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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) 2009-2012  Mario de Sousa (msousa@fe.up.pt)

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 *  Copyright (C) 2012       Manuele Conti  (conti.ma@alice.it)

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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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#ifndef _HELPER_FUNCTIONS_HH_

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#define _HELPER_FUNCTIONS_HH_

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#include "../absyntax/visitor.hh"

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#include <typeinfo>

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typedef struct {

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  symbol_c *function_name;

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  symbol_c *nonformal_operand_list;

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  symbol_c *   formal_operand_list;

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  enum {POU_FB, POU_function} POU_type;

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//symbol_c &*datatype;

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//std::vector <symbol_c *> &candidate_datatypes;

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  std::vector <symbol_c *> &candidate_functions;

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  symbol_c *&called_function_declaration;

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  int      &extensible_param_count;

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} generic_function_call_t;

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/* A small helper class, to transform elementary data type to string.

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 * this allows us to generate more relevant error messages...

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 */

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class elementary_type_c: public null_visitor_c {

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  protected:

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    elementary_type_c(void)  {};

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    ~elementary_type_c(void) {};

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  private:

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    /* singleton class! */

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    static elementary_type_c *singleton;

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  public:

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    static const char * to_string(symbol_c *symbol);

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    /***********************************/

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    /* B 1.3.1 - Elementary Data Types */

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    /***********************************/

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    void *visit(time_type_name_c        *symbol) {return (void *)"TIME";        };

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    void *visit(bool_type_name_c        *symbol) {return (void *)"BOOL";        };

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    void *visit(sint_type_name_c        *symbol) {return (void *)"SINT";        };

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    void *visit(int_type_name_c         *symbol) {return (void *)"INT";         };

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    void *visit(dint_type_name_c        *symbol) {return (void *)"DINT";        };

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    void *visit(lint_type_name_c        *symbol) {return (void *)"LINT";        };

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    void *visit(usint_type_name_c       *symbol) {return (void *)"USINT";       };

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    void *visit(uint_type_name_c        *symbol) {return (void *)"UINT";        };

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    void *visit(udint_type_name_c       *symbol) {return (void *)"UDINT";       };

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    void *visit(ulint_type_name_c       *symbol) {return (void *)"ULINT";       };

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    void *visit(real_type_name_c        *symbol) {return (void *)"REAL";        };

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    void *visit(lreal_type_name_c       *symbol) {return (void *)"LREAL";       };

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    void *visit(date_type_name_c        *symbol) {return (void *)"DATE";        };

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    void *visit(tod_type_name_c         *symbol) {return (void *)"TOD";         };

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    void *visit(dt_type_name_c          *symbol) {return (void *)"DT";          };

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    void *visit(byte_type_name_c        *symbol) {return (void *)"BYTE";        };

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    void *visit(word_type_name_c        *symbol) {return (void *)"WORD";        };

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    void *visit(lword_type_name_c       *symbol) {return (void *)"LWORD";       };

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    void *visit(dword_type_name_c       *symbol) {return (void *)"DWORD";       };

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    void *visit(string_type_name_c      *symbol) {return (void *)"STRING";      };

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    void *visit(wstring_type_name_c     *symbol) {return (void *)"WSTRING";     };

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    void *visit(safetime_type_name_c    *symbol) {return (void *)"SAFETIME";    };

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    void *visit(safebool_type_name_c    *symbol) {return (void *)"SAFEBOOL";    };

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    void *visit(safesint_type_name_c    *symbol) {return (void *)"SAFESINT";    };

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    void *visit(safeint_type_name_c     *symbol) {return (void *)"SAFEINT";     };

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    void *visit(safedint_type_name_c    *symbol) {return (void *)"SAFEDINT";    };

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    void *visit(safelint_type_name_c    *symbol) {return (void *)"SAFELINT";    };

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    void *visit(safeusint_type_name_c   *symbol) {return (void *)"SAFEUSINT";   };

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    void *visit(safeuint_type_name_c    *symbol) {return (void *)"SAFEUINT";    };

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    void *visit(safeudint_type_name_c   *symbol) {return (void *)"SAFEUDINT";   };

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    void *visit(safeulint_type_name_c   *symbol) {return (void *)"SAFEULINT";   };

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    void *visit(safereal_type_name_c    *symbol) {return (void *)"SAFEREAL";    };

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    void *visit(safelreal_type_name_c   *symbol) {return (void *)"SAFELREAL";   };

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    void *visit(safedate_type_name_c    *symbol) {return (void *)"SAFEDATE";    };

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    void *visit(safetod_type_name_c     *symbol) {return (void *)"SAFETOD";     };

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    void *visit(safedt_type_name_c      *symbol) {return (void *)"SAFEDT";      };

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    void *visit(safebyte_type_name_c    *symbol) {return (void *)"SAFEBYTE";    };

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    void *visit(safeword_type_name_c    *symbol) {return (void *)"SAFEWORD";    };

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    void *visit(safelword_type_name_c   *symbol) {return (void *)"SAFELWORD";   };

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    void *visit(safedword_type_name_c   *symbol) {return (void *)"SAFEDWORD";   };

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    void *visit(safestring_type_name_c  *symbol) {return (void *)"SAFESTRING";  };

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    void *visit(safewstring_type_name_c *symbol) {return (void *)"SAFEWSTRING"; };

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};

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/* Widening Primitive Conversion */

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struct widen_entry {

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	symbol_c *left;

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	symbol_c *right;

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	symbol_c *result;

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	enum {ok, deprecated} status;

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};

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/*

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 * 2.5.1.5.6 Functions of time data types

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 * Table 30 - page 64

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 */

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extern const struct widen_entry widen_ADD_table[];

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extern const struct widen_entry widen_SUB_table[];

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extern const struct widen_entry widen_MUL_table[];

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extern const struct widen_entry widen_DIV_table[];

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extern const struct widen_entry widen_MOD_table[];

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extern const struct widen_entry widen_EXPT_table[];

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extern const struct widen_entry widen_AND_table[];

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extern const struct widen_entry widen_OR_table[];

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extern const struct widen_entry widen_XOR_table[];

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extern const struct widen_entry widen_CMP_table[];

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/* Search for a datatype inside a candidate_datatypes list.

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 * Returns: position of datatype in the list, or -1 if not found.

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 */

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int search_in_candidate_datatype_list(symbol_c *datatype, const std::vector <symbol_c *> &candidate_datatypes);

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/* Remove a datatype inside a candidate_datatypes list.

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 * Returns: If successful it returns true, false otherwise.

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 */

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bool remove_from_candidate_datatype_list(symbol_c *datatype, std::vector <symbol_c *> &candidate_datatypes);

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/* Intersect two candidate_datatype_lists.

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 * Remove from list1 (origin, dest.) all elements that are not found in list2 (with).

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 * In essence, list1 will contain the result of the intersection of list1 with list2.

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 * In other words, modify list1 so it only contains the elelements that are simultaneously in list1 and list2!

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 */

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void intersect_candidate_datatype_list(symbol_c *list1 /*origin, dest.*/, symbol_c *list2 /*with*/);

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/* intersect the candidate_datatype lists of all prev_il_intructions, and set the local candidate_datatype list to the result! */

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void intersect_prev_candidate_datatype_lists(il_instruction_c *symbol);

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bool is_type_equal(symbol_c *first_type, symbol_c *second_type);

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bool is_type_valid(symbol_c *type);

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#endif /* _HELPER_FUNCTIONS_HH_ */