89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
#pragma once
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#include <mbgl/style/conversion.hpp>
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#include <mbgl/util/color.hpp>
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#include <mbgl/util/enum.hpp>
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#include <mbgl/util/string.hpp>
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#include <array>
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#include <string>
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#include <vector>
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namespace mbgl {
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namespace style {
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namespace conversion {
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template <>
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struct Converter<bool> {
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optional<bool> operator()(const Convertible& value, Error& error) const;
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};
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template <>
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struct Converter<float> {
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optional<float> operator()(const Convertible& value, Error& error) const;
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};
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template <>
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struct Converter<std::string> {
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optional<std::string> operator()(const Convertible& value, Error& error) const;
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};
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template <class T>
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struct Converter<T, typename std::enable_if_t<std::is_enum<T>::value>> {
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optional<T> operator()(const Convertible& value, Error& error) const {
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optional<std::string> string = toString(value);
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if (!string) {
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error = { "value must be a string" };
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return {};
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}
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const auto result = Enum<T>::toEnum(*string);
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if (!result) {
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error = { "value must be a valid enumeration value" };
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return {};
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}
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return *result;
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}
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};
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template <>
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struct Converter<Color> {
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optional<Color> operator()(const Convertible& value, Error& error) const;
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};
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template <size_t N>
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struct Converter<std::array<float, N>> {
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optional<std::array<float, N>> operator()(const Convertible& value, Error& error) const {
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if (!isArray(value) || arrayLength(value) != N) {
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error = { "value must be an array of " + util::toString(N) + " numbers" };
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return {};
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}
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std::array<float, N> result;
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for (size_t i = 0; i < N; i++) {
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optional<float> n = toNumber(arrayMember(value, i));
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if (!n) {
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error = { "value must be an array of " + util::toString(N) + " numbers" };
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return {};
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}
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result[i] = *n;
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}
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return result;
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}
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};
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template <>
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struct Converter<std::vector<float>> {
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optional<std::vector<float>> operator()(const Convertible& value, Error& error) const;
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};
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template <>
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struct Converter<std::vector<std::string>> {
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optional<std::vector<std::string>> operator()(const Convertible& value, Error& error) const;
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};
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} // namespace conversion
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} // namespace style
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} // namespace mbgl
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