152 lines
3.4 KiB
C++
152 lines
3.4 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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December 2004, M. Spiekermann. A debug mode for the scanner and parser have been
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introduced. The error message will now help much better to locate errors.
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September 2006, M. Spiekermann. The Parser and Scanner have been revised in
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order to avoid that the generated bison file needs to be modified. The old
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version altered the generated code by sed scripts into a C++ class (which was
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incompatible with newer bison versions). Now we have still a class NLParser but
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it calls the external function ~yyparse~ provided by bison.
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*/
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#include "LogMsg.h"
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#include "NLScanner.h"
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#include "NLParser.h"
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#ifdef THREAD_SAFE
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#include <boost/thread.hpp>
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#endif
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using namespace std;
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extern CMsg cmsg;
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/*
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Below we declare some external variables for data exchange between class
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NLParser and the bison and flex generated code.
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*/
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NestedList* parseNL_nl = 0;
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extern ListExpr parseNL_list;
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extern int scanNL_lines;
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extern int scanNL_cols;
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extern string scanNL_str;
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extern int yydebug;
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extern int yyparse();
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#ifdef THREAD_SAFE
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static boost::recursive_mutex NLParserMtx;
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#endif
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/*
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Before we can call yyparse we need to construct a new scanner instance.
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*/
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static NLScanner* nlScanner = 0;
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int
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NLParser::parse()
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{
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#ifdef THREAD_SAFE
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boost::lock_guard<boost::recursive_mutex> guard(NLParserMtx);
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#endif
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if(nlScanner){
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nlScanner->DeleteAllBuffers();
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delete nlScanner;
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}
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nlScanner = new NLScanner( yaccnl, isp, osp );
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if ( RTFlag::isActive("NLParser:Debug") ) {
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yydebug = 1;
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} else {
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yydebug = 0;
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}
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if ( RTFlag::isActive("NLScanner:Debug") ) {
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nlScanner->set_debug(1);
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} else {
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nlScanner->set_debug(0);
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}
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scanNL_lines = 1;
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scanNL_cols = 0;
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scanNL_str = "";
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parseNL_nl = yaccnl;
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parseNL_list = yaccnl->Empty();
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int rc = yyparse();
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list = parseNL_list;
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nlScanner->DeleteAllBuffers();
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delete nlScanner;
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nlScanner = 0;
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return rc;
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}
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/*
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Providing function ~yyerror~
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*/
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void
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yyerror(const char* s )
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{
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#ifdef THREAD_SAFE
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boost::lock_guard<boost::recursive_mutex> guard(NLParserMtx);
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#endif
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cmsg.error()
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<< "Nested-List Parser: " << endl << " " << s
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<< " processing token ~" << nlScanner->YYText() << "~"
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//<< setiosflags(ios::hex|ios::showbase)
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//<< static_cast<unsigned short>( yychar )
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//<< resetiosflags(ios::hex|ios::showbase)
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<< " at line " << scanNL_lines
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<< " and col " << scanNL_cols << "!" << endl
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<< "LINE: " << scanNL_str << "$" << endl
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<< endl;
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cmsg.send();
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}
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/*
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Since function ~yylex()~ is a member function of class NLScanner we need to
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wrap the call into another function which has global scope.
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*/
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int
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yylex()
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{
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return nlScanner->yylex();
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}
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