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require 'strscan'
module ActionDispatch
module Journey # :nodoc:
module GTG # :nodoc:
class MatchData # :nodoc:
attr_reader :memos
def initialize(memos)
@memos = memos
end
end
class Simulator # :nodoc:
attr_reader :tt
def initialize(transition_table)
@tt = transition_table
end
def simulate(string)
ms = memos(string) { return }
MatchData.new(ms)
end
alias :=~ :simulate
alias :match :simulate
def memos(string)
input = StringScanner.new(string)
state = [0]
while sym = input.scan(%r([/.?]|[^/.?]+))
state = tt.move(state, sym)
end
acceptance_states = state.find_all { |s|
tt.accepting? s
}
return yield if acceptance_states.empty?
acceptance_states.flat_map { |x| tt.memo(x) }.compact
end
end
end
end
end
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