/// <summary>
/// Transliterate the given text with the given UTransPosition
/// indices. Return TRUE if the transliteration should continue
/// or FALSE if it should halt (because of a U_PARTIAL_MATCH match).
/// Note that FALSE is only ever returned if isIncremental is TRUE.
/// </summary>
/// <param name="text">The text to be transliterated.</param>
/// <param name="pos">The position indices, which will be updated.</param>
/// <param name="incremental">If TRUE, assume new text may be inserted
/// at index.Limit, and return FALSE if thre is a partial match.</param>
/// <returns>TRUE unless a U_PARTIAL_MATCH has been obtained,
/// indicating that transliteration should stop until more text
/// arrives.</returns>
public virtual bool Transliterate(IReplaceable text,
TransliterationPosition pos,
bool incremental)
{
int indexByte = text.Char32At(pos.Start) & 0xFF;
for (int i = index[indexByte]; i < index[indexByte + 1]; ++i)
{
MatchDegree m = rules[i].MatchAndReplace(text, pos, incremental);
switch (m)
{
case MatchDegree.Match:
if (Transliterator.DEBUG)
{
Console.Out.WriteLine((incremental ? "Rule.i: match " : "Rule: match ") +
rules[i].ToRule(true) + " => " +
UtilityExtensions.FormatInput(text, pos));
}
return(true);
case MatchDegree.PartialMatch:
if (Transliterator.DEBUG)
{
Console.Out.WriteLine((incremental ? "Rule.i: partial match " : "Rule: partial match ") +
rules[i].ToRule(true) + " => " +
UtilityExtensions.FormatInput(text, pos));
}
return(false);
default:
if (Transliterator.DEBUG)
{
Console.Out.WriteLine("Rule: no match " + rules[i]);
}
break;
}
}
// No match or partial match from any rule
pos.Start += UTF16.GetCharCount(text.Char32At(pos.Start));
if (Transliterator.DEBUG)
{
Console.Out.WriteLine((incremental ? "Rule.i: no match => " : "Rule: no match => ") +
UtilityExtensions.FormatInput(text, pos));
}
return(true);
}
/// <summary>
/// Implement <see cref="IUnicodeMatcher"/> API.
/// </summary>
public virtual MatchDegree Matches(IReplaceable text,
int[] offset,
int limit,
bool incremental)
{
int start = offset[0];
int count = 0;
while (count < maxCount)
{
int pos = offset[0];
MatchDegree m = matcher.Matches(text, offset, limit, incremental);
if (m == MatchDegree.Match)
{
++count;
if (pos == offset[0])
{
// If offset has not moved we have a zero-width match.
// Don't keep matching it infinitely.
break;
}
}
else if (incremental && m == MatchDegree.PartialMatch)
{
return(MatchDegree.PartialMatch);
}
else
{
break;
}
}
if (incremental && offset[0] == limit)
{
return(MatchDegree.PartialMatch);
}
if (count >= minCount)
{
return(MatchDegree.Match);
}
offset[0] = start;
return(MatchDegree.Mismatch);
}
/// <summary>
/// Implement <see cref="IUnicodeMatcher"/>
/// </summary>
public virtual MatchDegree Matches(IReplaceable text,
int[] offset,
int limit,
bool incremental)
{
// Note (1): We process text in 16-bit code units, rather than
// 32-bit code points. This works because stand-ins are
// always in the BMP and because we are doing a literal match
// operation, which can be done 16-bits at a time.
int i;
int[] cursor = new int[] { offset[0] };
if (limit < cursor[0])
{
// Match in the reverse direction
for (i = pattern.Length - 1; i >= 0; --i)
{
char keyChar = pattern[i]; // OK; see note (1) above
IUnicodeMatcher subm = data.LookupMatcher(keyChar);
if (subm == null)
{
if (cursor[0] > limit &&
keyChar == text[cursor[0]])
{ // OK; see note (1) above
--cursor[0];
}
else
{
return(MatchDegree.Mismatch);
}
}
else
{
MatchDegree m =
subm.Matches(text, cursor, limit, incremental);
if (m != MatchDegree.Match)
{
return(m);
}
}
}
// Record the match position, but adjust for a normal
// forward start, limit, and only if a prior match does not
// exist -- we want the rightmost match.
if (matchStart < 0)
{
matchStart = cursor[0] + 1;
matchLimit = offset[0] + 1;
}
}
else
{
for (i = 0; i < pattern.Length; ++i)
{
if (incremental && cursor[0] == limit)
{
// We've reached the context limit without a mismatch and
// without completing our match.
return(MatchDegree.PartialMatch);
}
char keyChar = pattern[i]; // OK; see note (1) above
IUnicodeMatcher subm = data.LookupMatcher(keyChar);
if (subm == null)
{
// Don't need the cursor < limit check if
// incremental is true (because it's done above); do need
// it otherwise.
if (cursor[0] < limit &&
keyChar == text[cursor[0]])
{ // OK; see note (1) above
++cursor[0];
}
else
{
return(MatchDegree.Mismatch);
}
}
else
{
MatchDegree m =
subm.Matches(text, cursor, limit, incremental);
if (m != MatchDegree.Match)
{
return(m);
}
}
}
// Record the match position
matchStart = offset[0];
matchLimit = cursor[0];
}
offset[0] = cursor[0];
return(MatchDegree.Match);
}