/*
 * (c) 2003 Mario de Sousa
 *
 * Offered to the public under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * This code is made available on the understanding that it will not be
 * used in safety-critical situations without a full and competent review.
 */

/*
 * An IEC 61131-3 IL and ST compiler.
 *
 * Based on the
 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
 *
 */

/*
 * Definition of the Abstract Syntax data structure components
 */


/*
 * ABSYNTAX.DEF
 *
 * This generates the parse tree structure used to bind the components
 * identified by Bison in the correct syntax order. At the end of the
 * Bison analysis the tree is walked in a sequential fashion generating
 * the relavent code.
 */


/***************************/
/* 2.1.6 - Pragmas */
/***************************/
SYM_TOKEN(pragma_c)


/***************************/
/* B 0 - Programming Model */
/***************************/
SYM_LIST(library_c)


/*************************/
/* B.1 - Common elements */
/*************************/
/*******************************************/
/* B 1.1 - Letters, digits and identifiers */
/*******************************************/
SYM_TOKEN(identifier_c)


/*********************/
/* B 1.2 - Constants */
/*********************/

/******************************/
/* B 1.2.1 - Numeric Literals */
/******************************/
SYM_TOKEN(real_c)
SYM_TOKEN(integer_c)
SYM_TOKEN(binary_integer_c)
SYM_TOKEN(octal_integer_c)
SYM_TOKEN(hex_integer_c)

/* Note:
 * We do not have signed_integer_c and signed_real_c classes.
 * These are stored in the parse tree as a integer_c or real_c
 * preceded by a unary minus operator.
 */
/* Not required:
SYM_TOKEN(signed_integer_c)
SYM_TOKEN(signed_real_c)
*/

SYM_REF2(numeric_literal_c, type, value)
SYM_REF2(integer_literal_c, type, value)
SYM_REF2(real_literal_c, type, value)
SYM_REF2(bit_string_literal_c, type, value)
SYM_REF2(boolean_literal_c, type, value)

/* helper class for boolean_literal_c */
SYM_REF0(boolean_true_c)

/* helper class for boolean_literal_c */
SYM_REF0(boolean_false_c)


/*******************************/
/* B.1.2.2   Character Strings */
/*******************************/
SYM_TOKEN(double_byte_character_string_c)
SYM_TOKEN(single_byte_character_string_c)


/***************************/
/* B 1.2.3 - Time Literals */
/***************************/

/************************/
/* B 1.2.3.1 - Duration */
/************************/
SYM_REF0(neg_time_c)
SYM_REF2(duration_c, neg, interval)
SYM_TOKEN(fixed_point_c)
SYM_REF2(days_c, days, hours)
SYM_REF2(hours_c, hours, minutes)
SYM_REF2(minutes_c, minutes, seconds)
SYM_REF2(seconds_c, seconds, milliseconds)
SYM_REF2(milliseconds_c, milliseconds, unused)


/************************************/
/* B 1.2.3.2 - Time of day and Date */
/************************************/
SYM_REF2(time_of_day_c, daytime, unused)
SYM_REF4(daytime_c, day_hour, day_minute, day_second, unused)
SYM_REF2(date_c, date_literal, unused)
SYM_REF4(date_literal_c, year, month, day, unused)
SYM_REF2(date_and_time_c, date_literal, daytime)


/**********************/
/* B.1.3 - Data types */
/**********************/
/***********************************/
/* B 1.3.1 - Elementary Data Types */
/***********************************/
SYM_REF0(time_type_name_c)
SYM_REF0(bool_type_name_c)
SYM_REF0(sint_type_name_c)
SYM_REF0(int_type_name_c)
SYM_REF0(dint_type_name_c)
SYM_REF0(lint_type_name_c)
SYM_REF0(usint_type_name_c)
SYM_REF0(uint_type_name_c)
SYM_REF0(udint_type_name_c)
SYM_REF0(ulint_type_name_c)
SYM_REF0(real_type_name_c)
SYM_REF0(lreal_type_name_c)
SYM_REF0(date_type_name_c)
SYM_REF0(tod_type_name_c)
SYM_REF0(dt_type_name_c)
SYM_REF0(byte_type_name_c)
SYM_REF0(word_type_name_c)
SYM_REF0(dword_type_name_c)
SYM_REF0(lword_type_name_c)
SYM_REF0(string_type_name_c)
SYM_REF0(wstring_type_name_c)
SYM_REF0(constant_int_type_name_c)
SYM_REF0(constant_real_type_name_c)


/********************************/
/* B.1.3.2 - Generic data types */
/********************************/

/********************************/
/* B 1.3.3 - Derived data types */
/********************************/
/*  TYPE type_declaration_list END_TYPE */
SYM_REF2(data_type_declaration_c, type_declaration_list, unused)

/* helper symbol for data_type_declaration */
SYM_LIST(type_declaration_list_c)

/*  simple_type_name ':' simple_spec_init */
SYM_REF2(simple_type_declaration_c, simple_type_name, simple_spec_init)


/* simple_specification ASSIGN constant */
SYM_REF2(simple_spec_init_c, simple_specification, constant)

/*  subrange_type_name ':' subrange_spec_init */
SYM_REF2(subrange_type_declaration_c, subrange_type_name, subrange_spec_init)

/* subrange_specification ASSIGN signed_integer */
SYM_REF2(subrange_spec_init_c, subrange_specification, signed_integer)

/*  integer_type_name '(' subrange')' */
SYM_REF2(subrange_specification_c, integer_type_name, subrange)

/*  signed_integer DOTDOT signed_integer */
SYM_REF2(subrange_c, lower_limit, upper_limit)

/*  enumerated_type_name ':' enumerated_spec_init */
SYM_REF2(enumerated_type_declaration_c, enumerated_type_name, enumerated_spec_init)

/* enumerated_specification ASSIGN enumerated_value */
SYM_REF2(enumerated_spec_init_c, enumerated_specification, enumerated_value)

/* helper symbol for enumerated_specification->enumerated_spec_init */
/* enumerated_value_list ',' enumerated_value */
SYM_LIST(enumerated_value_list_c)

/* enumerated_type_name '#' identifier */
SYM_REF2(enumerated_value_c, type, value)

/*  identifier ':' array_spec_init */
SYM_REF2(array_type_declaration_c, identifier, array_spec_init)

/* array_specification [ASSIGN array_initialization} */
/* array_initialization may be NULL ! */
SYM_REF2(array_spec_init_c, array_specification, array_initialization)

/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
SYM_REF2(array_specification_c, array_subrange_list, non_generic_type_name)

/* helper symbol for array_specification */
/* array_subrange_list ',' subrange */
SYM_LIST(array_subrange_list_c)

/* array_initialization:  '[' array_initial_elements_list ']' */
/* helper symbol for array_initialization */
/* array_initial_elements_list ',' array_initial_elements */
SYM_LIST(array_initial_elements_list_c)

/* integer '(' [array_initial_element] ')' */
/* array_initial_element may be NULL ! */
SYM_REF2(array_initial_elements_c, integer, array_initial_element)

/*  structure_type_name ':' structure_specification */
SYM_REF2(structure_type_declaration_c, structure_type_name, structure_specification)

/* structure_type_name ASSIGN structure_initialization */
/* structure_initialization may be NULL ! */
SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)

/* helper symbol for structure_declaration */
/* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */
/* structure_element_declaration_list structure_element_declaration ';' */
SYM_LIST(structure_element_declaration_list_c)

/*  structure_element_name ':' *_spec_init */
SYM_REF2(structure_element_declaration_c, structure_element_name, spec_init)

/* helper symbol for structure_initialization */
/* structure_initialization: '(' structure_element_initialization_list ')' */
/* structure_element_initialization_list ',' structure_element_initialization */
SYM_LIST(structure_element_initialization_list_c)

/*  structure_element_name ASSIGN value */
SYM_REF2(structure_element_initialization_c, structure_element_name, value)

/*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
/*
 * NOTE:
 * (Summary: Contrary to what is expected, the
 *           string_type_declaration_c is not used to store
 *           simple string type declarations that do not include
 *           size limits.
 *           For e.g.:
 *             str1_type: STRING := "hello!"
 *           will be stored in a simple_type_declaration_c
 *           instead of a string_type_declaration_c.
 *           The following:
 *             str2_type: STRING [64] := "hello!"
 *           will be stored in a sring_type_declaration_c
 *
 *           Read on for why this is done...
 * End Summary)
 *
 * According to the spec, the valid construct
 * TYPE new_str_type : STRING := "hello!"; END_TYPE
 * has two possible routes to type_declaration...
 *
 * Route 1:
 * type_declaration: single_element_type_declaration
 * single_element_type_declaration: simple_type_declaration
 * simple_type_declaration: identifier ':' simple_spec_init
 * simple_spec_init: simple_specification ASSIGN constant
 * (shift:  identifier <- 'new_str_type')
 * simple_specification: elementary_type_name
 * elementary_type_name: STRING
 * (shift: elementary_type_name <- STRING)
 * (reduce: simple_specification <- elementary_type_name)
 * (shift: constant <- "hello!")
 * (reduce: simple_spec_init: simple_specification ASSIGN constant)
 * (reduce: ...)
 *
 *
 * Route 2:
 * type_declaration: string_type_declaration
 * string_type_declaration: identifier ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init
 * (shift:  identifier <- 'new_str_type')
 * elementary_string_type_name: STRING
 * (shift: elementary_string_type_name <- STRING)
 * (shift: string_type_declaration_size <-  empty )
 * string_type_declaration_init: ASSIGN character_string
 * (shift: character_string <- "hello!")
 * (reduce: string_type_declaration_init <- ASSIGN character_string)
 * (reduce: string_type_declaration <- identifier ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init )
 * (reduce: type_declaration <- string_type_declaration)
 *
 *
 * At first glance it seems that removing route 1 would make
 * the most sense. Unfortunately the construct 'simple_spec_init'
 * shows up multiple times in other rules, so changing this construct
 * would also mean changing all the rules in which it appears.
 * I (Mario) therefore chose to remove route 2 instead. This means
 * that the above declaration gets stored in a
 * simple_type_declaration_c, and not in a string_type_declaration_c
 * as would be expected!
 */
/*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
SYM_REF4(string_type_declaration_c,	string_type_name,
					elementary_string_type_name,
					string_type_declaration_size,
					string_type_declaration_init) /* may be == NULL! */


/*********************/
/* B 1.4 - Variables */
/*********************/
SYM_REF2(symbolic_variable_c, var_name, unused)

/********************************************/
/* B.1.4.1   Directly Represented Variables */
/********************************************/
SYM_TOKEN(direct_variable_c)

/*************************************/
/* B.1.4.2   Multi-element Variables */
/*************************************/
/*  subscripted_variable '[' subscript_list ']' */
SYM_REF2(array_variable_c, subscripted_variable, subscript_list)

/* subscript_list ',' subscript */
SYM_LIST(subscript_list_c)

/*  record_variable '.' field_selector */
/*  WARNING: input and/or output variables of function blocks
 *           may be accessed as fields of a structured variable!
 *           Code handling a structured_variable_c must take
 *           this into account!
 */
SYM_REF2(structured_variable_c, record_variable, field_selector)

/******************************************/
/* B 1.4.3 - Declaration & Initialisation */
/******************************************/
SYM_REF0(constant_option_c)
SYM_REF0(retain_option_c)
SYM_REF0(non_retain_option_c)

/* option -> the RETAIN/NON_RETAIN/<NULL> directive... */
SYM_REF2(input_declarations_c, option, input_declaration_list)

/* helper symbol for input_declarations */
SYM_LIST(input_declaration_list_c)

/* edge -> The F_EDGE or R_EDGE directive */
SYM_REF2(edge_declaration_c, edge, var1_list)

SYM_REF0(raising_edge_option_c)
SYM_REF0(falling_edge_option_c)

/* spec_init is one of the following...
 *    simple_spec_init_c *
 *    subrange_spec_init_c *
 *    enumerated_spec_init_c *
 */
SYM_REF2(var1_init_decl_c, var1_list, spec_init)

/* | var1_list ',' variable_name */
SYM_LIST(var1_list_c)

/* var1_list ':' array_spec_init */
SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)

/*  var1_list ':' initialized_structure */
SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)

/* fb_name_list ':' function_block_type_name ASSIGN structure_initialization */
/* structure_initialization -> may be NULL ! */
SYM_REF4(fb_name_decl_c, fb_name_list, function_block_type_name, structure_initialization, unused)

/* fb_name_list ',' fb_name */
SYM_LIST(fb_name_list_c)

/* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */
/* option -> may be NULL ! */
SYM_REF2(output_declarations_c, option, var_init_decl_list)

/*  VAR_IN_OUT var_declaration_list END_VAR */
SYM_REF2(input_output_declarations_c, var_declaration_list, unused)

/* helper symbol for input_output_declarations */
/* var_declaration_list var_declaration ';' */
SYM_LIST(var_declaration_list_c)

/*  var1_list ':' array_specification */
SYM_REF2(array_var_declaration_c, var1_list, array_specification)

/*  var1_list ':' structure_type_name */
SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)

/* VAR [CONSTANT] var_init_decl_list END_VAR */
/* option -> may be NULL ! */
SYM_REF2(var_declarations_c, option, var_init_decl_list)

/*  VAR RETAIN var_init_decl_list END_VAR */
SYM_REF2(retentive_var_declarations_c, var_init_decl_list, unused)

/*  VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */
/* option -> may be NULL ! */
SYM_REF2(located_var_declarations_c, option, located_var_decl_list)

/* helper symbol for located_var_declarations */
/* located_var_decl_list located_var_decl ';' */
SYM_LIST(located_var_decl_list_c)

/*  [variable_name] location ':' located_var_spec_init */
/* variable_name -> may be NULL ! */
SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)

/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */
/* option -> may be NULL ! */
SYM_REF2(external_var_declarations_c, option, external_declaration_list)

/* helper symbol for external_var_declarations */
/*| external_declaration_list external_declaration';' */
SYM_LIST(external_declaration_list_c)

/*  global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */
SYM_REF2(external_declaration_c, global_var_name, specification)

/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */
/* option -> may be NULL ! */
SYM_REF2(global_var_declarations_c, option, global_var_decl_list)

/* helper symbol for global_var_declarations */
/*| global_var_decl_list global_var_decl ';' */
SYM_LIST(global_var_decl_list_c)

/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
/* type_specification ->may be NULL ! */
SYM_REF2(global_var_decl_c, global_var_spec, type_specification)

/*| global_var_name location */
SYM_REF2(global_var_spec_c, global_var_name, location)

/*  AT direct_variable */
SYM_REF2(location_c, direct_variable, unused)

/*| global_var_list ',' global_var_name */
SYM_LIST(global_var_list_c)

/*  var1_list ':' single_byte_string_spec */
SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)

/*  STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
/* integer ->may be NULL ! */
/* single_byte_character_string ->may be NULL ! */
SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)

/*  var1_list ':' double_byte_string_spec */
SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)

/*  WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
/* integer ->may be NULL ! */
/* double_byte_character_string ->may be NULL ! */
SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)

/*| VAR [RETAIN|NON_RETAIN] incompl_located_var_decl_list END_VAR */
/* option ->may be NULL ! */
SYM_REF2(incompl_located_var_declarations_c, option, incompl_located_var_decl_list)

/* helper symbol for incompl_located_var_declarations */
/*| incompl_located_var_decl_list incompl_located_var_decl ';' */
SYM_LIST(incompl_located_var_decl_list_c)

/*  variable_name incompl_location ':' var_spec */
SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)

/*  AT incompl_location_token */
SYM_TOKEN(incompl_location_c)

/* intermediate helper symbol for:
 *  - non_retentive_var_decls
 *  - output_declarations
 */
SYM_LIST(var_init_decl_list_c)




/**************************************/
/* B.1.5 - Program organization units */
/**************************************/
/***********************/
/* B 1.5.1 - Functions */
/***********************/
SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body)

/* intermediate helper symbol for
 * - function_declaration
 * - function_block_declaration
 * - program_declaration
 */
SYM_LIST(var_declarations_list_c)

/* option -> storage method, CONSTANT or <null> */
SYM_REF2(function_var_decls_c, option, decl_list)

/* intermediate helper symbol for function_var_decls */
SYM_LIST(var2_init_decl_list_c)


/*****************************/
/* B 1.5.2 - Function Blocks */
/*****************************/
/*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
SYM_REF4(function_block_declaration_c, fblock_name, var_declarations, fblock_body, unused)

/* intermediate helper symbol for function_declaration */
/*  { io_var_declarations | other_var_declarations }   */
/*
 * NOTE: we re-use the var_declarations_list_c
 */

/*  VAR_TEMP temp_var_decl_list END_VAR */
SYM_REF2(temp_var_decls_c, var_decl_list, unused)

/* intermediate helper symbol for temp_var_decls */
SYM_LIST(temp_var_decls_list_c)

/*  VAR NON_RETAIN var_init_decl_list END_VAR */
SYM_REF2(non_retentive_var_decls_c, var_decl_list, unused)


/**********************/
/* B 1.5.3 - Programs */
/**********************/
/*  PROGRAM program_type_name program_var_declarations_list function_block_body END_PROGRAM */
SYM_REF4(program_declaration_c, program_type_name, var_declarations, function_block_body, unused)

/* intermediate helper symbol for program_declaration_c */
/*  { io_var_declarations | other_var_declarations }   */
/*
 * NOTE: we re-use the var_declarations_list_c
 */



/*********************************************/
/* B.1.6  Sequential function chart elements */
/*********************************************/

SYM_LIST(sequential_function_chart_c)

SYM_LIST(sfc_network_c)

SYM_REF2(initial_step_c, step_name, action_association_list)

SYM_LIST(action_association_list_c)
SYM_REF2(step_c, step_name, action_association_list)
SYM_REF4(action_association_c, action_name, action_qualifier, indicator_name_list, unused)

SYM_TOKEN(qualifier_c)
SYM_TOKEN(timed_qualifier_c)

SYM_LIST(indicator_name_list_c)

SYM_REF2(action_qualifier_c, action_qualifier, action_time)

SYM_REF6(transition_c, transition_name, integer, from_steps, to_steps, transition_condition_il, transition_condition_st)

SYM_REF2(steps_c, step_name, step_name_list)

SYM_LIST(step_name_list_c)

SYM_REF2(action_c, action_name, function_block_body)

/********************************/
/* B 1.7 Configuration elements */
/********************************/

/*
CONFIGURATION configuration_name
   optional_global_var_declarations
   (resource_declaration_list | single_resource_declaration)
   optional_access_declarations
   optional_instance_specific_initializations
END_CONFIGURATION
*/
SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)

/* helper symbol for configuration_declaration */
SYM_LIST(resource_declaration_list_c)

/*
RESOURCE resource_name ON resource_type_name
   optional_global_var_declarations
   single_resource_declaration
END_RESOURCE
*/
SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)

/* task_configuration_list program_configuration_list */
SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)

/* helper symbol for single_resource_declaration */
SYM_LIST(task_configuration_list_c)

/* helper symbol for single_resource_declaration */
SYM_LIST(program_configuration_list_c)

/* helper symbol for
 *  - access_path
 *  - instance_specific_init
 */
SYM_LIST(any_fb_name_list_c)

/*  [resource_name '.'] global_var_name ['.' structure_element_name] */
SYM_REF4(global_var_reference_c, resource_name, global_var_name, structure_element_name, unused)

/*  prev_declared_program_name '.' symbolic_variable */
SYM_REF2(program_output_reference_c, program_name, symbolic_variable)

/*  TASK task_name task_initialization */
SYM_REF2(task_configuration_c, task_name, task_initialization)

/*  '(' [SINGLE ASSIGN data_source ','] [INTERVAL ASSIGN data_source ','] PRIORITY ASSIGN integer ')' */
SYM_REF4(task_initialization_c, single_data_source, interval_data_source, priority_data_source, unused)

/*  PROGRAM [RETAIN | NON_RETAIN] program_name [WITH task_name] ':' program_type_name ['(' prog_conf_elements ')'] */
SYM_REF6(program_configuration_c, retain_option, program_name, task_name, program_type_name, prog_conf_elements, unused)

/* prog_conf_elements ',' prog_conf_element */
SYM_LIST(prog_conf_elements_c)

/*  fb_name WITH task_name */
SYM_REF2(fb_task_c, fb_name, task_name)

/*  any_symbolic_variable ASSIGN prog_data_source */
SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source)

/* any_symbolic_variable SENDTO data_sink */
SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, data_sink)

/* VAR_CONFIG instance_specific_init_list END_VAR */
SYM_REF2(instance_specific_initializations_c, instance_specific_init_list, unused)

/* helper symbol for instance_specific_initializations */
SYM_LIST(instance_specific_init_list_c)

/* resource_name '.' program_name '.' {fb_name '.'}
    ((variable_name [location] ':' located_var_spec_init) | (fb_name ':' fb_initialization))
*/
SYM_REF6(instance_specific_init_c, resource_name, program_name, any_fb_name_list, variable_name, location, initialization)

/* helper symbol for instance_specific_init */
/* function_block_type_name ':=' structure_initialization */
SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization)



/****************************************/
/* B.2 - Language IL (Instruction List) */
/****************************************/
/***********************************/
/* B 2.1 Instructions and Operands */
/***********************************/
/*| instruction_list il_instruction */
SYM_LIST(instruction_list_c)

/* | label ':' [il_incomplete_instruction] eol_list */
SYM_REF2(il_instruction_c, label, il_instruction)


/* | il_simple_operator [il_operand] */
SYM_REF2(il_simple_operation_c, il_simple_operator, il_operand)

/* | function_name [il_operand_list] */
SYM_REF2(il_function_call_c, function_name, il_operand_list)


/* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */
SYM_REF4(il_expression_c, il_expr_operator, il_operand, simple_instr_list, unused)

/*  il_jump_operator label */
SYM_REF2(il_jump_operation_c, il_jump_operator, label)

/*   il_call_operator prev_declared_fb_name
 * | il_call_operator prev_declared_fb_name '(' ')'
 * | il_call_operator prev_declared_fb_name '(' eol_list ')'
 * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
 * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
 */
SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list)


/* | function_name '(' eol_list [il_param_list] ')' */
SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)

/* | il_operand_list ',' il_operand */
SYM_LIST(il_operand_list_c)

/* | simple_instr_list il_simple_instruction */
SYM_LIST(simple_instr_list_c)

/* | il_initial_param_list il_param_instruction */
SYM_LIST(il_param_list_c)

/*  il_assign_operator il_operand
 * | il_assign_operator '(' eol_list simple_instr_list ')'
 */
SYM_REF4(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list, unused)

/*  il_assign_out_operator variable */
SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable)



/*******************/
/* B 2.2 Operators */
/*******************/
SYM_REF0(LD_operator_c)
SYM_REF0(LDN_operator_c)
SYM_REF0(ST_operator_c)
SYM_REF0(STN_operator_c)
SYM_REF0(NOT_operator_c)
SYM_REF0(S_operator_c)
SYM_REF0(R_operator_c)
SYM_REF0(S1_operator_c)
SYM_REF0(R1_operator_c)
SYM_REF0(CLK_operator_c)
SYM_REF0(CU_operator_c)
SYM_REF0(CD_operator_c)
SYM_REF0(PV_operator_c)
SYM_REF0(IN_operator_c)
SYM_REF0(PT_operator_c)
SYM_REF0(AND_operator_c)
SYM_REF0(OR_operator_c)
SYM_REF0(XOR_operator_c)
SYM_REF0(ANDN_operator_c)
SYM_REF0(ORN_operator_c)
SYM_REF0(XORN_operator_c)
SYM_REF0(ADD_operator_c)
SYM_REF0(SUB_operator_c)
SYM_REF0(MUL_operator_c)
SYM_REF0(DIV_operator_c)
SYM_REF0(MOD_operator_c)
SYM_REF0(GT_operator_c)
SYM_REF0(GE_operator_c)
SYM_REF0(EQ_operator_c)
SYM_REF0(LT_operator_c)
SYM_REF0(LE_operator_c)
SYM_REF0(NE_operator_c)
SYM_REF0(CAL_operator_c)
SYM_REF0(CALC_operator_c)
SYM_REF0(CALCN_operator_c)
SYM_REF0(RET_operator_c)
SYM_REF0(RETC_operator_c)
SYM_REF0(RETCN_operator_c)
SYM_REF0(JMP_operator_c)
SYM_REF0(JMPC_operator_c)
SYM_REF0(JMPCN_operator_c)

/*| [NOT] any_identifier SENDTO */
SYM_REF2(il_assign_out_operator_c, option, variable_name)



/***************************************/
/* B.3 - Language ST (Structured Text) */
/***************************************/
/***********************/
/* B 3.1 - Expressions */
/***********************/
SYM_REF2(or_expression_c, l_exp, r_exp)
SYM_REF2(xor_expression_c, l_exp, r_exp)
SYM_REF2(and_expression_c, l_exp, r_exp)
SYM_REF2(equ_expression_c, l_exp, r_exp)
SYM_REF2(notequ_expression_c, l_exp, r_exp)
SYM_REF2(lt_expression_c, l_exp, r_exp)
SYM_REF2(gt_expression_c, l_exp, r_exp)
SYM_REF2(le_expression_c, l_exp, r_exp)
SYM_REF2(ge_expression_c, l_exp, r_exp)
SYM_REF2(add_expression_c, l_exp, r_exp)
SYM_REF2(sub_expression_c, l_exp, r_exp)
SYM_REF2(mul_expression_c, l_exp, r_exp)
SYM_REF2(div_expression_c, l_exp, r_exp)
SYM_REF2(mod_expression_c, l_exp, r_exp)
SYM_REF2(power_expression_c, l_exp, r_exp)
SYM_REF2(neg_expression_c, exp, unused)
SYM_REF2(not_expression_c, exp, unused)

SYM_REF2(function_invocation_c, function_name, parameter_assignment_list)


/********************/
/* B 3.2 Statements */
/********************/
SYM_LIST(statement_list_c)


/*********************************/
/* B 3.2.1 Assignment Statements */
/*********************************/
SYM_REF2(assignment_statement_c, l_exp, r_exp)


/*****************************************/
/* B 3.2.2 Subprogram Control Statements */
/*****************************************/
/*  RETURN */
SYM_REF0(return_statement_c)

/* fb_name '(' [param_assignment_list] ')' */
/* param_assignment_list -> may be NULL ! */
SYM_REF2(fb_invocation_c, fb_name, param_assignment_list)

/* helper symbol for fb_invocation */
/* param_assignment_list ',' param_assignment */
SYM_LIST(param_assignment_list_c)

/*  variable_name ASSIGN expression */
SYM_REF2(input_variable_param_assignment_c, variable_name, expression)

/* [NOT] variable_name '=>' variable */
SYM_REF4(output_variable_param_assignment_c, not_param, variable_name, variable, unused)

/* helper CLASS for output_variable_param_assignment */
SYM_REF0(not_paramassign_c)


/********************************/
/* B 3.2.3 Selection Statements */
/********************************/
/* IF expression THEN statement_list elseif_statement_list ELSE statement_list END_IF */
SYM_REF4(if_statement_c, expression, statement_list, elseif_statement_list, else_statement_list)

/* helper symbol for if_statement */
SYM_LIST(elseif_statement_list_c)

/* helper symbol for elseif_statement_list */
/* ELSIF expression THEN statement_list    */
SYM_REF2(elseif_statement_c, expression, statement_list)

/* CASE expression OF case_element_list ELSE statement_list END_CASE */
SYM_REF4(case_statement_c, expression, case_element_list, statement_list, unused)

/* helper symbol for case_statement */
SYM_LIST(case_element_list_c)

/*  case_list ':' statement_list */
SYM_REF2(case_element_c, case_list, statement_list)

SYM_LIST(case_list_c)


/********************************/
/* B 3.2.4 Iteration Statements */
/********************************/
/*  FOR control_variable ASSIGN expression TO expression [BY expression] DO statement_list END_FOR */
SYM_REF6(for_statement_c, control_variable, beg_expression, end_expression, by_expression, statement_list, unused)

/*  WHILE expression DO statement_list END_WHILE */
SYM_REF2(while_statement_c, expression, statement_list)

/*  REPEAT statement_list UNTIL expression END_REPEAT */
SYM_REF2(repeat_statement_c, statement_list, expression)

/*  EXIT */
SYM_REF0(exit_statement_c)