/// <summary>
/// Fixes the provided string
/// </summary>
/// <param name="input">Text to fix</param>
/// <param name="output">Fixed text</param>
/// <param name="fixTextTags"></param>
/// <param name="preserveNumbers"></param>
/// <param name="farsi"></param>
/// <returns>Fixed text</returns>
public static void FixRTL(
string input,
FastStringBuilder output,
bool farsi = true,
bool fixTextTags = true,
bool preserveNumbers = false)
{
inputBuilder.SetValue(input);
TashkeelFixer.RemoveTashkeel(inputBuilder);
// The shape of the letters in shapeFixedLetters is fixed according to their position in word. But the flow of the text is not fixed.
GlyphFixer.Fix(inputBuilder, glyphFixerOutput, preserveNumbers, farsi);
//Restore tashkeel to their places.
TashkeelFixer.RestoreTashkeel(glyphFixerOutput);
// Fix flow of the text and put the result in FinalLetters field
LigatureFixer.Fix(glyphFixerOutput, output, farsi, fixTextTags, preserveNumbers);
if (fixTextTags)
{
RichTextFixer.Fix(output);
}
inputBuilder.Clear();
}
/// <summary>
/// Replace Shadda + Another Tashkeel with combined form
/// </summary>
public static void FixShaddaCombinations(FastStringBuilder input)
{
/*
* Fix of https://github.com/mnarimani/RTLTMPro/issues/13
*/
int j = 0; // write index
int i = 0; // read index
while (i < input.Length)
{
int curChar = input.Get(i);
int nextChar = i < input.Length - 1 ? input.Get(i + 1) : (char)0;
if ((TashkeelCharacters)curChar == TashkeelCharacters.Shadda &&
ShaddaCombinationMap.ContainsKey((char)nextChar))
{
input.Set(j, ShaddaCombinationMap[(char)nextChar]);
j++;
i += 2;
}
else
{
input.Set(j, curChar);
j++;
i++;
}
}
input.Length = j;
}
/// <summary>
/// Restores removed tashkeel.
/// </summary>
public static void RestoreTashkeel(FastStringBuilder letters)
{
foreach (TashkeelLocation location in TashkeelLocations)
{
letters.Insert(location.Position, location.Tashkeel);
}
}
/// <summary>
/// Restores removed tashkeel.
/// </summary>
public static void RestoreTashkeel(FastStringBuilder letters)
{
int letterWithTashkeelTracker = 0;
foreach (TashkeelLocation location in TashkeelLocations)
{
letters.Insert(location.Position + letterWithTashkeelTracker, location.Tashkeel);
//letterWithTashkeelTracker++;
}
/*
* Fix of https://github.com/mnarimani/RTLTMPro/issues/13
* The workaround is to replace Shadda + Another Tashkeel with combined form
*/
letters.Replace(ShaddaFatha, ShaddaWithFathaIsolatedForm);
letters.Replace(ShaddaDamma, ShaddaWithDammaIsolatedForm);
letters.Replace(ShaddaKasra, ShaddaWithKasraIsolatedForm);
letters.Replace(ShaddaDammatan, ShaddaWithDammatanIsolatedForm);
letters.Replace(ShaddaKasratan, ShaddaWithKasratanIsolatedForm);
letters.Replace(ShaddaSuperscriptAlef, ShaddaWithSuperscriptAlefIsolatedForm);
TashkeelLocations.Clear();
}
public void Substring(FastStringBuilder output, int start, int length)
{
output.Length = 0;
for (int i = 0; i < length; i++)
{
output.Append(array[start + i]);
}
}
private static void FlushBufferToOutput(List <char> buffer, FastStringBuilder output)
{
for (int j = 0; j < buffer.Count; j++)
{
output.Append(buffer[buffer.Count - 1 - j]);
}
buffer.Clear();
}
/// <summary>
/// Converts English numbers to Persian or Arabic numbers.
/// </summary>
/// <param name="text"></param>
/// <param name="farsi"></param>
/// <returns>Converted number</returns>
public static void FixNumbers(FastStringBuilder text, bool farsi)
{
text.Replace((char)EnglishNumbers.Zero, farsi ? (char)FarsiNumbers.Zero : (char)HinduNumbers.Zero);
text.Replace((char)EnglishNumbers.One, farsi ? (char)FarsiNumbers.One : (char)HinduNumbers.One);
text.Replace((char)EnglishNumbers.Two, farsi ? (char)FarsiNumbers.Two : (char)HinduNumbers.Two);
text.Replace((char)EnglishNumbers.Three, farsi ? (char)FarsiNumbers.Three : (char)HinduNumbers.Three);
text.Replace((char)EnglishNumbers.Four, farsi ? (char)FarsiNumbers.Four : (char)HinduNumbers.Four);
text.Replace((char)EnglishNumbers.Five, farsi ? (char)FarsiNumbers.Five : (char)HinduNumbers.Five);
text.Replace((char)EnglishNumbers.Six, farsi ? (char)FarsiNumbers.Six : (char)HinduNumbers.Six);
text.Replace((char)EnglishNumbers.Seven, farsi ? (char)FarsiNumbers.Seven : (char)HinduNumbers.Seven);
text.Replace((char)EnglishNumbers.Eight, farsi ? (char)FarsiNumbers.Eight : (char)HinduNumbers.Eight);
text.Replace((char)EnglishNumbers.Nine, farsi ? (char)FarsiNumbers.Nine : (char)HinduNumbers.Nine);
}
/// <summary>
/// Removes tashkeel. Converts general RTL letters to isolated form. Also fixes Farsi and Arabic ی letter.
/// </summary>
/// <param name="text">Input to prepare</param>
/// <param name="farsi"></param>
/// <returns>Prepared input in char array</returns>
public static void FixYah(FastStringBuilder text, bool farsi)
{
for (int i = 0; i < text.Length; i++)
{
if (farsi && text.Get(i) == (int)ArabicGeneralLetters.Ya)
{
text.Set(i, (char)ArabicGeneralLetters.PersianYa);
}
else if (farsi == false && text.Get(i) == (int)ArabicGeneralLetters.PersianYa)
{
text.Set(i, (char)ArabicGeneralLetters.Ya);
}
}
}
/// <summary>
/// Is the letter at provided index a finishing letter?
/// </summary>
/// <returns><see langword="true" /> if the letter is a finishing letter</returns>
private static bool IsFinishingLetter(FastStringBuilder letters, int index)
{
int currentIndexLetter = letters.Get(index);
int previousIndexLetter = default;
if (index != 0)
{
previousIndexLetter = letters.Get(index - 1);
}
bool isPreviousLetterConnectable = index != 0 &&
previousIndexLetter != ' ' &&
previousIndexLetter != (int)ArabicGeneralLetters.Dal &&
previousIndexLetter != (int)ArabicGeneralLetters.Thal &&
previousIndexLetter != (int)ArabicGeneralLetters.Ra2 &&
previousIndexLetter != (int)ArabicGeneralLetters.Zeen &&
previousIndexLetter != (int)ArabicGeneralLetters.PersianZe &&
previousIndexLetter != (int)ArabicGeneralLetters.Waw &&
previousIndexLetter != (int)ArabicGeneralLetters.Alef &&
previousIndexLetter != (int)ArabicGeneralLetters.AlefMad &&
previousIndexLetter != (int)ArabicGeneralLetters.AlefHamza &&
previousIndexLetter != (int)ArabicGeneralLetters.AlefMaksoor &&
previousIndexLetter != (int)ArabicGeneralLetters.WawHamza &&
previousIndexLetter != (int)ArabicGeneralLetters.Hamza &&
previousIndexLetter != (int)ArabicGeneralLetters.ZeroWidthNoJoiner &&
previousIndexLetter != (int)ArabicIsolatedLetters.Dal &&
previousIndexLetter != (int)ArabicIsolatedLetters.Thal &&
previousIndexLetter != (int)ArabicIsolatedLetters.Ra2 &&
previousIndexLetter != (int)ArabicIsolatedLetters.Zeen &&
previousIndexLetter != (int)ArabicIsolatedLetters.PersianZe &&
previousIndexLetter != (int)ArabicIsolatedLetters.Waw &&
previousIndexLetter != (int)ArabicIsolatedLetters.Alef &&
previousIndexLetter != (int)ArabicIsolatedLetters.AlefMad &&
previousIndexLetter != (int)ArabicIsolatedLetters.AlefHamza &&
previousIndexLetter != (int)ArabicIsolatedLetters.AlefMaksoor &&
previousIndexLetter != (int)ArabicIsolatedLetters.WawHamza &&
previousIndexLetter != (int)ArabicIsolatedLetters.Hamza &&
(previousIndexLetter < 0xFFFF && TextUtils.IsGlyphFixedArabicCharacter((char)previousIndexLetter));
bool canThisLetterBeFinishing = currentIndexLetter != ' ' &&
currentIndexLetter != (int)ArabicGeneralLetters.ZeroWidthNoJoiner &&
currentIndexLetter != (int)ArabicGeneralLetters.Hamza;
return(isPreviousLetterConnectable && canThisLetterBeFinishing);
}
/// <summary>
/// Removes tashkeel from text.
/// </summary>
public static void RemoveTashkeel(FastStringBuilder input)
{
TashkeelLocations.Clear();
int j = 0; // write index
for (int i = 0; i < input.Length; i++)
{
int curChar = input.Get(i);
if (Char32Utils.IsUnicode16Char(curChar) && TashkeelCharactersSet.Contains((char)curChar))
{
TashkeelLocations.Add(new TashkeelLocation((TashkeelCharacters)curChar, i));
}
else
{
input.Set(j, curChar);
j++;
}
}
input.Length = j;
}
/// <summary>
/// Handles the special Lam-Alef connection in the text.
/// </summary>
/// <param name="input"></param>
/// <param name="output"></param>
/// <param name="i">Index of Lam letter</param>
/// <returns><see langword="true" /> if special connection has been made.</returns>
private static bool HandleSpecialLam(FastStringBuilder input, FastStringBuilder output, int i)
{
bool isFixed;
switch (input.Get(i + 1))
{
case (char)ArabicGeneralLetters.AlefMaksoor:
output.Set(i, (char)0xFEF7);
isFixed = true;
break;
case (char)ArabicGeneralLetters.Alef:
output.Set(i, (char)0xFEF9);
isFixed = true;
break;
case (char)ArabicGeneralLetters.AlefHamza:
output.Set(i, (char)0xFEF5);
isFixed = true;
break;
case (char)ArabicGeneralLetters.AlefMad:
output.Set(i, (char)0xFEF3);
isFixed = true;
break;
default:
isFixed = false;
break;
}
if (isFixed)
{
output.Set(i + 1, (char)0xFFFF);
}
return(isFixed);
}
/// <summary>
/// Converts English numbers that are outside tags to Persian or Arabic numbers.
/// </summary>
/// <param name="text"></param>
/// <param name="farsi"></param>
/// <returns>Text with converted numbers</returns>
public static void FixNumbersOutsideOfTags(FastStringBuilder text, bool farsi)
{
var englishDigits = new HashSet <char>(EnglishToFarsiNumberMap.Keys);
for (int i = 0; i < text.Length; i++)
{
var iChar = text.Get(i);
// skip valid tags
if (iChar == '<')
{
bool sawValidTag = false;
for (int j = i + 1; j < text.Length; j++)
{
int jChar = text.Get(j);
if ((j == i + 1 && jChar == ' ') || jChar == '<')
{
break;
}
else if (jChar == '>')
{
i = j;
sawValidTag = true;
break;
}
}
if (sawValidTag)
{
continue;
}
}
if (englishDigits.Contains((char)iChar))
{
text.Set(i, farsi ? EnglishToFarsiNumberMap[(char)iChar] : EnglishToHinduNumberMap[(char)iChar]);
}
}
}
public void Insert(int pos, FastStringBuilder str, int offset, int count)
{
if (str == this)
{
throw new InvalidOperationException("You cannot pass the same string builder to insert");
}
if (count == 0)
{
return;
}
Length += count;
EnsureCapacity(Length, true);
for (int i = Length - count - 1; i >= pos; i--)
{
array[i + count] = array[i];
}
for (int i = 0; i < count; i++)
{
array[pos + i] = str.array[offset + i];
}
}
public void Insert(int pos, FastStringBuilder str)
{
Insert(pos, str, 0, str.Length);
}
public void SetValue(FastStringBuilder other)
{
EnsureCapacity(other.Length, false);
Copy(other.array, array);
Length = other.Length;
}
/// <summary>
/// Fixes the flow of the text.
/// </summary>
public static void Fix(FastStringBuilder input, FastStringBuilder output, bool farsi, bool fixTextTags, bool preserveNumbers)
{
// Some texts like tags, English words and numbers need to be displayed in their original order.
// This list keeps the characters that their order should be reserved and streams reserved texts into final letters.
LtrTextHolder.Clear();
for (int i = input.Length - 1; i >= 0; i--)
{
bool isInMiddle = i > 0 && i < input.Length - 1;
bool isAtBeginning = i == 0;
bool isAtEnd = i == input.Length - 1;
char characterAtThisIndex = input.Get(i);
char nextCharacter = default;
if (!isAtEnd)
{
nextCharacter = input.Get(i + 1);
}
char previousCharacter = default;
if (!isAtBeginning)
{
previousCharacter = input.Get(i - 1);
}
if (char.IsPunctuation(characterAtThisIndex) || char.IsSymbol(characterAtThisIndex))
{
if (fixTextTags)
{
if (characterAtThisIndex == '>')
{
// We need to check if it is actually the beginning of a tag.
bool isValidTag = false;
// If > is at the end of the text (At beginning of the array), it can't be a tag
if (isAtEnd == false)
{
for (int j = i - 1; j >= 0; j--)
{
// Tags do not have space inside
if (input.Get(j) == ' ')
{
break;
}
// Tags do not have RTL characters inside
if (TextUtils.IsRTLCharacter(input.Get(j)))
{
break;
}
if (input.Get(j) == '<')
{
isValidTag = true;
break;
}
}
}
if (LtrTextHolder.Count > 0 && isValidTag)
{
for (int j = 0; j < LtrTextHolder.Count; j++)
{
output.Append(LtrTextHolder[LtrTextHolder.Count - 1 - j]);
}
LtrTextHolder.Clear();
}
}
}
if (characterAtThisIndex == ')')
{
if (isInMiddle)
{
bool isAfterRTLCharacter = TextUtils.IsRTLCharacter(previousCharacter);
bool isBeforeRTLCharacter = TextUtils.IsRTLCharacter(nextCharacter);
if (isAfterRTLCharacter || isBeforeRTLCharacter)
{
characterAtThisIndex = '(';
}
}
else if (isAtEnd)
{
bool isAfterRTLCharacter = TextUtils.IsRTLCharacter(previousCharacter);
if (isAfterRTLCharacter)
{
characterAtThisIndex = '(';
}
}
else if (isAtBeginning)
{
bool isBeforeRTLCharacter = TextUtils.IsRTLCharacter(nextCharacter);
if (isBeforeRTLCharacter)
{
characterAtThisIndex = '(';
}
}
}
else if (characterAtThisIndex == '(')
{
if (isInMiddle)
{
bool isAfterRTLCharacter = TextUtils.IsRTLCharacter(previousCharacter);
bool isBeforeRTLCharacter = TextUtils.IsRTLCharacter(nextCharacter);
if (isAfterRTLCharacter || isBeforeRTLCharacter)
{
characterAtThisIndex = ')';
}
}
else if (isAtEnd)
{
bool isAfterRTLCharacter = TextUtils.IsRTLCharacter(previousCharacter);
if (isAfterRTLCharacter)
{
characterAtThisIndex = ')';
}
}
else if (isAtBeginning)
{
bool isBeforeRTLCharacter = TextUtils.IsRTLCharacter(nextCharacter);
if (isBeforeRTLCharacter)
{
characterAtThisIndex = ')';
}
}
}
else if (characterAtThisIndex == '«')
{
if (isInMiddle)
{
bool isAfterRTLCharacter = TextUtils.IsRTLCharacter(nextCharacter);
bool isBeforeRTLCharacter = TextUtils.IsRTLCharacter(previousCharacter);
if (isAfterRTLCharacter || isBeforeRTLCharacter)
{
characterAtThisIndex = '»';
}
}
else if (isAtEnd)
{
bool isAfterRTLCharacter = TextUtils.IsRTLCharacter(nextCharacter);
if (isAfterRTLCharacter)
{
characterAtThisIndex = '»';
}
}
else if (isAtBeginning)
{
bool isBeforeRTLCharacter = TextUtils.IsRTLCharacter(previousCharacter);
if (isBeforeRTLCharacter)
{
characterAtThisIndex = '»';
}
}
}
else if (characterAtThisIndex == '»')
{
if (isInMiddle)
{
bool isAfterRTLCharacter = TextUtils.IsRTLCharacter(nextCharacter);
bool isBeforeRTLCharacter = TextUtils.IsRTLCharacter(previousCharacter);
if (isAfterRTLCharacter || isBeforeRTLCharacter)
{
characterAtThisIndex = '«';
}
}
else if (isAtEnd)
{
bool isAfterRTLCharacter = TextUtils.IsRTLCharacter(nextCharacter);
if (isAfterRTLCharacter)
{
characterAtThisIndex = '«';
}
}
else if (isAtBeginning)
{
bool isBeforeRTLCharacter = TextUtils.IsRTLCharacter(previousCharacter);
if (isBeforeRTLCharacter)
{
characterAtThisIndex = '«';
}
}
}
if (isInMiddle)
{
bool isAfterRTLCharacter = TextUtils.IsRTLCharacter(previousCharacter);
bool isBeforeRTLCharacter = TextUtils.IsRTLCharacter(nextCharacter);
bool isBeforeWhiteSpace = char.IsWhiteSpace(nextCharacter);
bool isAfterWhiteSpace = char.IsWhiteSpace(previousCharacter);
bool isUnderline = characterAtThisIndex == '_';
bool isSpecialPunctuation = characterAtThisIndex == '.' ||
characterAtThisIndex == '،' ||
characterAtThisIndex == '؛';
if (isBeforeRTLCharacter && isAfterRTLCharacter ||
isAfterWhiteSpace && isSpecialPunctuation ||
isBeforeWhiteSpace && isAfterRTLCharacter ||
isBeforeRTLCharacter && isAfterWhiteSpace ||
(isBeforeRTLCharacter || isAfterRTLCharacter) && isUnderline)
{
if (LtrTextHolder.Count > 0)
{
for (int j = 0; j < LtrTextHolder.Count; j++)
{
output.Append(LtrTextHolder[LtrTextHolder.Count - 1 - j]);
}
LtrTextHolder.Clear();
}
output.Append(characterAtThisIndex);
}
else
{
LtrTextHolder.Add(characterAtThisIndex);
}
}
else if (isAtEnd)
{
LtrTextHolder.Add(characterAtThisIndex);
}
else if (isAtBeginning)
{
output.Append(characterAtThisIndex);
}
if (fixTextTags)
{
if (characterAtThisIndex == '<')
{
bool valid = false;
if (isAtBeginning == false)
{
for (int j = i + 1; j < input.Length; j++)
{
// Tags do not have space inside
if (input.Get(j) == ' ')
{
break;
}
// Tags do not have RTL characters inside
if (TextUtils.IsRTLCharacter(input.Get(j)))
{
break;
}
if (input.Get(j) == '>')
{
valid = true;
break;
}
}
}
if (LtrTextHolder.Count > 0 && valid)
{
for (int j = 0; j < LtrTextHolder.Count; j++)
{
output.Append(LtrTextHolder[LtrTextHolder.Count - 1 - j]);
}
LtrTextHolder.Clear();
}
}
}
continue;
}
if (isInMiddle)
{
bool isAfterEnglishChar = TextUtils.IsEnglishLetter(previousCharacter);
bool isBeforeEnglishChar = TextUtils.IsEnglishLetter(nextCharacter);
bool isAfterNumber = TextUtils.IsNumber(previousCharacter, preserveNumbers, farsi);
bool isBeforeNumber = TextUtils.IsNumber(nextCharacter, preserveNumbers, farsi);
bool isAfterSymbol = char.IsSymbol(previousCharacter);
bool isBeforeSymbol = char.IsSymbol(nextCharacter);
// For cases where english words and farsi/arabic are mixed. This allows for using farsi/arabic, english and numbers in one sentence.
// If the space is between numbers,symbols or English words, keep the order
if (characterAtThisIndex == ' ' &&
(isBeforeEnglishChar || isBeforeNumber || isBeforeSymbol) &&
(isAfterEnglishChar || isAfterNumber || isAfterSymbol))
{
LtrTextHolder.Add(characterAtThisIndex);
continue;
}
}
if (TextUtils.IsEnglishLetter(characterAtThisIndex) ||
TextUtils.IsNumber(characterAtThisIndex, preserveNumbers, farsi))
{
LtrTextHolder.Add(characterAtThisIndex);
continue;
}
if (characterAtThisIndex >= (char)0xD800 &&
characterAtThisIndex <= (char)0xDBFF ||
characterAtThisIndex >= (char)0xDC00 && characterAtThisIndex <= (char)0xDFFF)
{
LtrTextHolder.Add(characterAtThisIndex);
continue;
}
if (LtrTextHolder.Count > 0)
{
for (int j = 0; j < LtrTextHolder.Count; j++)
{
output.Append(LtrTextHolder[LtrTextHolder.Count - 1 - j]);
}
LtrTextHolder.Clear();
}
if (characterAtThisIndex != 0xFFFF &&
characterAtThisIndex != (int)GeneralLetters.ZeroWidthNoJoiner)
{
output.Append(characterAtThisIndex);
}
}
if (LtrTextHolder.Count > 0)
{
for (int j = 0; j < LtrTextHolder.Count; j++)
{
output.Append(LtrTextHolder[LtrTextHolder.Count - 1 - j]);
}
LtrTextHolder.Clear();
}
}
public static void FindTag(
FastStringBuilder str,
int start,
out int tagStart,
out int tagEnd,
out int tagType,
out int hashCode)
{
for (int i = start; i < str.Length;)
{
if (str.Get(i) != '<')
{
i++;
continue;
}
bool calculateHashCode = true;
hashCode = 0;
for (int j = i + 1; j < str.Length; j++)
{
char jChar = str.Get(j);
if (calculateHashCode)
{
if (char.IsLetter(jChar))
{
unchecked
{
if (hashCode == 0)
{
hashCode = jChar.GetHashCode();
}
else
{
hashCode = (hashCode * 397) ^ jChar.GetHashCode();
}
}
}
else if (hashCode != 0)
{
// We have computed the hash code. Now we reached a non letter character. We need to stop
calculateHashCode = false;
}
}
// Rich text tag cannot contain RTL chars
if (TextUtils.IsRTLCharacter(jChar))
{
break;
}
if (jChar == '>')
{
// Check if the tag is closing, opening or self contained
tagStart = i;
tagEnd = j + 1;
if (str.Get(j - 1) == '/')
{
// This is self contained.
tagType = 3;
return;
}
if (str.Get(i + 1) == '/')
{
// This is closing
tagType = 2;
return;
}
tagType = 1;
return;
}
}
i++;
}
tagStart = 0;
tagEnd = 0;
tagType = 0;
hashCode = 0;
}
/// <summary>
/// Fixes rich text tags in input string and returns the result.
/// </summary>
public static void Fix(FastStringBuilder text)
{
for (int i = 0; i < text.Length; i++)
{
FindTag(text, i, out int tagStart, out int tagEnd, out int tagType, out int hashCode);
// If we couldn't find a tag, end the process
if (tagType == 0)
{
break;
}
switch (tagType)
{
case 1: // Opening tag
{
Tag closingTag = default;
// Search and find the closing tag for this
bool foundClosingTag = false;
for (int j = ClosedTagsHash.Count - 1; j >= 0; j--)
{
if (ClosedTagsHash[j] == hashCode)
{
closingTag = ClosedTags[j];
foundClosingTag = true;
ClosedTags.RemoveAt(j);
ClosedTagsHash.RemoveAt(j);
break;
}
}
if (foundClosingTag)
{
// NOTE: order of execution is important here
int openingTagLength = tagEnd - tagStart;
int closingTagLength = closingTag.End - closingTag.Start;
text.Reverse(tagStart, openingTagLength);
text.Reverse(closingTag.Start, closingTagLength);
}
else
{
text.Reverse(tagStart, tagEnd - tagStart);
}
break;
}
case 2: // Closing tag
{
ClosedTags.Add(new Tag(tagStart, tagEnd));
ClosedTagsHash.Add(hashCode);
break;
}
case 3: // Self contained tag
{
text.Reverse(tagStart, tagEnd - tagStart);
break;
}
}
i = tagEnd;
}
}
static RTLSupport()
{
inputBuilder = new FastStringBuilder(DefaultBufferSize);
glyphFixerOutput = new FastStringBuilder(DefaultBufferSize);
}
public void Replace(FastStringBuilder oldStr, FastStringBuilder newStr)
{
for (int i = 0; i < length; i++)
{
bool match = true;
for (int j = 0; j < oldStr.Length; j++)
{
if (array[i + j] != oldStr.Get(j))
{
match = false;
break;
}
}
if (!match)
{
continue;
}
if (oldStr.Length == newStr.Length)
{
for (int k = 0; k < oldStr.Length; k++)
{
array[i + k] = newStr.Get(k);
}
}
else if (oldStr.Length < newStr.Length)
{
// We need to expand capacity
int diff = newStr.Length - oldStr.Length;
length += diff;
EnsureCapacity(length, true);
// Move everything forward by difference of length
for (int k = length - diff - 1; k >= i + oldStr.Length; k--)
{
array[k + diff] = array[k];
}
// Start writing new string
for (int k = 0; k < newStr.Length; k++)
{
array[i + k] = newStr.Get(k);
}
}
else
{
// We need to shrink
int diff = oldStr.Length - newStr.Length;
// Move everything backwards by diff
for (int k = i + diff; k < length - diff; k++)
{
array[k] = array[k + diff];
}
for (int k = 0; k < newStr.Length; k++)
{
array[i + k] = newStr.Get(k);
}
length -= diff;
}
i += newStr.Length;
}
}
/// <summary>
/// Fixes the shape of letters based on their position.
/// </summary>
/// <param name="input"></param>
/// <param name="output"></param>
/// <param name="preserveNumbers"></param>
/// <param name="farsi"></param>
/// <returns></returns>
public static void Fix(FastStringBuilder input, FastStringBuilder output, bool preserveNumbers, bool farsi, bool fixTextTags)
{
FixYah(input, farsi);
output.SetValue(input);
for (int i = 0; i < input.Length; i++)
{
bool skipNext = false;
int iChar = input.Get(i);
// For special Lam Letter connections.
if (iChar == (int)ArabicGeneralLetters.Lam)
{
if (i < input.Length - 1)
{
skipNext = HandleSpecialLam(input, output, i);
if (skipNext)
{
iChar = output.Get(i);
}
}
}
// We don't want to fix tatweel or zwnj character
if (iChar == (int)ArabicGeneralLetters.ArabicTatweel ||
iChar == (int)ArabicGeneralLetters.ZeroWidthNoJoiner)
{
continue;
}
if (iChar < 0xFFFF && TextUtils.IsGlyphFixedArabicCharacter((char)iChar))
{
char converted = GlyphTable.Convert((char)iChar);
if (IsMiddleLetter(input, i))
{
output.Set(i, (char)(converted + 3));
}
else if (IsFinishingLetter(input, i))
{
output.Set(i, (char)(converted + 1));
}
else if (IsLeadingLetter(input, i))
{
output.Set(i, (char)(converted + 2));
}
}
// If this letter as Lam and special Lam-Alef connection was made, We want to skip the Alef
// (Lam-Alef occupies 1 space)
if (skipNext)
{
i++;
}
}
if (!preserveNumbers)
{
if (fixTextTags)
{
FixNumbersOutsideOfTags(output, farsi);
}
else
{
FixNumbers(output, farsi);
}
}
}
/// <summary>
/// Removes tashkeel from text.
/// </summary>
public static void RemoveTashkeel(FastStringBuilder input)
{
for (int i = 0; i < input.Length; i++)
{
switch ((TashkeelCharacters)input.Get(i))
{
case TashkeelCharacters.Fathan:
TashkeelLocations.Add(new TashkeelLocation(TashkeelCharacters.Fathan, i));
break;
case TashkeelCharacters.Dammatan:
TashkeelLocations.Add(new TashkeelLocation(TashkeelCharacters.Dammatan, i));
break;
case TashkeelCharacters.Kasratan:
TashkeelLocations.Add(new TashkeelLocation(TashkeelCharacters.Kasratan, i));
break;
case TashkeelCharacters.Fatha:
TashkeelLocations.Add(new TashkeelLocation(TashkeelCharacters.Fatha, i));
break;
case TashkeelCharacters.Damma:
TashkeelLocations.Add(new TashkeelLocation(TashkeelCharacters.Damma, i));
break;
case TashkeelCharacters.Kasra:
TashkeelLocations.Add(new TashkeelLocation(TashkeelCharacters.Kasra, i));
break;
case TashkeelCharacters.Shadda:
TashkeelLocations.Add(new TashkeelLocation(TashkeelCharacters.Shadda, i));
break;
case TashkeelCharacters.Sukun:
TashkeelLocations.Add(new TashkeelLocation(TashkeelCharacters.Sukun, i));
break;
case TashkeelCharacters.MaddahAbove:
TashkeelLocations.Add(
new TashkeelLocation(TashkeelCharacters.MaddahAbove, i));
break;
case TashkeelCharacters.SuperscriptAlef:
TashkeelLocations.Add(
new TashkeelLocation(TashkeelCharacters.SuperscriptAlef, i));
break;
}
}
input.RemoveAll((char)TashkeelCharacters.Fathan);
input.RemoveAll((char)TashkeelCharacters.Dammatan);
input.RemoveAll((char)TashkeelCharacters.Kasratan);
input.RemoveAll((char)TashkeelCharacters.Fatha);
input.RemoveAll((char)TashkeelCharacters.Damma);
input.RemoveAll((char)TashkeelCharacters.Kasra);
input.RemoveAll((char)TashkeelCharacters.Shadda);
input.RemoveAll((char)TashkeelCharacters.Sukun);
input.RemoveAll((char)TashkeelCharacters.MaddahAbove);
input.RemoveAll((char)TashkeelCharacters.ShaddaWithFathaIsolatedForm);
input.RemoveAll((char)TashkeelCharacters.ShaddaWithDammaIsolatedForm);
input.RemoveAll((char)TashkeelCharacters.ShaddaWithKasraIsolatedForm);
input.RemoveAll((char)TashkeelCharacters.SuperscriptAlef);
}
/// <summary>
/// Is the letter at provided index a leading letter?
/// </summary>
/// <returns><see langword="true" /> if the letter is a leading letter</returns>
private static bool IsLeadingLetter(FastStringBuilder letters, int index)
{
var currentIndexLetter = letters.Get(index);
int previousIndexLetter = default;
if (index != 0)
{
previousIndexLetter = letters.Get(index - 1);
}
int nextIndexLetter = default;
if (index < letters.Length - 1)
{
nextIndexLetter = letters.Get(index + 1);
}
bool isPreviousLetterNonConnectable = index == 0 ||
(previousIndexLetter < 0xFFFF && !TextUtils.IsGlyphFixedArabicCharacter((char)previousIndexLetter)) ||
previousIndexLetter == (int)ArabicGeneralLetters.Alef ||
previousIndexLetter == (int)ArabicGeneralLetters.Dal ||
previousIndexLetter == (int)ArabicGeneralLetters.Thal ||
previousIndexLetter == (int)ArabicGeneralLetters.Ra2 ||
previousIndexLetter == (int)ArabicGeneralLetters.Zeen ||
previousIndexLetter == (int)ArabicGeneralLetters.PersianZe ||
previousIndexLetter == (int)ArabicGeneralLetters.Waw ||
previousIndexLetter == (int)ArabicGeneralLetters.AlefMad ||
previousIndexLetter == (int)ArabicGeneralLetters.AlefHamza ||
previousIndexLetter == (int)ArabicGeneralLetters.Hamza ||
previousIndexLetter == (int)ArabicGeneralLetters.AlefMaksoor ||
previousIndexLetter == (int)ArabicGeneralLetters.ZeroWidthNoJoiner ||
previousIndexLetter == (int)ArabicGeneralLetters.WawHamza ||
previousIndexLetter == (int)ArabicIsolatedLetters.Alef ||
previousIndexLetter == (int)ArabicIsolatedLetters.Dal ||
previousIndexLetter == (int)ArabicIsolatedLetters.Thal ||
previousIndexLetter == (int)ArabicIsolatedLetters.Ra2 ||
previousIndexLetter == (int)ArabicIsolatedLetters.Zeen ||
previousIndexLetter == (int)ArabicIsolatedLetters.PersianZe ||
previousIndexLetter == (int)ArabicIsolatedLetters.Waw ||
previousIndexLetter == (int)ArabicIsolatedLetters.AlefMad ||
previousIndexLetter == (int)ArabicIsolatedLetters.AlefHamza ||
previousIndexLetter == (int)ArabicIsolatedLetters.Hamza ||
previousIndexLetter == (int)ArabicIsolatedLetters.AlefMaksoor;
bool canThisLetterBeLeading = currentIndexLetter != ' ' &&
currentIndexLetter != (int)ArabicGeneralLetters.Dal &&
currentIndexLetter != (int)ArabicGeneralLetters.Thal &&
currentIndexLetter != (int)ArabicGeneralLetters.Ra2 &&
currentIndexLetter != (int)ArabicGeneralLetters.Zeen &&
currentIndexLetter != (int)ArabicGeneralLetters.PersianZe &&
currentIndexLetter != (int)ArabicGeneralLetters.Alef &&
currentIndexLetter != (int)ArabicGeneralLetters.AlefHamza &&
currentIndexLetter != (int)ArabicGeneralLetters.AlefMaksoor &&
currentIndexLetter != (int)ArabicGeneralLetters.AlefMad &&
currentIndexLetter != (int)ArabicGeneralLetters.WawHamza &&
currentIndexLetter != (int)ArabicGeneralLetters.Waw &&
currentIndexLetter != (int)ArabicGeneralLetters.ZeroWidthNoJoiner &&
currentIndexLetter != (int)ArabicGeneralLetters.Hamza;
bool isNextLetterConnectable = index < letters.Length - 1 &&
(nextIndexLetter < 0xFFFF && TextUtils.IsGlyphFixedArabicCharacter((char)nextIndexLetter)) &&
nextIndexLetter != (int)ArabicGeneralLetters.Hamza &&
nextIndexLetter != (int)ArabicGeneralLetters.ZeroWidthNoJoiner;
return(isPreviousLetterNonConnectable &&
canThisLetterBeLeading &&
isNextLetterConnectable);
}
/// <summary>
/// Fixes the flow of the text.
/// </summary>
public static void Fix(FastStringBuilder input, FastStringBuilder output, bool farsi, bool fixTextTags, bool preserveNumbers)
{
// Some texts like tags, English words and numbers need to be displayed in their original order.
// This list keeps the characters that their order should be reserved and streams reserved texts into final letters.
LtrTextHolder.Clear();
TagTextHolder.Clear();
for (int i = input.Length - 1; i >= 0; i--)
{
bool isInMiddle = i > 0 && i < input.Length - 1;
bool isAtBeginning = i == 0;
bool isAtEnd = i == input.Length - 1;
char characterAtThisIndex = input.Get(i);
char nextCharacter = default;
if (!isAtEnd)
{
nextCharacter = input.Get(i + 1);
}
char previousCharacter = default;
if (!isAtBeginning)
{
previousCharacter = input.Get(i - 1);
}
if (fixTextTags)
{
if (characterAtThisIndex == '>')
{
// We need to check if it is actually the beginning of a tag.
bool isValidTag = false;
int nextI = i;
TagTextHolder.Add(characterAtThisIndex);
for (int j = i - 1; j >= 0; j--)
{
var jChar = input.Get(j);
// Tags do not have space inside
if (jChar == ' ')
{
break;
}
// Tags do not have RTL characters inside
if (TextUtils.IsRTLCharacter(jChar))
{
break;
}
TagTextHolder.Add(jChar);
if (jChar == '<')
{
isValidTag = true;
nextI = j;
break;
}
}
if (isValidTag)
{
FlushBufferToOutput(LtrTextHolder, output);
FlushBufferToOutput(TagTextHolder, output);
i = nextI;
continue;
}
else
{
TagTextHolder.Clear();
}
}
}
if (char.IsPunctuation(characterAtThisIndex) || char.IsSymbol(characterAtThisIndex))
{
if (MirroredCharsSet.Contains(characterAtThisIndex))
{
// IsRTLCharacter returns false for null
bool isAfterRTLCharacter = TextUtils.IsRTLCharacter(previousCharacter);
bool isBeforeRTLCharacter = TextUtils.IsRTLCharacter(nextCharacter);
if (isAfterRTLCharacter || isBeforeRTLCharacter)
{
characterAtThisIndex = MirroredCharsMap[characterAtThisIndex];
}
}
if (isInMiddle)
{
bool isAfterRTLCharacter = TextUtils.IsRTLCharacter(previousCharacter);
bool isBeforeRTLCharacter = TextUtils.IsRTLCharacter(nextCharacter);
bool isBeforeWhiteSpace = char.IsWhiteSpace(nextCharacter);
bool isAfterWhiteSpace = char.IsWhiteSpace(previousCharacter);
bool isUnderline = characterAtThisIndex == '_';
bool isSpecialPunctuation = characterAtThisIndex == '.' ||
characterAtThisIndex == '،' ||
characterAtThisIndex == '؛';
if (isBeforeRTLCharacter && isAfterRTLCharacter ||
isAfterWhiteSpace && isSpecialPunctuation ||
isBeforeWhiteSpace && isAfterRTLCharacter ||
isBeforeRTLCharacter && isAfterWhiteSpace ||
(isBeforeRTLCharacter || isAfterRTLCharacter) && isUnderline)
{
FlushBufferToOutput(LtrTextHolder, output);
output.Append(characterAtThisIndex);
}
else
{
LtrTextHolder.Add(characterAtThisIndex);
}
}
else if (isAtEnd)
{
LtrTextHolder.Add(characterAtThisIndex);
}
else if (isAtBeginning)
{
output.Append(characterAtThisIndex);
}
continue;
}
if (isInMiddle)
{
bool isAfterEnglishChar = TextUtils.IsEnglishLetter(previousCharacter);
bool isBeforeEnglishChar = TextUtils.IsEnglishLetter(nextCharacter);
bool isAfterNumber = TextUtils.IsNumber(previousCharacter, preserveNumbers, farsi);
bool isBeforeNumber = TextUtils.IsNumber(nextCharacter, preserveNumbers, farsi);
bool isAfterSymbol = char.IsSymbol(previousCharacter);
bool isBeforeSymbol = char.IsSymbol(nextCharacter);
// For cases where english words and farsi/arabic are mixed. This allows for using farsi/arabic, english and numbers in one sentence.
// If the space is between numbers,symbols or English words, keep the order
if (characterAtThisIndex == ' ' &&
(isBeforeEnglishChar || isBeforeNumber || isBeforeSymbol) &&
(isAfterEnglishChar || isAfterNumber || isAfterSymbol))
{
LtrTextHolder.Add(characterAtThisIndex);
continue;
}
}
if (TextUtils.IsEnglishLetter(characterAtThisIndex) ||
TextUtils.IsNumber(characterAtThisIndex, preserveNumbers, farsi))
{
LtrTextHolder.Add(characterAtThisIndex);
continue;
}
if (characterAtThisIndex >= (char)0xD800 &&
characterAtThisIndex <= (char)0xDBFF ||
characterAtThisIndex >= (char)0xDC00 && characterAtThisIndex <= (char)0xDFFF)
{
LtrTextHolder.Add(characterAtThisIndex);
continue;
}
FlushBufferToOutput(LtrTextHolder, output);
if (characterAtThisIndex != 0xFFFF &&
characterAtThisIndex != (int)GeneralLetters.ZeroWidthNoJoiner)
{
output.Append(characterAtThisIndex);
}
}
FlushBufferToOutput(LtrTextHolder, output);
}
/// <summary>
/// Is the letter at provided index a middle letter?
/// </summary>
/// <returns><see langword="true" /> if the letter is a middle letter</returns>
private static bool IsMiddleLetter(FastStringBuilder letters, int index)
{
var currentIndexLetter = letters.Get(index);
int previousIndexLetter = default;
if (index != 0)
{
previousIndexLetter = letters.Get(index - 1);
}
int nextIndexLetter = default;
if (index < letters.Length - 1)
{
nextIndexLetter = letters.Get(index + 1);
}
bool middleLetterCheck = index != 0 &&
currentIndexLetter != (int)ArabicGeneralLetters.Alef &&
currentIndexLetter != (int)ArabicGeneralLetters.Dal &&
currentIndexLetter != (int)ArabicGeneralLetters.Thal &&
currentIndexLetter != (int)ArabicGeneralLetters.Ra2 &&
currentIndexLetter != (int)ArabicGeneralLetters.Zeen &&
currentIndexLetter != (int)ArabicGeneralLetters.PersianZe &&
currentIndexLetter != (int)ArabicGeneralLetters.Waw &&
currentIndexLetter != (int)ArabicGeneralLetters.AlefMad &&
currentIndexLetter != (int)ArabicGeneralLetters.AlefHamza &&
currentIndexLetter != (int)ArabicGeneralLetters.AlefMaksoor &&
currentIndexLetter != (int)ArabicGeneralLetters.WawHamza &&
currentIndexLetter != (int)ArabicGeneralLetters.ZeroWidthNoJoiner &&
currentIndexLetter != (int)ArabicGeneralLetters.Hamza;
bool previousLetterCheck = index != 0 &&
previousIndexLetter != (int)ArabicGeneralLetters.Alef &&
previousIndexLetter != (int)ArabicGeneralLetters.Dal &&
previousIndexLetter != (int)ArabicGeneralLetters.Thal &&
previousIndexLetter != (int)ArabicGeneralLetters.Ra2 &&
previousIndexLetter != (int)ArabicGeneralLetters.Zeen &&
previousIndexLetter != (int)ArabicGeneralLetters.PersianZe &&
previousIndexLetter != (int)ArabicGeneralLetters.Waw &&
previousIndexLetter != (int)ArabicGeneralLetters.AlefMad &&
previousIndexLetter != (int)ArabicGeneralLetters.AlefHamza &&
previousIndexLetter != (int)ArabicGeneralLetters.AlefMaksoor &&
previousIndexLetter != (int)ArabicGeneralLetters.WawHamza &&
previousIndexLetter != (int)ArabicGeneralLetters.Hamza &&
previousIndexLetter != (int)ArabicGeneralLetters.ZeroWidthNoJoiner &&
previousIndexLetter != (int)ArabicIsolatedLetters.Alef &&
previousIndexLetter != (int)ArabicIsolatedLetters.Dal &&
previousIndexLetter != (int)ArabicIsolatedLetters.Thal &&
previousIndexLetter != (int)ArabicIsolatedLetters.Ra2 &&
previousIndexLetter != (int)ArabicIsolatedLetters.Zeen &&
previousIndexLetter != (int)ArabicIsolatedLetters.PersianZe &&
previousIndexLetter != (int)ArabicIsolatedLetters.Waw &&
previousIndexLetter != (int)ArabicIsolatedLetters.AlefMad &&
previousIndexLetter != (int)ArabicIsolatedLetters.AlefHamza &&
previousIndexLetter != (int)ArabicIsolatedLetters.AlefMaksoor &&
previousIndexLetter != (int)ArabicIsolatedLetters.WawHamza &&
previousIndexLetter != (int)ArabicIsolatedLetters.Hamza &&
(previousIndexLetter < 0xFFFF && TextUtils.IsGlyphFixedArabicCharacter((char)previousIndexLetter));
bool nextLetterCheck = index < letters.Length - 1 &&
(nextIndexLetter < 0xFFFF && TextUtils.IsGlyphFixedArabicCharacter((char)nextIndexLetter)) &&
nextIndexLetter != (int)ArabicGeneralLetters.ZeroWidthNoJoiner &&
nextIndexLetter != (int)ArabicGeneralLetters.Hamza &&
nextIndexLetter != (int)ArabicIsolatedLetters.Hamza;
return(nextLetterCheck && previousLetterCheck && middleLetterCheck);
}