example.g4

/*
 * This is an basic example show the various parsing and 
 */

grammar example;

//Parsing rules

//This is the statement that tells ANTLR the structure of the program.
programBlock
    :   programStat+; 
//Shows that one or more of the statements should exist in the program

//This tells ANTLR the different kinds of statements that will be present
programStat
    :   combineoperationStat
    |   transferOperationStat
    |   flutterOperationStat
    ;

//Defines the parser tree for the combine operation syntax
combineoperationStat
    :   'C' '(' INPUT_ID ',' OUTPUT_ID  '->' VALVE_ID ')'
    ;

//Defines the parser tree for the transfer operation syntax
transferOperationStat
    :   '[' 'T' '(' INPUT_ID '->' OUTPUT_ID ')' VOLUMES_PER_CYCLE_INT ']' 
        REPEAT_INT
    ;

//Defines the parser tree for the flutter operation syntax
flutterOperationStat
    :   'F' '(' VALVE_ID ')'
    ;

// Parameter parsing Rules
INPUT_ID    :   ID;
OUTPUT_ID   :   ID;
VALVE_ID    :   ID;
VOLUMES_PER_CYCLE_INT   :   INT;
REPEAT_INT  :   INT;

//Common Lexical Rules

ID  :	('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')*
    ; // For referencing variable names, etc.

INT :   [0-9]+ ; // Define token INT as one or more digits
WS  :   [ \t\r\n]+ -> skip ; // Define whitespace rule, toss it out

COMMENT :    '#' ~[\r\n]* -> skip //Standard one line comments
        ;