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/*-------------------------------------------------------------------------
*
* regis.c
* Fast regex subset
*
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tsearch/regis.c,v 1.2 2007/11/15 22:25:16 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "tsearch/dicts/regis.h"
#include "tsearch/ts_locale.h"
bool
RS_isRegis(const char *str)
{
while (str && *str)
{
if (t_isalpha(str) ||
t_iseq(str, '[') ||
t_iseq(str, ']') ||
t_iseq(str, '^'))
str += pg_mblen(str);
else
return false;
}
return true;
}
#define RS_IN_ONEOF 1
#define RS_IN_ONEOF_IN 2
#define RS_IN_NONEOF 3
#define RS_IN_WAIT 4
static RegisNode *
newRegisNode(RegisNode *prev, int len)
{
RegisNode *ptr;
ptr = (RegisNode *) palloc0(RNHDRSZ + len + 1);
if (prev)
prev->next = ptr;
return ptr;
}
void
RS_compile(Regis *r, bool issuffix, char *str)
{
int len = strlen(str);
int state = RS_IN_WAIT;
char *c = (char *) str;
RegisNode *ptr = NULL;
memset(r, 0, sizeof(Regis));
r->issuffix = (issuffix) ? 1 : 0;
while (*c)
{
if (state == RS_IN_WAIT)
{
if (t_isalpha(c))
{
if (ptr)
ptr = newRegisNode(ptr, len);
else
ptr = r->node = newRegisNode(NULL, len);
COPYCHAR(ptr->data, c);
ptr->type = RSF_ONEOF;
ptr->len = pg_mblen(c);
}
else if (t_iseq(c, '['))
{
if (ptr)
ptr = newRegisNode(ptr, len);
else
ptr = r->node = newRegisNode(NULL, len);
ptr->type = RSF_ONEOF;
state = RS_IN_ONEOF;
}
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),
errmsg("invalid regis pattern: \"%s\"",
str)));
}
else if (state == RS_IN_ONEOF)
{
if (t_iseq(c, '^'))
{
ptr->type = RSF_NONEOF;
state = RS_IN_NONEOF;
}
else if (t_isalpha(c))
{
COPYCHAR(ptr->data, c);
ptr->len = pg_mblen(c);
state = RS_IN_ONEOF_IN;
}
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),
errmsg("invalid regis pattern: \"%s\"",
str)));
}
else if (state == RS_IN_ONEOF_IN || state == RS_IN_NONEOF)
{
if (t_isalpha(c))
{
COPYCHAR(ptr->data + ptr->len, c);
ptr->len += pg_mblen(c);
}
else if (t_iseq(c, ']'))
state = RS_IN_WAIT;
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),
errmsg("invalid regis pattern: \"%s\"",
str)));
}
else
elog(ERROR, "internal error in RS_compile: state %d", state);
c += pg_mblen(c);
}
ptr = r->node;
while (ptr)
{
r->nchar++;
ptr = ptr->next;
}
}
void
RS_free(Regis *r)
{
RegisNode *ptr = r->node,
*tmp;
while (ptr)
{
tmp = ptr->next;
pfree(ptr);
ptr = tmp;
}
r->node = NULL;
}
#ifdef TS_USE_WIDE
static bool
mb_strchr(char *str, char *c)
{
int clen = pg_mblen(c),
plen,
i;
char *ptr = str;
bool res = false;
clen = pg_mblen(c);
while (*ptr && !res)
{
plen = pg_mblen(ptr);
if (plen == clen)
{
i = plen;
res = true;
while (i--)
if (*(ptr + i) != *(c + i))
{
res = false;
break;
}
}
ptr += plen;
}
return res;
}
#else
#define mb_strchr(s,c) ( (strchr((s),*(c)) == NULL) ? false : true )
#endif
bool
RS_execute(Regis *r, char *str)
{
RegisNode *ptr = r->node;
char *c = str;
int len = 0;
while (*c)
{
len++;
c += pg_mblen(c);
}
if (len < r->nchar)
return 0;
c = str;
if (r->issuffix)
{
len -= r->nchar;
while (len-- > 0)
c += pg_mblen(c);
}
while (ptr)
{
switch (ptr->type)
{
case RSF_ONEOF:
if (mb_strchr((char *) ptr->data, c) != true)
return false;
break;
case RSF_NONEOF:
if (mb_strchr((char *) ptr->data, c) == true)
return false;
break;
default:
elog(ERROR, "unrecognized regis node type: %d", ptr->type);
}
ptr = ptr->next;
c += pg_mblen(c);
}
return true;
}
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