Class: RDoc::Markup::PreProcess

Inherits:
Object
  • Object
show all
Defined in:
lib/rdoc/markup/pre_process.rb

Overview

Handle common directives that can occur in a block of text:

\:include: filename

Directives can be escaped by preceding them with a backslash.

RDoc plugin authors can register additional directives to be handled by using RDoc::Markup::PreProcess::register.

Any directive that is not built-in to RDoc (including those registered via plugins) will be stored in the metadata hash on the CodeObject the comment is attached to. See RDoc::Markup@Directives for the list of built-in directives.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input_file_name, include_path) ⇒ PreProcess

Creates a new pre-processor for input_file_name that will look for included files in include_path



77
78
79
80
81
 
# File 'lib/rdoc/markup/pre_process.rb', line 77

def initialize(input_file_name, include_path)
  @input_file_name = input_file_name
  @include_path = include_path
  @options = nil
end

Instance Attribute Details

#options ⇒ Object

An RDoc::Options instance that will be filled in with overrides from directives



22
23
24
 
# File 'lib/rdoc/markup/pre_process.rb', line 22

def options
  @options
end

Class Method Details

.post_process(&block) ⇒ Object

Adds a post-process handler for directives. The handler will be called with the result RDoc::Comment (or text String) and the code object for the comment (if any).



29
30
31
 
# File 'lib/rdoc/markup/pre_process.rb', line 29

def self.post_process &block
  @post_processors << block
end

.post_processors ⇒ Object

Registered post-processors



36
37
38
 
# File 'lib/rdoc/markup/pre_process.rb', line 36

def self.post_processors
  @post_processors
end

.register(directive, &block) ⇒ Object

Registers directive as one handled by RDoc. If a block is given the directive will be replaced by the result of the block, otherwise the directive will be removed from the processed text.

The block will be called with the directive name and the directive parameter:

RDoc::Markup::PreProcess.register 'my-directive' do |directive, param|
  # replace text, etc.
end



52
53
54
 
# File 'lib/rdoc/markup/pre_process.rb', line 52

def self.register directive, &block
  @registered[directive] = block
end

.registered ⇒ Object

Registered directives



59
60
61
 
# File 'lib/rdoc/markup/pre_process.rb', line 59

def self.registered
  @registered
end

.reset ⇒ Object

Clears all registered directives and post-processors



66
67
68
69
 
# File 'lib/rdoc/markup/pre_process.rb', line 66

def self.reset
  @post_processors = []
  @registered = {}
end

Instance Method Details

#find_include_file(name) ⇒ Object

Look for the given file in the directory containing the current file, and then in each of the directories specified in the RDOC_INCLUDE path



282
283
284
285
286
287
288
289
290
 
# File 'lib/rdoc/markup/pre_process.rb', line 282

def find_include_file(name)
  to_search = [File.dirname(@input_file_name)].concat @include_path
  to_search.each do |dir|
    full_name = File.join(dir, name)
    stat = File.stat(full_name) rescue next
    return full_name if stat.readable?
  end
  nil
end

#handle(text, code_object = nil, &block) ⇒ Object

Look for directives in the given text.

Options that we don’t handle are yielded. If the block returns false the directive is restored to the text. If the block returns nil or no block was given the directive is handled according to the registered directives. If a String was returned the directive is replaced with the string.

If no matching directive was registered the directive is restored to the text.

If code_object is given and the directive is unknown then the directive’s parameter is set as metadata on the code_object. See RDoc::CodeObject#metadata for details.



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
 
# File 'lib/rdoc/markup/pre_process.rb', line 98

def handle text, code_object = nil, &block
  if RDoc::Comment === text then
    comment = text
    text = text.text
  end

  encoding = text.encoding if defined?(Encoding)

  # regexp helper (square brackets for optional)
  # $1      $2  $3        $4      $5
  # [prefix][\]:directive:[spaces][param]newline
  text.gsub!(/^([ \t]*(?:#|\/?\*)?[ \t]*)(\\?):(\w+):([ \t]*)(.+)?(\r?\n|$)/) do
    # skip something like ':toto::'
    next $& if $4.empty? and $5 and $5[0, 1] == ':'

    # skip if escaped
    next "#$1:#$3:#$4#$5\n" unless $2.empty?

    # This is not in handle_directive because I didn't want to pass another
    # argument into it
    if comment and $3 == 'markup' then
      next "#{$1.strip}\n" unless $5
      comment.format = $5.downcase
      next "#{$1.strip}\n"
    end

    handle_directive $1, $3, $5, code_object, encoding, &block
  end

  comment = text unless comment

  self.class.post_processors.each do |handler|
    handler.call comment, code_object
  end

  text
end

#handle_directive(prefix, directive, param, code_object = nil, encoding = nil) ⇒ Object

Performs the actions described by directive and its parameter param.

code_object is used for directives that operate on a class or module. prefix is used to ensure the replacement for handled directives is correct. encoding is used for the include directive.

For a list of directives in RDoc see RDoc::Markup. – When 1.8.7 support is ditched prefix can be defaulted to ”



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
 
# File 'lib/rdoc/markup/pre_process.rb', line 147

def handle_directive prefix, directive, param, code_object = nil,
                     encoding = nil
  blankline = "#{prefix.strip}\n"
  directive = directive.downcase

  case directive
  when 'arg', 'args' then
    return blankline unless code_object

    code_object.params = param

    blankline
  when 'category' then
    if RDoc::Context === code_object then
      section = code_object.add_section param
      code_object.temporary_section = section
    end

    blankline # ignore category if we're not on an RDoc::Context
  when 'doc' then
    return blankline unless code_object
    code_object.document_self = true
    code_object.force_documentation = true

    blankline
  when 'enddoc' then
    return blankline unless code_object
    code_object.done_documenting = true

    blankline
  when 'include' then
    filename = param.split.first
    include_file filename, prefix, encoding
  when 'main' then
    @options.main_page = param if @options.respond_to? :main_page

    blankline
  when 'nodoc' then
    return blankline unless code_object
    code_object.document_self = nil # notify nodoc
    code_object.document_children = param !~ /all/i

    blankline
  when 'notnew', 'not_new', 'not-new' then
    return blankline unless RDoc::AnyMethod === code_object

    code_object.dont_rename_initialize = true

    blankline
  when 'startdoc' then
    return blankline unless code_object

    code_object.start_doc
    code_object.force_documentation = true

    blankline
  when 'stopdoc' then
    return blankline unless code_object

    code_object.stop_doc

    blankline
  when 'title' then
    @options.default_title = param if @options.respond_to? :default_title=

    blankline
  when 'yield', 'yields' then
    return blankline unless code_object
    # remove parameter &block
    code_object.params.sub!(/,?\s*&\w+/, '') if code_object.params

    code_object.block_params = param

    blankline
  else
    result = yield directive, param if block_given?

    case result
    when nil then
      code_object.metadata[directive] = param if code_object

      if RDoc::Markup::PreProcess.registered.include? directive then
        handler = RDoc::Markup::PreProcess.registered[directive]
        result = handler.call directive, param if handler
      else
        result = "#{prefix}:#{directive}: #{param}\n"
      end
    when false then
      result = "#{prefix}:#{directive}: #{param}\n"
    end

    result
  end
end

#include_file(name, indent, encoding) ⇒ Object

Handles the :include: filename directive.

If the first line of the included file starts with ‘#’, and contains an encoding information in the form ‘coding:’ or ‘coding=’, it is removed.

If all lines in the included file start with a ‘#’, this leading ‘#’ is removed before inclusion. The included content is indented like the :include: directive. – so all content will be verbatim because of the likely space after ‘#’? TODO shift left the whole file content in that case TODO comment stop/start #– and #++ in included file must be processed here



257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
 
# File 'lib/rdoc/markup/pre_process.rb', line 257

def include_file name, indent, encoding
  full_name = find_include_file name

  unless full_name then
    warn "Couldn't find file to include '#{name}' from #{@input_file_name}"
    return ''
  end

  content = RDoc::Encoding.read_file full_name, encoding, true

  # strip magic comment
  content = content.sub(/\A# .*coding[=:].*$/, '').lstrip

  # strip leading '#'s, but only if all lines start with them
  if content =~ /^[^#]/ then
    content.gsub(/^/, indent)
  else
    content.gsub(/^#?/, indent)
  end
end