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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