| /* |
| * Copyright (C) 2009 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include "PhoneticStringUtils.h" |
| #include <utils/String8.h> |
| |
| // We'd like 0 length string last of sorted list. So when input string is NULL |
| // or 0 length string, we use these instead. |
| #define CODEPOINT_FOR_NULL_STR 0xFFFD |
| #define STR_FOR_NULL_STR "\xEF\xBF\xBD" |
| |
| // We assume that users will not notice strings not sorted properly when the |
| // first 128 characters are the same. |
| #define MAX_CODEPOINTS 128 |
| |
| namespace android { |
| |
| // Get hiragana from halfwidth katakana. |
| static int GetHiraganaFromHalfwidthKatakana(char32_t codepoint, |
| char32_t next_codepoint, |
| bool *next_is_consumed) { |
| if (codepoint < 0xFF66 || 0xFF9F < codepoint) { |
| return codepoint; |
| } |
| |
| switch (codepoint) { |
| case 0xFF66: // wo |
| return 0x3092; |
| case 0xFF67: // xa |
| return 0x3041; |
| case 0xFF68: // xi |
| return 0x3043; |
| case 0xFF69: // xu |
| return 0x3045; |
| case 0xFF6A: // xe |
| return 0x3047; |
| case 0xFF6B: // xo |
| return 0x3049; |
| case 0xFF6C: // xya |
| return 0x3083; |
| case 0xFF6D: // xyu |
| return 0x3085; |
| case 0xFF6E: // xyo |
| return 0x3087; |
| case 0xFF6F: // xtsu |
| return 0x3063; |
| case 0xFF70: // - |
| return 0x30FC; |
| case 0xFF9C: // wa |
| return 0x308F; |
| case 0xFF9D: // n |
| return 0x3093; |
| break; |
| default: { |
| if (0xFF71 <= codepoint && codepoint <= 0xFF75) { |
| // a, i, u, e, o |
| if (codepoint == 0xFF73 && next_codepoint == 0xFF9E) { |
| if (next_is_consumed != NULL) { |
| *next_is_consumed = true; |
| } |
| return 0x3094; // vu |
| } else { |
| return 0x3042 + (codepoint - 0xFF71) * 2; |
| } |
| } else if (0xFF76 <= codepoint && codepoint <= 0xFF81) { |
| // ka - chi |
| if (next_codepoint == 0xFF9E) { |
| // "dakuten" (voiced mark) |
| if (next_is_consumed != NULL) { |
| *next_is_consumed = true; |
| } |
| return 0x304B + (codepoint - 0xFF76) * 2 + 1; |
| } else { |
| return 0x304B + (codepoint - 0xFF76) * 2; |
| } |
| } else if (0xFF82 <= codepoint && codepoint <= 0xFF84) { |
| // tsu, te, to (skip xtsu) |
| if (next_codepoint == 0xFF9E) { |
| // "dakuten" (voiced mark) |
| if (next_is_consumed != NULL) { |
| *next_is_consumed = true; |
| } |
| return 0x3064 + (codepoint - 0xFF82) * 2 + 1; |
| } else { |
| return 0x3064 + (codepoint - 0xFF82) * 2; |
| } |
| } else if (0xFF85 <= codepoint && codepoint <= 0xFF89) { |
| // na, ni, nu, ne, no |
| return 0x306A + (codepoint - 0xFF85); |
| } else if (0xFF8A <= codepoint && codepoint <= 0xFF8E) { |
| // ha, hi, hu, he, ho |
| if (next_codepoint == 0xFF9E) { |
| // "dakuten" (voiced mark) |
| if (next_is_consumed != NULL) { |
| *next_is_consumed = true; |
| } |
| return 0x306F + (codepoint - 0xFF8A) * 3 + 1; |
| } else if (next_codepoint == 0xFF9F) { |
| // "han-dakuten" (half voiced mark) |
| if (next_is_consumed != NULL) { |
| *next_is_consumed = true; |
| } |
| return 0x306F + (codepoint - 0xFF8A) * 3 + 2; |
| } else { |
| return 0x306F + (codepoint - 0xFF8A) * 3; |
| } |
| } else if (0xFF8F <= codepoint && codepoint <= 0xFF93) { |
| // ma, mi, mu, me, mo |
| return 0x307E + (codepoint - 0xFF8F); |
| } else if (0xFF94 <= codepoint && codepoint <= 0xFF96) { |
| // ya, yu, yo |
| return 0x3084 + (codepoint - 0xFF94) * 2; |
| } else if (0xFF97 <= codepoint && codepoint <= 0xFF9B) { |
| // ra, ri, ru, re, ro |
| return 0x3089 + (codepoint - 0xFF97); |
| } |
| // Note: 0xFF9C, 0xFF9D are handled above |
| } // end of default |
| } |
| |
| return codepoint; |
| } |
| |
| // Assuming input is hiragana, convert the hiragana to "normalized" hiragana. |
| static int GetNormalizedHiragana(int codepoint) { |
| if (codepoint < 0x3040 || 0x309F < codepoint) { |
| return codepoint; |
| } |
| |
| // TODO: should care (semi-)voiced mark (0x3099, 0x309A). |
| |
| // Trivial kana conversions. |
| // e.g. xa => a |
| switch (codepoint) { |
| case 0x3041: |
| case 0x3043: |
| case 0x3045: |
| case 0x3047: |
| case 0x3049: |
| case 0x308E: // xwa |
| return codepoint + 1; |
| case 0x3095: // xka |
| return 0x304B; |
| case 0x3096: // xku |
| return 0x304F; |
| default: |
| return codepoint; |
| } |
| } |
| |
| static int GetNormalizedKana(char32_t codepoint, |
| char32_t next_codepoint, |
| bool *next_is_consumed) { |
| // First, convert fullwidth katakana and halfwidth katakana to hiragana. |
| if (0x30A1 <= codepoint && codepoint <= 0x30F6) { |
| // Make fullwidth katakana same as hiragana. |
| // 96 == 0x30A1 - 0x3041c |
| codepoint = codepoint - 96; |
| } else { |
| codepoint = GetHiraganaFromHalfwidthKatakana( |
| codepoint, next_codepoint, next_is_consumed); |
| } |
| |
| // Normalize Hiragana. |
| return GetNormalizedHiragana(codepoint); |
| } |
| |
| int GetPhoneticallySortableCodePoint(char32_t codepoint, |
| char32_t next_codepoint, |
| bool *next_is_consumed) { |
| if (next_is_consumed != NULL) { |
| *next_is_consumed = false; |
| } |
| |
| if (codepoint <= 0x0020 || codepoint == 0x3000) { |
| // Whitespace should be ignored. |
| // Note: Formally, more "whitespace" exist. This block only |
| // handles part of them |
| return -1; |
| } else if ((0x0021 <= codepoint && codepoint <= 0x007E) || |
| (0xFF01 <= codepoint && codepoint <= 0xFF5E)) { |
| // Ascii and fullwidth ascii |
| |
| if (0x0021 <= codepoint && codepoint <= 0x007E) { |
| // Convert ascii to fullwidth ascii so that they become |
| // behind hiragana. |
| // 65248 = 0xFF01 - 0x0021 |
| codepoint += 65248; |
| } |
| |
| // Now, there is only fullwidth ascii. |
| if (0xFF10 <= codepoint && codepoint <= 0xFF19) { |
| // Numbers should be after alphabets but before symbols. |
| // 86 = 0xFF66 |
| // (the beginning of halfwidth-katakankana space) - 0xFF10 |
| return codepoint + 86; |
| } else if (0xFF41 <= codepoint && codepoint <= 0xFF5A) { |
| // Make lower alphabets same as capital alphabets. |
| // 32 = 0xFF41 - 0xFF21 |
| return codepoint - 32; |
| } else if (0xFF01 <= codepoint && codepoint <= 0xFF0F) { |
| // Symbols (Ascii except alphabet nor number) |
| // These should be at the end of sorting, just after numebers |
| // (see below) |
| // |
| // We use halfwidth-katakana space for storing those symbols. |
| // 111 = 0xFF70 (0xFF19 + 86 + 1) - 0xFF01 |
| return codepoint + 111; |
| } else if (0xFF1A <= codepoint && codepoint <= 0xFF20) { |
| // Symbols (cont.) |
| // 101 = 0xFF7F (0xFF0F + 111 + 1) - 0xFF1A |
| return codepoint + 101; |
| } else if (0xFF3B <= codepoint && codepoint <= 0xFF40) { |
| // Symbols (cont.) |
| // 75 = 0xFF86 (0xFF20 + 101 + 1) - 0xFF3B (= 101 - 26) |
| return codepoint + 75; |
| } else if (0xFF5B <= codepoint && codepoint <= 0xFF5E) { |
| // Symbols (cont.) |
| // 49 = 0xFF8C (0xFF40 + 75 + 1) - 0xFF5B (= 75 - 26) |
| return codepoint + 49; |
| } else { |
| return codepoint; |
| } |
| } else if (codepoint == 0x02DC || codepoint == 0x223C) { |
| // tilde |
| return 0xFF5E; |
| } else if (codepoint <= 0x3040 || |
| (0x3100 <= codepoint && codepoint < 0xFF00) || |
| codepoint == CODEPOINT_FOR_NULL_STR) { |
| // Move Kanji and other non-Japanese characters behind symbols. |
| return codepoint + 0x10000; |
| } |
| |
| // Below is Kana-related handling. |
| |
| return GetNormalizedKana(codepoint, next_codepoint, next_is_consumed); |
| } |
| |
| int GetNormalizedCodePoint(char32_t codepoint, |
| char32_t next_codepoint, |
| bool *next_is_consumed) { |
| if (next_is_consumed != NULL) { |
| *next_is_consumed = false; |
| } |
| |
| if (codepoint <= 0x0020 || codepoint == 0x3000) { |
| // Whitespaces. Keep it as is. |
| return codepoint; |
| } else if ((0x0021 <= codepoint && codepoint <= 0x007E) || |
| (0xFF01 <= codepoint && codepoint <= 0xFF5E)) { |
| // Ascii and fullwidth ascii. Keep it as is |
| return codepoint; |
| } else if (codepoint == 0x02DC || codepoint == 0x223C) { |
| // tilde |
| return 0xFF5E; |
| } else if (codepoint <= 0x3040 || |
| (0x3100 <= codepoint && codepoint < 0xFF00) || |
| codepoint == CODEPOINT_FOR_NULL_STR) { |
| // Keep it as is. |
| return codepoint; |
| } |
| |
| // Below is Kana-related handling. |
| |
| return GetNormalizedKana(codepoint, next_codepoint, next_is_consumed); |
| } |
| |
| static bool GetExpectedString( |
| const char *src, char **dst, size_t *dst_len, |
| int (*get_codepoint_function)(char32_t, char32_t, bool*)) { |
| if (dst == NULL || dst_len == NULL) { |
| return false; |
| } |
| |
| if (src == NULL || *src == '\0') { |
| src = STR_FOR_NULL_STR; |
| } |
| |
| char32_t codepoints[MAX_CODEPOINTS]; // if array size is changed the for loop needs to be changed |
| |
| size_t src_len = utf8_length(src); |
| if (src_len == 0) { |
| return false; |
| } |
| bool next_is_consumed; |
| size_t j = 0; |
| for (size_t i = 0; i < src_len && j < MAX_CODEPOINTS;) { |
| int32_t ret = utf32_at(src, src_len, i, &i); |
| if (ret < 0) { |
| // failed to parse UTF-8 |
| return false; |
| } |
| ret = get_codepoint_function( |
| static_cast<char32_t>(ret), |
| i + 1 < src_len ? src[i + 1] : 0, |
| &next_is_consumed); |
| if (ret > 0) { |
| codepoints[j] = static_cast<char32_t>(ret); |
| j++; |
| } |
| if (next_is_consumed) { |
| i++; |
| } |
| } |
| size_t length = j; |
| |
| if (length == 0) { |
| // If all of codepoints are invalid, we place the string at the end of |
| // the list. |
| codepoints[0] = 0x10000 + CODEPOINT_FOR_NULL_STR; |
| length = 1; |
| } |
| |
| size_t new_len = utf8_length_from_utf32(codepoints, length); |
| *dst = static_cast<char *>(malloc(new_len + 1)); |
| if (*dst == NULL) { |
| return false; |
| } |
| |
| if (utf32_to_utf8(codepoints, length, *dst, new_len + 1) != new_len) { |
| free(*dst); |
| *dst = NULL; |
| return false; |
| } |
| |
| *dst_len = new_len; |
| return true; |
| } |
| |
| bool GetPhoneticallySortableString(const char *src, char **dst, size_t *len) { |
| return GetExpectedString(src, dst, len, GetPhoneticallySortableCodePoint); |
| } |
| |
| bool GetNormalizedString(const char *src, char **dst, size_t *len) { |
| return GetExpectedString(src, dst, len, GetNormalizedCodePoint); |
| } |
| |
| } // namespace android |
