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#import <Foundation/Foundation.h>
#import "MGLStyleValue.h"
#import "NSValue+MGLStyleAttributeAdditions.h"
#import "MGLTypes.h"
#if TARGET_OS_IPHONE
#import "UIColor+MGLAdditions.h"
#else
#import "NSColor+MGLAdditions.h"
#endif
#include <array>
template <typename MBGLType, typename ObjCType, typename MBGLElement = MBGLType>
class MGLStyleValueTransformer {
public:
MGLStyleValue<ObjCType> *toStyleValue(const mbgl::style::PropertyValue<MBGLType> &mbglValue) {
if (mbglValue.isConstant()) {
return toStyleConstantValue(mbglValue.asConstant());
} else if (mbglValue.isFunction()) {
return toStyleFunction(mbglValue.asFunction());
} else {
return nil;
}
}
mbgl::style::PropertyValue<MBGLType> toPropertyValue(MGLStyleValue<ObjCType> *value) {
if ([value isKindOfClass:[MGLStyleConstantValue class]]) {
MBGLType mbglValue;
getMBGLValue([(MGLStyleConstantValue<ObjCType> *)value rawValue], mbglValue);
return mbglValue;
} else if ([value isKindOfClass:[MGLStyleFunction class]]) {
MGLStyleFunction<ObjCType> *function = (MGLStyleFunction<ObjCType> *)value;
__block std::vector<std::pair<float, MBGLType>> mbglStops;
[function.stops enumerateKeysAndObjectsUsingBlock:^(NSNumber * _Nonnull zoomKey, MGLStyleValue<ObjCType> * _Nonnull stopValue, BOOL * _Nonnull stop) {
NSCAssert([stopValue isKindOfClass:[MGLStyleValue class]], @"Stops should be MGLStyleValues");
auto mbglStopValue = toPropertyValue(stopValue);
NSCAssert(mbglStopValue.isConstant(), @"Stops must be constant");
mbglStops.emplace_back(zoomKey.floatValue, mbglStopValue.asConstant());
}];
return mbgl::style::Function<MBGLType>({{mbglStops}}, function.base);
} else if (value) {
[NSException raise:@"MGLAbstractClassException" format:
@"The style value %@ cannot be applied to the style. "
@"Make sure the style value was created as a member of a concrete subclass of MGLStyleValue.",
NSStringFromClass([value class])];
return {};
} else {
return {};
}
}
private:
MGLStyleConstantValue<ObjCType> *toStyleConstantValue(const MBGLType mbglValue) {
auto rawValue = toMGLRawStyleValue(mbglValue);
return [MGLStyleConstantValue<ObjCType> valueWithRawValue:rawValue];
}
MGLStyleFunction<ObjCType> *toStyleFunction(const mbgl::style::Function<MBGLType> &mbglFunction) {
const auto &mbglStops = mbglFunction.getStops();
NSMutableDictionary *stops = [NSMutableDictionary dictionaryWithCapacity:mbglStops.size()];
for (const auto &mbglStop : mbglStops) {
auto rawValue = toMGLRawStyleValue(mbglStop.second);
stops[@(mbglStop.first)] = [MGLStyleValue valueWithRawValue:rawValue];
}
return [MGLStyleFunction<ObjCType> functionWithBase:mbglFunction.getBase() stops:stops];
}
NSNumber *toMGLRawStyleValue(const bool mbglStopValue) {
return @(mbglStopValue);
}
NSNumber *toMGLRawStyleValue(const float mbglStopValue) {
return @(mbglStopValue);
}
NSString *toMGLRawStyleValue(const std::string &mbglStopValue) {
return @(mbglStopValue.c_str());
}
// Offsets
NSValue *toMGLRawStyleValue(const std::array<float, 2> &mbglStopValue) {
return [NSValue mgl_valueWithOffsetArray:mbglStopValue];
}
// Padding
NSValue *toMGLRawStyleValue(const std::array<float, 4> &mbglStopValue) {
return [NSValue mgl_valueWithPaddingArray:mbglStopValue];
}
// Enumerations
template <typename MBGLEnum = MBGLType, class = typename std::enable_if<std::is_enum<MBGLEnum>::value>::type>
ObjCType toMGLRawStyleValue(const MBGLType &mbglStopValue) {
NSUInteger rawValue = static_cast<NSUInteger>(mbglStopValue);
return [NSValue value:&rawValue withObjCType:@encode(NSUInteger)];
}
MGLColor *toMGLRawStyleValue(const mbgl::Color mbglStopValue) {
return [MGLColor mgl_colorWithColor:mbglStopValue];
}
ObjCType toMGLRawStyleValue(const std::vector<MBGLElement> &mbglStopValue) {
NSMutableArray *array = [NSMutableArray arrayWithCapacity:mbglStopValue.size()];
for (const auto &mbglElement: mbglStopValue) {
[array addObject:toMGLRawStyleValue(mbglElement)];
}
return array;
}
private:
void getMBGLValue(NSNumber *rawValue, bool &mbglValue) {
mbglValue = !!rawValue.boolValue;
}
void getMBGLValue(NSNumber *rawValue, float &mbglValue) {
mbglValue = rawValue.floatValue;
}
void getMBGLValue(NSString *rawValue, std::string &mbglValue) {
mbglValue = rawValue.UTF8String;
}
// Offsets
void getMBGLValue(NSValue *rawValue, std::array<float, 2> &mbglValue) {
mbglValue = rawValue.mgl_offsetArrayValue;
}
// Padding
void getMBGLValue(NSValue *rawValue, std::array<float, 4> &mbglValue) {
mbglValue = rawValue.mgl_paddingArrayValue;
}
// Enumerations
template <typename MBGLEnum = MBGLType, class = typename std::enable_if<std::is_enum<MBGLEnum>::value>::type>
void getMBGLValue(ObjCType rawValue, MBGLType &mbglValue) {
[rawValue getValue:&mbglValue];
}
void getMBGLValue(MGLColor *rawValue, mbgl::Color &mbglValue) {
mbglValue = rawValue.mgl_color;
}
void getMBGLValue(ObjCType rawValue, std::vector<MBGLElement> &mbglValue) {
mbglValue.reserve(rawValue.count);
for (id obj in rawValue) {
MBGLElement mbglElement;
getMBGLValue(obj, mbglElement);
mbglValue.push_back(mbglElement);
}
}
};
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