grammar ptml;

root            : tree+ EOF;

tree    		: internal_node '{' (action_sign|tree)+ '}' ;
internal_node   : 'sequence' | 'selector' | 'parallel' Integer ;
action_sign     : ('task'|'cond') Names '(' action_parm? ')';
action_parm     : (Integer|Float|boolean) (',' (Integer|Float|boolean))* ;
// var_decls		: var_type Names ;
// var_type		: 'int' | 'float' | 'bool' | 'string' ;
boolean         : 'True' | 'False' ;

Names 			: [a-zA-Z_][a-zA-Z_0-9]* ;
Integer         : '-'?[1-9][0-9]* | '0' ;
Float           : [0-9]+'.'[0-9]* | '.'[0-9]+ ;

// comments
LINE_COMMENT    : '//' .*? '\r'?'\n' -> skip ;
// useless
WS				: [ \t\u000C\r\n]+ -> skip ;