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/* Copyright (c) 2004, 2013, Oracle and/or its affiliates.
Copyright (c) 2009, 2021, MariaDB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; version 2
of the License.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1335 USA */
#ifdef SCANNER_NEXT_NCHARS
#define SCANNER_NEXT_RETURN(_w,_n) \
do { weight_and_nchars_t rc= {_w, _n}; return rc; } while(0)
#define SCANNER_NEXT_RETURN_CONTRACTION(_cnt,_ignorable_nchars) \
do { \
weight_and_nchars_t rc= { _cnt->weight[0], \
_ignorable_nchars + \
my_contraction_char_length(_cnt) }; \
return rc; \
} while(0)
#else
#define SCANNER_NEXT_RETURN(_w,_n) do { return _w; } while (0)
#define SCANNER_NEXT_RETURN_CONTRACTION(_cnt,_ignorable_nchars) \
do { return _cnt->weight[0]; } while(0)
#endif
static inline
#ifdef SCANNER_NEXT_NCHARS
weight_and_nchars_t
MY_FUNCTION_NAME(scanner_next_with_nchars)(my_uca_scanner *scanner,
size_t nchars)
#else
int
MY_FUNCTION_NAME(scanner_next)(my_uca_scanner *scanner)
#endif
{
#ifdef SCANNER_NEXT_NCHARS
uint ignorable_nchars;
#define LOCAL_MAX_CONTRACTION_LENGTH nchars
#else
#define LOCAL_MAX_CONTRACTION_LENGTH MY_UCA_MAX_CONTRACTION
#endif
/*
Check if the weights for the previous character have been
already fully scanned. If yes, then get the next character and
initialize wbeg and wlength to its weight string.
*/
if (scanner->wbeg[0])
{
/*
More weights left from the previous step.
Return the next weight from the current expansion.
Return "0" as "nchars". The real nchars was set on a previous
iteration.
*/
SCANNER_NEXT_RETURN(*scanner->wbeg++, 0);
}
#ifdef SCANNER_NEXT_NCHARS
for (ignorable_nchars= 0 ; ; ignorable_nchars++)
#else
for ( ; ; )
#endif
{
const uint16 *wpage;
my_wc_t wc[MY_UCA_MAX_CONTRACTION];
int mblen;
/* Get next character */
#if MY_UCA_ASCII_OPTIMIZE
/* Get next ASCII character */
if (scanner->sbeg < scanner->send && scanner->sbeg[0] < 0x80)
{
wc[0]= scanner->sbeg[0];
scanner->sbeg+= 1;
#if MY_UCA_COMPILE_CONTRACTIONS
if (my_uca_needs_context_handling(scanner->level, wc[0]))
{
const MY_CONTRACTION *cnt= my_uca_context_weight_find(scanner, wc,
LOCAL_MAX_CONTRACTION_LENGTH);
if (cnt)
SCANNER_NEXT_RETURN_CONTRACTION(cnt, ignorable_nchars);
}
#endif
scanner->page= 0;
scanner->code= (int) wc[0];
scanner->wbeg= scanner->level->weights[0] + scanner->code * scanner->level->lengths[0];
if (scanner->wbeg[0])
SCANNER_NEXT_RETURN(*scanner->wbeg++, ignorable_nchars + 1);
continue;
}
else
#endif
/* Get next MB character */
if (((mblen= MY_MB_WC(scanner, wc, scanner->sbeg,
scanner->send)) <= 0))
{
if (scanner->sbeg >= scanner->send)
{
/* No more bytes, end of line reached */
SCANNER_NEXT_RETURN(-1, ignorable_nchars);
}
/*
There are some more bytes left. Non-positive mb_len means that
we got an incomplete or a bad byte sequence. Consume mbminlen bytes.
*/
if ((scanner->sbeg+= scanner->cs->mbminlen) > scanner->send)
{
/* For safety purposes don't go beyond the string range. */
scanner->sbeg= scanner->send;
}
/*
Treat every complete or incomplete mbminlen unit as a weight which is
greater than weight for any possible normal character.
0xFFFF is greater than any possible weight in the UCA weight table.
*/
SCANNER_NEXT_RETURN(0xFFFF, ignorable_nchars + 1);
}
scanner->sbeg+= mblen;
if (wc[0] > scanner->level->maxchar)
{
/* Return 0xFFFD as weight for all characters outside BMP */
scanner->wbeg= nochar;
SCANNER_NEXT_RETURN(0xFFFD, ignorable_nchars + 1);
}
#if MY_UCA_COMPILE_CONTRACTIONS
if (my_uca_needs_context_handling(scanner->level, wc[0]))
{
const MY_CONTRACTION *cnt= my_uca_context_weight_find(scanner, wc,
LOCAL_MAX_CONTRACTION_LENGTH);
if (cnt)
SCANNER_NEXT_RETURN_CONTRACTION(cnt, ignorable_nchars);
}
#endif
/* Process single character */
scanner->page= wc[0] >> 8;
scanner->code= wc[0] & 0xFF;
/* If weight page for w[0] does not exist, then calculate algoritmically */
if (!(wpage= scanner->level->weights[scanner->page]))
SCANNER_NEXT_RETURN(my_uca_scanner_next_implicit(scanner),
ignorable_nchars + 1);
/* Calculate pointer to w[0]'s weight, using page and offset */
scanner->wbeg= wpage +
scanner->code * scanner->level->lengths[scanner->page];
if (scanner->wbeg[0])
break;
/* Skip ignorable character and continue the loop */
}
SCANNER_NEXT_RETURN(*scanner->wbeg++, ignorable_nchars + 1);
}
#undef SCANNER_NEXT_NCHARS
#undef SCANNER_NEXT_RETURN
#undef SCANNER_NEXT_RETURN_CONTRACTION
#undef LOCAL_MAX_CONTRACTION_LENGTH
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