Class: Erlang::ETF::Float

Inherits:
Object
  • Object
show all
Includes:
Term
Defined in:
lib/erlang/etf/float.rb

Overview

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99 Float String

A float is stored in string format. the format used in sprintf to format the float is "%.20e" (there are more bytes allocated than necessary). To unpack the float use sscanf with format "%lf".

This term is used in minor version 0 of the external format; it has been superseded by NEW_FLOAT_EXT.

(see FLOAT_EXT)

Constant Summary

Constants included from Term

Term::ATOM_CACHE_REF, Term::ATOM_EXT, Term::ATOM_INTERNAL_REF2, Term::ATOM_INTERNAL_REF3, Term::ATOM_UTF8_EXT, Term::BINARY_ENCODING, Term::BINARY_EXT, Term::BINARY_INTERNAL_REF, Term::BIT_BINARY_EXT, Term::BIT_BINARY_INTERNAL_REF, Term::COMPRESSED, Term::DIST_HEADER, Term::DOUBLE, Term::DOUBLEBE, Term::DOUBLELE, Term::ERLANG_MAGIC_BYTE, Term::EXPORT_EXT, Term::FLOAT_EXT, Term::FUN_EXT, Term::INT128, Term::INT128BE, Term::INT128LE, Term::INT16, Term::INT16BE, Term::INT16LE, Term::INT32, Term::INT32BE, Term::INT32LE, Term::INT64, Term::INT64BE, Term::INT64LE, Term::INT8, Term::INTEGER_EXT, Term::LARGE_BIG_EXT, Term::LARGE_TUPLE_EXT, Term::LIST_EXT, Term::MAP_EXT, Term::NEW_FLOAT_EXT, Term::NEW_FUN_EXT, Term::NEW_REFERENCE_EXT, Term::NIL_EXT, Term::PID_EXT, Term::PORT_EXT, Term::REFERENCE_EXT, Term::SINGLE, Term::SINGLEBE, Term::SINGLELE, Term::SMALL_ATOM_EXT, Term::SMALL_ATOM_UTF8_EXT, Term::SMALL_BIG_EXT, Term::SMALL_INTEGER_EXT, Term::SMALL_TUPLE_EXT, Term::STRING_EXT, Term::UINT128, Term::UINT128BE, Term::UINT128LE, Term::UINT16, Term::UINT16BE, Term::UINT16LE, Term::UINT32, Term::UINT32BE, Term::UINT32LE, Term::UINT64, Term::UINT64BE, Term::UINT64LE, Term::UINT8

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Term

#<=>, binary_encoding, #eql?, #erlang_external_type, #hash, included, #to_erlang_etf

Constructor Details

#initialize(term, float_string = nil) ⇒ Float

Returns a new instance of Float.

Raises:

  • (ArgumentError) 


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# File 'lib/erlang/etf/float.rb', line 39

def initialize(term, float_string = nil)
  raise ArgumentError, "term must be of type Erlang::Float" if not Erlang.is_float(term) or not term.old
  @term         = term
  @float_string = float_string
end

Class Method Details

.[](term, float_string = nil) ⇒ Object 



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# File 'lib/erlang/etf/float.rb', line 26

def [](term, float_string = nil)
  return term if term.kind_of?(Erlang::ETF::Term)
  term = Erlang.from(term)
  return new(term, float_string)
end

.erlang_load(buffer) ⇒ Object 



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# File 'lib/erlang/etf/float.rb', line 32

def erlang_load(buffer)
  float_string = buffer.read(31)
  term = Erlang::Float[float_string.byteslice(0, float_string.index("\0")), old: true]
  return new(term, float_string)
end

Instance Method Details

#erlang_dump(buffer = ::String.new.force_encoding(BINARY_ENCODING)) ⇒ Object 



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# File 'lib/erlang/etf/float.rb', line 45

def erlang_dump(buffer = ::String.new.force_encoding(BINARY_ENCODING))
  buffer << FLOAT_EXT
  buffer << (@float_string || to_float_string)
  return buffer
end

#inspect ⇒ Object 



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# File 'lib/erlang/etf/float.rb', line 51

def inspect
  if @float_string.nil?
    return "#{self.class}[#{@term.inspect}]"
  else
    return "#{self.class}[#{@term.inspect}, #{@float_string.inspect}]"
  end
end