/* Emacs regular expression API Copyright (C) 1985, 1989-1993, 1995, 2000-2023 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #ifndef EMACS_REGEX_H #define EMACS_REGEX_H 1 #include /* This is the structure we store register match data in. Declare this before including lisp.h, since lisp.h (via thread.h) uses struct re_registers. */ struct re_registers { ptrdiff_t num_regs; ptrdiff_t *start; ptrdiff_t *end; }; #include "lisp.h" /* The string or buffer being matched. It is used for looking up syntax properties. If the value is a Lisp string object, match text in that string; if it's nil, match text in the current buffer; if it's t, match text in a C string. This value is effectively another parameter to re_search_2 and re_match_2. No calls into Lisp or thread switches are allowed before setting re_match_object and calling into the regex search and match functions. These functions capture the current value of re_match_object into gl_state on entry. TODO: turn into an actual function parameter. */ extern Lisp_Object re_match_object; /* Maximum value for Vregexp_max_backtracking_depth. This is roughly the maximum allowed number of failure points on the stack. It would be exactly that if failure always used TYPICAL_FAILURE_SIZE items. */ #define max_regexp_max_backtracking_depth 40000 /* Amount of memory that we can safely stack allocate. */ extern ptrdiff_t emacs_re_safe_alloca; /* This data structure represents a compiled pattern. Before calling the pattern compiler, the fields 'buffer', 'allocated', 'fastmap', and 'translate' can be set. After the pattern has been compiled, the 're_nsub' field is available. All other fields are private to the regex routines. */ struct re_pattern_buffer { /* Space that holds the compiled pattern. It is declared as 'unsigned char *' because its elements are sometimes used as array indexes. */ unsigned char *buffer; /* Number of bytes to which 'buffer' points. */ ptrdiff_t allocated; /* Number of bytes actually used in 'buffer'. */ ptrdiff_t used; /* Charset of unibyte characters at compiling time. */ int charset_unibyte; /* Pointer to a fastmap, if any, otherwise zero. re_search uses the fastmap, if there is one, to skip over impossible starting points for matches. */ char *fastmap; /* Either a translate table to apply to all characters before comparing them, or zero for no translation. The translation applies to a pattern when it is compiled and to a string when it is matched. */ Lisp_Object translate; /* Number of subexpressions found by the compiler. */ ptrdiff_t re_nsub; /* True if and only if this pattern can match the empty string. Well, in truth it's used only in 're_search_2', to see whether or not we should use the fastmap, so we don't set this absolutely perfectly; see 're_compile_fastmap'. */ bool_bf can_be_null : 1; /* If REGS_UNALLOCATED, allocate space in the 'regs' structure for at least (re_nsub + 1) groups. If REGS_REALLOCATE, reallocate space if necessary. If REGS_FIXED, use what's there. */ unsigned regs_allocated : 2; /* Set to false when 'regex_compile' compiles a pattern; set to true by 're_compile_fastmap' if it updates the fastmap. */ bool_bf fastmap_accurate : 1; /* If true, the compilation of the pattern had to look up the syntax table, so the compiled pattern is valid for the current syntax table only. */ bool_bf used_syntax : 1; /* If true, multi-byte form in the regexp pattern should be recognized as a multibyte character. */ bool_bf multibyte : 1; /* If true, multi-byte form in the target of match should be recognized as a multibyte character. */ bool_bf target_multibyte : 1; }; /* Declarations for routines. */ /* Compile the regular expression PATTERN, with length LENGTH and syntax given by the global 're_syntax_options', into the buffer BUFFER. Return NULL if successful, and an error string if not. */ extern const char *re_compile_pattern (const char *pattern, ptrdiff_t length, bool posix_backtracking, const char *whitespace_regexp, struct re_pattern_buffer *buffer); /* Search in the string STRING (with length LENGTH) for the pattern compiled into BUFFER. Start searching at position START, for RANGE characters. Return the starting position of the match, -1 for no match, or -2 for an internal error. Also return register information in REGS (if REGS is non-null). */ extern ptrdiff_t re_search (struct re_pattern_buffer *buffer, const char *string, ptrdiff_t length, ptrdiff_t start, ptrdiff_t range, struct re_registers *regs); /* Like 're_search', but search in the concatenation of STRING1 and STRING2. Also, stop searching at index START + STOP. */ extern ptrdiff_t re_search_2 (struct re_pattern_buffer *buffer, const char *string1, ptrdiff_t length1, const char *string2, ptrdiff_t length2, ptrdiff_t start, ptrdiff_t range, struct re_registers *regs, ptrdiff_t stop); /* Like 're_search_2', but return how many characters in STRING the regexp in BUFFER matched, starting at position START. */ extern ptrdiff_t re_match_2 (struct re_pattern_buffer *buffer, const char *string1, ptrdiff_t length1, const char *string2, ptrdiff_t length2, ptrdiff_t start, struct re_registers *regs, ptrdiff_t stop); /* Set REGS to hold NUM_REGS registers, storing them in STARTS and ENDS. Subsequent matches using BUFFER and REGS will use this memory for recording register information. STARTS and ENDS must be allocated with malloc, and must each be at least 'NUM_REGS * sizeof (ptrdiff_t)' bytes long. If NUM_REGS == 0, then subsequent matches should allocate their own register data. Unless this function is called, the first search or match using PATTERN_BUFFER will allocate its own register data, without freeing the old data. */ extern void re_set_registers (struct re_pattern_buffer *buffer, struct re_registers *regs, ptrdiff_t num_regs, ptrdiff_t *starts, ptrdiff_t *ends); /* Character classes. */ typedef enum { RECC_ERROR = 0, RECC_ALNUM, RECC_ALPHA, RECC_WORD, RECC_GRAPH, RECC_PRINT, RECC_LOWER, RECC_UPPER, RECC_PUNCT, RECC_CNTRL, RECC_DIGIT, RECC_XDIGIT, RECC_BLANK, RECC_SPACE, RECC_MULTIBYTE, RECC_NONASCII, RECC_ASCII, RECC_UNIBYTE } re_wctype_t; extern bool re_iswctype (int ch, re_wctype_t cc); extern re_wctype_t re_wctype_parse (const unsigned char **strp, ptrdiff_t limit); #endif /* EMACS_REGEX_H */