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/*
* Copyright (c) 2017, 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.
*/
/**
* \file
* \brief Parser for control verbs that can occur at the beginning of a pattern.
*/
#include "parser/control_verbs.h"
#include "parser/Parser.h"
#include "parser/parse_error.h"
#include <cstring>
#include <sstream>
using namespace std;
namespace ue2 {
const char *read_control_verbs(const char *ptr, const char *end, size_t start,
ParseMode &mode) {
const char *p = ptr;
const char *pe = end;
const char *eof = pe;
const char *ts, *te;
int cs;
UNUSED int act;
%%{
machine ControlVerbs;
# Verbs that we recognise but do not support.
unhandledVerbs = '(*' (
'LIMIT_MATCH=' [0-9]+ |
'LIMIT_RECURSION=' [0-9]+ |
'NO_AUTO_POSSESS' |
'NO_START_OPT' |
'UTF16' |
'UTF32' |
'CR' |
'LF' |
'CRLF' |
'ANYCRLF' |
'ANY' |
'BSR_ANYCRLF' |
'BSR_UNICODE'
) . ')';
main := |*
'(*UTF8)' | '(*UTF)' => {
mode.utf8 = true;
};
'(*UCP)' => {
mode.ucp = true;
};
unhandledVerbs => {
ostringstream str;
str << "Unsupported control verb " << string(ts, te - ts);
throw LocatedParseError(str.str());
};
'(*' [^)]+ ')' => {
ostringstream str;
str << "Unknown control verb " << string(ts, te - ts);
throw LocatedParseError(str.str());
};
# Anything else means we're done.
any => {
fhold;
fbreak;
};
*|;
write data;
write init;
}%%
try {
%% write exec;
} catch (LocatedParseError &error) {
if (ts >= ptr && ts <= pe) {
error.locate(ts - ptr + start);
} else {
error.locate(0);
}
throw;
}
return p;
}
} // namespace ue2
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