681 lines
20 KiB
Scheme
681 lines
20 KiB
Scheme
; -*- scheme -*-
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; femtoLisp standard library
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; by Jeff Bezanson (C) 2009
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; Distributed under the BSD License
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(set-constant! 'eq eq?)
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(set-constant! 'eqv eqv?)
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(set-constant! 'equal equal?)
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(set-constant! 'rplaca set-car!)
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(set-constant! 'rplacd set-cdr!)
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(set-constant! 'char? (lambda (x) (eq? (typeof x) 'wchar)))
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; convert a sequence of body statements to a single expression.
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; this allows define, defun, defmacro, let, etc. to contain multiple
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; body expressions as in Common Lisp.
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(set! f-body (lambda (e)
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(cond ((atom? e) #f)
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((eq (cdr e) ()) (car e))
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(#t (cons 'begin e)))))
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(set-syntax! 'define-macro
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(lambda (form . body)
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(list 'set-syntax! (list 'quote (car form))
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(list 'lambda (cdr form) (f-body body)))))
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(define-macro (define form . body)
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(if (symbol? form)
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(list 'set! form (car body))
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(list 'set! (car form) (list 'lambda (cdr form) (f-body body)))))
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(define *output-stream* *stdout*)
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(define *input-stream* *stdin*)
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(define (print . args)
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(apply io.print (cons *output-stream* args)))
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(define (princ . args)
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(apply io.princ (cons *output-stream* args)))
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(define (set s v) (eval (list 'set! s (list 'quote v))))
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(define (map f lst)
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(if (atom? lst) lst
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(cons (f (car lst)) (map f (cdr lst)))))
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(define-macro (label name fn)
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(list (list 'lambda (list name) (list 'set! name fn)) #f))
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(define-macro (let binds . body)
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((lambda (lname)
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(begin
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(if (symbol? binds)
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(begin (set! lname binds)
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(set! binds (car body))
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(set! body (cdr body))))
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((lambda (thelambda theargs)
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(cons (if lname
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(list 'label lname thelambda)
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thelambda)
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theargs))
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(list 'lambda
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(map (lambda (c) (if (pair? c) (car c) c)) binds)
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(f-body body))
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(map (lambda (c) (if (pair? c) (cadr c) #f)) binds))))
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#f))
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(define (nconc . lsts)
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(cond ((null? lsts) ())
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((null? (cdr lsts)) (car lsts))
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((null? (car lsts)) (apply nconc (cdr lsts)))
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(#t (prog1 (car lsts)
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(rplacd (last (car lsts))
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(apply nconc (cdr lsts)))))))
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(define (append . lsts)
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(cond ((null? lsts) ())
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((null? (cdr lsts)) (car lsts))
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(#t ((label append2 (lambda (l d)
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(if (null? l) d
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(cons (car l)
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(append2 (cdr l) d)))))
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(car lsts) (apply append (cdr lsts))))))
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(define (member item lst)
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(cond ((atom? lst) #f)
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((equal (car lst) item) lst)
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(#t (member item (cdr lst)))))
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(define (memq item lst)
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(cond ((atom? lst) #f)
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((eq (car lst) item) lst)
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(#t (memq item (cdr lst)))))
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(define (memv item lst)
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(cond ((atom? lst) #f)
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((eqv (car lst) item) lst)
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(#t (memv item (cdr lst)))))
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(define (assoc item lst)
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(cond ((atom? lst) #f)
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((equal (caar lst) item) (car lst))
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(#t (assoc item (cdr lst)))))
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(define (assv item lst)
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(cond ((atom? lst) #f)
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((eqv (caar lst) item) (car lst))
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(#t (assv item (cdr lst)))))
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(define (delete-duplicates lst)
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(if (atom? lst)
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lst
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(let ((elt (car lst))
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(tail (cdr lst)))
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(if (member elt tail)
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(delete-duplicates tail)
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(cons elt
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(delete-duplicates tail))))))
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(define (get-defined-vars- expr)
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(cond ((atom? expr) ())
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((and (eq? (car expr) 'define)
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(pair? (cdr expr)))
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(or (and (symbol? (cadr expr))
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(list (cadr expr)))
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(and (pair? (cadr expr))
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(symbol? (caadr expr))
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(list (caadr expr)))
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()))
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((eq? (car expr) 'begin)
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(apply append (map get-defined-vars- (cdr expr))))
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(else ())))
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(define (get-defined-vars expr)
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(delete-duplicates (get-defined-vars- expr)))
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; redefine f-body to support internal defines
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(define f-body- f-body)
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(define (f-body e)
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((lambda (B)
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((lambda (V)
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(if (null? V)
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B
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(cons (list 'lambda V B) (map (lambda (x) #f) V))))
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(get-defined-vars B)))
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(f-body- e)))
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(define (macrocall? e) (and (symbol? (car e))
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(symbol-syntax (car e))))
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(define (function? x)
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(or (builtin? x)
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(and (pair? x) (eq (car x) 'lambda))))
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(define procedure? function?)
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(define (macroexpand-1 e)
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(if (atom? e) e
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(let ((f (macrocall? e)))
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(if f (apply f (cdr e))
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e))))
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; convert to proper list, i.e. remove "dots", and append
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(define (append.2 l tail)
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(cond ((null? l) tail)
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((atom? l) (cons l tail))
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(#t (cons (car l) (append.2 (cdr l) tail)))))
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(define (cadr x) (car (cdr x)))
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;(set! *special-forms* '(quote cond if and or while lambda trycatch
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; set! begin))
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(define (macroexpand e)
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((label mexpand
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(lambda (e env f)
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(begin
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(while (and (pair? e)
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(not (member (car e) env))
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(set! f (macrocall? e)))
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(set! e (apply f (cdr e))))
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(cond ((and (pair? e)
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(not (eq (car e) 'quote)))
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(let ((newenv
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(if (and (eq (car e) 'lambda)
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(pair? (cdr e)))
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(append.2 (cadr e) env)
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env)))
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(map (lambda (x) (mexpand x newenv ())) e)))
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;((and (symbol? e) (constant? e)) (eval e))
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;((and (symbol? e)
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; (not (member e *special-forms*))
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; (not (member e env))) (cons '%top e))
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(#t e)))))
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e () ()))
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(define-macro (define form . body)
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(if (symbol? form)
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(list 'set! form (car body))
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(list 'set! (car form)
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(macroexpand (list 'lambda (cdr form) (f-body body))))))
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(define-macro (define-macro form . body)
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(list 'set-syntax! (list 'quote (car form))
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(macroexpand (list 'lambda (cdr form) (f-body body)))))
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(define macroexpand (macroexpand macroexpand))
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(define = eqv)
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(define eql eqv)
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(define (/= a b) (not (equal a b)))
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(define != /=)
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(define (> a b) (< b a))
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(define (<= a b) (not (< b a)))
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(define (>= a b) (not (< a b)))
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(define (1+ n) (+ n 1))
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(define (1- n) (- n 1))
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(define (mod x y) (- x (* (/ x y) y)))
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(define remainder mod)
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(define (abs x) (if (< x 0) (- x) x))
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(define (identity x) x)
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(define K prog1) ; K combinator ;)
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(define begin0 prog1)
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(define (caar x) (car (car x)))
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(define (cdar x) (cdr (car x)))
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(define (cddr x) (cdr (cdr x)))
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(define (caaar x) (car (car (car x))))
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(define (caadr x) (car (car (cdr x))))
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(define (cadar x) (car (cdr (car x))))
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(define (caddr x) (car (cdr (cdr x))))
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(define (cadddr x) (car (cdr (cdr (cdr x)))))
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(define (cdaar x) (cdr (car (car x))))
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(define (cdadr x) (cdr (car (cdr x))))
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(define (cddar x) (cdr (cdr (car x))))
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(define (cdddr x) (cdr (cdr (cdr x))))
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(define (every pred lst)
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(or (atom? lst)
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(and (pred (car lst))
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(every pred (cdr lst)))))
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(define (any pred lst)
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(and (pair? lst)
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(or (pred (car lst))
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(any pred (cdr lst)))))
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(define (listp a) (or (null? a) (pair? a)))
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(define (list? a) (or (null? a) (and (pair? a) (list? (cdr a)))))
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(define (nthcdr lst n)
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(if (<= n 0) lst
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(nthcdr (cdr lst) (- n 1))))
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(define list-tail nthcdr)
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(define (list-ref lst n)
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(car (nthcdr lst n)))
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(define (list* . l)
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(if (atom? (cdr l))
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(car l)
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(cons (car l) (apply list* (cdr l)))))
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(define (nlist* . l)
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(if (atom? (cdr l))
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(car l)
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(rplacd l (apply nlist* (cdr l)))))
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(define (lastcdr l)
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(if (atom? l) l
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(lastcdr (cdr l))))
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(define (last l)
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(cond ((atom? l) l)
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((atom? (cdr l)) l)
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(#t (last (cdr l)))))
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(define last-pair last)
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(define (map! f lst)
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(prog1 lst
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(while (pair? lst)
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(rplaca lst (f (car lst)))
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(set! lst (cdr lst)))))
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(define (mapcar f . lsts)
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((label mapcar-
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(lambda (lsts)
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(cond ((null? lsts) (f))
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((atom? (car lsts)) (car lsts))
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(#t (cons (apply f (map car lsts))
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(mapcar- (map cdr lsts)))))))
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lsts))
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(define (transpose M) (apply mapcar (cons list M)))
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(define (filter pred lst) (filter- pred lst ()))
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(define (filter- pred lst accum)
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(cond ((null? lst) accum)
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((pred (car lst))
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(filter- pred (cdr lst) (cons (car lst) accum)))
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(#t
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(filter- pred (cdr lst) accum))))
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(define (separate pred lst) (separate- pred lst () ()))
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(define (separate- pred lst yes no)
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(cond ((null? lst) (cons yes no))
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((pred (car lst))
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(separate- pred (cdr lst) (cons (car lst) yes) no))
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(#t
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(separate- pred (cdr lst) yes (cons (car lst) no)))))
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(define (foldr f zero lst)
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(if (null? lst) zero
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(f (car lst) (foldr f zero (cdr lst)))))
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(define (foldl f zero lst)
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(if (null? lst) zero
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(foldl f (f (car lst) zero) (cdr lst))))
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(define (reverse lst) (foldl cons () lst))
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(define (copy-list l)
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(if (atom? l) l
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(cons (car l)
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(copy-list (cdr l)))))
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(define (copy-tree l)
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(if (atom? l) l
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(cons (copy-tree (car l))
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(copy-tree (cdr l)))))
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(define (nreverse l)
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(let ((prev ()))
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(while (pair? l)
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(set! l (prog1 (cdr l)
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(rplacd l (prog1 prev
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(set! prev l))))))
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prev))
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(define-macro (let* binds . body)
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(cons (list 'lambda (map car binds)
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(f-body
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(nconc (map (lambda (b) (cons 'set! b)) binds)
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body)))
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(map (lambda (x) #f) binds)))
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(set-syntax! 'letrec (symbol-syntax 'let*))
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(define-macro (labels binds . body)
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(cons (list 'lambda (map car binds)
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(f-body
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(nconc (map (lambda (b)
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(list 'set! (car b) (cons 'lambda (cdr b))))
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binds)
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body)))
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(map (lambda (x) #f) binds)))
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(define-macro (when c . body) (list 'if c (f-body body) #f))
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(define-macro (unless c . body) (list 'if c #f (f-body body)))
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(define-macro (dotimes var . body)
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(let ((v (car var))
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(cnt (cadr var)))
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`(for 0 (- ,cnt 1)
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(lambda (,v) ,(f-body body)))))
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(define (map-int f n)
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(if (<= n 0)
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()
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(let ((first (cons (f 0) ()))
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(acc ()))
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(set! acc first)
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(for 1 (- n 1)
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(lambda (i)
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(begin (rplacd acc (cons (f i) ()))
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(set! acc (cdr acc)))))
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first)))
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(define (iota n) (map-int identity n))
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(define ι iota)
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(define (error . args) (raise (cons 'error args)))
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(define-macro (throw tag value) `(raise (list 'thrown-value ,tag ,value)))
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(define-macro (catch tag expr)
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(let ((e (gensym)))
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`(trycatch ,expr
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(lambda (,e) (if (and (pair? ,e)
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(eq (car ,e) 'thrown-value)
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(eq (cadr ,e) ,tag))
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(caddr ,e)
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(raise ,e))))))
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(define-macro (unwind-protect expr finally)
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(let ((e (gensym)))
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`(prog1 (trycatch ,expr
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(lambda (,e) (begin ,finally (raise ,e))))
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,finally)))
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; (try expr
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; (catch (type-error e) . exprs)
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; (catch (io-error e) . exprs)
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; (catch (e) . exprs)
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; (finally . exprs))
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(define-macro (try expr . forms)
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(let* ((e (gensym))
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(reraised (gensym))
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(final (f-body (cdr (or (assq 'finally forms) '(())))))
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(catches (filter (lambda (f) (eq (car f) 'catch)) forms))
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(catchblock `(cond
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,.(map (lambda (catc)
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(let* ((specific (cdr (cadr catc)))
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(extype (caadr catc))
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(var (if specific (car specific)
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extype))
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(todo (cddr catc)))
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`(,(if specific
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; exception matching logic
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`(or (eq ,e ',extype)
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(and (pair? ,e)
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(eq (car ,e)
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',extype)))
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#t); (catch (e) ...), match anything
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(let ((,var ,e)) (begin ,@todo)))))
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catches)
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(#t (raise ,e))))) ; no matches, reraise
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(if final
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(if catches
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; form with both catch and finally
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`(prog1 (trycatch ,expr
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(lambda (,e)
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(trycatch ,catchblock
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(lambda (,reraised)
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(begin ,final
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(raise ,reraised))))))
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,final)
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; finally only; same as unwind-protect
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`(prog1 (trycatch ,expr (lambda (,e)
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(begin ,final (raise ,e))))
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,final))
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; catch, no finally
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`(trycatch ,expr (lambda (,e) ,catchblock)))))
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; setf
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; expands (setf (place x ...) v) to (mutator (f x ...) v)
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; (mutator (identity x ...) v) is interpreted as (mutator x ... v)
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(set! *setf-place-list*
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; place mutator f
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'((car rplaca identity)
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(cdr rplacd identity)
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(caar rplaca car)
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(cadr rplaca cdr)
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(cdar rplacd car)
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(cddr rplacd cdr)
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(caaar rplaca caar)
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(caadr rplaca cadr)
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(cadar rplaca cdar)
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(caddr rplaca cddr)
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(cdaar rplacd caar)
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(cdadr rplacd cadr)
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(cddar rplacd cdar)
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(cdddr rplacd cddr)
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(list-ref rplaca nthcdr)
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(get put! identity)
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(aref aset! identity)
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(symbol-syntax set-syntax! identity)))
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(define (setf-place-mutator place val)
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(if (symbol? place)
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(list 'set! place val)
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(let ((mutator (assq (car place) *setf-place-list*)))
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(if (null? mutator)
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(error "setf: unknown place " (car place))
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(if (eq (caddr mutator) 'identity)
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(cons (cadr mutator) (append (cdr place) (list val)))
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(list (cadr mutator)
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(cons (caddr mutator) (cdr place))
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val))))))
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(define-macro (setf . args)
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(f-body
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((label setf-
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(lambda (args)
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(if (null? args)
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()
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(cons (setf-place-mutator (car args) (cadr args))
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(setf- (cddr args))))))
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args)))
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(define (revappend l1 l2) (nconc (reverse l1) l2))
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(define (nreconc l1 l2) (nconc (nreverse l1) l2))
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(define (list-to-vector l) (apply vector l))
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(define (vector-to-list v)
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(let ((n (length v))
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(l ()))
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(for 1 n
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(lambda (i)
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(set! l (cons (aref v (- n i)) l))))
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l))
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(define (self-evaluating? x)
|
||
(or (and (atom? x)
|
||
(not (symbol? x)))
|
||
(and (constant? x)
|
||
(eq x (eval x)))))
|
||
|
||
; backquote
|
||
(define-macro (backquote x) (bq-process x))
|
||
|
||
(define (splice-form? x)
|
||
(or (and (pair? x) (or (eq (car x) '*comma-at*)
|
||
(eq (car x) '*comma-dot*)))
|
||
(eq x '*comma*)))
|
||
|
||
(define (bq-process x)
|
||
(cond ((self-evaluating? x)
|
||
(if (vector? x)
|
||
(let ((body (bq-process (vector-to-list x))))
|
||
(if (eq (car body) 'list)
|
||
(cons vector (cdr body))
|
||
(list apply vector body)))
|
||
x))
|
||
((atom? x) (list 'quote x))
|
||
((eq (car x) 'backquote) (bq-process (bq-process (cadr x))))
|
||
((eq (car x) '*comma*) (cadr x))
|
||
((not (any splice-form? x))
|
||
(let ((lc (lastcdr x))
|
||
(forms (map bq-bracket1 x)))
|
||
(if (null? lc)
|
||
(cons 'list forms)
|
||
(nconc (cons 'nlist* forms) (list (bq-process lc))))))
|
||
(#t (let ((p x) (q ()))
|
||
(while (and (pair? p)
|
||
(not (eq (car p) '*comma*)))
|
||
(set! q (cons (bq-bracket (car p)) q))
|
||
(set! p (cdr p)))
|
||
(let ((forms
|
||
(cond ((pair? p) (nreconc q (list (cadr p))))
|
||
((null? p) (nreverse q))
|
||
(#t (nreconc q (list (bq-process p)))))))
|
||
(if (null? (cdr forms))
|
||
(car forms)
|
||
(cons 'nconc forms)))))))
|
||
|
||
(define (bq-bracket x)
|
||
(cond ((atom? x) (list list (bq-process x)))
|
||
((eq (car x) '*comma*) (list list (cadr x)))
|
||
((eq (car x) '*comma-at*) (list 'copy-list (cadr x)))
|
||
((eq (car x) '*comma-dot*) (cadr x))
|
||
(#t (list list (bq-process x)))))
|
||
|
||
; bracket without splicing
|
||
(define (bq-bracket1 x)
|
||
(if (and (pair? x) (eq (car x) '*comma*))
|
||
(cadr x)
|
||
(bq-process x)))
|
||
|
||
(define-macro (assert expr) `(if ,expr #t (raise '(assert-failed ,expr))))
|
||
|
||
(define-macro (time expr)
|
||
(let ((t0 (gensym)))
|
||
`(let ((,t0 (time.now)))
|
||
(prog1
|
||
,expr
|
||
(princ "Elapsed time: " (- (time.now) ,t0) " seconds\n")))))
|
||
|
||
(define (display x) (princ x) #t)
|
||
|
||
(define (vu8 . elts) (apply array (cons 'uint8 elts)))
|
||
|
||
(define (vector.map f v)
|
||
(let* ((n (length v))
|
||
(nv (vector.alloc n)))
|
||
(for 0 (- n 1)
|
||
(lambda (i)
|
||
(aset! nv i (f (aref v i)))))
|
||
nv))
|
||
|
||
(define (table.pairs t)
|
||
(table.foldl (lambda (k v z) (cons (cons k v) z))
|
||
() t))
|
||
(define (table.keys t)
|
||
(table.foldl (lambda (k v z) (cons k z))
|
||
() t))
|
||
(define (table.values t)
|
||
(table.foldl (lambda (k v z) (cons v z))
|
||
() t))
|
||
(define (table.clone t)
|
||
(let ((nt (table)))
|
||
(table.foldl (lambda (k v z) (put! nt k v))
|
||
() t)
|
||
nt))
|
||
|
||
(define *whitespace*
|
||
(string.encode #array(wchar 9 10 11 12 13 32 133 160 5760 6158 8192
|
||
8193 8194 8195 8196 8197 8198 8199 8200
|
||
8201 8202 8232 8233 8239 8287 12288)))
|
||
|
||
(define (load filename)
|
||
(let ((F (file filename :read)))
|
||
(trycatch
|
||
(prog1
|
||
(let next (E v)
|
||
(if (not (io.eof? F))
|
||
(next (read F)
|
||
(eval E))
|
||
v))
|
||
(io.close F))
|
||
(lambda (e)
|
||
(begin
|
||
(io.close F)
|
||
(raise `(load-error ,filename ,e)))))))
|
||
|
||
(define *banner*
|
||
"; _
|
||
; |_ _ _ |_ _ | . _ _
|
||
; | (-||||_(_)|__|_)|_)
|
||
;-------------------|----------------------------------------------------------
|
||
|
||
")
|
||
|
||
(define (repl)
|
||
(define (prompt)
|
||
(princ "> ") (io.flush *output-stream*)
|
||
(let ((v (trycatch (read)
|
||
(lambda (e) (begin (io.discardbuffer *input-stream*)
|
||
(raise e))))))
|
||
(and (not (io.eof? *input-stream*))
|
||
(let ((V (eval v)))
|
||
(print V)
|
||
(set! that V)
|
||
#t))))
|
||
(define (reploop)
|
||
(when (trycatch (and (prompt) (princ "\n"))
|
||
print-exception)
|
||
(begin (princ "\n")
|
||
(reploop))))
|
||
(reploop)
|
||
(princ "\n"))
|
||
|
||
(define (print-exception e)
|
||
(cond ((and (pair? e)
|
||
(eq? (car e) 'type-error)
|
||
(= (length e) 4))
|
||
(io.princ *stderr* "type-error: ")
|
||
(io.print *stderr* (cadr e))
|
||
(io.princ *stderr* ": expected ")
|
||
(io.print *stderr* (caddr e))
|
||
(io.princ *stderr* ", got ")
|
||
(io.print *stderr* (cadddr e)))
|
||
|
||
((and (pair? e)
|
||
(eq? (car e) 'unbound-error)
|
||
(pair? (cdr e)))
|
||
(io.princ *stderr*
|
||
"unbound-error: eval: variable " (cadr e)
|
||
" has no value"))
|
||
|
||
((and (pair? e)
|
||
(eq? (car e) 'error))
|
||
(io.princ *stderr* "error: ")
|
||
(apply io.princ (cons *stderr* (cdr e))))
|
||
|
||
((and (pair? e)
|
||
(eq? (car e) 'load-error))
|
||
(print-exception (caddr e))
|
||
(io.princ *stderr* "in file " (cadr e)))
|
||
|
||
((and (list? e)
|
||
(= (length e) 2))
|
||
(io.princ *stderr* (car e) ": " (cadr e)))
|
||
|
||
(else (io.princ *stderr* "*** Unhandled exception: ")
|
||
(io.print *stderr* e)))
|
||
|
||
(io.princ *stderr* "\n")
|
||
#t)
|
||
|
||
(define (__script fname)
|
||
(trycatch (load fname)
|
||
(lambda (e) (begin (print-exception e)
|
||
(exit 1)))))
|
||
|
||
(define (__start . argv)
|
||
(if (pair? (cdr argv))
|
||
(begin (set! *argv* (cdr argv))
|
||
(__script (cadr argv)))
|
||
(begin (set! *argv* argv)
|
||
(princ *banner*)
|
||
(repl)))
|
||
(exit 0))
|