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+/*
+ * Copyright © 2009 Red Hat, Inc.
+ * Copyright © 2009 Keith Stribley
+ * Copyright © 2011 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * 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
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-private.hh"
+
+#include "hb-icu.h"
+
+#include "hb-unicode-private.hh"
+
+#include <unicode/uchar.h>
+#include <unicode/unorm.h>
+#include <unicode/ustring.h>
+#include <unicode/utf16.h>
+#include <unicode/uversion.h>
+
+
+hb_script_t
+hb_icu_script_to_script (UScriptCode script)
+{
+ if (unlikely (script == USCRIPT_INVALID_CODE))
+ return HB_SCRIPT_INVALID;
+
+ return hb_script_from_string (uscript_getShortName (script), -1);
+}
+
+UScriptCode
+hb_icu_script_from_script (hb_script_t script)
+{
+ if (unlikely (script == HB_SCRIPT_INVALID))
+ return USCRIPT_INVALID_CODE;
+
+ 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 hb_unicode_combining_class_t
+hb_icu_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
+ hb_codepoint_t unicode,
+ void *user_data HB_UNUSED)
+
+{
+ return (hb_unicode_combining_class_t) u_getCombiningClass (unicode);
+}
+
+static unsigned int
+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
+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
+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
+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 (U_FAILURE (status)))
+ return HB_SCRIPT_UNKNOWN;
+
+ return hb_icu_script_to_script (scriptCode);
+}
+
+#if U_ICU_VERSION_MAJOR_NUM >= 49
+static const UNormalizer2 *normalizer;
+#endif
+
+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)
+{
+#if U_ICU_VERSION_MAJOR_NUM >= 49
+ {
+ UChar32 ret = unorm2_composePair (normalizer, a, b);
+ if (ret < 0) return false;
+ *ab = ret;
+ return true;
+ }
+#endif
+
+ /* We don't ifdef-out the fallback code such that compiler always
+ * sees it and makes sure it's compilable. */
+
+ UChar utf16[4], normalized[5];
+ unsigned int 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 (U_FAILURE (icu_err))
+ return false;
+ if (u_countChar32 (normalized, len) == 1) {
+ U16_GET_UNSAFE (normalized, 0, *ab);
+ ret = true;
+ } else {
+ ret = false;
+ }
+
+ return ret;
+}
+
+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)
+{
+#if U_ICU_VERSION_MAJOR_NUM >= 49
+ {
+ UChar decomposed[4];
+ int len;
+ UErrorCode icu_err = U_ZERO_ERROR;
+ len = unorm2_getRawDecomposition (normalizer, ab, decomposed,
+ ARRAY_LENGTH (decomposed), &icu_err);
+ if (U_FAILURE (icu_err) || len < 0) return false;
+
+ len = u_countChar32 (decomposed, len);
+ if (len == 1) {
+ U16_GET_UNSAFE (decomposed, 0, *a);
+ *b = 0;
+ return *a != ab;
+ } else if (len == 2) {
+ len =0;
+ U16_NEXT_UNSAFE (decomposed, len, *a);
+ U16_NEXT_UNSAFE (decomposed, len, *b);
+ }
+ return true;
+ }
+#endif
+
+ /* We don't ifdef-out the fallback code such that compiler always
+ * sees it and makes sure it's compilable. */
+
+ UChar utf16[2], normalized[2 * HB_UNICODE_MAX_DECOMPOSITION_LEN + 1];
+ unsigned int 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. */
+
+ 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 (U_FAILURE (icu_err))
+ return false;
+
+ len = u_countChar32 (normalized, len);
+
+ 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);
+
+ /* 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);
+ if (U_FAILURE (icu_err))
+ return false;
+ hb_codepoint_t c;
+ U16_GET_UNSAFE (recomposed, 0, c);
+ if (c != *a && c != ab) {
+ *a = c;
+ *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); /* Changes len in-place. */
+ UChar recomposed[18 * 2];
+ icu_err = U_ZERO_ERROR;
+ len = unorm_normalize (normalized, len, UNORM_NFC, 0, recomposed, ARRAY_LENGTH (recomposed), &icu_err);
+ if (U_FAILURE (icu_err))
+ return false;
+ /* We expect that recomposed has exactly one character now. */
+ if (unlikely (u_countChar32 (recomposed, len) != 1))
+ return false;
+ U16_GET_UNSAFE (recomposed, 0, *a);
+ ret = true;
+ }
+
+ return ret;
+}
+
+static unsigned int
+hb_icu_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs HB_UNUSED,
+ hb_codepoint_t u,
+ hb_codepoint_t *decomposed,
+ void *user_data HB_UNUSED)
+{
+ UChar utf16[2], normalized[2 * HB_UNICODE_MAX_DECOMPOSITION_LEN + 1];
+ unsigned int len;
+ int32_t utf32_len;
+ hb_bool_t err;
+ UErrorCode icu_err;
+
+ /* Copy @u into a UTF-16 array to be passed to ICU. */
+ len = 0;
+ err = false;
+ U16_APPEND (utf16, len, ARRAY_LENGTH (utf16), u, err);
+ if (err)
+ return 0;
+
+ /* Normalise the codepoint using NFKD mode. */
+ icu_err = U_ZERO_ERROR;
+ len = unorm_normalize (utf16, len, UNORM_NFKD, 0, normalized, ARRAY_LENGTH (normalized), &icu_err);
+ if (icu_err)
+ return 0;
+
+ /* Convert the decomposed form from UTF-16 to UTF-32. */
+ icu_err = U_ZERO_ERROR;
+ u_strToUTF32 ((UChar32*) decomposed, HB_UNICODE_MAX_DECOMPOSITION_LEN, &utf32_len, normalized, len, &icu_err);
+ if (icu_err)
+ return 0;
+
+ return utf32_len;
+}
+
+
+hb_unicode_funcs_t *
+hb_icu_get_unicode_funcs (void)
+{
+ static const hb_unicode_funcs_t _hb_icu_unicode_funcs = {
+ HB_OBJECT_HEADER_STATIC,
+
+ NULL, /* parent */
+ true, /* immutable */
+ {
+#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_icu_unicode_##name,
+ HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_UNICODE_FUNC_IMPLEMENT
+ }
+ };
+
+#if U_ICU_VERSION_MAJOR_NUM >= 49
+ if (!hb_atomic_ptr_get (&normalizer)) {
+ UErrorCode icu_err = U_ZERO_ERROR;
+ /* We ignore failure in getNFCInstace(). */
+ (void) hb_atomic_ptr_cmpexch (&normalizer, NULL, unorm2_getNFCInstance (&icu_err));
+ }
+#endif
+ return const_cast<hb_unicode_funcs_t *> (&_hb_icu_unicode_funcs);
+}