86 lines
3.2 KiB
C++
86 lines
3.2 KiB
C++
#pragma once
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#include <mbgl/style/data_driven_property_value.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/conversion/function.hpp>
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#include <mbgl/style/conversion/expression.hpp>
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#include <mbgl/style/expression/is_expression.hpp>
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#include <mbgl/style/expression/is_constant.hpp>
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#include <mbgl/style/expression/find_zoom_curve.hpp>
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#include <mbgl/style/expression/literal.hpp>
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#include <mbgl/style/expression/value.hpp>
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#include <unordered_set>
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namespace mbgl {
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namespace style {
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namespace conversion {
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template <class T>
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struct Converter<DataDrivenPropertyValue<T>> {
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optional<DataDrivenPropertyValue<T>> operator()(const Convertible& value, Error& error) const {
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if (isUndefined(value)) {
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return DataDrivenPropertyValue<T>();
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} else if (expression::isExpression(value)) {
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optional<std::unique_ptr<Expression>> expression = convert<std::unique_ptr<Expression>>(
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value,
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error,
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valueTypeToExpressionType<T>());
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if (!expression) {
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return {};
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}
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bool featureConstant = isFeatureConstant(**expression);
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bool zoomConstant = isZoomConstant(**expression);
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if (featureConstant && !zoomConstant) {
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return DataDrivenPropertyValue<T>(CameraFunction<T>(std::move(*expression)));
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} else if (!featureConstant && zoomConstant) {
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return DataDrivenPropertyValue<T>(SourceFunction<T>(std::move(*expression)));
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} else if (!featureConstant && !zoomConstant) {
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return DataDrivenPropertyValue<T>(CompositeFunction<T>(std::move(*expression)));
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} else {
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// If an expression is neither zoom- nor feature-dependent, it
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// should have been reduced to a Literal when it was parsed.
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auto literal = dynamic_cast<Literal*>(expression->get());
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assert(literal);
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optional<T> constant = fromExpressionValue<T>(literal->getValue());
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if (!constant) {
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return {};
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}
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return DataDrivenPropertyValue<T>(*constant);
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}
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} else if (!isObject(value)) {
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optional<T> constant = convert<T>(value, error);
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if (!constant) {
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return {};
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}
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return DataDrivenPropertyValue<T>(*constant);
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} else if (!objectMember(value, "property")) {
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optional<CameraFunction<T>> function = convert<CameraFunction<T>>(value, error);
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if (!function) {
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return {};
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}
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return DataDrivenPropertyValue<T>(*function);
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} else {
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optional<CompositeFunction<T>> composite = convert<CompositeFunction<T>>(value, error);
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if (composite) {
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return DataDrivenPropertyValue<T>(*composite);
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}
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optional<SourceFunction<T>> source = convert<SourceFunction<T>>(value, error);
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if (!source) {
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return {};
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}
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return DataDrivenPropertyValue<T>(*source);
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}
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}
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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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