1 ;;; ez.el --- Emacs Z-machine
3 ;; Copyright (C) 2021 Tim Vaughan
5 ;; Author: Tim Vaughan <timv@ughan.xyz>
6 ;; Created: 13 Oct 2021
9 ;; Homepage: http://thelambdalab.xyz/ez
10 ;; Package-Requires: ((emacs "26"))
12 ;; This file is not part of GNU Emacs.
14 ;; This program is free software: you can redistribute it and/or modify
15 ;; it under the terms of the GNU General Public License as published by
16 ;; the Free Software Foundation, either version 3 of the License, or
17 ;; (at your option) any later version.
19 ;; This program is distributed in the hope that it will be useful,
20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 ;; GNU General Public License for more details.
24 ;; You should have received a copy of the GNU General Public License
25 ;; along with this file. If not, see <http://www.gnu.org/licenses/>.
33 (defun ez-decode-signed-bits (n nbits)
34 (if (= 0 (lsh n (- 1 nbits)))
38 (defun ez-decode-signed-byte (b)
39 (ez-decode-signed-bits b 8))
41 (defun ez-decode-signed-word (w)
42 (ez-decode-signed-bits w 16))
44 (defun ez-decode-signed-operand (operand operand-type)
45 (if (eq operand-type 'b)
46 (ez-decode-signed-byte operand)
47 (ez-decode-signed-word operand)))
49 (defun binformat (n &optional s)
53 (new-s (concat (number-to-string (mod n 2)) s)))
56 (binformat d new-s))))
58 (defun ez-list-to-string-hex (l)
63 (apply 'concat (mapcar (lambda (n) (format " %x" n)) (cdr l)))))
69 "Memory of z-machine.")
71 (defvar ez-version nil)
73 (defvar ez-start-pc nil)
74 (defvar ez-himem-base nil)
75 (defvar ez-dict-base nil)
76 (defvar ez-objtab-addr nil)
77 (defvar ez-abbrevtab-addr nil)
78 (defvar ez-globalvartab-addr nil)
80 (defun ez-mem-ref-byte (addr)
81 (aref ez-memory addr))
83 (defun ez-mem-set-byte (addr val)
84 (aset ez-memory addr val))
86 (defun ez-mem-ref-word (addr)
87 (+ (* 256 (aref ez-memory addr))
88 (aref ez-memory (+ addr 1))))
90 (defun ez-mem-set-word (addr val)
91 (let ((byte-high (/ val 256))
92 (byte-low (mod val 256)))
93 (aset ez-memory addr byte-high)
94 (aset ez-memory (+ addr 1) byte-low)))
96 (defun ez-parse-header ()
97 (setq ez-version (ez-mem-ref-byte #x0))
98 (setq ez-himem-addr (ez-mem-ref-word #x4))
99 (setq ez-start-pc (ez-mem-ref-word #x6))
100 (setq ez-dict-base (ez-mem-ref-word #x8))
101 (setq ez-objtab-addr (ez-mem-ref-word #xA))
102 (setq ez-globalvartab-addr (ez-mem-ref-word #xC))
103 (setq ez-abbrevtab-addr (ez-mem-ref-word #x18)))
105 (defun ez-load-file (filename)
106 "Load story file into memory."
108 (insert-file-contents-literally filename)
109 (setq ez-memory (encode-coding-string (buffer-string) 'raw-text)))
114 (defun ez-get-global-var (gvar)
116 (error "Invalid global variable %d" gvar))
118 (ez-mem-ref-word (+ (* 2 gvar) ez-globalvartab-addr))))
119 (message "\tRetrieved %x from global variable %x" val gvar)
122 (defun ez-set-global-var (gvar val)
123 (ez-mem-set-word (+ (* 2 gvar) ez-globalvartab-addr) val)
124 (message "\tSet global variabl %x to %x" gvar val))
128 (defvar ez-property-defaults nil)
130 (defun ez-load-property-defaults ()
131 (setq ez-property-defaults (make-vector 31 0))
133 (aset ez-property-defaults i (aref ez-memory (+ ez-objtab-addr (* 2 i))))))
135 (defun ez-get-obj-addr (obj)
136 (+ ez-objtab-addr (* 2 31) (* 9 (- obj 1))))
138 (defun ez-get-obj-parent (obj)
139 (let ((addr (ez-get-obj-addr obj)))
140 (ez-mem-ref-byte (+ addr 4))))
142 (defun ez-set-obj-parent (obj new-parent)
143 (let ((addr (ez-get-obj-addr obj)))
144 (ez-mem-set-byte (+ addr 4) new-parent)))
146 (defun ez-get-obj-sibling (obj)
147 (let ((addr (ez-get-obj-addr obj)))
148 (ez-mem-ref-byte (+ addr 5))))
150 (defun ez-set-obj-sibling (obj new-sibling)
151 (let ((addr (ez-get-obj-addr obj)))
152 (ez-mem-set-byte (+ addr 5) new-sibling)))
154 (defun ez-get-obj-child (obj)
155 (let ((addr (ez-get-obj-addr obj)))
156 (ez-mem-ref-byte (+ addr 6))))
158 (defun ez-set-obj-child (obj new-child)
159 (let ((addr (ez-get-obj-addr obj)))
160 (ez-mem-set-byte (+ addr 6) new-child)))
162 (defun ez-get-obj-plist-addr (obj)
163 (let ((addr (ez-get-obj-addr obj)))
164 (ez-mem-ref-word (+ addr 7))))
166 (defun ez-get-obj-name (obj)
167 (let ((plist-addr (ez-get-obj-plist-addr obj)))
168 (if (> (ez-mem-ref-byte plist-addr) 0)
169 (ez-get-zstring (+ 1 (ez-get-obj-plist-addr obj)))
172 (defun ez-get-prop-default (prop)
173 (ez-mem-ref-word (+ ez-objtab-addr (* 2 (+ 1 prop)))))
175 (defun ez-get-prop-len (prop-size-byte)
176 (lsh prop-size-byte -5))
178 (defun ez-get-prop-num (prop-size-byte)
179 (logand #b00011111 prop-size-byte))
181 (defun ez-get-obj-prop-addr (obj prop)
182 (let* ((plist-addr (ez-get-obj-plist-addr obj))
183 (prop-addr (+ plist-addr 1 (* 2 (ez-mem-ref-byte plist-addr))))
184 (size-byte (ez-mem-ref-byte prop-addr)))
185 (while (not (or (= size-byte 0)
186 (= prop (ez-get-prop-num size-byte))))
187 (setq prop-addr (+ prop-addr (ez-get-prop-len size-byte) 2)
188 size-byte (ez-mem-ref-byte prop-addr)))
191 (defun ez-get-obj-prop (obj prop)
192 (let* ((prop-addr (ez-get-obj-prop-addr obj prop))
193 (size-byte (ez-mem-ref-byte prop-addr)))
195 (ez-get-prop-default prop)
196 (let ((prop-len (ez-get-prop-len size-byte))
197 (data-addr (+ prop-addr 1)))
200 (ez-mem-ref-byte data-addr))
202 (ez-mem-ref-word data-addr)))))))
204 (defun ez-set-obj-prop (obj prop value)
205 (let* ((prop-addr (ez-get-obj-prop-addr obj prop))
206 (size-byte (ez-mem-ref-byte prop-addr)))
209 (error "Tried to set non-existant property"))
210 ((= (ez-get-prop-len size-byte) 1)
211 (ez-mem-set-byte (+ prop-addr 1) value))
213 (ez-mem-set-word (+ prop-addr 1) value)))))
215 (defun ez-get-obj-attr (obj attr)
216 (let* ((byte-num (/ attr 8))
217 (bit-num (mod attr 8))
218 (bit-mask (lsh 1 (- 7 bit-num))))
219 (if (> (logand bit-mask (ez-mem-ref-byte (+ (ez-get-obj-addr obj) byte-num))) 0)
223 (defun ez-set-obj-attr (obj attr val)
224 (let* ((byte-num (/ attr 8))
225 (bit-num (mod attr 8))
226 (bit-mask (lsh 1 (- 7 bit-num)))
227 (byte-addr (+ (ez-get-obj-addr obj) byte-num))
228 (byte (ez-mem-ref-byte byte-addr))
229 (current-set (> (logand bit-mask byte) 0)))
230 (if (or (and current-set (= val 0))
231 (and (not current-set) (> val 0)))
232 (ez-mem-set-byte byte-addr (logxor byte bit-mask)))))
235 (defun ez-remove-obj (obj)
236 (let ((parent (ez-get-obj-parent obj))
237 (sibling (ez-get-obj-sibling obj)))
239 (let ((child (ez-get-obj-child parent)))
241 (ez-set-obj-child parent sibling)
242 (while (not (= obj (ez-get-obj-sibling child)))
243 (setq child (ez-get-obj-sibling child)))
244 (ez-set-obj-sibling child (ez-get-obj-sibling obj))))
245 (ez-set-obj-parent obj 0))
246 (ez-set-obj-sibling obj 0)))
248 (defun ez-insert-obj (obj new-parent)
250 (unless (= new-parent 0)
251 (ez-set-obj-sibling obj (ez-get-obj-child new-parent))
252 (ez-set-obj-child new-parent obj)))
256 (defvar ez-zstring-alphabets
259 (list " abcdefghijklmnopqrstuvwxyz"
260 " ABCDEFGHIJKLMNOPQRSTUVWXYZ"
261 " \n0123456789.,!?_#'\"/\\-:()")
262 "Alphabets used by V3")
264 (defun ez-parse-zstring-word (word)
266 (logand (lsh word -10) #b11111)
267 (logand (lsh word -5) #b11111)
268 (logand word #b11111)))
270 (defun ez-get-zstring-chars-and-length (base-addr)
271 (let ((addr base-addr)
276 (let ((components (ez-parse-zstring-word (ez-mem-ref-word addr))))
277 (setq chars (append chars (cdr components)))
278 (setq addr (+ addr 2))
279 (setq word-count (+ word-count 1))
280 (when (= (car components) 1)
281 (setq not-done nil))))
282 (cons word-count chars)))
284 (defun ez-get-zstring-and-length (base-addr)
285 (let* ((word-count-and-chars (ez-get-zstring-chars-and-length base-addr))
286 (word-count (car word-count-and-chars))
287 (chars (cdr word-count-and-chars))
296 (* 2 (ez-mem-ref-word (+ ez-abbrevtab-addr
297 (* 2 (+ (* (- abbrev-char 1) 32) char)))))))
298 (setq s (concat s (cdr (ez-get-zstring-and-length abbrev-addr)))))
299 (setq abbrev-char nil))
300 ((memq char '(1 2 3)) ;Abbreviation
301 (setq abbrev-char char))
303 (setq cur (mod (+ cur 1) 3)))
305 (setq cur (mod (+ 3 (- cur 1)) 3)))
307 (setq s (concat s (substring (elt ez-zstring-alphabets cur)
310 (cons word-count s)))
312 (defun ez-get-zstring (base-addr)
313 (cdr (ez-get-zstring-and-length base-addr)))
318 (defvar ez-call-stack nil)
320 (defun ez-make-call-stack-frame (pc &optional call-method)
326 (defun ez-add-call-stack-frame (pc &optional call-method)
327 (push (ez-make-call-stack-frame pc call-method) ez-call-stack))
329 (defun ez-pop-call-stack-frame ()
332 (defun ez-routine-stack ()
333 (elt (car ez-call-stack) 1))
335 (defun ez-routine-stack-push (val)
336 (let ((frame (car ez-call-stack)))
337 (message "\tPushed %x to stack" val)
338 (setf (elt frame 1) (cons val (elt frame 1)))))
340 (defun ez-routine-stack-pop ()
341 (let* ((frame (car ez-call-stack))
342 (rs-head (car (elt frame 1))))
343 (setf (elt frame 1) (cdr (elt frame 1)))
344 (message "\tPopped %x from stack" rs-head)
347 (defun ez-get-local-var (lvar)
348 (let* ((frame (car ez-call-stack))
349 (val (aref (elt frame 2) (- lvar 1))))
350 (message "\tRetrieved value %x from local variable %x" val lvar)
353 (defun ez-set-local-var (lvar val)
354 (let ((frame (car ez-call-stack)))
355 (message "\tSet local variable %x to %x" lvar val)
356 (aset (elt frame 2) (- lvar 1) val)))
359 (caar ez-call-stack))
361 (defun ez-set-pc (new-pc)
362 (setf (car (car ez-call-stack)) new-pc))
364 (defun ez-increment-pc (inc)
365 (ez-set-pc (+ (ez-get-pc) inc)))
367 (defun ez-read-pc-byte-and-inc ()
368 (let ((res (ez-mem-ref-byte (ez-get-pc))))
372 (defun ez-read-pc-word-and-inc ()
373 (let ((res (ez-mem-ref-word (ez-get-pc))))
377 ;; Instruction execution
379 (defun ez-get-var (var)
382 (ez-routine-stack-pop))
384 (ez-get-local-var var))
386 (ez-get-global-var (- var 16)))))
388 (defun ez-set-var (var val)
391 (ez-routine-stack-push val))
393 (ez-set-local-var var val))
395 (ez-set-global-var (- var 16) val))))
397 (defun ez-read-pc-var-and-inc ()
398 (ez-get-var (ez-read-pc-byte-and-inc)))
400 (defun ez-execute-instr ()
401 (let ((instr-pc (ez-get-pc))
402 (opbyte (ez-read-pc-byte-and-inc))
403 (optype) (opcode) (operands))
405 ((<= #x0 opbyte #x1f)
408 operands (list (ez-read-pc-byte-and-inc)
409 (ez-read-pc-byte-and-inc))
410 operand-types '(b b)))
411 ((<= #x20 opbyte #x3F)
413 opcode (- opbyte #x20)
414 operands (list (ez-read-pc-byte-and-inc)
415 (ez-read-pc-var-and-inc))
416 operand-types '(b w)))
417 ((<= #x40 opbyte #x5F)
419 opcode (- opbyte #x40)
420 operands (list (ez-read-pc-var-and-inc)
421 (ez-read-pc-byte-and-inc))
422 operand-types '(w b)))
423 ((<= #x60 opbyte #x7F)
425 opcode (- opbyte #x60)
426 operands (list (ez-read-pc-var-and-inc)
427 (ez-read-pc-var-and-inc))
428 operand-types '(w w)))
429 ((<= #x80 opbyte #x8F)
431 opcode (- opbyte #x80)
432 operands (list (ez-read-pc-word-and-inc))
434 ((<= #x90 opbyte #x9F)
436 opcode (- opbyte #x90)
437 operands (list (ez-read-pc-byte-and-inc))
439 ((<= #xA0 opbyte #xAF)
441 opcode (- opbyte #xa0)
442 operands (list (ez-read-pc-var-and-inc))
444 ((<= #xB0 opbyte #xBF)
446 opcode (- opbyte #xb0)
449 ((<= #xC0 opbyte #xDF)
451 opcode (- opbyte #xc0))
452 (let ((operands-and-types (ez-read-var-operands-and-inc)))
453 (setq operands (car operands-and-types)
454 operand-types (cdr operands-and-types))))
455 ((<= #xE0 opbyte #xFF)
457 opcode (- opbyte #xe0))
458 (let ((operands-and-types (ez-read-var-operands-and-inc)))
459 (setq operands (car operands-and-types)
460 operand-types (cdr operands-and-types)))))
461 (let ((table-row (assoc (list optype opcode) ez-op-table)))
463 (error "Unsupported op PC:%x Optype:%s Opcode:%x Operands:%s Operand-types:%s"
464 instr-pc optype opcode (ez-list-to-string-hex operands) operand-types))
465 (let ((mnemonic (elt table-row 1)))
466 (message "PC:%x Optype:%s Opcode:%x Mnemonic:%s Operands:%s Operand-types:%s"
467 instr-pc optype opcode mnemonic
468 (ez-list-to-string-hex operands) operand-types))
469 (funcall (elt table-row 2) operands operand-types))))
471 (defun ez-read-var-operands-and-inc ()
472 (let* ((type-byte (ez-read-pc-byte-and-inc))
473 (types (let ((type1 (lsh type-byte -6)))
477 (let ((type2 (mod (lsh type-byte -4) 4)))
481 (let ((type3 (mod (lsh type-byte -2) 4)))
485 (let ((type4 (mod type-byte 4)))
488 (list type4))))))))))))))
493 ((= type 0) (ez-read-pc-word-and-inc))
494 ((= type 1) (ez-read-pc-byte-and-inc))
495 ((= type 2) (ez-read-pc-var-and-inc))))
506 (defun ez-do-branch (branch)
507 (let* ((branch-byte (ez-read-pc-byte-and-inc))
508 (invert (= 0 (logand branch-byte #b10000000)))
509 (single-byte (> (logand branch-byte #b01000000) 0))
512 (logand branch-byte #b00111111)
513 (let ((pos (= (logand branch-byte #b00100000) 0))
514 (val (+ (* 256 (logand branch-byte #b00011111))
515 (ez-read-pc-byte-and-inc))))
519 (if (or (and branch (not invert))
520 (and (not branch) invert))
527 (ez-set-pc (+ (ez-get-pc) offset -2)))))))
532 '(((0op #x00) rtrue ez-op-rtrue)
533 ((0op #x01) rfalse ez-op-rfalse)
534 ((1op #x00) jz ez-op-jz)
535 ((1op #x05) inc ez-op-inc)
536 ((1op #x06) dec ez-op-dec)
537 ((1op #x0B) ret ez-op-ret)
538 ((1op #x0C) jump ez-op-jump)
539 ((2op #x05) inc_jg ez-op-inc-jg)
540 ((2op #x04) dec_jg ez-op-dec-jg)
541 ((2op #x0D) store ez-op-store)
542 ((1op #x0E) load ez-op-load)
543 ((var #x01) storew ez-op-storew)
544 ((2op #x0F) loadw ez-op-loadw)
545 ((var #x02) storeb ez-op-storeb)
546 ((2op #x10) loadb ez-op-loadb)
547 ((2op #x01) je ez-op-je)
548 ((2op #x02) jl ez-op-jl)
549 ((2op #x06) jin ez-op-jin)
550 ((2op #x08) or ez-op-or)
551 ((2op #x09) and ez-op-and)
552 ((2op #x14) add ez-op-add)
553 ((2op #x15) sub ez-op-sub)
554 ((2op #x16) mul ez-op-mul)
555 ((2op #x17) div ez-op-div)
556 ((2op #x18) mod ez-op-mod)
557 ((var #x00) call_fv ez-op-callfv)
558 ((1op #x01) get_sibling ez-op-get-sibling)
559 ((1op #x02) get_child ez-op-get-child)
560 ((1op #x03) get_parent ez-op-get-parent)
561 ((2op #x0A) test_attr ez-op-test-attr)
562 ((2op #x0B) set_attr ez-op-set-attr)
563 ((2op #x0C) clear_attr ez-op-clear-attr)
564 ((1op #x09) remove_obj ez-op-remove-obj)
565 ((2op #x0E) insert_obj ez-op-insert-obj)
566 ((var #x03) put_prop ez-op-put-prop)
567 ((2op #x11) get_prop ez-op-get-prop)
568 ((0op #x02) print ez-op-print)
569 ((0op #x0B) new_line ez-op-new-line)
570 ((var #x06) print_num ez-op-print-num)
571 ((var #x05) print_char ez-op-print-char)
572 ((1op #x0A) print_obj ez-op-print-obj)))
574 (defun ez-op-ret (operands &optional operand-types)
575 (let ((retval (car operands)))
576 (message "\tReturning value %x" retval)
577 (ez-pop-call-stack-frame)
578 (ez-set-var (ez-read-pc-byte-and-inc) retval))
581 (defun ez-op-rtrue (&optional operands operand-types)
585 (defun ez-op-rfalse (&optional operands operand-types)
589 (defun ez-op-jz (operands operand-types)
590 (ez-do-branch (= (car operands) 0))
593 (defun ez-op-je (operands operand-types)
594 (ez-do-branch (memq (car operands) (cdr operands)))
597 (defun ez-op-jg (operands operand-types)
598 (let ((s1 (ez-decode-signed-operand (car operands) (car operand-types)))
599 (s2 (ez-decode-signed-operand (cadr operands) (cadr operand-types))))
600 (ez-do-branch (> s1 s2)))
603 (defun ez-op-jl (operands operand-types)
604 (let ((s1 (ez-decode-signed-operand (car operands) (car operand-types)))
605 (s2 (ez-decode-signed-operand (cadr operands) (cadr operand-types))))
606 (ez-do-branch (< s1 s2)))
609 (defun ez-op-inc-jg (operands operand-types)
610 (let ((var (car operands)))
611 (ez-op-inc (list var))
612 (ez-op-jg (cons (ez-get-var var) (cdr operands)) (cons 'w (cdr operand-types))))
615 (defun ez-op-dec-jl (operands operand-types)
616 (let ((var (car operands)))
617 (ez-op-dec (list var))
618 (ez-op-jl (cons (ez-get-var var) (cdr operands)) (cons 'w (cdr operand-types))))
621 (defun ez-op-jin (operands operand-types)
622 (let ((obj (car operands))
624 (ez-do-branch (or (= n 0)
625 (= n (ez-get-obj-parent obj)))))
628 (defun ez-op-jump (operands operand-types)
629 (let ((offset (if (eq (car operand-types) 'b)
630 (ez-decode-signed-byte (car operands))
631 (ez-decode-signed-word (car operands)))))
632 (ez-set-pc (+ (ez-get-pc) offset -2)))
635 (defun ez-op-inc (operands &optional operand-types)
636 (let ((var (car operands)))
637 (ez-set-var var (mod (+ 1 (ez-get-var var)) #x10000)))
640 (defun ez-op-dec (operands &optional operand-types)
641 (let ((var (car operands)))
642 (ez-set-var var (mod (+ (ez-get-var var) 1) #x10000)))
645 (defun ez-op-store (operands operand-types)
646 (let ((var (car operands))
651 (defun ez-op-load (operands operand-types)
652 (let ((var (car operands)))
653 (ez-set-var (ez-read-pc-byte-and-inc) (ez-get-var var)))
656 (defun ez-op-storew (operands operand-types)
657 (let ((baddr (car operands))
659 (a (caddr operands)))
660 (ez-mem-set-word (+ baddr (* 2 n)) a))
663 (defun ez-op-loadw (operands operand-types)
664 (let ((baddr (car operands))
666 (ez-set-var (ez-read-pc-byte-and-inc) (ez-mem-ref-word (+ baddr (* 2 n)))))
669 (defun ez-op-storeb (operands operand-types)
670 (let ((baddr (car operands))
672 (a (caddr operands)))
673 (ez-mem-set-byte (+ baddr n) a))
676 (defun ez-op-loadb (operands operand-types)
677 (let ((baddr (car operands))
679 (ez-set-var (ez-read-pc-byte-and-inc) (ez-mem-ref-byte (+ baddr n))))
682 (defun ez-op-and (operands operand-types)
683 (let ((a (car operands))
685 (ez-set-var (ez-read-pc-byte-and-inc) (logand a b)))
688 (defun ez-op-or (operands operand-types)
689 (let ((a (car operands))
691 (ez-set-var (ez-read-pc-byte-and-inc) (logior a b)))
694 (defun ez-op-add (operands operand-types)
695 (let ((a (car operands))
697 (ez-set-var (ez-read-pc-byte-and-inc) (mod (+ a b) #x10000)))
700 (defun ez-op-sub (operands operand-types)
701 (let ((a (car operands))
703 (ez-set-var (ez-read-pc-byte-and-inc) (mod (+ (- a b) #x10000) #x10000)))
706 (defun ez-op-mul (a b)
707 (let ((a (car operands))
709 (ez-set-var (ez-read-pc-byte-and-inc) (mod (* a b) #x10000)))
712 (defun ez-op-div (a b)
713 (error "Not implemented"))
715 (defun ez-op-mod (a b)
716 (error "Not implemented"))
718 (defun ez-op-callfv (operands operand-types)
719 (let* ((raddr (car operands))
720 (call-operands (cdr operands))
722 (L (ez-mem-ref-byte r))
723 (n (length call-operands))
724 (new-pc (+ r 1 (* L 2))))
726 (ez-set-var (ez-read-pc-byte-and-inc) 0) ; Simply return 0
727 (ez-add-call-stack-frame new-pc)
730 (ez-set-local-var (+ i 1) (elt call-operands i))
731 (ez-set-local-var (+ i 1) (ez-mem-ref-word (+ r 1 (* 2 i))))))))
734 (defun ez-op-test-attr (operands operand-types)
735 (let ((obj (car operands))
736 (attr (cadr operands)))
737 (ez-do-branch (= 1 (ez-get-obj-attr obj attr)))
740 (defun ez-op-set-attr (operands operand-types)
741 (let ((obj (car operands))
742 (attr (cadr operands)))
743 (ez-set-obj-attr obj attr 1))
746 (defun ez-op-clear-attr (operands operand-types)
747 (let ((obj (car operands))
748 (attr (cadr operands)))
749 (ez-set-obj-attr obj attr 0))
752 (defun ez-op-get-sibling (operands operand-types)
753 (let ((sib (ez-get-obj-sibling (car operands))))
754 (ez-set-var (ez-read-pc-byte-and-inc) sib)
755 (ez-do-branch (> sib 0)))
758 (defun ez-op-get-child (operands operand-types)
759 (let ((child (ez-get-obj-child (car operands))))
760 (ez-set-var (ez-read-pc-byte-and-inc) child)
761 (ez-do-branch (> child 0)))
764 (defun ez-op-get-parent (operands operand-types)
765 (let ((parent (ez-get-obj-parent (car operands))))
766 (ez-set-var (ez-read-pc-byte-and-inc) parent))
769 (defun ez-op-remove-obj (operands operand-types)
770 (let ((obj (car operands)))
774 (defun ez-op-insert-obj (operands operand-types)
775 (let ((obj1 (car operands))
776 (obj2 (cadr operands)))
777 (ez-insert-obj obj1 obj2))
780 (defun ez-op-put-prop (operands operand-types)
781 (let* ((obj (car operands))
782 (prop (cadr operands))
783 (a (caddr operands)))
784 (ez-set-obj-prop obj prop a))
787 (defun ez-op-get-prop (operands operand-types)
788 (let* ((obj (car operands))
789 (prop (cadr operands)))
790 (ez-set-var (ez-read-pc-byte-and-inc)
791 (ez-get-obj-prop obj prop)))
794 (defun ez-op-print (operands operand-types)
795 (let* ((word-count-and-string (ez-get-zstring-and-length (ez-get-pc)))
796 (word-count (car word-count-and-string))
797 (string (cdr word-count-and-string)))
799 (ez-increment-pc (* 2 word-count)))
802 (defun ez-op-new-line (operands operand-types)
806 (defun ez-op-print-num (operands operand-types)
807 (let ((s (ez-decode-signed-operand (car operands) (car operand-types))))
808 (ez-print (number-to-string s)))
811 (defun ez-op-print-char (operands operand-types)
812 (let ((c (car operands)))
813 (ez-print (string c)))
816 (defun ez-op-print-obj (operands operand-types)
817 (let ((obj (car operands)))
818 (ez-print (ez-get-obj-name obj)))
823 (defun ez-run (filename)
824 (ez-load-file filename)
826 (setq ez-call-stack (list (ez-make-call-stack-frame ez-start-pc)))
828 (while (ez-execute-instr)))
834 (defun ez-render-prompt ()
835 (with-current-buffer "*ez*"
836 (let ((update-point (= ez-input-marker (point)))
837 (update-window-points (mapcar (lambda (w)
838 (list (= (window-point w) ez-input-marker)
840 (get-buffer-window-list nil nil t))))
842 (set-marker-insertion-type ez-prompt-marker nil)
843 (set-marker-insertion-type ez-input-marker t)
844 (let ((inhibit-read-only t))
845 (delete-region ez-prompt-marker ez-input-marker)
846 (goto-char ez-prompt-marker)
849 (propertize " " ; Need this to be separate to mark it as rear-nonsticky
852 (set-marker-insertion-type ez-input-marker nil))
853 (goto-char ez-input-marker))))
855 (defvar ez-prompt-marker nil
856 "Marker for prompt position in buffer.")
858 (defvar ez-input-marker nil
859 "Marker for prompt position in buffer.")
861 (defun ez-setup-buffer ()
862 (with-current-buffer (get-buffer-create "*ez*")
863 (let ((inhibit-read-only t))
864 (delete-region (point-min) (point-max)))
865 (setq-local scroll-conservatively 1)
866 (if (markerp ez-prompt-marker)
867 (set-marker ez-prompt-marker (point-max))
868 (setq ez-prompt-marker (point-max-marker)))
869 (if (markerp ez-input-marker)
870 (set-marker ez-input-marker (point-max))
871 (setq ez-input-marker (point-max-marker)))
872 (goto-char (point-max))
876 (defun ez-print (string)
877 (with-current-buffer "*ez*"
879 (goto-char ez-prompt-marker)
880 (insert-before-markers string))))
885 (let ((map (make-sparse-keymap)))
886 (define-key map (kbd "RET") 'ez-enter)
889 (define-derived-mode ez-mode text-mode "ez"
890 "Major mode for EZ.")
892 (when (fboundp 'evil-set-initial-state)
893 (evil-set-initial-state 'ez-mode 'insert))
896 (interactive "fEnter name of z3 story file: ")
897 (if (get-buffer "*ez*")
898 (switch-to-buffer "*ez*")
899 (switch-to-buffer "*ez*")
907 (switch-to-buffer "*ez*")