100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
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/*
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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, and variables for the position were
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introduced.
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We generate a C++ scanner since we want to use C++ ~ostream~ references instead of
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files for the input sequences.
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*/
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#ifndef NL_SCANNER_H
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#define NL_SCANNER_H
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#include "NestedList.h"
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#ifndef yyFlexLexer
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#define yyFlexLexer nlFlexLexer
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#include <FlexLexer.h>
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#endif
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#ifndef YY_CURRENT_BUFFER
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#define YY_CURRENT_BUFFER ( (yy_buffer_stack) \
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? (yy_buffer_stack)[(yy_buffer_stack_top)] \
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: NULL)
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#endif
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class NLScanner: public yyFlexLexer
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{
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public:
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enum Error
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{
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invalidInclude,
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circularInclusion,
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nestingTooDeep,
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cantRead,
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};
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NLScanner( NestedList* nestedList,
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std::istream* yyin = 0, std::ostream* yyout = 0 );
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int yylex(); // overruling yyFlexLexer's yylex()
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void DeleteCurrentBuffer(){
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#if YY_FLEX_MAJOR_VERSION >1 && \
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YY_FLEX_MINOR_VERSION > 4 && \
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YY_FLEX_SUBMINOR_VERSION > 32
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yy_delete_buffer(YY_CURRENT_BUFFER);
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#endif
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}
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void DeleteAllBuffers(){
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#if YY_FLEX_MAJOR_VERSION >1 && \
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YY_FLEX_MINOR_VERSION > 4 && \
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YY_FLEX_SUBMINOR_VERSION > 32
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while(YY_CURRENT_BUFFER){
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yy_delete_buffer(YY_CURRENT_BUFFER);
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}
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if(yy_buffer_stack){
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free(yy_buffer_stack);
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yy_buffer_stack=0;
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}
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#endif
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}
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private:
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// no Scanner copy-initialization
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NLScanner( NLScanner const &other );
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// no assignment either
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NLScanner &operator=( NLScanner const &other );
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NestedList* lexnl;
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};
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#endif
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