FreeCAD

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/***************************************************************************
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 *   Copyright (c) 2010 Jürgen Riegel <juergen.riegel@web.de>              *
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 *                                                                         *
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 *   This library is free software; you can redistribute it and/or         *
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 *   modify it under the terms of the GNU Library General Public           *
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 *   License as published by the Free Software Foundation; either          *
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 *   version 2 of the License, or (at your option) any later version.      *
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 *                                                                         *
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 *   This library  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 Library General Public License for more details.                  *
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 *                                                                         *
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 *   You should have received a copy of the GNU Library General Public     *
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 *   License along with this library; see the file COPYING.LIB. If not,    *
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 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
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 *   Suite 330, Boston, MA  02111-1307, USA                                *
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 *                                                                         *
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 ***************************************************************************/
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/* Parser for the FreeCAD selection filter language */
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/*  bison -o SelectionFilter.tab.c  SelectionFilter.y  */
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/* Represents the many different ways we can access our data */
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%union {
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    std::string *string;
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    Node_Object *object;
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    Node_Slice  *slice;
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    Node_Block  *block;
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    int          token;
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    int          number;
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}
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/* Define our terminal symbols (tokens). This should
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   match our tokens.l lex file. We also define the node type
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   they represent.
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 */
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%token <string> TIDENTIFIER
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%token <token> TSUB TSELECT TCOUNT TSLICE TNAMESPACE
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%token <number> TNUMBER
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/* Define the type of node our nonterminal symbols represent.
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   The types refer to the %union declaration above.
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 */
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%type <slice> count
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%type <object> matchline
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%type <string> type subname
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%type <block>  matchlines block
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%start filter
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%%
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type  : TSELECT TIDENTIFIER							{ $$ = $2; }
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       | TSELECT TIDENTIFIER TNAMESPACE TIDENTIFIER { $$ = StringFactory::New(*$2 + "::" + *$4); }
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subname :								 { $$ = 0;  }
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         | TSUB TIDENTIFIER				 { $$ = $2; }
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count :									 { $$ = 0;                     }
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      | TCOUNT TNUMBER TSLICE TNUMBER    { $$ = new Node_Slice($2,$4); }
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      | TCOUNT TNUMBER TSLICE            { $$ = new Node_Slice($2);    }
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      | TCOUNT TNUMBER                   { $$ = new Node_Slice($2,$2); }
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matchline  : type subname count                { $$ = new Node_Object($1,$2,$3); }
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matchlines : matchline            { $$ = new Node_Block($1);  }
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           | matchlines matchline { $$ = $1 ; $$->Objects.emplace_back($2); }
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block : matchlines                { $$ = $1; }
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filter:   block					  { TopBlock = $1; }
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;
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%%
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