(+defaultWritingDirectionForLanguage:): Implement.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@19291 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,7 +1,12 @@
+2004-05-12 16:50  Alexander Malmberg <alexander@malmberg.org>
+
+	* Source/NSParagraphStyle.m (+defaultWritingDirectionForLanguage:):
+	Implement. Patch from Christopher Culver.
+
 2004-05-12 15:52  Alexander Malmberg <alexander@malmberg.org>
 
-	* (-_generateGlyphsForRun:at:): Use a properly typed function
-	pointer for characterIsMember.
+	* Source/GSLayoutManager.m (-_generateGlyphsForRun:at:): Use a
+	properly typed function pointer for characterIsMember.
 
 2004-05-08  Fred Kiefer <FredKiefer@gmx.de>
 

Headers/AppKit/NSParagraphStyle.h

@@ -134,6 +134,11 @@ typedef enum _NSWritingDirection {
 - (NSLineBreakMode) lineBreakMode;
 
 #ifndef	STRICT_OPENSTEP
+/*
+ *      Returns the writing direction of "language", which is an ISO 639
+ *      two- or three letter code, e.g. "en", or an ISO language-region
+ *      format, e.g. "en_GB"
+ */
 + (NSWritingDirection) defaultWritingDirectionForLanguage: (NSString*) language;
 - (NSWritingDirection) baseWritingDirection;
 #endif

Source/NSParagraphStyle.m

@@ -139,8 +139,35 @@ static NSParagraphStyle	*defaultStyle = nil;
 
 + (NSWritingDirection) defaultWritingDirectionForLanguage: (NSString*) language
 {
-  // FIXME
-  return NSWritingDirectionNaturalDirection;
+  static NSArray *rightToLeft;
+  NSWritingDirection writingDirection;
+  NSString *langCode = nil;
+
+  /* If language is 5/6 characters long with underscore in the middle,
+     treat it as ISO language-region format. */
+  if ([language length] == 5 && [language characterAtIndex: 2] == '_')
+      langCode = [language substringToIndex: 2];
+  else if ([language length] == 6 && [language characterAtIndex: 3] == '_')
+      langCode = [language substringToIndex: 3];
+  /* Else if it's just two or three chars long, treat as ISO 639 code. */
+  else if ([language length] == 2 || [language length] == 3)
+    langCode = language;
+  
+  if (!rightToLeft)
+    // Holds languages whose current scripts are written right to left.
+    rightToLeft = [[NSArray alloc] initWithObjects: @"ar", @"ara", @"arc",
+				   @"chi", @"fa", @"fas", @"he", @"heb", @"iw",
+				   @"ji", @"kas", @"ks", @"ku", @"kur", @"pa",
+				   @"pan", @"per" @"ps", @"pus", @"sd", @"snd",
+				   @"syr", @"tk", @"tmh", @"tuk", @"ug",
+				   @"uig", @"ur," @"urd", @"yi", @"yid", @"zh",
+				   @"zho", nil];
+  if ([rightToLeft containsObject: langCode] == YES)
+    writingDirection = NSWritingDirectionRightToLeft;
+  else // If it's not RTL, assume LTR.
+    writingDirection = NSWritingDirectionLeftToRight;
+  
+  return writingDirection;  
 }
 
 - (void) dealloc