class Parser
Attributes
version[RW]
Public Class Methods
new() { |self| ... }
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# File lib/github_downloader/parser.rb, line 4 def initialize @options = [] @used_short = [] @default_values = nil yield self if block_given? end
Public Instance Methods
option(name, desc, settings = {})
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# File lib/github_downloader/parser.rb, line 11 def option(name, desc, settings = {}) @options << [name, desc, settings] end
process!(arguments = ARGV)
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# File lib/github_downloader/parser.rb, line 38 def process!(arguments = ARGV) @result = (@default_values || {}).clone # reset or new @optionparser ||= OptionParser.new do |p| # prepare only once @options.each do |o| @used_short << short = o[2][:short] || short_from(o[0]) @result[o[0]] = o[2][:default] || false # set default klass = o[2][:default].class == Fixnum ? Integer : o[2][:default].class if [TrueClass, FalseClass, NilClass].include?(klass) # boolean switch p.on("-" << short, "--[no-]" << o[0].to_s.gsub("_", "-"), o[1]) { |x| @result[o[0]] = x } else # argument with parameter p.on("-" << short, "--" << o[0].to_s.gsub("_", "-") << " " << o[2][:default].to_s, klass, o[1]) { |x| @result[o[0]] = x } end end p.banner = @banner unless @banner.nil? p.on_tail("-h", "--help", "Show this message") { puts p; exit } short = @used_short.include?("v") ? "-V" : "-v" p.on_tail(short, "--version", "Print version") { puts @version; exit } unless @version.nil? @default_values = @result.clone # save default values to reset @result in subsequent calls end begin @optionparser.parse!(arguments) rescue OptionParser::ParseError => e puts e.message; exit(1) end validate(@result) if self.respond_to?("validate") @result end
short_from(name)
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# File lib/github_downloader/parser.rb, line 15 def short_from(name) name.to_s.chars.each do |c| next if @used_short.include?(c) || c == "_" return c # returns from short_from method end end
validate(options)
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# File lib/github_downloader/parser.rb, line 22 def validate(options) # remove this method if you want fewer lines of code and don't need validations options.each_pair do |key, value| opt = @options.find_all { |o| o[0] == key }.first key = "--" << key.to_s.gsub("_", "-") unless opt[2][:value_in_set].nil? || opt[2][:value_in_set].include?(value) puts "Parameter for #{key} must be in [" << opt[2][:value_in_set].join(", ") << "]"; exit(1) end unless opt[2][:value_matches].nil? || opt[2][:value_matches] =~ value puts "Parameter for #{key} must match /" << opt[2][:value_matches].source << "/"; exit(1) end unless opt[2][:value_satisfies].nil? || opt[2][:value_satisfies].call(value) puts "Parameter for #{key} must satisfy given conditions (see description)"; exit(1) end end end