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})$/
FONT_NAMES_PREFERRED = 
['Consolas', 'Courier', 'Monospace', 'Liberation Mono']

Instance Attribute Summary collapse

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, after_body, #async_exec, #attribute_setter, before_body, body, #content, custom_widget_namespaces, def_option_attr_accessors, #disposed?, flyweight_custom_widget_classes, for, #get_attribute, #has_attribute?, #has_style?, #initialize, keyword, #local_respond_to?, namespaces_for_class, #observer_registrations, option, options, #post_add_content, #post_initialize_child, reset_custom_widget_namespaces, #set_attribute, shortcut_keyword, #sync_exec, #timer_exec

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &block) ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 62

def method_missing(method_name, *args, &block)
  dsl_mode = @dsl_mode || args.last.is_a?(Hash) && args.last[:dsl]
  if dsl_mode
    args.pop if args.last.is_a?(Hash) && args.last[:dsl]
    super(method_name, *args, &block)
  elsif @styled_text_proxy&.respond_to?(method_name, *args, &block)
    @line_numbers_styled_text_proxy&.send(method_name, *args, &block) if method_name.to_s == 'font='
    @styled_text_proxy&.send(method_name, *args, &block)
  else
    super
  end
end

Instance Attribute Details

#line_numbers_styled_text_proxy ⇒ Object (readonly)

Returns the value of attribute line_numbers_styled_text_proxy.



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# File 'lib/glimmer/swt/custom/code_text.rb', line 60

def line_numbers_styled_text_proxy
  @line_numbers_styled_text_proxy
end

#lines_width ⇒ Object (readonly)

Returns the value of attribute lines_width.



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# File 'lib/glimmer/swt/custom/code_text.rb', line 60

def lines_width
  @lines_width
end

#styled_text_proxy ⇒ Object (readonly)

Returns the value of attribute styled_text_proxy.



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# File 'lib/glimmer/swt/custom/code_text.rb', line 60

def styled_text_proxy
  @styled_text_proxy
end

#styled_text_proxy_text ⇒ Object

Returns the value of attribute styled_text_proxy_text.



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# File 'lib/glimmer/swt/custom/code_text.rb', line 59

def styled_text_proxy_text
  @styled_text_proxy_text
end

#styled_text_proxy_top_pixel ⇒ Object

Returns the value of attribute styled_text_proxy_top_pixel.



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# File 'lib/glimmer/swt/custom/code_text.rb', line 59

def styled_text_proxy_top_pixel
  @styled_text_proxy_top_pixel
end

Class Method Details

.languages ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 32

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 37

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

Instance Method Details

#add_observer(observer, attribute_name) ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 93

def add_observer(observer, attribute_name)
  if @styled_text_proxy&.can_add_observer?(attribute_name)
    @styled_text_proxy.add_observer(observer, attribute_name)
  else
    super
  end
end

#can_add_observer?(attribute_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/custom/code_text.rb', line 89

def can_add_observer?(attribute_name)
  @styled_text_proxy&.can_add_observer?(attribute_name) || super
end

#can_handle_observation_request?(observation_request) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/custom/code_text.rb', line 101

def can_handle_observation_request?(observation_request)
  @styled_text_proxy&.can_handle_observation_request?(observation_request) || super
rescue
  super
end

#code_text_widget ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 187

def code_text_widget
  @styled_text_proxy = styled_text(swt_style) {
#             custom_widget_property_owner # TODO implement to route properties here without declaring method_missing
    layout_data :fill, :fill, true, true if lines
    
    text <=> [self, :styled_text_proxy_text] if lines
    top_pixel <=> [self, :styled_text_proxy_top_pixel] if lines
    font @font_options
    background :black if @dark_mode
    foreground rgb(75, 75, 75)
    left_margin 5
    top_margin 5
    right_margin 5
    bottom_margin 5
    tabs 2
    
    if default_behavior
      on_key_pressed { |event|
        character = event.keyCode.chr rescue nil
        case [event.stateMask, character]
        when [(OS.mac? ? swt(:command) : swt(:ctrl)), 'a']
          @styled_text_proxy.selectAll
        when [(swt(:ctrl) if OS.mac?), 'a']
          jump_to_beginning_of_line
        when [(swt(:ctrl) if OS.mac?), 'e']
          jump_to_end_of_line
        end
      }
      on_verify_text { |verify_event|
        if verify_event.text == "\n"
          line_index = verify_event.widget.get_line_at_offset(verify_event.widget.get_caret_offset)
          line = verify_event.widget.get_line(line_index)
          line_indent = line.match(/^([ ]*)/)[1].to_s.size
          verify_event.text += ' '*line_indent
          verify_event.text += ' '*2 if line.strip.end_with?('{') || line.strip.match(/do([ ]*[|][^|]*[|])?$/) || line.start_with?('class') || line.start_with?('module') || line.strip.start_with?('def')
        end
      }
    end
    
    on_modify_text do |event|
      # clear unnecessary syntax highlighting cache on text updates, and do it async to avoid affecting performance
      new_text = event.data
      async_exec do
        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
      end
    end
          
    on_line_get_style do |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], [@dark_mode ? :white : :black])
          background_color = hex_color_to_swt_color(style_data[:bg], [@dark_mode ? :black : :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
  }
end

#handle_observation_request(observation_request, &block) ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 107

def handle_observation_request(observation_request, &block)
  if @styled_text_proxy&.can_handle_observation_request?(observation_request)
    @styled_text_proxy.handle_observation_request(observation_request, &block)
  else
    super
  end
rescue
  super
end

#has_instance_method?(method_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/custom/code_text.rb', line 85

def has_instance_method?(method_name)
  respond_to?(method_name)
end

#hex_color_to_swt_color(color_data, default_color) ⇒ Object

TODO extract this to ColorProxy



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# File 'lib/glimmer/swt/custom/code_text.rb', line 290

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

#jump_to_beginning_of_line ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 298

def jump_to_beginning_of_line
  current_line_index = @styled_text_proxy.getLineAtOffset(@styled_text_proxy.getCaretOffset)
  beginning_of_current_line_offset = @styled_text_proxy.getOffsetAtLine(current_line_index)
  @styled_text_proxy.setSelection(beginning_of_current_line_offset, beginning_of_current_line_offset)
end

#jump_to_end_of_line ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 304

def jump_to_end_of_line
  current_line_index = @styled_text_proxy.getLineAtOffset(@styled_text_proxy.getCaretOffset)
  current_line = @styled_text_proxy.getLine(current_line_index)
  beginning_of_current_line_offset = @styled_text_proxy.getOffsetAtLine(current_line_index)
  new_offset = beginning_of_current_line_offset + current_line.size
  @styled_text_proxy.setSelection(new_offset, new_offset)
end

#lexer ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 282

def lexer
  require 'rouge'
  # 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)
  @lexer ||= Rouge::Lexer.find_fancy('ruby') # default to Ruby if no lexer is found
end

#line_numbers_block=(block) ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 121

def line_numbers_block=(block)
  @line_numbers_styled_text_proxy.content(&block)
end

#line_numbers_text_from(text_value) ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 312

def line_numbers_text_from(text_value)
  line_count = "#{text_value} ".split("\n").count
  line_count = 1 if line_count == 0
  lines_text_size = [line_count.to_s.size, @lines_width].max
  @lines_width = lines_text_size if lines_text_size > @lines_width
  line_count.times.map {|n| (' ' * (lines_text_size - (n+1).to_s.size)) + (n+1).to_s }.join("\n") + "\n"
end

#respond_to?(method_name, *args, &block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/custom/code_text.rb', line 75

def respond_to?(method_name, *args, &block)
  dsl_mode = @dsl_mode || args.last.is_a?(Hash) && args.last[:dsl]
  if dsl_mode
    args = args[0...-1] if args.last.is_a?(Hash) && args.last[:dsl]
    super(method_name, *args, &block)
  else
    super || @styled_text_proxy&.respond_to?(method_name, *args, &block)
  end
end

#root_block=(block) ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 117

def root_block=(block)
  body_root.content(&block)
end

#select_best_font ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 320

def select_best_font
  select_best_font_name
  @font_options = {height: OS.mac? ? 15 : 12}
  @font_options.merge!(name: @font_name) if @font_name
  @font_options
end

#select_best_font_name ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 327

def select_best_font_name
  all_font_names = display.get_font_list(nil, true).map(&:name)
  @font_name = 'Courier' if OS.mac?
  FONT_NAMES_PREFERRED.each do |font_name|
    @font_name ||= font_name if all_font_names.include?(font_name)
  end
  @font_name ||= all_font_names.find {|font_name| font_name.downcase.include?('mono')}
  @font_name
end

#syntax_highlighting(text) ⇒ Object 



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# File 'lib/glimmer/swt/custom/code_text.rb', line 266

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