Module: Pdfrb::Content::Operator

Defined in:
lib/pdfrb/content/operator.rb,
lib/pdfrb/content/parser.rb,
lib/pdfrb/content/operators/path.rb,
lib/pdfrb/content/operators/color.rb,
lib/pdfrb/content/operators/general.rb,
lib/pdfrb/content/operators/clipping.rb,
lib/pdfrb/content/operators/painting.rb,
lib/pdfrb/content/operators/text_state.rb,
lib/pdfrb/content/operators/text_showing.rb,
lib/pdfrb/content/operators/marked_content.rb,
lib/pdfrb/content/operators/text_positioning.rb,
lib/pdfrb/content/operators/graphics_state_params.rb

Overview

Operator catalogue. Each PDF content operator (q, m, Tj, ...) is implemented by a subclass of Operator::Base that registers itself in REGISTRY at file load.

Adding a new operator = adding one subclass + register. No switch edits (open/closed). Mirrors the postscript gem's Model::Operators pattern.

Defined Under Namespace

Classes: ApplyExtGState, Base, BeginMarkedContent, BeginMarkedContentWithProperties, BeginText, CharSpacing, ClipEvenOdd, ClipNonZero, CloseAndStroke, CloseFillStrokeEvenOdd, CloseFillStrokeNonZero, ClosePath, ConcatMatrix, CurveTo, CurveToFirstReflected, CurveToLastEqual, DashPattern, EndMarkedContent, EndPath, EndText, FillCMYK, FillDeprecatedAlias, FillEvenOdd, FillGray, FillNonZero, FillRGB, FillStrokeEvenOdd, FillStrokeNonZero, Flatness, Font, HorizontalScaling, InvokeXObject, Leading, LineCap, LineJoin, LineTo, LineWidth, MarkedContentPoint, MarkedContentPointWithProperties, MiterLimit, MoveTo, MoveToNextLineShowText, NextLine, NoArg, NonStrokeAlpha, Rectangle, RenderingIntent, RenderingMode, RestoreGraphicsState, Rise, SaveGraphicsState, SetFillColor, SetFillColorN, SetFillColorSpace, SetSpacingMoveToShowText, SetStrokeColor, SetStrokeColorN, SetStrokeColorSpace, SetTextMatrix, ShowText, ShowTextWithSpacing, Stroke, StrokeAlpha, StrokeCMYK, StrokeGray, StrokeRGB, TextTranslate, TextTranslateSetLeading, Unknown, WordSpacing

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.registry ⇒ Object (readonly)

Returns the value of attribute registry.



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# File 'lib/pdfrb/content/operator.rb', line 16

def registry
  @registry
end

Class Method Details

.[](name) ⇒ Object 



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# File 'lib/pdfrb/content/operator.rb', line 22

def [](name)
  key = name.to_s
  result = @registry[key]
  return result if result

  # Lazy-load on miss: trigger eager_load! which populates
  # the registry, then retry.
  eager_load! unless @eager_loaded
  @registry[key]
end

.eager_load! ⇒ Object

Force-load all operator implementations so register calls fire and populate the registry. Idempotent.



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# File 'lib/pdfrb/content/operator.rb', line 39

def eager_load!
  return if @eager_loaded

  Pdfrb::Content::Operators.constants.each do |c|
    Pdfrb::Content::Operators.const_get(c)
  rescue NameError
    # Skip modules that don't resolve.
  end
  @eager_loaded = true
end

.names ⇒ Object 



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# File 'lib/pdfrb/content/operator.rb', line 33

def names
  @registry.keys
end

.register(name, klass) ⇒ Object 



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# File 'lib/pdfrb/content/operator.rb', line 18

def register(name, klass)
  @registry[name.to_s] = klass
end