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#include <mbgl/style/property_expression.hpp>
namespace mbgl {
namespace style {
PropertyExpressionBase::PropertyExpressionBase(std::unique_ptr<expression::Expression> expression_)
: expression(std::move(expression_)),
zoomCurve(expression::findZoomCurveChecked(expression.get())) {
isZoomConstant_ = expression::isZoomConstant(*expression);
isFeatureConstant_ = expression::isFeatureConstant(*expression);
}
bool PropertyExpressionBase::isZoomConstant() const noexcept {
return isZoomConstant_;
}
bool PropertyExpressionBase::isFeatureConstant() const noexcept {
return isFeatureConstant_;
}
bool PropertyExpressionBase::canEvaluateWith(const expression::EvaluationContext& context) const noexcept {
if (context.zoom) {
if (context.feature != nullptr) {
return !isFeatureConstant();
}
return !isZoomConstant() && isFeatureConstant();
}
if (context.feature != nullptr) {
return isZoomConstant() && !isFeatureConstant();
}
return true;
}
float PropertyExpressionBase::interpolationFactor(const Range<float>& inputLevels, const float inputValue) const noexcept {
return zoomCurve.match(
[](std::nullptr_t) {
assert(false);
return 0.0f;
},
[&](const expression::Interpolate* z) {
return z->interpolationFactor(Range<double> { inputLevels.min, inputLevels.max }, inputValue);
},
[](const expression::Step*) {
return 0.0f;
}
);
}
Range<float> PropertyExpressionBase::getCoveringStops(const float lower, const float upper) const noexcept {
return zoomCurve.match(
[](std::nullptr_t) {
assert(false);
return Range<float>(0.0f, 0.0f);
},
[&](auto z) {
return z->getCoveringStops(lower, upper);
}
);
}
const expression::Expression& PropertyExpressionBase::getExpression() const noexcept {
return *expression;
}
} // namespace style
} // namespace mbgl
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