Class: Booky::Layout::Base::Code

Inherits:
Element
  • Object
show all
Includes:
Helpers
Defined in:
lib/booky/layout/base/code.rb

Defined Under Namespace

Classes: LanguageMissing

Constant Summary collapse

OPTIONS = 
{
  :align => :left,
  :size => 12
}
COLORS = 
{
  :default                => 'FFFFFF',
  :background             => '2B2B2B',
  :background_2           => '383838',
  
  :line_number => {
    :number               => '9C9C9C',
    :background           => 'E2E2E2'
  },
  
  :comment                => 'BC9458',
  :keyword                => 'EC922E',
  :constant               => 'FFFFFF',
  :operator               => 'FFFFFF',
  :ident                  => 'FFC66D',
  :instance_variable      => 'D0D0FF',
  :integer                => 'A5C261',
  :float                  => 'A5C261',
  :string                 => 'A5C261',
  :delimiter              => 'A5C261',
  :content                => 'A5C261',
  :inline_delimiter       => '519F50'
}

Instance Attribute Summary

Attributes inherited from Element

#ast, #document, #index, #options

Instance Method Summary collapse

Methods included from Helpers

#add_to_toc, #is_first_rendering?, #update_levels

Methods inherited from Element

#initialize, #method_missing, #next_option, #previous_option

Constructor Details

This class inherits a constructor from Booky::Layout::Element

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Booky::Layout::Element

Instance Method Details

#convert_entities(token) ⇒ Object 



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# File 'lib/booky/layout/base/code.rb', line 70

def convert_entities(token)
  [
    ['>', '>'],
    ['<', '&lt;']
  ].each do |entity|
    token.gsub! entity.first, entity.last
  end
  token
end

#create_heading ⇒ Object 



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# File 'lib/booky/layout/base/code.rb', line 61

def create_heading
  return unless @options[:title]
  
  fill_color Booky::Layout::Base::COLORS[1]
  text @options[:title], OPTIONS
  fill_color Booky::Layout::Base::COLORS[0]
  move_down 0.2.cm
end

#make_highlighting ⇒ Object 



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# File 'lib/booky/layout/base/code.rb', line 94

def make_highlighting
  return if @options[:language] == 'text'
  @stack = []
  @source = ""
  until @tokens.empty? do
    token, type = @tokens.shift(2)
    color = COLORS.key?(type) ? COLORS[type] : COLORS[:default]
    
    # Keep track of current stack level
    @stack << type    if token == :begin_group
    @stack.pop        if token == :end_group
    
    @source << "</color>" if type == :content
    
    case token
      when :begin_group then  @source << "<color rgb='#{color}'>"
      when :end_group   then  @source << "</color>"
      else
        token = convert_entities(token)
        if @stack.empty?
          @source << (type == :space ? token : "<color rgb='#{color}'>#{token}</color>")
        else
          group_color = COLORS.key?(type) ? COLORS[type] : false
          @source << (group_color ? token.split("\n").map{ |token| "<color rgb='#{group_color}'>#{token}</color>" }.join("\n") : token)
        end
    end
  end
  
  # Keep text indentation at the beginning of the lines by replacing the " " with unicode NBSPs
  @source.gsub! " ", "\u00a0"
end

#make_table ⇒ Object 



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# File 'lib/booky/layout/base/code.rb', line 126

def make_table
  @line = 0
  @lines = @source.split("\n").map do |line|
    @line += 1
    line = "\u00a0" if line.length == 28
    line    = make_cell(
      :content  => line,
      :padding  => [2, 2, 2, 7]
    )
    number  = make_cell(
      :content          => "<color rgb='#{COLORS[:line_number][:number]}'>#{@line}</color>", 
      :align            => :right,
      :background_color => COLORS[:line_number][:background],
      :padding          => [2, 7, 2, 2]
    )
    [number, line]
  end
  
  font 'Monaco' do
    table(@lines,
      :header => false,
      :width  => bounds.width,
      :column_widths => { 0 => 1.cm },
      :row_colors => [COLORS[:background], COLORS[:background]],
      :cell_style => { 
        :inline_format  => true,
        :borders        => [],
        :border_widths  => [0] * 4,
        :border_color   => COLORS[:background],
        :size           => 8
      }
    )
  end
  move_down 1.cm
end

#make_text_tokens ⇒ Object 



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# File 'lib/booky/layout/base/code.rb', line 85

def make_text_tokens
  @source = @options[:text].lines.collect do |line|
    line.gsub! "\n", ""
    "<color rgb='#{COLORS[:default]}'>#{convert_entities(line)}</color>\n"
  end
  @source.pop
  @source = @source.join
end

#make_tokens ⇒ Object 



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# File 'lib/booky/layout/base/code.rb', line 80

def make_tokens
  make_text_tokens and return if @options[:language] == 'text'
  @tokens = CodeRay.scan(@options[:text], @options[:language].to_sym).tokens
end

#start_new_page_if_needed ⇒ Object 



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# File 'lib/booky/layout/base/code.rb', line 162

def start_new_page_if_needed
  start_new_page if cursor < (bounds.bottom + 4.cm)
end

#to_prawn ⇒ Object

Raises:



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# File 'lib/booky/layout/base/code.rb', line 166

def to_prawn
  raise LanguageMissing.new(@options[:text]) if @options[:language].nil?
  
  start_new_page_if_needed
  
  Booky::Layout.config.patch_table_cell = true
  
  make_tokens
  make_highlighting
  
  create_heading
  make_table
  
  Booky::Layout.config.patch_table_cell = false
end