Class: HexaPDF::Content::Operator::BaseOperator

Inherits:

Object

• Object
• HexaPDF::Content::Operator::BaseOperator

Defined in:

lib/hexapdf/content/operator.rb

Overview

A base class for operator implementations.

A default implementation for the #serialize method is provided. However, for performance reasons each operator should provide a custom #serialize method.

Direct Known Subclasses

AppendRectangle, ConcatenateMatrix, CurveTo, CurveToNoFirstControlPoint, CurveToNoSecondControlPoint, InlineImage, LineTo, MoveText, MoveTextAndSetLeading, MoveTextNextLineAndShowText, MoveTo, NoArgumentOperator, SetDeviceCMYKNonStrokingColor, SetDeviceCMYKStrokingColor, SetDeviceRGBNonStrokingColor, SetDeviceRGBStrokingColor, SetFontAndSize, SetGraphicsStateParameters, SetLineDashPattern, SetNonStrokingColor, SetNonStrokingColorSpace, SetRenderingIntent, SetSpacingMoveTextNextLineAndShowText, SetStrokingColor, SetStrokingColorSpace, SetTextMatrix, ShowText, ShowTextWithPositioning, SingleNumericArgumentOperator

Instance Attribute Summary

• #name ⇒ Object readonly

  The name of the operator.

Instance Method Summary

• #initialize(name) ⇒ BaseOperator constructor

  Initialize the operator called name.

• #invoke ⇒ Object

  Invokes the operator so that it performs its job.

• #serialize(serializer, *operands) ⇒ Object

  Returns the string representation of the operator, i.e.

Constructor Details

#initialize(name) ⇒ BaseOperator

Initialize the operator called name.

# File 'lib/hexapdf/content/operator.rb', line 89

def initialize(name)
  @name = name.freeze
end

Instance Attribute Details

#name ⇒ Object (readonly)

The name of the operator.

# File 'lib/hexapdf/content/operator.rb', line 86

def name
  @name
end

Instance Method Details

#invoke ⇒ Object

Invokes the operator so that it performs its job.

This base version does nothing!

# File 'lib/hexapdf/content/operator.rb', line 96

def invoke(*)
end

#serialize(serializer, *operands) ⇒ Object

Returns the string representation of the operator, i.e.

operand1 operand2 operand3 name

# File 'lib/hexapdf/content/operator.rb', line 102

def serialize(serializer, *operands)
  result = ''.b
  operands.each do |operand|
    result << serializer.serialize(operand) << " ".freeze
  end
  result << name << "\n".freeze
end