Class: RSyntaxTree::RSGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/rsyntaxtree.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params = {}) ⇒ RSGenerator

Returns a new instance of RSGenerator.



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# File 'lib/rsyntaxtree.rb', line 53

def initialize(params = {})
  new_params = {}
  fontset = {}
  params.each do |keystr, value|
    key = keystr.to_sym
    case key
    when :data
      data = value
      data = data.gsub('-AMP-', '&')
                 .gsub('-PERCENT-', "%")
                 .gsub('-PRIME-', "'")
                 .gsub('-SCOLON-', ';')
                 .gsub('-OABRACKET-', '<')
                 .gsub('-CABRACKET-', '>')
                 .gsub('¥¥', '\¥')
                 .gsub(/(?<!\\)¥/, "\\")
      new_params[key] = data

    when :symmetrize, :transparent, :polyline, :hide_default_connectors
      new_params[key] = value && (value != "off" && value != "false") ? true : false
    when :color
      new_params[key] = case value
                        when "modern", "on", "true"
                          "modern"
                        when "traditional"
                          "traditional"
                        else
                          "off"
                        end
    when :fontsize
      new_params[key] = value.to_i
    when :linewidth
      new_params[key] = value.to_i
    when :vheight
      new_params[key] = value.to_f
    when :fontstyle
      case value
      when "noto-sans-mono", "mono"
        fontset[:normal] = FONT_DIR + "/NotoSansMono_SemiCondensed-Regular.ttf"
        fontset[:italic] = FONT_DIR + "/NotoSansMono_SemiCondensed-Regular.ttf"
        fontset[:bold] = FONT_DIR + "/NotoSansMono_SemiCondensed-Bold.ttf"
        fontset[:bolditalic] = FONT_DIR + "/NotoSansMono_SemiCondensed-Bold.ttf"
        fontset[:math] = FONT_DIR + "/latinmodern-math.otf"
        fontset[:cjk] = FONT_DIR + "/NotoSansJP-Regular.otf"
        fontset[:emoji] = FONT_DIR + "/OpenMoji-black-glyf.ttf"
        new_params[:fontstyle] = "mono"
      when "noto-sans", "sans"
        fontset[:normal] = FONT_DIR + "/NotoSans-Regular.ttf"
        fontset[:italic] = FONT_DIR + "/NotoSans-Italic.ttf"
        fontset[:bold] = FONT_DIR + "/NotoSans-Bold.ttf"
        fontset[:bolditalic] = FONT_DIR + "/NotoSans-BoldItalic.ttf"
        fontset[:math] = FONT_DIR + "/NotoSansMath-Regular.ttf"
        fontset[:cjk] = FONT_DIR + "/NotoSansJP-Regular.otf"
        fontset[:emoji] = FONT_DIR + "/OpenMoji-black-glyf.ttf"
        new_params[:fontstyle] = "sans"
      when "noto-serif", "serif"
        fontset[:normal] = FONT_DIR + "/NotoSerif-Regular.ttf"
        fontset[:italic] = FONT_DIR + "/NotoSerif-Italic.ttf"
        fontset[:bold] = FONT_DIR + "/NotoSerif-Bold.ttf"
        fontset[:bolditalic] = FONT_DIR + "/NotoSerif-BoldItalic.ttf"
        fontset[:math] = FONT_DIR + "/latinmodern-math.otf"
        fontset[:cjk] = FONT_DIR + "/NotoSerifJP-Regular.otf"
        fontset[:emoji] = FONT_DIR + "/OpenMoji-black-glyf.ttf"
        new_params[:fontstyle] = "serif"
      when "cjk zenhei", "cjk"
        fontset[:normal] = FONT_DIR + "/wqy-zenhei.ttf"
        fontset[:italic] = FONT_DIR + "/NotoSans-Italic.ttf"
        fontset[:bold] = FONT_DIR + "/NotoSans-Bold.ttf"
        fontset[:bolditalic] = FONT_DIR + "/NotoSans-BoldItalic.ttf"
        fontset[:math] = FONT_DIR + "/NotoSansMath-Regular.ttf"
        fontset[:cjk] = FONT_DIR + "/wqy-zenhei.ttf"
        fontset[:emoji] = FONT_DIR + "/OpenMoji-black-glyf.ttf"
        new_params[:fontstyle] = "cjk"
      end
    else
      new_params[key] = value
    end
  end

  # defaults to the following
  @params = DEFAULT_OPTS.dup
  @params.merge! new_params
  @params[:fontsize] = @params[:fontsize] * FONT_SCALING
  @params[:fontset] = fontset
  single_x_metrics = FontMetrics.get_metrics("X", fontset[:normal], @params[:fontsize], :normal, :normal)
  @global = {}
  @global[:single_x_metrics] = single_x_metrics
  @global[:height_connector_to_text] = single_x_metrics.height / 2.0
  @global[:single_line_height] = single_x_metrics.height * 2.0
  @global[:width_half_x] = single_x_metrics.width / 2.0
  @global[:height_connector] = single_x_metrics.height * @params[:vheight]
  @global[:h_gap_between_nodes] = single_x_metrics.width * 0.8
  @global[:box_vertical_margin] = single_x_metrics.height * 0.8
end

Class Method Details

.check_data(text) ⇒ Object

Raises:



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# File 'lib/rsyntaxtree.rb', line 148

def self.check_data(text)
  raise RSTError, +"Error: input text is empty" if text.to_s == ""

  StringParser.valid?(text)
end

Instance Method Details

#draw_pdf(binary = false) ⇒ Object 



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# File 'lib/rsyntaxtree.rb', line 172

def draw_pdf(binary = false)
  b = StringIO.new
  svg = draw_svg
  rsvg = RSVG::Handle.new_from_data(svg)
  dim = rsvg.dimensions
  surface = Cairo::PDFSurface.new(b, dim.width, dim.height)
  context = Cairo::Context.new(surface)
  context.render_rsvg_handle(rsvg)
  surface.finish
  if binary
    b
  else
    b.string
  end
rescue Cairo::InvalidSize
  raise RSTError, +"Error: the result syntree is too big"
end

#draw_png(binary = false) ⇒ Object 



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# File 'lib/rsyntaxtree.rb', line 154

def draw_png(binary = false)
  svg = draw_svg
  rsvg = RSVG::Handle.new_from_data(svg)
  dim = rsvg.dimensions
  surface = Cairo::ImageSurface.new(Cairo::FORMAT_ARGB32, dim.width, dim.height)
  context = Cairo::Context.new(surface)
  context.render_rsvg_handle(rsvg)
  b = StringIO.new
  surface.write_to_png(b)
  if binary
    b
  else
    b.string
  end
rescue Cairo::InvalidSize
  raise RSTError, +"Error: the result syntree is too big"
end

#draw_svg ⇒ Object 



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# File 'lib/rsyntaxtree.rb', line 190

def draw_svg
  sp = StringParser.new(@params[:data].gsub('&', '&amp;'), @params[:fontset], @params[:fontsize], @global)
  sp.parse
  graph = SVGGraph.new(sp.get_elementlist, @params, @global)
  graph.svg_data
end

#draw_tree ⇒ Object

Currently not used



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# File 'lib/rsyntaxtree.rb', line 198

def draw_tree
  svg = draw_svg
  image, _data = Magick::Image.from_blob(svg) do |im|
    im.format = 'svg'
  end
  image.to_blob do |im|
    im.format = @params[:format].upcase
  end
  image
end