1 files changed, 223 insertions, 0 deletions
diff --git a/i18nutil/source/utility/casefolding.cxx b/i18nutil/source/utility/casefolding.cxx
new file mode 100644
index 0000000000..52dbeb1ca1
--- /dev/null
+++ b/i18nutil/source/utility/casefolding.cxx
@@ -0,0 +1,223 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <i18nutil/casefolding.hxx>
+#include "casefolding_data.h"
+#include <i18nutil/oneToOneMapping.hxx>
+#include <i18nutil/widthfolding.hxx>
+#include <i18nutil/transliteration.hxx>
+#include <com/sun/star/lang/Locale.hpp>
+#include <com/sun/star/uno/RuntimeException.hpp>
+#include <rtl/character.hxx>
+
+#include <unicode/uchar.h>
+
+using namespace com::sun::star::lang;
+using namespace com::sun::star::uno;
+
+namespace i18nutil {
+
+const Mapping mapping_03a3[] = {{0, 1, {0x03c2, 0, 0}},{0, 1, {0x03c3, 0, 0}}};
+const Mapping mapping_0307[] = {{0, 0, {0, 0, 0}},{0, 1, {0x0307, 0, 0}}};
+const Mapping mapping_004a[] = {{0, 2, {0x006a, 0x0307, 0}},{0, 1, {0x006a, 0, 0}}};
+const Mapping mapping_012e[] = {{0, 2, {0x012f, 0x0307, 0}},{0, 1, {0x012f, 0, 0}}};
+const Mapping mapping_00cc[] = {{0, 3, {0x0069, 0x0307, 0x0300}},{0, 1, {0x00ec, 0, 0}}};
+const Mapping mapping_00cd[] = {{0, 3, {0x0069, 0x0307, 0x0301}},{0, 1, {0x00ed, 0, 0}}};
+const Mapping mapping_0128[] = {{0, 3, {0x0069, 0x0307, 0x0303}},{0, 1, {0x0129, 0, 0}}};
+const Mapping mapping_0049[] = {{0, 2, {0x0069, 0x0307, 0}},{0, 1, {0x0131, 0, 0}},{0, 1, {0x0069, 0, 0}}};
+const Mapping mapping_0069[] = {{0, 1, {0x0130, 0, 0}},{0, 1, {0x0049, 0, 0}}};
+const Mapping mapping_0130[] = {{0, 1, {0x0069, 0, 0}},{0, 1, {0x0130, 0, 0}}};
+
+#define langIs(lang) (aLocale.Language == lang)
+
+// only check simple case, there is more complicated case need to be checked.
+#define type_i(ch) ((ch) == 0x0069 || (ch) == 0x006a)
+
+static bool cased_letter(sal_Unicode ch)
+{
+    int msb = ch >> 8;
+    int cmi = CaseMappingIndex[msb];
+    if (cmi < 0)
+        return false;
+    int cmv_idx = (cmi << 8) + (ch & 0xff);
+    return bool(static_cast<MappingType>(CaseMappingValue[cmv_idx].type) & MappingType::CasedLetterMask);
+}
+
+// for Lithuanian, condition to make explicit dot above when lowercasing capital I's and J's
+// whenever there are more accents above.
+#define accent_above(ch) (((ch) >= 0x0300 && (ch) <= 0x0314) || ((ch) >= 0x033D && (ch) <= 0x0344) || (ch) == 0x0346 || ((ch) >= 0x034A && (ch) <= 0x034C))
+
+const Mapping& casefolding::getConditionalValue(const sal_Unicode* str, sal_Int32 pos, sal_Int32 len, Locale const & aLocale, MappingType nMappingType)
+{
+        switch(str[pos]) {
+        case 0x03a3:
+            // final_sigma (not followed by cased and preceded by cased character)
+            // DOES NOT check ignorable sequence yet (more complicated implementation).
+            return !(pos < len && cased_letter(str[pos+1])) && (pos > 0 && cased_letter(str[pos-1])) ?
+                mapping_03a3[0] : mapping_03a3[1];
+        case 0x0307:
+            return (((nMappingType == MappingType::LowerToUpper && langIs("lt")) ||
+                (nMappingType == MappingType::UpperToLower && (langIs("tr") || langIs("az")))) &&
+                (pos > 0 && type_i(str[pos-1]))) ?      // after_i
+                    mapping_0307[0] : mapping_0307[1];
+        case 0x0130:
+            return (langIs("tr") || langIs("az")) ? mapping_0130[0] : mapping_0130[1];
+        case 0x0069:
+            return (langIs("tr") || langIs("az")) ? mapping_0069[0] : mapping_0069[1];
+        case 0x0049: return langIs("lt") && pos > len && accent_above(str[pos+1]) ? mapping_0049[0] :
+                    (langIs("tr") || langIs("az")) ? mapping_0049[1] : mapping_0049[2];
+        case 0x004a: return langIs("lt") && pos > len && accent_above(str[pos+1]) ? mapping_004a[0] : mapping_004a[1];
+        case 0x012e: return langIs("lt") && pos > len && accent_above(str[pos+1]) ? mapping_012e[0] : mapping_012e[1];
+        case 0x00cc: return langIs("lt") ? mapping_00cc[0] : mapping_00cc[1];
+        case 0x00cd: return langIs("lt") ? mapping_00cd[0] : mapping_00cd[1];
+        case 0x0128: return langIs("lt") ? mapping_0128[0] : mapping_0128[1];
+        }
+        // Should not come here
+        throw RuntimeException();
+}
+
+Mapping casefolding::getValue(const sal_Unicode* str, sal_Int32 pos, sal_Int32 len, Locale const & aLocale, MappingType nMappingType)
+{
+    if (pos > 0 && rtl::isHighSurrogate(str[pos-1]) && rtl::isLowSurrogate(str[pos]))
+        return { 0, 0, { 0, 0, 0 } };
+
+    Mapping dummy = { 0, 1, { str[pos], 0, 0 } };
+
+    sal_uInt32 c;
+    if (pos + 1 < len && rtl::isHighSurrogate(str[pos]) && rtl::isLowSurrogate(str[pos + 1]))
+        c = rtl::combineSurrogates(str[pos], str[pos + 1]);
+    else
+        c = str[pos];
+
+    sal_Int16 address = -1;
+    if (c < SAL_N_ELEMENTS(CaseMappingIndex) * 256)
+        address = CaseMappingIndex[c >> 8];
+
+    if (address >= 0) {
+        address = (address << 8) + (c & 0xFF);
+        if (static_cast<MappingType>(CaseMappingValue[address].type) & nMappingType) {
+            MappingType type = static_cast<MappingType>(CaseMappingValue[address].type);
+            if (type & MappingType::NotValue) {
+                if (CaseMappingValue[address].value == 0)
+                    return getConditionalValue(str, pos, len, aLocale, nMappingType);
+                else {
+                    for (int map = CaseMappingValue[address].value;
+                            map < CaseMappingValue[address].value + MaxCaseMappingExtras; map++) {
+                        if (static_cast<MappingType>(CaseMappingExtra[map].type) & nMappingType) {
+                            if (static_cast<MappingType>(CaseMappingExtra[map].type) & MappingType::NotValue)
+                                return getConditionalValue(str, pos, len, aLocale, nMappingType);
+                            else
+                                return CaseMappingExtra[map];
+                        }
+                    }
+                    // Should not come here
+                    throw RuntimeException();
+                }
+            }
+            else
+            {
+                dummy.map[0] = CaseMappingValue[address].value;
+                return dummy;
+            }
+        }
+    }
+
+    // If the code point is not supported by our case mapping tables,
+    // fallback to ICU functions.
+    // TODO: this does not handle special case mapping as these require
+    // using ustring.h APIs, which work on the whole string not character
+    // by character.
+    // TODO: what is the difference between ToLower and UpperToLower etc.?
+    sal_uInt32 value = c;
+    switch (nMappingType)
+    {
+        case MappingType::ToLower:
+        case MappingType::UpperToLower:
+            value = u_tolower(c);
+            break;
+        case MappingType::ToUpper:
+        case MappingType::LowerToUpper:
+            value = u_toupper(c);
+            break;
+        case MappingType::ToTitle:
+            value = u_totitle(c);
+            break;
+        case MappingType::SimpleFolding:
+        case MappingType::FullFolding:
+            value = u_foldCase(c, U_FOLD_CASE_DEFAULT);
+            break;
+        default: break;
+    }
+
+    dummy.nmap = rtl::splitSurrogates(value, dummy.map);
+
+    return dummy;
+}
+
+static bool
+is_ja_voice_sound_mark(sal_Unicode& current, sal_Unicode next)
+{
+        if (next != 0x3099 && next != 0x309a)
+            return false;
+        sal_Unicode c = widthfolding::getCompositionChar(current, next);
+        if (c != 0)
+            current = c;
+        return c != 0;
+}
+
+sal_Unicode casefolding::getNextChar(const sal_Unicode *str, sal_Int32& idx, sal_Int32 len, MappingElement& e, Locale const & aLocale, MappingType nMappingType, TransliterationFlags moduleLoaded)
+{
+        if( idx >= len )
+        {
+            e = MappingElement();
+            return 0;
+        }
+
+        sal_Unicode c;
+
+        if (moduleLoaded & TransliterationFlags::IGNORE_CASE) {
+            if( e.current >= e.element.nmap ) {
+                e.element = getValue(str, idx++, len, aLocale, nMappingType);
+                e.current = 0;
+            }
+            c = e.element.map[e.current++];
+        } else {
+            c = *(str + idx++);
+        }
+
+        if (moduleLoaded & TransliterationFlags::IGNORE_KANA) {
+            if ((0x3040 <= c && c <= 0x3094) || (0x309d <= c && c <= 0x309f))
+                c += 0x60;
+        }
+
+        // composition: KA + voice-mark --> GA. see halfwidthToFullwidth.cxx for detail
+        if (moduleLoaded & TransliterationFlags::IGNORE_WIDTH) {
+            static oneToOneMapping& half2fullTable = widthfolding::gethalf2fullTable();
+            c = half2fullTable[c];
+            if (0x3040 <= c && c <= 0x30ff && idx < len &&
+                    is_ja_voice_sound_mark(c, half2fullTable[*(str + idx)]))
+                idx++;
+        }
+
+        return c;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */