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require 'nlp_ruby'
class Terminal
attr_accessor :w
def initialize s
@w = s
end
def to_s
"T<#{@w}>"
end
end
class NonTerminal
attr_accessor :sym, :idx
def initialize sym, idx=0
@sym = sym
@idx = idx
end
def to_s
"NT<#{sym},#{idx}>"
end
end
class Span
attr_accessor :left, :right
def initialize left=nil, right=nil
@left = left
@right = right
end
end
class Rule
attr_accessor :lhs, :rhs, :span
def initialize lhs=nil, rhs=nil, span=nil
@lhs = ''
@rhs = []
end
def to_s
"#{lhs} -> #{rhs.map{|i|i.to_s}.join ' '} a:#{arity} (#{@span.left}, #{@span.right})"
end
def arity
rhs.reject { |i| i.class == Terminal }.size
end
def from_s s
a = splitpipe s, 3
@lhs = NonTerminal.new a[0].strip.gsub!(/(\[|\])/, "")
a[1].split.each { |i|
i.strip!
if i[0]=='[' && i[i.size-1] == ']'
@rhs << NonTerminal.new(i.gsub!(/(\[|\])/, "").split(',')[0])
else
@rhs << Terminal.new(i)
end
}
@span = Span.new
end
def self.from_s s
r = self.new
r.from_s s
r
end
end
class Grammar
attr_accessor :rules
def initialize fn
@rules = []
a = ReadFile.readlines_strip fn
a.each { |s| @rules << Rule.from_s(s) }
end
def to_s
s = ''
@rules.each { |r| s += r.to_s+"\n" }
s
end
end
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