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module Grammar
class T
attr_accessor :word
def initialize word
@word = word
end
def to_s
"T<#{@word}>"
end
end
class NT
attr_accessor :symbol, :index, :span
def initialize symbol, index=0
@symbol = symbol
@index = index
@span = Span.new
end
def to_s
"NT(#{@span.left},#{@span.right})<#{@symbol},#{@index}>"
end
end
class Rule
attr_accessor :lhs, :rhs, :e
def initialize lhs=nil, rhs=[], e='', span=nil
@lhs = lhs
@rhs = rhs
@e = e
@lhs.span = span if span
end
def to_s
"#{lhs} -> #{rhs.map{ |i| i.to_s }.join ' '} [arity=#{arity}] ||| #{@e}"
end
def arity
rhs.select { |i| i.class == NT }.size
end
def from_s s, tail_spans=nil
nt_dict = {}
tail_spans.split(';').each { |i|
symbol, idx, span = i.split('|||')
nt_dict[idx.to_i] = span.gsub('(','').gsub(')','').split(',').map{|i|i.to_i}
}
_ = splitpipe s, 3
@lhs = NT.new _[0].strip.gsub!(/(\[|\])/, "")
q = 0
_[1].split.each { |x|
x.strip!
if x[0]=='[' && x[x.size-1] == ']'
@rhs << NT.new(x.gsub!(/(\[|\])/, "").split(',')[0])
@rhs.last.span.left = nt_dict[q][0]
@rhs.last.span.right = nt_dict[q][1]
q += 1
else
@rhs << T.new(x)
end
}
@e = _[2]
end
def self.from_s s, tail_spans=nil
r = self.new
r.from_s s, tail_spans
return r
end
end
class Span
attr_accessor :left, :right
def initialize left=nil, right=nil
@left = left
@right = right
end
end
class Grammar
attr_accessor :rules, :startn, :startt, :flat
def initialize fn
@rules = []; @startn = []; @startt = [] ;@flat = []
ReadFile.readlines_strip(fn).each_with_index { |s,i|
STDERR.write '.'; STDERR.write " #{i+1}\n" if (i+1)%80==0
@rules << Rule.from_s(s)
if @rules.last.rhs.first.class == NT
@startn << @rules.last
else
if rules.last.arity == 0
@flat << @rules.last
else
@startt << @rules.last
end
end
}
STDERR.write "\n"
end
def to_s
s = ''
@rules.each { |r| s += r.to_s+"\n" }
return s
end
def add_glue_rules
@rules.map { |r| r.lhs.symbol }.select { |s| s != 'S' }.uniq.each { |symbol|
@rules << Rule.new(NT.new('S'), [NT.new(symbol)])
@startn << @rules.last
@rules << Rule.new(NT.new('S'), [NT.new('S'), NT.new('X')])
@startn << @rules.last
}
end
def add_pass_through_rules s
s.each { |word|
@rules << Rule.new(NT.new('X'), [T.new(word)])
@flat << @rules.last
}
end
end
end # module
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