scheme.scm

Scheme跨平台编译器

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(define (gen-case code1 code2)
  (lambda (rte) (code2 rte (code1 rte))))

(define (gen-case-clause datums code1 code2)
  (lambda (rte key) (if (memv key datums) (code1 rte) (code2 rte key))))

(define (gen-case-else code)
  (lambda (rte key) (code rte)))

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(define (gen-letrec vals body)
  (let ((nb-vals (length vals)))
    (case nb-vals
      ((1)  (gen-letrec-1 (car vals) body))
      ((2)  (gen-letrec-2 (car vals) (cadr vals) body))
      ((3)  (gen-letrec-3 (car vals) (cadr vals) (caddr vals) body))
      (else (gen-letrec-n nb-vals vals body)))))

(define (gen-letrec-1 val1 body)
  (lambda (rte)
    (let ((x (vector rte #f)))
      (vector-set! x 1 (val1 x))
      (body x))))

(define (gen-letrec-2 val1 val2 body)
  (lambda (rte)
    (let ((x (vector rte #f #f)))
      (vector-set! x 1 (val1 x))
      (vector-set! x 2 (val2 x))
      (body x))))

(define (gen-letrec-3 val1 val2 val3 body)
  (lambda (rte)
    (let ((x (vector rte #f #f #f)))
      (vector-set! x 1 (val1 x))
      (vector-set! x 2 (val2 x))
      (vector-set! x 3 (val3 x))
      (body x))))

(define (gen-letrec-n nb-vals vals body)
  (lambda (rte)
    (let ((x (make-vector (+ nb-vals 1))))
      (vector-set! x 0 rte)
      (let loop ((x x) (i 1) (l vals))
        (if (pair? l)
          (begin (vector-set! x i ((car l) x)) (loop x (+ i 1) (cdr l)))))
      (body x))))

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(define (gen-macro name proc)
  (lambda (rte) (scheme-add-macro name proc)))

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(define (gen-combination oper args)
  (case (length args)
    ((0)  (gen-combination-0 oper))
    ((1)  (gen-combination-1 oper (car args)))
    ((2)  (gen-combination-2 oper (car args) (cadr args)))
    ((3)  (gen-combination-3 oper (car args) (cadr args) (caddr args)))
    (else (gen-combination-n oper args))))

(define (gen-combination-0 oper)
  (lambda (rte) ((oper rte))))

(define (gen-combination-1 oper arg1)
  (lambda (rte) ((oper rte) (arg1 rte))))

(define (gen-combination-2 oper arg1 arg2)
  (lambda (rte) ((oper rte) (arg1 rte) (arg2 rte))))

(define (gen-combination-3 oper arg1 arg2 arg3)
  (lambda (rte) ((oper rte) (arg1 rte) (arg2 rte) (arg3 rte))))

(define (gen-combination-n oper args)
  (lambda (rte)
    (define (evaluate l rte)
      (if (pair? l)
        (cons ((car l) rte) (evaluate (cdr l) rte))
        '()))
    (apply (oper rte) (evaluate args rte))))

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(define (scheme-comp expr env)
  (cond ((symbol? expr)
         (comp-var expr env))
        ((not (pair? expr))
         (comp-self-eval expr env))
        ((macro?2 (car expr) env)
         (scheme-comp (macro-expand expr env) env))
        (else
         (cond
           ((eq? (car expr) 'quote)            (comp-quote expr env))
           ((eq? (car expr) 'quasiquote)       (comp-quasiquote expr env))
           ((eq? (car expr) 'unquote)          (comp-unquote expr env))
           ((eq? (car expr) 'unquote-splicing) (comp-unquote-splicing expr env))
           ((eq? (car expr) 'set!)             (comp-set! expr env))
           ((eq? (car expr) 'lambda)           (comp-lambda expr env))
           ((eq? (car expr) 'if)               (comp-if expr env))
           ((eq? (car expr) 'cond)             (comp-cond expr env))
           ((eq? (car expr) 'and)              (comp-and expr env))
           ((eq? (car expr) 'or)               (comp-or expr env))
           ((eq? (car expr) 'case)             (comp-case expr env))
           ((eq? (car expr) 'let)              (comp-let expr env))
           ((eq? (car expr) 'let*)             (comp-let* expr env))
           ((eq? (car expr) 'letrec)           (comp-letrec expr env))
           ((eq? (car expr) 'begin)            (comp-begin expr env))
           ((eq? (car expr) 'do)               (comp-do expr env))
           ((eq? (car expr) 'define)           (comp-define expr env))
           ((eq? (car expr) 'define-macro)     (comp-define-macro expr env))
           (else                               (comp-combination expr env))))))

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(define (scheme-global-var name)
  (let ((x (assq name scheme-global-variables)))
    (if x
      x
      (let ((y (cons name '())))
        (set! scheme-global-variables (cons y scheme-global-variables))
        y))))

(define (scheme-global-var-ref i)
  (cdr i))

(define (scheme-global-var-set! i val)
  (set-cdr! i val)
  '())

(define scheme-global-variables '())

(define (def-proc name value)
  (scheme-global-var-set!
    (scheme-global-var name)
    value))

(def-proc 'not                            (lambda (x) (not x)))
(def-proc 'boolean?                       boolean?)
(def-proc 'eqv?                           eqv?)
(def-proc 'eq?                            eq?)
(def-proc 'equal?                         equal?)
(def-proc 'pair?                          pair?)
(def-proc 'cons                           cons)
(def-proc 'car                            (lambda (x) (car x)))
(def-proc 'cdr                            (lambda (x) (cdr x)))
(def-proc 'set-car!                       set-car!)
(def-proc 'set-cdr!                       set-cdr!)
(def-proc 'caar                           caar)
(def-proc 'cadr                           cadr)
(def-proc 'cdar                           cdar)
(def-proc 'cddr                           cddr)
(def-proc 'caaar                          caaar)
(def-proc 'caadr                          caadr)
(def-proc 'cadar                          cadar)
(def-proc 'caddr                          caddr)
(def-proc 'cdaar                          cdaar)
(def-proc 'cdadr                          cdadr)
(def-proc 'cddar                          cddar)
(def-proc 'cdddr                          cdddr)
(def-proc 'caaaar                         caaaar)
(def-proc 'caaadr                         caaadr)
(def-proc 'caadar                         caadar)
(def-proc 'caaddr                         caaddr)
(def-proc 'cadaar                         cadaar)
(def-proc 'cadadr                         cadadr)
(def-proc 'caddar                         caddar)
(def-proc 'cadddr                         cadddr)
(def-proc 'cdaaar                         cdaaar)
(def-proc 'cdaadr                         cdaadr)
(def-proc 'cdadar                         cdadar)
(def-proc 'cdaddr                         cdaddr)
(def-proc 'cddaar                         cddaar)
(def-proc 'cddadr                         cddadr)
(def-proc 'cdddar                         cdddar)
(def-proc 'cddddr                         cddddr)
(def-proc 'null?                          (lambda (x) (null? x)))
(def-proc 'list?                          list?)
(def-proc 'list                           list)
(def-proc 'length                         length)
(def-proc 'append                         append)
(def-proc 'reverse                        reverse)
(def-proc 'list-ref                       list-ref)
(def-proc 'memq                           memq)
(def-proc 'memv                           memv)
(def-proc 'member                         member)
(def-proc 'assq                           assq)
(def-proc 'assv                           assv)
(def-proc 'assoc                          assoc)
(def-proc 'symbol?                        symbol?)
(def-proc 'symbol->string                 symbol->string)
(def-proc 'string->symbol                 string->symbol)
(def-proc 'number?                        number?)
(def-proc 'complex?                       complex?)
(def-proc 'real?                          real?)
(def-proc 'rational?                      rational?)
(def-proc 'integer?                       integer?)
(def-proc 'exact?                         exact?)
(def-proc 'inexact?                       inexact?)
;(def-proc '=                              =)
;(def-proc '<                              <)
;(def-proc '>                              >)
;(def-proc '<=                             <=)
;(def-proc '>=                             >=)
;(def-proc 'zero?                          zero?)
;(def-proc 'positive?                      positive?)
;(def-proc 'negative?                      negative?)
;(def-proc 'odd?                           odd?)
;(def-proc 'even?                          even?)
(def-proc 'max                            max)
(def-proc 'min                            min)
;(def-proc '+                              +)
;(def-proc '*                              *)
;(def-proc '-                              -)
(def-proc '/                              /)
(def-proc 'abs                            abs)
;(def-proc 'quotient                       quotient)
;(def-proc 'remainder                      remainder)
;(def-proc 'modulo                         modulo)
(def-proc 'gcd                            gcd)
(def-proc 'lcm                            lcm)
;(def-proc 'numerator                      numerator)
;(def-proc 'denominator                    denominator)
(def-proc 'floor                          floor)
(def-proc 'ceiling                        ceiling)
(def-proc 'truncate                       truncate)
(def-proc 'round                          round)
;(def-proc 'rationalize                    rationalize)
(def-proc 'exp                            exp)
(def-proc 'log                            log)
(def-proc 'sin                            sin)
(def-proc 'cos                            cos)
(def-proc 'tan                            tan)
(def-proc 'asin                           asin)
(def-proc 'acos                           acos)
(def-proc 'atan                           atan)
(def-proc 'sqrt                           sqrt)
(def-proc 'expt                           expt)
;(def-proc 'make-rectangular               make-rectangular)
;(def-proc 'make-polar                     make-polar)
;(def-proc 'real-part                      real-part)
;(def-proc 'imag-part                      imag-part)
;(def-proc 'magnitude                      magnitude)
;(def-proc 'angle                          angle)
(def-proc 'exact->inexact                 exact->inexact)
(def-proc 'inexact->exact                 inexact->exact)
(def-proc 'number->string                 number->string)
(def-proc 'string->number                 string->number)
(def-proc 'char?                          char?)
(def-proc 'char=?                         char=?)
(def-proc 'char<?                         char<?)
(def-proc 'char>?                         char>?)
(def-proc 'char<=?                        char<=?)
(def-proc 'char>=?                        char>=?)
(def-proc 'char-ci=?                      char-ci=?)
(def-proc 'char-ci<?                      char-ci<?)
(def-proc 'char-ci>?                      char-ci>?)
(def-proc 'char-ci<=?                     char-ci<=?)
(def-proc 'char-ci>=?                     char-ci>=?)
(def-proc 'char-alphabetic?               char-alphabetic?)
(def-proc 'char-numeric?                  char-numeric?)
(def-proc 'char-whitespace?               char-whitespace?)
(def-proc 'char-lower-case?               char-lower-case?)
(def-proc 'char->integer                  char->integer)
(def-proc 'integer->char                  integer->char)
(def-proc 'char-upcase                    char-upcase)
(def-proc 'char-downcase                  char-downcase)
(def-proc 'string?                        string?)
(def-proc 'make-string                    make-string)
(def-proc 'string                         string)
(def-proc 'string-length                  string-length)
(def-proc 'string-ref                     string-ref)
(def-proc 'string-set!                    string-set!)
(def-proc 'string=?                       string=?)
(def-proc 'string<?                       string<?)
(def-proc 'string>?                       string>?)
(def-proc 'string<=?                      string<=?)
(def-proc 'string>=?                      string>=?)
(def-proc 'string-ci=?                    string-ci=?)
(def-proc 'string-ci<?                    string-ci<?)
(def-proc 'string-ci>?                    string-ci>?)
(def-proc 'string-ci<=?                   string-ci<=?)
(def-proc 'string-ci>=?                   string-ci>=?)
(def-proc 'substring                      substring)
(def-proc 'string-append                  string-append)
(def-proc 'vector?                        vector?)
(def-proc 'make-vector                    make-vector)
(def-proc 'vector                         vector)
(def-proc 'vector-length                  vector-length)
(def-proc 'vector-ref                     vector-ref)
(def-proc 'vector-set!                    vector-set!)
(def-proc 'procedure?                     procedure?)
(def-proc 'apply                          apply)
(def-proc 'map                            map)
(def-proc 'for-each                       for-each)
(def-proc 'call-with-current-continuation call-with-current-continuation)
(def-proc 'call-with-input-file           call-with-input-file)
(def-proc 'call-with-output-file          call-with-output-file)
(def-proc 'input-port?                    input-port?)
(def-proc 'output-port?                   output-port?)
(def-proc 'current-input-port             current-input-port)
(def-proc 'current-output-port            current-output-port)
(def-proc 'open-input-file                open-input-file)
(def-proc 'open-output-file               open-output-file)
(def-proc 'close-input-port               close-input-port)
(def-proc 'close-output-port              close-output-port)
(def-proc 'eof-object?                    eof-object?)
(def-proc 'read                           read)
(def-proc 'read-char                      read-char)
(def-proc 'peek-char                      peek-char)
(def-proc 'write                          write)
(def-proc 'display                        display)
(def-proc 'newline                        newline)
(def-proc 'write-char                     write-char)

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(define (run)
  (let ((result #f))
    (do ((i 100 (- i 1)))
	((zero? i) result)
      (set! result
	(scheme-eval
	 '(let ()

	    (define (sort-list obj pred)

	      (define (loop l)
		(if (and (pair? l) (pair? (cdr l)))
		    (split l '() '())
		    l))

	      (define (split l one two)
		(if (pair? l)
		    (split (cdr l) two (cons (car l) one))
		    (merge (loop one) (loop two))))

	      (define (merge one two)
		(cond ((null? one) two)
		      ((pred (car two) (car one))
		       (cons (car two)
			     (merge (cdr two) one)))
		      (else
		       (cons (car one)
			     (merge (cdr one) two)))))

	      (loop obj))

	    (sort-list '("one" "two" "three" "four" "five" "six"
			 "seven" "eight" "nine" "ten" "eleven" "twelve")
		       string<?)))))))

(let ((r (time (run))))
  (if (not (equal? r '("eight" "eleven" "five" "four" "nine" "one" "seven" "six" "ten" "three" "twelve" "two")))
      (error "wrong result" r) ) )