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#import "NSPredicate+MGLPrivateAdditions.h"
#import "MGLValueEvaluator.h"
#import "MGLStyleValue_Private.h"
#include <mbgl/style/conversion/filter.hpp>
@implementation NSPredicate (MGLPrivateAdditions)
- (mbgl::style::Filter)mgl_filter
{
mbgl::style::conversion::Error valueError;
NSArray *jsonObject = self.mgl_jsonExpressionObject;
auto value = mbgl::style::conversion::convert<mbgl::style::Filter>(mbgl::style::conversion::makeConvertible(jsonObject), valueError);
if (!value) {
[NSException raise:NSInvalidArgumentException
format:@"Invalid filter value: %@", @(valueError.message.c_str())];
return {};
}
mbgl::style::Filter filter = std::move(*value);
return filter;
}
+ (instancetype)mgl_predicateWithFilter:(mbgl::style::Filter)filter
{
if (filter.expression) {
id jsonObject = MGLJSONObjectFromMBGLExpression(**filter.expression);
return [NSPredicate predicateWithMGLJSONObject:jsonObject];
} else {
return nil;
}
}
@end
@implementation NSPredicate (MGLAdditions)
NSArray *MGLSubpredicatesWithJSONObjects(NSArray *objects) {
NSMutableArray *subpredicates = [NSMutableArray arrayWithCapacity:objects.count];
for (id object in objects) {
NSPredicate *predicate = [NSPredicate predicateWithMGLJSONObject:object];
[subpredicates addObject:predicate];
}
return subpredicates;
}
static NSDictionary * const MGLPredicateOperatorTypesByJSONOperator = @{
@"==": @(NSEqualToPredicateOperatorType),
@"!=": @(NSNotEqualToPredicateOperatorType),
@"<": @(NSLessThanPredicateOperatorType),
@"<=": @(NSLessThanOrEqualToPredicateOperatorType),
@">": @(NSGreaterThanPredicateOperatorType),
@">=": @(NSGreaterThanOrEqualToPredicateOperatorType),
};
+ (instancetype)predicateWithMGLJSONObject:(id)object {
if ([object isEqual:@YES]) {
return [NSPredicate predicateWithValue:YES];
}
if ([object isEqual:@NO]) {
return [NSPredicate predicateWithValue:NO];
}
NSAssert([object isKindOfClass:[NSArray class]], @"Condition for case expression should be an expression.");
NSArray *objects = (NSArray *)object;
NSString *op = objects.firstObject;
NSNumber *operatorTypeNumber = MGLPredicateOperatorTypesByJSONOperator[op];
if (operatorTypeNumber) {
NSPredicateOperatorType operatorType = (NSPredicateOperatorType)[operatorTypeNumber unsignedIntegerValue];
NSComparisonPredicateOptions options = 0;
if (objects.count > 3) {
NSArray *collatorExpression = objects[3];
NSCAssert([collatorExpression isKindOfClass:[NSArray class]], @"Collators must be dictionaries.");
NSCAssert(collatorExpression.count == 2, @"Malformed collator expression");
NSDictionary *collator = collatorExpression[1];
NSCAssert([collator isKindOfClass:[NSDictionary class]], @"Malformed collator in collator expression");
// Predicate options can’t express specific locales as collators can.
if (!collator[@"locale"]) {
if ([(collator[@"case-sensitive"] ?: @YES) isEqual:@NO]) {
options |= NSCaseInsensitivePredicateOption;
}
if ([(collator[@"diacritic-sensitive"] ?: @YES) isEqual:@NO]) {
options |= NSDiacriticInsensitivePredicateOption;
}
}
}
NSArray *subexpressions = MGLSubexpressionsWithJSONObjects([objects subarrayWithRange:NSMakeRange(1, objects.count - 1)]);
return [NSComparisonPredicate predicateWithLeftExpression:subexpressions[0]
rightExpression:subexpressions[1]
modifier:NSDirectPredicateModifier
type:operatorType
options:options];
}
if ([op isEqualToString:@"!"]) {
NSArray *subpredicates = MGLSubpredicatesWithJSONObjects([objects subarrayWithRange:NSMakeRange(1, objects.count - 1)]);
if (subpredicates.count > 1) {
NSCompoundPredicate *predicate = [NSCompoundPredicate orPredicateWithSubpredicates:subpredicates];
return [NSCompoundPredicate notPredicateWithSubpredicate:predicate];
}
if (subpredicates.count) {
return [NSCompoundPredicate notPredicateWithSubpredicate:subpredicates.firstObject];
}
return [NSPredicate predicateWithValue:YES];
}
if ([op isEqualToString:@"all"]) {
NSArray<NSPredicate *> *subpredicates = MGLSubpredicatesWithJSONObjects([objects subarrayWithRange:NSMakeRange(1, objects.count - 1)]);
if (subpredicates.count == 2) {
// Determine if the expression is of BETWEEN type
if ([subpredicates[0] isKindOfClass:[NSComparisonPredicate class]] &&
[subpredicates[1] isKindOfClass:[NSComparisonPredicate class]]) {
NSComparisonPredicate *leftCondition = (NSComparisonPredicate *)subpredicates[0];
NSComparisonPredicate *rightCondition = (NSComparisonPredicate *)subpredicates[1];
NSArray *limits;
NSExpression *leftConditionExpression;
if(leftCondition.predicateOperatorType == NSGreaterThanOrEqualToPredicateOperatorType &&
rightCondition.predicateOperatorType == NSLessThanOrEqualToPredicateOperatorType) {
limits = @[leftCondition.rightExpression, rightCondition.rightExpression];
leftConditionExpression = leftCondition.leftExpression;
} else if (leftCondition.predicateOperatorType == NSLessThanOrEqualToPredicateOperatorType &&
rightCondition.predicateOperatorType == NSLessThanOrEqualToPredicateOperatorType) {
limits = @[leftCondition.leftExpression, rightCondition.rightExpression];
leftConditionExpression = leftCondition.rightExpression;
} else if(leftCondition.predicateOperatorType == NSLessThanOrEqualToPredicateOperatorType &&
rightCondition.predicateOperatorType == NSGreaterThanOrEqualToPredicateOperatorType) {
limits = @[leftCondition.leftExpression, rightCondition.leftExpression];
leftConditionExpression = leftCondition.rightExpression;
} else if(leftCondition.predicateOperatorType == NSGreaterThanOrEqualToPredicateOperatorType &&
rightCondition.predicateOperatorType == NSGreaterThanOrEqualToPredicateOperatorType) {
limits = @[leftCondition.rightExpression, rightCondition.leftExpression];
leftConditionExpression = leftCondition.leftExpression;
}
if (limits && leftConditionExpression) {
return [NSPredicate predicateWithFormat:@"%@ BETWEEN %@", leftConditionExpression, [NSExpression expressionForAggregate:limits]];
}
}
}
return [NSCompoundPredicate andPredicateWithSubpredicates:subpredicates];
}
if ([op isEqualToString:@"any"]) {
NSArray *subpredicates = MGLSubpredicatesWithJSONObjects([objects subarrayWithRange:NSMakeRange(1, objects.count - 1)]);
return [NSCompoundPredicate orPredicateWithSubpredicates:subpredicates];
}
NSExpression *expression = [NSExpression expressionWithMGLJSONObject:object];
return [NSComparisonPredicate predicateWithLeftExpression:expression
rightExpression:[NSExpression expressionForConstantValue:@YES]
modifier:NSDirectPredicateModifier
type:NSEqualToPredicateOperatorType
options:0];
}
- (id)mgl_jsonExpressionObject {
if ([self isEqual:[NSPredicate predicateWithValue:YES]]) {
return @YES;
}
if ([self isEqual:[NSPredicate predicateWithValue:NO]]) {
return @NO;
}
if ([self.predicateFormat hasPrefix:@"BLOCKPREDICATE("]) {
[NSException raise:NSInvalidArgumentException
format:@"Block-based predicates are not supported."];
}
[NSException raise:NSInvalidArgumentException
format:@"Unrecognized predicate type."];
return nil;
}
@end
@implementation NSPredicate (MGLExpressionAdditions)
- (id)mgl_if:(id)firstValue, ... {
if ([self evaluateWithObject:nil]) {
return firstValue;
}
id eachExpression;
va_list argumentList;
va_start(argumentList, firstValue);
while ((eachExpression = va_arg(argumentList, id))) {
if ([eachExpression isKindOfClass:[NSComparisonPredicate class]]) {
id valueExpression = va_arg(argumentList, id);
if ([eachExpression evaluateWithObject:nil]) {
return valueExpression;
}
} else {
return eachExpression;
}
}
va_end(argumentList);
return nil;
}
- (id)mgl_match:(NSExpression *)firstCase, ... {
[NSException raise:NSInvalidArgumentException
format:@"Match expressions lack underlying Objective-C implementations."];
return nil;
}
@end
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