Class: RDoc::Parser::C

Inherits:
RDoc::Parser show all
Includes:
Text
Defined in:
lib/rdoc/parser/c.rb

Overview

RDoc::Parser::C attempts to parse C extension files. It looks for the standard patterns that you find in extensions: rb_define_class, rb_define_method and so on. It tries to find the corresponding C source for the methods and extract comments, but if we fail we don’t worry too much.

The comments associated with a Ruby method are extracted from the C comment block associated with the routine that implements that method, that is to say the method whose name is given in the rb_define_method call. For example, you might write:

/*
 * Returns a new array that is a one-dimensional flattening of this
 * array (recursively). That is, for every element that is an array,
 * extract its elements into the new array.
 *
 *    s = [ 1, 2, 3 ]           #=> [1, 2, 3]
 *    t = [ 4, 5, 6, [7, 8] ]   #=> [4, 5, 6, [7, 8]]
 *    a = [ s, t, 9, 10 ]       #=> [[1, 2, 3], [4, 5, 6, [7, 8]], 9, 10]
 *    a.flatten                 #=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
 */
 static VALUE
 rb_ary_flatten(VALUE ary)
 {
     ary = rb_obj_dup(ary);
     rb_ary_flatten_bang(ary);
     return ary;
 }

 ...

 void
 Init_Array(void)
 {
   ...
   rb_define_method(rb_cArray, "flatten", rb_ary_flatten, 0);

Here RDoc will determine from the rb_define_method line that there’s a method called “flatten” in class Array, and will look for the implementation in the method rb_ary_flatten. It will then use the comment from that method in the HTML output. This method must be in the same source file as the rb_define_method.

The comment blocks may include special directives:

Document-class: name

Documentation for the named class.

Document-module: name

Documentation for the named module.

Document-const: name

Documentation for the named rb_define_const.

Constant values can be supplied on the first line of the comment like so:

/* 300: The highest possible score in bowling */
rb_define_const(cFoo, "PERFECT", INT2FIX(300));

The value can contain internal colons so long as they are escaped with a \

Document-global: name

Documentation for the named rb_define_global_const

Document-variable: name

Documentation for the named rb_define_variable

Document-method: method_name

Documentation for the named method. Use this when the method name is unambiguous.

Document-method: ClassName::method_name

Documentation for a singleton method in the given class. Use this when the method name alone is ambiguous.

Document-method: ClassName#method_name

Documentation for a instance method in the given class. Use this when the method name alone is ambiguous.

Document-attr: name

Documentation for the named attribute.

call-seq: text up to an empty line

Because C source doesn’t give descriptive names to Ruby-level parameters, you need to document the calling sequence explicitly

In addition, RDoc assumes by default that the C method implementing a Ruby function is in the same source file as the rb_define_method call. If this isn’t the case, add the comment:

rb_define_method(....);  // in filename

As an example, we might have an extension that defines multiple classes in its Init_xxx method. We could document them using

/*
 * Document-class:  MyClass
 *
 * Encapsulate the writing and reading of the configuration
 * file. ...
 */

/*
 * Document-method: read_value
 *
 * call-seq:
 *   cfg.read_value(key)            -> value
 *   cfg.read_value(key} { |key| }  -> value
 *
 * Return the value corresponding to +key+ from the configuration.
 * In the second form, if the key isn't found, invoke the
 * block and return its value.
 */

Constant Summary collapse

BOOL_ARG_PATTERN =

:stopdoc:

/\s*+\b([01]|Q?(?:true|false)|TRUE|FALSE)\b\s*/
TRUE_VALUES = 
['1', 'TRUE', 'true', 'Qtrue'].freeze

Constants included from Text

Text::MARKUP_FORMAT, Text::SPACE_SEPARATED_LETTER_CLASS, Text::TO_HTML_CHARACTERS

Instance Attribute Summary collapse

Attributes included from Text

#language

Attributes inherited from RDoc::Parser

#file_name

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Text

encode_fallback, #expand_tabs, #flush_left, #markup, #normalize_comment, #parse, #snippet, #strip_hashes, #strip_newlines, #strip_stars, #to_html, #wrap

Methods inherited from RDoc::Parser

alias_extension, binary?, can_parse, can_parse_by_name, check_modeline, for, #handle_tab_width, parse_files_matching, remove_modeline, use_markup, zip?

Constructor Details

#initialize(top_level, file_name, content, options, stats) ⇒ C

Prepares for parsing a C file. See RDoc::Parser#initialize for details on the arguments.



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
 
# File 'lib/rdoc/parser/c.rb', line 171

def initialize top_level, file_name, content, options, stats
  super

  @known_classes = RDoc::KNOWN_CLASSES.dup
  @content = handle_tab_width handle_ifdefs_in @content
  @file_dir = File.dirname @file_name

  @classes           = load_variable_map :c_class_variables
  @singleton_classes = load_variable_map :c_singleton_class_variables

  @markup = @options.markup

  # class_variable => { function => [method, ...] }
  @methods = Hash.new { |h, f| h[f] = Hash.new { |i, m| i[m] = [] } }

  # missing variable => [handle_class_module arguments]
  @missing_dependencies = {}

  # missing enclosure variable => [dependent handle_class_module arguments]
  @enclosure_dependencies = Hash.new { |h, k| h[k] = [] }
  @enclosure_dependencies.instance_variable_set :@missing_dependencies,
                                                @missing_dependencies

  @enclosure_dependencies.extend TSort

  def @enclosure_dependencies.tsort_each_node &block
    each_key(&block)
  rescue TSort::Cyclic => e
    cycle_vars = e.message.scan(/"(.*?)"/).flatten

    cycle = cycle_vars.sort.map do |var_name|
      delete var_name

      var_name, type, mod_name, = @missing_dependencies[var_name]

      "#{type} #{mod_name} (#{var_name})"
    end.join ', '

    warn "Unable to create #{cycle} due to a cyclic class or module creation"

    retry
  end

  def @enclosure_dependencies.tsort_each_child node, &block
    fetch(node, []).each(&block)
  end
end

Instance Attribute Details

#classes ⇒ Object (readonly)

Maps C variable names to names of Ruby classes or modules



133
134
135
 
# File 'lib/rdoc/parser/c.rb', line 133

def classes
  @classes
end

#content ⇒ Object

C file the parser is parsing



138
139
140
 
# File 'lib/rdoc/parser/c.rb', line 138

def content
  @content
end

#enclosure_dependencies ⇒ Object (readonly)

Dependencies from a missing enclosing class to the classes in missing_dependencies that depend upon it.



144
145
146
 
# File 'lib/rdoc/parser/c.rb', line 144

def enclosure_dependencies
  @enclosure_dependencies
end

#known_classes ⇒ Object (readonly)

Maps C variable names to names of Ruby classes (and singleton classes)



149
150
151
 
# File 'lib/rdoc/parser/c.rb', line 149

def known_classes
  @known_classes
end

#missing_dependencies ⇒ Object (readonly)

Classes found while parsing the C file that were not yet registered due to a missing enclosing class. These are processed by do_missing



155
156
157
 
# File 'lib/rdoc/parser/c.rb', line 155

def missing_dependencies
  @missing_dependencies
end

#singleton_classes ⇒ Object (readonly)

Maps C variable names to names of Ruby singleton classes



160
161
162
 
# File 'lib/rdoc/parser/c.rb', line 160

def singleton_classes
  @singleton_classes
end

#top_level ⇒ Object (readonly)

The TopLevel items in the parsed file belong to



165
166
167
 
# File 'lib/rdoc/parser/c.rb', line 165

def top_level
  @top_level
end

Class Method Details

.tsort_each_child(node, &block) ⇒ Object 



214
215
216
 
# File 'lib/rdoc/parser/c.rb', line 214

def @enclosure_dependencies.tsort_each_child node, &block
  fetch(node, []).each(&block)
end

.tsort_each_node(&block) ⇒ Object 



196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
 
# File 'lib/rdoc/parser/c.rb', line 196

def @enclosure_dependencies.tsort_each_node &block
  each_key(&block)
rescue TSort::Cyclic => e
  cycle_vars = e.message.scan(/"(.*?)"/).flatten

  cycle = cycle_vars.sort.map do |var_name|
    delete var_name

    var_name, type, mod_name, = @missing_dependencies[var_name]

    "#{type} #{mod_name} (#{var_name})"
  end.join ', '

  warn "Unable to create #{cycle} due to a cyclic class or module creation"

  retry
end

Instance Method Details

#add_alias(var_name, class_obj, old_name, new_name, comment) ⇒ Object

Add alias, either from a direct alias definition, or from two method that reference the same function.



250
251
252
253
254
255
256
257
258
 
# File 'lib/rdoc/parser/c.rb', line 250

def add_alias(var_name, class_obj, old_name, new_name, comment)
  al = RDoc::Alias.new '', old_name, new_name, ''
  al.singleton = @singleton_classes.key? var_name
  al.comment = comment
  al.record_location @top_level
  class_obj.add_alias al
  @stats.add_alias al
  al
end

#do_aliases ⇒ Object

Scans #content for rb_define_alias



222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
 
# File 'lib/rdoc/parser/c.rb', line 222

def do_aliases
  @content.scan(/rb_define_alias\s*\(
                 \s*(\w+),
                 \s*"(.+?)",
                 \s*"(.+?)"
                 \s*\)/xm) do |var_name, new_name, old_name|
    class_name = @known_classes[var_name]

    unless class_name then
      @options.warn "Enclosing class or module %p for alias %s %s is not known" % [
        var_name, new_name, old_name]
      next
    end

    class_obj = find_class var_name, class_name
    comment = find_alias_comment var_name, new_name, old_name
    comment.normalize
    if comment.to_s.empty? and existing_method = class_obj.method_list.find { |m| m.name == old_name}
      comment = existing_method.comment
    end
    add_alias(var_name, class_obj, old_name, new_name, comment)
  end
end

#do_attrs ⇒ Object

Scans #content for rb_attr and rb_define_attr



263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
 
# File 'lib/rdoc/parser/c.rb', line 263

def do_attrs
  @content.scan(/rb_attr\s*\(
                 \s*(\w+),
                 \s*([\w"()]+),
                 #{BOOL_ARG_PATTERN},
                 #{BOOL_ARG_PATTERN},
                 \s*\w+\);/xmo) do |var_name, attr_name, read, write|
    handle_attr var_name, attr_name, read, write
  end

  @content.scan(%r%rb_define_attr\(
                           \s*([\w\.]+),
                           \s*"([^"]+)",
                           #{BOOL_ARG_PATTERN},
                           #{BOOL_ARG_PATTERN}\);
              %xmo) do |var_name, attr_name, read, write|
    handle_attr var_name, attr_name, read, write
  end
end

#do_boot_defclass ⇒ Object

Scans #content for boot_defclass



286
287
288
289
290
291
292
 
# File 'lib/rdoc/parser/c.rb', line 286

def do_boot_defclass
  @content.scan(/(\w+)\s*=\s*boot_defclass\s*\(\s*"(\w+?)",\s*(\w+?)\s*\)/) do
    |var_name, class_name, parent|
    parent = nil if parent == "0"
    handle_class_module(var_name, :class, class_name, parent, nil)
  end
end

#do_classes_and_modules ⇒ Object

Scans #content for rb_define_class, boot_defclass, rb_define_class_under and rb_singleton_class



298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
 
# File 'lib/rdoc/parser/c.rb', line 298

def do_classes_and_modules
  do_boot_defclass if @file_name == "class.c"

  @content.scan(
    %r(
      (?<open>\s*\(\s*) {0}
      (?<close>\s*\)\s*) {0}
      (?<name>\s*"(?<class_name>\w+)") {0}
      (?<parent>\s*(?:
        (?<parent_name>[\w\*\s\(\)\.\->]+) |
        rb_path2class\s*\(\s*"(?<path>[\w:]+)"\s*\)
      )) {0}
      (?<under>\w+) {0}

      (?<var_name>[\w\.]+)\s* =
      \s*rb_(?:
        define_(?:
          class(?: # rb_define_class(name, parent_name)
            \(\s*
              \g<name>,
              \g<parent>
            \s*\)
          |
            _under\g<open> # rb_define_class_under(under, name, parent_name...)
              \g<under>,
              \g<name>,
              \g<parent>
            \g<close>
          )
        |
          (?<module>)
          module(?: # rb_define_module(name)
            \g<open>
              \g<name>
            \g<close>
          |
            _under\g<open> # rb_define_module_under(under, name)
              \g<under>,
              \g<name>
            \g<close>
          )
        )
    |
      (?<attributes>(?:\s*"\w+",)*\s*NULL\s*) {0}
      struct_define(?:
        \g<open> # rb_struct_define(name, ...)
          \g<name>,
      |
        _under\g<open> # rb_struct_define_under(under, name, ...)
          \g<under>,
          \g<name>,
      |
        _without_accessor(?:
          \g<open> # rb_struct_define_without_accessor(name, parent_name, ...)
        |
          _under\g<open> # rb_struct_define_without_accessor_under(under, name, parent_name, ...)
            \g<under>,
        )
          \g<name>,
          \g<parent>,
          \s*\w+,        # Allocation function
      )
        \g<attributes>
      \g<close>
    |
      singleton_class\g<open> # rb_singleton_class(target_class_name)
        (?<target_class_name>\w+)
      \g<close>
      )
    )mx
  ) do
    if target_class_name = $~[:target_class_name]
      # rb_singleton_class(target_class_name)
      handle_singleton $~[:var_name], target_class_name
      next
    end

    var_name = $~[:var_name]
    type = $~[:module] ? :module : :class
    class_name = $~[:class_name]
    parent_name = $~[:parent_name] || $~[:path]
    under = $~[:under]
    attributes = $~[:attributes]

    handle_class_module(var_name, type, class_name, parent_name, under)
    if attributes and !parent_name # rb_struct_define *not* without_accessor
      true_flag = 'Qtrue'
      attributes.scan(/"\K\w+(?=")/) do |attr_name|
        handle_attr var_name, attr_name, true_flag, true_flag
      end
    end
  end
end

#do_constants ⇒ Object

Scans #content for rb_define_variable, rb_define_readonly_variable, rb_define_const and rb_define_global_const



396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
 
# File 'lib/rdoc/parser/c.rb', line 396

def do_constants
  @content.scan(%r%\Wrb_define_
                 ( variable          |
                   readonly_variable |
                   const             |
                   global_const        )
             \s*\(
               (?:\s*(\w+),)?
               \s*"(\w+)",
               \s*(.*?)\s*\)\s*;
               %xm) do |type, var_name, const_name, definition|
    var_name = "rb_cObject" if !var_name or var_name == "rb_mKernel"
    handle_constants type, var_name, const_name, definition
  end

  @content.scan(%r%
                \Wrb_curses_define_const
                \s*\(
                  \s*
                  (\w+)
                  \s*
                \)
                \s*;%xm) do |consts|
    const = consts.first

    handle_constants 'const', 'mCurses', const, "UINT2NUM(#{const})"
  end

  @content.scan(%r%
                \Wrb_file_const
                \s*\(
                  \s*
                  "([^"]+)",
                  \s*
                  (.*?)
                  \s*
                \)
                \s*;%xm) do |name, value|
    handle_constants 'const', 'rb_mFConst', name, value
  end
end

#do_includes ⇒ Object

Scans #content for rb_include_module



442
443
444
445
446
447
448
449
450
451
 
# File 'lib/rdoc/parser/c.rb', line 442

def do_includes
  @content.scan(/rb_include_module\s*\(\s*(\w+?),\s*(\w+?)\s*\)/) do |c,m|
    next unless cls = @classes[c]
    m = @known_classes[m] || m

    comment = new_comment '', @top_level, :c
    incl = cls.add_include RDoc::Include.new(m, comment)
    incl.record_location @top_level
  end
end

#do_methods ⇒ Object

Scans #content for rb_define_method, rb_define_singleton_method, rb_define_module_function, rb_define_private_method, rb_define_global_function and define_filetest_function



458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
 
# File 'lib/rdoc/parser/c.rb', line 458

def do_methods
  @content.scan(%r%rb_define_
                 (
                    singleton_method |
                    method           |
                    module_function  |
                    private_method
                 )
                 \s*\(\s*([\w\.]+),
                   \s*"([^"]+)",
                   \s*(?:RUBY_METHOD_FUNC\(|VALUEFUNC\(|\(METHOD\))?(\w+)\)?,
                   \s*(-?\w+)\s*\)
                 (?:;\s*/[*/]\s+in\s+(\w+?\.(?:cpp|c|y)))?
               %xm) do |type, var_name, meth_name, function, param_count, source_file|

    # Ignore top-object and weird struct.c dynamic stuff
    next if var_name == "ruby_top_self"
    next if var_name == "nstr"

    var_name = "rb_cObject" if var_name == "rb_mKernel"
    handle_method(type, var_name, meth_name, function, param_count,
                  source_file)
  end

  @content.scan(%r%rb_define_global_function\s*\(
                           \s*"([^"]+)",
                           \s*(?:RUBY_METHOD_FUNC\(|VALUEFUNC\()?(\w+)\)?,
                           \s*(-?\w+)\s*\)
              (?:;\s*/[*/]\s+in\s+(\w+?\.[cy]))?
              %xm) do |meth_name, function, param_count, source_file|
    handle_method("method", "rb_mKernel", meth_name, function, param_count,
                  source_file)
  end

  @content.scan(/define_filetest_function\s*\(
                   \s*"([^"]+)",
                   \s*(?:RUBY_METHOD_FUNC\(|VALUEFUNC\()?(\w+)\)?,
                   \s*(-?\w+)\s*\)/xm) do |meth_name, function, param_count|

    handle_method("method", "rb_mFileTest", meth_name, function, param_count)
    handle_method("singleton_method", "rb_cFile", meth_name, function,
                  param_count)
  end
end

#do_missing ⇒ Object

Creates classes and module that were missing were defined due to the file order being different than the declaration order.



507
508
509
510
511
512
513
514
515
516
517
 
# File 'lib/rdoc/parser/c.rb', line 507

def do_missing
  return if @missing_dependencies.empty?

  @enclosure_dependencies.tsort.each do |in_module|
    arguments = @missing_dependencies.delete in_module

    next unless arguments # dependency on existing class

    handle_class_module(*arguments)
  end
end

#find_alias_comment(class_name, new_name, old_name) ⇒ Object

Finds the comment for an alias on class_name from new_name to old_name



523
524
525
526
527
528
529
530
 
# File 'lib/rdoc/parser/c.rb', line 523

def find_alias_comment class_name, new_name, old_name
  content =~ %r%((?>/\*.*?\*/\s+))
                rb_define_alias\(\s*#{Regexp.escape class_name}\s*,
                                 \s*"#{Regexp.escape new_name}"\s*,
                                 \s*"#{Regexp.escape old_name}"\s*\);%xm

  new_comment($1 || '', @top_level, :c)
end

#find_attr_comment(var_name, attr_name, read = nil, write = nil) ⇒ Object

Finds a comment for rb_define_attr, rb_attr or Document-attr.

var_name is the C class variable the attribute is defined on. attr_name is the attribute’s name.

read and write are the read/write flags (‘1’ or ‘0’). Either both or neither must be provided.



541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
 
# File 'lib/rdoc/parser/c.rb', line 541

def find_attr_comment var_name, attr_name, read = nil, write = nil
  attr_name = Regexp.escape attr_name

  rw = if read and write then
         /\s*#{read}\s*,\s*#{write}\s*/xm
       else
         /.*?/m
       end

  comment = if @content =~ %r%((?>/\*.*?\*/\s+))
                              rb_define_attr\((?:\s*#{var_name},)?\s*
                                              "#{attr_name}"\s*,
                                              #{rw}\)\s*;%xm then
              $1
            elsif @content =~ %r%((?>/\*.*?\*/\s+))
                                 rb_attr\(\s*#{var_name}\s*,
                                          \s*#{attr_name}\s*,
                                          #{rw},.*?\)\s*;%xm then
              $1
            elsif @content =~ %r%(/\*.*?(?:\s*\*\s*)?)
                                 Document-attr:\s#{attr_name}\s*?\n
                                 ((?>(.|\n)*?\*/))%x then
              "#{$1}\n#{$2}"
            else
              ''
            end

  new_comment comment, @top_level, :c
end

#find_body(class_name, meth_name, meth_obj, file_content, quiet = false) ⇒ Object

Find the C code corresponding to a Ruby method



598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
 
# File 'lib/rdoc/parser/c.rb', line 598

def find_body class_name, meth_name, meth_obj, file_content, quiet = false
  if file_content
    @body_table ||= {}
    @body_table[file_content] ||= gen_body_table file_content
    type, *args = @body_table[file_content][meth_name]
  end

  case type
  when :func_def
    comment = new_comment args[0], @top_level, :c
    body = args[1]
    offset, = args[2]

    comment.remove_private if comment

    # try to find the whole body
    body = $& if /#{Regexp.escape body}[^(]*?\{.*?^\}/m =~ file_content

    # The comment block may have been overridden with a 'Document-method'
    # block. This happens in the interpreter when multiple methods are
    # vectored through to the same C method but those methods are logically
    # distinct (for example Kernel.hash and Kernel.object_id share the same
    # implementation

    override_comment = find_override_comment class_name, meth_obj
    comment = override_comment if override_comment

    comment.normalize
    find_modifiers comment, meth_obj if comment

    #meth_obj.params = params
    meth_obj.start_collecting_tokens
    tk = { :line_no => 1, :char_no => 1, :text => body }
    meth_obj.add_token tk
    meth_obj.comment = comment
    meth_obj.line    = file_content[0, offset].count("\n") + 1

    body
  when :macro_def
    comment = new_comment args[0], @top_level, :c
    body = args[1]
    offset, = args[2]

    find_body class_name, args[3], meth_obj, file_content, true

    comment.normalize
    find_modifiers comment, meth_obj

    meth_obj.start_collecting_tokens
    tk = { :line_no => 1, :char_no => 1, :text => body }
    meth_obj.add_token tk
    meth_obj.comment = comment
    meth_obj.line    = file_content[0, offset].count("\n") + 1

    body
  when :macro_alias
    # with no comment we hope the aliased definition has it and use it's
    # definition

    body = find_body(class_name, args[0], meth_obj, file_content, true)

    return body if body

    @options.warn "No definition for #{meth_name}"
    false
  else # No body, but might still have an override comment
    comment = find_override_comment class_name, meth_obj

    if comment then
      comment.normalize
      find_modifiers comment, meth_obj
      meth_obj.comment = comment

      ''
    else
      @options.warn "No definition for #{meth_name}"
      false
    end
  end
end

#find_class(raw_name, name, base_name = nil) ⇒ Object

Finds a RDoc::NormalClass or RDoc::NormalModule for raw_name



682
683
684
685
686
687
688
689
690
691
692
693
694
695
 
# File 'lib/rdoc/parser/c.rb', line 682

def find_class(raw_name, name, base_name = nil)
  unless @classes[raw_name]
    if raw_name =~ /^rb_m/
      container = @top_level.add_module RDoc::NormalModule, name
    else
      container = @top_level.add_class RDoc::NormalClass, name
    end
    container.name = base_name if base_name

    container.record_location @top_level
    @classes[raw_name] = container
  end
  @classes[raw_name]
end

#find_class_comment(class_name, class_mod) ⇒ Object

Look for class or module documentation above Init_class_name(void), in a Document-class class_name (or module) comment or above an rb_define_class (or module). If a comment is supplied above a matching Init_ and a rb_define_class the Init_ comment is used.

/*
 * This is a comment for Foo
 */
Init_Foo(void) {
    VALUE cFoo = rb_define_class("Foo", rb_cObject);
}

/*
 * Document-class: Foo
 * This is a comment for Foo
 */
Init_foo(void) {
    VALUE cFoo = rb_define_class("Foo", rb_cObject);
}

/*
 * This is a comment for Foo
 */
VALUE cFoo = rb_define_class("Foo", rb_cObject);



723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
 
# File 'lib/rdoc/parser/c.rb', line 723

def find_class_comment class_name, class_mod
  comment = nil

  if @content =~ %r%
      ((?>/\*.*?\*/\s+))
      (static\s+)?
      void\s+
      Init(?:VM)?_(?i:#{class_name})\s*(?:_\(\s*)?\(\s*(?:void\s*)?\)%xm then
    comment = $1.sub(%r%Document-(?:class|module):\s+#{class_name}%, '')
  elsif @content =~ %r%Document-(?:class|module):\s+#{class_name}\s*?
                       (?:<\s+[:,\w]+)?\n((?>.*?\*/))%xm then
    comment = "/*\n#{$1}"
  elsif @content =~ %r%((?>/\*.*?\*/\s+))
                       ([\w\.\s]+\s* = \s+)?rb_define_(class|module)[\t (]*?"(#{class_name})"%xm then
    comment = $1
  elsif @content =~ %r%((?>/\*.*?\*/\s+))
                       ([\w\. \t]+ = \s+)?rb_define_(class|module)_under[\t\w, (]*?"(#{class_name.split('::').last})"%xm then
    comment = $1
  else
    comment = ''
  end

  comment = new_comment comment, @top_level, :c
  comment.normalize

  look_for_directives_in class_mod, comment

  class_mod.add_comment comment, @top_level
end

#find_const_comment(type, const_name, class_name = nil) ⇒ Object

Finds a comment matching type and const_name either above the comment or in the matching Document- section.



779
780
781
782
783
784
785
786
787
788
789
790
791
 
# File 'lib/rdoc/parser/c.rb', line 779

def find_const_comment(type, const_name, class_name = nil)
  @const_table ||= {}
  @const_table[@content] ||= gen_const_table @content
  table = @const_table[@content]

  comment =
    table[[type, const_name]] ||
    (class_name && table[class_name + "::" + const_name]) ||
    table[const_name] ||
    ''

  new_comment comment, @top_level, :c
end

#find_modifiers(comment, meth_obj) ⇒ Object

Handles modifiers in comment and updates meth_obj as appropriate.



796
797
798
799
800
801
 
# File 'lib/rdoc/parser/c.rb', line 796

def find_modifiers comment, meth_obj
  comment.normalize
  comment.extract_call_seq meth_obj

  look_for_directives_in meth_obj, comment
end

#find_override_comment(class_name, meth_obj) ⇒ Object

Finds a Document-method override for meth_obj on class_name



806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
 
# File 'lib/rdoc/parser/c.rb', line 806

def find_override_comment class_name, meth_obj
  name = Regexp.escape meth_obj.name
  prefix = Regexp.escape meth_obj.name_prefix

  comment = if @content =~ %r%Document-method:
                              \s+#{class_name}#{prefix}#{name}
                              \s*?\n((?>.*?\*/))%xm then
              "/*#{$1}"
            elsif @content =~ %r%Document-method:
                                 \s#{name}\s*?\n((?>.*?\*/))%xm then
              "/*#{$1}"
            end

  return unless comment

  new_comment comment, @top_level, :c
end

#gen_body_table(file_content) ⇒ Object

Generate a Ruby-method table



574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
 
# File 'lib/rdoc/parser/c.rb', line 574

def gen_body_table file_content
  table = {}
  file_content.scan(%r{
    ((?>/\*.*?\*/\s*)?)
    ((?:\w+\s+){0,2} VALUE\s+(\w+)
      \s*(?:\([^\)]*\))(?:[^\);]|$))
  | ((?>/\*.*?\*/\s*))^\s*(\#\s*define\s+(\w+)\s+(\w+))
  | ^\s*\#\s*define\s+(\w+)\s+(\w+)
  }xm) do
    case
    when name = $3
      table[name] = [:func_def, $1, $2, $~.offset(2)] if !(t = table[name]) || t[0] != :func_def
    when name = $6
      table[name] = [:macro_def, $4, $5, $~.offset(5), $7] if !(t = table[name]) || t[0] == :macro_alias
    when name = $8
      table[name] ||= [:macro_alias, $9]
    end
  end
  table
end

#gen_const_table(file_content) ⇒ Object

Generate a const table



756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
 
# File 'lib/rdoc/parser/c.rb', line 756

def gen_const_table file_content
  table = {}
  @content.scan(%r{
    ((?>^\s*/\*.*?\*/\s+))
      rb_define_(\w+)\((?:\s*(?:\w+),)?\s*
                         "(\w+)"\s*,
                         .*?\)\s*;
  | Document-(?:const|global|variable):\s
      ((?:\w+::)*\w+)
      \s*?\n((?>.*?\*/))
  }mxi) do
    case
    when $1 then table[[$2, $3]] = $1
    when $4 then table[$4] = "/*\n" + $5
    end
  end
  table
end

#handle_attr(var_name, attr_name, read, write) ⇒ Object

Creates a new RDoc::Attr attr_name on class var_name that is either read, write or both



828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
 
# File 'lib/rdoc/parser/c.rb', line 828

def handle_attr(var_name, attr_name, read, write)
  rw = ''
  rw += 'R' if TRUE_VALUES.include?(read)
  rw += 'W' if TRUE_VALUES.include?(write)

  class_name = @known_classes[var_name]

  return unless class_name

  class_obj = find_class var_name, class_name

  return unless class_obj

  comment = find_attr_comment var_name, attr_name
  comment.normalize

  name = attr_name.gsub(/rb_intern(?:_const)?\("([^"]+)"\)/, '\1')

  attr = RDoc::Attr.new '', name, rw, comment

  attr.record_location @top_level
  class_obj.add_attribute attr
  @stats.add_attribute attr
end

#handle_class_module(var_name, type, class_name, parent, in_module) ⇒ Object

Creates a new RDoc::NormalClass or RDoc::NormalModule based on type named class_name in parent which was assigned to the C var_name.



857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
 
# File 'lib/rdoc/parser/c.rb', line 857

def handle_class_module(var_name, type, class_name, parent, in_module)
  parent_name = @known_classes[parent] || parent

  if in_module then
    enclosure = @classes[in_module] || @store.find_c_enclosure(in_module)

    if enclosure.nil? and enclosure = @known_classes[in_module] then
      enc_type = /^rb_m/ =~ in_module ? :module : :class
      handle_class_module in_module, enc_type, enclosure, nil, nil
      enclosure = @classes[in_module]
    end

    unless enclosure then
      @enclosure_dependencies[in_module] << var_name
      @missing_dependencies[var_name] =
        [var_name, type, class_name, parent, in_module]

      return
    end
  else
    enclosure = @top_level
  end

  if type == :class then
    full_name = if RDoc::ClassModule === enclosure then
                  enclosure.full_name + "::#{class_name}"
                else
                  class_name
                end

    if @content =~ %r%Document-class:\s+#{full_name}\s*<\s+([:,\w]+)% then
      parent_name = $1
    end

    cm = enclosure.add_class RDoc::NormalClass, class_name, parent_name
  else
    cm = enclosure.add_module RDoc::NormalModule, class_name
  end

  cm.record_location enclosure.top_level

  find_class_comment cm.full_name, cm

  case cm
  when RDoc::NormalClass
    @stats.add_class cm
  when RDoc::NormalModule
    @stats.add_module cm
  end

  @classes[var_name] = cm
  @known_classes[var_name] = cm.full_name
  @store.add_c_enclosure var_name, cm
end

#handle_constants(type, var_name, const_name, definition) ⇒ Object

Adds constants. By providing some_value: at the start of the comment you can override the C value of the comment to give a friendly definition.

/* 300: The perfect score in bowling */
rb_define_const(cFoo, "PERFECT", INT2FIX(300));

Will override INT2FIX(300) with the value 300 in the output RDoc. Values may include quotes and escaped colons (:).



922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
 
# File 'lib/rdoc/parser/c.rb', line 922

def handle_constants(type, var_name, const_name, definition)
  class_name = @known_classes[var_name]

  return unless class_name

  class_obj = find_class var_name, class_name, class_name[/::\K[^:]+\z/]

  unless class_obj then
    @options.warn 'Enclosing class or module %p is not known' % [const_name]
    return
  end

  comment = find_const_comment type, const_name, class_name
  comment.normalize

  # In the case of rb_define_const, the definition and comment are in
  # "/* definition: comment */" form.  The literal ':' and '\' characters
  # can be escaped with a backslash.
  if type.downcase == 'const' then
    if /\A(.+?)?:(?!\S)/ =~ comment.text
      new_definition, new_comment = $1, $'

      if !new_definition # Default to literal C definition
        new_definition = definition
      else
        new_definition = new_definition.gsub(/\\([\\:])/, '\1')
      end

      new_definition.sub!(/\A(\s+)/, '')

      new_comment = "#{$1}#{new_comment.lstrip}"

      new_comment = self.new_comment(new_comment, @top_level, :c)

      con = RDoc::Constant.new const_name, new_definition, new_comment
    else
      con = RDoc::Constant.new const_name, definition, comment
    end
  else
    con = RDoc::Constant.new const_name, definition, comment
  end

  con.record_location @top_level
  @stats.add_constant con
  class_obj.add_constant con
end

#handle_ifdefs_in(body) ⇒ Object

Removes #ifdefs that would otherwise confuse us



972
973
974
 
# File 'lib/rdoc/parser/c.rb', line 972

def handle_ifdefs_in(body)
  body.gsub(/^#ifdef HAVE_PROTOTYPES.*?#else.*?\n(.*?)#endif.*?\n/m, '\1')
end

#handle_method(type, var_name, meth_name, function, param_count, source_file = nil) ⇒ Object

Adds an RDoc::AnyMethod meth_name defined on a class or module assigned to var_name. type is the type of method definition function used. singleton_method and module_function create a singleton method.



981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
 
# File 'lib/rdoc/parser/c.rb', line 981

def handle_method(type, var_name, meth_name, function, param_count,
                  source_file = nil)
  class_name = @known_classes[var_name]
  singleton  = @singleton_classes.key? var_name

  @methods[var_name][function] << meth_name

  return unless class_name

  class_obj = find_class var_name, class_name

  if existing_method = class_obj.method_list.find { |m| m.c_function == function }
    add_alias(var_name, class_obj, existing_method.name, meth_name, existing_method.comment)
  end

  if class_obj then
    if meth_name == 'initialize' then
      meth_name = 'new'
      singleton = true
      type = 'method' # force public
    end

    meth_obj = RDoc::AnyMethod.new '', meth_name
    meth_obj.c_function = function
    meth_obj.singleton =
      singleton || %w[singleton_method module_function].include?(type)

    p_count = Integer(param_count) rescue -1

    if source_file then
      file_name = File.join @file_dir, source_file

      if File.exist? file_name then
        file_content = File.read file_name
      else
        @options.warn "unknown source #{source_file} for #{meth_name} in #{@file_name}"
      end
    else
      file_content = @content
    end

    body = find_body class_name, function, meth_obj, file_content

    if body and meth_obj.document_self then
      meth_obj.params = if p_count < -1 then # -2 is Array
                          '(*args)'
                        elsif p_count == -1 then # argc, argv
                          rb_scan_args body
                        else
                          args = (1..p_count).map { |i| "p#{i}" }
                          "(#{args.join ', '})"
                        end


      meth_obj.record_location @top_level

      if meth_obj.section_title
        class_obj.temporary_section = class_obj.add_section(meth_obj.section_title)
      end
      class_obj.add_method meth_obj

      @stats.add_method meth_obj
      meth_obj.visibility = :private if 'private_method' == type
    end
  end
end

#handle_singleton(sclass_var, class_var) ⇒ Object

Registers a singleton class sclass_var as a singleton of class_var



1051
1052
1053
1054
1055
1056
 
# File 'lib/rdoc/parser/c.rb', line 1051

def handle_singleton sclass_var, class_var
  class_name = @known_classes[class_var]

  @known_classes[sclass_var]     = class_name
  @singleton_classes[sclass_var] = class_name
end

#load_variable_map(map_name) ⇒ Object

Loads the variable map with the given name from the RDoc::Store, if present.



1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
 
# File 'lib/rdoc/parser/c.rb', line 1062

def load_variable_map map_name
  return {} unless files = @store.cache[map_name]
  return {} unless name_map = files[@file_name]

  class_map = {}

  name_map.each do |variable, name|
    next unless mod = @store.find_class_or_module(name)

    class_map[variable] = if map_name == :c_class_variables then
                            mod
                          else
                            name
                          end
    @known_classes[variable] = name
  end

  class_map
end

#look_for_directives_in(context, comment) ⇒ Object

Look for directives in a normal comment block:

/*
 * :title: My Awesome Project
 */

This method modifies the comment



1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
 
# File 'lib/rdoc/parser/c.rb', line 1091

def look_for_directives_in context, comment
  @preprocess.handle comment, context do |directive, param|
    case directive
    when 'main' then
      @options.main_page = param
      ''
    when 'title' then
      @options.default_title = param if @options.respond_to? :default_title=
      ''
    end
  end

  comment
end

#new_comment(text = nil, location = nil, language = nil) ⇒ Object

Creates a RDoc::Comment instance.



1221
1222
1223
1224
1225
 
# File 'lib/rdoc/parser/c.rb', line 1221

def new_comment text = nil, location = nil, language = nil
  RDoc::Comment.new(text, location, language).tap do |comment|
    comment.format = @markup
  end
end

#rb_scan_args(method_body) ⇒ Object

Extracts parameters from the method_body and returns a method parameter string. Follows 1.9.3dev’s scan-arg-spec, see README.EXT



1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
 
# File 'lib/rdoc/parser/c.rb', line 1110

def rb_scan_args method_body
  method_body =~ /rb_scan_args\((.*?)\)/m
  return '(*args)' unless $1

  $1.split(/,/)[2] =~ /"(.*?)"/ # format argument
  format = $1.split(//)

  lead = opt = trail = 0

  if format.first =~ /\d/ then
    lead = $&.to_i
    format.shift
    if format.first =~ /\d/ then
      opt = $&.to_i
      format.shift
      if format.first =~ /\d/ then
        trail = $&.to_i
        format.shift
        block_arg = true
      end
    end
  end

  if format.first == '*' and not block_arg then
    var = true
    format.shift
    if format.first =~ /\d/ then
      trail = $&.to_i
      format.shift
    end
  end

  if format.first == ':' then
    hash = true
    format.shift
  end

  if format.first == '&' then
    block = true
    format.shift
  end

  # if the format string is not empty there's a bug in the C code, ignore it

  args = []
  position = 1

  (1...(position + lead)).each do |index|
    args << "p#{index}"
  end

  position += lead

  (position...(position + opt)).each do |index|
    args << "p#{index} = v#{index}"
  end

  position += opt

  if var then
    args << '*args'
    position += 1
  end

  (position...(position + trail)).each do |index|
    args << "p#{index}"
  end

  position += trail

  if hash then
    args << "p#{position} = {}"
  end

  args << '&block' if block

  "(#{args.join ', '})"
end

#remove_commented_out_lines ⇒ Object

Removes lines that are commented out that might otherwise get picked up when scanning for classes and methods



1193
1194
1195
 
# File 'lib/rdoc/parser/c.rb', line 1193

def remove_commented_out_lines
  @content = @content.gsub(%r%//.*rb_define_%, '//')
end

#scan ⇒ Object

Extracts the classes, modules, methods, attributes, constants and aliases from a C file and returns an RDoc::TopLevel for this file



1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
 
# File 'lib/rdoc/parser/c.rb', line 1201

def scan
  remove_commented_out_lines

  do_classes_and_modules
  do_missing

  do_constants
  do_methods
  do_includes
  do_aliases
  do_attrs

  @store.add_c_variables self

  @top_level
end