harfbuzz/src/hb-icu.cc

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/*
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* Copyright © 2009 Red Hat, Inc.
* Copyright © 2009 Keith Stribley
* Copyright © 2011 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
#include "hb-private.hh"
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#include "hb-icu.h"
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#include "hb-unicode-private.hh"
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#include <unicode/uversion.h>
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#include <unicode/uchar.h>
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#include <unicode/unorm.h>
#include <unicode/unistr.h>
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hb_script_t
hb_icu_script_to_script (UScriptCode script)
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{
if (unlikely (script == USCRIPT_INVALID_CODE))
return HB_SCRIPT_INVALID;
return hb_script_from_string (uscript_getShortName (script), -1);
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}
UScriptCode
hb_icu_script_from_script (hb_script_t script)
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{
if (unlikely (script == HB_SCRIPT_INVALID))
return USCRIPT_INVALID_CODE;
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for (unsigned int i = 0; i < USCRIPT_CODE_LIMIT; i++)
if (unlikely (hb_icu_script_to_script ((UScriptCode) i) == script))
return (UScriptCode) i;
return USCRIPT_UNKNOWN;
}
static unsigned int
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hb_icu_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode,
void *user_data HB_UNUSED)
{
return u_getCombiningClass (unicode);
}
static unsigned int
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hb_icu_unicode_eastasian_width (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode,
void *user_data HB_UNUSED)
{
switch (u_getIntPropertyValue(unicode, UCHAR_EAST_ASIAN_WIDTH))
{
case U_EA_WIDE:
case U_EA_FULLWIDTH:
return 2;
case U_EA_NEUTRAL:
case U_EA_AMBIGUOUS:
case U_EA_HALFWIDTH:
case U_EA_NARROW:
return 1;
}
return 1;
}
static hb_unicode_general_category_t
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hb_icu_unicode_general_category (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode,
void *user_data HB_UNUSED)
{
switch (u_getIntPropertyValue(unicode, UCHAR_GENERAL_CATEGORY))
{
case U_UNASSIGNED: return HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED;
case U_UPPERCASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_UPPERCASE_LETTER;
case U_LOWERCASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER;
case U_TITLECASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_TITLECASE_LETTER;
case U_MODIFIER_LETTER: return HB_UNICODE_GENERAL_CATEGORY_MODIFIER_LETTER;
case U_OTHER_LETTER: return HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER;
case U_NON_SPACING_MARK: return HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK;
case U_ENCLOSING_MARK: return HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK;
case U_COMBINING_SPACING_MARK: return HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK;
case U_DECIMAL_DIGIT_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER;
case U_LETTER_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_LETTER_NUMBER;
case U_OTHER_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_OTHER_NUMBER;
case U_SPACE_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_SPACE_SEPARATOR;
case U_LINE_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_LINE_SEPARATOR;
case U_PARAGRAPH_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_PARAGRAPH_SEPARATOR;
case U_CONTROL_CHAR: return HB_UNICODE_GENERAL_CATEGORY_CONTROL;
case U_FORMAT_CHAR: return HB_UNICODE_GENERAL_CATEGORY_FORMAT;
case U_PRIVATE_USE_CHAR: return HB_UNICODE_GENERAL_CATEGORY_PRIVATE_USE;
case U_SURROGATE: return HB_UNICODE_GENERAL_CATEGORY_SURROGATE;
case U_DASH_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_DASH_PUNCTUATION;
case U_START_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_OPEN_PUNCTUATION;
case U_END_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION;
case U_CONNECTOR_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_CONNECT_PUNCTUATION;
case U_OTHER_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_OTHER_PUNCTUATION;
case U_MATH_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_MATH_SYMBOL;
case U_CURRENCY_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_CURRENCY_SYMBOL;
case U_MODIFIER_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL;
case U_OTHER_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_OTHER_SYMBOL;
case U_INITIAL_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_INITIAL_PUNCTUATION;
case U_FINAL_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_FINAL_PUNCTUATION;
}
return HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED;
}
static hb_codepoint_t
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hb_icu_unicode_mirroring (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode,
void *user_data HB_UNUSED)
{
return u_charMirror(unicode);
}
static hb_script_t
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hb_icu_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t unicode,
void *user_data HB_UNUSED)
{
UErrorCode status = U_ZERO_ERROR;
UScriptCode scriptCode = uscript_getScript(unicode, &status);
if (unlikely (status != U_ZERO_ERROR))
return HB_SCRIPT_UNKNOWN;
return hb_icu_script_to_script (scriptCode);
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}
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static hb_bool_t
hb_icu_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t a,
hb_codepoint_t b,
hb_codepoint_t *ab,
void *user_data HB_UNUSED)
{
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if (!a || !b)
return FALSE;
UChar utf16[4], normalized[5];
gint len;
hb_bool_t ret, err;
UErrorCode icu_err;
len = 0;
err = FALSE;
U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), a, err);
if (err) return FALSE;
U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), b, err);
if (err) return FALSE;
icu_err = U_ZERO_ERROR;
len = unorm_normalize (utf16, len, UNORM_NFC, 0, normalized, ARRAY_LENGTH (normalized), &icu_err);
if (icu_err)
return FALSE;
normalized[len] = 0;
if (u_strlen (normalized) == 1) {
U16_GET_UNSAFE (normalized, 0, *ab);
ret = TRUE;
} else {
ret = FALSE;
}
return ret;
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}
static hb_bool_t
hb_icu_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
hb_codepoint_t ab,
hb_codepoint_t *a,
hb_codepoint_t *b,
void *user_data HB_UNUSED)
{
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UChar utf16[2], normalized[20];
gint len;
hb_bool_t ret, err;
UErrorCode icu_err;
/* This function is a monster! Maybe it wasn't a good idea adding a
* pairwise decompose API... */
/* Watchout for the dragons. Err, watchout for macros changing len. */
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len = 0;
err = FALSE;
U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), ab, err);
if (err) return FALSE;
icu_err = U_ZERO_ERROR;
len = unorm_normalize (utf16, len, UNORM_NFD, 0, normalized, ARRAY_LENGTH (normalized), &icu_err);
if (icu_err)
return FALSE;
normalized[len] = 0;
len = u_strlen (normalized);
if (len == 1) {
U16_GET_UNSAFE (normalized, 0, *a);
*b = 0;
ret = *a != ab;
} else if (len == 2) {
len =0;
U16_NEXT_UNSAFE (normalized, len, *a);
U16_NEXT_UNSAFE (normalized, len, *b);
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/* Here's the ugly part: if ab decomposes to a single character and
* that character decomposes again, we have to detect that and undo
* the second part :-(. */
UChar recomposed[20];
icu_err = U_ZERO_ERROR;
unorm_normalize (normalized, len, UNORM_NFC, 0, recomposed, ARRAY_LENGTH (recomposed), &icu_err);
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if (icu_err)
return FALSE;
hb_codepoint_t c;
U16_GET_UNSAFE (recomposed, 0, c);
if (c != *a && c != ab) {
*a = c;
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*b = 0;
}
ret = TRUE;
} else {
/* If decomposed to more than two characters, take the last one,
* and recompose the rest to get the first component. */
U16_PREV_UNSAFE (normalized, len, *b);
UChar recomposed[20];
icu_err = U_ZERO_ERROR;
len = unorm_normalize (normalized, len, UNORM_NFC, 0, recomposed, ARRAY_LENGTH (recomposed), &icu_err);
if (icu_err)
return FALSE;
/* We expect that recomposed has exactly one character now. */
U16_GET_UNSAFE (recomposed, 0, *a);
ret = TRUE;
}
return ret;
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}
extern HB_INTERNAL hb_unicode_funcs_t _hb_unicode_funcs_icu;
hb_unicode_funcs_t _hb_icu_unicode_funcs = {
HB_OBJECT_HEADER_STATIC,
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NULL, /* parent */
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TRUE, /* immutable */
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{
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#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_icu_unicode_##name,
HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_UNICODE_FUNC_IMPLEMENT
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}
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};
hb_unicode_funcs_t *
hb_icu_get_unicode_funcs (void)
{
return &_hb_icu_unicode_funcs;
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}
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