Module: Jekyll::DiceTray::HtmlRewriter

Defined in:
lib/jekyll/dice_tray/html_rewriter.rb

Constant Summary collapse

DICE_RE = 
/
  (?<![A-Za-z0-9_])
  (?:
    (?:\d{1,3})?d\d{1,4}
    (?:\s*[+-]\s*\d{1,5})?
    (?:
      \s*[+-]\s*(?:\d{1,3})?d\d{1,4}
      (?:\s*[+-]\s*\d{1,5})?
    )?
  )
  (?![A-Za-z0-9_])
/x
THAC0_WORD_RE = 
/THAC0/i
BRACKET_INNER_RE = 
/
  [+-]?
  \d{1,5}
  (?:\s*[+-]\s*\d{1,5})*
/x
THAC0_INLINE_RE =

“THAC0 18 [+1]” in one run of text — link the inner “+1”, roll d20+1.

/
  THAC0\s*:?\s*
  \d{1,2}
  \s*
  \[
  \s*
  (?<mod>#{BRACKET_INNER_RE})
  \s*
  \]
/ix
THAC0_VALUE_BRACKET_RE =

“18 [+1]” in a THAC0 table row or under a THAC0 column header.

/
  (?<!\d)
  \d{1,2}
  \s*
  \[
  \s*
  (?<mod>#{BRACKET_INNER_RE})
  \s*
  \]
/x
SKIP_ANCESTORS = 
%w[pre code a script style textarea].freeze

Class Method Summary collapse

Class Method Details

.bracket_mod_hit(text, m) ⇒ Object 



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# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 82

def self.bracket_mod_hit(text, m)
  {
    start: m.begin(0),
    end: m.end(0),
    expr: bracket_mod_to_roll_expr(m[:mod]),
    label_start: m.begin(:mod),
    label_end: m.end(:mod),
    prefix: text[m.begin(0)...m.begin(:mod)],
    suffix: text[m.end(:mod)...m.end(0)],
  }
end

.bracket_mod_to_roll_expr(inner) ⇒ Object 



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# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 51

def self.bracket_mod_to_roll_expr(inner)
  compact = inner.gsub(/\s+/, "")
  mod = 0
  compact.scan(/[+-]?\d+/) { |term| mod += term.to_i }
  return "d20" if mod.zero?

  mod.positive? ? "d20+#{mod}" : "d20#{mod}"
end

.collect_roll_matches(text, node) ⇒ Object 



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# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 94

def self.collect_roll_matches(text, node)
  matches = []

  text.to_enum(:scan, DICE_RE).each do
    m = Regexp.last_match
    matches << {
      start: m.begin(0),
      end: m.end(0),
      expr: m[0],
      label_start: m.begin(0),
      label_end: m.end(0),
    }
  end

  text.to_enum(:scan, THAC0_INLINE_RE).each do
    matches << bracket_mod_hit(text, Regexp.last_match)
  end

  if thac0_bracket_context?(node)
    text.to_enum(:scan, THAC0_VALUE_BRACKET_RE).each do
      matches << bracket_mod_hit(text, Regexp.last_match)
    end
  end

  matches.sort_by! { |hit| hit[:start] }
  accepted = []
  matches.each do |hit|
    next if accepted.any? { |prev| hit[:start] < prev[:end] && hit[:end] > prev[:start] }

    accepted << hit
  end
  accepted
end

.inject_tray(html, assets_path:) ⇒ Object 



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# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 180

def self.inject_tray(html, assets_path:)
  return html if html.include?('data-dice-tray-root="true"')

  tray = <<~HTML
    <div id="jekyll-dice-tray" data-dice-tray-root="true" aria-live="polite">
      <div class="jdt-header">
        <button type="button" class="jdt-toggle" aria-expanded="false" title="Toggle dice tray">Dice</button>
      </div>
      <div class="jdt-body" hidden>
        <div class="jdt-clue">Type <code>1d20+5</code> or <code>/help</code>, then press Enter.</div>
        <div class="jdt-log" role="log" aria-label="Dice roll log"></div>
        <input class="jdt-input" type="text" inputmode="text" autocomplete="off" spellcheck="false"
          placeholder="Roll: 1d6, d4, 2d8+1, /help" />
      </div>
    </div>
  HTML

  tags = <<~HTML
    <link rel="stylesheet" href="#{assets_path}/dice_tray.css" />
    <script defer src="#{assets_path}/dice_tray.js"></script>
  HTML

  if html.include?("</body>")
    html.sub("</body>", "#{tray}\n#{tags}\n</body>")
  else
    "#{html}\n#{tray}\n#{tags}\n"
  end
end

.rewrite(html) ⇒ Object 



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# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 128

def self.rewrite(html)
  frag = Nokogiri::HTML::DocumentFragment.parse(html)

  frag.traverse do |node|
    next unless node.text?
    next if node.content.nil? || node.content.empty?
    next if node.ancestors.any? { |a| SKIP_ANCESTORS.include?(a.name) }

    text = node.content
    hits = collect_roll_matches(text, node)
    next if hits.empty?

    new_nodes = []
    last = 0

    hits.each do |hit|
      start_idx = hit[:start]
      end_idx = hit[:end]

      new_nodes << Nokogiri::XML::Text.new(text[last...start_idx], frag.document) if start_idx > last

      if hit[:prefix]
        new_nodes << Nokogiri::XML::Text.new(hit[:prefix], frag.document) if !hit[:prefix].empty?

        a = Nokogiri::XML::Node.new("a", frag.document)
        a["href"] = "#"
        a["class"] = "dice-tray-roll"
        a["data-dice"] = hit[:expr]
        a.content = text[hit[:label_start]...hit[:label_end]]
        new_nodes << a

        new_nodes << Nokogiri::XML::Text.new(hit[:suffix], frag.document) if !hit[:suffix].empty?
      else
        a = Nokogiri::XML::Node.new("a", frag.document)
        a["href"] = "#"
        a["class"] = "dice-tray-roll"
        a["data-dice"] = hit[:expr]
        a.content = text[hit[:label_start]...hit[:label_end]]
        new_nodes << a
      end

      last = end_idx
    end

    new_nodes << Nokogiri::XML::Text.new(text[last..], frag.document) if last < text.length

    node.replace(new_nodes.map(&:to_html).join)
  end

  frag.to_html
end

.thac0_bracket_context?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 78

def self.thac0_bracket_context?(node)
  thac0_row_context?(node) || thac0_table_context?(node)
end

.thac0_row_context?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 60

def self.thac0_row_context?(node)
  tr = node.ancestors.find { |a| a.element? && a.name == "tr" }
  tr && tr.text.match?(THAC0_WORD_RE)
end

.thac0_table_context?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 65

def self.thac0_table_context?(node)
  return false unless node.ancestors.any? { |a| a.element? && a.name == "td" }

  table = node.ancestors.find { |a| a.element? && a.name == "table" }
  return false unless table

  caption = table.at_css("caption")
  return true if caption&.text&.match?(THAC0_WORD_RE)

  first_row = table.at_css("tr")
  first_row && first_row.text.match?(THAC0_WORD_RE)
end