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module Tins
module Subhash
# Create a subhash from this hash, that only contains key-value pairs
# matching +patterns+ and return it. +patterns+ can be for example /^foo/
# to put 'foobar' and 'foobaz' or 'foo'/:foo to put 'foo' into the subhash.
#
# If a block is given this method yields to it after the first pattern
# matched with a 3-tuple of +(key, value, match_data)+ using the return
# value of the block as the value of the result hash. +match_data+ is a
# MatchData instance if the matching pattern was a regular rexpression
# otherwise it is nil.
def subhash(*patterns)
patterns.map! do |pat|
pat = pat.to_sym.to_s if pat.respond_to?(:to_sym)
pat.respond_to?(:match) ? pat : pat.to_s
end
result =
if default_proc
self.class.new(&default_proc)
else
self.class.new(default)
end
if block_given?
each do |k, v|
patterns.each { |pat|
if pat === k.to_s
result[k] = yield(k, v, $~)
break
end
}
end
else
each do |k, v|
result[k] = v if patterns.any? { |pat| pat === k.to_s }
end
end
result
end
end
end
require 'tins/alias'
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