1 files changed, 119 insertions, 0 deletions
diff --git a/include/mbgl/style/style_parser.hpp b/include/mbgl/style/style_parser.hpp
new file mode 100644
index 0000000000..431e3af8db
--- /dev/null
+++ b/include/mbgl/style/style_parser.hpp
@@ -0,0 +1,119 @@
+#ifndef MBGL_STYLE_STYLE_PARSER
+#define MBGL_STYLE_STYLE_PARSER
+
+#include <rapidjson/document.h>
+#include <mbgl/style/style.hpp>
+#include <mbgl/style/style_source.hpp>
+#include <mbgl/style/filter_expression.hpp>
+#include <mbgl/style/class_properties.hpp>
+#include <mbgl/style/rasterize_properties.hpp>
+#include <mbgl/style/style_bucket.hpp>
+
+#include <unordered_map>
+#include <forward_list>
+#include <tuple>
+
+namespace mbgl {
+
+enum class ClassID : uint32_t;
+
+class StyleLayer;
+class StyleLayerGroup;
+
+class StyleParser {
+public:
+    using JSVal = const rapidjson::Value&;
+
+    StyleParser();
+
+    void parse(JSVal document);
+
+    std::shared_ptr<StyleLayerGroup> getLayers() {
+        return root;
+    }
+
+    std::string getSprite() const {
+        return sprite;
+    }
+
+    std::string getGlyphURL() const {
+        return glyph_url;
+    }
+
+private:
+    void parseConstants(JSVal value);
+    JSVal replaceConstant(JSVal value);
+
+    void parseSources(JSVal value);
+
+    std::unique_ptr<StyleLayerGroup> createLayers(JSVal value);
+    std::shared_ptr<StyleLayer> createLayer(JSVal value);
+    void parseLayers();
+    void parseLayer(std::pair<JSVal, std::shared_ptr<StyleLayer>> &pair);
+    void parseStyles(JSVal value, std::map<ClassID, ClassProperties> &styles);
+    void parseStyle(JSVal, ClassProperties &properties);
+    std::unique_ptr<RasterizeProperties> parseRasterize(JSVal value);
+    void parseReference(JSVal value, std::shared_ptr<StyleLayer> &layer);
+    void parseBucket(JSVal value, std::shared_ptr<StyleLayer> &layer);
+    void parseRender(JSVal value, std::shared_ptr<StyleLayer> &layer);
+    void parseSprite(JSVal value);
+    void parseGlyphURL(JSVal value);
+
+    // Parses optional properties into a render bucket.
+    template<typename T>
+    bool parseRenderProperty(JSVal value, T &target, const char *name);
+    template <typename T, typename Parser>
+    bool parseRenderProperty(JSVal value, T &target, const char *name, Parser &parser);
+
+    // Parses optional properties into style class properties.
+    template <typename T>
+    bool parseOptionalProperty(const char *property_name, PropertyKey key, ClassProperties &klass, JSVal value);
+    template <typename T>
+    bool parseOptionalProperty(const char *property_name, const std::vector<PropertyKey> &keys, ClassProperties &klass, JSVal value);
+    template <typename T>
+    bool parseOptionalProperty(const char *property_name, T &target, JSVal value);
+    template <typename T>
+    bool setProperty(JSVal value, const char *property_name, PropertyKey key, ClassProperties &klass);
+    template <typename T>
+    bool setProperty(JSVal value, const char *property_name, T &target);
+
+    template <typename T>
+    std::tuple<bool, T> parseProperty(JSVal value, const char *property_name);
+
+    template <typename T>
+    bool parseFunction(PropertyKey key, ClassProperties &klass, JSVal value);
+    template <typename T>
+    std::tuple<bool, Function<T>> parseFunction(JSVal value);
+    template <typename T>
+    T parseFunctionArgument(JSVal value);
+
+
+    FilterExpression parseFilter(JSVal, FilterExpression::Operator op);
+    FilterExpression parseFilter(JSVal);
+    Value parseValue(JSVal value);
+    std::vector<Value> parseValues(JSVal values);
+
+private:
+    std::unordered_map<std::string, const rapidjson::Value *> constants;
+
+    std::unordered_map<std::string, const std::shared_ptr<StyleSource>> sources;
+
+    // This stores the root layer.
+    std::shared_ptr<StyleLayerGroup> root;
+
+    // This maps ids to Layer objects, with all items being at the root level.
+    std::unordered_map<std::string, std::pair<JSVal, std::shared_ptr<StyleLayer>>> layers;
+
+    // Store a stack of layers we're parsing right now. This is to prevent reference cycles.
+    std::forward_list<StyleLayer *> stack;
+
+    // Base URL of the sprite image.
+    std::string sprite;
+
+    // URL template for glyph PBFs.
+    std::string glyph_url;
+};
+
+}
+
+#endif