Add bin and edit workflow

bin/gems/pdf-reader-2.14.1/lib/pdf/reader/glyph_hash.rb

@@ -0,0 +1,142 @@
+# coding: utf-8
+# typed: strict
+# 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
+      @@by_codepoint_cache ||= nil
+      @@by_name_cache ||= nil
+
+      # only parse the glyph list once, and cache the results (for performance)
+      if @@by_codepoint_cache != nil && @@by_name_cache != nil
+        @by_name      = @@by_name_cache
+        @by_codepoint = @@by_codepoint_cache
+      else
+        by_name, by_codepoint = load_adobe_glyph_mapping
+        @by_name      = @@by_name_cache ||= by_name
+        @by_codepoint = @@by_codepoint_cache ||= by_codepoint
+      end
+    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:
+    # https://github.com/adobe-type-tools/agl-aglfn
+    def load_adobe_glyph_mapping
+      keyed_by_name      = {}
+      keyed_by_codepoint = {}
+
+      paths = [
+        File.dirname(__FILE__) + "/glyphlist.txt",
+        File.dirname(__FILE__) + "/glyphlist-zapfdingbats.txt",
+      ]
+      paths.each do |path|
+        File.open(path, "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
+      end
+
+      return keyed_by_name.freeze, keyed_by_codepoint.freeze
+    end
+
+  end
+end