Module: RDoc::Text

Overview

Methods for manipulating comment text

Constant Summary collapse

MARKUP_FORMAT =

Maps markup formats to classes that can parse them. If the format is unknown, “rdoc” format is used.

{
  'markdown' => RDoc::Markdown,
  'rdoc'     => RDoc::Markup,
  'rd'       => RDoc::RD,
  'tomdoc'   => RDoc::TomDoc,
}
TO_HTML_CHARACTERS =

Maps an encoding to a Hash of characters properly transcoded for that encoding.

See also encode_fallback.

Hash.new do |h, encoding|
  h[encoding] = {
    :close_dquote => encode_fallback('', encoding, '"'),
    :close_squote => encode_fallback('', encoding, '\''),
    :copyright    => encode_fallback('©', encoding, '(c)'),
    :ellipsis     => encode_fallback('', encoding, '...'),
    :em_dash      => encode_fallback('', encoding, '---'),
    :en_dash      => encode_fallback('', encoding, '--'),
    :open_dquote  => encode_fallback('', encoding, '"'),
    :open_squote  => encode_fallback('', encoding, '\''),
    :trademark    => encode_fallback('®', encoding, '(r)'),
  }
end

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.encode_fallback(character, encoding, fallback) ⇒ Object

Transcodes character to encoding with a fallback character.



59
60
61
62
# File 'lib/rdoc/text.rb', line 59

def self.encode_fallback character, encoding, fallback
  character.encode(encoding, :fallback => { character => fallback },
                   :undef => :replace, :replace => fallback)
end

Instance Method Details

#expand_tabs(text) ⇒ Object

Expands tab characters in text to eight spaces



67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
# File 'lib/rdoc/text.rb', line 67

def expand_tabs text
  expanded = []

  text.each_line do |line|
    nil while line.gsub!(/(?:\G|\r)((?:.{8})*?)([^\t\r\n]{0,7})\t/) do
      r = "#{$1}#{$2}#{' ' * (8 - $2.size)}"
      r.force_encoding text.encoding if Object.const_defined? :Encoding
      r
    end

    expanded << line
  end

  expanded.join
end

#flush_left(text) ⇒ Object

Flush text left based on the shortest line



86
87
88
89
90
91
92
93
94
95
96
97
98
# File 'lib/rdoc/text.rb', line 86

def flush_left text
  indent = 9999

  text.each_line do |line|
    line_indent = line =~ /\S/ || 9999
    indent = line_indent if indent > line_indent
  end

  empty = ''
  empty.force_encoding text.encoding if Object.const_defined? :Encoding

  text.gsub(/^ {0,#{indent}}/, empty)
end

#markup(text) ⇒ Object

Convert a string in markup format into HTML.

Requires the including class to implement #formatter



105
106
107
108
109
110
111
112
113
114
115
116
# File 'lib/rdoc/text.rb', line 105

def markup text
  if @store.rdoc.options
    locale = @store.rdoc.options.locale
  else
    locale = nil
  end
  if locale
    i18n_text = RDoc::I18n::Text.new(text)
    text = i18n_text.translate(locale)
  end
  parse(text).accept formatter
end

#normalize_comment(text) ⇒ Object

Strips hashes, expands tabs then flushes text to the left



121
122
123
124
125
126
127
128
129
130
# File 'lib/rdoc/text.rb', line 121

def normalize_comment text
  return text if text.empty?

  text = strip_stars    text
  text = strip_hashes   text
  text = expand_tabs    text
  text = flush_left     text
  text = strip_newlines text
  text
end

#parse(text, format = 'rdoc') ⇒ Object

Normalizes text then builds a RDoc::Markup::Document from it



135
136
137
138
139
140
141
142
143
144
# File 'lib/rdoc/text.rb', line 135

def parse text, format = 'rdoc'
  return text if RDoc::Markup::Document === text
  return text.parse if RDoc::Comment === text

  text = normalize_comment text # TODO remove, should not be necessary

  return RDoc::Markup::Document.new if text =~ /\A\n*\z/

  MARKUP_FORMAT[format].parse text
end

#snippet(text, limit = 100) ⇒ Object

The first limit characters of text as HTML



149
150
151
152
153
# File 'lib/rdoc/text.rb', line 149

def snippet text, limit = 100
  document = parse text

  RDoc::Markup::ToHtmlSnippet.new(options, limit).convert document
end

#strip_hashes(text) ⇒ Object

Strips leading # characters from text



158
159
160
161
162
163
164
165
# File 'lib/rdoc/text.rb', line 158

def strip_hashes text
  return text if text =~ /^(?>\s*)[^\#]/

  empty = ''
  empty.force_encoding text.encoding if Object.const_defined? :Encoding

  text.gsub(/^\s*(#+)/) { $1.tr '#', ' ' }.gsub(/^\s+$/, empty)
end

#strip_newlines(text) ⇒ Object

Strips leading and trailing n characters from text



170
171
172
# File 'lib/rdoc/text.rb', line 170

def strip_newlines text
  text.gsub(/\A\n*(.*?)\n*\z/m) do $1 end # block preserves String encoding
end

#strip_stars(text) ⇒ Object

Strips /* */ style comments



177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
# File 'lib/rdoc/text.rb', line 177

def strip_stars text
  return text unless text =~ %r%/\*.*\*/%m

  encoding = text.encoding if Object.const_defined? :Encoding

  text = text.gsub %r%Document-method:\s+[\w:.#=!?]+%, ''

  space = ' '
  space.force_encoding encoding if encoding

  text.sub!  %r%/\*+%       do space * $&.length end
  text.sub!  %r%\*+/%       do space * $&.length end
  text.gsub! %r%^[ \t]*\*%m do space * $&.length end

  empty = ''
  empty.force_encoding encoding if encoding
  text.gsub(/^\s+$/, empty)
end

#to_html(text) ⇒ Object

Converts ampersand, dashes, ellipsis, quotes, copyright and registered trademark symbols in text to properly encoded characters.



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
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
# File 'lib/rdoc/text.rb', line 200

def to_html text
  if Object.const_defined? :Encoding then
    html = ''.encode text.encoding

    encoded = RDoc::Text::TO_HTML_CHARACTERS[text.encoding]
  else
    html = ''
    encoded = {
      :close_dquote => '',
      :close_squote => '',
      :copyright    => '©',
      :ellipsis     => '',
      :em_dash      => '',
      :en_dash      => '',
      :open_dquote  => '',
      :open_squote  => '',
      :trademark    => '®',
    }
  end

  s = StringScanner.new text
  insquotes = false
  indquotes = false
  after_word = nil

  until s.eos? do
    case
    when s.scan(/<(tt|code)>.*?<\/\1>/) then # skip contents of tt
      html << s.matched.gsub('\\\\', '\\')
    when s.scan(/<(tt|code)>.*?/) then
      warn "mismatched <#{s[1]}> tag" # TODO signal file/line
      html << s.matched
    when s.scan(/<[^>]+\/?s*>/) then # skip HTML tags
      html << s.matched
    when s.scan(/\\(\S)/) then # unhandled suppressed crossref
      html << s[1]
      after_word = nil
    when s.scan(/\.\.\.(\.?)/) then
      html << s[1] << encoded[:ellipsis]
      after_word = nil
    when s.scan(/\(c\)/) then
      html << encoded[:copyright]
      after_word = nil
    when s.scan(/\(r\)/) then
      html << encoded[:trademark]
      after_word = nil
    when s.scan(/---/) then
      html << encoded[:em_dash]
      after_word = nil
    when s.scan(/--/) then
      html << encoded[:en_dash]
      after_word = nil
    when s.scan(/&quot;|"/) then
      html << encoded[indquotes ? :close_dquote : :open_dquote]
      indquotes = !indquotes
      after_word = nil
    when s.scan(/``/) then # backtick double quote
      html << encoded[:open_dquote]
      after_word = nil
    when s.scan(/''/) then # tick double quote
      html << encoded[:close_dquote]
      after_word = nil
    when s.scan(/'/) then # single quote
      if insquotes
        html << encoded[:close_squote]
        insquotes = false
      elsif after_word
        # Mary's dog, my parents' house: do not start paired quotes
        html << encoded[:close_squote]
      else
        html << encoded[:open_squote]
        insquotes = true
      end

      after_word = nil
    else # advance to the next potentially significant character
      match = s.scan(/.+?(?=[<\\.("'`&-])/) #"

      if match then
        html << match
        after_word = match =~ /\w$/
      else
        html << s.rest
        break
      end
    end
  end

  html
end

#wrap(txt, line_len = 76) ⇒ Object

Wraps txt to line_len



294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
# File 'lib/rdoc/text.rb', line 294

def wrap(txt, line_len = 76)
  res = []
  sp = 0
  ep = txt.length

  while sp < ep
    # scan back for a space
    p = sp + line_len - 1
    if p >= ep
      p = ep
    else
      while p > sp and txt[p] != ?\s
        p -= 1
      end
      if p <= sp
        p = sp + line_len
        while p < ep and txt[p] != ?\s
          p += 1
        end
      end
    end
    res << txt[sp...p] << "\n"
    sp = p
    sp += 1 while sp < ep and txt[sp] == ?\s
  end

  res.join.strip
end