mycgi

mycgi.rb

require 'cgi'
# trying to make cgi.rb suck a tad bit less.
# the main thing I care about is clean, error-free parameter input.
# brendan o'connor (brenocon@gmail.com)

class MyCGI < CGI
  def initialize
    super("html3")
    @converted_opts = {}
  end

  def opt name, opts={}
    self.class.send :define_method, name.to_sym do
      @converted_opts[name.to_sym]
    end
    # if opts[:default].andand.is_a? Array
    @converted_opts[name.to_sym] = get(name, opts)
  end

  # def method_missing(msg, *args)
  #   @converted_opts[msg] || get(msg)
  # end

  def get(k, opts={})
    k=k.to_s
    if params.keys.include?(k)
      type_convert k, params[k][0], opts
    else
      opts[:default]
    end
  end

  TYPES = [:boolean, :bool, :int, :integer, :string, :double, :float]
  FLOAT_RE = /^-?((\d+(\.\d+)?)|(\.\d+))$/

  def type_convert(name, value, opts)
    # stolen from Trollop, the one true Ruby commandline option parser.
    opts[:type] = 
      case opts[:type]
      when :boolean, :bool; :bool
      when :int, :integer; :int
      when :string; :string
      when :double, :float; :float
      when Class
        case opts[:type].to_s # sigh... there must be a better way to do this
        when 'TrueClass', 'FalseClass'; :bool
        when 'String'; :string
        when 'Integer'; :int
        when 'Float'; :float
        else
          raise ArgumentError, "unsupported argument type '#{opts[:type].class.name}'"
        end
      when nil; nil
      else
        raise ArgumentError, "unsupported argument type '#{opts[:type]}'" unless TYPES.include?(opts[:type])
      end

    type_from_default =
      case opts[:default]
      when Integer; :int
      when Numeric; :float
      when TrueClass, FalseClass; :bool
      when String; :string
      when nil; nil
      else
        raise ArgumentError, "unsupported argument type '#{opts[:default].class.name}'"
      end

    raise ArgumentError, ":type specification and default type don't match" if opts[:type] && type_from_default && opts[:type] != type_from_default

    # opts[:type] = (opts[:type] || type_from_default || raise("Need :type or :default for every param!"))
    opts[:type] = (opts[:type] || type_from_default || :string)


    return opts[:default] if value.blank?

    case opts[:type]
    when :bool
      value=='y'  ?  true :
      value=='n'  ?  false :
      raise("option '#{name}' needs a boolean-coercible value, but got #{value.inspect}")
    when :int
      raise "option '#{name}' needs an integer but got #{value.inspect}" unless value =~ /^\d+$/
      value.to_i
    when :float
      raise CommandlineError, "option '#{name}' needs a floating-point number but got #{value.inspect}" unless value =~ FLOAT_RE
      value.to_f
    when :string
      value.to_s
    else raise("oops")
    end

  end
end




class String
  def blank?
    self =~ /^\s*$/
  end
end

class NilClass
  def blank?
    true
  end
end


def prepp(o)
  puts "<pre>"
  require 'pp'
  begin
    puts o.pretty_print_inspect.gsub(">","&gt;").gsub("<","&lt;")
  rescue
    pp o
  end
  puts "</pre>"
end