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#pragma once
#include <mbgl/style/filter.hpp>
#include <mbgl/style/conversion.hpp>
#include <mbgl/util/geometry.hpp>
namespace mbgl {
namespace style {
namespace conversion {
template <>
struct Converter<Filter> {
public:
template <class V>
Result<Filter> operator()(const V& value) const {
if (!isArray(value)) {
return Error { "filter expression must be an array" };
}
if (arrayLength(value) < 1) {
return Error { "filter expression must have at least 1 element" };
}
optional<std::string> op = toString(arrayMember(value, 0));
if (!op) {
return Error { "filter operator must be a string" };
}
if (*op == "==") {
return convertEqualityFilter<EqualsFilter, TypeEqualsFilter, IdentifierEqualsFilter>(value);
} else if (*op == "!=") {
return convertEqualityFilter<NotEqualsFilter, TypeNotEqualsFilter, IdentifierNotEqualsFilter>(value);
} else if (*op == ">") {
return convertBinaryFilter<GreaterThanFilter>(value);
} else if (*op == ">=") {
return convertBinaryFilter<GreaterThanEqualsFilter>(value);
} else if (*op == "<") {
return convertBinaryFilter<LessThanFilter>(value);
} else if (*op == "<=") {
return convertBinaryFilter<LessThanEqualsFilter>(value);
} else if (*op == "in") {
return convertSetFilter<InFilter, TypeInFilter, IdentifierInFilter>(value);
} else if (*op == "!in") {
return convertSetFilter<NotInFilter, TypeNotInFilter, IdentifierNotInFilter>(value);
} else if (*op == "all") {
return convertCompoundFilter<AllFilter>(value);
} else if (*op == "any") {
return convertCompoundFilter<AnyFilter>(value);
} else if (*op == "none") {
return convertCompoundFilter<NoneFilter>(value);
} else if (*op == "has") {
return convertUnaryFilter<HasFilter, HasIdentifierFilter>(value);
} else if (*op == "!has") {
return convertUnaryFilter<NotHasFilter, NotHasIdentifierFilter>(value);
}
return Error { "filter operator must be one of \"==\", \"!=\", \">\", \">=\", \"<\", \"<=\", \"in\", \"!in\", \"all\", \"any\", \"none\", \"has\", or \"!has\"" };
}
private:
Result<Value> normalizeValue(const optional<Value>& value) const {
if (!value) {
return Error { "filter expression value must be a boolean, number, or string" };
} else {
return *value;
}
}
template <class V>
Result<FeatureType> toFeatureType(const V& value) const {
optional<std::string> type = toString(value);
if (!type) {
return Error { "value for $type filter must be a string" };
} else if (*type == "Point") {
return FeatureType::Point;
} else if (*type == "LineString") {
return FeatureType::LineString;
} else if (*type == "Polygon") {
return FeatureType::Polygon;
} else {
return Error { "value for $type filter must be Point, LineString, or Polygon" };
}
}
template <class V>
Result<FeatureIdentifier> toFeatureIdentifier(const V& value) const {
optional<Value> identifier = toValue(value);
if (!identifier) {
return Error { "filter expression value must be a boolean, number, or string" };
} else {
return (*identifier).match(
[] (uint64_t t) -> Result<FeatureIdentifier> { return t; },
[] ( int64_t t) -> Result<FeatureIdentifier> { return t; },
[] ( double t) -> Result<FeatureIdentifier> { return t; },
[] (const std::string& t) -> Result<FeatureIdentifier> { return t; },
[] (const auto&) -> Result<FeatureIdentifier> {
return Error { "filter expression value must be a boolean, number, or string" };
});
}
}
template <class FilterType, class IdentifierFilterType, class V>
Result<Filter> convertUnaryFilter(const V& value) const {
if (arrayLength(value) < 2) {
return Error { "filter expression must have 2 elements" };
}
optional<std::string> key = toString(arrayMember(value, 1));
if (!key) {
return Error { "filter expression key must be a string" };
}
if (*key == "$id") {
return IdentifierFilterType {};
} else {
return FilterType { *key };
}
}
template <class FilterType, class TypeFilterType, class IdentifierFilterType, class V>
Result<Filter> convertEqualityFilter(const V& value) const {
if (arrayLength(value) < 3) {
return Error { "filter expression must have 3 elements" };
}
optional<std::string> key = toString(arrayMember(value, 1));
if (!key) {
return Error { "filter expression key must be a string" };
}
if (*key == "$type") {
Result<FeatureType> filterValue = toFeatureType(arrayMember(value, 2));
if (!filterValue) {
return filterValue.error();
}
return TypeFilterType { *filterValue };
} else if (*key == "$id") {
Result<FeatureIdentifier> filterValue = toFeatureIdentifier(arrayMember(value, 2));
if (!filterValue) {
return filterValue.error();
}
return IdentifierFilterType { *filterValue };
} else {
Result<Value> filterValue = normalizeValue(toValue(arrayMember(value, 2)));
if (!filterValue) {
return filterValue.error();
}
return FilterType { *key, *filterValue };
}
}
template <class FilterType, class V>
Result<Filter> convertBinaryFilter(const V& value) const {
if (arrayLength(value) < 3) {
return Error { "filter expression must have 3 elements" };
}
optional<std::string> key = toString(arrayMember(value, 1));
if (!key) {
return Error { "filter expression key must be a string" };
}
Result<Value> filterValue = normalizeValue(toValue(arrayMember(value, 2)));
if (!filterValue) {
return filterValue.error();
}
return FilterType { *key, *filterValue };
}
template <class FilterType, class TypeFilterType, class IdentifierFilterType, class V>
Result<Filter> convertSetFilter(const V& value) const {
if (arrayLength(value) < 2) {
return Error { "filter expression must at least 2 elements" };
}
optional<std::string> key = toString(arrayMember(value, 1));
if (!key) {
return Error { "filter expression key must be a string" };
}
if (*key == "$type") {
std::vector<FeatureType> values;
for (std::size_t i = 2; i < arrayLength(value); ++i) {
Result<FeatureType> filterValue = toFeatureType(arrayMember(value, i));
if (!filterValue) {
return filterValue.error();
}
values.push_back(*filterValue);
}
return TypeFilterType { std::move(values) };
} else if (*key == "$id") {
std::vector<FeatureIdentifier> values;
for (std::size_t i = 2; i < arrayLength(value); ++i) {
Result<FeatureIdentifier> filterValue = toFeatureIdentifier(arrayMember(value, i));
if (!filterValue) {
return filterValue.error();
}
values.push_back(*filterValue);
}
return IdentifierFilterType { std::move(values) };
} else {
std::vector<Value> values;
for (std::size_t i = 2; i < arrayLength(value); ++i) {
Result<Value> filterValue = normalizeValue(toValue(arrayMember(value, i)));
if (!filterValue) {
return filterValue.error();
}
values.push_back(*filterValue);
}
return FilterType { *key, std::move(values) };
}
}
template <class FilterType, class V>
Result<Filter> convertCompoundFilter(const V& value) const {
std::vector<Filter> filters;
for (std::size_t i = 1; i < arrayLength(value); ++i) {
Result<Filter> element = operator()(arrayMember(value, i));
if (!element) {
return element.error();
}
filters.push_back(*element);
}
return FilterType { std::move(filters) };
}
};
} // namespace conversion
} // namespace style
} // namespace mbgl
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