Module: IOStruct

Extended by:
HashFmt, PackFmt
Defined in:
lib/iostruct.rb,
lib/iostruct/version.rb,
lib/iostruct/hash_fmt.rb,
lib/iostruct/pack_fmt.rb

Defined Under Namespace

Modules: ClassMethods, DecInspect, HashFmt, HexInspect, InspectBase, InstanceMethods, NestedInstanceMethods, PackFmt Classes: FieldInfo

Constant Summary collapse

VERSION = 
"0.6.0"

Constants included from PackFmt

PackFmt::FMTSPEC

Constants included from HashFmt

HashFmt::KNOWN_FIELD_TYPES, HashFmt::KNOWN_FIELD_TYPES_REVERSED

Class Method Summary collapse

Methods included from HashFmt

get_type_size

Class Method Details

.auto_names(fields, _size) ⇒ Object

self.new



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# File 'lib/iostruct.rb', line 48

def self.auto_names(fields, _size)
  names = []
  offset = 0
  fields.each do |f|
    names << sprintf("f%x", offset).to_sym
    offset += f.size
  end
  names
end

.new(fmt = nil, *names, inspect: :hex, inspect_name_override: nil, struct_name: nil, **kwargs) ⇒ Object

rubocop:enable Lint/StructNewOverride



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# File 'lib/iostruct.rb', line 14

def self.new fmt = nil, *names, inspect: :hex, inspect_name_override: nil, struct_name: nil, **kwargs
  struct_name ||= inspect_name_override # XXX inspect_name_override is deprecated
  if fmt
    renames = kwargs
    finfos, size = parse_pack_format(fmt, names)
    names = auto_names(finfos, size) if names.empty?
    names.map! { |n| renames[n] || n } if renames.any?
  elsif kwargs[:fields]
    fmt, names, finfos, size = parse_hash_format(name: struct_name, **kwargs)
  else
    raise "IOStruct: no fmt and no :fields specified"
  end

  # if first argument to Struct.new() is a string - it creates a named struct in the Struct:: namespace
  # convert all just for the case
  names = names.map(&:to_sym)

  Struct.new( *names ) do
    const_set 'FIELDS', names.zip(finfos).to_h
    const_set 'FORMAT', fmt
    const_set 'SIZE', size
    extend ClassMethods
    include InstanceMethods
    include NestedInstanceMethods if finfos.any?(&:fmt)
    if inspect == :hex
      include HexInspect
    else
      include DecInspect
    end
    define_singleton_method(:to_s) { struct_name } if struct_name
    define_singleton_method(:name) { struct_name } if struct_name
  end
end