class RDoc::Markdown

RDoc::Markdown as described by the markdown syntax.

To choose Markdown 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.

Usage¶ ↑

Here is a brief example of using this parse to read a markdown file by hand.

data = File.read("README.md")
formatter = RDoc::Markup::ToHtml.new(RDoc::Options.new, nil)
html = RDoc::Markdown.parse(data).accept(formatter)

# do something with html

Extensions¶ ↑

The following markdown extensions are supported by the parser, but not all are used in RDoc output by default.

`RDoc`¶ ↑

The RDoc Markdown parser has the following built-in behaviors that cannot be disabled.

Underscores embedded in words are never interpreted as emphasis. (While the markdown dingus emphasizes in-word underscores, neither the Markdown syntax nor MarkdownTest mention this behavior.)

For HTML output, RDoc always auto-links bare URLs.

Break on Newline¶ ↑

The break_on_newline extension converts all newlines into hard line breaks as in Github Flavored Markdown. This extension is disabled by default.

CSS¶ ↑

The css extension enables CSS blocks to be included in the output, but they are not used for any built-in RDoc output format. This extension is disabled by default.

Example:

<style type="text/css">
h1 { font-size: 3em }
</style>

Definition Lists¶ ↑

The definition_lists extension allows definition lists using the PHP Markdown Extra syntax, but only one label and definition are supported at this time. This extension is enabled by default.

Example:

cat
:   A small furry mammal
that seems to sleep a lot

ant
:   A little insect that is known
to enjoy picnics

Produces:

cat: A small furry mammal that seems to sleep a lot
ant: A little insect that is known to enjoy picnics

Strike¶ ↑

Example:

This is ~~striked~~.

Produces:

This is ~striked~.

Github¶ ↑

The github extension enables a partial set of Github Flavored Markdown. This extension is enabled by default.

Supported github extensions include:

Fenced code blocks¶ ↑

Use ``` around a block of code instead of indenting it four spaces.

Syntax highlighting¶ ↑

Use ``` ruby as the start of a code fence to add syntax highlighting. (Currently only ruby syntax is supported).

HTML¶ ↑

Enables raw HTML to be included in the output. This extension is enabled by default.

Example:

<table>
...
</table>

Notes¶ ↑

The notes extension enables footnote support. This extension is enabled by default.

Example:

Here is some text[^1] including an inline footnote ^[for short footnotes]

...

[^1]: With the footnote text down at the bottom

Produces:

Here is some text¹ including an inline footnote ²

Limitations¶ ↑

Link titles are not used
Footnotes are collapsed into a single paragraph

Author¶ ↑

This markdown parser is a port to kpeg from peg-markdown by John MacFarlane.

It is used under the MIT license:

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

The port to kpeg was performed by Eric Hodel and Evan Phoenix

¹ With the footnote text down at the bottom

² for short footnotes

Constants

DEFAULT_EXTENSIONS: Extensions enabled by default
EXTENSIONS: Supported extensions

Public Class Methods

new (extensions = DEFAULT_EXTENSIONS, debug = false)

Creates a new markdown parser that enables the given extensions.

# File lib/rdoc/markdown.rb, line 668
def initialize extensions = DEFAULT_EXTENSIONS, debug = false
  @debug      = debug
  @formatter  = RDoc::Markup::ToJoinedParagraph.new
  @extensions = extensions

  @references          = nil
  @unlinked_references = nil

  @footnotes       = nil
  @note_order      = nil
end

parse (markdown)

Parses the markdown document into an RDoc::Document using the default extensions.

# File lib/rdoc/markdown.rb, line 656
def self.parse markdown
  parser = new

  parser.parse markdown
end

Public Instance Methods

emphasis (text)

Wraps text in emphasis for rdoc inline formatting

# File lib/rdoc/markdown.rb, line 683
def emphasis text
  if text =~ /\A[a-z\d.\/]+\z/i then
    "_#{text}_"
  else
    "<em>#{text}</em>"
  end
end

link_to (content, label = content, text = nil)

Finds a link reference for label and creates a new link to it with content as the link text. If label was not encountered in the reference-gathering parser pass the label and content are reconstructed with the linking text (usually whitespace).

# File lib/rdoc/markdown.rb, line 737
def link_to content, label = content, text = nil
  raise ParseError, 'enable notes extension' if
    content.start_with? '^' and label.equal? content

  if ref = @references[label] then
    "{#{content}}[#{ref}]"
  elsif label.equal? content then
    "[#{content}]#{text}"
  else
    "[#{content}]#{text}[#{label}]"
  end
end

list_item_from (unparsed)

Creates an RDoc::Markup::ListItem by parsing the unparsed content from the first parsing pass.

# File lib/rdoc/markdown.rb, line 754
def list_item_from unparsed
  parsed = inner_parse unparsed.join
  RDoc::Markup::ListItem.new nil, *parsed
end

note (label)

Stores label as a note and fills in previously unknown note references.

# File lib/rdoc/markdown.rb, line 762
def note label
  #foottext = "rdoc-label:foottext-#{label}:footmark-#{label}"

  #ref.replace foottext if ref = @unlinked_notes.delete(label)

  @notes[label] = foottext

  #"{^1}[rdoc-label:footmark-#{label}:foottext-#{label}] "
end

note_for (ref)

Creates a new link for the footnote reference and adds the reference to the note order list for proper display at the end of the document.

# File lib/rdoc/markdown.rb, line 776
def note_for ref
  @note_order << ref

  label = @note_order.length

  "{*#{label}}[rdoc-label:foottext-#{label}:footmark-#{label}]"
end

paragraph (parts)

Creates an RDoc::Markup::Paragraph from parts and including extension-specific behavior

# File lib/rdoc/markdown.rb, line 793
def paragraph parts
  parts = parts.map do |part|
    if "\n" == part then
      RDoc::Markup::HardBreak.new
    else
      part
    end
  end if break_on_newline?

  RDoc::Markup::Paragraph.new(*parts)
end

parse (markdown)

Parses markdown into an RDoc::Document

# File lib/rdoc/markdown.rb, line 808
def parse markdown
  @references          = {}
  @unlinked_references = {}

  markdown += "\n\n"

  setup_parser markdown, @debug
  peg_parse 'References'

  if notes? then
    @footnotes       = {}

    setup_parser markdown, @debug
    peg_parse 'Notes'

    # using note_order on the first pass would be a bug
    @note_order      = []
  end

  setup_parser markdown, @debug
  peg_parse

  doc = result

  if notes? and not @footnotes.empty? then
    doc << RDoc::Markup::Rule.new(1)

    @note_order.each_with_index do |ref, index|
      label = index + 1
      note = @footnotes[ref] or raise ParseError, "footnote [^#{ref}] not found"

      link = "{^#{label}}[rdoc-label:footmark-#{label}:foottext-#{label}] "
      note.parts.unshift link

      doc << note
    end
  end

  doc.accept @formatter

  doc
end

reference (label, link)

Stores label as a reference to link and fills in previously unknown link references.

# File lib/rdoc/markdown.rb, line 855
def reference label, link
  if ref = @unlinked_references.delete(label) then
    ref.replace link
  end

  @references[label] = link
end

strong (text)

Wraps text in strong markup for rdoc inline formatting

# File lib/rdoc/markdown.rb, line 866
def strong text
  if text =~ /\A[a-z\d.\/-]+\z/i then
    "*#{text}*"
  else
    "<b>#{text}</b>"
  end
end

Extensions

Public Class Methods

extension (name)

Creates extension methods for the name extension to enable and disable the extension and to query if they are active.

# File lib/rdoc/markdown.rb, line 603
def self.extension name
  EXTENSIONS << name

  define_method "#{name}?" do
    extension? name
  end

  define_method "#{name}=" do |enable|
    extension name, enable
  end
end

Public Instance Methods

break_on_newline ()

Converts all newlines into hard breaks

# File lib/rdoc/markdown.rb, line 618
extension :break_on_newline

css ()

Allow style blocks

# File lib/rdoc/markdown.rb, line 623
extension :css

definition_lists ()

Allow PHP Markdown Extras style definition lists

# File lib/rdoc/markdown.rb, line 628
extension :definition_lists

extension (name, enable)

Enables or disables the extension with name

# File lib/rdoc/markdown.rb, line 705
def extension name, enable
  if enable then
    @extensions |= [name]
  else
    @extensions -= [name]
  end
end

extension? (name)

Is the extension name enabled?

# File lib/rdoc/markdown.rb, line 696
def extension? name
  @extensions.include? name
end

github ()

Allow Github Flavored Markdown

# File lib/rdoc/markdown.rb, line 633
extension :github

html ()

Allow HTML

# File lib/rdoc/markdown.rb, line 638
extension :html

notes ()

Enables the notes extension

# File lib/rdoc/markdown.rb, line 643
extension :notes

strike ()

Enables the strike extension

# File lib/rdoc/markdown.rb, line 648
extension :strike

class RDoc::Markdown

Usage¶ ↑

Extensions¶ ↑

RDoc¶ ↑

Break on Newline¶ ↑

CSS¶ ↑

Definition Lists¶ ↑

Strike¶ ↑

Github¶ ↑

Fenced code blocks¶ ↑

Syntax highlighting¶ ↑

HTML¶ ↑

Notes¶ ↑

Limitations¶ ↑

Author¶ ↑

Extensions

`RDoc`¶ ↑