Reading/Writing JSON, first working version

src/main/java/carpet/script/utils/ScarpetJsonDeserializer.java

@@ -0,0 +1,78 @@
+package carpet.script.utils;
+
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
+
+import carpet.script.value.ListValue;
+import carpet.script.value.MapValue;
+import carpet.script.value.NumericValue;
+import carpet.script.value.StringValue;
+import carpet.script.value.Value;
+
+public class ScarpetJsonDeserializer implements JsonDeserializer<Value>{
+
+	@Override
+	public Value deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
+			throws JsonParseException {
+		return parseElement(json);
+	}
+	
+	private Value parseElement(JsonElement element) throws JsonParseException {
+		if (element.isJsonObject())
+		{
+			return parseMap(element.getAsJsonObject());
+		}
+		else if (element.isJsonArray())
+		{
+			return parseList(element.getAsJsonArray());
+		}
+		else if (element.isJsonPrimitive())
+		{
+			return parsePrimitive(element.getAsJsonPrimitive());
+		}
+		return Value.NULL;
+	}
+
+	private Value parseMap(JsonObject jsonMap) throws JsonParseException {
+		Map<Value, Value> map = new HashMap<Value, Value>();
+		jsonMap.entrySet().forEach(entry -> {
+			map.put(new StringValue(entry.getKey()), parseElement(entry.getValue()));
+		});
+		return MapValue.wrap(map);
+	}
+
+	private Value parseList(JsonArray jsonList) throws JsonParseException {
+		List<Value> list = new ArrayList<Value>();
+		jsonList.forEach(elem -> {
+			list.add(parseElement(elem));
+		});
+		return new ListValue(list);
+	}
+	
+	private Value parsePrimitive(JsonPrimitive primitive) throws JsonParseException {
+		if (primitive.isString())
+		{
+			return new StringValue(primitive.getAsString());
+		}
+		else if (primitive.isBoolean())
+		{
+			return primitive.getAsBoolean() ? Value.TRUE : Value.FALSE;
+		}
+		else if (primitive.isNumber())
+		{
+			return NumericValue.of(primitive.getAsNumber());
+		}
+		return Value.NULL;
+	}
+}