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#pragma once
#include <mbgl/style/filter.hpp>
#include <mbgl/util/geometry.hpp>
#include <type_traits>
namespace mbgl {
namespace style {
/*
A visitor that evaluates a `Filter` for a given feature type and properties. For maximum
flexibility, it is templated on the PropertyAccessor type, which must be a callable type with
function signature `optional<Value> (const std::string&)`, returning the value for the given
key, if it exists.
Use via `Filter::operator()`. For example:
if (filter(feature.getType(), [&] (const std::string& key) { return feature.getValue(key); })) {
// matches the filter
} else {
// does not match
}
*/
template <class PropertyAccessor>
class FilterEvaluator {
public:
const FeatureType featureType;
const PropertyAccessor propertyAccessor;
bool operator()(const NullFilter&) const {
return true;
}
bool operator()(const EqualsFilter& filter) const {
optional<Value> actual = getValue(filter.key);
return actual && equal(*actual, filter.value);
}
bool operator()(const NotEqualsFilter& filter) const {
optional<Value> actual = getValue(filter.key);
return !actual || !equal(*actual, filter.value);
}
bool operator()(const LessThanFilter& filter) const {
optional<Value> actual = getValue(filter.key);
return actual && compare(*actual, filter.value, [] (const auto& lhs_, const auto& rhs_) { return lhs_ < rhs_; });
}
bool operator()(const LessThanEqualsFilter& filter) const {
optional<Value> actual = getValue(filter.key);
return actual && compare(*actual, filter.value, [] (const auto& lhs_, const auto& rhs_) { return lhs_ <= rhs_; });
}
bool operator()(const GreaterThanFilter& filter) const {
optional<Value> actual = getValue(filter.key);
return actual && compare(*actual, filter.value, [] (const auto& lhs_, const auto& rhs_) { return lhs_ > rhs_; });
}
bool operator()(const GreaterThanEqualsFilter& filter) const {
optional<Value> actual = getValue(filter.key);
return actual && compare(*actual, filter.value, [] (const auto& lhs_, const auto& rhs_) { return lhs_ >= rhs_; });
}
bool operator()(const InFilter& filter) const {
optional<Value> actual = getValue(filter.key);
if (!actual)
return false;
for (const auto& v: filter.values) {
if (equal(*actual, v)) {
return true;
}
}
return false;
}
bool operator()(const NotInFilter& filter) const {
optional<Value> actual = getValue(filter.key);
if (!actual)
return true;
for (const auto& v: filter.values) {
if (equal(*actual, v)) {
return false;
}
}
return true;
}
bool operator()(const AnyFilter& filter) const {
for (const auto& f: filter.filters) {
if (Filter::visit(f, *this)) {
return true;
}
}
return false;
}
bool operator()(const AllFilter& filter) const {
for (const auto& f: filter.filters) {
if (!Filter::visit(f, *this)) {
return false;
}
}
return true;
}
bool operator()(const NoneFilter& filter) const {
for (const auto& f: filter.filters) {
if (Filter::visit(f, *this)) {
return false;
}
}
return true;
}
bool operator()(const HasFilter& filter) const {
return bool(getValue(filter.key));
}
bool operator()(const NotHasFilter& filter) const {
return !getValue(filter.key);
}
private:
optional<Value> getValue(const std::string& key_) const {
return key_ == "$type"
? optional<Value>(uint64_t(featureType))
: propertyAccessor(key_);
}
template <class Op>
struct Comparator {
const Op& op;
template <class T>
bool operator()(const T& lhs, const T& rhs) const {
return op(lhs, rhs);
}
template <class T0, class T1>
auto operator()(const T0& lhs, const T1& rhs) const
-> typename std::enable_if_t<std::is_arithmetic<T0>::value && !std::is_same<T0, bool>::value &&
std::is_arithmetic<T1>::value && !std::is_same<T1, bool>::value, bool> {
return op(double(lhs), double(rhs));
}
template <class T0, class T1>
auto operator()(const T0&, const T1&) const
-> typename std::enable_if_t<!std::is_arithmetic<T0>::value || std::is_same<T0, bool>::value ||
!std::is_arithmetic<T1>::value || std::is_same<T1, bool>::value, bool> {
return false;
}
bool operator()(const NullValue&,
const NullValue&) const {
// Should be unreachable; null is not currently allowed by the style specification.
assert(false);
return false;
}
bool operator()(const std::vector<Value>&,
const std::vector<Value>&) const {
// Should be unreachable; nested values are not currently allowed by the style specification.
assert(false);
return false;
}
bool operator()(const std::unordered_map<std::string, Value>&,
const std::unordered_map<std::string, Value>&) const {
// Should be unreachable; nested values are not currently allowed by the style specification.
assert(false);
return false;
}
};
template <class Op>
bool compare(const Value& lhs, const Value& rhs, const Op& op) const {
return Value::binary_visit(lhs, rhs, Comparator<Op> { op });
}
bool equal(const Value& lhs, const Value& rhs) const {
return compare(lhs, rhs, [] (const auto& lhs_, const auto& rhs_) { return lhs_ == rhs_; });
}
};
template <class PropertyAccessor>
bool Filter::operator()(FeatureType type, PropertyAccessor accessor) const {
return FilterBase::visit(*this, FilterEvaluator<PropertyAccessor> { type, accessor });
}
} // namespace style
} // namespace mbgl
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