absyntax_utils/decompose_var_instance_name.hh
author Edouard Tisserant <edouard.tisserant@gmail.com>
Fri, 26 Apr 2024 09:27:21 +0200
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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) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
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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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/* Decomposes a variable instance name into its constituents,
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 * example:
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 *    window.points[1].coordinate.x
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 *
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 *  will succesfully return
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 *        - window
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 *        - points
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 *        - coordinate
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 *        - x
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 * on succesive calls to decompose_var_instance_name_c::next_part()
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 */
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#include "../absyntax/visitor.hh"
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class decompose_var_instance_name_c: null_visitor_c {
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  public:
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    /***********************************/
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    /* B 1.2 - Operators               */
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    /***********************************/
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    static identifier_c     LD_operator_name;
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    static identifier_c     S_operator_name;
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    static identifier_c     R_operator_name;
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    static identifier_c     S1_operator_name;
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    static identifier_c     R1_operator_name;
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    static identifier_c     CLK_operator_name;
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    static identifier_c     CU_operator_name;
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    static identifier_c     CD_operator_name;
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    static identifier_c     PV_operator_name;
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    static identifier_c     IN_operator_name;
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    static identifier_c     PT_operator_name;
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  private:
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    symbol_c *variable_name;
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    symbol_c *next_variable_name;
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    symbol_c *current_recursive_variable_name;
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    symbol_c *previously_returned_variable_name;
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    list_c   *current_array_subscript_list;
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  public:
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    decompose_var_instance_name_c(symbol_c *variable_instance_name);
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    /* Get the next element in the strcutured variable */
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    symbol_c *get_next(void);
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    /* If the current element in the structured variable is an array, return its subscript_list, otherwise return NULL */
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    list_c *get_current_arraysubs_list(void);
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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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    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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    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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    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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  /*  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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    /* B 2.2 - Operators            */
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    /********************************/
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    void *visit(LD_operator_c *symbol);
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    void *visit(S_operator_c *symbol);
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    void *visit(R_operator_c *symbol);
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    void *visit(S1_operator_c *symbol);
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    void *visit(R1_operator_c *symbol);
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    void *visit(CLK_operator_c *symbol);
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    void *visit(CU_operator_c *symbol);
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    void *visit(CD_operator_c *symbol);
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    void *visit(PV_operator_c *symbol);
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    void *visit(IN_operator_c *symbol);
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    void *visit(PT_operator_c *symbol);
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181
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}; // decompose_var_instance_name_c
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