Class: Racket::Misc::VT

Inherits:
Object
  • Object
show all
Defined in:
lib/racket/misc/vt.rb

Overview

arbitrarily sized values, followed by a “rest” field.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ VT

Create a new VT which consists of a null terminated string followed by some number of arbitrarily sized values, as specified by args



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# File 'lib/racket/misc/vt.rb', line 44

def initialize(*args)
  @lengths = args
  @types = []
  @value = ""
end

Instance Attribute Details

#rest ⇒ Object

everything else



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# File 'lib/racket/misc/vt.rb', line 39

def rest
  @rest
end

#types ⇒ Object

the array of types for this VT object



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# File 'lib/racket/misc/vt.rb', line 37

def types
  @types
end

#value ⇒ Object

the value for this VT object



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# File 'lib/racket/misc/vt.rb', line 35

def value
  @value
end

Instance Method Details

#decode(data) ⇒ Object

Given data, return the value and an array of the types as dictated by this instance



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# File 'lib/racket/misc/vt.rb', line 52

def decode(data)
  null = data.index(0x00)
  value = data.unpack("a#{null}")[0]
  data = data.slice(null+1, data.length)

  n = 0
  types = []
  @lengths.each do |l|
    types[n] = data.unpack("#{punpack_string(l)}")[0]
    data = data.slice(l, data.length)
    n += 1
  end

  [value, types, data]
end

#decode!(data) ⇒ Object

Given data, set the value and types array accordingly



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# File 'lib/racket/misc/vt.rb', line 70

def decode!(data)
  @value, @types, @rest = self.decode(data)
end

#encode ⇒ Object

Return a string suitable for use elsewhere



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# File 'lib/racket/misc/vt.rb', line 75

def encode
  s = "#{@value}\000"

  n = 0
  @lengths.each do |l|
    s << [@types[n]].pack("#{punpack_string(l)}")
    n += 1
  end
  s
end

#to_s ⇒ Object 



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# File 'lib/racket/misc/vt.rb', line 86

def to_s
  encode
end

#to_str ⇒ Object 



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# File 'lib/racket/misc/vt.rb', line 90

def to_str
  encode
end