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;;; prgm.skb  --  Computer programs
;;;
;;; Copyright 2008  Ludovic Court�s <ludo@gnu.org>
;;; Copyright 2001, 2002, 2003, 2004  Manuel Serrano
;;;
;;;
;;; This program is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 2 of the License, or
;;; (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
;;; USA.

;*---------------------------------------------------------------------*/
;*    fib ...                                                          */
;*---------------------------------------------------------------------*/
(define (fib x) ;!fib
   (if (< x 2)
       1
       (+ (fib (- x 1)) (fib (- x 2)))))

;*---------------------------------------------------------------------*/
;*    Computer programs                                                */
;*---------------------------------------------------------------------*/
(chapter :title "Computer Programs" 

(p [In a document describing a computer programming language, it is
common to include excerpt of programs.  Program code is typically
typeset in a specific font, with no justification, and with a precise
,(emph "indentation").  Indentation is important because it helps
understand the code,(begin ";") it is thus desirable to preserve
indentation in program text.  The ,(markup-ref "pre") text layout
already allows indentation to be preserved.  This chapter presents two
new functions that complement it: ,(markup-ref "prog") and ,(markup-ref
"source"), both of which are specially designed to represent computer
programs in text.])

;*---------------------------------------------------------------------*/
;*    Programs ... @label prog@                                        */
;*---------------------------------------------------------------------*/
(section :title "Program"

(p [A ,(code "prog") function call preserves the indentation of the
program. It may automatically introduce line numbers.])

(doc-markup 'prog
	    `((:line ,[Enables/disables automatic line numbering. An integer
               value enables the line number and specifies the number of
               the first line of the program. A value of ,(code "#f") disables
               the line numbering.])
	      (:linedigit ,[The number of digit for representing line
               numbers.])
	      (:mark ,[A string or the boolean ,(code "#f"). If this option 
               is a string, that string is the prefix 
               of line marks. These marks can be used in the 
               ,(markup-ref "ref") reference. A mark
               identifier is defined by the regular expression:
               ,(code [,(char "[")_a-zA-Z,(char "]"),(char "[")_a-zA-Z0-9,(char "]")*]). The prefix and the mark are removed from the output program.]))
	    :force-engines *api-engines*
	    :see-also '(source pre ref))

(example-produce 
 (example :legend "A program" (prgm :file "src/prgm1.skb"))
 (disp (include "src/prgm1.skb"))))

;*---------------------------------------------------------------------*/
;*    Source code ... @label source@                                   */
;*---------------------------------------------------------------------*/
(section :title "Source Code"

(p [The ,(code "source") function extracts part of the source code and
enables ,(emph "fontification"). That is, some words of the program
can be rendered using different colors or faces.])

;!source-start
(doc-markup 'source
	    `((:language ,[The ,(markup-ref "language") of the source code.])
	      (:file ,[The file containing the actual source code. The file
               is searched in the ,(markup-ref "*source-path*") path.])
	      (:start [A start line number or a start marker.])
	      (:stop [A stop line number or a stop marker.])
	      (:definition [The identifier of the definition to extract.])
	      (:tab [The tabulation width.]))
	    :common-args '()
	    :force-engines *api-engines*
	    :see-also '(prog language ref *source-path*))
;!source-stop

(linebreak)
(example-produce 
 (example :legend "The source markup" (prgm :file "src/prgm2.skb"))
 (disp (include "src/prgm2.skb")))

(mark "*source-path*")
(p [Files passed as the ,(tt [:file]) argument of ,(markup-ref "source")
are searched in the current ,(emph [source path]), which is defined by the
,(tt [*source-path*]) ,(srfi-ref 39) parameter.  This parameter contains
a list of directories and its value can be obtained using ,(code
[(*source-path*)]).  Its value can be altered using the ,(tt [-S])
command-line option of the ,(tt [skribilo]) compiler (see ,(numref :text
[Chapter] :ident "compiler") for details).])
   
(p [The ,(param :language) parameter of ,(markup-ref "source") takes a
,(tt [language]) object, which performs the actual source highlighting.
Several programming languages are currently supported: the ,(tt
[(skribilo source lisp)]) module provides ,(tt [skribe]), ,(tt [scheme]),
,(tt [stklos]), ,(tt [bigloo]) and ,(tt [lisp]), which implement source
highlighting for the corresponding lispy dialects, while the ,(tt
[(skribilo source c)]) module provides ,(tt [c]) and ,(tt [java]).
Thus, you need to import the relevant module to get the right language,
for instance by adding ,(code [(use-modules (skribilo source c))]) at
the beginning of your document.  Additional languages can be created
using the ,(markup-ref "language") function (see below).]))

;*---------------------------------------------------------------------*/
;*    Language ... @label language@                                    */
;*---------------------------------------------------------------------*/
(section :title "Language"
(index "source" :note "fontification")
(index "fontification")

(p [The ,(code "language") function builds a language that can be used
in ,(markup-ref "source") function call.])

(doc-markup 'language
	    `((:name [A string which denotes the name of the language.])
	      (:fontifier [A function of one argument (a string), that
               colorizes a line source code.])
	      (:extractor [A function of three arguments: an input port,
               an identifier, a tabulation size. This function ,(emph "scans")
               in the input port the definition is looks for.]))
	    :common-args '()
	    :force-engines *api-engines*
	    :see-also '(prog source ref))

; **** FIXME:
(cond-expand
   (bigloo
    (example-produce 
     (example :legend "An ad-hoc fontification"
	      (prgm :file "src/prgm3.skb"))
     (disp (include "src/prgm3.skb"))))
   (else
    '()))))

;;; Local Variables:
;;; coding: latin-1
;;; ispell-local-dictionary: "american"
;;; End: