/usr/share/sgml/docbook/stylesheet/dsssl/modular/print/dbverb.dsl is in docbook-dsssl 1.79-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;
;; This file is part of the Modular DocBook Stylesheet distribution.
;; See ../README or http://docbook.sourceforge.net/projects/dsssl/
;;
(define verbatim-style
(style
font-family-name: %mono-font-family%
font-size: (* (inherited-font-size)
(if %verbatim-size-factor%
%verbatim-size-factor%
1.0))
font-weight: 'medium
font-posture: 'upright
line-spacing: (* (* (inherited-font-size)
(if %verbatim-size-factor%
%verbatim-size-factor%
1.0))
%line-spacing-factor%)
first-line-start-indent: 0pt
lines: 'asis
input-whitespace-treatment: 'preserve))
(define inline-verbatim-style
(style
font-family-name: %mono-font-family%
font-size: (* (inherited-font-size)
(if %verbatim-size-factor%
%verbatim-size-factor%
1.0))
font-weight: 'medium
font-posture: 'upright
lines: 'asis
input-whitespace-treatment: 'preserve))
(define linespecific-style
(style
first-line-start-indent: 0pt
lines: 'asis
input-whitespace-treatment: 'preserve))
(define ($format-indent$ indent)
(literal indent))
(define ($format-linenumber$ linenumber)
;; A line-field would make more sense here, and allow proportional
;; fonts, but you can't put line-fields in the middle of a paragraph
;; in the current RTF backend of Jade
(let ((%factor% (if %verbatim-size-factor%
%verbatim-size-factor%
1.0)))
(if (equal? (remainder linenumber %linenumber-mod%) 0)
(make sequence
use: verbatim-style
(literal (pad-string (format-number linenumber "1")
%linenumber-length% %linenumber-padchar%))
($linenumber-space$))
(make sequence
use: verbatim-style
(literal (pad-string "" %linenumber-length% " "))
($linenumber-space$)))))
(define ($line-start$ indent line-numbers? #!optional (line-number 1))
(make sequence
(if indent
($format-indent$ indent)
(empty-sosofo))
(if line-numbers?
($format-linenumber$ line-number)
(empty-sosofo))))
(define ($linespecific-display$ indent line-numbers?)
(let ((vspace (if (INBLOCK?)
0pt
(if (INLIST?)
%para-sep%
%block-sep%))))
(make paragraph
use: linespecific-style
space-before: (if (and (string=? (gi (parent)) (normalize "entry"))
(absolute-first-sibling?))
0pt
vspace)
space-after: (if (and (string=? (gi (parent)) (normalize "entry"))
(absolute-last-sibling?))
0pt
vspace)
start-indent: (if (INBLOCK?)
(inherited-start-indent)
(+ %block-start-indent% (inherited-start-indent)))
(if (or indent line-numbers?)
($linespecific-line-by-line$ indent line-numbers?)
(process-children)))))
(define ($linespecific-line-by-line$ indent line-numbers?)
(let ((expanded-content
;; this is the content with
;; inlinemediaobject/imageobject[@format='linespecific']
;; expanded
(let loop ((kl (children (current-node))) (rl (empty-node-list)))
(if (node-list-empty? kl)
rl
(if (equal? (gi (node-list-first kl))
(normalize "inlinemediaobject"))
(let* ((imgobj (node-list-filter-by-gi
(children (node-list-first kl))
(list (normalize "imageobject"))))
(datobj (node-list-filter-by-gi
(children imgobj)
(list (normalize "imagedata")))))
(if (and (not (node-list-empty? imgobj))
(not (node-list-empty? datobj))
(equal? (attribute-string (normalize "format") datobj)
(normalize "linespecific")))
(loop (node-list-rest kl)
(node-list rl (string->nodes (include-characters
(if (attribute-string (normalize "fileref") datobj)
(attribute-string (normalize "fileref") datobj)
(entity-generated-system-id (attribute-string (normalize "entityref") datobj)))))))
(loop (node-list-rest kl)
(node-list rl (node-list-first kl)))))
(loop (node-list-rest kl) (node-list rl (node-list-first kl))))))))
(make sequence
($line-start$ indent line-numbers? 1)
(let loop ((kl expanded-content)
(linecount 1)
(res (empty-sosofo)))
(if (node-list-empty? kl)
res
(loop
(node-list-rest kl)
(if (char=? (node-property 'char (node-list-first kl)
default: #\U-0000) #\U-000D)
(+ linecount 1)
linecount)
(let ((c (node-list-first kl)))
(if (char=? (node-property 'char c default: #\U-0000)
#\U-000D)
(sosofo-append res
(process-node-list c)
($line-start$ indent line-numbers?
(+ linecount 1)))
(sosofo-append res (process-node-list c))))))))))
(define ($verbatim-display$ indent line-numbers?)
(let* ((width-in-chars (if (attribute-string (normalize "width"))
(string->number (attribute-string (normalize "width")))
%verbatim-default-width%))
(fsize (lambda () (if (or (attribute-string (normalize "width"))
(not %verbatim-size-factor%))
(/ (/ (- %text-width% (inherited-start-indent))
width-in-chars)
0.7)
(* (inherited-font-size)
%verbatim-size-factor%))))
(vspace-before (if (INBLOCK?)
0pt
(if (INLIST?)
%para-sep%
%block-sep%)))
(vspace-after (if (INBLOCK?)
0pt
(if (INLIST?)
0pt
%block-sep%))))
(make paragraph
use: verbatim-style
space-before: (if (and (string=? (gi (parent)) (normalize "entry"))
(absolute-first-sibling?))
0pt
vspace-before)
space-after: (if (and (string=? (gi (parent)) (normalize "entry"))
(absolute-last-sibling?))
0pt
vspace-after)
font-size: (fsize)
line-spacing: (* (fsize) %line-spacing-factor%)
start-indent: (if (INBLOCK?)
(inherited-start-indent)
(+ %block-start-indent% (inherited-start-indent)))
(if (or indent line-numbers?)
($linespecific-line-by-line$ indent line-numbers?)
(process-children)))))
(element literallayout
(if (equal? (attribute-string "class") (normalize "monospaced"))
($verbatim-display$
%indent-literallayout-lines%
(or %number-literallayout-lines%
(equal? (attribute-string (normalize "linenumbering"))
(normalize "numbered"))))
($linespecific-display$
%indent-literallayout-lines%
(or %number-literallayout-lines%
(equal? (attribute-string (normalize "linenumbering"))
(normalize "numbered"))))))
(element address
($linespecific-display$
%indent-address-lines%
(or %number-address-lines%
(equal? (attribute-string (normalize "linenumbering"))
(normalize "numbered")))))
(element programlisting
($verbatim-display$
%indent-programlisting-lines%
(or %number-programlisting-lines%
(equal? (attribute-string (normalize "linenumbering"))
(normalize "numbered")))))
(element screen
($verbatim-display$
%indent-screen-lines%
(or %number-screen-lines%
(equal? (attribute-string (normalize "linenumbering"))
(normalize "numbered")))))
(element screenshot (process-children))
(element screeninfo (empty-sosofo))
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