Class: Property

Inherits:
Value show all
Defined in:
lib/primitive_wrapper.rb

Constant Summary collapse

GOOD_KEY_RGX = 
/\A[a-zA-Z_][a-zA-Z_0-9]*\z/

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Value

#!=, #==, #ensure_valid, #freeze, freeze_raise?, ignore_on_freeze, #inspect, #prim_value, raise_on_freeze, #replace, #to_s, #to_wrapper, #type_of?, #unwrap, #val, #wrapped?, #~

Constructor Details

#initialize(hash = {}) ⇒ Property

Returns a new instance of Property.



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# File 'lib/primitive_wrapper.rb', line 524

def initialize(hash={})
  self.val=(hash)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object 



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# File 'lib/primitive_wrapper.rb', line 584

def method_missing(method, *args, &block)
  flag_good = @good_keys.include? method
  unless flag_good
    unless method[-1]=='='
      if @value.include? method
        rekey!
        flag_good = @good_keys.include? method
      end
    end
  end
  raise "Illegal Block attachment" unless block.nil?
  if flag_good
    raise "*** ArgumentError Exception: wrong number of arguments (given #{args.count}, expected 0)" unless args.empty?
    return @value[method]  
  end
  if method[-1]=='='  # assignment
    key = method[0..-2].to_sym      
    if args.count==1
      if @good_keys.include? key
        @value[key] = args[0]
        return true
      end
      # creating a new key here ... good or bad?
      if self.class.good_key? key
        @good_keys[key]=true
      else
        @hold_keys[key]=true
      end
      return @value[key] = args[0] 
    end
    raise "*** ArgumentError Exception: wrong number of arguments (given #{args.count}, expected 1)"
  else
    # lookup failed ... punt
    super
  end
end

Class Method Details

.bad_key?(idx) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/primitive_wrapper.rb', line 528

def self.bad_key?(idx)
  @badkeys ||= {}
  true==@badkeys[idx]
end

.good_candidate_name?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/primitive_wrapper.rb', line 533

def self.good_candidate_name? name
  name = name.prim_value
  return false unless name.kind_of? Symbol
  tst = GOOD_KEY_RGX.match name
  return false if tst.nil?
  true
end

.good_key?(idx) ⇒ Boolean

syntax and not bad … does not check to see if taken as only instansts can do that

Returns:

  • (Boolean) 


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# File 'lib/primitive_wrapper.rb', line 541

def self.good_key?(idx)  # syntax and not bad ... does not check to see if taken as only instansts can do that
  idx = idx.prim_value
  return false unless good_candidate_name? idx 
  return false if bad_key?(idx)
  true    
end

.reserve_property_names!(*names) ⇒ Object 



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# File 'lib/primitive_wrapper.rb', line 548

def self.reserve_property_names!(*names)
  @badkeys ||= {}
  names = names.first if names.first.kind_of? Array
  names.each do |key|
    next if key[-1]=='!'
    next if key[-1]=='?'
    kw = key[-1]=='=' ? key[0..-2] : key[0..-1]
    md = GOOD_KEY_RGX.match kw
    next if md.nil?  # bad key 
    @badkeys[key]=true
  end
end

Instance Method Details

#[](idx) ⇒ Object 



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# File 'lib/primitive_wrapper.rb', line 633

def [](idx)
  @value[idx]
end

#[]=(idx, val) ⇒ Object 



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# File 'lib/primitive_wrapper.rb', line 637

def []=(idx,val)
  idx = idx.prim_value # in case it is wrapped
  rtn = @value[idx] = val
  # now put key in one of two bins
  if self.class.good_key? idx
    @good_keys[idx]=true
  else
    @hold_keys[idx]=true
  end
  return rtn
end

#deferred?(tst) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/primitive_wrapper.rb', line 677

def deferred?(tst)
  rekey!
  tst = tst.prim_value
  return true if @hold_keys.include? tst
  false
end

#deferred_properties! ⇒ Object 



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# File 'lib/primitive_wrapper.rb', line 665

def deferred_properties!
  rekey!
  @hold_keys.keys  # can't sort bad keys without a ton of work
end

#define_properties!(ary, dflt = "") ⇒ Object 



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# File 'lib/primitive_wrapper.rb', line 684

def define_properties!(ary, dflt="")
  ary.each do |item|
    key = item.prim_value
    raise "*** Property Error: must use Symbol type to define properties" unless key.kind_of? Symbol
    raise "*** Property Error: property #{key.inspect} already defined" if @good_keys.include? key
    raise "*** Property Error: property #{key.inspect} violates naming convention" unless self.class.good_candidate_name? key
    raise "*** Property Error: property #{key.inspect} is reserved" if self.class.bad_key? key
    @good_keys[key]=true
    @value[key]=dflt
  end
end

#defined_properties! ⇒ Object 



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# File 'lib/primitive_wrapper.rb', line 661

def defined_properties!
  rekey!
  @good_keys.keys.sort
end

#import_hash!(hash) ⇒ Object 



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# File 'lib/primitive_wrapper.rb', line 649

def import_hash!(hash)
  hash.each_pair do |key,val|
    self[key]=val
  end 
end

#property?(tst) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/primitive_wrapper.rb', line 670

def property?(tst)
  rekey!
  tst = tst.prim_value
  return true if @good_keys.include? tst
  false
end

#rekey! ⇒ Object 



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# File 'lib/primitive_wrapper.rb', line 571

def rekey!
  @good_keys = {}  # these keys can be properties
  @hold_keys  = {} # these keys can't
  @value.each_pair do |pkey,val|
    key = pkey.prim_value
    if self.class.good_key? key
      @good_keys[key.prim_value]=true
    else
      @hold_keys[key.prim_value]=true
    end
  end
end

#split! ⇒ Object 



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# File 'lib/primitive_wrapper.rb', line 621

def split!
  good = {}
  bad = {}
  @good_keys.each_pair do |key,val|    
    good[key] = @value[key]
  end
  @hold_keys.each_pair do |key,val|
    bad[key] = @value[key]
  end
  return [good, bad]
end

#val=(hash) ⇒ Object

assign replacement hash



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# File 'lib/primitive_wrapper.rb', line 564

def val=(hash)
  ensure_valid(hash)
  hash = hash.prim_value
  @value = hash    # keep this as prime as possible
  rekey!
end

#valid_type(prm) ⇒ Object 



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# File 'lib/primitive_wrapper.rb', line 655

def valid_type(prm)
  return true if prm.kind_of? Hash
  return true if prm.kind_of? Property
  false
end