public static IEnumerable <UChar> Filter(IEnumerable <UChar> inputStream)
{
bool enabled = false;
UChar prev = nul;
foreach (var c in inputStream)
{
if (enabled)
{
if (c == close)
{
if (prev != nul)
{
yield return(prev);
prev = nul;
}
enabled = false;
}
else if (c == lf)
{
if (prev != nul)
{
yield return(prev);
prev = nul;
}
yield return(lf);
enabled = false;
}
else if (c == circumflex)
{
switch (prev.CodePoint)
{
/* circumflex */
case 0x0041: //'A'
yield return(UChar.FromCodePoint(0x00C2));
break;
case 0x0061: //'a'
yield return(UChar.FromCodePoint(0x00E2));
break;
case 0x0043: //'C'
yield return(UChar.FromCodePoint(0x0108));
break;
case 0x0063: //'c'
yield return(UChar.FromCodePoint(0x0109));
break;
case 0x0045: //'E'
yield return(UChar.FromCodePoint(0x00CA));
break;
case 0x0065: //'e'
yield return(UChar.FromCodePoint(0x00EA));
break;
case 0x0047: //'G'
yield return(UChar.FromCodePoint(0x011C));
break;
case 0x0067: //'g'
yield return(UChar.FromCodePoint(0x011D));
break;
case 0x0048: //'H'
yield return(UChar.FromCodePoint(0x0124));
break;
case 0x0068: //'h'
yield return(UChar.FromCodePoint(0x0125));
break;
case 0x0049: //'I'
yield return(UChar.FromCodePoint(0x00CE));
break;
case 0x0069: //'i'
yield return(UChar.FromCodePoint(0x00EE));
break;
case 0x004A: //'J'
yield return(UChar.FromCodePoint(0x0134));
break;
case 0x006A: //'j'
yield return(UChar.FromCodePoint(0x0135));
break;
case 0x004E: //'N'
yield return(UChar.FromCodePoint(0x004E));
yield return(UChar.FromCodePoint(0x0302));
break;
case 0x006E: //'n'
yield return(UChar.FromCodePoint(0x006E));
yield return(UChar.FromCodePoint(0x0302));
break;
case 0x004F: //'O'
yield return(UChar.FromCodePoint(0x00D4));
break;
case 0x006F: //'o'
yield return(UChar.FromCodePoint(0x00F4));
break;
case 0x0053: //'S'
yield return(UChar.FromCodePoint(0x015C));
break;
case 0x0073: //'s'
yield return(UChar.FromCodePoint(0x015D));
break;
case 0x0057: //'W'
yield return(UChar.FromCodePoint(0x0174));
break;
case 0x0077: //'w'
yield return(UChar.FromCodePoint(0x0175));
break;
case 0x0059: //'Y'
yield return(UChar.FromCodePoint(0x0176));
break;
case 0x0079: //'y'
yield return(UChar.FromCodePoint(0x0177));
break;
case 0x005A: //'Z'
yield return(UChar.FromCodePoint(0x1E90));
break;
case 0x007A: //'z'
yield return(UChar.FromCodePoint(0x1E91));
break;
default:
yield return(prev);
yield return(c);
break;
}
;
prev = nul;
}
else if (c == acute)
{
switch (prev.CodePoint)
{
/* acute */
case 0x0041: //'A'
yield return(UChar.FromCodePoint(0x00C1));
break;
case 0x0061: //'a'
yield return(UChar.FromCodePoint(0x00E1));
break;
case 0x0045: //'E'
yield return(UChar.FromCodePoint(0x00C9));
break;
case 0x0065: //'e'
yield return(UChar.FromCodePoint(0x00E9));
break;
case 0x0049: //'I'
yield return(UChar.FromCodePoint(0x00CD));
break;
case 0x0069: //'i'
yield return(UChar.FromCodePoint(0x00ED));
break;
case 0x004F: //'O'
yield return(UChar.FromCodePoint(0x00D3));
break;
case 0x006F: //'o'
yield return(UChar.FromCodePoint(0x00F3));
break;
case 0x0055: //'U'
yield return(UChar.FromCodePoint(0x00DA));
break;
case 0x0075: //'u'
yield return(UChar.FromCodePoint(0x00FA));
break;
default:
yield return(prev);
yield return(c);
break;
}
;
prev = nul;
}
else if (c == tilde)
{
switch (prev.CodePoint)
{
/* tilde */
case 0x0041: //'A'
yield return(UChar.FromCodePoint(0x00C3));
break;
case 0x0061: //'a'
yield return(UChar.FromCodePoint(0x00E3));
break;
case 0x004E: //'N'
yield return(UChar.FromCodePoint(0x00D1));
break;
case 0x006E: //'n'
yield return(UChar.FromCodePoint(0x00F1));
break;
case 0x004F: //'O'
yield return(UChar.FromCodePoint(0x00D5));
break;
case 0x006F: //'o'
yield return(UChar.FromCodePoint(0x00F5));
break;
default:
yield return(prev);
yield return(c);
break;
}
;
prev = nul;
}
else if (c == atmark && prev.CodePoint == 0x003F)
{
//INVERTED QUESTION MARK
yield return(UChar.FromCodePoint(0x00BF));
prev = nul;
}
else
{
if (prev != nul)
{
yield return(prev);
}
prev = c;
}
}
else
{
if (c == open)
{
enabled = true;
}
else
{
yield return(c);
}
}
}
}
public static IEnumerable <UChar> Filter(IEnumerable <UChar> inputStream)
{
State state = State.Normal;
foreach (UChar c in inputStream)
{
switch (state)
{
case State.Normal:
if (c == UpperHalfChar)
{
state = State.UpperHalf;
}
else
{
yield return(c);
}
break;
case State.UpperHalf:
if (c == DownerHalfChar)
{
yield return(UChar.FromCodePoint(0x3033));
yield return(UChar.FromCodePoint(0x3035));
state = State.Normal;
}
else if (c == VoicingChar)
{
state = State.UpperHalfVoiced;
}
else
{
yield return(UpperHalfChar);
if (c == UpperHalfChar)
{
state = State.UpperHalf;
}
else
{
yield return(c);
state = State.Normal;
}
}
break;
case State.UpperHalfVoiced:
if (c == DownerHalfChar)
{
yield return(UChar.FromCodePoint(0x3034));
yield return(UChar.FromCodePoint(0x3035));
state = State.Normal;
}
else
{
yield return(UpperHalfChar);
if (c == UpperHalfChar)
{
state = State.UpperHalf;
}
else
{
yield return(c);
state = State.Normal;
}
}
break;
}
}
}
