RDoc::Parser::

C

class

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(ary)
    VALUE ary;
{
    ary = rb_obj_dup(ary);
    rb_ary_flatten_bang(ary);
    return ary;
}

...

void
Init_Array()
{
  ...
  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.

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: <tt>ClassName::method_name<tt>

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

Document-method: <tt>ClassName#method_name<tt>

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. ...

%r*

   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.
  /

Attributes

content[RW]

C file the parser is parsing

known_classes[R]

Maps C variable names to names of ruby classes (andsingleton classes)

singleton_classes[R]

Maps C variable names to names of ruby singleton classes

Public Class Methods

new(top_level, file_name, content, options, stats)

Prepare to parse a C file

# File lib/rdoc/parser/c.rb, line 146
def initialize(top_level, file_name, content, options, stats)
  super

  @known_classes = RDoc::KNOWN_CLASSES.dup
  @content = handle_tab_width handle_ifdefs_in(@content)
  @classes = {}
  @singleton_classes = {}
  @file_dir = File.dirname(@file_name)
end
reset()

Resets cross-file state. Call when parsing different projects that need separate documentation.

# File lib/rdoc/parser/c.rb, line 136
def self.reset
  @@enclosure_classes = {}
  @@known_bodies = {}
end

Public Instance Methods

do_aliases()

Scans content for rb_define_alias

# File lib/rdoc/parser/c.rb, line 159
def do_aliases
  @content.scan(%rrb_define_alias\s*\(
                 \s*(\w+),
                 \s*"(.+?)",
                 \s*"(.+?)"
                 \s*\)/m) do |var_name, new_name, old_name|
    class_name = @known_classes[var_name]

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

    class_obj = find_class var_name, class_name

    al = RDoc::Alias.new '', old_name, new_name, ''
    al.singleton = @singleton_classes.key? var_name

    comment = find_alias_comment var_name, new_name, old_name

    comment.normalize

    al.comment = comment

    al.record_location @top_level

    class_obj.add_alias al
    @stats.add_alias al
  end
end
do_attrs()

Scans content for rb_attr and rb_define_attr

# File lib/rdoc/parser/c.rb, line 194
def do_attrs
  @content.scan(%rrb_attr\s*\(
                 \s*(\w+),
                 \s*([\w"()]+),
                 \s*([01]),
                 \s*([01]),
                 \s*\w+\);/m) do |var_name, attr_name, read, write|
    handle_attr var_name, attr_name, read, write
  end

  @content.scan(%rrb_define_attr\(
                           \s*([\w\.]+),
                           \s*"([^"]+)",
                           \s*(\d+),
                           \s*(\d+)\s*\);
              %m) do |var_name, attr_name, read, write|
    handle_attr var_name, attr_name, read, write
  end
end
do_classes()

Scans content for rb_define_module, rb_define_class, boot_defclass, rb_define_module_under, rb_define_class_under and rb_singleton_class

# File lib/rdoc/parser/c.rb, line 218
def do_classes
  @content.scan(%r(\w+)\s* = \s*rb_define_module\s*\(\s*"(\w+)"\s*\)/x) do
    |var_name, class_name|
    handle_class_module(var_name, "module", class_name, nil, nil)
  end

  # The '.' lets us handle SWIG-generated files
  @content.scan(%r([\w\.]+)\s* = \s*rb_define_class\s*
            \(
               \s*"(\w+)",
               \s*(\w+)\s*
            \)/x) do |var_name, class_name, parent|
    handle_class_module(var_name, "class", class_name, parent, nil)
  end

  @content.scan(%r([\w\.]+)\s* = \s*rb_struct_define_without_accessor\s*
            \(
               \s*"(\w+)",  # Class name
               \s*(\w+),    # Parent class
               \s*\w+,      # Allocation function
               (\s*"\w+",)* # Attributes
               \s*NULL
            \)/x) do |var_name, class_name, parent|
    handle_class_module(var_name, "class", class_name, parent, nil)
  end

  @content.scan(%r(\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

  @content.scan(%r(\w+)\s* = \s*rb_define_module_under\s*
            \(
               \s*(\w+),
               \s*"(\w+)"
            \s*\)/x) do |var_name, in_module, class_name|
    handle_class_module(var_name, "module", class_name, nil, in_module)
  end

  @content.scan(%r([\w\.]+)\s* =                  # var_name
                 \s*rb_define_class_under\s*
                 \(
                   \s* (\w+),                    # under
                   \s* "(\w+)",                  # class_name
                   \s*
                   (?:
                     ([\w\*\s\(\)\.\->]+) |      # parent_name
                     rb_path2class\("([\w:]+)"\) # path
                   )
                   \s*
                 \)
                /x) do |var_name, under, class_name, parent_name, path|
    parent = path || parent_name

    handle_class_module var_name, 'class', class_name, parent, under
  end

  @content.scan(%r([\w\.]+)\s* = \s*rb_singleton_class\s*
                \(
                  \s*(\w+)
                \s*\)/x) do |sclass_var, class_var|
    handle_singleton sclass_var, class_var
  end
end
do_constants()

Scans content for rb_define_variable, rb_define_readonly_variable, rb_define_const and rb_define_global_const

# File lib/rdoc/parser/c.rb, line 288
def do_constants
  @content.scan(%r\Wrb_define_
                 ( variable          |
                   readonly_variable |
                   const             |
                   global_const        )
             \s*\(
               (?:\s*(\w+),)?
               \s*"(\w+)",
               \s*(.*?)\s*\)\s*;
               %m) 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*;%m) do |consts|
    const = consts.first
    handle_constants 'const', 'mCurses', const, "UINT2NUM(#{const})"
  end
end
do_includes()

Scans content for rb_include_module

# File lib/rdoc/parser/c.rb, line 319
def do_includes
  @content.scan(%rrb_include_module\s*\(\s*(\w+?),\s*(\w+?)\s*\)/) do |c,m|
    if cls = @classes[c]
      m = @known_classes[m] || m

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

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

# File lib/rdoc/parser/c.rb, line 336
def do_methods
  @content.scan(%rrb_define_
                 (
                    singleton_method |
                    method           |
                    module_function  |
                    private_method
                 )
                 \s*\(\s*([\w\.]+),
                   \s*"([^"]+)",
                   \s*(?:RUBY_METHOD_FUNC\(|VALUEFUNC\()?(\w+)\)?,
                   \s*(-?\w+)\s*\)
                 (?:;\s*/[*/]\s+in\s+(\w+?\.(?:cpp|c|y)))?
               %m) 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(%rrb_define_global_function\s*\(
                           \s*"([^"]+)",
                           \s*(?:RUBY_METHOD_FUNC\(|VALUEFUNC\()?(\w+)\)?,
                           \s*(-?\w+)\s*\)
              (?:;\s*/[*/]\s+in\s+(\w+?\.[cy]))?
              %m) do |meth_name, function, param_count, source_file|
    handle_method("method", "rb_mKernel", meth_name, function, param_count,
                  source_file)
  end

  @content.scan(%rdefine_filetest_function\s*\(
                   \s*"([^"]+)",
                   \s*(?:RUBY_METHOD_FUNC\(|VALUEFUNC\()?(\w+)\)?,
                   \s*(-?\w+)\s*\)/m) 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
find_alias_comment(class_name, new_name, old_name)

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

# File lib/rdoc/parser/c.rb, line 385
def find_alias_comment class_name, new_name, old_name
  content =~ %r((?>/\*.*?\*/\s+))
                rb_define_alias\(\s*#{Regexp.escape class_name}\s*,
                                 \s*"#{Regexp.escape new_name}"\s*,
                                 \s*"#{Regexp.escape old_name}"\s*\);%m

  RDoc::Comment.new($1 || '', @top_level)
end
find_attr_comment(var_name, attr_name, read = nil, write = nil)

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.

# File lib/rdoc/parser/c.rb, line 403
def find_attr_comment var_name, attr_name, read = nil, write = nil
  attr_name = Regexp.escape attr_name

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

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

  RDoc::Comment.new comment, @top_level
end
find_body(class_name, meth_name, meth_obj, file_content, quiet = false)

Find the C code corresponding to a Ruby method

# File lib/rdoc/parser/c.rb, line 435
def find_body class_name, meth_name, meth_obj, file_content, quiet = false
  case file_content
  when %r((?>/\*.*?\*/\s*)?)
          ((?:(?:static|SWIGINTERN)\s+)?
           (?:intern\s+)?VALUE\s+#{meth_name}
           \s*(\([^)]*\))([^;]|$))%m then
    comment = RDoc::Comment.new $1, @top_level
    body = $2
    offset = $~.offset(2).first

    comment.remove_private if comment

    # try to find the whole body
    body = $& if %r#{Regexp.escape body}[^(]*?\{.*?^\}/ =~ 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 = RDoc::RubyToken::Token.new nil, 1, 1
    tk.set_text body
    meth_obj.add_token tk
    meth_obj.comment = comment
    meth_obj.offset  = offset
    meth_obj.line    = file_content[0, offset].count("\n") + 1

    body
  when %r((?>/\*.*?\*/\s*))^\s*(\#\s*define\s+#{meth_name}\s+(\w+))% then
    comment = RDoc::Comment.new $1, @top_level
    body = $2
    offset = $~.offset(2).first

    find_body class_name, $3, meth_obj, file_content, true

    comment.normalize
    find_modifiers comment, meth_obj

    meth_obj.start_collecting_tokens
    tk = RDoc::RubyToken::Token.new nil, 1, 1
    tk.set_text body
    meth_obj.add_token tk
    meth_obj.comment = comment
    meth_obj.offset  = offset
    meth_obj.line    = file_content[0, offset].count("\n") + 1

    body
  when %r^\s*\#\s*define\s+#{meth_name}\s+(\w+)% then
    # with no comment we hope the aliased definition has it and use it's
    # definition

    body = find_body(class_name, $1, 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)

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

# File lib/rdoc/parser/c.rb, line 520
def find_class(raw_name, name)
  unless @classes[raw_name]
    if raw_name =~ %r^rb_m/
      container = @top_level.add_module RDoc::NormalModule, name
    else
      container = @top_level.add_class RDoc::NormalClass, name
    end

    container.record_location @top_level
    @classes[raw_name] = container
  end
  @classes[raw_name]
end
find_class_comment(class_name, class_mod)

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);
}

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

# File lib/rdoc/parser/c.rb, line 560
def find_class_comment(class_name, class_mod)
  comment = nil

  if @content =~ %r
      ((?>/\*.*?\*/\s+))
      (static\s+)?
      void\s+
      Init_#{class_name}\s*(?:_\(\s*)?\(\s*(?:void\s*)?\)%mi then
    comment = $1.sub(%rDocument-(?:class|module):\s+#{class_name}%, '')
  elsif @content =~ %rDocument-(?:class|module):\s+#{class_name}\s*?
                       (?:<\s+[:,\w]+)?\n((?>.*?\*/))%m then
    comment = "/*\n#{$1}"
  elsif @content =~ %r((?>/\*.*?\*/\s+))
                       ([\w\.\s]+\s* = \s+)?rb_define_(class|module).*?"(#{class_name})"%m then
    comment = $1
  elsif @content =~ %r((?>/\*.*?\*/\s+))
                       ([\w\.\s]+\s* = \s+)?rb_define_(class|module)_under.*?"(#{class_name.split('::').last})"%m then
    comment = $1
  else
    comment = ''
  end

  comment = RDoc::Comment.new comment, @top_level
  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)

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

# File lib/rdoc/parser/c.rb, line 594
def find_const_comment(type, const_name, class_name = nil)
  comment = if @content =~ %r((?>^\s*/\*.*?\*/\s+))
                           rb_define_#{type}\((?:\s*(\w+),)?\s*
                                              "#{const_name}"\s*,
                                              .*?\)\s*;%mi then
              $1
            elsif class_name and
                  @content =~ %rDocument-(?:const|global|variable):\s
                                 #{class_name}::#{const_name}
                                 \s*?\n((?>.*?\*/))%m then
              "/*\n#{$1}"
            elsif @content =~ %rDocument-(?:const|global|variable):
                                 \s#{const_name}
                                 \s*?\n((?>.*?\*/))%m then
              "/*\n#{$1}"
            else
              ''
            end

  RDoc::Comment.new comment, @top_level
end
find_modifiers(comment, meth_obj)

Handles modifiers in comment and updates meth_obj as appropriate.

# File lib/rdoc/parser/c.rb, line 619
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)

Finds a Document-method override for meth_obj on class_name

# File lib/rdoc/parser/c.rb, line 629
def find_override_comment class_name, meth_obj
  name = Regexp.escape meth_obj.name
  prefix = Regexp.escape meth_obj.name_prefix

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

  return unless comment

  RDoc::Comment.new comment, @top_level
end
handle_attr(var_name, attr_name, read, write)

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

# File lib/rdoc/parser/c.rb, line 651
def handle_attr(var_name, attr_name, read, write)
  rw = ''
  rw << 'R' if '1' == read
  rw << 'W' if '1' == 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(%rrb_intern\("([^"]+)"\)/, '\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)

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

# File lib/rdoc/parser/c.rb, line 680
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] || @@enclosure_classes[in_module]

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

    unless enclosure then
      @options.warn "Enclosing class/module '#{in_module}' for "                        "#{type} #{class_name} not known"
      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 =~ %rDocument-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
  @@enclosure_classes[var_name] = cm
  @known_classes[var_name] = cm.full_name
end
handle_constants(type, var_name, const_name, definition)

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 (:).

# File lib/rdoc/parser/c.rb, line 743
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

  unless class_obj then
    @options.warn "Enclosing class/module #{const_name.inspect} not known"
    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
    elements = comment.text.split ':'

    if elements.nil? or elements.empty? then
      con = RDoc::Constant.new const_name, definition, comment
    else
      new_definition = elements[0..-2].join(':')

      if new_definition.empty? then # Default to literal C definition
        new_definition = definition
      else
        new_definition.gsub!("\:", ":")
        new_definition.gsub!("\\", '\')
      end

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

      new_comment = if $1.nil? then
                      elements.last.lstrip
                    else
                      "#{$1}#{elements.last.lstrip}"
                    end

      new_comment = RDoc::Comment.new new_comment, @top_level

      con = RDoc::Constant.new const_name, new_definition, new_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)

Removes ifdefs that would otherwise confuse us

# File lib/rdoc/parser/c.rb, line 800
def handle_ifdefs_in(body)
  body.gsub(%r^#ifdef HAVE_PROTOTYPES.*?#else.*?\n(.*?)#endif.*?\n/, '\1')
end
handle_method(type, var_name, meth_name, function, param_count, source_file = nil)

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.

# File lib/rdoc/parser/c.rb, line 809
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

  return unless class_name

  class_obj = find_class var_name, class_name

  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 = (@@known_bodies[file_name] ||= 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
                          "(#{(1..p_count).map { |i| "p#{i}" }.join ', '})"
                        end


      meth_obj.record_location @top_level
      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)

Registers a singleton class sclass_var as a singleton of class_var

# File lib/rdoc/parser/c.rb, line 868
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
handle_tab_width(body)

Normalizes tabs in body

# File lib/rdoc/parser/c.rb, line 878
def handle_tab_width(body)
  if %r\t/ =~ body
    tab_width = @options.tab_width
    body.split(%r\n/).map do |line|
      1 while line.gsub!(%r\t+/) do
        ' ' * (tab_width * $&.length - $`.length % tab_width)
      end && $~
      line
    end.join "\n"
  else
    body
  end
end
look_for_directives_in(context, comment)

Look for directives in a normal comment block:

* :title: My Awesome Project

This method modifies the comment

# File lib/rdoc/parser/c.rb, line 901
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
rb_scan_args(method_body)

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

# File lib/rdoc/parser/c.rb, line 920
def rb_scan_args method_body
  method_body =~ %rrb_scan_args\((.*?)\)/
  return '(*args)' unless $1

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

  lead = opt = trail = 0

  if format.first =~ %r\d/ then
    lead = $&.to_i
    format.shift
    if format.first =~ %r\d/ then
      opt = $&.to_i
      format.shift
      if format.first =~ %r\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 =~ %r\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} = {}"
    position += 1
  end

  args << '&block' if block

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

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

# File lib/rdoc/parser/c.rb, line 1004
def remove_commented_out_lines
  @content.gsub!(%r//.*rb_define_%, '//')
end
scan()

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

# File lib/rdoc/parser/c.rb, line 1012
def scan
  remove_commented_out_lines
  do_classes
  do_constants
  do_methods
  do_includes
  do_aliases
  do_attrs
  @top_level
end