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module Rjb
class << self
private
# @return [String, nil] the valid version number. Can be nil.
def read_version
path = File.expand_path('../../../ext/rjb.c', __FILE__)
File.open(path) do |f|
f.each_line do |l|
m = /RJB_VERSION\s+"(.+?)"/.match(l)
# The file is closed even in this case.
return m[1] if m
end
end
end
end
# The `Rjb` module defines `VERSION` in the C code.
# If Rjb is already required we have the constant.
unless defined?(::Rjb::VERSION)
unless (VERSION = read_version)
raise 'Cannot find a valid version number in `rjb.c`!'
end
end
end
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