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# Copyright (c) [2021] SUSE LLC | ||
# | ||
# All Rights Reserved. | ||
# | ||
# This program is free software; you can redistribute it and/or modify it | ||
# under the terms of version 2 of the GNU General Public License as published | ||
# by the Free Software Foundation. | ||
# | ||
# This program is distributed in the hope that it will be useful, but WITHOUT | ||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
# more details. | ||
# | ||
# You should have received a copy of the GNU General Public License along | ||
# with this program; if not, contact SUSE LLC. | ||
# | ||
# To contact SUSE LLC about this file by physical or electronic mail, you may | ||
# find current contact information at www.suse.com. | ||
|
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module Y2Network | ||
# Represents a bitrate | ||
# | ||
# This class is not as generic as Y2Storage::DiskSize and it is used to support | ||
# parsing bitrates information from `iwlist`. However, it could be extended | ||
# in the future if needed. | ||
class Bitrate | ||
include Comparable | ||
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# Exception when trying to parse a string as a bitrate | ||
class ParseError < StandardError; end | ||
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PARSE_REGEXP = /\A(\d+(?:.\d+)?)\ *(\w+)?/.freeze | ||
private_constant :PARSE_REGEXP | ||
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UNITS = ["b", "kb", "Mb", "Gb"].freeze | ||
private_constant :UNITS | ||
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class << self | ||
# Parses a string and converts the value to a string | ||
# | ||
# @example Parsing Mb/s | ||
# bitrate = Bitrate.parse("54 Mb/s") | ||
# bitrate.to_i #=> 54000000 | ||
# bitrate.to_s #=> "54 Mb/s" | ||
# | ||
# @param str [String] String to parse | ||
# @return [Bitrate] | ||
# @raise ParseError | ||
def parse(str) | ||
match = PARSE_REGEXP.match(str) | ||
raise ParseError unless match | ||
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number, unit = match.captures | ||
unit ||= "b" | ||
power = UNITS.index(unit) | ||
raise ParseError unless power | ||
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new(number.to_i * (1000**power)) | ||
end | ||
end | ||
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# @param bits [Integer] Bits | ||
def initialize(bits) | ||
@bits = bits | ||
end | ||
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# @return [Integer] Return the bits | ||
def to_i | ||
@bits | ||
end | ||
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# Returns the string representation of the bitrate | ||
# | ||
# It automatically selects the unit to use depending on the bitrate value. | ||
# | ||
# @return [String] String representation | ||
def to_s | ||
power = (0..UNITS.length - 1).to_a.reverse.find do |u| | ||
to_i > (1000**u) | ||
end | ||
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units = UNITS[power] | ||
number = @bits.to_f / (1000**power) | ||
number_str = number.to_s.sub(".0", "") # strip insignificant zeroes | ||
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"#{number_str} #{units}/s" | ||
end | ||
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# Compare two bitrates | ||
# | ||
# @param other [Bitrate] | ||
# @return [Integer] | ||
def <=>(other) | ||
to_i <=> other.to_i | ||
end | ||
end | ||
end |
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# Copyright (c) [2021] SUSE LLC | ||
# | ||
# All Rights Reserved. | ||
# | ||
# This program is free software; you can redistribute it and/or modify it | ||
# under the terms of version 2 of the GNU General Public License as published | ||
# by the Free Software Foundation. | ||
# | ||
# This program is distributed in the hope that it will be useful, but WITHOUT | ||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
# more details. | ||
# | ||
# You should have received a copy of the GNU General Public License along | ||
# with this program; if not, contact SUSE LLC. | ||
# | ||
# To contact SUSE LLC about this file by physical or electronic mail, you may | ||
# find current contact information at www.suse.com. | ||
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require_relative "../test_helper" | ||
require "y2network/bitrate" | ||
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describe Y2Network::Bitrate do | ||
describe ".parse" do | ||
context "when the string contains a 'kb/s'" do | ||
it "returns an object representing the same value" do | ||
bitrate = described_class.parse("54 kb/s") | ||
expect(bitrate.to_i).to eq(54_000) | ||
end | ||
end | ||
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context "when the string contains a 'Mb/s'" do | ||
it "returns an object representing the same value" do | ||
bitrate = described_class.parse("54 Mb/s") | ||
expect(bitrate.to_i).to eq(54_000_000) | ||
end | ||
end | ||
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context "when the string contains a 'Gb/s'" do | ||
it "returns an object representing the same value" do | ||
bitrate = described_class.parse("1 Gb/s") | ||
expect(bitrate.to_i).to eq(1_000_000_000) | ||
end | ||
end | ||
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context "when the unit is missing from the string" do | ||
it "returns an object representing the same value" do | ||
bitrate = described_class.parse("64") | ||
expect(bitrate.to_i).to eq(64) | ||
end | ||
end | ||
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context "when the string cannot be parsed" do | ||
it "raises a ParseError exception" do | ||
expect { described_class.parse("something") } | ||
.to raise_error(Y2Network::Bitrate::ParseError) | ||
end | ||
end | ||
end | ||
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describe "#to_s" do | ||
context "Gb/s" do | ||
it "returns" do | ||
bitrate = described_class.new(54000000000) | ||
expect(bitrate.to_s).to eq("54 Gb/s") | ||
end | ||
end | ||
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context "Mb/s" do | ||
it "returns" do | ||
bitrate = described_class.new(54000000) | ||
expect(bitrate.to_s).to eq("54 Mb/s") | ||
end | ||
end | ||
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context "kb/s" do | ||
it "returns" do | ||
bitrate = described_class.new(54500) | ||
expect(bitrate.to_s).to eq("54.5 kb/s") | ||
end | ||
end | ||
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context "bits" do | ||
it "returns" do | ||
bitrate = described_class.new(128) | ||
expect(bitrate.to_s).to eq("128 b/s") | ||
end | ||
end | ||
end | ||
end |
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