class Journey::Parser token SLASH LITERAL SYMBOL LPAREN RPAREN DOT STAR OR rule expressions : expressions expression { result = Cat.new(val.first, val.last) } | expression { result = val.first } | or ; expression : terminal | group | star ; group : LPAREN expressions RPAREN { result = Group.new(val[1]) } ; or : expressions OR expression { result = Or.new([val.first, val.last]) } ; star : STAR literal { result = Star.new(Symbol.new(val.last.left)) } ; terminal : symbol | literal | slash | dot ; slash : SLASH { result = Slash.new('/') } ; symbol : SYMBOL { result = Symbol.new(val.first) } ; literal : LITERAL { result = Literal.new(val.first) } dot : DOT { result = Dot.new(val.first) } ; end ---- header require 'journey/parser_extras'