[libgdx] Updated JsonRollback tool to go from 3.8 JSON to 3.7.

spine-libgdx/spine-skeletonviewer/src/com/esotericsoftware/spine/JsonRollback.java

@@ -33,10 +33,12 @@ import com.badlogic.gdx.files.FileHandle;
 import com.badlogic.gdx.utils.Array;
 import com.badlogic.gdx.utils.Json;
 import com.badlogic.gdx.utils.JsonValue;
+import com.badlogic.gdx.utils.JsonValue.ValueType;
 import com.badlogic.gdx.utils.JsonWriter.OutputType;
 
-/** Takes Spine JSON data and transforms it to work with an older version of Spine. It supports going from version 3.3.xx to
- * 2.1.27.
+/** Takes Spine JSON data and transforms it to work with an older version of Spine. Target versions:<br>
+ * 2.1: supports going from version 3.3.xx to 2.1.27.<br>
+ * 3.7: supports going from version 3.8.xx to 3.7.94.
  * <p>
  * Data can be exported from a Spine project, processed with JsonRollback, then imported into an older version of Spine. However,
  * JsonRollback may remove data for features not supported by the older Spine version. Because of this, JsonRollback is only
@@ -47,67 +49,109 @@ import com.badlogic.gdx.utils.JsonWriter.OutputType;
  * the runtime is updated to support a newer Spine version should animators update their Spine editor version to match. */
 public class JsonRollback {
 	static public void main (String[] args) throws Exception {
-		if (args.length == 0) {
-			System.out.println("Usage: <inputFile> [outputFile]");
+		if (args.length != 2 && args.length != 3) {
+			System.out.println("Usage: <inputFile> <targetVersion> [outputFile]");
+			System.exit(0);
+		}
+
+		String version = args[1];
+		if (!version.equals("2.1") && !version.equals("3.7")) {
+			System.out.println("ERROR: Target version must be: 2.1 or 3.7");
+			System.out.println("Usage: <inputFile> <toVersion> [outputFile]");
 			System.exit(0);
 		}
 
 		JsonValue root = new Json().fromJson(null, new FileHandle(args[0]));
 
-		// In 3.2 skinnedmesh was renamed to weightedmesh.
-		setValue(root, "skinnedmesh", "skins", "*", "*", "*", "type", "weightedmesh");
+		if (version.equals("2.1")) {
+			// In 3.2 skinnedmesh was renamed to weightedmesh.
+			setValue(root, "skinnedmesh", "skins", "*", "*", "*", "type", "weightedmesh");
 
-		// In 3.2 shear was added.
-		delete(root, "animations", "*", "bones", "*", "shear");
+			// In 3.2 shear was added.
+			delete(root, "animations", "*", "bones", "*", "shear");
 
-		// In 3.3 ffd was renamed to deform.
-		rename(root, "ffd", "animations", "*", "deform");
+			// In 3.3 ffd was renamed to deform.
+			rename(root, "ffd", "animations", "*", "deform");
 
-		// In 3.3 mesh is now a single type, previously they were skinnedmesh if they had weights.
-		for (JsonValue value : find(root, new Array<JsonValue>(), 0, "skins", "*", "*", "*", "type", "mesh"))
-			if (value.parent.get("uvs").size != value.parent.get("vertices").size) value.set("skinnedmesh");
+			// In 3.3 mesh is now a single type, previously they were skinnedmesh if they had weights.
+			for (JsonValue value : find(root, new Array<JsonValue>(), 0, "skins", "*", "*", "*", "type", "mesh"))
+				if (value.parent.get("uvs").size != value.parent.get("vertices").size) value.set("skinnedmesh");
 
-		// In 3.3 linkedmesh is now a single type, previously they were linkedweightedmesh if they had weights.
-		for (JsonValue value : find(root, new Array<JsonValue>(), 0, "skins", "*", "*", "*", "type", "linkedmesh")) {
-			String slot = value.parent.parent.name.replaceAll("", "");
-			String skinName = value.parent.getString("skin", "default");
-			String parentName = value.parent.getString("parent");
-			if (find(root, new Array<JsonValue>(), 0,
-				("skins~~" + skinName + "~~" + slot + "~~" + parentName + "~~type~~skinnedmesh").split("~~")).size > 0)
-				value.set("weightedlinkedmesh");
-		}
+			// In 3.3 linkedmesh is now a single type, previously they were linkedweightedmesh if they had weights.
+			for (JsonValue value : find(root, new Array<JsonValue>(), 0, "skins", "*", "*", "*", "type", "linkedmesh")) {
+				String slot = value.parent.parent.name.replaceAll("", "");
+				String skinName = value.parent.getString("skin", "default");
+				String parentName = value.parent.getString("parent");
+				if (find(root, new Array<JsonValue>(), 0,
+					("skins~~" + skinName + "~~" + slot + "~~" + parentName + "~~type~~skinnedmesh").split("~~")).size > 0)
+					value.set("weightedlinkedmesh");
+			}
 
-		// In 3.3 bounding boxes can be weighted.
-		for (JsonValue value : find(root, new Array<JsonValue>(), 0, "skins", "*", "*", "*", "type", "boundingbox"))
-			if (value.parent.getInt("vertexCount") * 2 != value.parent.get("vertices").size)
-				value.parent.parent.remove(value.parent.name);
-
-		// In 3.3 paths were added.
-		for (JsonValue value : find(root, new Array<JsonValue>(), 0, "skins", "*", "*", "*", "type", "path")) {
-			String attachment = value.parent.name;
-			value.parent.parent.remove(attachment);
-			String slot = value.parent.parent.name;
-			// Also remove path deform timelines.
-			delete(root, "animations", "*", "ffd", "*", slot, attachment);
-		}
+			// In 3.3 bounding boxes can be weighted.
+			for (JsonValue value : find(root, new Array<JsonValue>(), 0, "skins", "*", "*", "*", "type", "boundingbox"))
+				if (value.parent.getInt("vertexCount") * 2 != value.parent.get("vertices").size)
+					value.parent.parent.remove(value.parent.name);
+
+			// In 3.3 paths were added.
+			for (JsonValue value : find(root, new Array<JsonValue>(), 0, "skins", "*", "*", "*", "type", "path")) {
+				String attachment = value.parent.name;
+				value.parent.parent.remove(attachment);
+				String slot = value.parent.parent.name;
+				// Also remove path deform timelines.
+				delete(root, "animations", "*", "ffd", "*", slot, attachment);
+			}
 
-		// In 3.3 IK constraint timelines no longer require bendPositive.
-		for (JsonValue value : find(root, new Array<JsonValue>(), 0, "animations", "*", "ik", "*"))
-			for (JsonValue child = value.child; child != null; child = child.next)
-				if (!child.has("bendPositive")) child.addChild("bendPositive", new JsonValue(true));
+			// In 3.3 IK constraint timelines no longer require bendPositive.
+			for (JsonValue value : find(root, new Array<JsonValue>(), 0, "animations", "*", "ik", "*"))
+				for (JsonValue child = value.child; child != null; child = child.next)
+					if (!child.has("bendPositive")) child.addChild("bendPositive", new JsonValue(true));
 
-		// In 3.3 transform constraints can have more than 1 bone.
-		for (JsonValue child = root.getChild("transform"); child != null; child = child.next) {
-			JsonValue bones = child.remove("bones");
-			if (bones != null) child.addChild("bone", new JsonValue(bones.child.asString()));
+			// In 3.3 transform constraints can have more than 1 bone.
+			for (JsonValue child = root.getChild("transform"); child != null; child = child.next) {
+				JsonValue bones = child.remove("bones");
+				if (bones != null) child.addChild("bone", new JsonValue(bones.child.asString()));
+			}
+		} else if (version.equals("3.7")) {
+			JsonValue skins = root.get("skins");
+			if (skins != null && skins.isArray()) {
+				JsonValue newSkins = new JsonValue(ValueType.object);
+				for (JsonValue skinMap = skins.child; skinMap != null; skinMap = skinMap.next) {
+					JsonValue newSkin = skinMap.get("attachments");
+					newSkins.addChild(skinMap.getString("name"), newSkin);
+				}
+				root.remove("skins");
+				root.addChild("skins", newSkins);
+			}
+
+			rollbackCurves(root.get("animations"));
 		}
 
-		if (args.length > 1)
-			new FileHandle(args[1]).writeString(root.prettyPrint(OutputType.json, 130), false, "UTF-8");
+		if (args.length == 3)
+			new FileHandle(args[2]).writeString(root.prettyPrint(OutputType.json, 130), false, "UTF-8");
 		else
 			System.out.println(root.prettyPrint(OutputType.json, 130));
 	}
 
+	static private void rollbackCurves (JsonValue map) {
+		if (map == null) return;
+		JsonValue curve = map.get("curve");
+		if (curve == null) {
+			for (map = map.child; map != null; map = map.next)
+				rollbackCurves(map);
+			return;
+		}
+		if (curve.isNumber()) {
+			curve.addChild(new JsonValue(curve.asFloat()));
+			curve.setType(ValueType.array);
+			curve.addChild(new JsonValue(map.getFloat("c2", 0)));
+			curve.addChild(new JsonValue(map.getFloat("c3", 0)));
+			curve.addChild(new JsonValue(map.getFloat("c4", 0)));
+			map.remove("c2");
+			map.remove("c3");
+			map.remove("c4");
+		}
+	}
+
 	static void setValue (JsonValue root, String newValue, String... path) {
 		for (JsonValue value : find(root, new Array<JsonValue>(), 0, path))
 			value.set(newValue);