Added put_prop operation.

[ez.git] / ez.el

diff --git a/ez.el b/ez.el
index f1ef37e..67e9caf 100644 (file)
--- a/ez.el
+++ b/ez.el
@@ -93,7 +93,8 @@
   "Load story file into memory."
   (with-temp-buffer
     (insert-file-contents-literally filename)
-    (setq ez-memory (encode-coding-string (buffer-string) 'raw-text))))
+    (setq ez-memory (encode-coding-string (buffer-string) 'raw-text)))
+  'done)
 
 ;; Global variables
 
@@ -152,6 +153,48 @@
            (ez-get-zstring (+ 1 plist-addr))
          nil)))))
 
+(defun ez-get-prop-default (prop)
+  (ez-mem-ref-word (+ ez-objtab-addr (* 2 (+ 1 prop)))))
+
+(defun ez-get-prop-len (prop-size-byte)
+  (lsh prop-size-byte -5))
+
+(defun ez-get-prop-num (prop-size-byte)
+  (logand #b00011111 prop-size-byte))
+
+(defun ez-get-obj-prop-addr (obj prop)
+  (let* ((plist-addr (ez-get-obj-plist-addr obj))
+         (prop-addr (+ plist-addr 1 (* 2 (ez-mem-ref-byte plist-addr))))
+         (size-byte (ez-mem-ref-byte prop-addr)))
+    (while (not (or (= size-byte 0)
+                    (= prop (ez-get-prop-num size-byte))))
+      (setq prop-addr (+ prop-addr (ez-get-prop-len size-byte) 2)
+            size-byte (ez-mem-ref-byte prop-addr)))
+    prop-addr))
+
+(defun ez-get-obj-prop (obj prop)
+  (let* ((prop-addr (ez-get-obj-prop-addr obj prop))
+         (size-byte (ez-mem-ref-byte prop-addr)))
+    (if (= prop-addr 0)
+        (ez-get-prop-default prop)
+      (let ((prop-len (ez-get-prop-len size-byte))
+            (data-addr (+ prop-addr 1)))
+        (cond
+         ((= prop-len 0)
+          (ez-mem-ref-byte data-addr))
+         ((>= prop-len 1)
+          (ez-mem-ref-word data-addr)))))))
+
+(defun ez-set-obj-prop (obj prop value)
+  (let* ((prop-addr (ez-get-obj-prop-addr obj prop))
+         (size-byte (ez-mem-ref-byte prop-addr)))
+    (cond
+     ((= size-byte 0)
+      (error "Tried to set non-existant property"))
+     ((= (ez-get-prop-len size-byte) 1)
+      (ez-mem-set-byte (+ prop-addr 1) value))
+     (t
+      (ez-mem-set-word (+ prop-addr 1) value)))))
 
 ;; Z-strings
 
@@ -354,7 +397,6 @@
 
 (defun ez-read-var-operands-and-inc ()
   (let* ((type-byte (ez-read-pc-byte-and-inc))
-         (bleh (message (binformat type-byte)))
          (types (let ((type1 (lsh type-byte -6)))
                   (if (= type1 #b11)
                       nil
@@ -429,7 +471,11 @@
     ((2op #x16) mul ez-op-mul)
     ((2op #x17) div ez-op-div)
     ((2op #x18) mod ez-op-mod)
-    ((var #x00) call_fv ez-op-callf)))
+    ((var #x00) call_fv ez-op-callf)
+    ((1op #x01) get_sibling ez-op-get-sibling)
+    ((1op #x02) get_child ez-op-get-child)
+    ((1op #x03) get_parent ez-op-get-parent)
+    ((var #x03) put_prop ez-op-put-prop)))
 
 (defun ez-op-ret (operands &optional operand-types)
   (let ((retval (car operands)))
@@ -526,6 +572,27 @@
         (ez-set-local-var (+ i 1) (ez-mem-ref-word (+ r 1 (* 2 i)))))))
   t)
 
+(defun ez-op-get-sibling (operands operand-types)
+  (let ((sib (ez-get-obj-sibling (car operands))))
+    (ez-set-var (ez-read-pc-byte-and-inc) sib)
+    (ez-do-branch (> sib 0))))
+
+(defun ez-op-get-child (operands operand-types)
+  (let ((child (ez-get-obj-child (car operands))))
+    (ez-set-var (ez-read-pc-byte-and-inc) child)
+    (ez-do-branch (> child 0))))
+
+(defun ez-op-get-parent (operands operand-types)
+  (let ((parent (ez-get-obj-parent (car operands))))
+    (ez-set-var (ez-read-pc-byte-and-inc) parent)
+    (ez-do-branch (> parent 0))))
+
+(defun ez-op-put-prop (operands operand-types)
+  (let* ((obj (car operands))
+         (prop (cadr operands))
+         (a (caddr operands)))
+    (ez-set-obj-prop obj prop a)))
+
 ;; Main
 
 (defun ez-run (filename)
@@ -533,39 +600,15 @@
   (ez-parse-header)
   (setq ez-call-stack (list (ez-make-call-stack-frame ez-start-pc)))
 
-  (while (ez-execute-inst)))
+  (while (ez-execute-instr)))
 
 ;; Scratch
 
-(ez-load-file "zork1.z3")
-(ez-parse-header)
-(setq ez-call-stack (list (ez-make-call-stack-frame ez-start-pc)))
-(ez-execute-instr)
-
-(while (ez-execute-instr))
-
-(binformat #x97)
-"10010111"
-(ez-get-obj 208)
-(binformat #x57)
-"01010111"
-
-
-
-ez-call-stack
-((28281 nil [33807 0 180 47872 0 0 0 0 0 0 0 0 ...] nil) (22022 nil [33807 65535 0 0 0 0 0 0 0 0 0 0 ...] nil) (20715 nil [0 0 0 0 0 0 0 0 0 0 0 0 ...] nil))
-
-((22049 nil [33807 0 180 47872 0 0 0 0 0 0 0 0 ...] nil) (22022 nil [33807 65535 0 0 0 0 0 0 0 0 0 0 ...] nil) (20715 nil [0 0 0 0 0 0 0 0 0 0 0 0 ...] nil))
-
-
-
-
-
-
-
-
-
-
+;; (ez-load-file "zork1.z3")
+;; (ez-parse-header)
+;; (setq ez-call-stack (list (ez-make-call-stack-frame ez-start-pc)))
+;; (while (ez-execute-instr))
 
+(ez-run "zork1.z3")
 
 ;;; ez.el ends here