emacs/lisp/ps-def.el

;;; ps-def.el --- XEmacs and Emacs definitions for ps-print -*- lexical-binding: t -*-

;; Copyright (C) 2007-2018 Free Software Foundation, Inc.

;; Author: Vinicius Jose Latorre <viniciusjl.gnu@gmail.com>
;;	Kenichi Handa <handa@m17n.org> (multi-byte characters)
;; Maintainer: Kenichi Handa <handa@m17n.org> (multi-byte characters)
;;	Vinicius Jose Latorre <viniciusjl.gnu@gmail.com>
;; Keywords: wp, print, PostScript
;; X-URL: http://www.emacswiki.org/cgi-bin/wiki/ViniciusJoseLatorre
;; Package: ps-print

;; This file is part of GNU Emacs.

;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; See ps-print.el for documentation.

;;; Code:

(declare-function ps-plot-with-face "ps-print" (from to face))
(declare-function ps-plot-string    "ps-print" (string))

(defvar ps-bold-faces)                  ; in ps-print.el
(defvar ps-italic-faces)



;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; XEmacs Definitions


(cond
 ((featurep 'xemacs)			; XEmacs

  ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  ;; ps-bdf

  (defvar installation-directory nil)
  (defvar coding-system-for-read)

  ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  ;; ps-mule

  (or (fboundp 'charset-dimension)
      (defun charset-dimension (_charset) 1)) ; ascii

  (or (fboundp 'char-width)
      (defun char-width (_char) 1))	; ascii

  (or (fboundp 'encode-char)
      (defun encode-char (ch _ccs)
	ch))

  ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  ;; ps-print

  ;; GNU Emacs
  (or (fboundp 'line-beginning-position)
      (defun line-beginning-position (&optional n)
	(save-excursion
	  (and n (/= n 1) (forward-line (1- n)))
	  (beginning-of-line)
	  (point))))


  ;; GNU Emacs
  (or (fboundp 'find-composition)
      (defalias 'find-composition 'ignore))


  (defun ps-xemacs-color-name (color)
    (if (color-specifier-p color)
	(color-name color)
      color))


  (defalias 'ps-mark-active-p 'region-active-p)


  (defun ps-face-foreground-name (face)
    (ps-xemacs-color-name (face-foreground face)))


  (defun ps-face-background-name (face)
    (ps-xemacs-color-name (face-background face)))


  (defalias 'ps-frame-parameter 'frame-property)


  ;; Return t if the device (which can be changed during an emacs session)
  ;; can handle colors.
  (defun ps-color-device ()
    (eq (device-class) 'color))

  (defun ps-mapper (extent list)
    (nconc list
	   (list (list (extent-start-position extent) 'push extent)
		 (list (extent-end-position extent) 'pull extent)))
    nil)


  (defun ps-extent-sorter (a b)
    (< (extent-priority a) (extent-priority b)))


  (defun ps-xemacs-face-kind-p (face kind kind-regex)
    (let* ((frame-font (or (face-font-instance face)
			   (face-font-instance 'default)))
	   (kind-cons
	    (and frame-font
		 (assq kind
		       (font-instance-properties frame-font))))
	   (kind-spec (cdr-safe kind-cons))
	   (case-fold-search t))
      (and kind-spec (string-match kind-regex kind-spec))))


  ;; to avoid XEmacs compilation gripes
  (defvar coding-system-for-write)
  (defvar buffer-file-coding-system)


  (and (fboundp 'find-coding-system)
       (or (funcall 'find-coding-system 'raw-text-unix)
	   (funcall 'copy-coding-system 'no-conversion-unix 'raw-text-unix)))


  (defun ps-color-values (x-color)
    (let ((color (ps-xemacs-color-name x-color)))
      (cond
       ((fboundp 'x-color-values)
	(funcall 'x-color-values color))
       ((and (fboundp 'color-instance-rgb-components)
	     (ps-color-device))
	(funcall 'color-instance-rgb-components
		 (if (color-instance-p x-color)
		     x-color
		   (make-color-instance color))))
       (t
	(error "No available function to determine X color values")))))


  (defun ps-face-bold-p (face)
    (or (ps-xemacs-face-kind-p face 'WEIGHT_NAME "bold\\|demibold")
	(memq face ps-bold-faces)))	; Kludge-compatible


  (defun ps-face-italic-p (face)
    (or (ps-xemacs-face-kind-p face 'ANGLE_NAME "i\\|o")
	(ps-xemacs-face-kind-p face 'SLANT "i\\|o")
	(memq face ps-italic-faces)))	; Kludge-compatible


  (defalias 'ps-face-strikeout-p 'ignore)


  (defalias 'ps-face-overline-p 'ignore)


  (defalias 'ps-face-box-p 'ignore)


  ;; XEmacs will have to make do with %s (princ) for floats.
  (defvar ps-color-format "%s %s %s")
  (defvar ps-float-format "%s ")


  (defun ps-generate-postscript-with-faces1 (from to)
    ;; Generate some PostScript.
    (let ((face 'default)
	  (position to)
	  ;; XEmacs
	  ;; Build the list of extents...
	  (a (cons 'dummy nil))
	  record type extent extent-list)
      (map-extents 'ps-mapper nil from to a)
      (setq a (sort (cdr a) 'car-less-than-car)
	    extent-list nil)

      ;; Loop through the extents...
      (while a
	(setq record (car a)
	      position (car record)

	      record (cdr record)
	      type (car record)

	      record (cdr record)
	      extent (car record))

	;; Plot up to this record.
	;; XEmacs 19.12: for some reason, we're getting into a
	;; situation in which some of the records have
	;; positions less than 'from'.  Since we've narrowed
	;; the buffer, this'll generate errors.  This is a hack,
	;; but don't call ps-plot-with-face unless from > point-min.
	(and (>= from (point-min))
	     (ps-plot-with-face from (min position (point-max)) face))

	(cond
	 ((eq type 'push)
	  (and (extent-face extent)
	       (setq extent-list (sort (cons extent extent-list)
				       'ps-extent-sorter))))

	 ((eq type 'pull)
	  (setq extent-list (sort (delq extent extent-list)
				  'ps-extent-sorter))))

	(setq face (if extent-list
		       (extent-face (car extent-list))
		     'default)
	      from position
	      a (cdr a)))

      (ps-plot-with-face from to face)))

  )
 (t					; Emacs
  ;; Do nothing
  ))					; end cond featurep



;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Emacs Definitions


(cond
 ((featurep 'xemacs)			; XEmacs
  ;; Do nothing
  )
 (t					; Emacs


  ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  ;; ps-print


  (defun ps-mark-active-p ()
    mark-active)


  (defun ps-face-foreground-name (face)
    (face-foreground face nil t))


  (defun ps-face-background-name (face)
    (face-background face nil t))


  (defalias 'ps-frame-parameter 'frame-parameter)


  ;; Return t if the device (which can be changed during an emacs session) can
  ;; handle colors.  This function is not yet implemented for GNU emacs.
  (defun ps-color-device ()
    (if (fboundp 'color-values)
	(funcall 'color-values "Green")
      t))


  (defun ps-color-values (x-color)
    (cond
     ((fboundp 'color-values)
      (funcall 'color-values x-color))
     ((fboundp 'x-color-values)
      (funcall 'x-color-values x-color))
     (t
      (error "No available function to determine X color values"))))


  (defun ps-face-bold-p (face)
    (or (face-bold-p face)
	(memq face ps-bold-faces)))


  (defun ps-face-italic-p (face)
    (or (face-italic-p face)
	(memq face ps-italic-faces)))


  (defun ps-face-strikeout-p (face)
    (eq (face-attribute face :strike-through) t))


  (defun ps-face-overline-p (face)
    (eq (face-attribute face :overline) t))


  (defun ps-face-box-p (face)
    (not (memq (face-attribute face :box) '(nil unspecified))))


  ;; Emacs understands the %f format; we'll use it to limit color RGB values
  ;; to three decimals to cut down some on the size of the PostScript output.
  (defvar ps-color-format "%0.3f %0.3f %0.3f")
  (defvar ps-float-format "%0.3f ")


  (defun ps-generate-postscript-with-faces1 (from to)
    ;; Generate some PostScript.
    (let ((face 'default)
	  (position to)
	  ;; Emacs
	  (property-change from)
	  (overlay-change from)
	  before-string after-string)
      (while (< from to)
	(and (< property-change to)	; Don't search for property change
					; unless previous search succeeded.
	     (setq property-change (next-property-change from nil to)))
	(and (< overlay-change to)	; Don't search for overlay change
					; unless previous search succeeded.
	     (setq overlay-change (min (next-overlay-change from)
				       to)))
	(setq position (min property-change overlay-change)
	      before-string nil
	      after-string nil)
	(setq face
	      (cond ((invisible-p from)
		     'emacs--invisible--face)
		    ((get-char-property from 'face))
		    (t 'default)))
	;; Plot up to this record.
	(and before-string
	     (ps-plot-string before-string))
	(ps-plot-with-face from position face)
	(and after-string
	     (ps-plot-string after-string))
	(setq from position))
      (ps-plot-with-face from to face)))

  ))					; end cond featurep


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(provide 'ps-def)

;;; ps-def.el ends here