Class: PDF::Reader::CMap

Inherits:
Object
  • Object
show all
Defined in:
lib/pdf/reader/cmap.rb

Overview

wraps a string containing a PDF CMap and provides convenience methods for extracting various useful information.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data) ⇒ CMap

Returns a new instance of CMap.



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# File 'lib/pdf/reader/cmap.rb', line 37

def initialize(data)
  @map = {}
  process_data(data)
end

Instance Attribute Details

#map ⇒ Object (readonly)

:nodoc:



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# File 'lib/pdf/reader/cmap.rb', line 35

def map
  @map
end

Instance Method Details

#decode(c) ⇒ Object

Convert a glyph code into one or more Codepoints.

Returns an array of Fixnums.



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# File 'lib/pdf/reader/cmap.rb', line 73

def decode(c)
  # TODO: implement the conversion
  return c unless c.class == Fixnum
  @map[c]
end

#process_data(data) ⇒ Object 



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# File 'lib/pdf/reader/cmap.rb', line 42

def process_data(data)
  mode = nil
  instructions = ""

  data.each_line do |l|
    if l.include?("beginbfchar")
      mode = :char
    elsif l.include?("endbfchar")
      process_bfchar_instructions(instructions)
      instructions = ""
      mode = nil
    elsif l.include?("beginbfrange")
      mode = :range
    elsif l.include?("endbfrange")
      process_bfrange_instructions(instructions)
      instructions = ""
      mode = nil
    elsif mode == :char || mode == :range
      instructions << l
    end
  end
end

#size ⇒ Object 



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# File 'lib/pdf/reader/cmap.rb', line 65

def size
  @map.size
end