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# coding: utf-8
# frozen_string_literal: true
################################################################################
#
# Copyright (C) 2011 James Healy (jimmy@deefa.com)
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
################################################################################
class PDF::Reader
# 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.
#
class GlyphHash # :nodoc:
def initialize
# only parse the glyph list once, and cache the results (for performance)
adobe = @@cache ||= load_adobe_glyph_mapping
@by_name = adobe.first
@by_codepoint = adobe.last
end
# attempt to convert a PDF Name to a unicode codepoint. Returns nil
# if no conversion is possible.
#
# h = GlyphHash.new
#
# h.name_to_unicode(:A)
# => 65
#
# h.name_to_unicode(:Euro)
# => 8364
#
# h.name_to_unicode(:X4A)
# => 74
#
# h.name_to_unicode(:G30)
# => 48
#
# h.name_to_unicode(:34)
# => 34
#
def name_to_unicode(name)
return nil unless name.is_a?(Symbol)
name = name.to_s.gsub('_', '').intern
str = name.to_s
if @by_name.has_key?(name)
@by_name[name]
elsif str.match(/\AX[0-9a-fA-F]{2,4}\Z/)
"0x#{str[1,4]}".hex
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{1,5}\Z/)
str[1,5].to_i
elsif str.match(/\A[A-Za-z]{2}\d{2,5}\Z/)
str[2,5].to_i
else
nil
end
end
# attempt to convert a Unicode code point to the equivilant PDF Name. Returns nil
# if no conversion is possible.
#
# h = GlyphHash.new
#
# h.unicode_to_name(65)
# => [:A]
#
# h.unicode_to_name(8364)
# => [:Euro]
#
# h.unicode_to_name(34)
# => [:34]
#
def unicode_to_name(codepoint)
@by_codepoint[codepoint.to_i] || []
end
private
# returns a hash that maps glyph names to unicode codepoints. The mapping is based on
# a text file supplied by Adobe at:
# http://www.adobe.com/devnet/opentype/archives/glyphlist.txt
def load_adobe_glyph_mapping
keyed_by_name = {}
keyed_by_codepoint = {}
File.open(File.dirname(__FILE__) + "/glyphlist.txt", "r:BINARY") do |f|
f.each do |l|
_m, name, code = *l.match(/([0-9A-Za-z]+);([0-9A-F]{4})/)
if name && code
cp = "0x#{code}".hex
keyed_by_name[name.to_sym] = cp
keyed_by_codepoint[cp] ||= []
keyed_by_codepoint[cp] << name.to_sym
end
end
end
[keyed_by_name.freeze, keyed_by_codepoint.freeze]
end
end
end
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