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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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/*

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 * This file contains the code that calls the stage 1 (lexical anayser) 

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 * and stage 2 (syntax parser) during the first pass.

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 */

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#include <string.h>

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#include <stdlib.h>

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/* file with declaration of absyntax classes... */

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

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#include "stage1_2.hh"

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#include "iec_bison.hh"

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#include "stage1_2_priv.hh"

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#include "create_enumtype_conversion_functions.hh"

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static stage1_2_options_t options_;

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

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/* whether we are supporting safe extensions          */

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/* as defined in PLCopen - Technical Committee 5      */

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/* Safety Software Technical Specification,           */

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/* Part 1: Concepts and Function Blocks,              */

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/* Version 1.0 – Official Release                   */

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

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bool get_opt_safe_extensions() {return options_.safe_extensions;}

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

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/* whether to allow nested comments */

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

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bool get_opt_nested_comments() {return options_.nested_comments;}

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

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/* whether to allow REF(), DREF(), REF_TO, NULL and ^ operators/keywords  */

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

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bool get_opt_ref_standard_extensions() {return options_.ref_standard_extensions;}

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

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/* Controlling the entry to the body_state in flex. */

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

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static int goto_body_state__ = 0;

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void cmd_goto_body_state(void) {goto_body_state__ = 1;}

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int  get_goto_body_state(void) {return goto_body_state__;}

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void rst_goto_body_state(void) {goto_body_state__ = 0;}

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

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/* Controlling the entry to the sfc_qualifier_state in flex. */

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

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static int goto_sfc_qualifier_state__ = 0;

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void cmd_goto_sfc_qualifier_state(void) {goto_sfc_qualifier_state__ = 1;}

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int  get_goto_sfc_qualifier_state(void) {return goto_sfc_qualifier_state__;}

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void rst_goto_sfc_qualifier_state(void) {goto_sfc_qualifier_state__ = 0;}

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

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/* Controlling the entry to the sfc_priority_state in flex.  */

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

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static int goto_sfc_priority_state__ = 0;

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void cmd_goto_sfc_priority_state(void) {goto_sfc_priority_state__ = 1;}

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int  get_goto_sfc_priority_state(void) {return goto_sfc_priority_state__;}

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void rst_goto_sfc_priority_state(void) {goto_sfc_priority_state__ = 0;}

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

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/* Controlling the entry to the sfc_qualifier_state in flex. */

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

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static int goto_task_init_state__ = 0;

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void cmd_goto_task_init_state(void) {goto_task_init_state__ = 1;}

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int  get_goto_task_init_state(void) {return goto_task_init_state__;}

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void rst_goto_task_init_state(void) {goto_task_init_state__ = 0;}

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

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/* Returning to state in flex previously pushed onto the stack. */

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

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static int pop_state__ = 0;

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void cmd_pop_state(void) {pop_state__ = 1;}

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int  get_pop_state(void) {return pop_state__;}

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void rst_pop_state(void) {pop_state__ = 0;}

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

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/* The global symbol tables...   */

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

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/* NOTE: only accessed indirectly by the lexical parser (flex)

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 *       through the function get_identifier_token()

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 */

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/* NOTE: BOGUS_TOKEN_ID is defined in the bison generated file iec_bison.hh.

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 *       We need this constant defined before we can declare the symbol tables.

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 *       However, we cannot #include "iec_bison.hh" in this file (stage1_2_priv.hh) directly

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 *       because of the way bison ver. 3.2 is copying all declarations in the prologue

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 *       of iec.y to the iec_bison.hh file (including an #include stage1_2_priv.hh).

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 *       So, if we were to include "iec_bison.hh" here, we would get a circular include.

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 *       All this means that whoever includes this file (stage1_2_priv.hh) will need

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 *       to take care to first inlcude iec_bison.hh !!

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 */ 

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/* A symbol table to store all the library elements */

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/* e.g.: <function_name , function_decl>

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 *       <fb_name , fb_decl>

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 *       <type_name , type_decl>

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 *       <program_name , program_decl>

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 *       <configuration_name , configuration_decl>

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 */

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/* static */ symtable_c<int, BOGUS_TOKEN_ID> library_element_symtable;

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/* A symbol table to store the declared variables of

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 * the function currently being parsed...

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 */

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/* static */ symtable_c<int, BOGUS_TOKEN_ID> variable_name_symtable;

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/* A symbol table to store the declared direct variables of

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 * the function currently being parsed...

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 */

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/* static */ symtable_c<int, BOGUS_TOKEN_ID> direct_variable_symtable;

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/* Function only called from within flex!

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 *

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 * search for a symbol in either of the two symbol tables

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 * declared above, and return the token id of the first

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 * symbol found.

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 * Searches first in the variables, and only if not found

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 * does it continue searching in the library elements

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 */

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int get_identifier_token(const char *identifier_str) {

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//  std::cout << "get_identifier_token(" << identifier_str << "): \n";

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  int token_id;

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  if ((token_id = variable_name_symtable.find_value(identifier_str)) == variable_name_symtable.end_value())

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    if ((token_id = library_element_symtable.find_value(identifier_str)) == library_element_symtable.end_value())

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      return identifier_token;

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  return token_id;

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}

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/* Function only called from within flex!

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 *

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 * search for a symbol in direct variables symbol table

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 * declared above, and return the token id of the first

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 * symbol found.

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 */

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int get_direct_variable_token(const char *direct_variable_str) {

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  int token_id;

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  if ((token_id = direct_variable_symtable.find_value(direct_variable_str)) == direct_variable_symtable.end_value())

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    return direct_variable_token;

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  return token_id;

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}

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

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/* Utility Functions... */

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

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/*

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 * Join two strings together. Allocate space with malloc(3).

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 */

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char *strdup2(const char *a, const char *b) {

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  char *res = (char *)malloc(strlen(a) + strlen(b) + 1);

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  if (!res)

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    return NULL;

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  return strcat(strcpy(res, a), b);  /* safe, actually */

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}

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/*

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 * Join three strings together. Allocate space with malloc(3).

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 */

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char *strdup3(const char *a, const char *b, const char *c) {

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  char *res = (char *)malloc(strlen(a) + strlen(b) + strlen(c) + 1);

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  if (!res)

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    return NULL;

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  return strcat(strcat(strcpy(res, a), b), c);  /* safe, actually */

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}

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

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

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

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

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

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

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

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

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

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

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int stage2__(const char *filename, 

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             symbol_c **tree_root_ref,

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             stage1_2_options_t options

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            );

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int stage1_2(const char *filename, symbol_c **tree_root_ref, stage1_2_options_t options) {

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      /* NOTE: we only call stage2 (bison - syntax analysis) directly, as stage 2 will itself call stage1 (flex - lexical analysis)

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       *       automatically as needed

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       */

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      /* NOTE: Since we do not call stage1__ (flex) directly, we cannot directly pass any parameters to that function either.

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       *       In this case, we use callback functions, i.e. stage1__ (i.e. flex) will call functions defined in this file

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       *       whenever it needs info/parameters coming from stage1_2().

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       *       These callback functions will get their data from local (to this file) global variables...

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       *       We now set those variables...

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       */

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  options_ = options;

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  return stage2__(filename, tree_root_ref, options);

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}

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