(right_rhs.size());
std::vector<const Symbol<int>*> rhs_syms(left_rhs.size() + right_rhs.size());
std::transform(left_rhs.begin(), left_rhs.end(), left_rhs_syms.begin(), sym_transform);
std::transform(right_rhs.begin(), right_rhs.end(), right_rhs_syms.begin(), sym_transform);
std::copy(left_rhs_syms.begin(), left_rhs_syms.end(), rhs_syms.begin());
std::copy(right_rhs_syms.begin(), right_rhs_syms.end(), rhs_syms.begin() + left_rhs.size());
Rule<int>* rule = nullptr;
for (auto& r : grammar.get_rules())
{
bool rhs_equal = std::equal(r->get_rhs().begin(), r->get_rhs().end(), rhs_syms.begin(), rhs_syms.end(), [](const auto* sym1, const auto* sym2) {
return sym1->get_index() == sym2->get_index();
});
if (r->get_lhs() == lhs_sym && rhs_equal)
{
rule = r.get();
break;
}
}
if (!rule)
rule = grammar.add_rule(lhs_sym, rhs_syms, [](auto&&) -> int { return 0; });
state.add_item(Item<int>{rule, left_rhs.size()});
}
Grammar<int> grammar;
};
TEST_F(TestAutomaton,
AddState) {
auto state = new_state(
"S", std::vector<std::string>{}, std::vector<std::string>{"a", "S", "b"},
"S", std::vector<std::string>{}, std::vector<std::string>{}
);
Automaton<int> a(&grammar);
auto result = a.add_state(std::move(state));
EXPECT_TRUE(result.second);
EXPECT_EQ(result.first->to_string(), "S -> <*> a S b\nS -> <*> <eps>");
}
TEST_F(TestAutomaton,
AddStateUnique) {
auto state1 = new_state(
"S", std::vector<std::string>{}, std::vector<std::string>{"a", "S", "b"},
"S", std::vector<std::string>{}, std::vector<std::string>{}
);
auto state2 = new_state(
"S", std::vector<std::string>{"a"}, std::vector<std::string>{"S", "b"}
);
Automaton<int> a(&grammar);
auto result1 = a.add_state(std::move(state1));
auto result2 = a.add_state(std::move(state2));
EXPECT_TRUE(result1.second);
EXPECT_EQ(result1.first->to_string(), "S -> <*> a S b\nS -> <*> <eps>");
EXPECT_TRUE(result2.second);
EXPECT_EQ(result2.first->to_string(), "S -> a <*> S b");
}
TEST_F(TestAutomaton,
AddStateDuplicate) {
auto state1 = new_state(
"S", std::vector<std::string>{}, std::vector<std::string>{"a", "S", "b"},
"S", std::vector<std::string>{}, std::vector<std::string>{}
);
auto state2 = new_state(
"S", std::vector<std::string>{}, std::vector<std::string>{"a", "S", "b"},
"S", std::vector<std::string>{}, std::vector<std::string>{}
);
Automaton<int> a(&grammar);
auto result1 = a.add_state(std::move(state1));
auto result2 = a.add_state(std::move(state2));
EXPECT_TRUE(result1.second);
EXPECT_EQ(result1.first->to_string(), "S -> <*> a S b\nS -> <*> <eps>");
EXPECT_FALSE(result2.second);
EXPECT_EQ(result1.first, result2.first);
}
TEST_F(TestAutomaton,
GetState) {
auto state = new_state(
"S", std::vector<std::string>{}, std::vector<std::string>{"a", "S", "b"},
"S", std::vector<std::string>{}, std::vector<std::string>{}
);
Automaton<int> a(&grammar);
a.add_state(std::move(state));
state = new_state(
"S", std::vector<std::string>{}, std::vector<std::string>{"a", "S", "b"},
"S", std::vector<std::string>{}, std::vector<std::string>{}
);
EXPECT_EQ(*a.get_state(0), state);
}
TEST_F(TestAutomaton,
Closure) {
auto state = new_state(
"S", std::vector<std::string>{"A"}, std::vector<std::string>{"S", "b"}
);
new_state(
"A", std::vector<std::string>{"a"}, std::vector<std::string>{"A"},
"A", std::vector<std::string>{}, std::vector<std::string>{}
);
Automaton<int> a(&grammar);
a.closure(state);
EXPECT_EQ(state.to_string(), "S -> A <*> S b\nS -> <*> A S b\nA -> <*> a A\nA -> <*> <eps>");
}
TEST_F(TestAutomaton,
ConstructStates) {
grammar.set_start_symbol(grammar.add_symbol(SymbolKind::Nonterminal, "S"));
new_state(
"S", std::vector<std::string>{}, std::vector<std::string>{"a", "S", "b"},
"S", std::vector<std::string>{}, std::vector<std::string>{}
);
Automaton<int> a(&grammar);
a.construct_states();
EXPECT_EQ(a.get_states().size(), 5u);
EXPECT_EQ(a.get_states()[0]->to_string(), "@start -> <*> S @end\nS -> <*> a S b\nS -> <*> <eps>");
EXPECT_EQ(a.get_states()[1]->to_string(), "@start -> S <*> @end");
EXPECT_EQ(a.get_states()[2]->to_string(), "S -> a <*> S b\nS -> <*> a S b\nS -> <*> <eps>");
EXPECT_EQ(a.get_states()[3]->to_string(), "S -> a S <*> b");
EXPECT_EQ(a.get_states()[4]->to_string(), "S -> a S b <*>");
}
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