Class: Prawn::Font::CMap

Inherits:
Object
  • Object
show all
Defined in:
lib/prawn/font/cmap.rb

Overview

:nodoc:

Instance Method Summary collapse

Constructor Details

#initialize ⇒ CMap

Returns a new instance of CMap.



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# File 'lib/prawn/font/cmap.rb', line 13

def initialize
  @codes = {}
end

Instance Method Details

#[](c) ⇒ Object 



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# File 'lib/prawn/font/cmap.rb', line 17

def [](c)
  @codes[c]
end

#[]=(c, v) ⇒ Object 



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# File 'lib/prawn/font/cmap.rb', line 21

def []=(c, v)
  @codes[c] = v
end

#to_s ⇒ Object 



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# File 'lib/prawn/font/cmap.rb', line 25

def to_s
  # TODO: learn what all this means. I just copied the basic structure
  #       from an existing PDF
  # TODO: make this more efficient. The mapping can be specified in
  #       ranges instead of one -> one
  res =  "12 dict begin\n"
  res << "begincmap\n"
  res << "/CIDSystemInfo\n"
  res << "<< /Registry (Adobe)\n"
  res << "/Ordering (UCS)\n"
  res << "/Supplement 0\n"
  res << ">> def\n"
  res << "/CMapName /Adobe-Identity-UCS def\n"
  res << "/CMapType 2 def\n"
  res << "begincodespacerange\n"
  res << "<0000> <ffff>\n"
  res << "endcodespacerange\n"
  res << "9 beginbfchar\n"
  @codes.keys.sort.each do |key|
    val = @codes[key]
    ccode = val.to_s(16)
    ccode = ("0" * (4 - ccode.size)) + ccode
    unicode = key.to_s(16)
    unicode = ("0" * (4 - unicode.size)) + unicode
    res << "<#{ccode}> <#{unicode}>\n"
  end
  res << "endbfchar\n"
  res << "endcmap\n"
  res << "CMapName currentdict /CMap defineresource pop\n"
  res << "end\n"
  res << "end\n"
end