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#!/usr/bin/env ruby
def ngrams_it(s, n, fix=false)
a = s.strip.split
a.each_with_index { |tok, i|
tok.strip!
0.upto([n-1, a.size-i-1].min) { |m|
yield a[i..i+m] if !(fix^(a[i..i+m].size==n))
}
}
end
def main(n, fix, sep)
STDIN.set_encoding 'utf-8'
STDOUT.set_encoding 'utf-8'
while line = STDIN.gets
a = []
ngrams_it(line, n, fix) {|ng| a << ng.join(' ')}
a.reject! {|i| i.strip.size==0 }
puts a.join sep if a.size > 0
end
end
def usage
STDERR.write "./ng [-n <n>] [--fix] [--separator <s>] < <one number per line>\n"
exit 1
end
if __FILE__ == $0
require 'trollop'
opts = Trollop::options do
opt :n, "Ngrams", :type => :int, :default => 4
opt :fix, "Don't output lower order Ngrams.", :type => :bool, :default => true
opt :separator, "separte ngrams of a line by this string", :type => :string, :default => "\n"
end
usage if not [0,2,4,6].include? ARGV.size
main(opts[:n], opts[:fix], opts[:separator])
end
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