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refactored and symbol lookup
author
Raimon Grau
<raimonster@gmail.com>
Thu, 13 Dec 2012 01:29:44 +0000
(
02:29
+0100)
committer
Raimon Grau
<raimonster@gmail.com>
Thu, 13 Dec 2012 01:29:44 +0000
(
02:29
+0100)
lispstrack.lisp
patch
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diff --git
a/lispstrack.lisp
b/lispstrack.lisp
index
d463be5
..
99a7473
100644
(file)
--- a/
lispstrack.lisp
+++ b/
lispstrack.lisp
@@
-6,10
+6,24
@@
strs
:initial-value ""))
strs
:initial-value ""))
+
+(let ((counter 0))
+ (defun make-binding (symbol)
+ (cons symbol (format nil "V_~d" (incf counter)))))
+
;;; Compiler
(defvar *compilations* nil)
;;; Compiler
(defvar *compilations* nil)
+(defun extend-env (args env)
+ (append (mapcar #'make-binding args) env))
+
+(defun ls-lookup (symbol env)
+ (let ((binding (assoc symbol env)))
+ (if binding
+ (format nil "~a" (cdr binding))
+ (error "Undefined variable `~a'" symbol))))
+
(defmacro define-compilation (name args &body body)
"creates a new primitive `name' with parameters args and @body. The
body can access to the local environment through the variable env"
(defmacro define-compilation (name args &body body)
"creates a new primitive `name' with parameters args and @body. The
body can access to the local environment through the variable env"
@@
-23,28
+37,28
@@
body can access to the local environment through the variable env"
(ls-compile false env)))
(define-compilation lambda (args &rest body)
(ls-compile false env)))
(define-compilation lambda (args &rest body)
- (concat "(function ("
- (format nil "~{V_~a~^, ~}" args)
- "){ "
- (ls-compile-block body (extend-env args env))
- "})
-"))
+ (let ((new-env (extend-env args env)))
+ (concat "(function ("
+ (format nil "~{~a~^, ~}" (mapcar
+ (lambda (x) (ls-lookup x new-env))
+ args))
+ "){ "
+ (ls-compile-block body new-env)
+ "})
+")))
-(defun extend-env (args env)
- (append (mapcar #'list args) env))
+(define-compilation setq (var val)
+ (format nil "~a = ~a" (ls-lookup var env) (ls-compile val env)))
(defparameter *env* '())
(defparameter *env-fun* '())
(defparameter *env* '())
(defparameter *env-fun* '())
-
(defun ls-compile (sexp &optional env)
(cond
(defun ls-compile (sexp &optional env)
(cond
- ((symbolp sexp) (if (assoc sexp env)
- (format nil "V_~a" sexp)
- (error "Undefined variable `~a'" sexp)))
- ((integerp sexp) (format nil " ~a " sexp))
+ ((symbolp sexp) (ls-lookup sexp env))
+ ((integerp sexp) (format nil "~a" sexp))
((stringp sexp) (format nil " \"~a\" " sexp))
((stringp sexp) (format nil " \"~a\" " sexp))
- ; list
+ ; list
((listp sexp)
(let ((compiler-func (second (assoc (car sexp) *compilations*))))
(if compiler-func
((listp sexp)
(let ((compiler-func (second (assoc (car sexp) *compilations*))))
(if compiler-func