/// <summary>
/// maps each none persian chracter to equivalent persian character
/// </summary>
/// <param name="c">The character to remap to persian character</param>
/// <returns>if there is a map for given character returns a PersianCharacter, otherwise null.</returns>
public PersianCharacter GetMappedCharacter(char c)
{
PersianCharacter result = null;
if (!_Map.TryGetValue(c, out result))
{
result = null;
}
return(result);
}
private void CreateMap(PersianCharacter pc, params char[] keys)
{
char c = ' ';
try
{
foreach (var k in keys)
{
c = k;
_Map.Add(k, pc);
}
}
catch (ArgumentException ex)
{
throw new ArgumentException("Key exist " + c, "keys", ex);
}
}
/// <summary>
/// Convert specified text to equivalent persian text
/// </summary>
/// <param name="text">Text to convert</param>
/// <returns>Converted text</returns>
public string Convert(string text)
{
if (string.IsNullOrEmpty(text))
{
return(string.Empty);
}
else
{
// make sure that we alocated enough space for text
EnsureCharSize(text.Length);
// find maps (if exist)
for (int i = 0; i < text.Length; i++)
{
CharInfo cf = _SourceChars[i];
cf.SourceChar = text[i];
cf.Character = CharacterMap.GetMappedCharacter(cf.SourceChar);
cf.Form = PersianCharacterForm.Isolated;
}
// calc forms of each character
for (int i = 0; i < text.Length; i++)
{
PersianCharacter currentPc = _SourceChars[i].Character;
PersianCharacter prePc = null;
PersianCharacter nextPc = null;
PersianCharacterForm form = PersianCharacterForm.Isolated;
if (currentPc != null)
{
if (i > 0)
{
prePc = _SourceChars[i - 1].Character;
}
if (i < text.Length - 1)
{
nextPc = _SourceChars[i + 1].Character;
}
if (prePc == null)
{
if (nextPc != null && nextPc.CanStickToPrevious && currentPc.CanStickToNext)
{
form = PersianCharacterForm.Initial;
}
}
else if (nextPc == null)
{
if (prePc != null && prePc.CanStickToNext)
{
form = PersianCharacterForm.Final;
}
}
else
{
if (nextPc.CanStickToPrevious && prePc.CanStickToNext)
{
if (currentPc.CanStickToNext)
{
form = PersianCharacterForm.Medial;
}
else
{
form = PersianCharacterForm.Final;
}
}
else if (prePc.CanStickToNext)
{
form = PersianCharacterForm.Final;
}
else if (nextPc.CanStickToPrevious && currentPc.CanStickToNext)
{
form = PersianCharacterForm.Initial;
}
}
}
_SourceChars[i].Form = form;
}
// build text from end to start
if (!RightToLeft)
{
Reverse(_SourceChars, 0, text.Length - 1);
int invalidIndex = -1000;
int firstLTRIndex = invalidIndex;
for (int i = 0; i < text.Length; i++)
{
CharInfo cf = _SourceChars[i];
if (cf.Character == null || cf.Character.LeftToRight || cf.SourceChar == ' ')
{
if (firstLTRIndex == invalidIndex && cf.SourceChar != ' ')
{
firstLTRIndex = i;
}
}
else
{
if (firstLTRIndex != invalidIndex)
{
int spaceCount = 0;
for (int k = i - 1; k >= 0; k--)
{
if (_SourceChars[k].SourceChar == ' ')
{
spaceCount++;
}
else
{
break;
}
}
Reverse(_SourceChars, firstLTRIndex, i - 1 - spaceCount);
firstLTRIndex = invalidIndex;
}
}
}
if (firstLTRIndex != invalidIndex)
{
Reverse(_SourceChars, firstLTRIndex, text.Length - 1);
firstLTRIndex = invalidIndex;
}
}
StringBuilder result = new StringBuilder();
for (int i = 0; i < text.Length; i++)
{
CharInfo cf = _SourceChars[i];
if (cf != null && cf.Character != null)
{
result.Append(cf.Character[cf.Form]);
}
else
{
result.Append(cf.SourceChar);
}
}
if (ConvertLigature)
{
foreach (var li in _Ligatures)
{
result.Replace(li.Source, li.Replace);
}
}
return(result.ToString());
}
}
/// <summary>
/// Convert specified text to equivalent persian text
/// </summary>
/// <param name="text">Text to convert</param>
/// <returns>Converted text</returns>
public string Convert(string text)
{
if (string.IsNullOrEmpty(text))
{
LastConvertedText = string.Empty;
}
else if (LastConvertedText != null && LastConvertedText.Equals(text, StringComparison.Ordinal))
{
return(LastConvertedText);
}
else
{
// make sure that we alocated enough space for text
EnsureCharSize(text.Length);
if (LastConvertedText == null)
{
LastConvertedText = string.Empty;
}
int startoldIndex = 0;
int lastoldIndex = LastConvertedText.Length - 1;
if (LastConvertedText.Length == text.Length + 1) // characters removed
{
int index = LastConvertedText.IndexOf(text);
if (index >= 0)
{
if (index == 0)
{
PersianCharacter pc = CharacterMap.GetMappedCharacter(LastConvertedText[LastConvertedText.Length - 1]);
if (pc != null && !pc.LeftToRight)
{
// we have to remove from first because text is reversed
startoldIndex = LastConvertedText.Length - text.Length;
}
else
{
lastoldIndex = text.Length - 1;
}
}
else
{
lastoldIndex = text.Length - 1;
}
text = LastConvertedText.Substring(startoldIndex, text.Length);
}
}
bool findDiff = false;
for (int i = 0; i < text.Length; i++)
{
CharInfo cf = _SourceChars[i];
cf.SourceChar = text[i];
cf.Character = CharacterMap.GetMappedCharacter(cf.SourceChar);
cf.Form = PersianCharacterForm.Isolated;
_RepositionedChars[i] = null;
cf.IsReversed = false;
// start from begin and search for missmatch
if (!findDiff && startoldIndex < LastConvertedText.Length)
{
if (cf.SourceChar == LastConvertedText[startoldIndex])
{
startoldIndex++;
cf.IsReversed = true;
}
else
{
findDiff = true;
}
}
}
if (findDiff) // if we found missmatch start from last index to find last missmatch
{
for (int i = text.Length - 1; i >= 0; i--)
{
CharInfo cf = _SourceChars[i];
if (lastoldIndex >= startoldIndex)
{
if (cf.SourceChar == LastConvertedText[lastoldIndex])
{
lastoldIndex--;
cf.IsReversed = true;
}
else
{
break;
}
}
}
}
// find none persian characters and place them in correct position
for (int i = 0; i < text.Length; i++)
{
CharInfo cf = _SourceChars[i];
if (!cf.IsReversed)
{
_RepositionedChars[text.Length - i - 1] = cf;
}
}
// place persian characters ( that we found them in previous text change) in correct position
int j = 0;
for (int i = 0; i < text.Length; i++)
{
if (_RepositionedChars[i] == null)
{
for (; j < text.Length; j++)
{
if (_SourceChars[j].IsReversed)
{
_RepositionedChars[i] = _SourceChars[j];
j++;
break;
}
}
}
}
// place Left To Right characters to correct place
// find one left to right character
for (int i = 0; i < text.Length; i++)
{
CharInfo cf = _RepositionedChars[i];
if (!cf.IsReversed && (cf.Character == null || cf.Character.LeftToRight))
{
// find surrounding ltf chars
int startIndex = i;
int endIndex = i;
//find most previous valid ltf index
for (int k = i - 1; k >= 0; k--)
{
CharInfo cf2 = _RepositionedChars[k];
if (cf2.IsReversed && (cf2.Character == null || cf2.Character.LeftToRight))
{
startIndex = k;
}
else
{
break;
}
}
//find most next valid ltf index
for (int k = i + 1; k < text.Length; k++)
{
CharInfo cf2 = _RepositionedChars[k];
if (cf2.IsReversed && (cf2.Character == null || cf2.Character.LeftToRight))
{
endIndex = k;
}
else
{
break;
}
}
int index = endIndex - (i - startIndex);
int sign = Math.Sign(index - i);
for (int k = i; k != index; k += sign)
{
_RepositionedChars[k] = _RepositionedChars[k + sign];
}
_RepositionedChars[index] = cf;
cf.IsReversed = true;
}
}
// calc forms of each character
for (int i = 0; i < text.Length; i++)
{
PersianCharacter currentPc = _RepositionedChars[i].Character;
PersianCharacter prePc = null;
PersianCharacter nextPc = null;
PersianCharacterForm form = PersianCharacterForm.Isolated;
if (currentPc != null)
{
if (i > 0)
{
nextPc = _RepositionedChars[i - 1].Character;
}
if (i < text.Length - 1)
{
prePc = _RepositionedChars[i + 1].Character;
}
if (prePc == null)
{
if (nextPc != null && nextPc.CanStickToPrevious && currentPc.CanStickToNext)
{
form = PersianCharacterForm.Initial;
}
}
else if (nextPc == null)
{
if (prePc != null && prePc.CanStickToNext)
{
form = PersianCharacterForm.Final;
}
}
else
{
if (nextPc.CanStickToPrevious && prePc.CanStickToNext)
{
if (currentPc.CanStickToNext)
{
form = PersianCharacterForm.Medial;
}
else
{
form = PersianCharacterForm.Final;
}
}
else if (prePc.CanStickToNext)
{
form = PersianCharacterForm.Final;
}
else if (nextPc.CanStickToPrevious && currentPc.CanStickToNext)
{
form = PersianCharacterForm.Initial;
}
}
}
_RepositionedChars[i].Form = form;
}
// build text from end to start
StringBuilder result = new StringBuilder();
for (int i = 0; i < text.Length; i++)
{
CharInfo cf = _RepositionedChars[i];
if (cf.Character != null)
{
result.Append(cf.Character[cf.Form]);
}
else
{
result.Append(cf.SourceChar);
}
}
if (ConvertLigature)
{
result.Replace("\uFE8E\uFEDF", "\uFEFB");
result.Replace("\uFE8E\uFEE0", "\uFEFC");
result.Replace("\uFEEA\uFEE0\uFEDF\uFE8D", "\uFDF2");
}
LastConvertedText = result.ToString();
}
return(LastConvertedText);
}
