Class: Lisp::Format::Parameters::Argument

Inherits:
Parameter show all
Defined in:
lib/carat/lisp-format.rb

Overview

Represents the V and v parameters, which retrieve their value from the current argument.

Instance Attribute Summary

Attributes inherited from Parameter

#pos

Instance Method Summary collapse

Methods inherited from Parameter

#initialize

Constructor Details

This class inherits a constructor from Lisp::Format::Parameters::Parameter

Instance Method Details

#value(state, default) ⇒ Object

Retrieve this parameters value by getting the value of the current arguments integral value.



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# File 'lib/carat/lisp-format.rb', line 451

def value(state, default)
  begin
    arg = state.next_arg
  rescue => e
    e.pos = @pos if e.respond_to?(:pos) and e.pos == -1
    raise
  end
  if arg.nil?
    default
  elsif arg.respond_to? :to_i
    arg.to_i
  else
    raise ArgumentError.new(@pos),
      'argument not a number or a number string'
  end
end