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/*
* Copyright (c) 2015, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS 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 COPYRIGHT OWNER OR 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.
*/
#include "config.h"
#include "ExpressionParser.h"
#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include "ue2common.h"
#include "hs_compile.h"
using std::string;
namespace { // anon
enum ParamKey {
PARAM_NONE,
PARAM_MIN_OFFSET,
PARAM_MAX_OFFSET,
PARAM_MIN_LENGTH
};
%%{
machine ExpressionParser;
action accumulateNum {
num = (num * 10) + (fc - '0');
}
action handleFlag {
switch (fc) {
case 'i': *flags |= HS_FLAG_CASELESS; break;
case 's': *flags |= HS_FLAG_DOTALL; break;
case 'm': *flags |= HS_FLAG_MULTILINE; break;
case 'H': *flags |= HS_FLAG_SINGLEMATCH; break;
case 'O':
if (must_be_ordered) {
*must_be_ordered = true;
}
break;
case 'V': *flags |= HS_FLAG_ALLOWEMPTY; break;
case 'W': *flags |= HS_FLAG_UCP; break;
case '8': *flags |= HS_FLAG_UTF8; break;
case 'P': *flags |= HS_FLAG_PREFILTER; break;
case 'L': *flags |= HS_FLAG_SOM_LEFTMOST; break;
default: fbreak;
}
}
action handleExtParam {
switch (key) {
case PARAM_MIN_OFFSET:
ext->flags |= HS_EXT_FLAG_MIN_OFFSET;
ext->min_offset = num;
break;
case PARAM_MAX_OFFSET:
ext->flags |= HS_EXT_FLAG_MAX_OFFSET;
ext->max_offset = num;
break;
case PARAM_MIN_LENGTH:
ext->flags |= HS_EXT_FLAG_MIN_LENGTH;
ext->min_length = num;
break;
case PARAM_NONE:
default:
// No key specified, syntax invalid.
return false;
}
}
write data;
}%%
} // namespace
static
void initExt(hs_expr_ext *ext) {
memset(ext, 0, sizeof(*ext));
ext->max_offset = MAX_OFFSET;
}
bool readExpression(const std::string &input, std::string &expr,
unsigned int *flags, hs_expr_ext *ext,
bool *must_be_ordered) {
assert(flags);
assert(ext);
// Init flags and ext params.
*flags = 0;
initExt(ext);
if (must_be_ordered) {
*must_be_ordered = false;
}
// Extract expr, which is easier to do in straight C++ than with Ragel.
if (input.empty() || input[0] != '/') {
return false;
}
size_t end = input.find_last_of('/');
if (end == string::npos || end == 0) {
return false;
}
expr = input.substr(1, end - 1);
// Use a Ragel scanner to handle flags and params.
const char *p = input.c_str() + end + 1;
const char *pe = input.c_str() + input.size();
UNUSED const char *eof = pe;
UNUSED const char *ts = p, *te = p;
int cs;
UNUSED int act;
assert(p);
assert(pe);
// For storing integers as they're scanned.
u64a num = 0;
enum ParamKey key = PARAM_NONE;
%%{
single_flag = [ismW8HPLVO];
param = ('min_offset' @{ key = PARAM_MIN_OFFSET; } |
'max_offset' @{ key = PARAM_MAX_OFFSET; } |
'min_length' @{ key = PARAM_MIN_LENGTH; } );
value = (digit @accumulateNum)+ >{num = 0;};
param_spec = (' '* param '=' value ' '*) >{ key = PARAM_NONE; }
%handleExtParam;
main := ( single_flag @handleFlag )* # single-char flags
( '{' param_spec (',' param_spec)* '}' )? # list of ext params
$^{ return false; };
# Intialize and execute.
write init;
write exec;
}%%
DEBUG_PRINTF("expr='%s', flags=%u\n", expr.c_str(), *flags);
return (cs != ExpressionParser_error) && (p == pe);
}
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