Class: PDF::Reader::GlyphHash

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

Overview

A Hash-like object that can convert glyph names into a unicode codepoint. The mapping is read from a data file on disk the first time it’s needed.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ GlyphHash

:nodoc:



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# File 'lib/pdf/reader/glyph_hash.rb', line 33

def initialize
  # only parse the glyph list once, and cache the results (for performance)
  @adobe = @@cache ||= load_adobe_glyph_mapping
end

Instance Method Details

#[](name) ⇒ Object

attempt to convert a PDF Name to a unicode codepoint. Returns nil if no conversion is possible.

h = GlyphHash.new

h[:A]
=> 65

h[:Euro]
=> 8364

h[:G30]
=> 48

h[:34]
=> 34



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# File 'lib/pdf/reader/glyph_hash.rb', line 55

def [](name)
  return nil unless name.is_a?(Symbol)

  name = name.to_s.gsub('_', '').intern
  str = name.to_s

  if @adobe.has_key?(name)
    @adobe[name]
  elsif str.match(/\Auni[A-F\d]{4}\Z/)
    "0x#{str[3,4]}".hex
  elsif str.match(/\Au[A-F\d]{4,6}\Z/)
    "0x#{str[1,6]}".hex
  elsif str.match(/\A[A-Za-z]\d{1,4}\Z/)
    str[1,4].to_i
  elsif str.match(/\A[A-Za-z]{2}\d{2,4}\Z/)
    str[2,4].to_i
  else
    nil
  end
end