xref: /trunk/main/sal/textenc/unichars.c (revision 0cf2fd93dccc69f9c6d59dfb2dbcea73e82909ce)

/**************************************************************
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/

#include "unichars.h"
#include "osl/diagnose.h"
#include "sal/types.h"

int ImplIsNoncharacter(sal_uInt32 nUtf32)
{
    /* All code points that are noncharacters, as of Unicode 3.1.1. */
    return (nUtf32 >= 0xFDD0 && nUtf32 <= 0xFDEF)
           || (nUtf32 & 0xFFFF) >= 0xFFFE
           || nUtf32 > 0x10FFFF;
}

int ImplIsControlOrFormat(sal_uInt32 nUtf32)
{
    /* All code points of <http://www.unicode.org/Public/UNIDATA/
       UnicodeData.txt>, Version 3.1.1, that have a General Category of Cc
       (Other, Control) or Cf (Other, Format).
     */
    return nUtf32 <= 0x001F
           || (nUtf32 >= 0x007F && nUtf32 <= 0x009F)
           || nUtf32 == 0x070F /* SYRIAC ABBREVIATION MARK */
           || nUtf32 == 0x180B /* MONGOLIAN FREE VARIATION SELECTOR ONE */
           || nUtf32 == 0x180C /* MONGOLIAN FREE VARIATION SELECTOR TWO */
           || nUtf32 == 0x180D /* MONGOLIAN FREE VARIATION SELECTOR THREE */
           || nUtf32 == 0x180E /* MONGOLIAN VOWEL SEPARATOR */
           || nUtf32 == 0x200C /* ZERO WIDTH NON-JOINER */
           || nUtf32 == 0x200D /* ZERO WIDTH JOINER */
           || nUtf32 == 0x200E /* LEFT-TO-RIGHT MARK */
           || nUtf32 == 0x200F /* RIGHT-TO-LEFT MARK */
           || nUtf32 == 0x202A /* LEFT-TO-RIGHT EMBEDDING */
           || nUtf32 == 0x202B /* RIGHT-TO-LEFT EMBEDDING */
           || nUtf32 == 0x202C /* POP DIRECTIONAL FORMATTING */
           || nUtf32 == 0x202D /* LEFT-TO-RIGHT OVERRIDE */
           || nUtf32 == 0x202E /* RIGHT-TO-LEFT OVERRIDE */
           || nUtf32 == 0x206A /* INHIBIT SYMMETRIC SWAPPING */
           || nUtf32 == 0x206B /* ACTIVATE SYMMETRIC SWAPPING */
           || nUtf32 == 0x206C /* INHIBIT ARABIC FORM SHAPING */
           || nUtf32 == 0x206D /* ACTIVATE ARABIC FORM SHAPING */
           || nUtf32 == 0x206E /* NATIONAL DIGIT SHAPES */
           || nUtf32 == 0x206F /* NOMINAL DIGIT SHAPES */
           || nUtf32 == 0xFEFF /* ZERO WIDTH NO-BREAK SPACE */
           || nUtf32 == 0xFFF9 /* INTERLINEAR ANNOTATION ANCHOR */
           || nUtf32 == 0xFFFA /* INTERLINEAR ANNOTATION SEPARATOR */
           || nUtf32 == 0xFFFB /* INTERLINEAR ANNOTATION TERMINATOR */
           || nUtf32 == 0x1D173 /* MUSICAL SYMBOL BEGIN BEAM */
           || nUtf32 == 0x1D174 /* MUSICAL SYMBOL END BEAM */
           || nUtf32 == 0x1D175 /* MUSICAL SYMBOL BEGIN TIE */
           || nUtf32 == 0x1D176 /* MUSICAL SYMBOL END TIE */
           || nUtf32 == 0x1D177 /* MUSICAL SYMBOL BEGIN SLUR */
           || nUtf32 == 0x1D178 /* MUSICAL SYMBOL END SLUR */
           || nUtf32 == 0x1D179 /* MUSICAL SYMBOL BEGIN PHRASE */
           || nUtf32 == 0x1D17A /* MUSICAL SYMBOL END PHRASE */
           || nUtf32 == 0xE0001 /* LANGUAGE TAG */
           || (nUtf32 >= 0xE0020 && nUtf32 <= 0xE007F);
}

int ImplIsHighSurrogate(sal_uInt32 nUtf32)
{
    /* All code points that are high-surrogates, as of Unicode 3.1.1. */
    return nUtf32 >= 0xD800 && nUtf32 <= 0xDBFF;
}

int ImplIsLowSurrogate(sal_uInt32 nUtf32)
{
    /* All code points that are low-surrogates, as of Unicode 3.1.1. */
    return nUtf32 >= 0xDC00 && nUtf32 <= 0xDFFF;
}

int ImplIsPrivateUse(sal_uInt32 nUtf32)
{
    /* All code points of <http://www.unicode.org/Public/UNIDATA/
       UnicodeData.txt>, Version 3.1.1, that have a General Category of Co
       (Other, Private Use).
     */
    return (nUtf32 >= 0xE000 && nUtf32 <= 0xF8FF)
           || (nUtf32 >= 0xF0000 && nUtf32 <= 0xFFFFD)
           || (nUtf32 >= 0x100000 && nUtf32 <= 0x10FFFD);
}

int ImplIsZeroWidth(sal_uInt32 nUtf32)
{
    /* All code points of <http://www.unicode.org/Public/UNIDATA/
       UnicodeData.txt>, Version 3.1.1, that have "ZERO WIDTH" in their
       Character name.
     */
    return nUtf32 == 0x200B /* ZERO WIDTH SPACE */
           || nUtf32 == 0x200C /* ZERO WIDTH NON-JOINER */
           || nUtf32 == 0x200D /* ZERO WIDTH JOINER */
           || nUtf32 == 0xFEFF; /* ZERO WIDTH NO-BREAK SPACE */
}

sal_uInt32 ImplGetHighSurrogate(sal_uInt32 nUtf32)
{
    OSL_ENSURE(nUtf32 >= 0x10000, "specification violation");
    return ((nUtf32 - 0x10000) >> 10) | 0xD800;
}

sal_uInt32 ImplGetLowSurrogate(sal_uInt32 nUtf32)
{
    OSL_ENSURE(nUtf32 >= 0x10000, "specification violation");
    return ((nUtf32 - 0x10000) & 0x3FF) | 0xDC00;
}

sal_uInt32 ImplCombineSurrogates(sal_uInt32 nHigh, sal_uInt32 nLow)
{
    OSL_ENSURE(ImplIsHighSurrogate(nHigh) && ImplIsLowSurrogate(nLow),
               "specification violation");
    return (((nHigh & 0x3FF) << 10) | (nLow & 0x3FF)) + 0x10000;
}