diff options
Diffstat (limited to 'grammar.rb')
| -rw-r--r-- | grammar.rb | 30 |
1 files changed, 13 insertions, 17 deletions
@@ -13,23 +13,17 @@ class T end class NT - attr_accessor :symbol, :index, :left, :right + attr_accessor :symbol, :index - def initialize symbol=nil, index=nil, left=nil, right=nil + def initialize symbol=nil, index=nil @symbol = symbol @index = index - @left = left - @right = right end def from_s s - s.delete! '[]' - @symbol, meta = s.split '@' - if meta - span, index = meta.split ',' - @left, @right = span.split(':').map { |x| x.to_i } - @index = index.to_i - end + @symbol, @index = s.delete('[]').split ',' + @symbol.strip! + @index = @index.to_i-1 end def self.from_s s @@ -39,22 +33,23 @@ class NT end def to_s - "NT(#{@left},#{@right})<#{@symbol},#{@index}>" + "NT<#{@symbol},#{@index}>" end end class Rule attr_accessor :lhs, :rhs, :target, :map - def initialize lhs=nil, rhs=[], target=[] + def initialize lhs=nil, rhs=nil, target=nil, map=nil @lhs = lhs @rhs = rhs @target = target + @map = (map ? map : []) @arity_ = nil end def to_s - "#{@lhs} -> #{@rhs.map{ |i| i.to_s }.join ' '} ||| #{@target.map{ |i| i.to_s }.join ' '} [arity=#{arity}]" + "#{@lhs.to_s} -> #{@rhs.map{ |i| i.to_s }.join ' '} ||| #{@target.map{ |i| i.to_s }.join ' '} [arity=#{arity}]" end def arity @@ -62,12 +57,13 @@ class Rule return @arity_ end - def read_right_ s + def read_right_ s, fill_map=false _ = [] s.split.each { |x| x.strip! if x[0]=='[' && x[x.size-1] == ']' _ << NT.from_s(x) + @map << _.last.index if fill_map else _ << T.new(x) end @@ -79,10 +75,10 @@ class Rule lhs, rhs, target = splitpipe s, 3 @lhs = NT.from_s lhs @rhs = read_right_ rhs - @target = read_right_ target + @target = read_right_ target, true end - def self.from_s s + def self.from_s_x s r = self.new r.from_s s return r |