vscan.cc

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/*
 * Copyright (C) 2008 Kamil Dudka <xdudka00@stud.fit.vutbr.cz>
 *
 * This file is part of rob08
 *
 * rob08 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * rob08 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with rob08.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"
#include "vscan.h"

#include "robIO.h"

#ifndef BUILDING_DOX
#   include <assert.h>
#   include <boost/regex.hpp>
#   include <FlexLexer.h>
#   include <map>
#   include <sstream>
#endif

using namespace StreamDecorator;
using std::string;

class VFlexLexer: public yyFlexLexer {
    public:
        VFlexLexer(std::istream &stream, string fileName):
            yyFlexLexer(&stream, &std::cerr),
            fileName_(fileName),
            hasError_(false)
        {
        }
        bool hasError() const {
            return hasError_;
        }
        EToken readNext() {
            return static_cast<EToken>
                (this->yylex());
        }
        void postError(const char *msg) {
            this->LexerError(msg);
        }
    protected:
        virtual void LexerOutput(const char *buf, int size) {
            string msg(buf, size);
            this->LexerError(msg.c_str());
        }
#if DEBUG_VSCAN
        virtual void LexerError(const char *msg) {
            this->hasError_ = true;
            std::ostream &str = *(this->yyout);
            str << Error(E_ERROR, fileName_, msg, lineno(), "lexical error")
                << std::endl;
        }
#else
        virtual void LexerError(const char *) { }
#endif
    private:
        string          fileName_;                      
        bool            hasError_;                      
};

class FlexVScan: public IVScan {
    public:
        FlexVScan(std::istream &stream, string fileName) {
            flex_ = new VFlexLexer(stream, fileName);
        }
        virtual ~FlexVScan() {
            delete flex_;
        }
        virtual bool readNext(string &);
        virtual bool hasError() const {
            return flex_->hasError();
        }
    private:
        VFlexLexer *flex_;                        
};

IVScan* VScanFactory::createVScan(std::istream &stream, std::string fileName) {
    return new FlexVScan(stream, fileName);
}

bool FlexVScan::readNext(string &data) {
readNext:
    if (!flex_->readNext())
        return false;

    std::string tmp(flex_->YYText());
    const boost::regex re("^#BEGIN#([^#]*)#END#$");
    boost::smatch result;
    if (!boost::regex_match(tmp, result, re)) {
        flex_->postError("FlexVScan::readnext, internal");
        goto readNext;
    }

    data = result[1];

#if DEBUG_VSCAN_OUTPUT
    std::cerr << Color(C_LIGHT_PURPLE) << "VScan" << Color(C_NO_COLOR) << " --> "
        << data << std::endl;
#endif

    return true;
}

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