Class: BinData::Base
- Inherits:
-
Object
- Object
- BinData::Base
- Extended by:
- AcceptedParametersPlugin
- Includes:
- CheckOrAdjustOffsetPlugin, Framework, RegisterNamePlugin
- Defined in:
- lib/bindata/base.rb,
lib/bindata/struct.rb,
lib/bindata/warnings.rb
Overview
This is the abstract base class for all data objects.
Direct Known Subclasses
Array, BasePrimitive, Buffer, Choice, ResumeByteAlignment, Struct
Instance Attribute Summary collapse
-
#parent ⇒ Object
readonly
Returns the value of attribute parent.
Class Method Summary collapse
-
.arg_processor(name = nil) ⇒ Object
The arg processor for this class.
-
.bindata_name ⇒ Object
The name of this class as used by Records, Arrays etc.
-
.read(io, *args) ⇒ Object
Instantiates this class and reads from
io
, returning the newly created data object. -
.register_subclasses ⇒ Object
Registers all subclasses of this class for use.
-
.unregister_self ⇒ Object
Call this method if this class is abstract and not to be used.
Instance Method Summary collapse
-
#==(other) ⇒ Object
:nodoc:.
-
#=~(other) ⇒ Object
Override and delegate =~ as it is defined in Object.
-
#abs_offset ⇒ Object
Returns the offset (in bytes) of this object with respect to its most distant ancestor.
-
#clear ⇒ Object
Resets the internal state to that of a newly created object.
-
#debug_name ⇒ Object
Returns a user friendly name of this object for debugging purposes.
-
#eval_parameter(key, overrides = nil) ⇒ Object
Returns the result of evaluating the parameter identified by
key
. -
#get_parameter(key) ⇒ Object
Returns the parameter referenced by
key
. -
#has_parameter?(key) ⇒ Boolean
Returns whether
key
exists in theparameters
hash. - #initialize_instance(*args) ⇒ Object
- #initialize_with_warning(*args) ⇒ Object (also: #initialize)
-
#inspect ⇒ Object
Return a human readable representation of this data object.
-
#lazy_evaluator ⇒ Object
Returns a lazy evaluator for this object.
-
#new(value = nil, parent = nil) ⇒ Object
Creates a new data object based on this instance.
-
#num_bytes ⇒ Object
Returns the number of bytes it will take to write this data object.
-
#offset ⇒ Object
#offset has been renamed to #abs_offset.
-
#pretty_print(pp) ⇒ Object
Work with Ruby’s pretty-printer library.
-
#read(io) ⇒ Object
Reads data into this data object.
-
#rel_offset ⇒ Object
Returns the offset (in bytes) of this object with respect to its parent.
-
#safe_respond_to?(symbol, include_private = false) ⇒ Boolean
A version of
respond_to?
used by the lazy evaluator. -
#to_binary_s ⇒ Object
Returns the string representation of this data object.
-
#to_hex ⇒ Object
Returns the hexadecimal string representation of this data object.
-
#to_s ⇒ Object
Return a string representing this data object.
-
#write(io) ⇒ Object
Writes the value for this data object to
io
.
Methods included from AcceptedParametersPlugin
accepted_parameters, default_parameters, mandatory_parameters, mutually_exclusive_parameters, optional_parameters
Methods included from RegisterNamePlugin
included, #initialize_shared_instance
Methods included from CheckOrAdjustOffsetPlugin
included, #initialize_shared_instance
Methods included from Framework
#assign, #clear?, #debug_name_of, #offset_of, #snapshot
Instance Attribute Details
#parent ⇒ Object
Returns the value of attribute parent.
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# File 'lib/bindata/base.rb', line 87 def parent @parent end |
Class Method Details
.arg_processor(name = nil) ⇒ Object
The arg processor for this class.
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# File 'lib/bindata/base.rb', line 28 def arg_processor(name = nil) if name @arg_processor = "#{name}_arg_processor".gsub(/(?:^|_)(.)/) { $1.upcase }.to_sym elsif @arg_processor.is_a? Symbol @arg_processor = BinData::const_get(@arg_processor).new elsif @arg_processor.nil? @arg_processor = superclass.arg_processor else @arg_processor end end |
.bindata_name ⇒ Object
The name of this class as used by Records, Arrays etc.
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# File 'lib/bindata/base.rb', line 41 def bindata_name RegisteredClasses.underscore_name(self.name) end |
.read(io, *args) ⇒ Object
Instantiates this class and reads from io
, returning the newly created data object. args
will be used when instantiating.
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# File 'lib/bindata/base.rb', line 21 def read(io, *args) obj = self.new(*args) obj.read(io) obj end |
.register_subclasses ⇒ Object
Registers all subclasses of this class for use
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# File 'lib/bindata/base.rb', line 51 def register_subclasses #:nodoc: define_singleton_method(:inherited) do |subclass| RegisteredClasses.register(subclass.name, subclass) register_subclasses end end |
.unregister_self ⇒ Object
Call this method if this class is abstract and not to be used.
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# File 'lib/bindata/base.rb', line 46 def unregister_self RegisteredClasses.unregister(name) end |
Instance Method Details
#==(other) ⇒ Object
:nodoc:
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# File 'lib/bindata/base.rb', line 238 def ==(other) #:nodoc: # double dispatch other == snapshot end |
#=~(other) ⇒ Object
Override and delegate =~ as it is defined in Object.
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# File 'lib/bindata/base.rb', line 206 def =~(other) snapshot =~ other end |
#abs_offset ⇒ Object
Returns the offset (in bytes) of this object with respect to its most distant ancestor.
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# File 'lib/bindata/base.rb', line 221 def abs_offset if @parent @parent.abs_offset + @parent.offset_of(self) else 0 end end |
#clear ⇒ Object
Resets the internal state to that of a newly created object.
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# File 'lib/bindata/base.rb', line 136 def clear initialize_instance end |
#debug_name ⇒ Object
Returns a user friendly name of this object for debugging purposes.
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# File 'lib/bindata/base.rb', line 211 def debug_name if @parent @parent.debug_name_of(self) else "obj" end end |
#eval_parameter(key, overrides = nil) ⇒ Object
Returns the result of evaluating the parameter identified by key
.
overrides
is an optional parameters
like hash that allow the parameters given at object construction to be overridden.
Returns nil if key
does not refer to any parameter.
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# File 'lib/bindata/base.rb', line 109 def eval_parameter(key, overrides = nil) value = get_parameter(key) if value.is_a?(Symbol) or value.respond_to?(:arity) lazy_evaluator.lazy_eval(value, overrides) else value end end |
#get_parameter(key) ⇒ Object
Returns the parameter referenced by key
. Use this method if you are sure the parameter is not to be evaluated. You most likely want #eval_parameter.
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# File 'lib/bindata/base.rb', line 126 def get_parameter(key) @params[key] end |
#has_parameter?(key) ⇒ Boolean
Returns whether key
exists in the parameters
hash.
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# File 'lib/bindata/base.rb', line 131 def has_parameter?(key) @params.has_parameter?(key) end |
#initialize_instance(*args) ⇒ Object
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# File 'lib/bindata/warnings.rb', line 26 def initialize_instance(*args) unless args.empty? fail "#{caller[0]} remove the call to super in #initialize_instance" end end |
#initialize_with_warning(*args) ⇒ Object Also known as: initialize
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# File 'lib/bindata/warnings.rb', line 13 def initialize_with_warning(*args) owner = method(:initialize).owner if owner != BinData::Base msg = "Don't override #initialize on #{owner}." if %w(BinData::Base BinData::BasePrimitive).include? self.class.superclass.name msg += "\nrename #initialize to #initialize_instance." end fail msg end initialize_without_warning(*args) end |
#inspect ⇒ Object
Return a human readable representation of this data object.
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# File 'lib/bindata/base.rb', line 191 def inspect snapshot.inspect end |
#lazy_evaluator ⇒ Object
Returns a lazy evaluator for this object.
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# File 'lib/bindata/base.rb', line 119 def lazy_evaluator #:nodoc: @lazy ||= LazyEvaluator.new(self) end |
#new(value = nil, parent = nil) ⇒ Object
Creates a new data object based on this instance.
All parameters will be be duplicated. Use this method when creating multiple objects with the same parameters.
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# File 'lib/bindata/base.rb', line 94 def new(value = nil, parent = nil) obj = clone obj.parent = parent if parent obj.initialize_instance obj.assign(value) if value obj end |
#num_bytes ⇒ Object
Returns the number of bytes it will take to write this data object.
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# File 'lib/bindata/base.rb', line 173 def num_bytes do_num_bytes.ceil end |
#offset ⇒ Object
#offset has been renamed to #abs_offset. Eventually #rel_offset will be renamed to #offset.
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# File 'lib/bindata/warnings.rb', line 34 def offset warn "#offset is deprecated in #{debug_name}. Use #abs_offset instead" abs_offset end |
#pretty_print(pp) ⇒ Object
Work with Ruby’s pretty-printer library.
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# File 'lib/bindata/base.rb', line 201 def pretty_print(pp) #:nodoc: pp.pp(snapshot) end |
#read(io) ⇒ Object
Reads data into this data object.
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# File 'lib/bindata/base.rb', line 141 def read(io) io = BinData::IO::Read.new(io) unless BinData::IO::Read === io @in_read = true clear do_read(io) @in_read = false self end |
#rel_offset ⇒ Object
Returns the offset (in bytes) of this object with respect to its parent.
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# File 'lib/bindata/base.rb', line 230 def rel_offset if @parent @parent.offset_of(self) else 0 end end |
#safe_respond_to?(symbol, include_private = false) ⇒ Boolean
A version of respond_to?
used by the lazy evaluator. It doesn’t reinvoke the evaluator so as to avoid infinite evaluation loops.
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# File 'lib/bindata/base.rb', line 245 def safe_respond_to?(symbol, include_private = false) #:nodoc: respond_to?(symbol, include_private) end |
#to_binary_s ⇒ Object
Returns the string representation of this data object.
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# File 'lib/bindata/base.rb', line 178 def to_binary_s io = BinData::IO.create_string_io write(io) io.rewind io.read end |
#to_hex ⇒ Object
Returns the hexadecimal string representation of this data object.
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# File 'lib/bindata/base.rb', line 186 def to_hex to_binary_s.unpack('H*')[0] end |
#to_s ⇒ Object
Return a string representing this data object.
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# File 'lib/bindata/base.rb', line 196 def to_s snapshot.to_s end |