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/*
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    OpenGEODE
    ANTLR 3.1.3 grammar for the SDL92 langage
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    Includes the following features from SDL2000+:
    - FOR loops in TASKs
    - Composite states
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    author: Maxime Perrotin
*/

grammar sdl92;

options {
    language=Python;
    output=AST;
    ASTLabelType=CommonTree;
    backtrack=true;
}

tokens {
        ACTION;
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        ALL;
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        ALTERNATIVE;
        ANSWER;
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        ARRAY;
        ASN1;
        ASSIGN;
        BITSTR;
        BLOCK;
        CHANNEL;
        CHOICE;
        CIF;
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        CLOSED_RANGE;
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        COMMENT;
        COMPOSITE_STATE;
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        CONDITIONAL;
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        CONNECT;
        CONNECTION;
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        CONSTANT;
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        CONSTANTS;
        DCL;
        DECISION;
        DIGITS;
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        ELSE;
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        EMPTYSTR;
        ENDNEWTYPE;
        ENDSYNTYPE;
        ENDTEXT;
        EXPORT;
        EXPRESSION;
        EXTERNAL;
        FI;
        FIELD;
        FIELD_NAME;
        FIELDS;
        FLOAT2;
        FLOAT;
        FLOATING_LABEL;
        FOR;
        FPAR;
        GROUND;
        HYPERLINK;
        IF;
        IFTHENELSE;
        IN;
        INFORMAL_TEXT;
        INOUT;
        INPUT;
        INPUT_NONE;
        INPUTLIST;
        JOIN;
        LABEL;
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        LITERAL;
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        NEG;
        NEWTYPE;
        NEXTSTATE;
        NUMBER_OF_INSTANCES;
        OCTSTR;
        OPEN_RANGE;
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        OUTPUT;
        OUTPUT_BODY;
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        PARAM;
        PARAMNAMES;
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        PARAMS;
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        PAREN;
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        PRIMARY;
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        PROCEDURE;
        PROCEDURE_CALL;
        PROCEDURE_NAME;
        PROCESS;
        PROVIDED;
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        QUESTION;
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        RANGE;
        RESET;
        RETURN;
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        ROUTE;
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        SAVE;
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        SELECTOR;
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        SEQOF;
        SEQUENCE;
        SET;
        SIGNAL;
        SIGNAL_LIST;
        SORT;
        STATE;
        STATELIST;
        STIMULUS;
        STOP;
        STRING;
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        STRUCT;
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        SYNONYM;
        SYNONYM_LIST;
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        SYNTYPE;
        SYSTEM;
        TASK;
        TASK_BODY;
        TERMINATOR;
        TEXT;
        TEXTAREA;
        TEXTAREA_CONTENT;
        THEN;
        TIMER;
        TO;
        TRANSITION;
        USE;
        VALUE;
        VARIABLE;
        VARIABLES;
        VIA;
        VIAPATH;
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}


/*
    Top level: any .pr file
*/

pr_file
        :       (use_clause
                | system_definition
                | process_definition)+;


system_definition
        :       SYSTEM system_name end
                entity_in_system*
                ENDSYSTEM system_name? end
        ->      ^(SYSTEM system_name entity_in_system*);


use_clause
        :       use_asn1?
                USE package_name end
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        ->      ^(USE use_asn1? end? package_name);
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/* Entity in system:
   Declare signals, external procedures, connections and blocks
*/
entity_in_system
        :       signal_declaration
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                | text_area
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                | procedure
                | channel
                | block_definition;

/* signal_declaration:
   e.g. SIGNAL open_door(typeA, typeB);
*/
signal_declaration
        :       paramnames?
                SIGNAL signal_id input_params? end
        ->      ^(SIGNAL paramnames? signal_id input_params?);


channel
        :       CHANNEL channel_id
                route+
                ENDCHANNEL end
        ->      ^(CHANNEL channel_id route+);


route
        :       FROM source_id TO dest_id WITH signal_id (',' signal_id)* end
        ->      ^(ROUTE source_id dest_id signal_id+);


block_definition
        :       BLOCK block_id end
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                entity_in_block*
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                ENDBLOCK end
        ->      ^(BLOCK block_id entity_in_block*);


/* Inside a SDL block:
   there can be nested blocks, processes, signalroutes and connections
   to above channels
*/
entity_in_block
        :       signal_declaration
                | signalroute
                | connection
                | block_definition
                | process_definition;


signalroute
        :       SIGNALROUTE route_id
                route+
        ->      ^(SIGNALROUTE route_id route+);


connection
        :       CONNECT channel_id AND route_id end
        ->      ^(CONNECTION channel_id route_id);


process_definition
        :       PROCESS process_id number_of_instances? REFERENCED end
        ->      ^(PROCESS process_id number_of_instances? REFERENCED)
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                | cif? PROCESS process_id number_of_instances? end
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                (text_area | procedure | composite_state)*
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                processBody? ENDPROCESS process_id?
                end
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        ->      ^(PROCESS cif? process_id number_of_instances? end?
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                text_area* procedure* composite_state* processBody?);
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// procedure: missing the RETURNS statement
// (TODO - but check new SDL2000 syntax that has no RETURNS token)
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procedure
        :       cif?
                PROCEDURE procedure_id end
                fpar?
                (text_area | procedure)*
                ((processBody? ENDPROCEDURE procedure_id?) | EXTERNAL)
                end
        ->      ^(PROCEDURE cif? procedure_id end? fpar?
                text_area* procedure* processBody? EXTERNAL?);


// Procedure formal parameters
fpar
        :       FPAR formal_variable_param
                (',' formal_variable_param)*
                end
        ->      ^(FPAR formal_variable_param+);


formal_variable_param
        :       (INOUT | IN)?
                variable_id (',' variable_id)* sort
        ->      ^(PARAM INOUT? IN? variable_id+ sort);


// text_area: TODO add operator description in content
text_area
        :       cif
                content?
                cif_end_text
        ->      ^(TEXTAREA cif content? cif_end_text);


// Text areas can contain textual procedures, FPAR declarations,
// and variable or timer declarations
content
        :        (procedure
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                 | use_clause
                 | signal_declaration
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                 | fpar
                 | timer_declaration
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                 | syntype_definition
                 | newtype_definition
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                 | variable_definition
                 | synonym_definition)*
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        ->       ^(TEXTAREA_CONTENT fpar* procedure* variable_definition*
                   syntype_definition* newtype_definition* timer_declaration*
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                   signal_declaration* use_clause* synonym_definition*);
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timer_declaration
        :       TIMER timer_id
                (',' timer_id)*
                end
        ->      ^(TIMER timer_id+);

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syntype_definition
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        :       SYNTYPE syntype_name '=' parent_sort
                (CONSTANTS (range_condition (',' range_condition)* ))?
                ENDSYNTYPE syntype_name? end
        ->      ^(SYNTYPE syntype_name parent_sort range_condition*);

syntype_name
        :       sort;
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parent_sort
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        :       sort;
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newtype_definition
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        :       NEWTYPE type_name (array_definition|structure_definition)?
                ENDNEWTYPE type_name? end
        ->      ^(NEWTYPE type_name array_definition* structure_definition*);
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type_name
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        :       sort;

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array_definition
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        :       ARRAY '(' sort ',' sort ')'
        ->      ^(ARRAY sort sort);
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structure_definition
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        :       STRUCT field_list end
        ->      ^(STRUCT field_list);
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field_list
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        :       field_definition (end field_definition)*
        ->      ^(FIELDS field_definition+);
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field_definition
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        :       field_name (',' field_name)* sort
        ->      ^(FIELD field_name+ sort);
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variable_definition
        :       DCL variables_of_sort
                (',' variables_of_sort)*
                end
        ->      ^(DCL variables_of_sort+);

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synonym_definition
        :       internal_synonym_definition;

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internal_synonym_definition
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        :       SYNONYM synonym_definition_item (',' synonym_definition_item)*
                end
        ->      ^(SYNONYM_LIST synonym_definition_item+);

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synonym_definition_item
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        :       sort sort '=' ground_expression
        ->      ^(SYNONYM sort sort ground_expression);
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variables_of_sort
        :       variable_id (',' variable_id)* sort (':=' ground_expression)?
        ->      ^(VARIABLES variable_id+ sort ground_expression?);


ground_expression
        :       expression
        ->      ^(GROUND expression);


number_of_instances
        :       '(' initial_number=INT ',' maximum_number=INT ')'
        ->      ^(NUMBER_OF_INSTANCES $initial_number $maximum_number);


processBody
        :       start? (state | floating_label)*;


start
        :       cif?
                hyperlink?
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                START name=state_entry_point_name? end
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                transition?
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        ->      ^(START cif? hyperlink? $name? end? transition?);
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floating_label
        :       cif?
                hyperlink?
                CONNECTION connector_name ':'
                transition?
                cif_end_label?
                ENDCONNECTION SEMI
        ->      ^(FLOATING_LABEL cif? hyperlink? connector_name transition?);


state
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        :       cif?
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                hyperlink?
                STATE statelist e=end
                (state_part)*
                ENDSTATE statename? f=end
        ->      ^(STATE cif? hyperlink? $e? statelist state_part*);


statelist
        :       ((statename)(',' statename)*)
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        ->      ^(STATELIST statename+)
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                | ASTERISK exception_state?
        ->      ^(ASTERISK exception_state?);


exception_state
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        :       '(' statename (',' statename)* ')'
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        ->      statename+;


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composite_state
        :       STATE statename e=end
                SUBSTRUCTURE
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                connection_points*
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                body=composite_state_body
                ENDSUBSTRUCTURE statename? f=end
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        ->      ^(COMPOSITE_STATE statename connection_points* $body $e?);
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connection_points
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        :       IN state_entry_exit_points end
        ->      ^(IN state_entry_exit_points end?)
                | OUT state_entry_exit_points end
        ->      ^(OUT state_entry_exit_points end?);
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state_entry_exit_points
        :       '(' statename (',' statename)* ')'
        ->      statename+;


composite_state_body
        :       (text_area | procedure | composite_state)*
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                start* (state | floating_label)*;
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state_part
        :       input_part
                //| priority_input        // Not supported
                | save_part               // Not supported in openGEODE
                | spontaneous_transition
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                | continuous_signal       // Not supoorted in openGEODE
                | connect_part;


// connect part is used to connect nested state exit points to a transition
connect_part
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        :       cif?
                hyperlink?
                CONNECT connect_list? end
                transition?
        ->      ^(CONNECT cif? hyperlink? connect_list? end? transition?);
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connect_list
        :       state_exit_point_name (',' state_exit_point_name)*
                -> state_exit_point_name+
                | ASTERISK;
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spontaneous_transition
        :       cif?
                hyperlink?
                INPUT NONE end
                enabling_condition?
                transition
        ->      ^(INPUT_NONE cif? hyperlink? transition);


enabling_condition
        :       PROVIDED expression end
        ->      ^(PROVIDED expression);


continuous_signal
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        :       PROVIDED expression end
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                (PRIORITY integer_literal_name=INT end)?
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                transition
        ->      ^(PROVIDED expression $integer_literal_name? transition);


save_part
        :       SAVE save_list
                end
        ->      ^(SAVE save_list);


save_list
        :       signal_list
                | asterisk_save_list;


asterisk_save_list
        :       ASTERISK;


signal_list
        :       signal_item (',' signal_item)*
        ->      ^(SIGNAL_LIST signal_item+);



// Signal_item alternatives are all of the same ID type.
// Should be resolved at semantic analysis.
signal_item
        :       signal_id; /* |
                priority_signal_id |
                signal_list_id |
                timer_id;*/

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/*   Not considered for the moment
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     (irrelevant in the scope of the generation of code for a single process)
priority_input
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        :       PRIORITY INPUT priority_input_list end transition;
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priority_input_list
        :       priority_stimulus (',' priority_stimulus)*;

priority_stimulus
        :       priority_signal_id ( '(' variable_id (',' variable_id)* ')');
*/


// this is only the "basic input part" from SDL92
input_part
        :       cif?
                hyperlink?
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                INPUT inputlist end
                enabling_condition?
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                transition?
        ->      ^(INPUT cif? hyperlink? end?
                inputlist enabling_condition? transition?);


// asterisk means: all signals not excplicitely specified
// (semantic is different from asterisk state)
inputlist
        :       ASTERISK
                | (stimulus (',' stimulus)*)
        ->      ^(INPUTLIST stimulus+);


stimulus
        :       stimulus_id input_params?;


input_params
        :       L_PAREN variable_id (',' variable_id)* R_PAREN
        ->      ^(PARAMS variable_id+);


transition
        :       action+ label? terminator_statement?
        ->      ^(TRANSITION action+ label? terminator_statement?)
                | terminator_statement
        ->      ^(TRANSITION terminator_statement);


action
        :       label?
                (task
                | task_body
                | output
                | create_request
                | decision
                | transition_option
                | set_timer
                | reset_timer
                | export     // Not supported in OpenGEODE
                | procedure_call);

export
        :       EXPORT
                L_PAREN variable_id (COMMA variable_id)* R_PAREN
                end
        ->      ^(EXPORT variable_id+);

/*
remote_procedure_call
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        :       CALL remote_procedure_call_body;
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remote_procedure_call_body
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        :       remote_procedure_id actual_parameters? (TO destination)?;
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*/


procedure_call
        :       cif?
                hyperlink?
                CALL procedure_call_body end
        ->      ^(PROCEDURE_CALL cif? hyperlink? end? procedure_call_body);


procedure_call_body
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        :       procedure_id actual_parameters?
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        ->      ^(OUTPUT_BODY procedure_id actual_parameters?);


set_timer
        :       SET set_statement (COMMA set_statement)*
                end
        ->      set_statement+;


set_statement
        :       L_PAREN (expression COMMA)? timer_id R_PAREN
        ->      ^(SET expression? timer_id);
        // ('('expression_list')')? ')'; (removed because of non-LL(*) problem)


reset_timer
        :       RESET reset_statement (',' reset_statement)*
                end
        ->      reset_statement+;


reset_statement
        :       timer_id ('(' expression_list ')')?
        ->      ^(RESET timer_id expression_list?);


transition_option
        :       ALTERNATIVE alternative_question e=end
                answer_part
                alternative_part
                ENDALTERNATIVE f=end
        ->      ^(ALTERNATIVE answer_part alternative_part);


alternative_part
        :       (answer_part+ else_part?)
        ->      answer_part+ else_part?
                | else_part
        ->      else_part;


alternative_question
        :       expression
                | informal_text;


decision
        :       cif?
                hyperlink?
                DECISION question e=end
                answer_part?
                alternative_part?
                ENDDECISION f=end
        ->      ^(DECISION cif? hyperlink? $e? question
                answer_part? alternative_part?);


answer_part
        :       cif?
                hyperlink?
                L_PAREN answer R_PAREN ':' transition?
        ->      ^(ANSWER cif? hyperlink? answer transition?);


answer
        :       range_condition
                | informal_text;


else_part
        :       cif?
                hyperlink?
                ELSE ':' transition?
        ->      ^(ELSE cif? hyperlink? transition?);


question
        :       expression
        ->      ^(QUESTION expression)
                | informal_text
        ->      informal_text
                | ANY
        ->      ^(ANY);


range_condition
        :       (closed_range | open_range);
                //(',' (closed_range|open_range))*;


closed_range
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        :       a=expression ':' b=expression
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        ->      ^(CLOSED_RANGE $a $b);


open_range
        :       constant
        ->      constant
                | ( (EQ|NEQ|GT|LT|LE|GE) constant)
        ->      ^(OPEN_RANGE EQ? NEQ? GT? LT? LE? GE? constant);


constant
        :       expression
        ->      ^(CONSTANT expression);


create_request
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        :       CREATE
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                createbody
                actual_parameters?
                end
        ->      ^(CREATE createbody actual_parameters?);


createbody
        :       process_id
                | THIS;


output
        :       cif?
                hyperlink?
                OUTPUT outputbody end
        ->      ^(OUTPUT cif? hyperlink? end? outputbody);


outputbody
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        :       outputstmt (',' outputstmt)* to_part?
        ->      ^(OUTPUT_BODY outputstmt+ to_part?);
 //               via_part?
 //     -> (signal_id actual_parameters?)+ to_part? via_part?;
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outputstmt
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        :       signal_id
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                actual_parameters?;

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to_part
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        :       (TO destination)
        ->      ^(TO destination);
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via_part
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        :       VIA viabody
        ->      ^(VIA viabody);
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// ambiguous in SDL92, added OR between ALL and via_path
viabody
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        :       ALL
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        ->      ^(ALL)
                | via_path
        ->      ^(VIAPATH via_path);


destination
        :       pid_expression
                | process_id
                | THIS;


via_path
        :       via_path_element (',' via_path_element)*
        ->      via_path_element+;


via_path_element
        :       ID; // signal_route_id | channel_id | gate_id;


actual_parameters
        :      '(' expression (',' expression)* ')'
        ->     ^(PARAMS expression+);


task
        :       cif?
                hyperlink?
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                TASK task_body? end
        ->      ^(TASK cif? hyperlink? end? task_body?);
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task_body
        :       (assignement_statement (',' assignement_statement)*)
        ->      ^(TASK_BODY assignement_statement+)
                | (informal_text (',' informal_text)*)
        ->      ^(TASK_BODY informal_text+)
                | (forloop (',' forloop)*)
        ->      ^(TASK_BODY forloop+)
        ;

// SDL extension - FOR loop in TASKs
forloop
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        :       FOR variable_id IN (range | variable) ':'
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                transition?
                ENDFOR
        ->      ^(FOR variable_id variable? range? transition?);

range
        :       RANGE
                L_PAREN a=ground_expression
                (COMMA b=ground_expression)? (COMMA step=INT)?
                R_PAREN
        ->      ^(RANGE $a $b? $step?);

assignement_statement
        :       variable ':=' expression
        ->      ^(ASSIGN variable expression);


// Variable: covers eg. toto(5)(4)!titi(3)!tutu!yoyo
variable
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        :       postfix_expression
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        |       ID                     ->  ^(VARIABLE ID);

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field_selection
        :       (('!'|'.') field_name);

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expression
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        :       binary_expression;

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binary_expression
        :       binary_expression_0 ( IMPLIES^ binary_expression_0)*;
binary_expression_0
        :       binary_expression_1 (( (OR^ ELSE?) | XOR^ ) binary_expression_1)*;
binary_expression_1
        :       binary_expression_2 ( AND^ THEN? binary_expression_2)*;
binary_expression_2
        :       binary_expression_3 (( EQ^ | NEQ^ | GT^ | GE^ | LT^ | LE^ | IN^ ) binary_expression_3)*;
binary_expression_3
        :       binary_expression_4 (( PLUS^ | DASH^ | APPEND^ ) binary_expression_4)*;
binary_expression_4
        :       unary_expression (( ASTERISK^ | DIV^ | MOD^ | REM^ ) unary_expression)*;

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unary_expression
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        :       postfix_expression
        |       primary_expression
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        |       NOT^ unary_expression
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        |       DASH unary_expression -> ^(NEG unary_expression)
        ;


postfix_expression
        :       (ID -> ^(PRIMARY ^(VARIABLE ID)))
                (   '(' params=expression_list ')' -> ^(CALL $postfix_expression ^(PARAMS $params))
                |   '!' field_name  -> ^(SELECTOR $postfix_expression field_name)
                )+
        ;

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primary_expression
        :       primary                       -> ^(PRIMARY primary)
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        |       '(' expression ')'            -> ^(PAREN expression)
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        |       conditional_expression
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        ;
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primary
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        :       BITSTR^
        |       OCTSTR^
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        |       TRUE^
        |       FALSE^
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        |       STRING
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        |       NULL^
        |       PLUS_INFINITY^
        |       MINUS_INFINITY^
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        |       INT^
        |       FLOAT^
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        |       ID ':' expression           -> ^(CHOICE ID expression)
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        |       ID                          -> ^(VARIABLE ID)
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        |       '{' '}'                     -> ^(EMPTYSTR)
        |       '{'
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                MANTISSA mant=INT COMMA
                BASE bas=INT COMMA
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                EXPONENT exp=INT
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                '}'                         -> ^(FLOAT2 $mant $bas $exp)
        |       '{'
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                named_value (COMMA named_value)*
                '}'                         -> ^(SEQUENCE named_value+)
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        |       '{'
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                primary (COMMA primary)*
                '}'                         -> ^(SEQOF primary+)
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        ;

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informal_text
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        :        STRING
        ->       ^(INFORMAL_TEXT STRING);
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// { a 5 } (SEQUENCE field value)
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named_value
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        :       ID expression;


primary_params
        :      '(' expression_list ')'
        ->     ^(PARAMS expression_list)
               | '!' literal_id
        ->     ^(FIELD_NAME literal_id);


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/* All cases are covered by the ground primary
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   above (Except structure primary, but we favour ASN.1 notation)
extended_primary
        :       synonym         |
                indexed_primary |
                field_primary   |
                structure_primary;
*/


indexed_primary
        :       primary '(' expression_list ')';


field_primary
        :       primary field_selection;


structure_primary
        :       '(.' expression_list '.)';
// Removed "qualifier" from the standard
// (to be put later, but never used in practice)


active_expression
        :       active_primary;


active_primary
        :       variable_access
                | operator_application
                | conditional_expression
                | imperative_operator
                | '(' active_expression ')'
                | 'ERROR';
   // active_extended_primary removed because not defined in the standard


imperative_operator
        :       now_expression
                | import_expression
                | pid_expression
                | view_expression
                | timer_active_expression
                | anyvalue_expression;


timer_active_expression
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        :       ACTIVE '(' timer_id ('(' expression_list ')')? ')';
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anyvalue_expression
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        :       ANY '(' sort ')';
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sort    :       sort_id
        ->      ^(SORT sort_id);


syntype :       syntype_id;


import_expression
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        :       IMPORT '(' remote_variable_id (',' destination)? ')';
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view_expression
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        :       VIEW '(' view_id (',' pid_expression)? ')';
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variable_access
        :       variable_id;


operator_application
        :       operator_id '('active_expression_list ')';


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active_expression_list
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        :       active_expression (',' expression_list)?;/* |
                ground_expression ',' active_expression_list;*/   // Will not work (recursion)


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//synonym :       ID; // synonym_id | external_synonym;
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external_synonym
        :       external_synonym_id;


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conditional_expression
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        :       IF ifexpr=expression
                THEN thenexpr=expression
                ELSE elseexpr=expression FI
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        ->      ^(CONDITIONAL $ifexpr $thenexpr $elseexpr);
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expression_list
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        :       expression (',' expression)*
        ->      expression+;


terminator_statement
        :       label?
                cif?
                hyperlink?
                terminator
                end
        ->      ^(TERMINATOR label? cif? hyperlink? end? terminator);

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