add: 設定ファイルパーザ(暫定のすがた)

Author: halka9000stg

lib/xys.dart

@@ -0,0 +1,65 @@
+import "package:yaml/yaml.dart";
+import "package:timezone/timezone.dart" as tz;
+import "package:timezone/data/latest.dart" as tz;
+import "package:conscript_curator/xlib.dart";
+
+typedef XYSStore = List<XYSGroup>;
+typedef XYSTransformer<T> = T Function(XYSValue<T>);
+
+class XYSGroup {
+  final String name;
+  final Map<String, XYSValue> value;
+}
+
+class XYSValue<T> {
+  final XYSType<T> type;
+  YamlNode node;
+  T get value => this.type.transform(this);
+  R valueAs<R extends T>() {
+    return this.value as R;
+  }
+}
+
+class XYSType<T>{
+  final String name;
+  final XYSTransformer<T> transformer;
+
+  XYSType<T>(this.name, this.transformer);
+
+  T transform(XYSValue<T> value) => this.transformer(value);
+}
+
+extension XYSFinder on XYSStore {
+  Iterable<XYSValue> findMultiple({required String group, required String key, String? type}) {
+    Iterable<XYSValue> cand = this
+      .where((XYSGroup ge) => ge.name == group)
+      .map<Iterable<XYSValue>>((XYSGroup ge) => ge.value.entries
+        .where((MapEntry<String, XYSValue>　mev) => mev.key == key)
+        .map<XYSValue>((MapEntry<String, XYSValue>　mev) => mev.value))
+      .flatten();
+    if(type != null){
+      cand = cand.where((XYSValue v) => v.type.name == type);
+    }
+  }
+  XYSValue find({required String group, required String key, String? type}) => this.findMultiple(group: group, key: key, type: type).single;
+}
+
+XYSTransformer<Locale> localeTrans = (XYSValue<Locale> value) {
+  String s = value.node.asConstructor<String>("Locale", asIdentical<String>);
+  return Locale.fromSubtags(languageCode: "", countryCode: "");
+}
+XYSTransformer<Location> tzTrans = (XYSValue<Location> value) {
+  tz.initializeTimeZones();
+  return tz.getLocation(value.node.asConstructor<String>("TimeZone", asIdentical<String>));
+}
+XYSTransformer<Snowflake> snowflakeTrans = (XYSValue<Snowflake> value) => Snowflake(value.node.asConstructor<int>("Snowflake", int.parse));
+
+
+extension on YamlNode {
+  T asConstructor<T>(String name, T Function(String) parser){
+    if(this is YamlScalar){
+      (this as YamlScalar)
+    }
+  }
+}
+T asIdentical<T>(T value) => value;