private List <Run> Itemize(string s, bool rtl, int maxItems)
{
SCRIPT_ITEM[] pItems = new SCRIPT_ITEM[maxItems];
int pcItems = 0;
// initialize Control and State
SCRIPT_CONTROL control = new SCRIPT_CONTROL();
SCRIPT_STATE state = new SCRIPT_STATE();
if (rtl)
{
// this is needed to start paragraph from right
state.SetRtl();
// to substitute arabic digits
ScriptApplyDigitSubstitution(ref FDigitSubstitute, ref control, ref state);
}
// itemize
ScriptItemize(s, s.Length, pItems.Length, ref control, ref state, pItems, ref pcItems);
// create Run list. Note that ScriptItemize actually returns pcItems+1 items,
// so this can be used to calculate char range easily
List <Run> list = new List <Run>();
for (int i = 0; i < pcItems; i++)
{
string text = s.Substring(pItems[i].iCharPos, pItems[i + 1].iCharPos - pItems[i].iCharPos);
list.Add(new Run(text, pItems[i].analysis));
}
return(list);
}
public SCRIPT_STATE GetAs_SCRIPT_STATE()
{
SCRIPT_STATE result = default(SCRIPT_STATE);
result.word1 = (ushort)((this.uBidiLevel & 0x1F) | (this.fOverrideDirection & 1) << 5 | (this.fInhibitSymSwap & 1) << 6 | (this.fCharShape & 1) << 7 | (this.fDigitSubstitute & 1) << 8 | (this.fInhibitLigate & 1) << 9 | (this.fDisplayZWG & 1) << 10 | (this.fArabicNumContext & 1) << 11 | (this.fGcpClusters & 1) << 12 | (this.fReserved & 1) << 13 | (this.fEngineReserved & 3) << 14);
return(result);
}
internal SCRIPT_STATE GetAs_SCRIPT_STATE()
{
SCRIPT_STATE result = default(SCRIPT_STATE);
result.word1 = (ushort)((uBidiLevel & 0x1F) | ((fOverrideDirection & 1) << 5) | ((fInhibitSymSwap & 1) << 6) | ((fCharShape & 1) << 7) | ((fDigitSubstitute & 1) << 8) | ((fInhibitLigate & 1) << 9) | ((fDisplayZWG & 1) << 10) | ((fArabicNumContext & 1) << 11) | ((fGcpClusters & 1) << 12) | ((fReserved & 1) << 13) | ((fEngineReserved & 3) << 14));
return(result);
}
public static extern uint ScriptItemize(
[MarshalAs(UnmanagedType.LPWStr)] string pwcInChars,
int cInChars,
int cMaxItems,
ref SCRIPT_CONTROL psControl,
ref SCRIPT_STATE psState,
[In, Out] SCRIPT_ITEM[] pItems,
ref int pcItems
);
private static extern int ScriptApplyDigitSubstitution(
ref SCRIPT_DIGITSUBSTITUTE psds, ref SCRIPT_CONTROL psc, ref SCRIPT_STATE pss);
/// <summary>
/// Converts visual string to logical.
/// </summary>
/// <param name="value">A value to convert.</param>
/// <param name="rtl">A base direction.</param>
/// <param name="direction">
/// true for visual to logical, and false for logical to visual.
/// </param>
/// <returns>Converted string.</returns>
public static string Convert(string value, bool rtl, bool direction)
{
if (value == null)
{
return(null);
}
int count = value.Length;
if (count <= 1)
{
return(value);
}
if (NativeMethods.ScriptIsComplex(
value,
count,
Constants.SIC_COMPLEX | Constants.SIC_NEUTRAL) !=
Constants.S_OK)
{
return(value);
}
var control = new SCRIPT_CONTROL();
var state = new SCRIPT_STATE();
int resultCount = 0;
int maxCount = count + 1;
//control.fInvertPreBoundDir = rtl ? 1 : 0;
//control.fInvertPostBoundDir = rtl ? 1 : 0;
state.uBidiLevel = rtl ? (ushort)1 : (ushort)0;
var items = new SCRIPT_ITEM[maxCount];
if (NativeMethods.ScriptItemize(
value,
count,
maxCount,
ref control,
ref state,
items,
out resultCount) != 0)
{
return(value);
}
byte[] levels = new byte[count];
for (int i = 0; i < resultCount; i++)
{
var level = items[i].a.s.uBidiLevel;
for (int j = items[i].iCharPos, k = items[i + 1].iCharPos; j < k; j++)
{
levels[j] = (byte)level;
}
}
var orders = new int[count];
if (NativeMethods.ScriptLayout(count, levels, orders, null) != 0)
{
return(value);
}
var result = new char[count];
for (int i = 0; i < count; i++)
{
var index = orders[i];
var c = value[index];
var level = levels[index];
if (direction && ((level & 1) == 1))
{
// Minimal mirroring.
switch (c)
{
case '{':
{
c = '}';
break;
}
case '}':
{
c = '{';
break;
}
case '(':
{
c = ')';
break;
}
case ')':
{
c = '(';
break;
}
case '<':
{
c = '>';
break;
}
case '>':
{
c = '<';
break;
}
}
}
result[i] = c;
}
return(new string(result, 0, count));
}
/// <summary>
/// Converts visual string to logical.
/// </summary>
/// <param name="value">A value to convert.</param>
/// <param name="rtl">A base direction.</param>
/// <param name="direction">
/// true for visual to logical, and false for logical to visual.
/// </param>
/// <returns>Converted string.</returns>
public static string Convert(string value, bool rtl, bool direction)
{
if (value == null)
{
return null;
}
int count = value.Length;
if (count <= 1)
{
return value;
}
if (NativeMethods.ScriptIsComplex(
value,
count,
Constants.SIC_COMPLEX | Constants.SIC_NEUTRAL) !=
Constants.S_OK)
{
return value;
}
var control = new SCRIPT_CONTROL();
var state = new SCRIPT_STATE();
int resultCount = 0;
int maxCount = count + 1;
//control.fInvertPreBoundDir = rtl ? 1 : 0;
//control.fInvertPostBoundDir = rtl ? 1 : 0;
state.uBidiLevel = rtl ? (ushort)1 : (ushort)0;
var items = new SCRIPT_ITEM[maxCount];
if (NativeMethods.ScriptItemize(
value,
count,
maxCount,
ref control,
ref state,
items,
out resultCount) != 0)
{
return value;
}
byte[] levels = new byte[count];
for(int i = 0; i < resultCount; i++)
{
var level = items[i].a.s.uBidiLevel;
for(int j = items[i].iCharPos, k = items[i + 1].iCharPos; j < k; j++)
{
levels[j] = (byte)level;
}
}
var orders = new int[count];
if (NativeMethods.ScriptLayout(count, levels, orders, null) != 0)
{
return value;
}
var result = new char[count];
for(int i = 0; i < count; i++)
{
var index = orders[i];
var c = value[index];
var level = levels[index];
if (direction && ((level & 1) == 1))
{
// Minimal mirroring.
switch(c)
{
case '{':
{
c = '}';
break;
}
case '}':
{
c = '{';
break;
}
case '(':
{
c = ')';
break;
}
case ')':
{
c = '(';
break;
}
case '<':
{
c = '>';
break;
}
case '>':
{
c = '<';
break;
}
}
}
result[i] = c;
}
return new string(result, 0, count);
}
