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module Similarity
def self.test(lexer_class)
# state_defintions is an InheritableHash, so we use `own_keys` to
# exclude states inherited from superclasses
state_names = Set.new(lexer_class.state_definitions.own_keys)
candidates = Rouge::Lexer.all.select do |x|
# we can only compare to RegexLexers which have state_definitions
next false unless x < Rouge::RegexLexer
# don't compare a lexer to itself or any subclasses
next false if x <= lexer_class
true
end
max_score = 1
matches = []
candidates.each do |candidate|
score = (state_names & candidate.state_definitions.keys).size
if score > max_score
max_score = score
matches = [candidate]
elsif score == max_score
matches << candidate
end
end
[max_score, matches]
end
end
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