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|
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'
|
