364 lines
12 KiB
C++
364 lines
12 KiB
C++
/*
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* Copyright © 2009 Red Hat, Inc.
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* Copyright © 2009 Keith Stribley
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* 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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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb.hh"
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#ifdef HAVE_ICU
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#include "hb-icu.h"
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#include "hb-machinery.hh"
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#include <unicode/uchar.h>
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#include <unicode/unorm2.h>
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#include <unicode/ustring.h>
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#include <unicode/utf16.h>
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#include <unicode/uversion.h>
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/* ICU extra semicolon, fixed since 65, https://github.com/unicode-org/icu/commit/480bec3 */
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#if U_ICU_VERSION_MAJOR_NUM < 65 && (defined(__GNUC__) || defined(__clang__))
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#define HB_ICU_EXTRA_SEMI_IGNORED
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wextra-semi-stmt"
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#endif
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/**
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* SECTION:hb-icu
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* @title: hb-icu
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* @short_description: ICU integration
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* @include: hb-icu.h
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*
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* Functions for using HarfBuzz with the ICU library to provide Unicode data.
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**/
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hb_script_t
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hb_icu_script_to_script (UScriptCode script)
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{
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if (unlikely (script == USCRIPT_INVALID_CODE))
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return HB_SCRIPT_INVALID;
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return hb_script_from_string (uscript_getShortName (script), -1);
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}
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UScriptCode
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hb_icu_script_from_script (hb_script_t script)
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{
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if (unlikely (script == HB_SCRIPT_INVALID))
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return USCRIPT_INVALID_CODE;
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unsigned int numScriptCode = 1 + u_getIntPropertyMaxValue (UCHAR_SCRIPT);
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for (unsigned int i = 0; i < numScriptCode; i++)
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if (unlikely (hb_icu_script_to_script ((UScriptCode) i) == script))
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return (UScriptCode) i;
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return USCRIPT_UNKNOWN;
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}
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static hb_unicode_combining_class_t
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hb_icu_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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return (hb_unicode_combining_class_t) u_getCombiningClass (unicode);
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}
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static hb_unicode_general_category_t
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hb_icu_unicode_general_category (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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switch (u_getIntPropertyValue(unicode, UCHAR_GENERAL_CATEGORY))
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{
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case U_UNASSIGNED: return HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED;
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case U_UPPERCASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_UPPERCASE_LETTER;
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case U_LOWERCASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER;
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case U_TITLECASE_LETTER: return HB_UNICODE_GENERAL_CATEGORY_TITLECASE_LETTER;
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case U_MODIFIER_LETTER: return HB_UNICODE_GENERAL_CATEGORY_MODIFIER_LETTER;
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case U_OTHER_LETTER: return HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER;
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case U_NON_SPACING_MARK: return HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK;
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case U_ENCLOSING_MARK: return HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK;
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case U_COMBINING_SPACING_MARK: return HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK;
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case U_DECIMAL_DIGIT_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_DECIMAL_NUMBER;
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case U_LETTER_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_LETTER_NUMBER;
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case U_OTHER_NUMBER: return HB_UNICODE_GENERAL_CATEGORY_OTHER_NUMBER;
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case U_SPACE_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_SPACE_SEPARATOR;
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case U_LINE_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_LINE_SEPARATOR;
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case U_PARAGRAPH_SEPARATOR: return HB_UNICODE_GENERAL_CATEGORY_PARAGRAPH_SEPARATOR;
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case U_CONTROL_CHAR: return HB_UNICODE_GENERAL_CATEGORY_CONTROL;
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case U_FORMAT_CHAR: return HB_UNICODE_GENERAL_CATEGORY_FORMAT;
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case U_PRIVATE_USE_CHAR: return HB_UNICODE_GENERAL_CATEGORY_PRIVATE_USE;
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case U_SURROGATE: return HB_UNICODE_GENERAL_CATEGORY_SURROGATE;
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case U_DASH_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_DASH_PUNCTUATION;
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case U_START_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_OPEN_PUNCTUATION;
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case U_END_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION;
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case U_CONNECTOR_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_CONNECT_PUNCTUATION;
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case U_OTHER_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_OTHER_PUNCTUATION;
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case U_MATH_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_MATH_SYMBOL;
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case U_CURRENCY_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_CURRENCY_SYMBOL;
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case U_MODIFIER_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL;
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case U_OTHER_SYMBOL: return HB_UNICODE_GENERAL_CATEGORY_OTHER_SYMBOL;
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case U_INITIAL_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_INITIAL_PUNCTUATION;
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case U_FINAL_PUNCTUATION: return HB_UNICODE_GENERAL_CATEGORY_FINAL_PUNCTUATION;
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}
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return HB_UNICODE_GENERAL_CATEGORY_UNASSIGNED;
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}
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static hb_codepoint_t
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hb_icu_unicode_mirroring (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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return u_charMirror(unicode);
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}
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static hb_script_t
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hb_icu_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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UErrorCode status = U_ZERO_ERROR;
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UScriptCode scriptCode = uscript_getScript(unicode, &status);
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if (unlikely (U_FAILURE (status)))
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return HB_SCRIPT_UNKNOWN;
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return hb_icu_script_to_script (scriptCode);
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}
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static hb_bool_t
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hb_icu_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t a,
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hb_codepoint_t b,
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hb_codepoint_t *ab,
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void *user_data HB_UNUSED)
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{
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#if U_ICU_VERSION_MAJOR_NUM >= 49
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{
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const UNormalizer2 *normalizer = (const UNormalizer2 *) user_data;
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UChar32 ret = unorm2_composePair (normalizer, a, b);
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if (ret < 0) return false;
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*ab = ret;
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return true;
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}
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#endif
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/* We don't ifdef-out the fallback code such that compiler always
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* sees it and makes sure it's compilable. */
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UChar utf16[4], normalized[5];
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unsigned int len;
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hb_bool_t ret, err;
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UErrorCode icu_err;
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len = 0;
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err = false;
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U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), a, err);
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if (err) return false;
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U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), b, err);
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if (err) return false;
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icu_err = U_ZERO_ERROR;
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len = unorm2_normalize (unorm2_getNFCInstance (&icu_err), utf16, len, normalized, ARRAY_LENGTH (normalized), &icu_err);
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if (U_FAILURE (icu_err))
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return false;
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if (u_countChar32 (normalized, len) == 1) {
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U16_GET_UNSAFE (normalized, 0, *ab);
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ret = true;
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} else {
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ret = false;
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}
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return ret;
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}
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static hb_bool_t
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hb_icu_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t ab,
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hb_codepoint_t *a,
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hb_codepoint_t *b,
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void *user_data HB_UNUSED)
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{
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#if U_ICU_VERSION_MAJOR_NUM >= 49
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{
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const UNormalizer2 *normalizer = (const UNormalizer2 *) user_data;
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UChar decomposed[4];
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int len;
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UErrorCode icu_err = U_ZERO_ERROR;
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len = unorm2_getRawDecomposition (normalizer, ab, decomposed,
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ARRAY_LENGTH (decomposed), &icu_err);
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if (U_FAILURE (icu_err) || len < 0) return false;
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len = u_countChar32 (decomposed, len);
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if (len == 1) {
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U16_GET_UNSAFE (decomposed, 0, *a);
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*b = 0;
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return *a != ab;
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} else if (len == 2) {
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len = 0;
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U16_NEXT_UNSAFE (decomposed, len, *a);
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U16_NEXT_UNSAFE (decomposed, len, *b);
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}
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return true;
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}
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#endif
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/* We don't ifdef-out the fallback code such that compiler always
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* sees it and makes sure it's compilable. */
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UChar utf16[2], normalized[2 * 19/*HB_UNICODE_MAX_DECOMPOSITION_LEN*/ + 1];
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unsigned int len;
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hb_bool_t ret, err;
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UErrorCode icu_err;
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/* This function is a monster! Maybe it wasn't a good idea adding a
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* pairwise decompose API... */
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/* Watchout for the dragons. Err, watchout for macros changing len. */
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len = 0;
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err = false;
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U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), ab, err);
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if (err) return false;
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icu_err = U_ZERO_ERROR;
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len = unorm2_normalize (unorm2_getNFDInstance (&icu_err), utf16, len, normalized, ARRAY_LENGTH (normalized), &icu_err);
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if (U_FAILURE (icu_err))
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return false;
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len = u_countChar32 (normalized, len);
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if (len == 1) {
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U16_GET_UNSAFE (normalized, 0, *a);
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*b = 0;
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ret = *a != ab;
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} else if (len == 2) {
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len = 0;
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U16_NEXT_UNSAFE (normalized, len, *a);
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U16_NEXT_UNSAFE (normalized, len, *b);
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/* Here's the ugly part: if ab decomposes to a single character and
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* that character decomposes again, we have to detect that and undo
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* the second part :-(. */
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UChar recomposed[20];
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icu_err = U_ZERO_ERROR;
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unorm2_normalize (unorm2_getNFCInstance (&icu_err), normalized, len, recomposed, ARRAY_LENGTH (recomposed), &icu_err);
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if (U_FAILURE (icu_err))
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return false;
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hb_codepoint_t c;
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U16_GET_UNSAFE (recomposed, 0, c);
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if (c != *a && c != ab) {
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*a = c;
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*b = 0;
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}
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ret = true;
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} else {
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/* If decomposed to more than two characters, take the last one,
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* and recompose the rest to get the first component. */
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U16_PREV_UNSAFE (normalized, len, *b); /* Changes len in-place. */
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UChar recomposed[18 * 2];
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icu_err = U_ZERO_ERROR;
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len = unorm2_normalize (unorm2_getNFCInstance (&icu_err), normalized, len, recomposed, ARRAY_LENGTH (recomposed), &icu_err);
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if (U_FAILURE (icu_err))
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return false;
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/* We expect that recomposed has exactly one character now. */
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if (unlikely (u_countChar32 (recomposed, len) != 1))
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return false;
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U16_GET_UNSAFE (recomposed, 0, *a);
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ret = true;
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}
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return ret;
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}
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#if HB_USE_ATEXIT
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static void free_static_icu_funcs ();
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#endif
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static struct hb_icu_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader_t<hb_icu_unicode_funcs_lazy_loader_t>
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{
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static hb_unicode_funcs_t *create ()
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{
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void *user_data = nullptr;
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#if U_ICU_VERSION_MAJOR_NUM >= 49
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UErrorCode icu_err = U_ZERO_ERROR;
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user_data = (void *) unorm2_getNFCInstance (&icu_err);
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assert (user_data);
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#endif
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hb_unicode_funcs_t *funcs = hb_unicode_funcs_create (nullptr);
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hb_unicode_funcs_set_combining_class_func (funcs, hb_icu_unicode_combining_class, nullptr, nullptr);
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hb_unicode_funcs_set_general_category_func (funcs, hb_icu_unicode_general_category, nullptr, nullptr);
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hb_unicode_funcs_set_mirroring_func (funcs, hb_icu_unicode_mirroring, nullptr, nullptr);
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hb_unicode_funcs_set_script_func (funcs, hb_icu_unicode_script, nullptr, nullptr);
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hb_unicode_funcs_set_compose_func (funcs, hb_icu_unicode_compose, user_data, nullptr);
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hb_unicode_funcs_set_decompose_func (funcs, hb_icu_unicode_decompose, user_data, nullptr);
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hb_unicode_funcs_make_immutable (funcs);
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#if HB_USE_ATEXIT
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atexit (free_static_icu_funcs);
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#endif
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return funcs;
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}
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} static_icu_funcs;
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#if HB_USE_ATEXIT
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static
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void free_static_icu_funcs ()
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{
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static_icu_funcs.free_instance ();
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}
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#endif
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hb_unicode_funcs_t *
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hb_icu_get_unicode_funcs ()
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{
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return static_icu_funcs.get_unconst ();
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}
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#ifdef HB_ICU_EXTRA_SEMI_IGNORED
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#pragma GCC diagnostic pop
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#endif
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#endif
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