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#import "NSPredicate+MGLAdditions.h"
#import "MGLValueEvaluator.h"
class FilterEvaluator {
public:
NSArray *getPredicates(std::vector<mbgl::style::Filter> filters) {
NSMutableArray *predicates = [NSMutableArray arrayWithCapacity:filters.size()];
for (auto filter : filters) {
[predicates addObject:mbgl::style::Filter::visit(filter, FilterEvaluator())];
}
return predicates;
}
NSExpression *getValues(std::vector<mbgl::Value> values) {
NSMutableArray *array = [NSMutableArray arrayWithCapacity:values.size()];
for (auto value : values) {
id constantValue = mbgl::Value::visit(value, ValueEvaluator());
[array addObject:[NSExpression expressionForConstantValue:constantValue]];
}
return [NSExpression expressionForAggregate:array];
}
NSPredicate *operator()(mbgl::style::NullFilter filter) {
return nil;
}
NSPredicate *operator()(mbgl::style::EqualsFilter filter) {
return [NSPredicate predicateWithFormat:@"%K == %@", @(filter.key.c_str()), mbgl::Value::visit(filter.value, ValueEvaluator())];
}
NSPredicate *operator()(mbgl::style::NotEqualsFilter filter) {
return [NSPredicate predicateWithFormat:@"%K != %@", @(filter.key.c_str()), mbgl::Value::visit(filter.value, ValueEvaluator())];
}
NSPredicate *operator()(mbgl::style::GreaterThanFilter filter) {
return [NSPredicate predicateWithFormat:@"%K > %@", @(filter.key.c_str()), mbgl::Value::visit(filter.value, ValueEvaluator())];
}
NSPredicate *operator()(mbgl::style::GreaterThanEqualsFilter filter) {
return [NSPredicate predicateWithFormat:@"%K >= %@", @(filter.key.c_str()), mbgl::Value::visit(filter.value, ValueEvaluator())];
}
NSPredicate *operator()(mbgl::style::LessThanFilter filter) {
return [NSPredicate predicateWithFormat:@"%K < %@", @(filter.key.c_str()), mbgl::Value::visit(filter.value, ValueEvaluator())];
}
NSPredicate *operator()(mbgl::style::LessThanEqualsFilter filter) {
return [NSPredicate predicateWithFormat:@"%K <= %@", @(filter.key.c_str()), mbgl::Value::visit(filter.value, ValueEvaluator())];
}
NSPredicate *operator()(mbgl::style::InFilter filter) {
return [NSPredicate predicateWithFormat:@"%K IN %@", @(filter.key.c_str()), getValues(filter.values)];
}
NSPredicate *operator()(mbgl::style::NotInFilter filter) {
return [NSPredicate predicateWithFormat:@"NOT %K IN %@", @(filter.key.c_str()), getValues(filter.values)];
}
NSPredicate *operator()(mbgl::style::AnyFilter filter) {
NSArray *subpredicates = getPredicates(filter.filters);
if (subpredicates.count) {
return [NSCompoundPredicate orPredicateWithSubpredicates:subpredicates];
}
return [NSPredicate predicateWithValue:NO];
}
NSPredicate *operator()(mbgl::style::AllFilter filter) {
// Convert [all, [>=, key, lower], [<=, key, upper]] to key BETWEEN {lower, upper}
if (filter.filters.size() == 2) {
auto leftFilter = filter.filters[0];
auto rightFilter = filter.filters[1];
std::string lowerKey;
std::string upperKey;
mbgl::Value lowerBound;
mbgl::Value upperBound;
if (leftFilter.is<mbgl::style::GreaterThanEqualsFilter>()) {
lowerKey = leftFilter.get<mbgl::style::GreaterThanEqualsFilter>().key;
lowerBound = leftFilter.get<mbgl::style::GreaterThanEqualsFilter>().value;
} else if (rightFilter.is<mbgl::style::GreaterThanEqualsFilter>()) {
lowerKey = rightFilter.get<mbgl::style::GreaterThanEqualsFilter>().key;
lowerBound = rightFilter.get<mbgl::style::GreaterThanEqualsFilter>().value;
}
if (leftFilter.is<mbgl::style::LessThanEqualsFilter>()) {
upperKey = leftFilter.get<mbgl::style::LessThanEqualsFilter>().key;
upperBound = leftFilter.get<mbgl::style::LessThanEqualsFilter>().value;
} else if (rightFilter.is<mbgl::style::LessThanEqualsFilter>()) {
upperKey = rightFilter.get<mbgl::style::LessThanEqualsFilter>().key;
upperBound = rightFilter.get<mbgl::style::LessThanEqualsFilter>().value;
}
if (!lowerBound.is<mbgl::NullValue>() && !upperBound.is<mbgl::NullValue>()
&& lowerKey == upperKey) {
return [NSPredicate predicateWithFormat:@"%K BETWEEN {%@, %@}",
@(lowerKey.c_str()),
mbgl::Value::visit(lowerBound, ValueEvaluator()),
mbgl::Value::visit(upperBound, ValueEvaluator())];
}
}
NSArray *subpredicates = getPredicates(filter.filters);
if (subpredicates.count) {
return [NSCompoundPredicate andPredicateWithSubpredicates:subpredicates];
}
return [NSPredicate predicateWithValue:YES];
}
NSPredicate *operator()(mbgl::style::NoneFilter filter) {
NSArray *subpredicates = getPredicates(filter.filters);
if (subpredicates.count > 1) {
NSCompoundPredicate *predicate = [NSCompoundPredicate orPredicateWithSubpredicates:subpredicates];
return [NSCompoundPredicate notPredicateWithSubpredicate:predicate];
} else if (subpredicates.count) {
return [NSCompoundPredicate notPredicateWithSubpredicate:subpredicates.firstObject];
} else {
return [NSPredicate predicateWithValue:YES];
}
}
NSPredicate *operator()(mbgl::style::HasFilter filter) {
return [NSPredicate predicateWithFormat:@"%K != nil", @(filter.key.c_str())];
}
NSPredicate *operator()(mbgl::style::NotHasFilter filter) {
return [NSPredicate predicateWithFormat:@"%K == nil", @(filter.key.c_str())];
}
};
@implementation NSPredicate (MGLAdditions)
- (mbgl::style::Filter)mgl_filter
{
if ([self isEqual:[NSPredicate predicateWithValue:YES]])
{
return mbgl::style::AllFilter();
}
if ([self isEqual:[NSPredicate predicateWithValue:NO]])
{
return mbgl::style::AnyFilter();
}
if ([self.predicateFormat hasPrefix:@"BLOCKPREDICATE("])
{
[NSException raise:NSInvalidArgumentException
format:@"Block-based predicates are not supported."];
}
[NSException raise:NSInvalidArgumentException
format:@"Unrecognized predicate type."];
return {};
}
+ (instancetype)mgl_predicateWithFilter:(mbgl::style::Filter)filter
{
FilterEvaluator evaluator;
return mbgl::style::Filter::visit(filter, evaluator);
}
@end
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