summaryrefslogtreecommitdiff
path: root/lib/rdoc/markup/formatter.rb
blob: 197ff003e3e85acb152edb7eb54488c519d1a357 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
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
146
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
198
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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
# frozen_string_literal: false
##
# Base class for RDoc markup formatters
#
# Formatters are a visitor that converts an RDoc::Markup tree (from a comment)
# into some kind of output.  RDoc ships with formatters for converting back to
# rdoc, ANSI text, HTML, a Table of Contents and other formats.
#
# If you'd like to write your own Formatter use
# RDoc::Markup::FormatterTestCase.  If you're writing a text-output formatter
# use RDoc::Markup::TextFormatterTestCase which provides extra test cases.

class RDoc::Markup::Formatter

  ##
  # Tag for inline markup containing a +bit+ for the bitmask and the +on+ and
  # +off+ triggers.

  InlineTag = Struct.new(:bit, :on, :off)

  ##
  # Converts a target url to one that is relative to a given path

  def self.gen_relative_url path, target
    from        = File.dirname path
    to, to_file = File.split target

    from = from.split "/"
    to   = to.split "/"

    from.delete '.'
    to.delete '.'

    while from.size > 0 and to.size > 0 and from[0] == to[0] do
      from.shift
      to.shift
    end

    from.fill ".."
    from.concat to
    from << to_file
    File.join(*from)
  end

  ##
  # Creates a new Formatter

  def initialize options, markup = nil
    @options = options

    @markup = markup || RDoc::Markup.new
    @am     = @markup.attribute_manager
    @am.add_special(/<br>/, :HARD_BREAK)

    @attributes = @am.attributes

    @attr_tags = []

    @in_tt = 0
    @tt_bit = @attributes.bitmap_for :TT

    @hard_break = ''
    @from_path = '.'
  end

  ##
  # Adds +document+ to the output

  def accept_document document
    document.parts.each do |item|
      case item
      when RDoc::Markup::Document then # HACK
        accept_document item
      else
        item.accept self
      end
    end
  end

  ##
  # Adds a special for links of the form rdoc-...:

  def add_special_RDOCLINK
    @markup.add_special(/rdoc-[a-z]+:[^\s\]]+/, :RDOCLINK)
  end

  ##
  # Adds a special for links of the form {<text>}[<url>] and <word>[<url>]

  def add_special_TIDYLINK
    @markup.add_special(/(?:
                          \{.*?\} |    # multi-word label
                          \b[^\s{}]+? # single-word label
                         )

                         \[\S+?\]     # link target
                        /x, :TIDYLINK)
  end

  ##
  # Add a new set of tags for an attribute. We allow separate start and end
  # tags for flexibility

  def add_tag(name, start, stop)
    attr = @attributes.bitmap_for name
    @attr_tags << InlineTag.new(attr, start, stop)
  end

  ##
  # Allows +tag+ to be decorated with additional information.

  def annotate(tag)
    tag
  end

  ##
  # Marks up +content+

  def convert content
    @markup.convert content, self
  end

  ##
  # Converts flow items +flow+

  def convert_flow(flow)
    res = []

    flow.each do |item|
      case item
      when String then
        res << convert_string(item)
      when RDoc::Markup::AttrChanger then
        off_tags res, item
        on_tags res, item
      when RDoc::Markup::Special then
        res << convert_special(item)
      else
        raise "Unknown flow element: #{item.inspect}"
      end
    end

    res.join
  end

  ##
  # Converts added specials.  See RDoc::Markup#add_special

  def convert_special special
    return special.text if in_tt?

    handled = false

    @attributes.each_name_of special.type do |name|
      method_name = "handle_special_#{name}"

      if respond_to? method_name then
        special.text = send method_name, special
        handled = true
      end
    end

    unless handled then
      special_name = @attributes.as_string special.type

      raise RDoc::Error, "Unhandled special #{special_name}: #{special}"
    end

    special.text
  end

  ##
  # Converts a string to be fancier if desired

  def convert_string string
    string
  end

  ##
  # Use ignore in your subclass to ignore the content of a node.
  #
  #   ##
  #   # We don't support raw nodes in ToNoRaw
  #
  #   alias accept_raw ignore

  def ignore *node
  end

  ##
  # Are we currently inside tt tags?

  def in_tt?
    @in_tt > 0
  end

  ##
  # Turns on tags for +item+ on +res+

  def on_tags res, item
    attr_mask = item.turn_on
    return if attr_mask.zero?

    @attr_tags.each do |tag|
      if attr_mask & tag.bit != 0 then
        res << annotate(tag.on)
        @in_tt += 1 if tt? tag
      end
    end
  end

  ##
  # Turns off tags for +item+ on +res+

  def off_tags res, item
    attr_mask = item.turn_off
    return if attr_mask.zero?

    @attr_tags.reverse_each do |tag|
      if attr_mask & tag.bit != 0 then
        @in_tt -= 1 if tt? tag
        res << annotate(tag.off)
      end
    end
  end

  ##
  # Extracts and a scheme, url and an anchor id from +url+ and returns them.

  def parse_url url
    case url
    when /^rdoc-label:([^:]*)(?::(.*))?/ then
      scheme = 'link'
      path   = "##{$1}"
      id     = " id=\"#{$2}\"" if $2
    when /([A-Za-z]+):(.*)/ then
      scheme = $1.downcase
      path   = $2
    when /^#/ then
    else
      scheme = 'http'
      path   = url
      url    = url
    end

    if scheme == 'link' then
      url = if path[0, 1] == '#' then # is this meaningful?
              path
            else
              self.class.gen_relative_url @from_path, path
            end
    end

    [scheme, url, id]
  end

  ##
  # Is +tag+ a tt tag?

  def tt? tag
    tag.bit == @tt_bit
  end

end