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
CHANCE_RE = 
/
  (?<![A-Za-z0-9_])
  \d{1,3}
  \s*-\s*in\s*-\s*
  \d{1,4}
  (?![A-Za-z0-9_])
/ix
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 



90
91
92
93
94
95
96
97
98
99
100
 
# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 90

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 



59
60
61
62
63
64
65
66
 
# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 59

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 



102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
 
# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 102

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, CHANCE_RE).each do
    m = Regexp.last_match
    matches << {
      start: m.begin(0),
      end: m.end(0),
      expr: m[0].gsub(/\s+/, ""),
      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 



199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
 
# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 199

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 



147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
 
# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 147

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) 


86
87
88
 
# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 86

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

.thac0_row_context?(node) ⇒ Boolean

Returns:

  • (Boolean) 


68
69
70
71
 
# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 68

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) 


73
74
75
76
77
78
79
80
81
82
83
84
 
# File 'lib/jekyll/dice_tray/html_rewriter.rb', line 73

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