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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2014 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version. Please see the file LICENSE-GPL for details.
*
* Web Page: http://mielke.cc/brltty/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#ifdef HAVE_ICU
#include <unicode/uchar.h>
#include <unicode/unorm.h>
#endif /* HAVE_ICU */
#ifdef HAVE_ICONV_H
#include <iconv.h>
#endif /* HAVE_ICONV_H */
#include "unicode.h"
#include "ascii.h"
int
getCharacterByName (wchar_t *character, const char *name) {
#ifdef HAVE_ICU
UErrorCode error = U_ZERO_ERROR;
UChar uc = u_charFromName(U_EXTENDED_CHAR_NAME, name, &error);
if (U_SUCCESS(error)) {
*character = uc;
return 1;
}
#endif /* HAVE_ICU */
return 0;
}
int
getCharacterWidth (wchar_t character) {
#if defined(HAVE_WCWIDTH)
return wcwidth(character);
#elif defined(HAVE_ICU)
UCharCategory category = u_getIntPropertyValue(character, UCHAR_GENERAL_CATEGORY);
UEastAsianWidth width = u_getIntPropertyValue(character, UCHAR_EAST_ASIAN_WIDTH);
if (character == 0) return 0;
if (category == U_CONTROL_CHAR) return -1;
if (category == U_NON_SPACING_MARK) return 0;
if (category == U_ENCLOSING_MARK) return 0;
/* Hangul Jamo medial vowels and final consonants */
if ((character >= 0X1160) && (character <= 0X11FF) && (category == U_OTHER_LETTER)) return 0;
/* */
if (character == 0XAD) return 1; /* soft hyphen */
if (category == U_FORMAT_CHAR) return 0;
if (width == U_EA_FULLWIDTH) return 2;
if (width == U_EA_HALFWIDTH) return 1;
if (width == U_EA_WIDE) return 2;
if (width == U_EA_NARROW) return 1;
if (width == U_EA_AMBIGUOUS) {
/* CJK Unified Ideographs block */
if ((character >= 0X4E00) && (character <= 0X9FFF)) return 2;
/* CJK Unified Ideographs Externsion A block */
if ((character >= 0X3400) && (character <= 0X4DBF)) return 2;
/* CJK Compatibility Ideographs block */
if ((character >= 0XF900) && (character <= 0XFAFF)) return 2;
/* Supplementary Ideographic Plane */
//if ((character >= 0X20000) && (character <= 0X2FFFF)) return 2;
/* Tertiary Ideographic Plane */
//if ((character >= 0X30000) && (character <= 0X3FFFF)) return 2;
}
if (category == U_UNASSIGNED) return -1;
return 1;
#else /* character width */
if (character == NUL) return 0;
if (character == DEL) return -1;
if (!(character & 0X60)) return -1;
return 1;
#endif /* character width */
}
wchar_t
getBaseCharacter (wchar_t character) {
#ifdef HAVE_ICU
UChar source[] = {character};
const unsigned int resultLength = 0X10;
UChar resultBuffer[resultLength];
UErrorCode error = U_ZERO_ERROR;
unorm_normalize(source, ARRAY_COUNT(source),
UNORM_NFD, 0,
resultBuffer, resultLength,
&error);
if (U_SUCCESS(error)) return resultBuffer[0];
#endif /* HAVE_ICU */
return 0;
}
wchar_t
getTransliteratedCharacter (wchar_t character) {
#ifdef HAVE_ICONV_H
static iconv_t handle = NULL;
if (!handle) handle = iconv_open("ASCII//TRANSLIT", "WCHAR_T");
if (handle != (iconv_t)-1) {
char *inputAddress = (char *)&character;
size_t inputSize = sizeof(character);
size_t outputSize = 0X10;
char outputBuffer[outputSize];
char *outputAddress = outputBuffer;
if (iconv(handle, &inputAddress, &inputSize, &outputAddress, &outputSize) != (size_t)-1)
if ((outputAddress - outputBuffer) == 1)
return outputBuffer[0] & 0XFF;
}
#endif /* HAVE_ICONV_H */
return 0;
}
int
handleBestCharacter (wchar_t character, CharacterHandler handleCharacter, void *data) {
typedef wchar_t CharacterTranslator (wchar_t character);
static CharacterTranslator *const characterTranslators[] = {
getBaseCharacter,
getTransliteratedCharacter,
NULL
};
CharacterTranslator *const *translateCharacter = characterTranslators;
while (!handleCharacter(character, data)) {
if (!*translateCharacter) return 0;
{
wchar_t alternate = (*translateCharacter++)(character);
if (alternate) character = alternate;
}
}
return 1;
}
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