143 lines
4.3 KiB
Ruby
143 lines
4.3 KiB
Ruby
# coding: utf-8
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# typed: strict
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# frozen_string_literal: true
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################################################################################
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#
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# Copyright (C) 2011 James Healy (jimmy@deefa.com)
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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################################################################################
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class PDF::Reader
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# A Hash-like object that can convert glyph names into a unicode codepoint.
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# The mapping is read from a data file on disk the first time it's needed.
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#
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class GlyphHash # :nodoc:
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def initialize
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@@by_codepoint_cache ||= nil
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@@by_name_cache ||= nil
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# only parse the glyph list once, and cache the results (for performance)
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if @@by_codepoint_cache != nil && @@by_name_cache != nil
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@by_name = @@by_name_cache
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@by_codepoint = @@by_codepoint_cache
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else
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by_name, by_codepoint = load_adobe_glyph_mapping
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@by_name = @@by_name_cache ||= by_name
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@by_codepoint = @@by_codepoint_cache ||= by_codepoint
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end
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end
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# attempt to convert a PDF Name to a unicode codepoint. Returns nil
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# if no conversion is possible.
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#
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# h = GlyphHash.new
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#
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# h.name_to_unicode(:A)
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# => 65
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#
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# h.name_to_unicode(:Euro)
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# => 8364
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#
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# h.name_to_unicode(:X4A)
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# => 74
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#
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# h.name_to_unicode(:G30)
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# => 48
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#
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# h.name_to_unicode(:34)
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# => 34
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#
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def name_to_unicode(name)
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return nil unless name.is_a?(Symbol)
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name = name.to_s.gsub('_', '').intern
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str = name.to_s
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if @by_name.has_key?(name)
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@by_name[name]
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elsif str.match(/\AX[0-9a-fA-F]{2,4}\Z/)
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"0x#{str[1,4]}".hex
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elsif str.match(/\Auni[A-F\d]{4}\Z/)
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"0x#{str[3,4]}".hex
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elsif str.match(/\Au[A-F\d]{4,6}\Z/)
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"0x#{str[1,6]}".hex
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elsif str.match(/\A[A-Za-z]\d{1,5}\Z/)
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str[1,5].to_i
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elsif str.match(/\A[A-Za-z]{2}\d{2,5}\Z/)
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str[2,5].to_i
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else
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nil
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end
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end
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# attempt to convert a Unicode code point to the equivilant PDF Name. Returns nil
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# if no conversion is possible.
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#
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# h = GlyphHash.new
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#
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# h.unicode_to_name(65)
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# => [:A]
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#
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# h.unicode_to_name(8364)
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# => [:Euro]
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#
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# h.unicode_to_name(34)
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# => [:34]
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#
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def unicode_to_name(codepoint)
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@by_codepoint[codepoint.to_i] || []
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end
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private
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# returns a hash that maps glyph names to unicode codepoints. The mapping is based on
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# a text file supplied by Adobe at:
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# https://github.com/adobe-type-tools/agl-aglfn
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def load_adobe_glyph_mapping
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keyed_by_name = {}
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keyed_by_codepoint = {}
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paths = [
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File.dirname(__FILE__) + "/glyphlist.txt",
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File.dirname(__FILE__) + "/glyphlist-zapfdingbats.txt",
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]
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paths.each do |path|
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File.open(path, "r:BINARY") do |f|
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f.each do |l|
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_m, name, code = *l.match(/([0-9A-Za-z]+);([0-9A-F]{4})/)
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if name && code
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cp = "0x#{code}".hex
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keyed_by_name[name.to_sym] = cp
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keyed_by_codepoint[cp] ||= []
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keyed_by_codepoint[cp] << name.to_sym
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end
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end
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end
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end
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return keyed_by_name.freeze, keyed_by_codepoint.freeze
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end
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end
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end
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