content [nfc]: Move tryParseEmojiCodeToUnicode out to toplevel, to export

Author: chrisbobbe

lib/model/content.dart

@@ -495,6 +495,27 @@ class ImageEmojiNode extends EmojiNode {
 
 ////////////////////////////////////////////////////////////////
 
+// Ported from https://github.com/zulip/zulip-mobile/blob/c979530d6804db33310ed7d14a4ac62017432944/src/emoji/data.js#L108-L112
+//
+// Which was in turn ported from https://github.com/zulip/zulip/blob/63c9296d5339517450f79f176dc02d77b08020c8/zerver/models.py#L3235-L3242
+// and that describes the encoding as follows:
+//
+// > * For Unicode emoji, [emoji_code is] a dash-separated hex encoding of
+// >   the sequence of Unicode codepoints that define this emoji in the
+// >   Unicode specification.  For examples, see "non_qualified" or
+// >   "unified" in the following data, with "non_qualified" taking
+// >   precedence when both present:
+// >   https://github.com/raw/iamcal/emoji-data/master/emoji_pretty.json
+String? tryParseEmojiCodeToUnicode(String code) {
+  try {
+    return String.fromCharCodes(code.split('-').map((hex) => int.parse(hex, radix: 16)));
+  } on FormatException { // thrown by `int.parse`
+    return null;
+  } on ArgumentError { // thrown by `String.fromCharCodes`
+    return null;
+  }
+}
+
 /// What sort of nodes a [_ZulipContentParser] is currently expecting to find.
 enum _ParserContext {
   /// The parser is currently looking for block nodes.
@@ -525,27 +546,6 @@ class _ZulipContentParser {
 
   static final _emojiClassRegexp = RegExp(r"^emoji(-[0-9a-f]+)*$");
 
-  // Ported from https://github.com/zulip/zulip-mobile/blob/c979530d6804db33310ed7d14a4ac62017432944/src/emoji/data.js#L108-L112
-  //
-  // Which was in turn ported from https://github.com/zulip/zulip/blob/63c9296d5339517450f79f176dc02d77b08020c8/zerver/models.py#L3235-L3242
-  // and that describes the encoding as follows:
-  //
-  // > * For Unicode emoji, [emoji_code is] a dash-separated hex encoding of
-  // >   the sequence of Unicode codepoints that define this emoji in the
-  // >   Unicode specification.  For examples, see "non_qualified" or
-  // >   "unified" in the following data, with "non_qualified" taking
-  // >   precedence when both present:
-  // >   https://github.com/raw/iamcal/emoji-data/master/emoji_pretty.json
-  String? tryParseEmojiCodeToUnicode(String code) {
-    try {
-      return String.fromCharCodes(code.split('-').map((hex) => int.parse(hex, radix: 16)));
-    } on FormatException { // thrown by `int.parse`
-      return null;
-    } on ArgumentError { // thrown by `String.fromCharCodes`
-      return null;
-    }
-  }
-
   InlineContentNode parseInlineContent(dom.Node node) {
     assert(_debugParserContext == _ParserContext.inline);
     final debugHtmlNode = kDebugMode ? node : null;