Class: Glimmer::SWT::Custom::CodeText

Inherits:
Object
  • Object
show all
Includes:
UI::CustomWidget
Defined in:
lib/glimmer/swt/custom/code_text.rb

Overview

CodeText is a customization of StyledText with support for Ruby Syntax Highlighting

Constant Summary collapse

REGEX_COLOR_HEX6 = 
/^#([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$/

Instance Attribute Summary

Attributes included from UI::CustomWidget

#body_root, #options, #parent, #parent_proxy, #swt_style, #swt_widget

Class Method Summary collapse

Instance Method Summary collapse

Methods included from UI::CustomWidget

add_custom_widget_namespaces_for, #add_observer, after_body, #async_exec, #attribute_setter, before_body, body, #can_add_observer?, #can_handle_observation_request?, #content, custom_widget_namespaces, def_option_attr_accessors, #disposed?, flyweight_custom_widget_classes, for, #get_attribute, #handle_observation_request, #has_attribute?, #has_instance_method?, #has_style?, #initialize, keyword, #local_respond_to?, #method_missing, namespaces_for_class, option, options, #pack, #post_initialize_child, reset_custom_widget_namespaces, #respond_to?, #set_attribute, shortcut_keyword, #sync_exec

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Glimmer::UI::CustomWidget

Class Method Details

.languages ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 11

def languages
  require 'rouge'
  Rouge::Lexer.all.map {|lexer| lexer.tag}.sort
end

.lexers ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 16

def lexers
  require 'rouge'
  Rouge::Lexer.all.sort_by(&:title)
end

Instance Method Details

#code_text_widget ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 139

def code_text_widget
  @styled_text_proxy = styled_text(swt_style) {
#             layout_data :fill, :fill, true, true if lines
#             text bind(self, :code_text_widget_text) if lines
#             top_pixel bind(self, :code_text_widget_top_pixel) if lines
    font name: @font_name, height: 15
    foreground rgb(75, 75, 75)
    left_margin 5
    top_margin 5
    right_margin 5
    bottom_margin 5
    
    on_modify_text { |event|
      # clear unnecessary syntax highlighting cache on text updates, and do it async to avoid affecting performance
      new_text = event.data
      async_exec {
        unless @syntax_highlighting.nil?
          lines = new_text.to_s.split("\n")
          line_diff = @syntax_highlighting.keys - lines
          line_diff.each do |line|
            @syntax_highlighting.delete(line)
          end
        end
      }
    }
          
    on_line_get_style { |line_style_event|
      begin
        styles = []
        style_data = nil
        syntax_highlighting(line_style_event.lineText).to_a.each do |token_hash|
          start_index = token_hash[:token_index]
          size = token_hash[:token_text].size
          style_data = Rouge::Theme.find(theme).new.style_for(token_hash[:token_type])
          foreground_color = hex_color_to_swt_color(style_data[:fg], [:black])
          background_color = hex_color_to_swt_color(style_data[:bg], [:white])
          font_styles = []
          font_styles << :bold if style_data[:bold]
          font_styles << :italic if style_data[:italic]
          font_style = SWTProxy[*font_styles]
          styles << StyleRange.new(line_style_event.lineOffset + start_index, size, foreground_color, background_color, font_style)
        end
        line_style_event.styles = styles.to_java(StyleRange) unless styles.empty?
      rescue => e
        Glimmer::Config.logger.error {"Error encountered with style data: #{style_data}"}
        Glimmer::Config.logger.error {e.message}
        Glimmer::Config.logger.error {e.full_message}
      end
    }
  }
end

#hex_color_to_swt_color(color_data, default_color) ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 191

def hex_color_to_swt_color(color_data, default_color)
  color_data = "##{color_data.chars.drop(1).map {|c| c*2}.join}" if color_data.is_a?(String) && color_data.start_with?('#') && color_data&.size == 4
  color_data = color_data.match(REGEX_COLOR_HEX6).to_a.drop(1).map {|c| "0x#{c}".hex}.to_a if color_data.is_a?(String) && color_data.start_with?('#')
  color_data = [color_data] unless color_data.nil? || color_data.empty? || color_data.is_a?(Array)
  color_data = default_color if color_data.nil? || color_data.empty?
  color(*color_data).swt_color
end

#lexer ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 80

def lexer
  # TODO Try to use Rouge::Lexer.find_fancy('guess', code) in the future to guess the language or otherwise detect it from file extension
  @lexer ||= Rouge::Lexer.find_fancy(language)
end

#syntax_highlighting(text) ⇒ Object

def lines_width

  if lines == true
    4
  elsif lines.is_a?(Hash)
    lines[:width]
  end
end



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# File 'lib/glimmer/swt/custom/code_text.rb', line 64

def syntax_highlighting(text)
  return [] if text.to_s.strip.empty?
  @syntax_highlighting ||= {}
  unless @syntax_highlighting.keys.include?(text)
    lex = lexer.lex(text).to_a
    text_size = 0
    @syntax_highlighting[text] = lex.map do |pair|
      {token_type: pair.first, token_text: pair.last}
    end.each do |hash|
      hash[:token_index] = text_size
      text_size += hash[:token_text].size
    end
  end
  @syntax_highlighting[text]
end