internal LsErr GetPrevHyphenOpp(
IntPtr pols, // Line Layout context
int lscpStartSearch, // LSCP to start search for hyphen opportunity
int lsdcpSearch, // number of LSCP to look for the hyphen opportunity
ref int fHyphenFound, // [out] hyphen found
ref int lscpHyphen, // [out] LSCP of character before hyphen
ref LsHyph lsHyph // [out] hyphen info
)
{
LsErr lserr = LsErr.None;
try
{
fHyphenFound = FullText.FindNextHyphenBreak(
lscpStartSearch + 1,
-lsdcpSearch,
false, // !isCurrentAtWordStart
ref lscpHyphen,
ref lsHyph
) ? 1 : 0;
Invariant.Assert(fHyphenFound == 0 || (lscpHyphen > lscpStartSearch - lsdcpSearch && lscpHyphen <= lscpStartSearch));
}
catch (Exception e)
{
SaveException(e, Plsrun.Undefined, null);
lserr = LsErr.ClientAbort;
}
catch
{
SaveNonCLSException("GetPrevHyphenOpp", Plsrun.Undefined, null);
lserr = LsErr.ClientAbort;
}
return lserr;
}
/// <summary>
/// Find the hyphen break following or preceding the specified current LSCP
/// </summary>
/// <remarks>
/// This method never checks whether the specified current LSCP is already right
/// at a hyphen break. It either finds the next or the previous break regardless.
///
/// A negative lscchLim param value indicates the caller finds the hyphen immediately
/// before the specified character index.
/// </remarks>
/// <param name="lscpCurrent">the current LSCP</param>
/// <param name="lscchLim">the number of LSCP to search for break</param>
/// <param name="isCurrentAtWordStart">flag indicates whether lscpCurrent is the beginning of the word to hyphenate</param>
/// <param name="lscpHyphen">LSCP of the hyphen</param>
/// <param name="lshyph">Hyphen properties</param>
internal bool FindNextHyphenBreak(
int lscpCurrent,
int lscchLim,
bool isCurrentAtWordStart,
ref int lscpHyphen,
ref LsHyph lshyph
)
{
lshyph = new LsHyph(); // no additional hyphen properties for now
if (_store.Pap.Hyphenator != null)
{
int lscpChunk;
int lscchChunk;
LexicalChunk chunk = GetChunk(
_store.Pap.Hyphenator,
lscpCurrent,
lscchLim,
isCurrentAtWordStart,
out lscpChunk,
out lscchChunk
);
_lscpHyphenationLookAhead = lscpChunk + lscchChunk;
if (!chunk.IsNoBreak)
{
int ichCurrent = chunk.LSCPToCharacterIndex(lscpCurrent - lscpChunk);
int ichLim = chunk.LSCPToCharacterIndex(lscpCurrent + lscchLim - lscpChunk);
if (lscchLim >= 0)
{
int ichNext = chunk.Breaks.GetNextBreak(ichCurrent);
if (ichNext >= 0 && ichNext > ichCurrent && ichNext <= ichLim)
{
// -1 because ichNext is the character index where break occurs in front of it,
// while LSCP is the position where break occurs after it.
lscpHyphen = chunk.CharacterIndexToLSCP(ichNext - 1) + lscpChunk;
return true;
}
}
else
{
int ichPrev = chunk.Breaks.GetPreviousBreak(ichCurrent);
if (ichPrev >= 0 && ichPrev <= ichCurrent && ichPrev > ichLim)
{
// -1 because ichPrev is the character index where break occurs in front of it,
// while LSCP is the position where break occurs after it.
lscpHyphen = chunk.CharacterIndexToLSCP(ichPrev - 1) + lscpChunk;
return true;
}
}
}
}
return false;
}
internal LsErr Hyphenate(
IntPtr pols, // Line Layout context
int fLastHyphenFound, // whether last hyphen found?
int lscpLastHyphen, // cp of the last found hyphen
ref LsHyph lastHyph, // [in] last found hyphenation
int lscpWordStart, // first character of word
int lscpExceed, // first character in this word that exceeds column
ref int fHyphenFound, // [out] hyphenation opportunity found?
ref int lscpHyphen, // [out] cp of the character before hyphen
ref LsHyph lsHyph // [out] hyphen info
)
{
LsErr lserr = LsErr.None;
try
{
fHyphenFound = FullText.FindNextHyphenBreak(
lscpWordStart,
lscpExceed - lscpWordStart,
true, // isCurrentAtWordStart
ref lscpHyphen,
ref lsHyph
) ? 1 : 0;
Invariant.Assert(fHyphenFound == 0 || (lscpHyphen >= lscpWordStart && lscpHyphen < lscpExceed));
}
catch (Exception e)
{
SaveException(e, Plsrun.Undefined, null);
lserr = LsErr.ClientAbort;
}
catch
{
SaveNonCLSException("Hyphenate", Plsrun.Undefined, null);
lserr = LsErr.ClientAbort;
}
return lserr;
}