oscript {
	%whitespace "[ \t\r\n]*";
	%none error;
	%none integer;
	%left '(' ')';
	%left '+' '-';
	%left '*' '/';
	%left '.' '=';
	%left '==' '>' '<' '>=' '<=' '!=' '!';
	%left ';';

	script : stmts [tmp];

	scope:
		'{' stmts '}' [scope]
		| '{' '}' [scope_empty];

	stmts:
			stmts stmt [stm_list_append]
		| stmt [stm_list_create];

	stmt:
			stm_var_def_new_type ';' [tmp]
		| stm_var_def_assign ';' [tmp]
		| stm_log ';' [tmp]
		| stm_assign ';' [tmp]
		| stm_while [tmp]
		| stm_return ';' [tmp]
		| stm_break ';' [tmp]
		| stm_if [tmp]
		| stm_def_class [tmp]
		| stm_def_method [tmp]
		| stm_ignore ';' [tmp]
	;

	stm_def_method: 'method' id '(' id_list ')' scope [stm_def_method];
	stm_def_class: 'class' id scope [stm_def_class];

	stm_if:
		'if' '(' expr ')' scope [stm_if]
		| 'if' '(' expr ')' scope 'else' scope [stm_if];

	stm_break: 'break' [stm_break];
	stm_return: 'return' expr [stm_return] | 'return' [stm_return];
	stm_while: 'while' '(' expr ')' scope [stm_while_loop];
	stm_var_def_new_type: 'var' id ':' id [stm_var_def_new_type];
	stm_var_def_assign: 'var' id '=' expr [stm_var_def_assign];
	stm_log: 'print' expr [stm_log];
	stm_assign : expr '=' expr [stm_assign];
	stm_ignore : expr [stm_ignore];

	expr_list:
			expr_list ',' expr ',' [expr_list_append]
		| expr [expr_list_create]
		| ;

	id_list:
			id_list ',' id ',' [id_list_append]
		| id [id_list_create]
		| ;

	expr:
			id '(' expr_list ')' [expr_function]
		|	expr '.' id '(' expr_list ')' [expr_method]
		|	expr '.' id [expr_child]
		| expr '==' expr [expr_bool_eq]
		| '!' expr [expr_bool_negate]
		| expr '!=' expr [expr_bool_neq]
		| expr '>' expr [expr_bool_grater]
		| expr '<' expr [expr_bool_lesser]
		| expr '>=' expr [expr_bool_grater_eq]
		| expr '<=' expr [expr_bool_lesser_eq]
		| expr '+' expr [expr_add]
		| expr '-' expr [expr_subtract]
		| expr '*' expr [expr_multiply]
		| expr '/' expr [expr_divide]
		| '(' expr ')' [expr_compound]
		| boolean [expr_bool]
		| integer [expr_int]
		| real [expr_float]
		| string [expr_string]
		| id [expr_id]
	;

	id: "[a-z]";
	boolean: "true|false";
	integer: "(\+|\-)?[0-9]+";
	real: "(\+|\-)?[0-9]+(\.[0-9]+)?((e|E)(\+|\-)?[0-9]+)?";
	string: "[\"']:string:";
}