1 #pragma once
2 
3 #include <mbgl/style/expression/expression.hpp>
4 #include <mbgl/style/expression/compound_expression.hpp>
5 
6 namespace mbgl {
7 namespace style {
8 namespace expression {
9 
10 template <typename T>
isGlobalPropertyConstant(const Expression & expression,const T & properties)11 bool isGlobalPropertyConstant(const Expression& expression, const T& properties) {
12     if (expression.getKind() == Kind::CompoundExpression) {
13         auto e = static_cast<const CompoundExpressionBase*>(&expression);
14         for (const std::string& property : properties) {
15             if (e->getName() == property) {
16                 return false;
17             }
18         }
19     }
20 
21     bool isConstant = true;
22     expression.eachChild([&](const Expression& e) {
23         if (isConstant && !isGlobalPropertyConstant(e, properties)) {
24             isConstant = false;
25         }
26     });
27     return isConstant;
28 };
29 
30 bool isFeatureConstant(const Expression& expression);
31 bool isZoomConstant(const Expression& e);
32 
33 
34 } // namespace expression
35 } // namespace style
36 } // namespace mbgl
37