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#pragma once
#include <mbgl/style/conversion.hpp>
#include <mbgl/util/optional.hpp>
#include <mbgl/util/color.hpp>
#include <mbgl/util/enum.hpp>
#include <array>
#include <string>
#include <vector>
namespace mbgl {
namespace style {
namespace conversion {
template <>
struct Converter<bool> {
template <class V>
Result<bool> operator()(const V& value) const {
optional<bool> converted = toBool(value);
if (!converted) {
return Error { "value must be a boolean" };
}
return *converted;
}
};
template <>
struct Converter<float> {
template <class V>
Result<float> operator()(const V& value) const {
optional<float> converted = toNumber(value);
if (!converted) {
return Error { "value must be a number" };
}
return *converted;
}
};
template <>
struct Converter<std::string> {
template <class V>
Result<std::string> operator()(const V& value) const {
optional<std::string> converted = toString(value);
if (!converted) {
return Error { "value must be a string" };
}
return *converted;
}
};
template <class T>
struct Converter<T, typename std::enable_if_t<std::is_enum<T>::value>> {
template <class V>
Result<T> operator()(const V& value) const {
optional<std::string> string = toString(value);
if (!string) {
return Error { "value must be a string" };
}
const auto result = Enum<T>::toEnum(*string);
if (!result) {
return Error { "value must be a valid enumeration value" };
}
return *result;
}
};
template <>
struct Converter<Color> {
template <class V>
Result<Color> operator()(const V& value) const {
optional<std::string> string = toString(value);
if (!string) {
return Error { "value must be a string" };
}
optional<Color> color = Color::parse(*string);
if (!color) {
return Error { "value must be a valid color" };
}
return *color;
}
};
template <>
struct Converter<std::array<float, 2>> {
template <class V>
Result<std::array<float, 2>> operator()(const V& value) const {
if (!isArray(value) || arrayLength(value) != 2) {
return Error { "value must be an array of two numbers" };
}
optional<float> first = toNumber(arrayMember(value, 0));
optional<float> second = toNumber(arrayMember(value, 1));
if (!first || !second) {
return Error { "value must be an array of two numbers" };
}
return std::array<float, 2> {{ *first, *second }};
}
};
template <>
struct Converter<std::array<float, 4>> {
template <class V>
Result<std::array<float, 4>> operator()(const V& value) const {
if (!isArray(value) || arrayLength(value) != 4) {
return Error { "value must be an array of four numbers" };
}
optional<float> first = toNumber(arrayMember(value, 0));
optional<float> second = toNumber(arrayMember(value, 1));
optional<float> third = toNumber(arrayMember(value, 2));
optional<float> fourth = toNumber(arrayMember(value, 3));
if (!first || !second) {
return Error { "value must be an array of four numbers" };
}
return std::array<float, 4> {{ *first, *second, *third, *fourth }};
}
};
template <>
struct Converter<std::vector<float>> {
template <class V>
Result<std::vector<float>> operator()(const V& value) const {
if (!isArray(value)) {
return Error { "value must be an array" };
}
std::vector<float> result;
result.reserve(arrayLength(value));
for (std::size_t i = 0; i < arrayLength(value); ++i) {
optional<float> number = toNumber(arrayMember(value, i));
if (!number) {
return Error { "value must be an array of numbers" };
}
result.push_back(*number);
}
return result;
}
};
template <>
struct Converter<std::vector<std::string>> {
template <class V>
Result<std::vector<std::string>> operator()(const V& value) const {
if (!isArray(value)) {
return Error { "value must be an array" };
}
std::vector<std::string> result;
result.reserve(arrayLength(value));
for (std::size_t i = 0; i < arrayLength(value); ++i) {
optional<std::string> string = toString(arrayMember(value, i));
if (!string) {
return Error { "value must be an array of strings" };
}
result.push_back(*string);
}
return result;
}
};
} // namespace conversion
} // namespace style
} // namespace mbgl
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