Module: PrawnStyledText

Defined in:
lib/prawn-styled-text/version.rb,
lib/prawn-styled-text/callbacks.rb,
lib/prawn-styled-text/prawn-styled-text.rb

Defined Under Namespace

Classes: HighlightCallback, StrikeThroughCallback

Constant Summary collapse

VERSION = 
'0.1.6'
BLOCK_TAGS = 
[:br, :div, :h1, :h2, :h3, :h4, :h5, :h6, :hr, :li, :p, :ul].freeze
DEF_BG_MARK = 
'ffff00'
DEF_HEADING_T = 
16
DEF_HEADING_H = 
8
DEF_MARGIN_UL = 
15
DEF_SYMBOL_UL = 
"\x95 "
HEADINGS = 
{ h1: 32, h2: 24, h3: 20, h4: 16, h5: 14, h6: 13 }.freeze
RENAME = 
{ 'font-family': :font, 'font-size': :size, 'font-style': :styles, 'letter-spacing': :character_spacing }.freeze
@@margin_ul = 
0
@@symbol_ul = 
''
@@last_el = 
nil

Class Method Summary collapse

Class Method Details

.adjust_values(pdf, values) ⇒ Object 



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# File 'lib/prawn-styled-text/prawn-styled-text.rb', line 21

def self.adjust_values(pdf, values)
  ret = {}
  values.each do |k, v|
    key = k.to_sym
    key = RENAME[key] if RENAME.include?(key)
    ret[key] =
      case key
      when :character_spacing
        v.to_f
      when :color
        v.delete '#'
      when :font
        matches = v.match /'([^']*)'|"([^"]*)"|(.*)/
        matches[3] || matches[2] || matches[1] || ''
      when :height
        i = v.to_i
        v.include?('%') ? (i * pdf.bounds.height * 0.01) : i
      when :size
        v.to_i
      when :styles
        v.split(',').map { |s| s.strip.to_sym }
      when :width
        i = v.to_i
        v.include?('%') ? (i * pdf.bounds.width * 0.01) : i
      else
        v
      end
  end
  ret
end

.closing_tag(pdf, data) ⇒ Object 



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# File 'lib/prawn-styled-text/prawn-styled-text.rb', line 52

def self.closing_tag(pdf, data)
  context = { tag: data[:name], options: {} }
  context[:flush] ||= true if BLOCK_TAGS.include? data[:name]
  # Evalutate tag
  case data[:name]
  when :br # new line
    context[:text] ||= [ { text: "\n" } ] if @@last_el == :br
  when :img # image
    context[:flush] ||= true
    context[:src] = data[:node].get 'src'
  when :ul
    @@margin_ul = 0
  end
  # Evalutate attributes
  attributes = data[:node].get 'style'
  context[:options] = adjust_values(pdf, attributes.scan(/\s*([^:]+):\s*([^;]+)[;]*/)) if attributes
  context
end

.opening_tag(pdf, data) ⇒ Object 



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# File 'lib/prawn-styled-text/prawn-styled-text.rb', line 71

def self.opening_tag(pdf, data)
  context = { tag: data[:name], options: {} }
  context[:flush] ||= true if BLOCK_TAGS.include? data[:name]
  # Evalutate attributes
  attributes = data[:node].get 'style'
  context[:options].merge!(adjust_values(pdf, attributes.scan(/\s*([^:]+):\s*([^;]+)[;]*/))) if attributes
  if data[:name] == :ul
    @@margin_ul += (context[:options][:'margin-left'] ? context[:options][:'margin-left'].to_i : DEF_MARGIN_UL)
    @@symbol_ul = if context[:options][:'list-symbol']
        matches = context[:options][:'list-symbol'].match /'([^']*)'|"([^"]*)"|(.*)/
        matches[3] || matches[2] || matches[1] || ''
      else
        DEF_SYMBOL_UL.dup
      end
  end
  context
end

.text_node(pdf, data) ⇒ Object 



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# File 'lib/prawn-styled-text/prawn-styled-text.rb', line 89

def self.text_node(pdf, data)
  context = { pre: '', options: {} }
  styles = []
  font_size = pdf.font_size
  data.each do |part|
    # Evalutate tag
    tag = part[:name]
    case tag
    when :a # link
      link = part[:node].get 'href'
      context[:options][:link] = link if link
    when :b, :strong # bold
      styles.push :bold
    when :del, :s
      @@strike_through ||= StrikeThroughCallback.new(pdf)
      context[:options][:callback] = @@strike_through
    when :h1, :h2, :h3, :h4, :h5, :h6
      context[:options][:size] = HEADINGS[tag]
      context[:options][:'margin-top'] = DEF_HEADING_T
      context[:options][:'line-height'] = DEF_HEADING_H
    when :i, :em # italic
      styles.push :italic
    when :li # list item
      context[:options][:'margin-left'] = @@margin_ul
      context[:pre] = @@symbol_ul.force_encoding('windows-1252').encode('UTF-8')
    when :mark
      @@highlight ||= HighlightCallback.new(pdf)
      @@highlight.set_color nil
      context[:options][:callback] = @@highlight
    when :small
      context[:options][:size] = font_size * 0.66
    when :u, :ins # underline
      styles.push :underline
    end
    context[:options][:styles] = styles if styles.any?
    # Evalutate attributes
    attributes = part[:node].get 'style'
    if attributes
      values = adjust_values(pdf, attributes.scan(/\s*([^:]+):\s*([^;]+)[;]*/))
      @@highlight.set_color(values[:background].delete('#')) if tag == :mark && values[:background]
      context[:options].merge! values
    end
    font_size = context[:options][:size] if font_size
  end
  context
end

.traverse(nodes, context = [], &block) ⇒ Object 



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# File 'lib/prawn-styled-text/prawn-styled-text.rb', line 136

def self.traverse(nodes, context = [], &block)
  nodes.each do |node|
    if node.is_a? Oga::XML::Text
      text = node.text.delete("\n\r")
      yield :text_node, text, context
      @@last_el = nil unless text.empty?
    elsif node.is_a? Oga::XML::Element
      element = { name: node.name.to_sym, node: node }
      yield :opening_tag, element[:name], element
      context.push(element)
      traverse(node.children, context, &block) if node.children.count > 0
      yield :closing_tag, element[:name], context.pop
      @@last_el = element[:name]
    end
  end
end