зеркало из https://github.com/github/ruby.git
257 строки
7.1 KiB
C
257 строки
7.1 KiB
C
/**********************************************************************
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utf_16be.c - Oniguruma (regular expression library)
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**********************************************************************/
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/*-
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* Copyright (c) 2002-2008 K.Kosako <sndgk393 AT ybb DOT ne DOT jp>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "regenc.h"
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#define UTF16_IS_SURROGATE_FIRST(c) (((c) & 0xfc) == 0xd8)
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#define UTF16_IS_SURROGATE_SECOND(c) (((c) & 0xfc) == 0xdc)
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#define UTF16_IS_SURROGATE(c) (((c) & 0xf8) == 0xd8)
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static const int EncLen_UTF16[] = {
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4, 4, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
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};
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static int
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utf16be_mbc_enc_len(const UChar* p, const OnigUChar* e ARG_UNUSED,
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OnigEncoding enc ARG_UNUSED)
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{
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int byte = p[0];
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if (!UTF16_IS_SURROGATE(byte)) {
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if (2 <= e-p)
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return ONIGENC_CONSTRUCT_MBCLEN_CHARFOUND(2);
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else
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return ONIGENC_CONSTRUCT_MBCLEN_NEEDMORE(1);
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}
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if (UTF16_IS_SURROGATE_FIRST(byte)) {
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switch (e-p) {
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case 1: return ONIGENC_CONSTRUCT_MBCLEN_NEEDMORE(3);
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case 2: return ONIGENC_CONSTRUCT_MBCLEN_NEEDMORE(2);
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case 3:
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if (UTF16_IS_SURROGATE_SECOND(p[2]))
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return ONIGENC_CONSTRUCT_MBCLEN_NEEDMORE(1);
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break;
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default:
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if (UTF16_IS_SURROGATE_SECOND(p[2]))
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return ONIGENC_CONSTRUCT_MBCLEN_CHARFOUND(4);
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break;
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}
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}
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return ONIGENC_CONSTRUCT_MBCLEN_INVALID();
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}
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static int
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utf16be_is_mbc_newline(const UChar* p, const UChar* end,
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OnigEncoding enc)
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{
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if (p + 1 < end) {
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if (*(p+1) == 0x0a && *p == 0x00)
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return 1;
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#ifdef USE_UNICODE_ALL_LINE_TERMINATORS
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if ((*(p+1) == 0x0b || *(p+1) == 0x0c || *(p+1) == 0x0d || *(p+1) == 0x85)
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&& *p == 0x00)
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return 1;
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if (*p == 0x20 && (*(p+1) == 0x29 || *(p+1) == 0x28))
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return 1;
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#endif
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}
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return 0;
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}
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static OnigCodePoint
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utf16be_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED,
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OnigEncoding enc)
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{
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OnigCodePoint code;
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if (UTF16_IS_SURROGATE_FIRST(*p)) {
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code = ((((p[0] << 8) + p[1]) & 0x03ff) << 10)
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+ (((p[2] << 8) + p[3]) & 0x03ff) + 0x10000;
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}
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else {
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code = p[0] * 256 + p[1];
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}
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return code;
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}
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static int
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utf16be_code_to_mbclen(OnigCodePoint code,
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OnigEncoding enc)
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{
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return (code > 0xffff ? 4 : 2);
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}
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static int
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utf16be_code_to_mbc(OnigCodePoint code, UChar *buf,
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OnigEncoding enc)
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{
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UChar* p = buf;
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if (code > 0xffff) {
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unsigned int high = (code >> 10) + 0xD7C0;
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unsigned int low = (code & 0x3FF) + 0xDC00;
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*p++ = (high >> 8) & 0xFF;
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*p++ = high & 0xFF;
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*p++ = (low >> 8) & 0xFF;
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*p++ = low & 0xFF;
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return 4;
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}
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else {
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*p++ = (UChar )((code & 0xff00) >> 8);
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*p++ = (UChar )(code & 0xff);
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return 2;
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}
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}
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static int
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utf16be_mbc_case_fold(OnigCaseFoldType flag,
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const UChar** pp, const UChar* end, UChar* fold,
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OnigEncoding enc)
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{
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const UChar* p = *pp;
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if (ONIGENC_IS_ASCII_CODE(*(p+1)) && *p == 0) {
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p++;
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#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
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if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
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if (*p == 0x49) {
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*fold++ = 0x01;
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*fold = 0x31;
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(*pp) += 2;
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return 2;
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}
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}
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#endif
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*fold++ = 0;
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*fold = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
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*pp += 2;
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return 2;
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}
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else
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return onigenc_unicode_mbc_case_fold(enc, flag,
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pp, end, fold);
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}
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#if 0
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static int
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utf16be_is_mbc_ambiguous(OnigCaseFoldType flag, const UChar** pp, const UChar* end)
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{
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const UChar* p = *pp;
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(*pp) += EncLen_UTF16[*p];
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if (*p == 0) {
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int c, v;
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p++;
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if (*p == 0xdf && (flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0) {
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return TRUE;
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}
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c = *p;
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v = ONIGENC_IS_UNICODE_ISO_8859_1_BIT_CTYPE(c,
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(BIT_CTYPE_UPPER | BIT_CTYPE_LOWER));
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if ((v | BIT_CTYPE_LOWER) != 0) {
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/* 0xaa, 0xb5, 0xba are lower case letter, but can't convert. */
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if (c >= 0xaa && c <= 0xba)
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return FALSE;
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else
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return TRUE;
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}
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return (v != 0 ? TRUE : FALSE);
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}
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return FALSE;
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}
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#endif
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static UChar*
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utf16be_left_adjust_char_head(const UChar* start, const UChar* s, const UChar* end,
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OnigEncoding enc ARG_UNUSED)
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{
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if (s <= start) return (UChar* )s;
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if ((s - start) % 2 == 1) {
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s--;
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}
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if (UTF16_IS_SURROGATE_SECOND(*s) && s > start + 1)
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s -= 2;
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return (UChar* )s;
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}
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static int
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utf16be_get_case_fold_codes_by_str(OnigCaseFoldType flag,
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const OnigUChar* p, const OnigUChar* end,
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OnigCaseFoldCodeItem items[],
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OnigEncoding enc)
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{
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return onigenc_unicode_get_case_fold_codes_by_str(enc,
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flag, p, end, items);
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}
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OnigEncodingDefine(utf_16be, UTF_16BE) = {
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utf16be_mbc_enc_len,
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"UTF-16BE", /* name */
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4, /* max byte length */
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2, /* min byte length */
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utf16be_is_mbc_newline,
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utf16be_mbc_to_code,
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utf16be_code_to_mbclen,
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utf16be_code_to_mbc,
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utf16be_mbc_case_fold,
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onigenc_unicode_apply_all_case_fold,
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utf16be_get_case_fold_codes_by_str,
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onigenc_unicode_property_name_to_ctype,
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onigenc_unicode_is_code_ctype,
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onigenc_utf16_32_get_ctype_code_range,
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utf16be_left_adjust_char_head,
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onigenc_always_false_is_allowed_reverse_match,
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0,
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ONIGENC_FLAG_UNICODE,
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};
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ENC_ALIAS("UCS-2BE", "UTF-16BE")
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