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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "resultlist.h"
#include <bitset>
#include <ostream>
namespace document::select {
ResultList::ResultList() = default;
ResultList::ResultList(ResultList &&) noexcept = default;
ResultList & ResultList::operator = (ResultList &&) noexcept = default;
ResultList::~ResultList() = default;
ResultList::ResultList(const Result& result) {
add(VariableMap(), result);
}
void
ResultList::add(VariableMap variables, const Result& result)
{
_results.emplace_back(std::move(variables), &result);
}
void
ResultList::print(std::ostream& out, bool, const std::string&) const
{
out << "ResultList(";
for (uint32_t i = 0; i < _results.size(); i++) {
if (!_results[i].first.empty()) {
out << _results[i].first.toString() << " => ";
}
out << _results[i].second->toString() << " ";
}
out << ")";
}
namespace {
const Result &
combineResultsLocal(const ResultList::Results & results)
{
if (results.empty()) {
return Result::False;
}
bool foundFalse = false;
for (const auto & it : results) {
if (*it.second == Result::True) {
return Result::True;
} else if (*it.second == Result::False) {
foundFalse = true;
}
}
return (foundFalse) ? Result::False : Result::Invalid;
}
}
const Result&
ResultList::combineResults() const {
return combineResultsLocal(_results);
}
bool
ResultList::combineVariables(VariableMap& combination, const VariableMap& a, const VariableMap& b)
{
// First, verify that all variables are overlapping
for (const auto & ovar : a) {
auto found(b.find(ovar.first));
if (found != b.end()) {
if (!(found->second == ovar.second)) {
return false;
}
}
}
for (const auto & ivar : b) {
auto found(a.find(ivar.first));
if (found != a.end()) {
if (!(found->second == ivar.second)) {
return false;
}
}
}
// Ok, variables are overlapping. Add all variables from input to output.
for (const auto & var : a) {
combination[var.first] = var.second;
}
for (const auto & var : b) {
combination[var.first] = var.second;
}
return true;
}
ResultList
ResultList::operator&&(const ResultList& other) const
{
ResultList results;
std::bitset<3> resultForNoVariables;
for (const auto & it : _results) {
for (const auto & it2 : other._results) {
VariableMap vars;
if ( combineVariables(vars, it.first, it2.first) ) {
const Result & result = *it.second && *it2.second;
if (vars.empty()) {
resultForNoVariables.set(result.toEnum());
} else {
results.add(std::move(vars), result);
}
}
}
}
for (uint32_t i(0); i < resultForNoVariables.size(); i++) {
if (resultForNoVariables[i]) {
results.add(VariableMap(), Result::fromEnum(i));
}
}
return results;
}
ResultList
ResultList::operator||(const ResultList& other) const
{
ResultList results;
std::bitset<3> resultForNoVariables;
for (const auto & it : _results) {
for (const auto & it2 : other._results) {
VariableMap vars;
if (combineVariables(vars, it.first, it2.first)) {
const Result & result = *it.second || *it2.second;
if (vars.empty()) {
resultForNoVariables.set(result.toEnum());
} else {
results.add(std::move(vars), result);
}
}
}
}
for (uint32_t i(0); i < resultForNoVariables.size(); i++) {
if (resultForNoVariables[i]) {
results.add(VariableMap(), Result::fromEnum(i));
}
}
return results;
}
ResultList
ResultList::operator!() && {
ResultList result;
for (auto & it : _results) {
result.add(std::move(it.first), !*it.second);
}
return result;
}
bool ResultList::operator==(const ResultList& other) const {
return (combineResultsLocal(_results) == combineResultsLocal(other._results));
}
}
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