/// <summary>
        /// Implements <see cref="M:IBM.ICU.Text.Transliterator.HandleTransliterate(IBM.ICU.Text.Replaceable, null, System.Boolean)"/>.
        /// </summary>
        ///
        protected internal override void HandleTransliterate(Replaceable text, Transliterator.Position offsets,
                                                             bool isIncremental)
        {
            if (csp == null)
            {
                return;
            }

            if (offsets.start >= offsets.limit)
            {
                return;
            }

            iter.SetText(text);
            result.Length = 0;
            int c, delta;

            // Walk through original string
            // If there is a case change, modify corresponding position in
            // replaceable

            iter.SetIndex(offsets.start);
            iter.SetLimit(offsets.limit);
            iter.SetContextLimits(offsets.contextStart, offsets.contextLimit);
            while ((c = iter.NextCaseMapCP()) >= 0)
            {
                c = csp.ToFullUpper(c, iter, result, locale, locCache);

                if (iter.DidReachLimit() && isIncremental)
                {
                    // the case mapping function tried to look beyond the context
                    // limit
                    // wait for more input
                    offsets.start = iter.GetCaseMapCPStart();
                    return;
                }

                /* decode the result */
                if (c < 0)
                {
                    /* c mapped to itself, no change */
                    continue;
                }
                else if (c <= IBM.ICU.Impl.UCaseProps.MAX_STRING_LENGTH)
                {
                    /* replace by the mapping string */
                    delta         = iter.Replace(result.ToString());
                    result.Length = 0;
                }
                else
                {
                    /* replace by single-code point mapping */
                    delta = iter.Replace(IBM.ICU.Text.UTF16.ValueOf(c));
                }

                if (delta != 0)
                {
                    offsets.limit        += delta;
                    offsets.contextLimit += delta;
                }
            }
            offsets.start = offsets.limit;
        }
Exemplo n.º 2
0
        /// <summary>
        /// Implements <see cref="M:IBM.ICU.Text.Transliterator.HandleTransliterate(IBM.ICU.Text.Replaceable, null, System.Boolean)"/>.
        /// </summary>
        ///
        protected internal override void HandleTransliterate(Replaceable text, Transliterator.Position offsets,
                                                             bool isIncremental)
        {
            // TODO reimplement, see ustrcase.c
            // using a real word break iterator
            // instead of just looking for a transition between cased and uncased
            // characters
            // call CaseMapTransliterator::handleTransliterate() for lowercasing?
            // (set fMap)
            // needs to take isIncremental into account because case mappings are
            // context-sensitive
            // also detect when lowercasing function did not finish because of
            // context

            if (offsets.start >= offsets.limit)
            {
                return;
            }

            // case type: >0 cased (UCaseProps.LOWER etc.) ==0 uncased <0
            // case-ignorable
            int type;

            // Our mode; we are either converting letter toTitle or
            // toLower.
            bool doTitle = true;

            // Determine if there is a preceding context of cased case-ignorable*,
            // in which case we want to start in toLower mode. If the
            // prior context is anything else (including empty) then start
            // in toTitle mode.
            int c, start;

            for (start = offsets.start - 1; start >= offsets.contextStart; start -= IBM.ICU.Text.UTF16
                                                                                    .GetCharCount(c))
            {
                c    = text.Char32At(start);
                type = csp.GetTypeOrIgnorable(c);
                if (type > 0)       // cased
                {
                    doTitle = false;
                    break;
                }
                else if (type == 0)         // uncased but not ignorable
                {
                    break;
                }
                // else (type<0) case-ignorable: continue
            }

            // Convert things after a cased character toLower; things
            // after a uncased, non-case-ignorable character toTitle. Case-ignorable
            // characters are copied directly and do not change the mode.

            iter.SetText(text);
            iter.SetIndex(offsets.start);
            iter.SetLimit(offsets.limit);
            iter.SetContextLimits(offsets.contextStart, offsets.contextLimit);

            result.Length = 0;

            // Walk through original string
            // If there is a case change, modify corresponding position in
            // replaceable
            int delta;

            while ((c = iter.NextCaseMapCP()) >= 0)
            {
                type = csp.GetTypeOrIgnorable(c);
                if (type >= 0)       // not case-ignorable
                {
                    if (doTitle)
                    {
                        c = csp.ToFullTitle(c, iter, result, locale, locCache);
                    }
                    else
                    {
                        c = csp.ToFullLower(c, iter, result, locale, locCache);
                    }
                    doTitle = type == 0;     // doTitle=isUncased

                    if (iter.DidReachLimit() && isIncremental)
                    {
                        // the case mapping function tried to look beyond the
                        // context limit
                        // wait for more input
                        offsets.start = iter.GetCaseMapCPStart();
                        return;
                    }

                    /* decode the result */
                    if (c < 0)
                    {
                        /* c mapped to itself, no change */
                        continue;
                    }
                    else if (c <= IBM.ICU.Impl.UCaseProps.MAX_STRING_LENGTH)
                    {
                        /* replace by the mapping string */
                        delta         = iter.Replace(result.ToString());
                        result.Length = 0;
                    }
                    else
                    {
                        /* replace by single-code point mapping */
                        delta = iter.Replace(IBM.ICU.Text.UTF16.ValueOf(c));
                    }

                    if (delta != 0)
                    {
                        offsets.limit        += delta;
                        offsets.contextLimit += delta;
                    }
                }
            }
            offsets.start = offsets.limit;
        }