Class: ParseArgs::Parser

Inherits:
Object show all
Includes:
Util
Defined in:
lib/parseargs.rb,
lib/parseargs-0.3.0.rb

Defined Under Namespace

Classes: Argument, Keyword

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Util

append_features

Constructor Details

#initialize(opts = {}, &b) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/parseargs.rb', line 166

def initialize(opts = {}, &b)
#--{{{
  @required_arguments = []
  @optional_arguments = []
  @required_keywords = []
  @optional_keywords = []
  opts.each{|k,v| send k, v}
  instance_eval &b
#--}}}
end

Instance Attribute Details

#receiver ⇒ Object

class Keyword



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# File 'lib/parseargs.rb', line 165

def receiver
  @receiver
end

Instance Method Details

#define(what, list, required, *descs) ⇒ Object

–}}}



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# File 'lib/parseargs.rb', line 176

def define(what, list, required, *descs)
#--{{{
  unless descs.empty?
    metadata = descs.size >= 2 && Hash === descs.last ? descs.pop : {}
    descs.flatten!
    mdefault = get_kw('default', metadata)
    descs.each do |desc|
      names, default = Hash === desc ? desc.to_a.first : [desc, mdefault]
      req = default ? false : required
      names = [ names ] unless names.respond_to? :each
      names.each do |name|
        list << what::new(name, metadata.merge('required' => req,'default' => default)) 
      end
    end
  end
  list
#--}}}
end

#define_arguments(list, required, *descs) ⇒ Object

–}}}



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# File 'lib/parseargs.rb', line 194

def define_arguments(list, required, *descs)
#--{{{
  define Argument, list, required, *descs
#--}}}
end

#define_keywords(list, required, *descs) ⇒ Object 



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# File 'lib/parseargs.rb', line 239

def define_keywords(list, required, *descs)
#--{{{
  define Keyword, list, required, *descs
#--}}}
end

#extract_kw(kw, kws) ⇒ Object

–}}}



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# File 'lib/parseargs.rb', line 349

def extract_kw kw, kws 
#--{{{
  k = kw.name
  return [k, kws[k]] if kws.has_key? k
  k = "#{ k }" 
  return [k, kws[k]] if kws.has_key? k
  k = k.intern 
  return [k, kws[k]] if kws.has_key? k
  return [nil, nil]
#--}}}
end

#optional_arguments(*descs) ⇒ Object Also known as: optional_argument, opt_arguments, opt_argument, opt_args, opt_arg, o_args, o_arg, oas, oa 



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# File 'lib/parseargs.rb', line 221

def optional_arguments(*descs)
#--{{{
  if descs.empty?
    @optional_arguments
  else
    define_arguments(@optional_arguments, false, *descs)
  end
#--}}}
end

#optional_keywords(*descs) ⇒ Object Also known as: optional_keyword, opt_keywords, opt_keyword, opt_kws, opt_kw, o_kws, o_kw, okws, okw 



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# File 'lib/parseargs.rb', line 264

def optional_keywords(*descs)
#--{{{
  if descs.empty?
    @optional_keywords
  else
    define_keywords(@optional_keywords, false, *descs)
  end
#--}}}
end

#parse(arg) ⇒ Object

TODO - thinks about *args signature??



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# File 'lib/parseargs.rb', line 285

def parse arg 
#--{{{
  enumerable, receiver =
    if Hash === arg
      a = arg.to_a
      pair = a.shift
      unless a.empty?
        raise ArgumentError, "wrong number of arguments(#{ a.size + 1 } for 1"
      end
      pair
    else
      [arg, Receiver::new]
    end

  p_args = enumerable.to_enum.map

  n = p_args.size

  @required_arguments.each do |arg|
    if p_args.empty? 
      raise ArgumentNotGiven, "<#{ arg.name }>"
    end
    p_arg = p_args.shift
    arg.value = p_arg
    receiver_set receiver, arg.name, arg.value
  end

  @optional_arguments.each do |arg|
    p_arg = p_args.empty? ? arg.default : p_args.shift
    arg.value = p_arg
    receiver_set receiver, arg.name, arg.value
  end

  if receiver.respond_to? "arguments="
    receiver.arguments = @required_arguments + @optional_arguments
  end

  p_kws = Hash === p_args.first ? p_args.shift : {}

  @required_keywords.each do |kw|
    p_kw, p_arg = extract_kw kw, p_kws
    raise KeywordNotGiven, "<#{ kw.name }>" if p_kw.nil?
    kw.value = p_arg
    receiver_set receiver, kw.name, kw.value
  end

  @optional_keywords.each do |kw|
    p_kw, p_arg = extract_kw kw, p_kws
    p_arg = p_kw ? p_arg : kw.default
    kw.value = p_arg
    receiver_set receiver, kw.name, kw.value
  end

  if receiver.respond_to? "keywords="
    receiver.keywords = @required_keywords + @optional_keywords
  end

  unless p_args.empty?
    raise ArgumentError, "wrong number of arguments(#{ n } for #{ n - p_args.size })"
  end

  receiver
#--}}}
end

#receiver_set(receiver, name, value) ⇒ Object

–}}}



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# File 'lib/parseargs.rb', line 360

def receiver_set receiver, name, value
#--{{{
  begin
    receiver.send "[]=", name, value
  rescue NameError
    begin
      receiver.send "#{ name }=", value
    rescue NameError
      receiver.send "#{ name }", value
    end
  end
#--}}}
end

#required_arguments(*descs) ⇒ Object Also known as: required_argument, req_arguments, req_argument, req_args, req_arg, r_args, r_arg, args, arg, arguments, argument, ras, ra

–}}}



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# File 'lib/parseargs.rb', line 199

def required_arguments(*descs)
#--{{{
  if descs.empty?
    @required_arguments
  else
    define_arguments(@required_arguments, true, *descs)
  end
#--}}}
end

#required_keywords(*descs) ⇒ Object Also known as: required_keyword, req_keywords, req_keyword, req_kws, req_kw, r_kws, r_kw, kws, kw, keywords, keyword

–}}}



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# File 'lib/parseargs.rb', line 244

def required_keywords(*descs)
#--{{{
  if descs.empty?
    @required_keywords
  else
    define_keywords(@required_keywords, true, *descs)
  end
#--}}}
end