docidx_lang_syntax(n) Documentation tools docidx_lang_syntax(n) 







docidx_lang_syntax - docidx language syntax








This document contains the formal specification of the syntax of
    the docidx markup language, version 1 in Backus-Naur-Form. This document is
    intended to be a reference, complementing the docidx language command
    reference. A beginner should read the much more informally written
    docidx language introduction first before trying to understand either
    this document or the command reference.








In the broadest terms possible the docidx markup language
    is like SGML and similar languages. A document written in this language
    consists primarily of markup commands, with text embedded into it at some
    places.


Each markup command is a just Tcl command surrounded by a matching
    pair of [ and ]. Which commands are available, and their
    arguments, i.e. syntax is specified in the docidx language command
    reference.


In this document we specify first the lexeme, and then the syntax,
    i.e. how we can mix text and markup commands with each other.








In the syntax rules listed in the next section



  
[1]

  
<TEXT> stands for all text except markup commands.

  
[2]

  
Any XXX stands for the markup command [xxx] including its arguments. Each
      markup command is a Tcl command surrounded by a matching pair of [
      and ]. Inside of these delimiters the usual rules for a Tcl command
      apply with regard to word quotation, nested commands, continuation lines,
      etc.

  
[3]

  
<WHITE> stands for all text consisting only of spaces, newlines,
      tabulators and the comment markup command.










The rules listed here specify only the syntax of docidx documents.
    The lexical level of the language was covered in the previous section.


Regarding the syntax of the (E)BNF itself



  
[1]

  
The construct { X } stands for zero or more occurrences of X.

  
[2]

  
The construct [ X ] stands for zero or one occurrence of X.




The syntax:


index     = defs


            INDEX_BEGIN


            [ contents ]


            INDEX_END


            { <WHITE> }
defs      = { INCLUDE | VSET | <WHITE> }
contents  = keyword { keyword }
keyword   = defs KEY ref { ref }
ref       = MANPAGE | URL | defs


At last a rule we were unable to capture in the EBNF syntax, as it is about the
  arguments of the markup commands, something which is not modeled here.


  
[1]

  
The arguments of all markup commands have to be plain text, and/or text
      markup commands, i.e. one of







  
[1]

  
lb,

  
[2]

  
rb, or

  
[3]

  
vset (1-argument form).












This document, will undoubtedly contain bugs and other problems.
    Please report such in the category doctools of the Tcllib SF
    Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also
    report any ideas for enhancements you may have.








docidx_intro, docidx_lang_cmdref, docidx_lang_faq,
    docidx_lang_intro








docidx commands, docidx language, docidx markup, docidx syntax,
    markup, semantic markup








Documentation tools








Copyright (c) 2007-2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>








  

    1.0
    doctools