1 files changed, 125 insertions, 0 deletions
diff --git a/src/mbgl/style/filter_expression.hpp b/src/mbgl/style/filter_expression.hpp
new file mode 100644
index 0000000000..8c6f447770
--- /dev/null
+++ b/src/mbgl/style/filter_expression.hpp
@@ -0,0 +1,125 @@
+#ifndef MBGL_STYLE_FILTER_EXPRESSION
+#define MBGL_STYLE_FILTER_EXPRESSION
+
+#include <mbgl/style/value.hpp>
+
+#include <rapidjson/document.h>
+
+#include <string>
+#include <vector>
+
+namespace mbgl {
+
+typedef mapbox::util::variant<
+    struct NullExpression,
+    struct EqualsExpression,
+    struct NotEqualsExpression,
+    struct LessThanExpression,
+    struct LessThanEqualsExpression,
+    struct GreaterThanExpression,
+    struct GreaterThanEqualsExpression,
+    struct InExpression,
+    struct NotInExpression,
+    struct AnyExpression,
+    struct AllExpression,
+    struct NoneExpression
+    > FilterExpression;
+
+FilterExpression parseFilterExpression(const rapidjson::Value&);
+
+template <class Extractor>
+bool evaluate(const FilterExpression&, const Extractor&);
+
+struct NullExpression {
+    template <class Extractor>
+    bool evaluate(const Extractor&) const { return true; }
+};
+
+struct EqualsExpression {
+    std::string key;
+    Value value;
+
+    template <class Extractor>
+    bool evaluate(const Extractor&) const;
+};
+
+struct NotEqualsExpression {
+    std::string key;
+    Value value;
+
+    template <class Extractor>
+    bool evaluate(const Extractor&) const;
+};
+
+struct LessThanExpression {
+    std::string key;
+    Value value;
+
+    template <class Extractor>
+    bool evaluate(const Extractor&) const;
+};
+
+struct LessThanEqualsExpression {
+    std::string key;
+    Value value;
+
+    template <class Extractor>
+    bool evaluate(const Extractor&) const;
+};
+
+struct GreaterThanExpression {
+    std::string key;
+    Value value;
+
+    template <class Extractor>
+    bool evaluate(const Extractor&) const;
+};
+
+struct GreaterThanEqualsExpression {
+    std::string key;
+    Value value;
+
+    template <class Extractor>
+    bool evaluate(const Extractor&) const;
+};
+
+struct InExpression {
+    std::string key;
+    std::vector<Value> values;
+
+    template <class Extractor>
+    bool evaluate(const Extractor&) const;
+};
+
+struct NotInExpression {
+    std::string key;
+    std::vector<Value> values;
+
+    template <class Extractor>
+    bool evaluate(const Extractor&) const;
+};
+
+struct AnyExpression {
+    std::vector<FilterExpression> expressions;
+
+    template <class Extractor>
+    bool evaluate(const Extractor&) const;
+};
+
+struct AllExpression {
+    std::vector<FilterExpression> expressions;
+
+    template <class Extractor>
+    bool evaluate(const Extractor&) const;
+};
+
+struct NoneExpression {
+    std::vector<FilterExpression> expressions;
+
+    template <class Extractor>
+    bool evaluate(const Extractor&) const;
+};
+
+}
+
+#endif