Add bin and edit workflow

bin/gems/rouge-4.7.0/lib/rouge/formatters/terminal256.rb

@@ -0,0 +1,198 @@
+# -*- coding: utf-8 -*- #
+# frozen_string_literal: true
+
+module Rouge
+  module Formatters
+    # A formatter for 256-color terminals
+    class Terminal256 < Formatter
+      tag 'terminal256'
+
+      # @private
+      attr_reader :theme
+
+      # @param [Hash,Rouge::Theme] theme
+      #   the theme to render with.
+      def initialize(theme = Themes::ThankfulEyes.new)
+        if theme.is_a?(Rouge::Theme)
+          @theme = theme
+        elsif theme.is_a?(Hash)
+          @theme = theme[:theme] || Themes::ThankfulEyes.new
+        else
+          raise ArgumentError, "invalid theme: #{theme.inspect}"
+        end
+      end
+
+      def stream(tokens, &b)
+        tokens.each do |tok, val|
+          escape_sequence(tok).stream_value(val, &b)
+        end
+      end
+
+      class EscapeSequence
+        attr_reader :style
+        def initialize(style)
+          @style = style
+        end
+
+        def self.xterm_colors
+          @xterm_colors ||= [].tap do |out|
+            # colors 0..15: 16 basic colors
+            out << [0x00, 0x00, 0x00] # 0
+            out << [0xcd, 0x00, 0x00] # 1
+            out << [0x00, 0xcd, 0x00] # 2
+            out << [0xcd, 0xcd, 0x00] # 3
+            out << [0x00, 0x00, 0xee] # 4
+            out << [0xcd, 0x00, 0xcd] # 5
+            out << [0x00, 0xcd, 0xcd] # 6
+            out << [0xe5, 0xe5, 0xe5] # 7
+            out << [0x7f, 0x7f, 0x7f] # 8
+            out << [0xff, 0x00, 0x00] # 9
+            out << [0x00, 0xff, 0x00] # 10
+            out << [0xff, 0xff, 0x00] # 11
+            out << [0x5c, 0x5c, 0xff] # 12
+            out << [0xff, 0x00, 0xff] # 13
+            out << [0x00, 0xff, 0xff] # 14
+            out << [0xff, 0xff, 0xff] # 15
+
+            # colors 16..232: the 6x6x6 color cube
+            valuerange = [0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff]
+
+            217.times do |i|
+              r = valuerange[(i / 36) % 6]
+              g = valuerange[(i / 6) % 6]
+              b = valuerange[i % 6]
+              out << [r, g, b]
+            end
+
+            # colors 233..253: grayscale
+            1.upto 22 do |i|
+              v = 8 + i * 10
+              out << [v, v, v]
+            end
+          end
+        end
+
+        def fg
+          return @fg if instance_variable_defined? :@fg
+          @fg = style.fg && self.class.color_index(style.fg)
+        end
+
+        def bg
+          return @bg if instance_variable_defined? :@bg
+          @bg = style.bg && self.class.color_index(style.bg)
+        end
+
+
+        def stream_value(val, &b)
+          yield style_string
+          yield val.gsub("\e", "\\e")
+                   .gsub("\n", "#{reset_string}\n#{style_string}")
+          yield reset_string
+        end
+
+        def style_string
+          @style_string ||= begin
+            attrs = []
+
+            attrs << ['38', '5', fg.to_s] if fg
+            attrs << ['48', '5', bg.to_s] if bg
+            attrs << '01' if style[:bold]
+            attrs << '04' if style[:italic] # underline, but hey, whatevs
+            escape(attrs)
+          end
+        end
+
+        def reset_string
+          @reset_string ||= begin
+            attrs = []
+            attrs << '39' if fg # fg reset
+            attrs << '49' if bg # bg reset
+            attrs << '00' if style[:bold] || style[:italic]
+
+            escape(attrs)
+          end
+        end
+
+      private
+        def escape(attrs)
+          return '' if attrs.empty?
+          "\e[#{attrs.join(';')}m"
+        end
+
+        def self.color_index(color)
+          @color_index_cache ||= {}
+          @color_index_cache[color] ||= closest_color(*get_rgb(color))
+        end
+
+        def self.get_rgb(color)
+          color = $1 if color =~ /#([0-9a-f]+)/i
+          hexes = case color.size
+          when 3
+            color.chars.map { |c| "#{c}#{c}" }
+          when 6
+            color.scan(/../)
+          else
+            raise "invalid color: #{color}"
+          end
+
+          hexes.map { |h| h.to_i(16) }
+        end
+
+        # max distance between two colors, #000000 to #ffffff
+        MAX_DISTANCE = 257 * 257 * 3
+
+        def self.closest_color(r, g, b)
+          @@colors_cache ||= {}
+          key = (r << 16) + (g << 8) + b
+          @@colors_cache.fetch(key) do
+            distance = MAX_DISTANCE
+
+            match = 0
+
+            xterm_colors.each_with_index do |(cr, cg, cb), i|
+              d = (r - cr)**2 + (g - cg)**2 + (b - cb)**2
+              next if d >= distance
+
+              match = i
+              distance = d
+            end
+
+            match
+          end
+        end
+      end
+
+      class Unescape < EscapeSequence
+        def initialize(*) end
+        def style_string(*) '' end
+        def reset_string(*) '' end
+        def stream_value(val) yield val end
+      end
+
+    # private
+      def escape_sequence(token)
+        return Unescape.new if escape?(token)
+        @escape_sequences ||= {}
+        @escape_sequences[token.qualname] ||=
+          make_escape_sequence(get_style(token))
+      end
+
+      def make_escape_sequence(style)
+        EscapeSequence.new(style)
+      end
+
+      def get_style(token)
+        return text_style if token.ancestors.include? Token::Tokens::Text
+
+        theme.get_own_style(token) || text_style
+      end
+
+      def text_style
+        style = theme.get_style(Token['Text'])
+        # don't highlight text backgrounds
+        style.delete :bg
+        style
+      end
+    end
+  end
+end