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 ((0op #x08) ret_pulled ez-op-ret-pulled)
539 ((1op #x0C) jump ez-op-jump)
540 ((2op #x05) inc_jg ez-op-inc-jg)
541 ((2op #x04) dec_jg ez-op-dec-jg)
542 ((2op #x0D) store ez-op-store)
543 ((1op #x0E) load ez-op-load)
544 ((var #x01) storew ez-op-storew)
545 ((2op #x0F) loadw ez-op-loadw)
546 ((var #x02) storeb ez-op-storeb)
547 ((2op #x10) loadb ez-op-loadb)
548 ((2op #x01) je ez-op-je)
549 ((2op #x02) jl ez-op-jl)
550 ((2op #x03) jg ez-op-jg)
551 ((2op #x06) jin ez-op-jin)
552 ((2op #x07) test ez-op-test)
553 ((2op #x08) or ez-op-or)
554 ((2op #x09) and ez-op-and)
555 ((2op #x14) add ez-op-add)
556 ((2op #x15) sub ez-op-sub)
557 ((2op #x16) mul ez-op-mul)
558 ((2op #x17) div ez-op-div)
559 ((2op #x18) mod ez-op-mod)
560 ((var #x00) call_fv ez-op-callfv)
561 ((1op #x01) get_sibling ez-op-get-sibling)
562 ((1op #x02) get_child ez-op-get-child)
563 ((1op #x03) get_parent ez-op-get-parent)
564 ((2op #x0A) test_attr ez-op-test-attr)
565 ((2op #x0B) set_attr ez-op-set-attr)
566 ((2op #x0C) clear_attr ez-op-clear-attr)
567 ((1op #x09) remove_obj ez-op-remove-obj)
568 ((2op #x0E) insert_obj ez-op-insert-obj)
569 ((var #x03) put_prop ez-op-put-prop)
570 ((2op #x11) get_prop ez-op-get-prop)
571 ((0op #x02) print ez-op-print)
572 ((0op #x0B) new_line ez-op-new-line)
573 ((var #x06) print_num ez-op-print-num)
574 ((var #x05) print_char ez-op-print-char)
575 ((1op #x0A) print_obj ez-op-print-obj)))
577 (defun ez-op-ret (operands &optional operand-types)
578 (let ((retval (car operands)))
579 (message "\tReturning value %x" retval)
580 (ez-pop-call-stack-frame)
581 (ez-set-var (ez-read-pc-byte-and-inc) retval))
584 (defun ez-op-ret-pulled (operands operand-types)
585 (let ((retval (ez-routine-stack-pop)))
586 (message "\tReturning value %x" retval)
587 (ez-op-ret (list retval)))
590 (defun ez-op-rtrue (&optional operands operand-types)
594 (defun ez-op-rfalse (&optional operands operand-types)
598 (defun ez-op-jz (operands operand-types)
599 (ez-do-branch (= (car operands) 0))
602 (defun ez-op-je (operands operand-types)
603 (ez-do-branch (memq (car operands) (cdr operands)))
606 (defun ez-op-jg (operands operand-types)
607 (let ((s1 (ez-decode-signed-operand (car operands) (car operand-types)))
608 (s2 (ez-decode-signed-operand (cadr operands) (cadr operand-types))))
609 (ez-do-branch (> s1 s2)))
612 (defun ez-op-jl (operands operand-types)
613 (let ((s1 (ez-decode-signed-operand (car operands) (car operand-types)))
614 (s2 (ez-decode-signed-operand (cadr operands) (cadr operand-types))))
615 (ez-do-branch (< s1 s2)))
618 (defun ez-op-inc-jg (operands operand-types)
619 (let ((var (car operands)))
620 (ez-op-inc (list var))
621 (ez-op-jg (cons (ez-get-var var) (cdr operands)) (cons 'w (cdr operand-types))))
624 (defun ez-op-dec-jl (operands operand-types)
625 (let ((var (car operands)))
626 (ez-op-dec (list var))
627 (ez-op-jl (cons (ez-get-var var) (cdr operands)) (cons 'w (cdr operand-types))))
630 (defun ez-op-jin (operands operand-types)
631 (let ((obj (car operands))
633 (ez-do-branch (or (= n 0)
634 (= n (ez-get-obj-parent obj)))))
637 (defun ez-op-test (operands operand-types)
638 (let ((a (car operands))
640 (ez-do-branch (= (logand a b) b)))
643 (defun ez-op-jump (operands operand-types)
644 (let ((offset (if (eq (car operand-types) 'b)
645 (ez-decode-signed-byte (car operands))
646 (ez-decode-signed-word (car operands)))))
647 (ez-set-pc (+ (ez-get-pc) offset -2)))
650 (defun ez-op-inc (operands &optional operand-types)
651 (let ((var (car operands)))
652 (ez-set-var var (mod (+ 1 (ez-get-var var)) #x10000)))
655 (defun ez-op-dec (operands &optional operand-types)
656 (let ((var (car operands)))
657 (ez-set-var var (mod (+ (ez-get-var var) 1) #x10000)))
660 (defun ez-op-store (operands operand-types)
661 (let ((var (car operands))
666 (defun ez-op-load (operands operand-types)
667 (let ((var (car operands)))
668 (ez-set-var (ez-read-pc-byte-and-inc) (ez-get-var var)))
671 (defun ez-op-storew (operands operand-types)
672 (let ((baddr (car operands))
674 (a (caddr operands)))
675 (ez-mem-set-word (+ baddr (* 2 n)) a))
678 (defun ez-op-loadw (operands operand-types)
679 (let ((baddr (car operands))
681 (ez-set-var (ez-read-pc-byte-and-inc) (ez-mem-ref-word (+ baddr (* 2 n)))))
684 (defun ez-op-storeb (operands operand-types)
685 (let ((baddr (car operands))
687 (a (caddr operands)))
688 (ez-mem-set-byte (+ baddr n) a))
691 (defun ez-op-loadb (operands operand-types)
692 (let ((baddr (car operands))
694 (ez-set-var (ez-read-pc-byte-and-inc) (ez-mem-ref-byte (+ baddr n))))
697 (defun ez-op-and (operands operand-types)
698 (let ((a (car operands))
700 (ez-set-var (ez-read-pc-byte-and-inc) (logand a b)))
703 (defun ez-op-or (operands operand-types)
704 (let ((a (car operands))
706 (ez-set-var (ez-read-pc-byte-and-inc) (logior a b)))
709 (defun ez-op-add (operands operand-types)
710 (let ((a (car operands))
712 (ez-set-var (ez-read-pc-byte-and-inc) (mod (+ a b) #x10000)))
715 (defun ez-op-sub (operands operand-types)
716 (let ((a (car operands))
718 (ez-set-var (ez-read-pc-byte-and-inc) (mod (+ (- a b) #x10000) #x10000)))
721 (defun ez-op-mul (a b)
722 (let ((a (car operands))
724 (ez-set-var (ez-read-pc-byte-and-inc) (mod (* a b) #x10000)))
727 (defun ez-op-div (a b)
728 (error "Not implemented"))
730 (defun ez-op-mod (a b)
731 (error "Not implemented"))
733 (defun ez-op-callfv (operands operand-types)
734 (let* ((raddr (car operands))
735 (call-operands (cdr operands))
737 (L (ez-mem-ref-byte r))
738 (n (length call-operands))
739 (new-pc (+ r 1 (* L 2))))
741 (ez-set-var (ez-read-pc-byte-and-inc) 0) ; Simply return 0
742 (ez-add-call-stack-frame new-pc)
745 (ez-set-local-var (+ i 1) (elt call-operands i))
746 (ez-set-local-var (+ i 1) (ez-mem-ref-word (+ r 1 (* 2 i))))))))
749 (defun ez-op-test-attr (operands operand-types)
750 (let ((obj (car operands))
751 (attr (cadr operands)))
752 (ez-do-branch (= 1 (ez-get-obj-attr obj attr)))
755 (defun ez-op-set-attr (operands operand-types)
756 (let ((obj (car operands))
757 (attr (cadr operands)))
758 (ez-set-obj-attr obj attr 1))
761 (defun ez-op-clear-attr (operands operand-types)
762 (let ((obj (car operands))
763 (attr (cadr operands)))
764 (ez-set-obj-attr obj attr 0))
767 (defun ez-op-get-sibling (operands operand-types)
768 (let ((sib (ez-get-obj-sibling (car operands))))
769 (ez-set-var (ez-read-pc-byte-and-inc) sib)
770 (ez-do-branch (> sib 0)))
773 (defun ez-op-get-child (operands operand-types)
774 (let ((child (ez-get-obj-child (car operands))))
775 (ez-set-var (ez-read-pc-byte-and-inc) child)
776 (ez-do-branch (> child 0)))
779 (defun ez-op-get-parent (operands operand-types)
780 (let ((parent (ez-get-obj-parent (car operands))))
781 (ez-set-var (ez-read-pc-byte-and-inc) parent))
784 (defun ez-op-remove-obj (operands operand-types)
785 (let ((obj (car operands)))
789 (defun ez-op-insert-obj (operands operand-types)
790 (let ((obj1 (car operands))
791 (obj2 (cadr operands)))
792 (ez-insert-obj obj1 obj2))
795 (defun ez-op-put-prop (operands operand-types)
796 (let* ((obj (car operands))
797 (prop (cadr operands))
798 (a (caddr operands)))
799 (ez-set-obj-prop obj prop a))
802 (defun ez-op-get-prop (operands operand-types)
803 (let* ((obj (car operands))
804 (prop (cadr operands)))
805 (ez-set-var (ez-read-pc-byte-and-inc)
806 (ez-get-obj-prop obj prop)))
809 (defun ez-op-print (operands operand-types)
810 (let* ((word-count-and-string (ez-get-zstring-and-length (ez-get-pc)))
811 (word-count (car word-count-and-string))
812 (string (cdr word-count-and-string)))
814 (ez-increment-pc (* 2 word-count)))
817 (defun ez-op-new-line (operands operand-types)
821 (defun ez-op-print-num (operands operand-types)
822 (let ((s (ez-decode-signed-operand (car operands) (car operand-types))))
823 (ez-print (number-to-string s)))
826 (defun ez-op-print-char (operands operand-types)
827 (let ((c (car operands)))
828 (ez-print (string c)))
831 (defun ez-op-print-obj (operands operand-types)
832 (let ((obj (car operands)))
833 (ez-print (ez-get-obj-name obj)))
838 (defun ez-run (filename)
839 (ez-load-file filename)
841 (setq ez-call-stack (list (ez-make-call-stack-frame ez-start-pc)))
843 (while (ez-execute-instr)))
849 (defvar ez-input-marker nil
850 "Marker for input position in buffer.")
852 (defun ez-setup-buffer ()
853 (with-current-buffer (get-buffer-create "*ez*")
854 (let ((inhibit-read-only t))
855 (delete-region (point-min) (point-max)))
856 (setq-local scroll-conservatively 1)
857 (if (markerp ez-input-marker)
858 (set-marker ez-input-marker (point-max))
859 (setq ez-input-marker (point-max-marker)))
860 (goto-char (point-max))))
863 (defun ez-print (string)
864 (with-current-buffer "*ez*"
866 (goto-char ez-input-marker)
867 (insert-before-markers string))))
872 (let ((map (make-sparse-keymap)))
873 (define-key map (kbd "RET") 'ez-enter)
876 (define-derived-mode ez-mode text-mode "ez"
877 "Major mode for EZ.")
879 (when (fboundp 'evil-set-initial-state)
880 (evil-set-initial-state 'ez-mode 'insert))
883 (interactive "fEnter name of z3 story file: ")
884 (if (get-buffer "*ez*")
885 (switch-to-buffer "*ez*")
886 (switch-to-buffer "*ez*")
894 (switch-to-buffer "*ez*")