parser grammar wrbparser;

@header{
	package parser;
}

options {
	language = Java;
	tokenVocab = wrblexer;
}

prog		: 	variable;
variable	:	( LETTER CONNECT )? term;
term		:	term ( ADD | SUB ) atom
			|	atom;
atom		:	atom ( MUL | DIV ) ( number | clipped )
			|	( number | clipped );
clipped		:	LBRACKET clipped ( ADD | SUB | MUL | DIV ) clippedterm RBRACKET
			|	LBRACKET clippedterm ( ADD | SUB | MUL | DIV ) clipped RBRACKET
			|	LBRACKET clippedterm RBRACKET;
clippedterm	:	clippedterm  ( ADD | SUB ) clippedatom
			|	clippedatom;
clippedatom	:	clippedatom ( MUL | DIV ) number
			|	number;
number		:	( SIGN )? PNUMBER ( POINT PNUMBER )?;