ossp-pkg/l2/l2_spec_scan.l
%{
/*
** OSSP l2 - Flexible Logging
** Copyright (c) 2001-2005 Cable & Wireless <http://www.cw.com/>
** Copyright (c) 2001-2005 The OSSP Project <http://www.ossp.org/>
** Copyright (c) 2001-2005 Ralf S. Engelschall <rse@engelschall.com>
**
** This file is part of OSSP l2, a flexible logging library which
** can be found at http://www.ossp.org/pkg/lib/l2/.
**
** Permission to use, copy, modify, and distribute this software for
** any purpose with or without fee is hereby granted, provided that
** the above copyright notice and this permission notice appear in all
** copies.
**
** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
** USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
** OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE.
**
** l2_spec_scan.l: GNU Flex (Lex-style) scanner specification
**
** ATTENTION: This requires GNU Flex 2.5.10 or newer!
*/
#include "l2.h" /* for l2_xxx() */
#include "l2_spec.h" /* for l2_spec_ctx_t */
#include "l2_spec_parse.h" /* for T_XXXX */
/* how to find our own context */
#define CTX ((l2_spec_ctx_t *)yyget_extra(yyscanner))
/* provide own input handling */
#define YY_NO_UNPUT 1
#undef YY_INPUT
#define YY_INPUT(buf,result,max_size) (result = yyinput(CTX, buf, max_size))
static int yyinput(l2_spec_ctx_t *ctx, char *buf, int max_size);
/* location tracking */
#define YY_USER_INIT \
yylloc->first = 0; \
yylloc->last = 0;
#define YY_USER_ACTION \
yylloc->first = yylloc->last; \
yylloc->last += yyleng;
#define YY_USER_ACTION_ROLLBACK \
yylloc->last = yylloc->first
%}
/* scanner options */
%pointer
%option stack
%option reentrant
%option bison-bridge
%option bison-locations
%option never-interactive
%option noyywrap
%option nounput
%option noyy_top_state
%option nounistd
/* scanner states */
%x SS_PARAM
%x SS_PARAM_Q
%%
/* local variables */
char caParam[2048];
char *cpParam = NULL;
/* parameter value */
<SS_PARAM>\" {
if (cpParam == NULL)
cpParam = caParam;
BEGIN(SS_PARAM_Q);
}
<SS_PARAM>\\. {
if (cpParam == NULL)
cpParam = caParam;
*cpParam++ = yytext[1];
}
<SS_PARAM>[^ \t\r\n\\,)"]+ {
char *cp = yytext;
if (cpParam == NULL)
cpParam = caParam;
while (*cp != '\0')
*cpParam++ = *cp++;
}
<SS_PARAM>(.|\n) {
if (cpParam == NULL)
cpParam = caParam;
*cpParam = '\0';
yylval->cpValue = strdup(caParam);
cpParam = NULL;
yyless(0);
YY_USER_ACTION_ROLLBACK;
return T_PARAM;
}
<SS_PARAM_Q>\" {
BEGIN(SS_PARAM);
}
<SS_PARAM_Q>\n {
l2_spec_error(CTX, L2_ERR_SYN, yylloc, "Unterminated string");
return 0;
}
<SS_PARAM_Q>\\[0-7]{1,3} {
unsigned int result;
(void)sscanf(yytext+1, "%o", &result);
if (result > 0xff) {
l2_spec_error(CTX, L2_ERR_SYN, yylloc, "Escape sequence out of bound");
return 0;
}
else
*cpParam++ = result;
}
<SS_PARAM_Q>\\x[0-9a-fA-F]{2} {
unsigned int result;
(void)sscanf(yytext+1, "%x", &result);
if (result > 0xff) {
l2_spec_error(CTX, L2_ERR_SYN, yylloc, "Escape sequence out of bound");
return 0;
}
else
*cpParam++ = result;
}
<SS_PARAM_Q>\\n { *cpParam++ = '\n'; }
<SS_PARAM_Q>\\r { *cpParam++ = '\r'; }
<SS_PARAM_Q>\\t { *cpParam++ = '\t'; }
<SS_PARAM_Q>\\b { *cpParam++ = '\b'; }
<SS_PARAM_Q>\\f { *cpParam++ = '\f'; }
<SS_PARAM_Q>\\(.|\n) {
*cpParam++ = yytext[1];
}
<SS_PARAM_Q>[^\\\"]+ {
char *cp = yytext;
while (*cp != '\0')
*cpParam++ = *cp++;
}
<SS_PARAM_Q>(.|\n) {
*cpParam++ = yytext[0];
}
/* whitespaces */
[ \t\n]+ {
/* NOOP */
}
/* operators */
"->" {
return T_OP_ARROW;
}
/* identifiers */
[a-zA-Z][a-zA-Z0-9_-]* {
yylval->cpValue = strdup(yytext);
return T_ID;
}
/* anything else is returned as is... */
.|\n {
return yytext[0];
}
%%
/* external scanner state transitions */
void l2_spec_scan_push(l2_spec_ctx_t *ctx, const char *state);
void l2_spec_scan_push(l2_spec_ctx_t *ctx, const char *state)
{
if (strcmp(state, "SS_PARAM") == 0)
yy_push_state(SS_PARAM, ctx->yyscan);
}
void l2_spec_scan_pop(l2_spec_ctx_t *ctx);
void l2_spec_scan_pop(l2_spec_ctx_t *ctx)
{
yy_pop_state(ctx->yyscan);
}
/* buffer-based input routine */
static int yyinput(l2_spec_ctx_t *ctx, char *buf, int max_size)
{
int n;
n = (ctx->inputbuf + ctx->inputlen - ctx->inputptr);
if (n > max_size)
n = max_size;
if (n <= 0)
return YY_NULL;
memcpy(buf, ctx->inputptr, n);
ctx->inputptr += n;
return n;
}
