# class RDoc::Parser::C

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) click to toggle source

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() click to toggle source

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() click to toggle source

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() click to toggle source

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() click to toggle source

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() click to toggle source

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() click to toggle source

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() click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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) click to toggle source

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() click to toggle source

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() click to toggle source

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