Usenet 1994 January/usenetsourcesnewsgroupsinfomagicjanuary1994.iso/sources/x/volume3/xdbx/part02/regex.h

C/C++ Source or Header | 1989-03-14 | 10.6 KB | 232 lines

/* Definitions for data structures callers pass the regex library.
   Copyright (C) 1985 Free Software Foundation, Inc.

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  5. If you wish to incorporate parts of this program into other free
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#ifndef RE_NREGS
#define RE_NREGS 10
#endif

/* This data structure is used to represent a compiled pattern. */

struct re_pattern_buffer
  {
    char *buffer;    /* Space holding the compiled pattern commands. */
    int allocated;    /* Size of space that  buffer  points to */
    int used;        /* Length of portion of buffer actually occupied */
    char *fastmap;    /* Pointer to fastmap, if any, or zero if none. */
            /* re_search uses the fastmap, if there is one,
               to skip quickly over totally implausible characters */
    char *translate;    /* Translate table to apply to all characters
                           before comparing.
               Or zero for no translation.
               The translation is applied to a pattern when it is compiled
               and to data when it is matched. */
    char fastmap_accurate;
            /* Set to zero when a new pattern is stored,
               set to one when the fastmap is updated from it. */
    char can_be_null;   /* Set to one by compiling fastmap
               if this pattern might match the null string.
               It does not necessarily match the null string
               in that case, but if this is zero, it cannot.
               2 as value means can match null string
               but at end of range or before a character
               listed in the fastmap.  */
  };

/* Structure to store "register" contents data in.

   Pass the address of such a structure as an argument to re_match, etc.,
   if you want this information back.

   start[i] and end[i] record the string matched by \( ... \) grouping i,
   for i from 1 to RE_NREGS - 1.
   start[0] and end[0] record the entire string matched. */

struct re_registers
  {
    int start[RE_NREGS];
    int end[RE_NREGS];
  };

/* These are the command codes that appear in compiled regular expressions,
  one per byte.
  Some command codes are followed by argument bytes.
  A command code can specify any interpretation whatever for its arguments.
  Zero-bytes may appear in the compiled regular expression. */

enum regexpcode
  {
    unused,
    exactn,    /* followed by one byte giving n, and then by n literal bytes */
    begline,   /* fails unless at beginning of line */
    endline,   /* fails unless at end of line */
    jump,     /* followed by two bytes giving relative address to jump to */
    on_failure_jump,     /* followed by two bytes giving relative address of place
                    to resume at in case of failure. */
    finalize_jump,     /* Throw away latest failure point and then
                jump to address. */
    maybe_finalize_jump, /* Like jump but finalize if safe to do so.
                This is used to jump back to the beginning
                of a repeat.  If the command that follows
                this jump is clearly incompatible with the
                one at the beginning of the repeat, such that
                we can be sure that there is no use backtracking
                out of repetitions already completed,
                then we finalize. */
    dummy_failure_jump,  /* jump, and push a dummy failure point.
                This failure point will be thrown away
                if an attempt is made to use it for a failure.
                A + construct makes this before the first repeat.  */
    anychar,     /* matches any one character */
    charset,     /* matches any one char belonging to specified set.
            First following byte is # bitmap bytes.
            Then come bytes for a bit-map saying which chars are in.
            Bits in each byte are ordered low-bit-first.
            A character is in the set if its bit is 1.
            A character too large to have a bit in the map
            is automatically not in the set */
    charset_not, /* similar but match any character that is NOT one
                    of those specified */
    start_memory, /* starts remembering the text that is matched
            and stores it in a memory register.
            followed by one byte containing the register number.
            Register numbers must be in the range 0 through NREGS. */
    stop_memory, /* stops remembering the text that is matched
            and stores it in a memory register.
            followed by one byte containing the register number.
            Register numbers must be in the range 0 through NREGS. */
    duplicate,    /* match a duplicate of something remembered.
            Followed by one byte containing the index of the memory register. */
    before_dot,     /* Succeeds if before dot */
    at_dot,     /* Succeeds if at dot */
    after_dot,     /* Succeeds if after dot */
    begbuf,      /* Succeeds if at beginning of buffer */
    endbuf,      /* Succeeds if at end of buffer */
    wordchar,    /* Matches any word-constituent character */
    notwordchar, /* Matches any char that is not a word-constituent */
    wordbeg,     /* Succeeds if at word beginning */
    wordend,     /* Succeeds if at word end */
    wordbound,   /* Succeeds if at a word boundary */
    notwordbound, /* Succeeds if not at a word boundary */
    syntaxspec,  /* Matches any character whose syntax is specified.
            followed by a byte which contains a syntax code, Sword
                or such like */
    notsyntaxspec /* Matches any character whose syntax differs from
                     the specified. */
  };

extern char *re_compile_pattern ();
/* Is this really advertised? */
extern void re_compile_fastmap ();
extern int re_search (), re_search_2 ();
extern int re_match (), re_match_2 ();

/* 4.2 bsd compatibility (yuck) */
extern char *re_comp ();
extern int re_exec ();

#ifdef SYNTAX_TABLE
extern char *re_syntax_table;
#endif