absyntax_utils/get_var_name.hh
author Manuele Conti <conti.ma@alice.it>
Sun, 13 May 2012 17:57:15 +0200
changeset 557 95a2fe60a15c
parent 511 b22ae67d8003
child 889 5f380b99e95e
permissions -rw-r--r--
Add verify_is_lvalue to control_variable in for_statement.
511
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2012  Mario de Sousa (msousa@fe.up.pt)
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 *
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 *  This program 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 3 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program 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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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 *
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 * This code is made available on the understanding that it will not be
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 * used in safety-critical situations without a full and competent review.
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 */
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/*
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 * An IEC 61131-3 compiler.
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 *
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 * Based on the
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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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 *
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 */
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/*
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 *  A small helper visitor class, that will   
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 *  return the name (tokn_c *) of a variable, as it will
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 *  appear in the variable declaration.
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 */
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/*  For ex.:
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 *       VAR
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 *          A : int;
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 *          B : ARRAY [1..9] of int;
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 *          C : some_struct_t;
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 *       END_VAR
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 *
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 *          A    := 56;
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 *          B[8] := 99;
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 *          C.e  := 77;
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 *
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 *       Calling this visitor class with symbolic_variable_c instance referencing 'A' in
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 *       the line 'A := 56', will return the string "A".
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 *
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 *       Calling this visitor class with array_variable_c instance referencing 'B[8]' in
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 *       the line 'B[8] := 99', will return the string "B".
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 *
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 *       Calling this visitor class with array_variable_c instance referencing 'C.e' in
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 *       the line 'C.e := 77', will return the string "C".
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 */
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class get_var_name_c : public search_visitor_c {    
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  public:
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    get_var_name_c(void)  {};
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    ~get_var_name_c(void) {};  
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    static token_c *get_name(symbol_c *symbol);
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  private:
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    static get_var_name_c *singleton_instance_;
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  private:  
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    /*************************/
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    /* B.1 - Common elements */
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    /*************************/
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    /*******************************************/
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    /* B 1.1 - Letters, digits and identifiers */
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    /*******************************************/
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    // SYM_TOKEN(identifier_c)
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    void *visit(identifier_c *symbol);
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    /*********************/
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    /* B 1.4 - Variables */
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    /*********************/
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    // SYM_REF2(symbolic_variable_c, var_name, unused)
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    void *visit(symbolic_variable_c *symbol);
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    /********************************************/
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    /* B.1.4.1   Directly Represented Variables */
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    /********************************************/
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    // SYM_TOKEN(direct_variable_c)
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    // void *visit(direct_variable_c *symbol);
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    /*************************************/
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    /* B.1.4.2   Multi-element Variables */
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    /*************************************/
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    /*  subscripted_variable '[' subscript_list ']' */
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    // SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
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    void *visit(array_variable_c *symbol);
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    /* subscript_list ',' subscript */
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    // SYM_LIST(subscript_list_c)
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    // void *visit(subscript_list_c *symbol);
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    /*  record_variable '.' field_selector */
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    /*  WARNING: input and/or output variables of function blocks
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     *           may be accessed as fields of a tructured variable!
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     *           Code handling a structured_variable_c must take
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     *           this into account!
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     */
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    // SYM_REF2(structured_variable_c, record_variable, field_selector)
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    void *visit(structured_variable_c *symbol);
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};
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