From 7252346444db846efac7070ef72c7d04e4f9fc77 Mon Sep 17 00:00:00 2001
From: Thibault Deckers <thibault.deckers@gmail.com>
Date: Mon, 15 Feb 2021 17:57:05 +0900
Subject: [PATCH] info: format XMP MWG Regions section

---
 .../viewer/info/metadata/xmp_ns/mwg.dart      | 40 +++++++++++++++++++
 .../viewer/info/metadata/xmp_tile.dart        |  3 ++
 2 files changed, 43 insertions(+)
 create mode 100644 lib/widgets/viewer/info/metadata/xmp_ns/mwg.dart

diff --git a/lib/widgets/viewer/info/metadata/xmp_ns/mwg.dart b/lib/widgets/viewer/info/metadata/xmp_ns/mwg.dart
new file mode 100644
index 000000000..63286f574
--- /dev/null
+++ b/lib/widgets/viewer/info/metadata/xmp_ns/mwg.dart
@@ -0,0 +1,40 @@
+import 'package:aves/widgets/viewer/info/metadata/xmp_namespaces.dart';
+import 'package:aves/widgets/viewer/info/metadata/xmp_structs.dart';
+import 'package:flutter/widgets.dart';
+
+// cf www.metadataworkinggroup.org/pdf/mwg_guidance.pdf (down, as of 2021/02/15)
+class XmpMgwRegionsNamespace extends XmpNamespace {
+  static const ns = 'mwg-rs';
+
+  static final dimensionsPattern = RegExp(r'mwg-rs:Regions/mwg-rs:AppliedToDimensions/(.*)');
+  static final regionListPattern = RegExp(r'mwg-rs:Regions/mwg-rs:RegionList\[(\d+)\]/(.*)');
+
+  final dimensions = <String, String>{};
+  final regionList = <int, Map<String, String>>{};
+
+  XmpMgwRegionsNamespace() : super(ns);
+
+  @override
+  String get displayTitle => 'Regions';
+
+  @override
+  bool extractData(XmpProp prop) {
+    final hasStructs = extractStruct(prop, dimensionsPattern, dimensions);
+    final hasIndexedStructs = extractIndexedStruct(prop, regionListPattern, regionList);
+    return hasStructs || hasIndexedStructs;
+  }
+
+  @override
+  List<Widget> buildFromExtractedData() => [
+    if (dimensions.isNotEmpty)
+      XmpStructCard(
+        title: 'Applied To Dimensions',
+        struct: dimensions,
+      ),
+    if (regionList.isNotEmpty)
+      XmpStructArrayCard(
+        title: 'Region',
+        structByIndex: regionList,
+      ),
+  ];
+}
diff --git a/lib/widgets/viewer/info/metadata/xmp_tile.dart b/lib/widgets/viewer/info/metadata/xmp_tile.dart
index 731d49867..94ccc00f7 100644
--- a/lib/widgets/viewer/info/metadata/xmp_tile.dart
+++ b/lib/widgets/viewer/info/metadata/xmp_tile.dart
@@ -12,6 +12,7 @@ import 'package:aves/widgets/viewer/info/metadata/xmp_namespaces.dart';
 import 'package:aves/widgets/viewer/info/metadata/xmp_ns/exif.dart';
 import 'package:aves/widgets/viewer/info/metadata/xmp_ns/google.dart';
 import 'package:aves/widgets/viewer/info/metadata/xmp_ns/iptc.dart';
+import 'package:aves/widgets/viewer/info/metadata/xmp_ns/mwg.dart';
 import 'package:aves/widgets/viewer/info/metadata/xmp_ns/photoshop.dart';
 import 'package:aves/widgets/viewer/info/metadata/xmp_ns/tiff.dart';
 import 'package:aves/widgets/viewer/info/metadata/xmp_ns/xmp.dart';
@@ -60,6 +61,8 @@ class _XmpDirTileState extends State<XmpDirTile> with FeedbackMixin {
             return XmpGImageNamespace();
           case XmpIptcCoreNamespace.ns:
             return XmpIptcCoreNamespace();
+          case XmpMgwRegionsNamespace.ns:
+            return XmpMgwRegionsNamespace();
           case XmpMMNamespace.ns:
             return XmpMMNamespace();
           case XmpNoteNamespace.ns: