39 lines
1.1 KiB
C++
39 lines
1.1 KiB
C++
#pragma once
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#include <mbgl/style/expression/expression.hpp>
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#include <mbgl/style/expression/compound_expression.hpp>
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namespace mbgl {
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namespace style {
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namespace expression {
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template <typename T>
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bool isGlobalPropertyConstant(const Expression& expression, const T& properties) {
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if (expression.getKind() == Kind::CompoundExpression) {
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auto e = static_cast<const CompoundExpression*>(&expression);
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for (const std::string& property : properties) {
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if (e->getOperator() == property) {
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return false;
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}
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}
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}
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bool isConstant = true;
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expression.eachChild([&](const Expression& e) {
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if (isConstant && !isGlobalPropertyConstant(e, properties)) {
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isConstant = false;
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}
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});
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return isConstant;
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}
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bool isFeatureConstant(const Expression& expression);
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bool isZoomConstant(const Expression& e);
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/// Returns true if expression does not depend on information provided by the runtime.
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bool isRuntimeConstant(const Expression& e);
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} // namespace expression
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} // namespace style
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} // namespace mbgl
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