1 files changed, 65 insertions, 0 deletions
diff --git a/include/mbgl/style/filter_comparison.hpp b/include/mbgl/style/filter_comparison.hpp
new file mode 100644
index 0000000000..bf48744f1e
--- /dev/null
+++ b/include/mbgl/style/filter_comparison.hpp
@@ -0,0 +1,65 @@
+#ifndef MBGL_STYLE_FILTER_COMPARISON
+#define MBGL_STYLE_FILTER_COMPARISON
+
+#include <mbgl/style/value.hpp>
+
+#include <vector>
+#include <string>
+#include <iosfwd>
+
+namespace mbgl {
+
+class FilterComparison {
+public:
+    enum class Operator : uint8_t {
+        Equal,
+        NotEqual,
+        Greater,
+        GreaterEqual,
+        Less,
+        LessEqual,
+        In,
+        NotIn
+    };
+
+    class Instance {
+    public:
+        Instance(Operator op, std::vector<Value> &&values)
+            : op(op), values(values) {}
+
+        bool compare(const std::vector<Value> &property_values) const;
+
+    private:
+        Operator op = Operator::Equal;
+        std::vector<Value> values;
+
+        friend std::ostream& operator <<(std::ostream &, const Instance &);
+    };
+
+public:
+    FilterComparison(const std::string &field) : field(field) {};
+
+    const std::string &getField() const;
+    template <typename Extractor> inline bool compare(const Extractor &extractor) const;
+
+    template <typename ...Args>
+    inline void add(Args&& ...args) {
+        instances.emplace_back(::std::forward<Args>(args)...);
+    }
+
+private:
+    std::string field;
+    std::vector<Instance> instances;
+
+    friend std::ostream& operator <<(std::ostream &, const FilterComparison &);
+};
+
+std::ostream& operator <<(std::ostream &s, const FilterComparison &comparison);
+std::ostream& operator <<(std::ostream &s, const FilterComparison::Instance &instance);
+
+
+FilterComparison::Operator parseFilterComparisonOperator(const std::string &op);
+
+}
+
+#endif