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module RandomData
# Defines methods for the generation of random data based on a supplied grammar.
module Grammar
# Returns simple sentences based on a supplied grammar, which must be a hash, the
# keys of which are symbols. The values are either an array of successive values or a grammar
# (i.e, hash with symbols as keys, and hashes or arrays as values. The arrays contain symbols
# referencing the keys in the present grammar, or strings to be output. The keys are always symbols.
#
# Example:
# Random.grammatical_construct({:story => [:man, " bites ", :dog], :man => { :bob => "Bob"}, :dog => {:a =>"Rex", :b =>"Rover"}}, :story)
# => "Bob bites Rover"
def grammatical_construct(grammar, what=nil)
output = ""
if what.nil?
case grammar
when Hash
a_key = grammar.keys.sort_by{rand}[0]
output += grammatical_construct(grammar, a_key)
when Array
grammar.each do |item|
output += grammatical_construct(item)
end
when String
output += grammar
end
else
rhs = grammar[what]
case rhs
when Array
rhs.each do |item|
case item
when Symbol
output += grammatical_construct(grammar,item)
when String
output += item
when Hash
output += grammatical_construct(item)
else
raise "#{item.inspect} must be a symbol or string or Hash"
end
end
when Hash
output+= grammatical_construct(rhs)
when Symbol
output += grammatical_construct(rhs)
when String
output += rhs
else
raise "#{rhs.inspect} must be a symbol, string, Array or Hash"
end
end
return output
end
end
end
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