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;;; cl-typesetting copyright 2003-2004 Marc Battyani see license.txt for the details
;;; You can reach me at marc.battyani@fractalconcept.com or marc@battyani.net
;;; The homepage of cl-typesetting is here: http://www.fractalconcept.com/asp/html/cl-typesetting.html
(in-package #:typeset)
(defclass hyphen-box ()
((cost :accessor cost :initform 0 :initarg :cost)
(char-box :accessor char-box :initform nil :initarg :char-box)))
(defmethod convert-hyphen-to-char-box ((box hyphen-box))
(char-box box))
(defmethod convert-hyphen-to-char-box (box)
box)
(defmethod cut-point-p (box)
(declare (ignore box))
nil)
(defmethod cut-point-p ((box (eql :eol)))
t)
(defmethod cut-point-p ((box hyphen-box))
t)
(defmethod cut-point-p ((box white-char-box))
t)
(defmethod cut-point-p ((box char-box))
(and (pdf:hyphen-char *font*)(char= (pdf:hyphen-char *font*)(boxed-char box))))
(defun non-empty-style-p (style)
(and (style-p style)
(or (font style)
(font-size style)
(text-x-scale style)
(color style)
(background-color style)
(h-align style)
(left-margin style)
(right-margin style)
(pre-decoration style)
(post-decoration style))))
;;This would need a complete rewrite...
(defmethod fit-lines ((content text-content) dx dy &optional (v-align :top)(advance t))
(let* ((boxes (boxes content))
(boxes-left boxes)
(text-lines ())
(line-boxes ())
(last-cut-point nil)
(last-cut-boxes-left ())
(trimming t)
(last-style (make-instance 'text-style))
(x 0)
(next-x 0)
(last-x dx))
(when (member v-align '(:center :bottom))
(push (make-vfill-glue) text-lines))
(labels ((return-lines (&optional (dy-left dy))
;; Optimize boxes-left slightly by ignoring empty style
(when (and boxes-left (non-empty-style-p last-style))
(push last-style boxes-left))
;; Detect pathology where text-lines is a singleton spurious text-line
;; consisting only of instances of
;; (1) text-style, or
;; (2) h-spacing (including explicit or made by make-hfill-glue).
(cond ((or (null text-lines)
(and (null (rest text-lines))
(every (lambda (box) (or (style-p box)
(typep box 'h-spacing)))
(boxes (first text-lines)))))
(setq text-lines nil))
((member v-align '(:center :top))
(setq text-lines (cons (make-vfill-glue) text-lines))))
(when advance
(setf (boxes-left content) boxes-left))
(return-from fit-lines (values (nreverse text-lines) dy-left)))
(abort-line ()
(setf boxes-left boxes)
(return-lines))
(init-line ()
(save-style last-style)
(setf line-boxes nil last-cut-point nil last-cut-boxes-left nil
trimming t next-x 0 last-x (- dx *right-margin*)))
(start-line ()
(setf last-x (- dx *right-margin*) trimming nil)
(unless (zerop *left-margin*)
(push (make-instance 'h-spacing :dx *left-margin*) line-boxes)
(incf next-x *left-margin*))
(when (member *h-align* '(:center :right))
(push (make-hfill-glue) line-boxes)))
(next-line (line-boxes)
(if line-boxes
(let ((text-line (make-instance 'text-line :dx dx :adjustable-p t)))
(setf line-boxes (boxes-left-trim line-boxes))
(when (member *h-align* '(:center :left :left-not-last))
(push (make-hfill-glue) line-boxes))
(unless (zerop *right-margin*)
(push (make-instance 'h-spacing :dx *right-margin*) line-boxes))
(setf (boxes text-line)(nreverse line-boxes))
(decf dy (dy text-line))
(when (minusp dy) (abort-line))
(setf boxes boxes-left)
(when (and text-lines (not (zerop dy)))
(push (make-inter-line-glue (dy text-line)) text-lines))
(push text-line text-lines))
(setf boxes boxes-left))
(init-line)))
(loop for box = (pop boxes-left)
for box-size = (dx box)
while box
do
(setf next-x (+ x box-size))
(when (and (cut-point-p box)(> x 0))
(setf last-cut-point box
last-cut-boxes-left boxes-left))
(when (and trimming (not (trimmable-p box))(> box-size 0))
(start-line))
(when (style-p box)
(use-style box))
(cond
((vmode-p box)
(next-line line-boxes)
(decf dy (dy box))
(if (minusp dy)
;; try to split object
(multiple-value-bind (box-fitted box-left dy-left) (v-split box dx (+ dy (dy box)))
(when box-left
(push box-left boxes-left))
(when box-fitted
(push box-fitted text-lines))
(return-lines dy-left))
(push box text-lines)))
((and trimming (trimmable-p box)) nil)
((eq box :eol)
(when (eq *h-align* :left-not-last)
;; incredibly ugly hack - need to get rid of the
;; superfluous box added on the last line.
(let ((fbox (find-if (lambda (box)
(and (typep box 'h-spacing)
(eql (expansibility box) +huge-number+)))
line-boxes)))
(if fbox (setq line-boxes (remove fbox line-boxes)))))
(when (eq *h-align* :justified)
(push (make-hfill-glue) line-boxes))
(next-line line-boxes))
((eq box :fresh-page)
(unless (or (null text-lines)
(and (null (rest text-lines))
(every (lambda (box) (or (style-p box)
(typep box 'h-spacing)
(typep box 'v-spacing)))
(boxes (first text-lines)))))
(next-line line-boxes)
(return-lines 0)))
((eq box :eop)
(next-line line-boxes)
(return-lines 0))
((<= next-x last-x) (push box line-boxes))
((and last-cut-point (not (eq box last-cut-point)))
(setf boxes-left last-cut-boxes-left)
(next-line (cons (convert-hyphen-to-char-box last-cut-point)
(cdr (member last-cut-point line-boxes)))))
(t (unless line-boxes (error "could not fit anything"))
(next-line line-boxes) (setf boxes-left (cons box boxes-left))))
(setf x next-x)
finally
(when line-boxes (next-line line-boxes)))
(return-lines))))
(defmethod do-layout (box)
(declare (ignore box))
)
(defmethod do-layout ((hbox hbox))
(loop with dy = (dy hbox) and baseline = (internal-baseline hbox)
for box in (boxes hbox)
do (adjust-box-dy box dy baseline))
(spread-boxes (boxes hbox) (dx hbox) #'dx)
(map nil 'do-layout (boxes hbox)))
(defmethod do-layout ((vbox vbox))
(loop with dx = (dx vbox) and baseline = (internal-baseline vbox)
for box in (boxes vbox)
do (adjust-box-dx box dx baseline))
(spread-boxes (boxes vbox) (dy vbox) #'dy)
(map nil 'do-layout (boxes vbox)))
(defun spread-boxes (boxes final-size size-fn &optional (first-pass t))
(when first-pass
(dolist (box boxes)
(when (soft-box-p box)
(setf (locked box) nil
(delta-size box) 0))))
(multiple-value-bind (size max-expansion expansibility max-compression compressibility)
(compute-boxes-elasticity boxes size-fn)
(let ((final-pass t))
(cond
((and (< size (- final-size +epsilon+)) (> max-expansion +epsilon+))
(let ((delta-size (- final-size size)))
(when (> delta-size max-expansion) (setf delta-size max-expansion))
(setf delta-size (/ delta-size expansibility))
(dolist (box boxes)
(unless (locked box)
(let* ((max-expansion (max-expansion box))
(expansibility (expansibility box))
(box-delta-size (* expansibility delta-size)))
(when (> box-delta-size max-expansion)
(setf (locked box) t
box-delta-size max-expansion
final-pass nil))
(setf (delta-size box) box-delta-size))))))
((and (> size (+ final-size +epsilon+))(> max-compression +epsilon+))
(let ((compression (- size final-size)))
(when (> compression max-compression) (setf compression max-compression))
(setf compression (/ compression compressibility))
(dolist (box boxes)
(unless (locked box)
(let* ((max-compression (max-compression box))
(compressibility (compressibility box))
(box-compression (* compressibility compression)))
(when (> box-compression max-compression)
(setf (locked box) t
box-compression max-compression
final-pass nil))
(setf (delta-size box) (- box-compression))))))))
(unless final-pass
(spread-boxes boxes final-size size-fn nil)))))
(defun boxes-left-trim (boxes)
(let ((start (position-if-not #'trimmable-p boxes)))
(if (and start (> start 0))
(subseq boxes start)
boxes)))
(defun boxes-right-trim (boxes)
(let ((stop (position-if-not #'trimmable-p boxes :from-end t)))
(when stop
(incf stop)
(if (< stop (length boxes))
(subseq boxes 0 stop)
boxes))))
(defun boxes-trim (boxes)
(let ((start (position-if-not #'trimmable-p boxes))
(stop (position-if-not #'trimmable-p boxes :from-end t)))
(when (and start stop)
(incf stop)
(if (or (> start 0)(< stop (length boxes)))
(subseq boxes start stop)
boxes))))
(defmethod boxes-left ((content text-content))
(boxes content))
(defmethod (setf boxes-left) (value (content text-content))
;;; Args: value - can start form a text-style.
(setf (boxes content) value))
(defun make-filled-vbox (content dx dy &optional (v-align :top) (advance t))
;;; Args: advance If true, assign new boxes-left.
(with-text-content (content)
(multiple-value-bind (boxes) (fit-lines content dx dy v-align advance)
(when boxes
(let* ((vbox (make-instance 'vbox :dx dx :dy dy :boxes boxes :fixed-size t)))
(do-layout vbox)
vbox)))))
#+nil
(defun make-filled-vbox (content dx dy &optional (v-align :top))
(with-text-content (content)
(multiple-value-bind (lines boxes-left) (split-lines (boxes content) dx dy v-align)
(when lines
(let* ((box (make-instance 'vbox :dx dx :dy dy :boxes lines :fixed-size t)))
(do-layout box)
(setf (boxes content) boxes-left)
box)))))
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