========================================= reStructuredText Interpreted Text Roles ========================================= :Author: David Goodger :Contact: docutils-develop@lists.sourceforge.net :Revision: $Revision: 7307 $ :Date: $Date: 2012-01-06 11:11:51 +0000 (Fri, 06 Jan 2012) $ :Copyright: This document has been placed in the public domain. This document describes the interpreted text roles implemented in the reference reStructuredText parser. Interpreted text uses backquotes (`) around the text. An explicit role marker may optionally appear before or after the text, delimited with colons. For example:: This is `interpreted text` using the default role. This is :title:`interpreted text` using an explicit role. A default role may be defined by applications of reStructuredText; it is used if no explicit ``:role:`` prefix or suffix is given. The "default default role" is `:title-reference:`_. It can be changed using the default-role_ directive. See the `Interpreted Text`_ section in the `reStructuredText Markup Specification`_ for syntax details. For details on the hierarchy of elements, please see `The Docutils Document Tree`_ and the `Docutils Generic DTD`_ XML document type definition. For interpreted text role implementation details, see `Creating reStructuredText Interpreted Text Roles`_. .. _"role" directive: directives.html#role .. _default-role: directives.html#default-role .. _Interpreted Text: restructuredtext.html#interpreted-text .. _reStructuredText Markup Specification: restructuredtext.html .. _The Docutils Document Tree: ../doctree.html .. _Docutils Generic DTD: ../docutils.dtd .. _Creating reStructuredText Interpreted Text Roles: ../../howto/rst-roles.html .. contents:: --------------- Customization --------------- Custom interpreted text roles may be defined in a document with the `"role" directive`_. Customization details are listed with each role. .. _class: A ``class`` option is recognized by the "role" directive for most interpreted text roles. A description__ is provided in the `"role" directive`_ documentation. __ directives.html#role-class ---------------- Standard Roles ---------------- ``:emphasis:`` ============== :Aliases: None :DTD Element: emphasis :Customization: :Options: class_. :Content: None. Implements emphasis. These are equivalent:: *text* :emphasis:`text` ``:literal:`` ============== :Aliases: None :DTD Element: literal :Customization: :Options: class_. :Content: None. Implements inline literal text. These are equivalent:: ``text`` :literal:`text` Care must be taken with backslash-escapes though. These are *not* equivalent:: ``text \ and \ backslashes`` :literal:`text \ and \ backslashes` The backslashes in the first line are preserved (and do nothing), whereas the backslashes in the second line escape the following spaces. ``:code:`` ========== :Aliases: None :DTD Element: literal :Customization: :Options: class_, language :Content: None. (New in Docutils 0.9.) The ``code`` role marks its content as code in a formal language. For syntax highlight of inline code, the `"role" directive`_ can be used to build custom roles with the code language specified in the "language" option. For example, the following creates a LaTeX-specific "latex" role:: .. role:: latex(code) :language: latex Content of the new role is parsed and tagged by the Pygments_ syntax highlighter. See the `code directive`_ for more info on parsing and display of code in reStructuredText. In addition to "class_", the following option is recognized: ``language`` : text Name of the code's language. See `supported languages and markup formats`_ for recognized values. .. _code directive: directives.html#code .. _Pygments: http://pygments.org/ .. _supported languages and markup formats: http://pygments.org/languages/ ``:math:`` ========== :Aliases: None :DTD Element: math :Customization: :Options: class_ :Content: None. (New in Docutils 0.8.) The ``math`` role marks its content as mathematical notation (inline formula). The input format is LaTeX math syntax without the “math delimiters“ (``$ $``), for example:: The area of a circle is :math:`A_\text{c} = (\pi/4) d^2`. See the `math directive`_ (producing display formulas) for more info on mathematical notation in reStructuredText. .. _math directive: directives.html#math ``:pep-reference:`` =================== :Aliases: ``:PEP:`` :DTD Element: reference :Customization: :Options: class_. :Content: None. The ``:pep-reference:`` role is used to create an HTTP reference to a PEP (Python Enhancement Proposal). The ``:PEP:`` alias is usually used. For example:: See :PEP:`287` for more information about reStructuredText. This is equivalent to:: See `PEP 287`__ for more information about reStructuredText. __ http://www.python.org/peps/pep-0287.html ``:rfc-reference:`` =================== :Aliases: ``:RFC:`` :DTD Element: reference :Customization: :Options: class_. :Content: None. The ``:rfc-reference:`` role is used to create an HTTP reference to an RFC (Internet Request for Comments). The ``:RFC:`` alias is usually used. For example:: See :RFC:`2822` for information about email headers. This is equivalent to:: See `RFC 2822`__ for information about email headers. __ http://www.faqs.org/rfcs/rfc2822.html ``:strong:`` ============ :Aliases: None :DTD Element: strong :Customization: :Options: class_. :Content: None. Implements strong emphasis. These are equivalent:: **text** :strong:`text` ``:subscript:`` =============== :Aliases: ``:sub:`` :DTD Element: subscript :Customization: :Options: class_. :Content: None. Implements subscripts. .. Tip:: Whitespace or punctuation is required around interpreted text, but often not desired with subscripts & superscripts. Backslash-escaped whitespace can be used; the whitespace will be removed from the processed document:: H\ :sub:`2`\ O E = mc\ :sup:`2` In such cases, readability of the plain text can be greatly improved with substitutions:: The chemical formula for pure water is |H2O|. .. |H2O| replace:: H\ :sub:`2`\ O See `the reStructuredText spec`__ for further information on `character-level markup`__ and `the substitution mechanism`__. __ restructuredtext.html __ restructuredtext.html#character-level-inline-markup __ restructuredtext.html#substitution-references ``:superscript:`` ================= :Aliases: ``:sup:`` :DTD Element: superscript :Customization: :Options: class_. :Content: None. Implements superscripts. See the tip in `:subscript:`_ above. ``:title-reference:`` ===================== :Aliases: ``:title:``, ``:t:``. :DTD Element: title_reference :Customization: :Options: class_. :Content: None. The ``:title-reference:`` role is used to describe the titles of books, periodicals, and other materials. It is the equivalent of the HTML "cite" element, and it is expected that HTML writers will typically render "title_reference" elements using "cite". Since title references are typically rendered with italics, they are often marked up using ``*emphasis*``, which is misleading and vague. The "title_reference" element provides accurate and unambiguous descriptive markup. Let's assume ``:title-reference:`` is the default interpreted text role (see below) for this example:: `Design Patterns` [GoF95]_ is an excellent read. The following document fragment (pseudo-XML_) will result from processing:: Design Patterns GoF95 is an excellent read. ``:title-reference:`` is the default interpreted text role in the standard reStructuredText parser. This means that no explicit role is required. Applications of reStructuredText may designate a different default role, in which case the explicit ``:title-reference:`` role must be used to obtain a ``title_reference`` element. .. _pseudo-XML: ../doctree.html#pseudo-xml ------------------- Specialized Roles ------------------- ``raw`` ======= :Aliases: None :DTD Element: raw :Customization: :Options: class_, format :Content: None .. WARNING:: The "raw" role is a stop-gap measure allowing the author to bypass reStructuredText's markup. It is a "power-user" feature that should not be overused or abused. The use of "raw" ties documents to specific output formats and makes them less portable. If you often need to use "raw"-derived interpreted text roles or the "raw" directive, that is a sign either of overuse/abuse or that functionality may be missing from reStructuredText. Please describe your situation in a message to the Docutils-users_ mailing list. .. _Docutils-users: ../../user/mailing-lists.html#docutils-user The "raw" role indicates non-reStructuredText data that is to be passed untouched to the Writer. It is the inline equivalent of the `"raw" directive`_; see its documentation for details on the semantics. .. _"raw" directive: directives.html#raw-directive The "raw" role cannot be used directly. The `"role" directive`_ must first be used to build custom roles based on the "raw" role. One or more formats (Writer names) must be provided in a "format" option. For example, the following creates an HTML-specific "raw-html" role:: .. role:: raw-html(raw) :format: html This role can now be used directly to pass data untouched to the HTML Writer. For example:: If there just *has* to be a line break here, :raw-html:`
` it can be accomplished with a "raw"-derived role. But the line block syntax should be considered first. .. Tip:: Roles based on "raw" should clearly indicate their origin, so they are not mistaken for reStructuredText markup. Using a "raw-" prefix for role names is recommended. In addition to "class_", the following option is recognized: ``format`` : text One or more space-separated output format names (Writer names).