text: #ifndef REGENC_H
  #define REGENC_H
  /**********************************************************************
    regenc.h -  Oniguruma (regular expression library)
  **********************************************************************/
  /*-
   * Copyright (c) 2002-2020  K.Kosako
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #ifndef ONIGURUMA_EXPORT
  #define ONIGURUMA_EXPORT
  #endif
  
  #include "config.h"
  
  #ifndef ONIG_NO_STANDARD_C_HEADERS
  #include <stddef.h>
  #endif
  
  #ifdef ONIG_ESCAPE_UCHAR_COLLISION
  #undef ONIG_ESCAPE_UCHAR_COLLISION
  #endif
  
  #include "oniguruma.h"
  
  typedef struct {
    OnigCodePoint from;
    OnigCodePoint to;
  } OnigPairCaseFoldCodes;
  
  
  #ifndef NULL
  #define NULL   ((void* )0)
  #endif
  
  #ifndef TRUE
  #define TRUE    1
  #endif
  
  #ifndef FALSE
  #define FALSE   0
  #endif
  
  #ifndef ARG_UNUSED
  #if defined(__GNUC__)
  #  define ARG_UNUSED  __attribute__ ((unused))
  #else
  #  define ARG_UNUSED
  #endif
  #endif
  
  #define ONIG_IS_NULL(p)                    (((void*)(p)) == (void*)0)
  #define ONIG_IS_NOT_NULL(p)                (((void*)(p)) != (void*)0)
  #define ONIG_CHECK_NULL_RETURN(p)          if (ONIG_IS_NULL(p)) return NULL
  #define ONIG_CHECK_NULL_RETURN_VAL(p,val)  if (ONIG_IS_NULL(p)) return (val)
  
  #define MAX_CODE_POINT         (~((OnigCodePoint )0))
  #define ASCII_LIMIT            127
  #define NEWLINE_CODE           0x0a
  
  #define enclen(enc,p)          ONIGENC_MBC_ENC_LEN(enc,p)
  
  /* character types bit flag */
  #define BIT_CTYPE_NEWLINE  (1<< ONIGENC_CTYPE_NEWLINE)
  #define BIT_CTYPE_ALPHA    (1<< ONIGENC_CTYPE_ALPHA)
  #define BIT_CTYPE_BLANK    (1<< ONIGENC_CTYPE_BLANK)
  #define BIT_CTYPE_CNTRL    (1<< ONIGENC_CTYPE_CNTRL)
  #define BIT_CTYPE_DIGIT    (1<< ONIGENC_CTYPE_DIGIT)
  #define BIT_CTYPE_GRAPH    (1<< ONIGENC_CTYPE_GRAPH)
  #define BIT_CTYPE_LOWER    (1<< ONIGENC_CTYPE_LOWER)
  #define BIT_CTYPE_PRINT    (1<< ONIGENC_CTYPE_PRINT)
  #define BIT_CTYPE_PUNCT    (1<< ONIGENC_CTYPE_PUNCT)
  #define BIT_CTYPE_SPACE    (1<< ONIGENC_CTYPE_SPACE)
  #define BIT_CTYPE_UPPER    (1<< ONIGENC_CTYPE_UPPER)
  #define BIT_CTYPE_XDIGIT   (1<< ONIGENC_CTYPE_XDIGIT)
  #define BIT_CTYPE_WORD     (1<< ONIGENC_CTYPE_WORD)
  #define BIT_CTYPE_ALNUM    (1<< ONIGENC_CTYPE_ALNUM)
  #define BIT_CTYPE_ASCII    (1<< ONIGENC_CTYPE_ASCII)
  
  #define CTYPE_TO_BIT(ctype)  (1<<(ctype))
  #define CTYPE_IS_WORD_GRAPH_PRINT(ctype) \
    ((ctype) == ONIGENC_CTYPE_WORD || (ctype) == ONIGENC_CTYPE_GRAPH ||\
     (ctype) == ONIGENC_CTYPE_PRINT)
  
  
  typedef struct {
    UChar    *name;
    int       ctype;
    short int len;
  } PosixBracketEntryType;
  
  struct PropertyNameCtype {
    char *name;
    int ctype;
  };
  
  /* #define USE_CRNL_AS_LINE_TERMINATOR */
  #define USE_UNICODE_PROPERTIES
  #define USE_UNICODE_EXTENDED_GRAPHEME_CLUSTER
  #define USE_UNICODE_WORD_BREAK
  /* #define USE_UNICODE_CASE_FOLD_TURKISH_AZERI */
  /* #define USE_UNICODE_ALL_LINE_TERMINATORS */  /* see Unicode.org UTS #18 */
  
  
  #define ONIG_ENCODING_INIT_DEFAULT           ONIG_ENCODING_ASCII
  
  
  #define ENC_SKIP_OFFSET_1_OR_0             7
  
  #define ENC_FLAG_ASCII_COMPATIBLE      (1<<0)
  #define ENC_FLAG_UNICODE               (1<<1)
  #define ENC_FLAG_SKIP_OFFSET_MASK      (7<<2)
  #define ENC_FLAG_SKIP_OFFSET_0             0
  #define ENC_FLAG_SKIP_OFFSET_1         (1<<2)
  #define ENC_FLAG_SKIP_OFFSET_2         (2<<2)
  #define ENC_FLAG_SKIP_OFFSET_3         (3<<2)
  #define ENC_FLAG_SKIP_OFFSET_4         (4<<2)
  #define ENC_FLAG_SKIP_OFFSET_1_OR_0    (ENC_SKIP_OFFSET_1_OR_0<<2)
  
  #define ENC_GET_SKIP_OFFSET(enc) \
    (((enc)->flag & ENC_FLAG_SKIP_OFFSET_MASK)>>2)
  
  
  /* for encoding system implementation (internal) */
  extern int onigenc_end(void);
  extern int onigenc_ascii_apply_all_case_fold P_((OnigCaseFoldType flag, OnigApplyAllCaseFoldFunc f, void* arg));
  extern int onigenc_ascii_get_case_fold_codes_by_str P_((OnigCaseFoldType flag, const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem items[]));
  extern int onigenc_apply_all_case_fold_with_map P_((int map_size, const OnigPairCaseFoldCodes map[], int ess_tsett_flag, OnigCaseFoldType flag, OnigApplyAllCaseFoldFunc f, void* arg));
  extern int onigenc_get_case_fold_codes_by_str_with_map P_((int map_size, const OnigPairCaseFoldCodes map[], int ess_tsett_flag, OnigCaseFoldType flag, const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem items[]));
  extern int onigenc_not_support_get_ctype_code_range P_((OnigCtype ctype, OnigCodePoint* sb_out, const OnigCodePoint* ranges[]));
  extern int onigenc_is_mbc_newline_0x0a P_((const UChar* p, const UChar* end));
  
  
  /* methods for single byte encoding */
  extern int onigenc_ascii_mbc_case_fold P_((OnigCaseFoldType flag, const UChar** p, const UChar* end, UChar* lower));
  extern int onigenc_single_byte_mbc_enc_len P_((const UChar* p));
  extern OnigCodePoint onigenc_single_byte_mbc_to_code P_((const UChar* p, const UChar* end));
  extern int onigenc_single_byte_code_to_mbclen P_((OnigCodePoint code));
  extern int onigenc_single_byte_code_to_mbc P_((OnigCodePoint code, UChar *buf));
  extern UChar* onigenc_single_byte_left_adjust_char_head P_((const UChar* start, const UChar* s));
  extern int onigenc_always_true_is_allowed_reverse_match P_((const UChar* s, const UChar* end));
  extern int onigenc_always_false_is_allowed_reverse_match P_((const UChar* s, const UChar* end));
  extern int onigenc_always_true_is_valid_mbc_string P_((const UChar* s, const UChar* end));
  extern int onigenc_length_check_is_valid_mbc_string P_((OnigEncoding enc, const UChar* s, const UChar* end));
  
  /* methods for multi byte encoding */
  extern OnigCodePoint onigenc_mbn_mbc_to_code P_((OnigEncoding enc, const UChar* p, const UChar* end));
  extern int onigenc_mbn_mbc_case_fold P_((OnigEncoding enc, OnigCaseFoldType flag, const UChar** p, const UChar* end, UChar* lower));
  extern int onigenc_mb2_code_to_mbc P_((OnigEncoding enc, OnigCodePoint code, UChar *buf));
  extern int onigenc_minimum_property_name_to_ctype P_((OnigEncoding enc, UChar* p, UChar* end));
  extern int onigenc_unicode_property_name_to_ctype P_((OnigEncoding enc, UChar* p, UChar* end));
  extern int onigenc_is_mbc_word_ascii P_((OnigEncoding enc, UChar* s, const UChar* end));
  extern int onigenc_mb2_is_code_ctype P_((OnigEncoding enc, OnigCodePoint code, unsigned int ctype));
  extern int onigenc_mb4_code_to_mbc P_((OnigEncoding enc, OnigCodePoint code, UChar *buf));
  extern int onigenc_mb4_is_code_ctype P_((OnigEncoding enc, OnigCodePoint code, unsigned int ctype));
  extern struct PropertyNameCtype* onigenc_euc_jp_lookup_property_name P_((register const char *str, register size_t len));
  extern struct PropertyNameCtype* onigenc_sjis_lookup_property_name P_((register const char *str, register size_t len));
  
  /* in unicode.c */
  extern int onigenc_unicode_is_code_ctype P_((OnigCodePoint code, unsigned int ctype));
  extern int onigenc_utf16_32_get_ctype_code_range P_((OnigCtype ctype, OnigCodePoint *sb_out, const OnigCodePoint* ranges[]));
  extern int onigenc_unicode_ctype_code_range P_((OnigCtype ctype, const OnigCodePoint* ranges[]));
  extern int onigenc_unicode_get_case_fold_codes_by_str P_((OnigEncoding enc, OnigCaseFoldType flag, const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem items[]));
  extern int onigenc_unicode_mbc_case_fold P_((OnigEncoding enc, OnigCaseFoldType flag, const UChar** pp, const UChar* end, UChar* fold));
  extern int onigenc_unicode_apply_all_case_fold P_((OnigCaseFoldType flag, OnigApplyAllCaseFoldFunc f, void* arg));
  
  extern int onigenc_egcb_is_break_position P_((OnigEncoding enc, UChar* p, UChar* prev, const UChar* start, const UChar* end));
  
  #ifdef USE_UNICODE_WORD_BREAK
  extern int onigenc_wb_is_break_position P_((OnigEncoding enc, UChar* p, UChar* prev, const UChar* start, const UChar* end));
  #endif
  
  #define UTF16_IS_SURROGATE_FIRST(c)    (((c) & 0xfc) == 0xd8)
  #define UTF16_IS_SURROGATE_SECOND(c)   (((c) & 0xfc) == 0xdc)
  
  /* from unicode generated codes */
  #define FOLDS1_FOLD(i)         (OnigUnicodeFolds1 + (i))
  #define FOLDS2_FOLD(i)         (OnigUnicodeFolds2 + (i))
  #define FOLDS3_FOLD(i)         (OnigUnicodeFolds3 + (i))
  #define FOLDS1_UNFOLDS_NUM(i)  (OnigUnicodeFolds1[(i)+1])
  #define FOLDS2_UNFOLDS_NUM(i)  (OnigUnicodeFolds2[(i)+2])
  #define FOLDS3_UNFOLDS_NUM(i)  (OnigUnicodeFolds3[(i)+3])
  #define FOLDS1_UNFOLDS(i)      (OnigUnicodeFolds1 + (i) + 2)
  #define FOLDS2_UNFOLDS(i)      (OnigUnicodeFolds2 + (i) + 3)
  #define FOLDS3_UNFOLDS(i)      (OnigUnicodeFolds3 + (i) + 4)
  #define FOLDS1_NEXT_INDEX(i)   ((i) + 2 + OnigUnicodeFolds1[(i)+1])
  #define FOLDS2_NEXT_INDEX(i)   ((i) + 3 + OnigUnicodeFolds2[(i)+2])
  #define FOLDS3_NEXT_INDEX(i)   ((i) + 4 + OnigUnicodeFolds3[(i)+3])
  
  #define FOLDS_FOLD_ADDR_BUK(buk, addr) do {\
    if ((buk)->fold_len == 1)\
      addr = OnigUnicodeFolds1 + (buk)->index;\
    else if ((buk)->fold_len == 2)\
      addr = OnigUnicodeFolds2 + (buk)->index;\
    else if ((buk)->fold_len == 3)\
      addr = OnigUnicodeFolds3 + (buk)->index;\
    else\
      return ONIGERR_INVALID_CODE_POINT_VALUE;\
  } while (0)
  
  extern OnigCodePoint OnigUnicodeFolds1[];
  extern OnigCodePoint OnigUnicodeFolds2[];
  extern OnigCodePoint OnigUnicodeFolds3[];
  
  struct ByUnfoldKey {
    OnigCodePoint code;
    short int     index;
    short int     fold_len;
  };
  
  extern const struct ByUnfoldKey* onigenc_unicode_unfold_key(OnigCodePoint code);
  extern int onigenc_unicode_fold1_key(OnigCodePoint code[]);
  extern int onigenc_unicode_fold2_key(OnigCodePoint code[]);
  extern int onigenc_unicode_fold3_key(OnigCodePoint code[]);
  
  extern int onig_codes_cmp(OnigCodePoint a[], OnigCodePoint b[], int n);
  extern int onig_codes_byte_at(OnigCodePoint code[], int at);
  
  
  
  #define ONIGENC_ISO_8859_1_TO_LOWER_CASE(c) \
    OnigEncISO_8859_1_ToLowerCaseTable[c]
  #define ONIGENC_ISO_8859_1_TO_UPPER_CASE(c) \
    OnigEncISO_8859_1_ToUpperCaseTable[c]
  
  extern const UChar OnigEncISO_8859_1_ToLowerCaseTable[];
  extern const UChar OnigEncISO_8859_1_ToUpperCaseTable[];
  
  extern int
  onigenc_with_ascii_strncmp P_((OnigEncoding enc, const UChar* p, const UChar* end, const UChar* sascii /* ascii */, int n));
  extern UChar*
  onigenc_step P_((OnigEncoding enc, const UChar* p, const UChar* end, int n));
  
  /* defined in regexec.c, but used in enc/xxx.c */
  extern int  onig_is_in_code_range P_((const UChar* p, OnigCodePoint code));
  
  extern OnigEncoding  OnigEncDefaultCharEncoding;
  extern const UChar  OnigEncAsciiToLowerCaseTable[];
  extern const UChar  OnigEncAsciiToUpperCaseTable[];
  extern const unsigned short OnigEncAsciiCtypeTable[];
  
  
  #define ONIGENC_IS_ASCII_CODE(code)  ((code) < 0x80)
  #define ONIGENC_ASCII_CODE_TO_LOWER_CASE(c) OnigEncAsciiToLowerCaseTable[c]
  #define ONIGENC_ASCII_CODE_TO_UPPER_CASE(c) OnigEncAsciiToUpperCaseTable[c]
  #define ONIGENC_IS_ASCII_CODE_CTYPE(code,ctype) \
    ((OnigEncAsciiCtypeTable[code] & CTYPE_TO_BIT(ctype)) != 0)
  #define ONIGENC_IS_ASCII_CODE_WORD(code) \
    ((OnigEncAsciiCtypeTable[code] & CTYPE_TO_BIT(ONIGENC_CTYPE_WORD)) != 0)
  #define ONIGENC_IS_ASCII_CODE_CASE_AMBIG(code) \
   (ONIGENC_IS_ASCII_CODE_CTYPE(code, ONIGENC_CTYPE_UPPER) ||\
    ONIGENC_IS_ASCII_CODE_CTYPE(code, ONIGENC_CTYPE_LOWER))
  
  #define ONIGENC_IS_UNICODE_ENCODING(enc) \
    (((enc)->flag & ENC_FLAG_UNICODE) != 0)
  
  #define ONIGENC_IS_ASCII_COMPATIBLE_ENCODING(enc)  \
    (((enc)->flag & ENC_FLAG_ASCII_COMPATIBLE) != 0)
  
  #endif /* REGENC_H */
  