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#include <mbgl/style/property_value.hpp>
#include <mbgl/style/layer.hpp>
#include <mbgl/util/optional.hpp>
#include <mbgl/util/enum.hpp>
namespace node_mbgl {
template <class V, class Enable = void>
struct ValueConverter {};
template <>
struct ValueConverter<bool> {
mbgl::optional<mbgl::style::PropertyValue<bool>> operator()(const v8::Local<v8::Value>& value) const {
if (!value->IsBoolean()) {
Nan::ThrowTypeError("boolean required");
return {};
}
return { value->BooleanValue() };
}
};
template <>
struct ValueConverter<float> {
mbgl::optional<mbgl::style::PropertyValue<float>> operator()(const v8::Local<v8::Value>& value) const {
if (!value->IsNumber()) {
Nan::ThrowTypeError("number required");
return {};
}
return { value->NumberValue() };
}
};
template <>
struct ValueConverter<std::string> {
mbgl::optional<mbgl::style::PropertyValue<std::string>> operator()(const v8::Local<v8::Value>& value) const {
if (!value->IsString()) {
Nan::ThrowTypeError("string required");
return {};
}
return { std::string(*Nan::Utf8String(value)) };
}
};
template <typename T>
struct ValueConverter<T, std::enable_if_t<std::is_enum<T>::value>> {
mbgl::optional<mbgl::style::PropertyValue<T>> operator()(const v8::Local<v8::Value>& value) const {
if (!value->IsString()) {
Nan::ThrowTypeError("string required");
return {};
}
mbgl::optional<T> result = mbgl::Enum<T>::toEnum(*Nan::Utf8String(value));
if (!result) {
Nan::ThrowTypeError("invalid enumeration value");
return {};
}
return { *result };
}
};
template <>
struct ValueConverter<mbgl::Color> {
mbgl::optional<mbgl::style::PropertyValue<mbgl::Color>> operator()(const v8::Local<v8::Value>& value) const {
(void)value;
return {};
}
};
template <>
struct ValueConverter<std::array<float, 2>> {
mbgl::optional<mbgl::style::PropertyValue<std::array<float, 2>>> operator()(const v8::Local<v8::Value>& value) const {
(void)value;
return {};
}
};
template <>
struct ValueConverter<std::vector<float>> {
mbgl::optional<mbgl::style::PropertyValue<std::vector<float>>> operator()(const v8::Local<v8::Value>& value) const {
(void)value;
return {};
}
};
template <>
struct ValueConverter<std::vector<std::string>> {
mbgl::optional<mbgl::style::PropertyValue<std::vector<std::string>>> operator()(const v8::Local<v8::Value>& value) const {
(void)value;
return {};
}
};
using PropertySetter = std::function<bool (mbgl::style::Layer&, const v8::Local<v8::Value>&)>;
using PropertySetters = std::unordered_map<std::string, PropertySetter>;
template <class L, class V>
PropertySetter makePropertySetter(void (L::*setter)(mbgl::style::PropertyValue<V>)) {
return [setter] (mbgl::style::Layer& layer, const v8::Local<v8::Value>& value) {
L* typedLayer = layer.as<L>();
if (!typedLayer) {
Nan::ThrowTypeError("layer doesn't support this property");
return false;
}
mbgl::optional<mbgl::style::PropertyValue<V>> typedValue;
if (value->IsNull() || value->IsUndefined()) {
typedValue = mbgl::style::PropertyValue<V>();
} else {
typedValue = ValueConverter<V>()(value);
}
if (!typedValue) {
return false;
}
(typedLayer->*setter)(*typedValue);
return true;
};
}
}
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