diff options
Diffstat (limited to 'src/include/regex/regguts.h')
| -rw-r--r-- | src/include/regex/regguts.h | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/src/include/regex/regguts.h b/src/include/regex/regguts.h index 19fe991c74f..2ceffa6563b 100644 --- a/src/include/regex/regguts.h +++ b/src/include/regex/regguts.h @@ -89,13 +89,19 @@ */ #define NOTREACHED 0 -#define xxx 1 #define DUPMAX _POSIX2_RE_DUP_MAX #define DUPINF (DUPMAX+1) #define REMAGIC 0xfed7 /* magic number for main struct */ +/* Type codes for lookaround constraints */ +#define LATYPE_AHEAD_POS 03 /* positive lookahead */ +#define LATYPE_AHEAD_NEG 02 /* negative lookahead */ +#define LATYPE_BEHIND_POS 01 /* positive lookbehind */ +#define LATYPE_BEHIND_NEG 00 /* negative lookbehind */ +#define LATYPE_IS_POS(la) ((la) & 01) +#define LATYPE_IS_AHEAD(la) ((la) & 02) /* @@ -351,7 +357,7 @@ struct nfa * * The non-dummy carc structs are of two types: plain arcs and LACON arcs. * Plain arcs just store the transition color number as "co". LACON arcs - * store the lookahead constraint number plus cnfa.ncolors as "co". LACON + * store the lookaround constraint number plus cnfa.ncolors as "co". LACON * arcs can be distinguished from plain by testing for co >= cnfa.ncolors. */ struct carc @@ -365,7 +371,7 @@ struct cnfa int nstates; /* number of states */ int ncolors; /* number of colors (max color in use + 1) */ int flags; -#define HASLACONS 01 /* uses lookahead constraints */ +#define HASLACONS 01 /* uses lookaround constraints */ int pre; /* setup state number */ int post; /* teardown state number */ color bos[2]; /* colors, if any, assigned to BOS and BOL */ @@ -433,7 +439,8 @@ struct subre #define PREF2(f1, f2) ((PREF(f1) != 0) ? PREF(f1) : PREF(f2)) #define COMBINE(f1, f2) (UP((f1)|(f2)) | PREF2(f1, f2)) short id; /* ID of subre (1..ntree-1) */ - int subno; /* subexpression number (for 'b' and '(') */ + int subno; /* subexpression number for 'b' and '(', or + * LATYPE code for lookaround constraint */ short min; /* min repetitions for iteration or backref */ short max; /* max repetitions for iteration or backref */ struct subre *left; /* left child, if any (also freelist chain) */ @@ -479,6 +486,7 @@ struct guts int ntree; /* number of subre's, plus one */ struct colormap cmap; int FUNCPTR(compare, (const chr *, const chr *, size_t)); - struct subre *lacons; /* lookahead-constraint vector */ - int nlacons; /* size of lacons */ + struct subre *lacons; /* lookaround-constraint vector */ + int nlacons; /* size of lacons[]; note that only slots + * numbered 1 .. nlacons-1 are used */ }; |