Class: Pdfrb::Content::Operator::Base

Inherits:

Object

• Object
• Pdfrb::Content::Operator::Base

Defined in:

lib/pdfrb/content/operator.rb

Overview

Base class. Subclasses override name and optionally invoke (read-side effect on the Processor) and serialize (write-side emit).

Direct Known Subclasses

ApplyExtGState, BeginMarkedContent, BeginMarkedContentWithProperties, CharSpacing, ConcatMatrix, CurveTo, CurveToFirstReflected, CurveToLastEqual, DashPattern, FillCMYK, FillGray, FillRGB, Flatness, Font, HorizontalScaling, InvokeXObject, Leading, LineCap, LineJoin, LineTo, LineWidth, MarkedContentPoint, MarkedContentPointWithProperties, MiterLimit, MoveTo, MoveToNextLineShowText, NoArg, NonStrokeAlpha, Rectangle, RenderingIntent, RenderingMode, Rise, SetFillColor, SetFillColorN, SetFillColorSpace, SetSpacingMoveToShowText, SetStrokeColor, SetStrokeColorN, SetStrokeColorSpace, SetTextMatrix, ShowText, ShowTextWithSpacing, StrokeAlpha, StrokeCMYK, StrokeGray, StrokeRGB, TextTranslate, TextTranslateSetLeading, Unknown, WordSpacing

Class Method Summary

• .invoke(_processor, *_operands) ⇒ Object

  Read-side: default no-op.

• .name ⇒ Object
• .register ⇒ Object
• .serialize(serializer, *operands) ⇒ Object

  Default serialize: join operands with spaces and append the operator keyword.

Class Method Details

.invoke(_processor, *_operands) ⇒ Object

Read-side: default no-op. Subclasses override to mutate processor.graphics_state (or do painting / text / etc.).

# File 'lib/pdfrb/content/operator.rb', line 77

def invoke(_processor, *_operands); end

.name ⇒ Object

Raises:

• (NotImplementedError)

# File 'lib/pdfrb/content/operator.rb', line 56

def name
  raise NotImplementedError, "#{self} must define self.name"
end

.register ⇒ Object

# File 'lib/pdfrb/content/operator.rb', line 60

def register
  Operator.register(self.name, self)
end

.serialize(serializer, *operands) ⇒ Object

Default serialize: join operands with spaces and append the operator keyword.

# File 'lib/pdfrb/content/operator.rb', line 66

def serialize(serializer, *operands)
  prefix = operands.empty? ? +"#{name}\n" : +""
  unless operands.empty?
    prefix << operands.map { |o| serializer.serialize(o) }.join(" ")
    prefix << " #{name}\n"
  end
  prefix
end