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;;; psgml-fs.el --- Format a SGML-file according to a style file
;; Copyright (C) 1995, 2000 Lennart Staflin
;; Author: Lennart Staflin <lenst@lysator.liu.se>
;; Version: $Id: psgml-fs.el,v 1.13 2002/07/14 10:03:26 lenst Exp $
;; Keywords:
;;; 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, 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.
;;;
;;; A copy of the GNU General Public License can be obtained from this
;;; program's author (send electronic mail to lenst@lysator.liu.se) or from
;;; the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA
;;; 02139, USA.
;;;
;;; Commentary:
;; The function `style-format' formats the SGML-file in the current buffer
;; according to the style defined in the file `style.fs' (or the file given
;; by the variable `fs-style').
;; To try it load this file and open the test file example.sgml. Then
;; run the emacs command `M-x style-format'.
;; The style file should contain a single Lisp list. The elements of
;; this list, themsleves lists, describe the style for an element type.
;; The sublists begin with the generic identifier for the element types and
;; the rest of the lists are characteristic/value pairs.
;; E.g. ("p" block t left 4 top 2)
;; Defines the style for p-elements to be blocks with left margin 4 and
;; at least two blank lines before the block.
;;; Code:
(require 'psgml-api)
(eval-when-compile (require 'cl)
(require 'ps-print))
;;;; Formatting parameters
(defvar fs-char
'((left . 0)
(first . nil)
(default-top . 0)
(default-bottom . 0)
(ignore-empty-para . nil)
(literal . nil)))
(defvar fs-special-styles
'(top bottom before after hang-from text sub-style title)
"Style attributes that should not be entered in the characteristics table.")
;;; Dynamic variables
(defvar fs-current-element nil)
(defvar fs-buffer)
;;;; Formatting engine
(defun fs-char (p)
(cdr (assq p fs-char)))
(defun fs-set-char (p val)
(setcdr (assq p fs-char) val))
(defsetf fs-char fs-set-char)
(defvar fs-para-acc ""
"Accumulate text of paragraph")
(defvar fs-hang-from nil
"Hanging indent of current paragraph")
(defvar fs-first-indent nil)
(defvar fs-left-indent nil)
(defvar fs-vspace 0
"Vertical space after last paragraph")
(defvar fs-filename)
(defvar fs-title)
(defun fs-add-output (str &optional just)
(save-excursion
(set-buffer fs-buffer)
(goto-char (point-max))
(let ((start (point)))
(insert str)
(when just
(set-justification start (point) just)))))
(defun fs-addvspace (n)
(when (> n fs-vspace)
(fs-add-output (make-string (- n fs-vspace) ?\n))
(setq fs-vspace n)))
(defun fs-para ()
(when (if (fs-char 'ignore-empty-para)
(string-match "[^\t\n ]" fs-para-acc)
fs-left-indent)
(assert fs-left-indent)
(fs-output-para fs-para-acc fs-first-indent fs-left-indent
fs-hang-from
(fs-char 'literal))
(setq fs-vspace 0
fs-hang-from nil))
(setq fs-para-acc ""
fs-first-indent nil
fs-left-indent nil))
(defun fs-paraform-data (data)
(unless fs-left-indent
(setq fs-left-indent (fs-char 'left)
fs-first-indent (fs-char 'first)))
(let ((face (fs-char 'face)))
(when face
(setq data (copy-sequence data))
(put-text-property 0 (length data)
'face face data))
(setq fs-para-acc (concat fs-para-acc data))))
(defun fs-output-para (text first-indent indent hang-from literal)
(sgml-push-to-string text)
(let ((indent-tabs-mode nil)
(fill-prefix (make-string indent ? )))
(cond
(literal
(goto-char (point-max))
(unless (bolp)
(insert ?\n))
(goto-char (point-min))
(while (not (eobp))
(insert fill-prefix)
(beginning-of-line 2)))
(t
(while (re-search-forward "[ \t\n\r]+" nil t)
(replace-match " "))
(goto-char (point-min))
(delete-horizontal-space)
(insert
(if hang-from
hang-from
(make-string (or first-indent indent) ? )))
(fill-region-as-paragraph (point-min) (point-max))
(goto-char (point-max))
(unless (bolp)
(insert ?\n))))
(fs-add-output (buffer-string) (fs-char 'justification)))
(sgml-pop-entity)
(sit-for 0))
(defun fs-paraform-phrase (e)
(sgml-map-content e
(function fs-paraform-phrase)
(function fs-paraform-data)
nil
(function fs-paraform-entity)))
(defun fs-paraform-entity (entity)
(let ((entity-map (fs-char 'entity-map))
(text nil))
(when entity-map
(setq text
(loop for (name val) on entity-map by 'cddr
thereis (if (equal name (sgml-entity-name entity))
val))))
(unless text
(setq text (sgml-entity-text entity)))
(fs-paraform-data text)))
;;;; Style driven engine
(defvar fs-style "style.fs"
"*Style sheet to use for `style-format'.
The value can be the style-sheet list, or it can be a file name
\(string) of a file containing the style sheet or it can be the name
\(symbol) of a variable containing the style sheet.")
(put 'fs-style 'variable-interactive
"fStyle file: ")
(defvar fs-cached-styles nil)
(defun fs-get-style (style)
(cond ((stringp style)
(sgml-cache-catalog style
'fs-cached-styles
(function (lambda ()
(read (current-buffer))))))
((symbolp style)
(fs-get-style (symbol-value style)))
((listp style)
style)
(t
(error "Illegal style value: %s" style))))
(defun fs-engine (e)
(fs-do-style e
(cdr (or (assoc (sgml-element-gi e) fs-style)
(assq t fs-style)))))
(defun fs-do-style (fs-current-element style)
(let ((hang-from (eval (plist-get style 'hang-from))))
(when hang-from
(setq fs-hang-from
(format "%s%s "
(make-string
(or (fs-char 'hang-left) (fs-char 'left))
? )
hang-from))))
(let ((fs-char (nconc
(loop for st on style by 'cddr
unless (memq (car st) fs-special-styles)
collect (cons (car st)
(eval (cadr st))))
fs-char)))
(when (plist-get style 'block)
(fs-para)
(fs-addvspace (or (plist-get style 'top)
(fs-char 'default-top))))
(let ((before (plist-get style 'before)))
(when before
(fs-do-style e before)))
(let ((fs-style
(append (plist-get style 'sub-style)
fs-style)))
(cond ((plist-get style 'text)
(let ((text (eval (plist-get style 'text))))
(when (stringp text)
(fs-paraform-data text))))
(t
(sgml-map-content e
(function fs-engine)
(function fs-paraform-data)
nil
(function fs-paraform-entity)))))
(let ((title (plist-get style 'title)))
(when title
(setq title (eval title))
(save-excursion
(set-buffer fs-buffer)
(setq fs-title title))))
(let ((after (plist-get style 'after)))
(when after
(fs-do-style e after)))
(when (plist-get style 'block)
(fs-para)
(fs-addvspace (or (plist-get style 'bottom)
(fs-char 'default-bottom))))))
(defun fs-clear ()
(setq fs-para-acc ""
fs-hang-from nil
fs-first-indent nil
fs-left-indent nil
fs-vspace 0) )
(defun fs-setup-buffer ()
(save-excursion
(let ((orig-filename (buffer-file-name (current-buffer))))
(set-buffer fs-buffer)
(erase-buffer)
(setq ps-left-header
'(fs-title fs-filename))
(make-local-variable 'fs-filename)
(setq fs-filename (file-name-nondirectory orig-filename))
(make-local-variable 'fs-title)
(setq fs-title ""))))
(defun fs-wrapper (buffer-name thunk)
(fs-clear)
(let ((fs-style (fs-get-style fs-style))
(fs-buffer (get-buffer-create buffer-name)))
(fs-setup-buffer)
(funcall thunk)
(fs-para)
(save-excursion
(set-buffer fs-buffer)
(goto-char (point-min)))
fs-buffer))
;;;###autoload
(defun style-format ()
(interactive)
(fs-wrapper "*Formatted*"
(lambda ()
(display-buffer fs-buffer)
(fs-engine (sgml-top-element)))))
;;;; Helper functions for use in style sheet
(defun fs-element (&rest moves)
"Find current or related element."
(let ((element fs-current-element))
(while moves
(case (pop moves)
(parent (setq element (sgml-element-parent element)))
(next (setq element (sgml-element-next element)))
(child (setq element (sgml-element-content element)))))
element))
(defun fs-element-content (&optional e)
(unless e (setq e (fs-element)))
(let ((fs-para-acc "") fs-first-indent fs-left-indent)
(sgml-map-content e
(function fs-paraform-phrase)
(function fs-paraform-data)
nil
(function fs-paraform-entity))
fs-para-acc))
(defun fs-attval (name &optional element)
(sgml-element-attval (if element element (fs-element))
name))
(defun fs-child-number (&optional element)
(let* ((element (or element (fs-element)))
(parent (sgml-element-parent element))
(child (sgml-element-content parent))
(number 0))
(while (and child (not (eq child element)))
(incf number)
(setq child (sgml-element-next child)))
number))
(defun fs-element-with-id (id)
(block func
(let ((element (sgml-top-element)))
(while (not (sgml-off-top-p element))
(let ((attlist (sgml-element-attlist element)))
(loop for attdecl in attlist
if (eq 'ID (sgml-attdecl-declared-value attdecl))
do (if (compare-strings id nil nil
(sgml-element-attval
element (sgml-attdecl-name attdecl))
nil nil)
(return-from func element))))
;; Next element
(if (sgml-element-content element)
(setq element (sgml-element-content element))
(while (null (sgml-element-next element))
(setq element (sgml-element-parent element))
(if (sgml-off-top-p element)
(return-from func nil)))
(setq element (sgml-element-next element)))))
nil))
(defun fs-split-tokens (s)
"Split a string S into a list of tokens."
(let ((result nil))
(sgml-push-to-string s)
(while (not (eobp))
(skip-syntax-forward "-")
(let ((start (point)))
(skip-syntax-forward "^-")
(when (/= start (point))
(push (buffer-substring-no-properties start (point))
result))))
(sgml-pop-entity)
(nreverse result)))
;;; fs.el ends here
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