Module: Dynamic::ClassMethods

Included in:
Dynamic
Defined in:
lib/ext/dynamic.rb

Overview

:nodoc:

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object 



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# File 'lib/ext/dynamic.rb', line 73

def method_missing(name, *args)
  if match = /=\Z/.match(name.to_s)    # setter?
    raise ArgumentError, "invalid setter call"  unless args.size == 1
    self[match.pre_match.intern] = args.first
  else
    raise ArgumentError, "invalid getter call"  unless args.empty?
    self[name]
  end
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/ext/dynamic.rb', line 47

def [](key)
  variables[key]
end

#[]=(key, value) ⇒ Object 



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# File 'lib/ext/dynamic.rb', line 51

def []=(key, value)
  variables[key] = value
end

#here! ⇒ Object 



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# File 'lib/ext/dynamic.rb', line 17

def here!
  Thread.current[:DYNAMIC] = Hash.new { |hash, key|
    raise NameError, "no such dynamic variable: #{key}"
  }.update Thread.main[:DYNAMIC]
end

#let(bindings, &block) ⇒ Object 



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# File 'lib/ext/dynamic.rb', line 62

def let(bindings, &block)
  save = {}
  bindings.to_hash.collect { |key, value|
    save[key] = self[key]
    self[key] = value
  }
  block.call
ensure
  variables.update save
end

#undefine(*keys) ⇒ Object 



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# File 'lib/ext/dynamic.rb', line 55

def undefine(*keys)
  keys.each { |key|
    self[key]
    variables.delete key
  }
end

#variable(definition) ⇒ Object 



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# File 'lib/ext/dynamic.rb', line 27

def variable(definition)
  case definition
  when Symbol
    if variables.has_key? definition
      raise NameError, "dynamic variable `#{definition}' already exists"
    end
    variables[definition] = nil
  when Hash
    definition.each { |key, value|
      if variables.has_key? key
        raise NameError, "dynamic variable `#{key}' already exists"
      end
      variables[key] = value
    }
  else
    raise ArgumentError,
    "can't create a new dynamic variable from #{definition.class}"
  end
end

#variables ⇒ Object 



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# File 'lib/ext/dynamic.rb', line 23

def variables
  Thread.current[:DYNAMIC] or here!
end