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module RSpec
module Support
LibraryVersionTooLowError = Class.new(StandardError)
# @private
class VersionChecker
def initialize(library_name, library_version, min_patch_level)
@library_name, @library_version = library_name, library_version
@min_patch_level = min_patch_level
@major, @minor, @patch = parse_version(library_version)
@min_major, @min_minor, @min_patch = parse_version(min_patch_level)
@comparison_result = compare_version
end
def check_version!
raise_too_low_error if too_low?
end
private
def too_low?
@comparison_result == :too_low
end
def raise_too_low_error
raise LibraryVersionTooLowError,
"You are using #{@library_name} #{@library_version}. " \
"RSpec requires version #{version_requirement}."
end
def compare_version
case
when @major < @min_major then :too_low
when @major > @min_major then :ok
when @minor < @min_minor then :too_low
when @minor > @min_minor then :ok
when @patch < @min_patch then :too_low
else :ok
end
end
def version_requirement
">= #{@min_patch_level}"
end
def parse_version(version)
version.split('.').map { |v| v.to_i }
end
end
end
end
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