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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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typedef struct

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{

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  identifier_c *symbol;

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} VARIABLE;

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

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

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

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

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class generate_c_sfcdecl_c: protected generate_c_base_c {

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  public:

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      typedef enum {

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        sfcdecl_sd,

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        sfcinit_sd,

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        stepcount_sd,

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        stepdef_sd,

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        stepundef_sd,

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        actiondef_sd,

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        actionundef_sd,

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        actioncount_sd,

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        transitioncount_sd

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       } sfcdeclaration_t;

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  private:

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    int step_number;

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    int action_number;

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    int transition_number;

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    std::list<VARIABLE> variable_list;

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    sfcdeclaration_t wanted_sfcdeclaration;

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    search_var_instance_decl_c *search_var_instance_decl;

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  public:

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    generate_c_sfcdecl_c(stage4out_c *s4o_ptr, symbol_c *scope, const char *variable_prefix = NULL)

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    : generate_c_base_c(s4o_ptr) {

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      this->set_variable_prefix(variable_prefix);

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      search_var_instance_decl = new search_var_instance_decl_c(scope);

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    }

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    ~generate_c_sfcdecl_c(void) {

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      variable_list.clear();

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      delete search_var_instance_decl;

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    }

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    void generate(symbol_c *symbol, sfcdeclaration_t declaration_type) {

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      wanted_sfcdeclaration = declaration_type;

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      symbol->accept(*this);

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    }

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

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/* B.1.6  Sequential function chart elements */

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

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    void *visit(sequential_function_chart_c *symbol) {

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      step_number = 0;

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      action_number = 0;

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      transition_number = 0;

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      switch (wanted_sfcdeclaration) {

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        case sfcdecl_sd:

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          for(int i = 0; i < symbol->n; i++)

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            symbol->elements[i]->accept(*this);

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          /* steps table declaration */

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          s4o.print(s4o.indent_spaces + "STEP __step_list[");

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          s4o.print(step_number);

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          s4o.print("];\n");

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          s4o.print(s4o.indent_spaces + "UINT __nb_steps;\n");

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          /* actions table declaration */

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          s4o.print(s4o.indent_spaces + "ACTION __action_list[");

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          s4o.print(action_number);

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          s4o.print("];\n");

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          s4o.print(s4o.indent_spaces + "UINT __nb_actions;\n");

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          /* transitions table declaration */

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          s4o.print(s4o.indent_spaces + "__IEC_BOOL_t __transition_list[");

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          s4o.print(transition_number);

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          s4o.print("];\n");

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          /* transitions debug table declaration */

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          s4o.print(s4o.indent_spaces + "__IEC_BOOL_t __debug_transition_list[");

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          s4o.print(transition_number);

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          s4o.print("];\n");

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          s4o.print(s4o.indent_spaces + "UINT __nb_transitions;\n");

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          /* last_ticktime declaration */

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          s4o.print(s4o.indent_spaces + "TIME __lasttick_time;\n");

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          break;

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        case sfcinit_sd:

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          s4o.print(s4o.indent_spaces);

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          s4o.print("UINT i;\n");

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          /* steps table count */

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          wanted_sfcdeclaration = stepcount_sd;

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          for(int i = 0; i < symbol->n; i++)

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            symbol->elements[i]->accept(*this);

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          s4o.print(s4o.indent_spaces);

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          print_variable_prefix();

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          s4o.print("__nb_steps = ");

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          s4o.print(step_number);

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          s4o.print(";\n");

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          step_number = 0;

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          wanted_sfcdeclaration = sfcinit_sd;

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          /* steps table initialisation */

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          s4o.print(s4o.indent_spaces + "static const STEP temp_step = {{0, 0}, 0, {0, 0}};\n");

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          s4o.print(s4o.indent_spaces + "for(i = 0; i < ");

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          print_variable_prefix();

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          s4o.print("__nb_steps; i++) {\n");

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          s4o.indent_right();

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          s4o.print(s4o.indent_spaces);

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          print_variable_prefix();

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          s4o.print("__step_list[i] = temp_step;\n");

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          s4o.indent_left();

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          s4o.print(s4o.indent_spaces + "}\n");

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          for(int i = 0; i < symbol->n; i++)

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            symbol->elements[i]->accept(*this);

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          /* actions table count */

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          wanted_sfcdeclaration = actioncount_sd;

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          for(int i = 0; i < symbol->n; i++)

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            symbol->elements[i]->accept(*this);

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          s4o.print(s4o.indent_spaces);

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          print_variable_prefix();

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          s4o.print("__nb_actions = ");

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          s4o.print(action_number);

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          s4o.print(";\n");

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          action_number = 0;

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          wanted_sfcdeclaration = sfcinit_sd;

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          /* actions table initialisation */

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          s4o.print(s4o.indent_spaces + "static const ACTION temp_action = {0, {0, 0}, 0, 0, {0, 0}, {0, 0}};\n");

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          s4o.print(s4o.indent_spaces + "for(i = 0; i < ");

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          print_variable_prefix();

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          s4o.print("__nb_actions; i++) {\n");

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          s4o.indent_right();

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          s4o.print(s4o.indent_spaces);

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          print_variable_prefix();

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          s4o.print("__action_list[i] = temp_action;\n");

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          s4o.indent_left();

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          s4o.print(s4o.indent_spaces + "}\n");

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          /* transitions table count */

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          wanted_sfcdeclaration = transitioncount_sd;

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          for(int i = 0; i < symbol->n; i++)

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            symbol->elements[i]->accept(*this);

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          s4o.print(s4o.indent_spaces);

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          print_variable_prefix();

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          s4o.print("__nb_transitions = ");

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          s4o.print(transition_number);

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          s4o.print(";\n");

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          transition_number = 0;

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          wanted_sfcdeclaration = sfcinit_sd;

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          /* last_ticktime initialisation */

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          s4o.print(s4o.indent_spaces);

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          print_variable_prefix();

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          s4o.print("__lasttick_time = __CURRENT_TIME;\n");

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          break;

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        case stepdef_sd:

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          s4o.print("// Steps definitions\n");

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          for(int i = 0; i < symbol->n; i++)

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            symbol->elements[i]->accept(*this);

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          s4o.print("\n");

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          break;

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        case actiondef_sd:

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          s4o.print("// Actions definitions\n");

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          for(int i = 0; i < symbol->n; i++)

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             symbol->elements[i]->accept(*this);

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          {

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            std::list<VARIABLE>::iterator pt;

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            for(pt = variable_list.begin(); pt != variable_list.end(); pt++) {

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              s4o.print("#define ");

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              s4o.print(SFC_STEP_ACTION_PREFIX);

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              pt->symbol->accept(*this);

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              s4o.print(" ");

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              s4o.print(action_number);

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              s4o.print("\n");

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              action_number++;

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            }

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          }

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          s4o.print("\n");

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          break;

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        case stepundef_sd:

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          s4o.print("// Steps undefinitions\n");

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          for(int i = 0; i < symbol->n; i++)

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            symbol->elements[i]->accept(*this);

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          s4o.print("\n");

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          break;

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        case actionundef_sd:

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          s4o.print("// Actions undefinitions\n");

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          {

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            std::list<VARIABLE>::iterator pt;

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            for(pt = variable_list.begin(); pt != variable_list.end(); pt++) {

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              s4o.print("#undef ");

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              s4o.print(SFC_STEP_ACTION_PREFIX);

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              pt->symbol->accept(*this);

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              s4o.print("\n");

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            }

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          }

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          for(int i = 0; i < symbol->n; i++)

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            symbol->elements[i]->accept(*this);

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          s4o.print("\n");

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          break;

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        default:

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          break;

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      }

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      return NULL;

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    }

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    void *visit(initial_step_c *symbol) {

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      switch (wanted_sfcdeclaration) {

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        case actioncount_sd:

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          symbol->action_association_list->accept(*this);

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          break;

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        case sfcdecl_sd:

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          symbol->action_association_list->accept(*this);

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        case stepcount_sd:

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          step_number++;

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          break;

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        case sfcinit_sd:

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          s4o.print(s4o.indent_spaces);

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          s4o.print(SET_VAR);

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          s4o.print("(");

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          print_variable_prefix();

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          s4o.print(",__step_list[");

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          s4o.print(step_number);

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          step_number++;

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          break;

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        case stepdef_sd:

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          s4o.print("#define ");

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          s4o.print(SFC_STEP_ACTION_PREFIX);

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          symbol->step_name->accept(*this);

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          s4o.print(" ");

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          s4o.print(step_number);

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          s4o.print("\n");

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          step_number++;

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          break;

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        case stepundef_sd:

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          s4o.print("#undef ");

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          s4o.print(SFC_STEP_ACTION_PREFIX);

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          symbol->step_name->accept(*this);

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          s4o.print("\n");

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          break;

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        default:

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          break;

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      }

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      return NULL;

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    }

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    void *visit(step_c *symbol) {

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      switch (wanted_sfcdeclaration) {

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        case actioncount_sd:

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          symbol->action_association_list->accept(*this);

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          break;

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        case sfcdecl_sd:

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          symbol->action_association_list->accept(*this);

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        case stepcount_sd:

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        case sfcinit_sd:

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          step_number++;

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          break;

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        case stepdef_sd:

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          s4o.print("#define ");

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          s4o.print(SFC_STEP_ACTION_PREFIX);

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          symbol->step_name->accept(*this);

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          s4o.print(" ");

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          s4o.print(step_number);

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          s4o.print("\n");

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          step_number++;

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          break;

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        case stepundef_sd:

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          s4o.print("#undef ");

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          s4o.print(SFC_STEP_ACTION_PREFIX);

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          symbol->step_name->accept(*this);

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          s4o.print("\n");

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          break;

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        default:

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          break;

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      }

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      return NULL;

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    }

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    void *visit(action_association_c *symbol) {

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      /* we try to find the variable instance declaration, to determine if symbol is variable... */

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      symbol_c *var_decl = search_var_instance_decl->get_decl(symbol->action_name);

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      if (var_decl != NULL) {

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    	std::list<VARIABLE>::iterator pt;

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        for(pt = variable_list.begin(); pt != variable_list.end(); pt++) {

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          if (!compare_identifiers(pt->symbol, symbol->action_name))

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            return NULL;

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        }

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        VARIABLE *variable;

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        variable = new VARIABLE;

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        variable->symbol = (identifier_c*)(symbol->action_name);

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        variable_list.push_back(*variable);

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        action_number++;

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      }

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      return NULL;

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    }

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    void *visit(transition_c *symbol) {

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      switch (wanted_sfcdeclaration) {

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        case sfcdecl_sd:

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        case transitioncount_sd:

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          transition_number++;

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          break;

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        default:

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          break;

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      }

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      return NULL;

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    }

   361

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    void *visit(action_c *symbol) {

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      switch (wanted_sfcdeclaration) {

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        case actiondef_sd:

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          s4o.print("#define ");

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          s4o.print(SFC_STEP_ACTION_PREFIX);

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          symbol->action_name->accept(*this);

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          s4o.print(" ");

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          s4o.print(action_number);

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          s4o.print("\n");

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          action_number++;

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          break;

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        case actionundef_sd:

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          s4o.print("#undef ");

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          s4o.print(SFC_STEP_ACTION_PREFIX);

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          symbol->action_name->accept(*this);

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          s4o.print("\n");

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          break;

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        case actioncount_sd:

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        case sfcdecl_sd:

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          action_number++;

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          break;

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        default:

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          break;

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      }

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      return NULL;

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    }

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    void *visit(instruction_list_c *symbol) {

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      return NULL;

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    }

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   393

    void *visit(statement_list_c *symbol) {

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      return NULL;

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    }

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}; /* generate_c_sfcdecl_c */

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