Bug 1081858 - Part 3. Implement IsEastAsianWidthFWH using ICU or nsUnicodeProperties data. r=jfkthame

MozReview-Commit-ID: DvBgSm5SJwD

intl/unicharutil/util/nsUnicodeProperties.cpp

@@ -295,6 +295,11 @@ GetTitlecaseForAll(uint32_t aCh)
     }
     return aCh;
 }
+
+bool IsEastAsianWidthFWH(uint32_t aCh)
+{
+    return GetCharProps2(aCh).mEastAsianWidthFWH;
+}
 #endif
 
 #define DEFINE_BMP_1PLANE_MAPPING_GET_FUNC(prefix_) \

intl/unicharutil/util/nsUnicodeProperties.h

@@ -156,6 +156,22 @@ GetTitlecaseForAll(uint32_t aCh) // maps both UC and LC to titlecase
   return u_totitle(aCh);
 }
 
+inline bool
+IsEastAsianWidthFWH(uint32_t aCh)
+{
+  switch (u_getIntPropertyValue(aCh, UCHAR_EAST_ASIAN_WIDTH)) {
+    case U_EA_FULLWIDTH:
+    case U_EA_WIDE:
+    case U_EA_HALFWIDTH:
+      return true;
+    case U_EA_AMBIGUOUS:
+    case U_EA_NARROW:
+    case U_EA_NEUTRAL:
+      return false;
+  }
+  return false;
+}
+
 #else // not ENABLE_INTL_API
 
 // Return whether the char has a mirrored-pair counterpart.
@@ -192,6 +208,9 @@ uint32_t GetLowercase(uint32_t aCh);
 uint32_t GetTitlecaseForLower(uint32_t aCh); // maps LC to titlecase, UC unchanged
 uint32_t GetTitlecaseForAll(uint32_t aCh); // maps both UC and LC to titlecase
 
+// Return whether the char has EastAsianWidth class F or W or H.
+bool IsEastAsianWidthFWH(uint32_t aCh);
+
 #endif // !ENABLE_INTL_API
 
 // returns the simplified Gen Category as defined in nsIUGenCategory