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//
// System.Globalization.StringInfo.cs
//
// Author:
// Dick Porter (dick@ximian.com)
//
// (C) 2002 Ximian, Inc.
// (C) 2004 Novell, Inc.
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Collections;
namespace System.Globalization {
[Serializable]
#if NET_2_0
[System.Runtime.InteropServices.ComVisible(true)]
#endif
public class StringInfo {
public StringInfo()
{
}
public static string GetNextTextElement(string str)
{
if(str == null || str.Length == 0) {
throw new ArgumentNullException("string is null");
}
return(GetNextTextElement (str, 0));
}
public static string GetNextTextElement(string str, int index)
{
if(str == null) {
throw new ArgumentNullException("string is null");
}
if(index < 0 || index >= str.Length) {
throw new ArgumentOutOfRangeException ("Index is not valid");
}
/* Find the next base character, surrogate
* pair or combining character sequence
*/
char ch = str[index];
UnicodeCategory cat = char.GetUnicodeCategory (ch);
if (cat == UnicodeCategory.Surrogate) {
/* Check that it's a high surrogate
* followed by a low surrogate
*/
if (ch >= 0xD800 && ch <= 0xDBFF) {
if ((index + 1) < str.Length &&
str[index + 1] >= 0xDC00 &&
str[index + 1] <= 0xDFFF) {
/* A valid surrogate pair */
return(str.Substring (index, 2));
} else {
/* High surrogate on its own */
return(new String (ch, 1));
}
} else {
/* Low surrogate on its own */
return(new String (ch, 1));
}
} else {
/* Look for a base character, which
* may or may not be followed by a
* series of combining characters
*/
if (cat == UnicodeCategory.NonSpacingMark ||
cat == UnicodeCategory.SpacingCombiningMark ||
cat == UnicodeCategory.EnclosingMark) {
/* Not a base character */
return(new String (ch, 1));
}
int count = 1;
while (index + count < str.Length) {
cat = char.GetUnicodeCategory (str[index + count]);
if (cat != UnicodeCategory.NonSpacingMark &&
cat != UnicodeCategory.SpacingCombiningMark &&
cat != UnicodeCategory.EnclosingMark) {
/* Finished the sequence */
break;
}
count++;
}
return(str.Substring (index, count));
}
}
public static TextElementEnumerator GetTextElementEnumerator(string str)
{
if(str == null || str.Length == 0) {
throw new ArgumentNullException("string is null");
}
return(new TextElementEnumerator (str, 0));
}
public static TextElementEnumerator GetTextElementEnumerator(string str, int index)
{
if(str == null) {
throw new ArgumentNullException("string is null");
}
if(index < 0 || index >= str.Length) {
throw new ArgumentOutOfRangeException ("Index is not valid");
}
return(new TextElementEnumerator (str, index));
}
public static int[] ParseCombiningCharacters(string str)
{
if(str == null) {
throw new ArgumentNullException("string is null");
}
ArrayList indices = new ArrayList (str.Length);
TextElementEnumerator tee = GetTextElementEnumerator (str);
tee.Reset ();
while(tee.MoveNext ()) {
indices.Add (tee.ElementIndex);
}
return((int[])indices.ToArray (typeof (int)));
}
}
}
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