Bug 1032671 - Part 1. Add emoji presentation API for UTR#51. r=jfkthame

From ICU 57, ICU supports emoji presentation as draft API.

MozReview-Commit-ID: 6JgQMv4Ky9m

intl/unicharutil/util/nsUnicodeProperties.h

@@ -46,6 +46,12 @@ enum IdentifierType {
   IDTYPE_ALLOWED = 1,
 };
 
+enum EmojiPresentation {
+  TextOnly = 0,
+  TextDefault = 1,
+  EmojiDefault = 2
+};
+
 extern const hb_unicode_general_category_t sICUtoHBcategory[];
 
 inline uint32_t
@@ -172,6 +178,19 @@ IsDefaultIgnorable(uint32_t aCh)
   return u_hasBinaryProperty(aCh, UCHAR_DEFAULT_IGNORABLE_CODE_POINT);
 }
 
+inline EmojiPresentation
+GetEmojiPresentation(uint32_t aCh)
+{
+  if (!u_hasBinaryProperty(aCh, UCHAR_EMOJI)) {
+    return TextOnly;
+  }
+
+  if (u_hasBinaryProperty(aCh, UCHAR_EMOJI_PRESENTATION)) {
+    return EmojiDefault;
+  }
+  return TextDefault;
+}
+
 // returns the simplified Gen Category as defined in nsUGenCategory
 inline nsUGenCategory GetGenCategory(uint32_t aCh) {
   return sDetailedToGeneralCategory[GetGeneralCategory(aCh)];