# class RDoc::TomDoc

A parser for `TomDoc` based on `TomDoc` 1.0.0-rc1 (02adef9b5a)

The `TomDoc` specification can be found at tomdoc.org.

To choose `TomDoc` as your only default format see Saved Options at `RDoc::Options` for instructions on setting up a `.rdoc_options` file to store your project default.

There are a few differences between this parser and the specification. A best-effort was made to follow the specification as closely as possible but some choices to deviate were made.

A future version of `RDoc` will warn when a MUST or MUST NOT is violated and may warn when a SHOULD or SHOULD NOT is violated. `RDoc` will always try to emit documentation even if given invalid `TomDoc`.

Here are some implementation choices this parser currently makes:

This parser allows rdoc-style inline markup but you should not depended on it.

This parser allows a space between the comment and the method body.

This parser does not require the default value to be described for an optional argument.

This parser does not examine the order of sections. An Examples section may precede the Arguments section.

This class is documented in `TomDoc` format. Since this is a subclass of the `RDoc` markup parser there isn’t much to see here, unfortunately.

## Public

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### Public Class Methods

new ()
Source

    # File lib/rdoc/tom_doc.rb, line 124
    def initialize
      super

      @section      = nil
      @seen_returns = false
    end

Creates a new `TomDoc` parser. See also `RDoc::Markup::parse`

Calls superclass method
parse (text)
Source

    # File lib/rdoc/tom_doc.rb, line 78
    def self.parse text
      parser = new

      parser.tokenize text
      doc = RDoc::Markup::Document.new
      parser.parse doc
      doc
    end

Parses `TomDoc` from text

text

  A `String` containing TomDoc-format text.

### Examples¶ ↑

    RDoc::TomDoc.parse <<-TOMDOC
    This method does some things

    Returns nothing.
    TOMDOC
    # => #<RDoc::Markup::Document:0xXXX @parts=[...], @file=nil>

### Returns¶ ↑

Returns an RDoc::Markup::Document representing the `TomDoc` format.

## Internal

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### Attributes

tokens [R]

Token accessor

### Public Class Methods

signature (comment)
Source

    # File lib/rdoc/tom_doc.rb, line 94
    def self.signature comment
      return unless comment.tomdoc?

      document = comment.parse

      signature = nil
      found_heading = false
      found_signature = false

      document.parts.delete_if do |part|
        next false if found_signature

        found_heading ||=
          RDoc::Markup::Heading === part && part.text == 'Signature'

        next false unless found_heading

        next true if RDoc::Markup::BlankLine === part

        if RDoc::Markup::Verbatim === part then
          signature = part
          found_signature = true
        end
      end

      signature and signature.text
    end

Extracts the Signature section’s method signature

comment

  An `RDoc::Comment` that will be parsed and have the signature extracted

### Returns¶ ↑

Returns a `String` containing the signature and nil if not

### Public Instance Methods

build_heading (level)
Source

    # File lib/rdoc/tom_doc.rb, line 137
    def build_heading level
      heading = super

      @section = heading.text

      heading
    end

Builds a heading from the token stream

level

  The level of heading to create

### Returns¶ ↑

Returns an RDoc::Markup::Heading

Calls superclass method
build_paragraph (margin)
Source

    # File lib/rdoc/tom_doc.rb, line 167
    def build_paragraph margin
      p :paragraph_start => margin if @debug

      paragraph = RDoc::Markup::Paragraph.new

      until @tokens.empty? do
        type, data, = get

        case type
        when :TEXT then
          @section = 'Returns' if data =~ /\A(Returns|Raises)/

          paragraph << data
        when :NEWLINE then
          if :TEXT == peek_token[0] then
            # Lines beginning with 'Raises' in the Returns section should not be
            # treated as multiline text
            if 'Returns' == @section and
              peek_token[1].start_with?('Raises') then
              break
            else
              paragraph << ' '
            end
          else
            break
          end
        else
          unget
          break
        end
      end

      p :paragraph_end => margin if @debug

      paragraph
    end

Builds a paragraph from the token stream

margin

  Unused

### Returns¶ ↑

Returns an RDoc::Markup::Paragraph.

build_verbatim (margin)
Source

    # File lib/rdoc/tom_doc.rb, line 153
    def build_verbatim margin
      verbatim = super

      verbatim.format = :ruby if @section == 'Examples'

      verbatim
    end

Builds a verbatim from the token stream. A verbatim in the Examples section will be marked as in Ruby format.

margin

  The indentation from the margin for lines that belong to this verbatim section.

### Returns¶ ↑

Returns an RDoc::Markup::Verbatim

Calls superclass method
tokenize (text)
Source

    # File lib/rdoc/tom_doc.rb, line 225
    def tokenize text
      text = text.sub(/\A(Public|Internal|Deprecated):\s+/, '')

      setup_scanner text

      until @s.eos? do
        pos = @s.pos

        # leading spaces will be reflected by the column of the next token
        # the only thing we loose are trailing spaces at the end of the file
        next if @s.scan(/ +/)

        @tokens << case
                   when @s.scan(/\r?\n/) then
                     token = [:NEWLINE, @s.matched, *pos]
                     @s.newline!
                     token
                   when @s.scan(/(Examples|Signature)$/) then
                     @tokens << [:HEADER, 3, *pos]

                     [:TEXT, @s[1], *pos]
                   when @s.scan(/([:\w][\w\[\]]*)[ ]+- /) then
                     [:NOTE, @s[1], *pos]
                   else
                     @s.scan(/.*/)
                     [:TEXT, @s.matched.sub(/\r$/, ''), *pos]
                   end
      end

      self
    end

Turns text into an `Array` of tokens

text

  A `String` containing TomDoc-format text.

### Returns¶ ↑

Returns self.