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// -*-c++-*-
/* $Id: rxx.h,v 1.9 2001/08/20 22:38:04 dm Exp $ */
/*
*
* Copyright (C) 1998 David Mazieres (dm@uun.org)
*
* 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 2, 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*/
#ifndef _RXX_H_
#define _RXX_H_ 1
#include "sysconf.h"
extern "C" {
#include "pcre.h"
}
#include "str.h"
#include "init.h"
INIT (rxxinit);
extern "C" void *rcmalloc (size_t n);
extern "C" void rcfree (void *p);
extern "C" void *rccopy (void *p);
class rxx {
protected:
pcre *re;
pcre_extra *extra;
int nsubpat;
int *ovector;
int ovecsize;
str subj;
str init (const char *pat, const char *opt);
void copy (const rxx &r) {
re = static_cast<pcre *> (rccopy (r.re));
extra = static_cast<pcre_extra *> (rccopy (r.extra));
nsubpat = 0;
ovector = NULL;
ovecsize = r.ovecsize;
}
rxx &operator= (const rxx &);
void mknull () {
re = NULL;
extra = NULL;
nsubpat = 0;
ovector = NULL;
ovecsize = NULL;
subj = NULL;
}
rxx () {}
public:
void _exec (const char *p, size_t len, int options);
void exec (str s, int options);
class matchresult {
const rxx &r;
public:
matchresult (const rxx &r) : r (r) {}
operator bool () const { return r.success (); }
operator str () const { return r.at (0); }
str operator[] (ptrdiff_t n) const { return r.at (n); }
};
rxx (const char *pat, const char *opt = "")
{ if (str s = init (pat, opt)) panic ("%s", s.cstr ()); }
rxx (const rxx &r) { assert (r.re); copy (r); }
~rxx () { rcfree (re); rcfree (extra); delete[] ovector; }
void study () { extra = pcre_study (re, 0, NULL); }
void clear () { nsubpat = 0; subj = NULL; }
matchresult search (str s, int opt = 0) { exec (s, opt); return *this; }
matchresult match (str s, int opt = 0) {
exec (s, opt | PCRE_ANCHORED);
if (nsubpat > 0 && implicit_cast<size_t> (ovector[1]) != s.len ())
nsubpat = 0;
return *this;
}
bool success () const { return nsubpat > 0; }
str at (ptrdiff_t n) const;
int start (int n) const
{ assert (n >= 0); return n < nsubpat ? ovector[2*n] : -1; }
int end (int n) const
{ assert (n >= 0); return n < nsubpat ? ovector[2*n+1] : -1; }
int len (int n) const {
assert (n >= 0);
size_t i = 2 * n;
return n < nsubpat && ovector[i] >= 0
? ovector[i+1] - ovector[i] : -1;
}
str operator[] (ptrdiff_t n) const { return at (n); }
};
class rrxx : public rxx {
str err;
void mknull () { err = "uninitialized"; rxx::mknull (); }
public:
rrxx () { mknull (); }
explicit rrxx (const char *pat, const char *opt = "")
{ err = init (pat, opt); }
rrxx (const rxx &r) { err = NULL; copy (r); }
rrxx (const rrxx &r) { err = r.err; copy (r); }
bool compile (const char *pat, const char *opt = "")
{ this->~rrxx (); mknull (); err = init (pat, opt); return !err; }
const str &geterr () const { return err; }
};
inline rxx::matchresult
operator/ (const str &s, rxx &r)
{
return r.search (s);
}
class strstrmatch {
const str &s;
const char *const p;
protected:
mutable const char *o;
public:
strstrmatch (const str &s, const char *p)
: s (s), p (p), o ("") {}
operator bool () const
{ rxx r (p, o); return r.search (s); }
operator str () const
{ rxx r (p, o); return r.search (s)[0]; }
str operator[] (ptrdiff_t n) const
{ rxx r (p, o); return r.search (s)[n]; }
};
class strstroptmatch : public strstrmatch {
public:
strstroptmatch (const str &s, const char *p)
: strstrmatch (s, p) {}
const strstrmatch &operator/ (const char *opt) const
{ o = opt; return *this; }
};
inline strstroptmatch
operator/ (const str &s, const char *p)
{
return strstroptmatch (s, p);
}
int split (vec<str> *out, rxx pat, str expr, size_t lim = (size_t) -1);
str join (str sep, const vec<str> &v);
#endif /* !_RXX_H_ */
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