/usr/share/gnucash/scm/html-style-sheet.scm is in gnucash-common 1:2.6.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;; html-style-sheet.scm : generate HTML programmatically, with support
;; for simple style elements.
;; Copyright 2000 Bill Gribble <grib@gnumatic.com>
;;
;; 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, contact:
;;
;; Free Software Foundation Voice: +1-617-542-5942
;; 51 Franklin Street, Fifth Floor Fax: +1-617-542-2652
;; Boston, MA 02110-1301, USA gnu@gnu.org
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define *gnc:_style-sheet-templates_* (make-hash-table 23))
(define *gnc:_style-sheets_* (make-hash-table 23))
(define <html-style-sheet-template>
(make-record-type "<html-style-sheet-template>"
'(version name options-generator renderer)))
(define gnc:html-style-sheet-template?
(record-predicate <html-style-sheet-template>))
(define gnc:html-style-sheet-template-version
(record-accessor <html-style-sheet-template> 'version))
(define gnc:html-style-sheet-template-set-version!
(record-modifier <html-style-sheet-template> 'version))
(define gnc:html-style-sheet-template-name
(record-accessor <html-style-sheet-template> 'name))
(define gnc:html-style-sheet-template-set-name!
(record-modifier <html-style-sheet-template> 'name))
(define gnc:html-style-sheet-template-options-generator
(record-accessor <html-style-sheet-template> 'options-generator))
(define gnc:html-style-sheet-template-set-options-generator!
(record-modifier <html-style-sheet-template> 'options-generator))
(define gnc:html-style-sheet-template-renderer
(record-accessor <html-style-sheet-template> 'renderer))
(define gnc:html-style-sheet-template-set-renderer!
(record-modifier <html-style-sheet-template> 'renderer))
(define (gnc:html-style-sheet-template-find tname)
(hash-ref *gnc:_style-sheet-templates_* tname))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; define-html-style-sheet
;; actually defines an <html-style-sheet-template>.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define (gnc:define-html-style-sheet . args)
(let ((ss
((record-constructor <html-style-sheet-template>) #f #f #f #f)))
(let loop ((left args))
(if (and (list? left)
(not (null? left))
(not (null? (cdr left))))
(let* ((field (car left))
(value (cadr left))
(mod (record-modifier <html-style-sheet-template> field)))
(mod ss value)
(loop (cddr left)))))
;; store the style sheet template
(hash-set! *gnc:_style-sheet-templates_*
(gnc:html-style-sheet-template-name ss)
ss)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; <html-style-sheet> methods
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define <html-style-sheet>
(make-record-type "<html-style-sheet>"
'(name type options renderer style)))
(define gnc:html-style-sheet?
(record-predicate <html-style-sheet>))
(define gnc:html-style-sheet-name
(record-accessor <html-style-sheet> 'name))
(define gnc:html-style-sheet-set-name!
(record-modifier <html-style-sheet> 'name))
(define gnc:html-style-sheet-type
(record-accessor <html-style-sheet> 'type))
(define gnc:html-style-sheet-set-type!
(record-modifier <html-style-sheet> 'type))
(define gnc:html-style-sheet-options
(record-accessor <html-style-sheet> 'options))
(define gnc:html-style-sheet-set-options!
(record-modifier <html-style-sheet> 'options))
(define gnc:html-style-sheet-renderer
(record-accessor <html-style-sheet> 'renderer))
(define gnc:html-style-sheet-set-renderer!
(record-modifier <html-style-sheet> 'renderer))
(define gnc:make-html-style-sheet-internal
(record-constructor <html-style-sheet>))
(define gnc:html-style-sheet-style
(record-accessor <html-style-sheet> 'style))
(define gnc:current-saved-stylesheets
(gnc-build-dotgnucash-path "stylesheets-2.0"))
(define (gnc:save-style-sheet-options)
(let ((port (false-if-exception
(open gnc:current-saved-stylesheets
(logior O_WRONLY O_CREAT O_TRUNC)))))
(if (not port)
(gnc:warn (_ "Can't save style sheet"))
(begin
(hash-fold
(lambda (id ss-obj p)
(let ((code
(string-append
(format #f "(let ((template (gnc:html-style-sheet-template-find ~S)))\n"
(gnc:html-style-sheet-type ss-obj))
" (if template \n"
" (let ((options ((gnc:html-style-sheet-template-options-generator template)))) \n"
(gnc:generate-restore-forms
(gnc:html-style-sheet-options ss-obj) "options")
(format #f " (gnc:restore-html-style-sheet ~S ~S options))))\n"
(gnc:html-style-sheet-name ss-obj)
(gnc:html-style-sheet-type ss-obj)))))
(display code port))
#f) #f *gnc:_style-sheets_*)
(close port)))))
(define (gnc:html-style-sheet-set-style! sheet tag . rest)
(let ((newstyle #f))
(if (and (= (length rest) 2)
(procedure? (car rest)))
(set! newstyle
(apply gnc:make-html-data-style-info rest))
(set! newstyle
(apply gnc:make-html-markup-style-info rest)))
(gnc:html-style-table-set!
(gnc:html-style-sheet-style sheet) tag newstyle)))
(define (gnc:make-html-style-sheet template-name style-sheet-name)
(let* ((template (gnc:html-style-sheet-template-find template-name)))
(if template
(let ((rv (gnc:make-html-style-sheet-internal
style-sheet-name template-name
((gnc:html-style-sheet-template-options-generator template))
(gnc:html-style-sheet-template-renderer template)
(gnc:make-html-style-table))))
;; set up the fallback data styles for every rendered document
(gnc:html-style-sheet-set-style!
rv "<string>"
gnc:default-html-string-renderer #f)
(gnc:html-style-sheet-set-style!
rv "<gnc-numeric>"
gnc:default-html-gnc-numeric-renderer #f)
(gnc:html-style-sheet-set-style!
rv "<number>"
gnc:default-html-number-renderer #f)
(gnc:html-style-sheet-set-style!
rv "<gnc-monetary>"
gnc:default-html-gnc-monetary-renderer #f)
;; store it in the style sheet hash
(hash-set! *gnc:_style-sheets_* style-sheet-name rv)
rv)
#f)))
(define (gnc:restore-html-style-sheet style-sheet-name template-name options)
(let* ((template (gnc:html-style-sheet-template-find template-name)))
(if template
(let ((rv (gnc:make-html-style-sheet-internal
style-sheet-name template-name
options
(gnc:html-style-sheet-template-renderer template)
(gnc:make-html-style-table))))
;; set up the fallback data styles for every rendered document
(gnc:html-style-sheet-set-style!
rv "<string>"
gnc:default-html-string-renderer #f)
(gnc:html-style-sheet-set-style!
rv "<gnc-numeric>"
gnc:default-html-gnc-numeric-renderer #f)
(gnc:html-style-sheet-set-style!
rv "<number>"
gnc:default-html-number-renderer #f)
(gnc:html-style-sheet-set-style!
rv "<gnc-monetary>"
gnc:default-html-gnc-monetary-renderer #f)
;; store it in the style sheet hash
(hash-set! *gnc:_style-sheets_* style-sheet-name rv)
rv)
#f)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; html-style-sheet-render
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define (gnc:html-style-sheet-render sheet doc . rest)
;; render the document (returns an <html-document>)
(let ((newdoc ((gnc:html-style-sheet-renderer sheet)
(gnc:html-style-sheet-options sheet)
doc))
(headers? (if (null? rest) #f (if (car rest) #t #f))))
;; Copy values over to stylesheet-produced document. note that this is a
;; bug that should probably better be fixed by having the stylesheets
;; emit documents that are correct. this, however, is a slightly easier
;; place to enforce it. :p
(gnc:html-document-set-title! newdoc (gnc:html-document-title doc))
(gnc:html-document-set-headline! newdoc (gnc:html-document-headline doc))
;; push the style sheet's default styles
(gnc:html-document-push-style newdoc (gnc:html-style-sheet-style sheet))
;; swap the original document's default styles with the style
;; sheet document styles
;; ... first push the style sheet template document's style on the
;; stack (compiling before pushing)
(gnc:html-style-table-compile (gnc:html-document-style newdoc)
(gnc:html-document-style-stack newdoc))
(gnc:html-document-push-style newdoc (gnc:html-document-style newdoc))
;; ... then set the rendered document's style to be the user
;; document style, which will get pushed when the trivial style
;; sheet renders it
(gnc:html-document-set-style-internal!
newdoc (gnc:html-document-style doc))
;; render the ssdocument (using the trivial stylesheet). since
;; the objects from 'doc' are now in newdoc, this renders the whole
;; package.
(gnc:html-document-render newdoc headers?)))
(define (gnc:get-html-style-sheets)
(let* ((ss '()))
(hash-for-each (lambda (k v) (set! ss (cons v ss)))
*gnc:_style-sheets_*)
(sort ss
(lambda (a b)
(string<? (gnc:html-style-sheet-name a)
(gnc:html-style-sheet-name b))))))
(define (gnc:get-html-templates)
(let* ((ss '()))
(hash-for-each (lambda (k v)
(set! ss (cons v ss)))
*gnc:_style-sheet-templates_*)
(sort ss
(lambda (a b)
(string<? (gnc:html-style-sheet-template-name a)
(gnc:html-style-sheet-template-name b))))))
(define (gnc:html-style-sheet-find tname)
(hash-ref *gnc:_style-sheets_* tname))
(define (gnc:html-style-sheet-remove sheet)
(if (not (string=? (gnc:html-style-sheet-name sheet) (N_ "Default")))
(hash-remove! *gnc:_style-sheets_* (gnc:html-style-sheet-name sheet))))
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