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(load "cnc.lisp")
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(in-package :so3-cnc)
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(ql:quickload :alexandria)
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(ql:quickload :clem)
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(ql:quickload :cl-ppcre)
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(ql:quickload :parse-float)
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(ql:quickload :xmls)
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(defun reshape-to-2x3 (vs)
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(clem:array->matrix
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(make-array '(2 3)
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:initial-contents (list (list (first vs) (second vs) (third vs))
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(list (fourth vs) (fifth vs) (sixth vs))))))
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(defun make-matrix (a b c d e f) (reshape-to-2x3 (list a b c d e f)))
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(defun make-translate (x &optional (y 0)) (reshape-to-2x3 (list 1 0 x 0 1 y)))
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(defun make-scale (x &optional (y nil)) (reshape-to-2x3 (list x 0 0 0 (if (null y) x y) 0)))
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(defun make-rotate (a &optional (x 0) (y 0))
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(clem:m* (make-translate x y)
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(reshape-to-2x3 (list (cos a) (- (sin a)) (sin a) (cos a) 0 0))
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(make-translate (- x) (- y))
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))
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(defun make-skew-x (a) (reshape-to-2x3 (list 1 (tan a) 0 0 1 0)))
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(defun make-skew-y (a) (reshape-to-2x3 (list 1 0 0 (tan a) 1 0)))
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(defun parse-transform (xform-str)
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(cl-ppcre:register-groups-bind (fun argstr) ("([a-zA-Z]+)\\(([^)]*)\\)" xform-str)
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(apply
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(alexandria:switch (fun :test #'string-equal)
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("matrix" #'make-matrix)
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("translate" #'make-translate)
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("scale" #'make-scale)
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("rotate" #'make-rotate)
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("skewX" #'make-skew-x)
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("skewY" #'make-skew-y)
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)
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(mapcar #'parse-float:parse-float (cl-ppcre:split "[\\s,]+" argstr))
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)))
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(defstruct (svg-machine (:conc-name svgm-))
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(finished-paths '())
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(current-path-rev '()) ; note: current path is actually the reversed current path,
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; with the most recent point being the first element. This is
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; done so that it's fast to add new stuff onto the list
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)
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(defun svgm-cur-xy (svgm)
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(if (null (svgm-current-path-rev svgm))
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(if (null (svgm-finished-paths svgm)) '(0.0 0.0)
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(car (last (first (svgm-finished-paths svgm)))))
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(first (svgm-current-path-rev svgm))))
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(defun to-abs-xy (svgm mode pairs)
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(let* ((cur-xy (svgm-cur-xy svgm))
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(cur-x (first cur-xy))
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(cur-y (second cur-xy)))
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(cons mode (loop for i from 1 to (length pairs)
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for j in pairs
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collect (+ j (if (= (mod i 2) 1) cur-x cur-y))
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))
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))
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(defun to-abs (s svgm)
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(macrolet ((pairs () `(to-abs-xy svgm (char-upcase (first s)) (rest s))))
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(alexandria:switch ((first s))
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(#\m (pairs))
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(#\l (pairs))
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(#\c (pairs))
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(#\s (pairs))
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(#\q (pairs))
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(#\t (pairs))
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(#\h (to-abs-xy svgm #\L (list (second s) 0)))
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(#\v (to-abs-xy svgm #\L (list 0 (second s))))
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(#\a (error "relative arc moves not supported yet"))
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(#\z '(#\Z)) ; z and Z are the same, but we upcase it to make conditionals simpler later
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(otherwise s)
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)))
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(defun push-stanza (svgm sraw)
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"Creates and returns a new svg machine that includes the result of interpreting the given stanza"
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(let* ((s (to-abs sraw svgm))
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(mode (first s))
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(finished (svgm-finished-paths svgm))
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(current (svgm-current-path-rev svgm))
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(cur-xy (svgm-cur-xy svgm))
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(nonempty-current (if (null current) (list cur-xy) current))
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)
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(alexandria:switch (mode)
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(#\M (make-svg-machine
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:finished-paths (if (null current) finished (cons (reverse current) finished))
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:current-path-rev (list (cdr s))
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))
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(#\L (make-svg-machine
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:finished-paths finished
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:current-path-rev (cons (cdr s) nonempty-current)))
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(#\Z (progn
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(when (null current)
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(error "got Z (close path) when there's no current path"))
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(make-svg-machine
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:current-path-rev '()
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:finished-paths (cons (reverse (cons (car (last current)) current)) finished)
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)))
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(otherwise (error "unsupported mode ~A" mode))
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)))
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(defun run-stanzas (stanzas svgm)
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(reduce #'push-stanza stanzas :initial-value svgm))
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(defun normalize-stanza (s)
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"Takes a stanza of the form (MODE ARG0 ARG1 ARG2 ... ARGN) and returns a list of stanzas
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in which each stanza contains only one move with a mode modifier."
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(let* ((mode (car s))
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(target-len (alexandria:switch ((char-downcase mode))
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(#\m 2) (#\z 0) (#\l 2) (#\h 1) (#\v 1) (#\c 6)
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(#\s 4) (#\q 4) (#\t 2) (#\a 7)))
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(args (cdr s))
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(args-len (length args))
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; some modes switch after the first set of arguments; this captures
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; that.
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(mode2 (cond
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((equal mode #\m) #\l)
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((equal mode #\M) #\L)
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(t mode)
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))
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)
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(if (= target-len 0)
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(if (= 0 args-len)
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(list (list mode))
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(error "bad number of arguments for zero-length mode ~A: ~A" mode args-len))
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(progn
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(unless (= 0 (mod args-len target-len))
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(error "bad number of arguments in mode ~A: ~A" mode args-len))
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(labels ((split (a is-first)
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(when (> (length a) 0)
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(cons (cons (if is-first mode mode2) (subseq a 0 target-len))
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(split (subseq a target-len) nil)))))
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(split args t)
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)))))
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(defun load-path-args (stz)
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(when (> (length stz) 0)
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(multiple-value-bind (st end) (cl-ppcre:scan "[\\-]?[0-9]*(\\.[0-9]+|[0-9]*)" stz)
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(cons (parse-float:parse-float (subseq stz st end))
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(load-path-args (string-trim ", " (subseq stz end)))))))
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(defun load-path-stanzas (d)
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(when (> (length d) 0)
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(multiple-value-bind (st end) (cl-ppcre:scan "^[a-zA-Z][^a-zA-Z]*" d)
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(cons
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(cons (char d 0) (load-path-args (subseq d (+ st 1) end)))
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(load-path-stanzas (subseq d end)))
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)))
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(defun load-path-data (d xform-stack)
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(reduce #'append (mapcar #'normalize-stanza (load-path-stanzas d))))
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(defun load-svg-from-xml (data &key (xform-stack nil))
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(when (listp data)
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(let* ((tag (car data))
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(attributes (cadr data))
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(xform-attr (assoc "transform" attributes :test #'string-equal))
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(new-xform-stack (if (null xform-attr)
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xform-stack
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(cons (parse-transform (cadr xform-attr)) xform-stack)))
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(children (cddr data))
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(pathdata (when (string-equal (car tag) "path")
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(load-path-data (cadr (assoc "d" attributes :test #'string-equal)) new-xform-stack))))
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(append pathdata (reduce #'append (mapcar #'load-svg-from-xml children)))
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)))
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(defun load-svg (fname)
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(let* ((svgtxt (alexandria:read-file-into-string fname))
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(svgdata (xmls:parse svgtxt)))
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(load-svg-from-xml svgdata)))
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