[Mono-bugs] [Bug 39105][Nor] New - System.Text.RegularExpressions.CategoryUtils.CategoryFromName fails for one-letter categories

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Changed by mathias.hasselmann@gmx.de.

http://bugzilla.ximian.com/show_bug.cgi?id=39105

--- shadow/39105	Wed Mar  5 10:24:31 2003
+++ shadow/39105.tmp.718	Wed Mar  5 10:24:31 2003
@@ -0,0 +1,43 @@
+Bug#: 39105
+Product: Mono/Class Libraries
+Version: unspecified
+OS: All
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: System
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: mathias.hasselmann@gmx.de               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: System.Text.RegularExpressions.CategoryUtils.CategoryFromName fails for one-letter categories
+
+Calling
+'System.Text.RegularExpressions.CategoryUtils.CategoryFromName("L");'
+returns 'System.Text.RegularExpressions.Category.None' instead of the
+considered 'System.Text.RegularExpressions.Category.UnicodeL'. This causes
+problems when parsing regular expressions containing the Unicode reference
+'\p{L}'.
+
+Reason is the invalid assumtion that strings passed to CategoryFromName
+always have a lenght of at least two characters:
+
+public static Category CategoryFromName (string name) {
+  try {
+    if (name.Substring (0, 2).Equals ("Is"))	// remove prefix from block range
+        ~~~~~~~~~~~~~~~~~~~~~ <-- GOSH!
+      name = name.Substring (2);
+
+      return (Category)Enum.Parse (typeof (Category), "Unicode" + name);
+  }
+  catch (ArgumentException) {
+    return Category.None;
+  }
+}
+
+Fix: Replace 'if (name.Substring (0, 2).Equals ("Is"))' by 'if (name.Length
+> 2 && name.Substring (0, 2).Equals ("Is"))'