42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
#pragma once
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#include <mbgl/style/property_expression.hpp>
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#include <mbgl/style/conversion.hpp>
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#include <mbgl/style/conversion/constant.hpp>
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#include <mbgl/style/expression/expression.hpp>
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#include <mbgl/style/expression/value.hpp>
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namespace mbgl {
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namespace style {
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namespace conversion {
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bool hasTokens(const std::string&);
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std::unique_ptr<expression::Expression> convertTokenStringToExpression(const std::string&);
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optional<std::unique_ptr<expression::Expression>> convertFunctionToExpression(expression::type::Type, const Convertible&, Error&, bool convertTokens);
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template <class T>
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optional<PropertyExpression<T>> convertFunctionToExpression(const Convertible& value, Error& error, bool convertTokens) {
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auto expression = convertFunctionToExpression(expression::valueTypeToExpressionType<T>(), value, error, convertTokens);
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if (!expression) {
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return nullopt;
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}
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optional<T> defaultValue;
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auto defaultValueValue = objectMember(value, "default");
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if (defaultValueValue) {
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defaultValue = convert<T>(*defaultValueValue, error);
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if (!defaultValue) {
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error.message = R"(wrong type for "default": )" + error.message;
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return nullopt;
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}
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}
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return PropertyExpression<T>(std::move(*expression), defaultValue);
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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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