combinators.inl
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#ifndef CRUCIBLE_PARSING_COMBINATORS_INL
#define CRUCIBLE_PARSING_COMBINATORS_INL
#include "crucible/parsing/combinators.hpp"
#include <sstream>
namespace crucible::parsing::combinators {
template<typename LHS_PARSER, typename RHS_PARSER>
OneOf<LHS_PARSER, RHS_PARSER>::OneOf(LHS_PARSER const &lhs_parser, RHS_PARSER const &rhs_parser) :
my_lhs_parser { lhs_parser },
my_rhs_parser { rhs_parser } {
}
template<typename LHS_PARSER, typename RHS_PARSER>
auto OneOf<LHS_PARSER, RHS_PARSER>::operator()(StateType const &state) const -> ResultType {
auto const lhs_result { my_lhs_parser(state) };
auto const rhs_result { my_rhs_parser(state) };
if (lhs_result.has_rhs() && rhs_result.has_rhs()) {
return errors::make_reject(state, errors::AmbiguousMatch {});
}
if (lhs_result.has_rhs()) {
return lhs_result;
}
if (rhs_result.has_rhs()) {
return rhs_result;
}
return errors::make_reject(state, errors::UnexpectedInput {});
}
template<typename LHS_PARSER, typename RHS_PARSER>
Pair<LHS_PARSER, RHS_PARSER>::Pair(LHS_PARSER const &lhs_parser, RHS_PARSER const &rhs_parser) :
my_lhs_parser { lhs_parser },
my_rhs_parser { rhs_parser } {
}
template<typename LHS_PARSER, typename RHS_PARSER>
auto Pair<LHS_PARSER, RHS_PARSER>::operator()(StateType const &state) const -> ResultType {
auto const lhs_result { my_lhs_parser(state) };
if (lhs_result.has_lhs()) {
auto const &reject = lhs_result.get_lhs();
auto const &error = reject.get_error();
return errors::make_reject(state, error);
}
auto const &lhs_accept { lhs_result.get_rhs() };
auto const &lhs_next_state { lhs_accept.get_state() };
auto const rhs_result { my_rhs_parser(lhs_next_state) };
if (rhs_result.has_lhs()) {
auto const &reject = rhs_result.get_lhs();
auto const &error = reject.get_error();
return errors::make_reject(state, error);
}
auto const &rhs_accept { rhs_result.get_rhs() };
auto const &rhs_next_state { rhs_accept.get_state() };
auto const &lhs_value { lhs_accept.get_value() };
auto const &rhs_value { rhs_accept.get_value() };
return errors::make_accept(rhs_next_state, std::make_pair(lhs_value, rhs_value));
}
template<typename HEAD_PARSER, typename ...TAIL_PARSERS>
Tuple<HEAD_PARSER, TAIL_PARSERS...>::Tuple(HEAD_PARSER const &head_parser, TAIL_PARSERS &&...tail_parsers) :
my_head_parser { head_parser },
my_tail_parser { std::forward<TAIL_PARSERS>(tail_parsers)... } {
}
template<typename HEAD_PARSER, typename ...TAIL_PARSERS>
auto Tuple<HEAD_PARSER, TAIL_PARSERS...>::operator()(StateType const &state) const -> ResultType {
auto const head_result { my_head_parser(state) };
if (head_result.has_lhs()) {
auto const &head_reject { head_result.get_lhs() };
auto const &head_error { head_reject.get_error() };
return errors::make_reject(state, head_error);
}
auto const &head_accept { head_result.get_rhs() };
auto const &next_state { head_accept.get_state() };
auto const tail_result { my_tail_parser(next_state) };
if (tail_result.has_lhs()) {
auto const &tail_reject { tail_result.get_lhs() };
auto const &tail_error { tail_reject.get_error() };
return errors::make_reject(state, tail_error);
}
auto const &tail_accept { tail_result.get_rhs() };
auto const &final_state { tail_accept.get_state() };
auto const &head_value { head_accept.get_value() };
auto const &tail_value { tail_accept.get_value() };
return errors::make_accept(final_state, std::tuple_cat(std::make_tuple(head_value), tail_value));
}
template<typename PARSER>
Tuple<PARSER>::Tuple(PARSER const &parser) :
my_parser { parser } {
}
template<typename PARSER>
auto Tuple<PARSER>::operator()(StateType const &state) const -> ResultType {
auto const result = my_parser(state);
if (result.has_lhs()) {
auto const &reject { result.get_lhs() };
auto const &error { reject.get_error() };
return errors::make_reject(state, error);
}
auto const &accept { result.get_rhs() };
auto const &final_state { accept.get_state() };
auto const &value { accept.get_value() };
return errors::make_accept(final_state, std::make_tuple(value));
}
template<typename PARSER, typename FUNCTION>
Into<PARSER, FUNCTION>::Into(PARSER const &parser, FUNCTION const &function) :
my_parser { parser },
my_function { function } {
}
template<typename PARSER, typename FUNCTION>
auto Into<PARSER, FUNCTION>::operator()(StateType const &state) const -> ResultType {
auto const lhs_result = my_parser(state);
if (lhs_result.has_lhs()) {
auto const &reject = lhs_result.get_lhs();
auto const &error = reject.get_error();
return errors::make_reject(state, error);
}
auto const &lhs_accept = lhs_result.get_rhs();
auto const rhs_parser = my_function(lhs_accept.get_value());
auto const rhs_result = rhs_parser(lhs_accept.get_state());
if (rhs_result.has_lhs()) {
auto const &reject = rhs_result.get_lhs();
auto const &error = reject.get_error();
return errors::make_reject(state, error);
}
auto const &rhs_accept = rhs_result.get_rhs();
return errors::make_accept(rhs_accept.get_state(), rhs_accept.get_value());
}
template<typename PARSER>
SequenceOf<PARSER>::SequenceOf(PARSER const &parser, std::size_t const repetitions) :
my_parser { parser },
my_repetitions { repetitions } {
}
template<typename PARSER>
auto SequenceOf<PARSER>::operator()(StateType const &state) const -> ResultType {
std::vector<ElementType> values {};
StateType next_state { state };
for (std::size_t i { 0 }; i < my_repetitions; ++i) {
auto const result { my_parser(next_state) };
if (result.has_lhs()) {
auto const &reject = result.get_lhs();
auto const &error = reject.get_error();
return errors::make_reject(state, error);
}
auto const &accept { result.get_rhs() };
values.emplace_back(accept.get_value());
next_state = accept.get_state();
}
return errors::make_accept(next_state, values);
}
template<typename LHS_PARSER, typename RHS_PARSER>
auto make_one_of(LHS_PARSER const &lhs_parser, RHS_PARSER const &rhs_parser) -> OneOf<LHS_PARSER, RHS_PARSER> {
return { lhs_parser, rhs_parser };
}
template<typename LHS_PARSER, typename RHS_PARSER>
auto make_pair(LHS_PARSER const &lhs_parser, RHS_PARSER const &rhs_parser) -> Pair<LHS_PARSER, RHS_PARSER> {
return { lhs_parser, rhs_parser };
}
template<typename ...PARSERS>
auto make_tuple(PARSERS &&...parsers) -> Tuple<PARSERS...> {
return { std::forward<PARSERS>(parsers)... };
}
template<typename PARSER, typename FUNCTION>
auto make_into(PARSER const &parser, FUNCTION const &function) -> Into<PARSER, FUNCTION> {
return { parser, function };
}
template<typename PARSER>
auto make_sequence_of(PARSER const &parser, std::size_t const repetitions) -> SequenceOf<PARSER> {
return { parser, repetitions };
}
namespace operators {
template<typename LHS_PARSER, typename RHS_PARSER>
auto operator^(LHS_PARSER const &lhs_parser, RHS_PARSER const &rhs_parser) -> OneOf<LHS_PARSER, RHS_PARSER> {
return { lhs_parser, rhs_parser };
}
template<typename LHS_PARSER, typename RHS_PARSER>
auto operator&(LHS_PARSER const &lhs_parser, RHS_PARSER const &rhs_parser) -> Pair<LHS_PARSER, RHS_PARSER> {
return { lhs_parser, rhs_parser };
}
template<typename PARSER, typename FUNCTION>
auto operator>>(PARSER const &parser, FUNCTION const &function) -> Into<PARSER, FUNCTION> {
return { parser, function };
}
template<typename PARSER>
auto operator*(PARSER const &parser, std::size_t const repetitions) -> SequenceOf<PARSER> {
return { parser, repetitions };
}
}
}
#endif // CRUCIBLE_PARSING_COMBINATORS_INL