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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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/* Search in a VAR* END_VAR declaration for the delcration of the specified variable instance. 

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 * Will return:

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 *     - the declaration itself (get_decl() )

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 *     - the type of declaration in which the variable was declared (get_vartype() )

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 *

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 * The variable instance may NOT be a member of a structure of a memeber

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 * of a structure of an element of an array of ...

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 *

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 * For example, considering the following 'variables':

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 *    window.points[1].coordinate.x

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 *    window.points[1].colour

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 *    offset[99]

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 *

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 *   passing a reference to 'points', 'points[1]', 'points[1].colour', 'colour'

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 *    ARE NOT ALLOWED!

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 *

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 * This class must only be passed the name of the variable that will appear

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 * in the variable declaration. In the above examples, this would be

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 *   'window.points[1].coordinate.x'

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 *   'window.points[1].coordinate'

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 *   'window.points[1]'

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 *   'window'

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 *   'window.points[1].colour'

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 *   'offset'

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 *   'offset[99]'

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 *

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 *

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 */

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/* Note: 

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 * Determining the declaration type of a specific variable instance (including

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 * function block instances) really means determining whether the variable was declared in a

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 *  VAR_INPUT

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 *  VAR_OUTPUT

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 *  VAR_IN_OUT

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 *  VAR

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 *  VAR_TEMP

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 *  VAR_EXTERNAL

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 *  VAR_GLOBAL

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 *  VAR <var_name> AT <location>   -> Located variable!

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 * 

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 */

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/* Note:

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 *  The current_type_decl that this class returns may reference the

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 * name of a type, or the type declaration itself!

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 * For an example of the first, consider a variable declared as ...

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 * x : AAA;

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 * where the AAA type is previously declared as whatever.

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 * For an example of the second, consider a variable declared as ...

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 * x : array of int [10];  ---->  is allowed

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 *

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 * If it is the first, we will return a reference to the name, if the second

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 * we return a reference to the declaration!!

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 */

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class search_var_instance_decl_c: public search_visitor_c {

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  public:

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    search_var_instance_decl_c(symbol_c *search_scope);

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  public:

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    typedef enum {

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        input_vt   ,  // VAR_INPUT

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        output_vt  ,  // VAR_OUTPUT

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        inoutput_vt,  // VAR_IN_OUT

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        private_vt ,  // VAR

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        temp_vt    ,  // VAR_TEMP

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        external_vt,  // VAR_EXTERNAL

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        global_vt  ,  // VAR_GLOBAL

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        located_vt ,   // VAR <var_name> AT <location>

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        none_vt

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      } vt_t;

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    typedef enum {

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        constant_opt  ,

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        retain_opt    ,

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        non_retain_opt,

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        none_opt

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      } opt_t;

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#if 0        

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    /* the types of variables that need to be processed... */

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    static const unsigned int none_vt     = 0x0000;

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    static const unsigned int input_vt    = 0x0001;  // VAR_INPUT

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    static const unsigned int output_vt   = 0x0002;  // VAR_OUTPUT

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    static const unsigned int inoutput_vt = 0x0004;  // VAR_IN_OUT

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    static const unsigned int private_vt  = 0x0008;  // VAR

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    static const unsigned int temp_vt     = 0x0010;  // VAR_TEMP

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    static const unsigned int external_vt = 0x0020;  // VAR_EXTERNAL

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    static const unsigned int global_vt   = 0x0040;  // VAR_GLOBAL

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    static const unsigned int located_vt  = 0x0080;  // VAR <var_name> AT <location>

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    static const unsigned int none_opt        = 0x0000;

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    static const unsigned int constant_opt    = 0x0001;

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    static const unsigned int retain_opt      = 0x0002;

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    static const unsigned int non_retain_opt  = 0x0003;

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#endif    

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    symbol_c *   get_decl   (symbol_c *variable_instance_name); 

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    vt_t         get_vartype(symbol_c *variable_instance_name);

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    opt_t        get_option (symbol_c *variable_instance_name);

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    /* NOTE: The following function will be completely deleted in the (hopefully near) future. */

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    /* Returns true if the variable is an ARRAY or a STRUCT, otherwise returns false.

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     * Note that for FB, also returns false!

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     */

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    bool type_is_complex(symbol_c *variable_name);

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    bool type_is_fb(symbol_c *symbol);

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  private:

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    symbol_c *search_scope;

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    symbol_c *search_name;

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    symbol_c *current_type_decl;

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    /* variable used to store the type of variable currently being processed... */

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    /* Will contain a single value of generate_c_vardecl_c::XXXX_vt */

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    vt_t  current_vartype;

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    opt_t current_option;

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  private:

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

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    /* B 0 - Programming Model */

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

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    void *visit(library_c *symbol);

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

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    /* B 1.4.3 - Declaration & Initialisation */

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

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    /* edge -> The F_EDGE or R_EDGE directive */

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    // SYM_REF2(edge_declaration_c, edge, var1_list)

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    // TODO

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    void *visit(constant_option_c *symbol);

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    void *visit(retain_option_c *symbol);

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    void *visit(non_retain_option_c *symbol);

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    void *visit(input_declarations_c *symbol);

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    /* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */

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    /* option -> may be NULL ! */

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    void *visit(output_declarations_c *symbol);

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    /*  VAR_IN_OUT var_declaration_list END_VAR */

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    void *visit(input_output_declarations_c *symbol);

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    /* ENO : BOOL */

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    void *visit(eno_param_declaration_c *symbol);

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    /* VAR [CONSTANT] var_init_decl_list END_VAR */

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    /* option -> may be NULL ! */

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    /* helper symbol for input_declarations */

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    void *visit(var_declarations_c *symbol);

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    /*  VAR RETAIN var_init_decl_list END_VAR */

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    void *visit(retentive_var_declarations_c *symbol);

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    /*  VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */

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    /* option -> may be NULL ! */

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    //SYM_REF2(located_var_declarations_c, option, located_var_decl_list)

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    void *visit(located_var_declarations_c *symbol);

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    /*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */

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    /* option -> may be NULL ! */

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    //SYM_REF2(external_var_declarations_c, option, external_declaration_list)

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    void *visit(external_var_declarations_c *symbol);

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    /*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */

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    /* option -> may be NULL ! */

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    //SYM_REF2(global_var_declarations_c, option, global_var_decl_list)

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    void *visit(global_var_declarations_c *symbol);

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    /* var1_list is one of the following...

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     *    simple_spec_init_c *

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     *    subrange_spec_init_c *

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     *    enumerated_spec_init_c *

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     */

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    // SYM_REF2(var1_init_decl_c, var1_list, spec_init)

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    void *visit(var1_init_decl_c *symbol);

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    /* var1_list ',' variable_name */

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    // SYM_LIST(var1_list_c)

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    void *visit(var1_list_c *symbol);

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    /* name_list ':' function_block_type_name ASSIGN structure_initialization */

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    /* structure_initialization -> may be NULL ! */

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    void *visit(fb_name_decl_c *symbol);

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    /* name_list ',' fb_name */

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    void *visit(fb_name_list_c *symbol);

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    /* var1_list ':' array_spec_init */

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    // SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)

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    void *visit(array_var_init_decl_c *symbol);

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    /*  var1_list ':' initialized_structure */

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    // SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)

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    void *visit(structured_var_init_decl_c *symbol);

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    /*  var1_list ':' array_specification */

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    // SYM_REF2(array_var_declaration_c, var1_list, array_specification)

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    void *visit(array_var_declaration_c *symbol);

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    /*  var1_list ':' structure_type_name */

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    // SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)

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    void *visit(structured_var_declaration_c *symbol);

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    /*  [variable_name] location ':' located_var_spec_init */

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    /* variable_name -> may be NULL ! */

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    // SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)

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    // TODO!!

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    /*  global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */

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    // SYM_REF2(external_declaration_c, global_var_name, specification)

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    void *visit(external_declaration_c *symbol);

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    /*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */

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    /* type_specification ->may be NULL ! */

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    // SYM_REF2(global_var_decl_c, global_var_spec, type_specification)

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    void *visit(global_var_decl_c *symbol);

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    /*| global_var_name location */

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    //SYM_REF2(global_var_spec_c, global_var_name, location)

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    void *visit(global_var_spec_c *symbol);

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    /*| global_var_list ',' global_var_name */

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    //SYM_LIST(global_var_list_c)

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    void *visit(global_var_list_c *symbol);

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    /*  [variable_name] location ':' located_var_spec_init */

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    /* variable_name -> may be NULL ! */

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    //SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)

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    void *visit(located_var_decl_c *symbol);

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    /*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */

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    /* type_specification ->may be NULL ! */

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    // SYM_REF2(global_var_decl_c, global_var_spec, type_specification)

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    // TODO!!

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    /*  AT direct_variable */

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    // SYM_REF2(location_c, direct_variable, unused)

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    void *visit(location_c *symbol);

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    /*| global_var_list ',' global_var_name */

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    // SYM_LIST(global_var_list_c)

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    // TODO!!

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    /*  var1_list ':' single_byte_string_spec */

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    // SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)

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    void *visit(single_byte_string_var_declaration_c *symbol);

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    /*  STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */

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    /* integer ->may be NULL ! */

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    /* single_byte_character_string ->may be NULL ! */

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    // SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)

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    // TODO!!

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    /*  var1_list ':' double_byte_string_spec */

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    // SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)

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    void *visit(double_byte_string_var_declaration_c *symbol);

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    /*  WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */

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    /* integer ->may be NULL ! */

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    /* double_byte_character_string ->may be NULL ! */

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    // SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)

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    // TODO!!

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    /*  variable_name incompl_location ':' var_spec */

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    // SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)

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    // TODO!!

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    /*  AT incompl_location_token */

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    // SYM_TOKEN(incompl_location_c)

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    // TODO!!

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

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    /* B.1.5 - Program organization units */

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

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

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    /* B 1.5.1 - Functions */

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

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    // SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body)

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    void *visit(function_declaration_c *symbol);

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

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    /* B 1.5.2 - Function Blocks */

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

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    void *visit(function_block_declaration_c *symbol);

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

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    /* B 1.5.3 - Programs */

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

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    void *visit(program_declaration_c *symbol);

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

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    /* B.1.6  Sequential function chart elements */

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

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    /* | sequential_function_chart sfc_network */

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    // SYM_LIST(sequential_function_chart_c)

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    /* search_var_instance_decl_c inherits from serach_visitor_c, so no need to implement the following method. */

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    // void *visit(sequential_function_chart_c *symbol);

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    /* initial_step {step | transition | action} */

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    // SYM_LIST(sfc_network_c)

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    /* search_var_instance_decl_c inherits from serach_visitor_c, so no need to implement the following method. */

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    // void *visit(sfc_network_c *symbol);

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    /* INITIAL_STEP step_name ':' action_association_list END_STEP */

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    // SYM_REF2(initial_step_c, step_name, action_association_list)

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    void *visit(initial_step_c *symbol);

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    /* STEP step_name ':' action_association_list END_STEP */

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    // SYM_REF2(step_c, step_name, action_association_list)

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    void *visit(step_c *symbol);

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

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    /* B 1.7 Configuration elements */

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

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    /*

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    CONFIGURATION configuration_name

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       optional_global_var_declarations

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       (resource_declaration_list | single_resource_declaration)

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       optional_access_declarations

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       optional_instance_specific_initializations

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    END_CONFIGURATION

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    */

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    /*

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    SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)

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    */                                                                                                            

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    void *visit(configuration_declaration_c *symbol);

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    /*

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    RESOURCE resource_name ON resource_type_name

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       optional_global_var_declarations

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       single_resource_declaration

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    END_RESOURCE

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    */

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    // SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)

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    void *visit(resource_declaration_c *symbol);

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    /* task_configuration_list program_configuration_list */

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    // SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)

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    void *visit(single_resource_declaration_c *symbol);

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

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    /* B.2 - Language IL (Instruction List) */

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

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

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    /* B 2.1 Instructions and Operands */

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

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    /*| instruction_list il_instruction */

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    // SYM_LIST(instruction_list_c)

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    void *visit(instruction_list_c *symbol);

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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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    // SYM_LIST(statement_list_c)

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    void *visit(statement_list_c *symbol);

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}; // search_var_instance_decl_c

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