| /* Canonical composition of Unicode characters. |
| Copyright (C) 2002, 2006, 2009, 2011-2020 Free Software Foundation, Inc. |
| Written by Bruno Haible <bruno@clisp.org>, 2009. |
| |
| This program is free software: you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published |
| by the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| /* Specification. */ |
| #include "uninorm.h" |
| |
| #include <string.h> |
| |
| struct composition_rule { char codes[6]; unsigned int combined; }; |
| |
| #include "composition-table.h" |
| |
| ucs4_t |
| uc_composition (ucs4_t uc1, ucs4_t uc2) |
| { |
| if (uc1 < 0x12000 && uc2 < 0x12000) |
| { |
| if (uc2 >= 0x1161 && uc2 < 0x1161 + 21 |
| && uc1 >= 0x1100 && uc1 < 0x1100 + 19) |
| { |
| /* Hangul: Combine single letter L and single letter V to form |
| two-letter syllable LV. */ |
| return 0xAC00 + ((uc1 - 0x1100) * 21 + (uc2 - 0x1161)) * 28; |
| } |
| else if (uc2 > 0x11A7 && uc2 < 0x11A7 + 28 |
| && uc1 >= 0xAC00 && uc1 < 0xD7A4 && ((uc1 - 0xAC00) % 28) == 0) |
| { |
| /* Hangul: Combine two-letter syllable LV with single-letter T |
| to form three-letter syllable LVT. */ |
| return uc1 + (uc2 - 0x11A7); |
| } |
| else |
| { |
| #if 0 |
| unsigned int uc = MUL1 * uc1 * MUL2 * uc2; |
| unsigned int index1 = uc >> composition_header_0; |
| if (index1 < composition_header_1) |
| { |
| int lookup1 = u_composition.level1[index1]; |
| if (lookup1 >= 0) |
| { |
| unsigned int index2 = (uc >> composition_header_2) & composition_header_3; |
| int lookup2 = u_composition.level2[lookup1 + index2]; |
| if (lookup2 >= 0) |
| { |
| unsigned int index3 = (uc & composition_header_4); |
| unsigned int lookup3 = u_composition.level3[lookup2 + index3]; |
| if ((lookup3 >> 16) == uc2) |
| return lookup3 & ((1U << 16) - 1); |
| } |
| } |
| } |
| #else |
| char codes[6]; |
| const struct composition_rule *rule; |
| |
| codes[0] = (uc1 >> 16) & 0xff; |
| codes[1] = (uc1 >> 8) & 0xff; |
| codes[2] = uc1 & 0xff; |
| codes[3] = (uc2 >> 16) & 0xff; |
| codes[4] = (uc2 >> 8) & 0xff; |
| codes[5] = uc2 & 0xff; |
| |
| rule = gl_uninorm_compose_lookup (codes, 6); |
| if (rule != NULL) |
| return rule->combined; |
| #endif |
| } |
| } |
| return 0; |
| } |