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#pragma once
#include <mbgl/style/expression/collator.hpp>
#include <mbgl/style/expression/formatted.hpp>
#include <mbgl/style/expression/type.hpp>
#include <mbgl/style/position.hpp>
#include <mbgl/style/types.hpp>
#include <mbgl/util/color.hpp>
#include <mbgl/util/enum.hpp>
#include <mbgl/util/feature.hpp>
#include <mbgl/util/variant.hpp>
#include <array>
#include <vector>
namespace mbgl {
namespace style {
namespace expression {
struct Value;
using ValueBase = variant<
NullValue,
bool,
double,
std::string,
Color,
Collator,
Formatted,
mapbox::util::recursive_wrapper<std::vector<Value>>,
mapbox::util::recursive_wrapper<std::unordered_map<std::string, Value>>>;
struct Value : ValueBase {
using ValueBase::ValueBase;
// Javascript's Number.MAX_SAFE_INTEGER
static uint64_t maxSafeInteger() { return 9007199254740991ULL; }
static bool isSafeInteger(uint64_t x) { return x <= maxSafeInteger(); };
static bool isSafeInteger(int64_t x) {
return static_cast<uint64_t>(x > 0 ? x : -x) <= maxSafeInteger();
}
static bool isSafeInteger(double x) {
return static_cast<uint64_t>(x > 0 ? x : -x) <= maxSafeInteger();
}
};
constexpr NullValue Null = NullValue();
type::Type typeOf(const Value& value);
std::string toString(const Value& value);
std::string stringify(const Value& value);
/*
Returns a Type object representing the expression type that corresponds to
the value type T. (Specialized for primitives and specific array types in
the .cpp.)
*/
template <typename T>
type::Type valueTypeToExpressionType();
/*
Conversions between style value types and expression::Value
*/
template <class T, class Enable = void>
struct ValueConverter {
static Value toExpressionValue(const T& value) {
return Value(value);
}
static optional<T> fromExpressionValue(const Value& value) {
return value.template is<T>() ? value.template get<T>() : optional<T>();
}
};
template <>
struct ValueConverter<Value> {
static type::Type expressionType() { return type::Value; }
static Value toExpressionValue(const Value& value) { return value; }
static optional<Value> fromExpressionValue(const Value& value) { return value; }
};
template <>
struct ValueConverter<mbgl::Value> {
static Value toExpressionValue(const mbgl::Value& value);
static mbgl::Value fromExpressionValue(const Value& value);
};
template <>
struct ValueConverter<float> {
static type::Type expressionType() { return type::Number; }
static Value toExpressionValue(const float value);
static optional<float> fromExpressionValue(const Value& value);
};
template <typename T, std::size_t N>
struct ValueConverter<std::array<T, N>> {
static type::Type expressionType() {
return type::Array(valueTypeToExpressionType<T>(), N);
}
static Value toExpressionValue(const std::array<T, N>& value);
static optional<std::array<T, N>> fromExpressionValue(const Value& value);
};
template <typename T>
struct ValueConverter<std::vector<T>> {
static type::Type expressionType() {
return type::Array(valueTypeToExpressionType<T>());
}
static Value toExpressionValue(const std::vector<T>& value);
static optional<std::vector<T>> fromExpressionValue(const Value& value);
};
template <>
struct ValueConverter<Position> {
static type::Type expressionType() { return type::Array(type::Number, 3); }
static Value toExpressionValue(const mbgl::style::Position& value);
static optional<Position> fromExpressionValue(const Value& v);
};
template <typename T>
struct ValueConverter<T, std::enable_if_t< std::is_enum<T>::value >> {
static type::Type expressionType() { return type::String; }
static Value toExpressionValue(const T& value);
static optional<T> fromExpressionValue(const Value& value);
};
template <typename T>
Value toExpressionValue(const T& value) {
return ValueConverter<T>::toExpressionValue(value);
}
template <typename T>
optional<T> fromExpressionValue(const Value& value) {
return ValueConverter<T>::fromExpressionValue(value);
}
template <typename T>
std::vector<optional<T>> fromExpressionValues(const std::vector<optional<Value>>& values) {
std::vector<optional<T>> result;
for (const auto& value : values) {
result.push_back(value ? fromExpressionValue<T>(*value) : nullopt);
}
return result;
}
} // namespace expression
} // namespace style
} // namespace mbgl
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