Class: Rake::TaskArguments

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/rake/task_arguments.rb

Overview

TaskArguments manage the arguments passed to a task.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(names, values, parent = nil) ⇒ TaskArguments

Create a TaskArgument object with a list of argument names and a set of associated values. parent is the parent argument object.


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# File 'lib/rake/task_arguments.rb', line 15

def initialize(names, values, parent=nil)
  @names = names
  @parent = parent
  @hash = {}
  @values = values
  names.each_with_index { |name, i|
    next if values[i].nil? || values[i] == ""
    @hash[name.to_sym] = values[i]
  }
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args) ⇒ Object

Returns the value of the given argument via method_missing


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# File 'lib/rake/task_arguments.rb', line 66

def method_missing(sym, *args)
  lookup(sym.to_sym)
end

Instance Attribute Details

#namesObject (readonly)

Argument names


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# File 'lib/rake/task_arguments.rb', line 11

def names
  @names
end

Instance Method Details

#[](index) ⇒ Object

Find an argument value by name or index.


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# File 'lib/rake/task_arguments.rb', line 44

def [](index)
  lookup(index.to_sym)
end

#each(&block) ⇒ Object

Enumerates the arguments and their values


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# File 'lib/rake/task_arguments.rb', line 56

def each(&block)
  @hash.each(&block)
end

#extrasObject

Retrieve the list of values not associated with named arguments


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# File 'lib/rake/task_arguments.rb', line 32

def extras
  @values[@names.length..-1] || []
end

#fetch(*args, &block) ⇒ Object


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# File 'lib/rake/task_arguments.rb', line 93

def fetch(*args, &block)
  @hash.fetch(*args, &block)
end

#has_key?(key) ⇒ Boolean Also known as: key?

Returns true if key is one of the arguments


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# File 'lib/rake/task_arguments.rb', line 88

def has_key?(key)
  @hash.has_key?(key)
end

#inspectObject

:nodoc:


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# File 'lib/rake/task_arguments.rb', line 79

def inspect # :nodoc:
  inspection = @hash.map do |k,v|
    "#{k.to_s}: #{v.to_s}"
  end.join(", ")

  "#<#{self.class} #{inspection}>"
end

#new_scope(names) ⇒ Object

Create a new argument scope using the prerequisite argument names.


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# File 'lib/rake/task_arguments.rb', line 38

def new_scope(names)
  values = names.map { |n| self[n] }
  self.class.new(names, values + extras, self)
end

#to_aObject

Retrieve the complete array of sequential values


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# File 'lib/rake/task_arguments.rb', line 27

def to_a
  @values.dup
end

#to_hashObject

Returns a Hash of arguments and their values


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# File 'lib/rake/task_arguments.rb', line 71

def to_hash
  @hash.dup
end

#to_sObject

:nodoc:


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# File 'lib/rake/task_arguments.rb', line 75

def to_s # :nodoc:
  inspect
end

#values_at(*keys) ⇒ Object

Extracts the argument values at keys


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# File 'lib/rake/task_arguments.rb', line 61

def values_at(*keys)
  keys.map { |k| lookup(k) }
end

#with_defaults(defaults) ⇒ Object

Specify a hash of default values for task arguments. Use the defaults only if there is no specific value for the given argument.


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# File 'lib/rake/task_arguments.rb', line 51

def with_defaults(defaults)
  @hash = defaults.merge(@hash)
end