stage3/case_elements_check.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) 2015  Mario de Sousa (msousa@fe.up.pt)
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 *
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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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 * Case Options Checking:
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 *   - Check whether the options in a case statement are repeated, either directly, or in a range.
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 *       For example:
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 *         case var of
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 *           1: ...   <- OK
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 *           2: ...   <- OK
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 *           1: ...   <- OK (not an error), but produce a warning!
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 *           0..8: ...<- OK (not an error), but produce a warning!
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 */
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#include "../absyntax_utils/absyntax_utils.hh"
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class case_elements_check_c: public iterator_visitor_c {
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  private:
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    bool warning_found;
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    int error_count;
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    int current_display_error_level;
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    std::vector<symbol_c *> case_elements_list;
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    void check_subr_subr(symbol_c *s1, symbol_c *s2);
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    void check_subr_symb(symbol_c *s1, symbol_c *s2);
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    void check_symb_symb(symbol_c *s1, symbol_c *s2);
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  public:
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    case_elements_check_c(symbol_c *ignore);
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    virtual ~case_elements_check_c(void);
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    int get_error_count();
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    /***************************************/
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    /* B.3 - Language ST (Structured Text) */
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    /***************************************/
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    /********************/
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    /* B 3.2 Statements */
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    /********************/
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    /********************************/
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    /* B 3.2.3 Selection Statements */
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    /********************************/
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    void *visit(case_statement_c *symbol);
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    void *visit(case_list_c      *symbol);
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}; /* case_elements_check_c */
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