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require 'strscan'
module ActionDispatch
module Journey # :nodoc:
module NFA # :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)
input = StringScanner.new(string)
state = tt.eclosure(0)
until input.eos?
sym = input.scan(%r([/.?]|[^/.?]+))
# FIXME: tt.eclosure is not needed for the GTG
state = tt.eclosure(tt.move(state, sym))
end
acceptance_states = state.find_all { |s|
tt.accepting?(tt.eclosure(s).sort.last)
}
return if acceptance_states.empty?
memos = acceptance_states.map { |x| tt.memo(x) }.flatten.compact
MatchData.new(memos)
end
alias :=~ :simulate
alias :match :simulate
end
end
end
end
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