882 lines
40 KiB
C
882 lines
40 KiB
C
#if 0
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=pod
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/*
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=cut
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use strict;
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my $src = <<'EOL';
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(define-macro call-with-current-environment
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(lambda (form env)
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(list (cadr form) env)))
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(define here
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(call-with-current-environment
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(lambda (env)
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env)))
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(define (the var) ; synonym for #'var
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(make-identifier var here))
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(define the-define (the 'define))
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(define the-lambda (the 'lambda))
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(define the-begin (the 'begin))
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(define the-quote (the 'quote))
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(define the-set! (the 'set!))
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(define the-if (the 'if))
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(define the-define-macro (the 'define-macro))
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(define-macro syntax-error
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(lambda (form _)
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(apply error (cdr form))))
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(define-macro define-auxiliary-syntax
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(lambda (form _)
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(define message
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(string-append
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"invalid use of auxiliary syntax: '" (symbol->string (cadr form)) "'"))
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(list
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the-define-macro
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(cadr form)
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(list the-lambda '_
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(list (the 'error) message)))))
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(define-auxiliary-syntax else)
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(define-auxiliary-syntax =>)
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(define-auxiliary-syntax unquote)
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(define-auxiliary-syntax unquote-splicing)
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(define-auxiliary-syntax syntax-unquote)
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(define-auxiliary-syntax syntax-unquote-splicing)
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(define-macro let
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(lambda (form env)
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(if (variable? (cadr form))
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(list
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(list the-lambda '()
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(list the-define (cadr form)
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(cons the-lambda
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(cons (map car (car (cddr form)))
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(cdr (cddr form)))))
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(cons (cadr form) (map cadr (car (cddr form))))))
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(cons
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(cons
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the-lambda
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(cons (map car (cadr form))
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(cddr form)))
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(map cadr (cadr form))))))
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(define-macro and
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(lambda (form env)
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(if (null? (cdr form))
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#t
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(if (null? (cddr form))
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(cadr form)
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(list the-if
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(cadr form)
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(cons (the 'and) (cddr form))
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#f)))))
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(define-macro or
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(lambda (form env)
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(if (null? (cdr form))
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#f
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(let ((tmp (make-identifier 'it env)))
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(list (the 'let)
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(list (list tmp (cadr form)))
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(list the-if
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tmp
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tmp
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(cons (the 'or) (cddr form))))))))
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(define-macro cond
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(lambda (form env)
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(let ((clauses (cdr form)))
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(if (null? clauses)
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#undefined
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(let ((clause (car clauses)))
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(if (and (variable? (car clause))
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(variable=? (the 'else) (make-identifier (car clause) env)))
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(cons the-begin (cdr clause))
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(if (and (variable? (cadr clause))
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(variable=? (the '=>) (make-identifier (cadr clause) env)))
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(let ((tmp (make-identifier 'tmp here)))
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(list (the 'let) (list (list tmp (car clause)))
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(list the-if tmp
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(list (car (cddr clause)) tmp)
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(cons (the 'cond) (cdr clauses)))))
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(list the-if (car clause)
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(cons the-begin (cdr clause))
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(cons (the 'cond) (cdr clauses))))))))))
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(define-macro quasiquote
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(lambda (form env)
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(define (quasiquote? form)
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(and (pair? form)
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(variable? (car form))
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(variable=? (the 'quasiquote) (make-identifier (car form) env))))
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(define (unquote? form)
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(and (pair? form)
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(variable? (car form))
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(variable=? (the 'unquote) (make-identifier (car form) env))))
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(define (unquote-splicing? form)
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(and (pair? form)
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(pair? (car form))
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(variable? (caar form))
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(variable=? (the 'unquote-splicing) (make-identifier (caar form) env))))
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(define (qq depth expr)
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(cond
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;; unquote
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((unquote? expr)
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(if (= depth 1)
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(car (cdr expr))
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(list (the 'list)
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(list (the 'quote) (the 'unquote))
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(qq (- depth 1) (car (cdr expr))))))
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;; unquote-splicing
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((unquote-splicing? expr)
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(if (= depth 1)
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(list (the 'append)
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(car (cdr (car expr)))
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(qq depth (cdr expr)))
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(list (the 'cons)
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(list (the 'list)
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(list (the 'quote) (the 'unquote-splicing))
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(qq (- depth 1) (car (cdr (car expr)))))
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(qq depth (cdr expr)))))
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;; quasiquote
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((quasiquote? expr)
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(list (the 'list)
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(list (the 'quote) (the 'quasiquote))
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(qq (+ depth 1) (car (cdr expr)))))
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;; list
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((pair? expr)
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(list (the 'cons)
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(qq depth (car expr))
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(qq depth (cdr expr))))
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;; vector
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((vector? expr)
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(list (the 'list->vector) (qq depth (vector->list expr))))
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;; simple datum
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(else
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(list (the 'quote) expr))))
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(let ((x (cadr form)))
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(qq 1 x))))
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(define-macro let*
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(lambda (form env)
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(let ((bindings (car (cdr form)))
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(body (cdr (cdr form))))
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(if (null? bindings)
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`(,(the 'let) () ,@body)
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`(,(the 'let) ((,(car (car bindings)) ,@(cdr (car bindings))))
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(,(the 'let*) (,@(cdr bindings))
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,@body))))))
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(define-macro letrec
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(lambda (form env)
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`(,(the 'letrec*) ,@(cdr form))))
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(define-macro letrec*
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(lambda (form env)
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(let ((bindings (car (cdr form)))
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(body (cdr (cdr form))))
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(let ((variables (map (lambda (v) `(,v #f)) (map car bindings)))
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(initials (map (lambda (v) `(,(the 'set!) ,@v)) bindings)))
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`(,(the 'let) (,@variables)
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,@initials
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,@body)))))
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(define-macro let-values
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(lambda (form env)
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`(,(the 'let*-values) ,@(cdr form))))
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(define-macro let*-values
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(lambda (form env)
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(let ((formal (car (cdr form)))
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(body (cdr (cdr form))))
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(if (null? formal)
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`(,(the 'let) () ,@body)
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`(,(the 'call-with-values) (,the-lambda () ,@(cdr (car formal)))
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(,(the 'lambda) (,@(car (car formal)))
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(,(the 'let*-values) (,@(cdr formal))
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,@body)))))))
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(define-macro define-values
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(lambda (form env)
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(let ((formal (car (cdr form)))
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(body (cdr (cdr form))))
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(let ((arguments (make-identifier 'arguments here)))
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`(,the-begin
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,@(let loop ((formal formal))
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(if (pair? formal)
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`((,the-define ,(car formal) #undefined) ,@(loop (cdr formal)))
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(if (variable? formal)
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`((,the-define ,formal #undefined))
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'())))
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(,(the 'call-with-values) (,the-lambda () ,@body)
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(,the-lambda
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,arguments
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,@(let loop ((formal formal) (args arguments))
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(if (pair? formal)
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`((,the-set! ,(car formal) (,(the 'car) ,args)) ,@(loop (cdr formal) `(,(the 'cdr) ,args)))
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(if (variable? formal)
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`((,the-set! ,formal ,args))
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'()))))))))))
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(define-macro do
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(lambda (form env)
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(let ((bindings (car (cdr form)))
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(test (car (car (cdr (cdr form)))))
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(cleanup (cdr (car (cdr (cdr form)))))
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(body (cdr (cdr (cdr form)))))
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(let ((loop (make-identifier 'loop here)))
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`(,(the 'let) ,loop ,(map (lambda (x) `(,(car x) ,(cadr x))) bindings)
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(,the-if ,test
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(,the-begin
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,@cleanup)
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(,the-begin
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,@body
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(,loop ,@(map (lambda (x) (if (null? (cdr (cdr x))) (car x) (car (cdr (cdr x))))) bindings)))))))))
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(define-macro when
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(lambda (form env)
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(let ((test (car (cdr form)))
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(body (cdr (cdr form))))
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`(,the-if ,test
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(,the-begin ,@body)
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#undefined))))
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(define-macro unless
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(lambda (form env)
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(let ((test (car (cdr form)))
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(body (cdr (cdr form))))
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`(,the-if ,test
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#undefined
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(,the-begin ,@body)))))
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(define-macro case
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(lambda (form env)
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(let ((key (car (cdr form)))
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(clauses (cdr (cdr form))))
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(let ((the-key (make-identifier 'key here)))
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`(,(the 'let) ((,the-key ,key))
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,(let loop ((clauses clauses))
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(if (null? clauses)
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#undefined
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(let ((clause (car clauses)))
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`(,the-if ,(if (and (variable? (car clause))
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(variable=? (the 'else) (make-identifier (car clause) env)))
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#t
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`(,(the 'or) ,@(map (lambda (x) `(,(the 'eqv?) ,the-key (,the-quote ,x))) (car clause))))
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,(if (and (variable? (cadr clause))
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(variable=? (the '=>) (make-identifier (cadr clause) env)))
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`(,(car (cdr (cdr clause))) ,the-key)
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`(,the-begin ,@(cdr clause)))
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,(loop (cdr clauses)))))))))))
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(define-macro parameterize
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(lambda (form env)
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(let ((formal (car (cdr form)))
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(body (cdr (cdr form))))
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`(,(the 'with-parameter)
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(,(the 'lambda) ()
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,@formal
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,@body)))))
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(define-macro syntax-quote
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(lambda (form env)
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(let ((renames '()))
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(letrec
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((rename (lambda (var)
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(let ((x (assq var renames)))
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(if x
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(cadr x)
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(begin
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(set! renames `((,var ,(make-identifier var env) (,(the 'make-identifier) ',var ',env)) . ,renames))
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(rename var))))))
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(walk (lambda (f form)
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(cond
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((variable? form)
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(f form))
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((pair? form)
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`(,(the 'cons) (walk f (car form)) (walk f (cdr form))))
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((vector? form)
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`(,(the 'list->vector) (walk f (vector->list form))))
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(else
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`(,(the 'quote) ,form))))))
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(let ((form (walk rename (cadr form))))
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`(,(the 'let)
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,(map cdr renames)
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,form))))))
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(define-macro syntax-quasiquote
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(lambda (form env)
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(let ((renames '()))
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(letrec
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((rename (lambda (var)
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(let ((x (assq var renames)))
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(if x
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(cadr x)
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(begin
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(set! renames `((,var ,(make-identifier var env) (,(the 'make-identifier) ',var ',env)) . ,renames))
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(rename var)))))))
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(define (syntax-quasiquote? form)
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(and (pair? form)
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(variable? (car form))
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(variable=? (the 'syntax-quasiquote) (make-identifier (car form) env))))
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(define (syntax-unquote? form)
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(and (pair? form)
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(variable? (car form))
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(variable=? (the 'syntax-unquote) (make-identifier (car form) env))))
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(define (syntax-unquote-splicing? form)
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(and (pair? form)
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(pair? (car form))
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(variable? (caar form))
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(variable=? (the 'syntax-unquote-splicing) (make-identifier (caar form) env))))
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(define (qq depth expr)
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(cond
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;; syntax-unquote
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((syntax-unquote? expr)
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(if (= depth 1)
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(car (cdr expr))
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(list (the 'list)
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(list (the 'quote) (the 'syntax-unquote))
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(qq (- depth 1) (car (cdr expr))))))
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;; syntax-unquote-splicing
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((syntax-unquote-splicing? expr)
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(if (= depth 1)
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(list (the 'append)
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(car (cdr (car expr)))
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(qq depth (cdr expr)))
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(list (the 'cons)
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(list (the 'list)
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(list (the 'quote) (the 'syntax-unquote-splicing))
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(qq (- depth 1) (car (cdr (car expr)))))
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(qq depth (cdr expr)))))
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;; syntax-quasiquote
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((syntax-quasiquote? expr)
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(list (the 'list)
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(list (the 'quote) (the 'quasiquote))
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(qq (+ depth 1) (car (cdr expr)))))
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;; list
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((pair? expr)
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(list (the 'cons)
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(qq depth (car expr))
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(qq depth (cdr expr))))
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;; vector
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((vector? expr)
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(list (the 'list->vector) (qq depth (vector->list expr))))
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;; variable
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((variable? expr)
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(rename expr))
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;; simple datum
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(else
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(list (the 'quote) expr))))
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(let ((body (qq 1 (cadr form))))
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`(,(the 'let)
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,(map cdr renames)
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,body))))))
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(define (transformer f)
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(lambda (form env)
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(let ((register1 (make-register))
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(register2 (make-register)))
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(letrec
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((wrap (lambda (var1)
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(let ((var2 (register1 var1)))
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(if (undefined? var2)
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(let ((var2 (make-identifier var1 env)))
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(register1 var1 var2)
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(register2 var2 var1)
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var2)
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var2))))
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(unwrap (lambda (var2)
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(let ((var1 (register2 var2)))
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(if (undefined? var1)
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var2
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var1))))
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(walk (lambda (f form)
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(cond
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((variable? form)
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(f form))
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((pair? form)
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(cons (walk f (car form)) (walk f (cdr form))))
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((vector? form)
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(list->vector (walk f (vector->list form))))
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(else
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form)))))
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(let ((form (cdr form)))
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(walk unwrap (apply f (walk wrap form))))))))
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(define-macro define-syntax
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(lambda (form env)
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(let ((formal (car (cdr form)))
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(body (cdr (cdr form))))
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(if (pair? formal)
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`(,(the 'define-syntax) ,(car formal) (,the-lambda ,(cdr formal) ,@body))
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`(,the-define-macro ,formal (,(the 'transformer) (,the-begin ,@body)))))))
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(define-macro letrec-syntax
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(lambda (form env)
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(let ((formal (car (cdr form)))
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(body (cdr (cdr form))))
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`(let ()
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,@(map (lambda (x)
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`(,(the 'define-syntax) ,(car x) ,(cadr x)))
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formal)
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,@body))))
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(define-macro let-syntax
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(lambda (form env)
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`(,(the 'letrec-syntax) ,@(cdr form))))
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;;; library primitives
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(define-macro define-library
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(lambda (form _)
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(let ((name (cadr form))
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(body (cddr form)))
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(let ((old-library (current-library))
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(new-library (or (find-library name) (make-library name))))
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(let ((env (library-environment new-library)))
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(current-library new-library)
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(for-each (lambda (expr) (eval expr env)) body)
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(current-library old-library))))))
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(define-macro cond-expand
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(lambda (form _)
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(letrec
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((test (lambda (form)
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(or
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(eq? form 'else)
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(and (symbol? form)
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(memq form (features)))
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(and (pair? form)
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(case (car form)
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((library) (find-library (cadr form)))
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((not) (not (test (cadr form))))
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((and) (let loop ((form (cdr form)))
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(or (null? form)
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(and (test (car form)) (loop (cdr form))))))
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((or) (let loop ((form (cdr form)))
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(and (pair? form)
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(or (test (car form)) (loop (cdr form))))))
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(else #f)))))))
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(let loop ((clauses (cdr form)))
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(if (null? clauses)
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#undefined
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(if (test (caar clauses))
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`(,the-begin ,@(cdar clauses))
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(loop (cdr clauses))))))))
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(define-macro import
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(lambda (form _)
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(let ((caddr
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(lambda (x) (car (cdr (cdr x)))))
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(prefix
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(lambda (prefix symbol)
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(string->symbol
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(string-append
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(symbol->string prefix)
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(symbol->string symbol))))))
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(letrec
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((extract
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(lambda (spec)
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(case (car spec)
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((only rename prefix except)
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(extract (cadr spec)))
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(else
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(or (find-library spec) (error "library not found" spec))))))
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(collect
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(lambda (spec)
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(case (car spec)
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((only)
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(let ((alist (collect (cadr spec))))
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(map (lambda (var) (assq var alist)) (cddr spec))))
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((rename)
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(let ((alist (collect (cadr spec))))
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(map (lambda (s) (or (assq (car s) (cddr spec)) s)) alist)))
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((prefix)
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(let ((alist (collect (cadr spec))))
|
|
(map (lambda (s) (cons (prefix (caddr spec) (car s)) (cdr s))) alist)))
|
|
((except)
|
|
(let ((alist (collect (cadr spec))))
|
|
(let loop ((alist alist))
|
|
(if (null? alist)
|
|
'()
|
|
(if (memq (caar alist) (cddr spec))
|
|
(loop (cdr alist))
|
|
(cons (car alist) (loop (cdr alist))))))))
|
|
(else
|
|
(let ((lib (or (find-library spec) (error "library not found" spec))))
|
|
(map (lambda (x) (cons x x)) (library-exports lib))))))))
|
|
(letrec
|
|
((import
|
|
(lambda (spec)
|
|
(let ((lib (extract spec))
|
|
(alist (collect spec)))
|
|
(for-each
|
|
(lambda (slot)
|
|
(library-import lib (cdr slot) (car slot)))
|
|
alist)))))
|
|
(for-each import (cdr form)))))))
|
|
|
|
(define-macro export
|
|
(lambda (form _)
|
|
(letrec
|
|
((collect
|
|
(lambda (spec)
|
|
(cond
|
|
((symbol? spec)
|
|
`(,spec . ,spec))
|
|
((and (list? spec) (= (length spec) 3) (eq? (car spec) 'rename))
|
|
`(,(list-ref spec 1) . ,(list-ref spec 2)))
|
|
(else
|
|
(error "malformed export")))))
|
|
(export
|
|
(lambda (spec)
|
|
(let ((slot (collect spec)))
|
|
(library-export (car slot) (cdr slot))))))
|
|
(for-each export (cdr form)))))
|
|
|
|
(export define-library
|
|
cond-expand
|
|
import
|
|
export)
|
|
|
|
(export let let* letrec letrec*
|
|
let-values let*-values define-values
|
|
quasiquote unquote unquote-splicing
|
|
and or
|
|
cond case else =>
|
|
do when unless
|
|
parameterize
|
|
define-syntax
|
|
syntax-quote syntax-unquote
|
|
syntax-quasiquote syntax-unquote-splicing
|
|
let-syntax letrec-syntax
|
|
syntax-error)
|
|
|
|
|
|
EOL
|
|
|
|
open IN, "./boot.c";
|
|
my @data = <IN>;
|
|
close IN;
|
|
|
|
open STDOUT, ">", "./boot.c";
|
|
|
|
foreach (@data) {
|
|
print;
|
|
last if $_ eq "#---END---\n";
|
|
}
|
|
|
|
print "\n#endif\n\n";
|
|
|
|
print <<EOL;
|
|
const char pic_boot[][80] = {
|
|
EOL
|
|
|
|
my @lines = $src =~ /.{0,80}/gs;
|
|
|
|
foreach (@lines) {
|
|
s/\\/\\\\/g;
|
|
s/"/\\"/g;
|
|
s/\n/\\n/g;
|
|
print "\"$_\",\n";
|
|
}
|
|
print "\"\"\n";
|
|
|
|
=pod
|
|
*/
|
|
=cut
|
|
|
|
print <<EOL;
|
|
};
|
|
|
|
#if 0
|
|
Local Variables:
|
|
mode: scheme
|
|
End:
|
|
|
|
=cut
|
|
#endif
|
|
EOL
|
|
|
|
=pod
|
|
|
|
#---END---
|
|
|
|
#endif
|
|
|
|
const char pic_boot[][80] = {
|
|
"\n(define-macro call-with-current-environment\n (lambda (form env)\n (list (cad",
|
|
"r form) env)))\n\n(define here\n (call-with-current-environment\n (lambda (env)\n ",
|
|
" env)))\n\n(define (the var) ; synonym for #'var\n (make-id",
|
|
"entifier var here))\n\n(define the-define (the 'define))\n(define the-lambda (the '",
|
|
"lambda))\n(define the-begin (the 'begin))\n(define the-quote (the 'quote))\n(define",
|
|
" the-set! (the 'set!))\n(define the-if (the 'if))\n(define the-define-macro (the '",
|
|
"define-macro))\n\n(define-macro syntax-error\n (lambda (form _)\n (apply error (",
|
|
"cdr form))))\n\n(define-macro define-auxiliary-syntax\n (lambda (form _)\n (defi",
|
|
"ne message\n (string-append\n \"invalid use of auxiliary syntax: '\" (sym",
|
|
"bol->string (cadr form)) \"'\"))\n (list\n the-define-macro\n (cadr form)\n",
|
|
" (list the-lambda '_\n (list (the 'error) message)))))\n\n(define-aux",
|
|
"iliary-syntax else)\n(define-auxiliary-syntax =>)\n(define-auxiliary-syntax unquot",
|
|
"e)\n(define-auxiliary-syntax unquote-splicing)\n(define-auxiliary-syntax syntax-un",
|
|
"quote)\n(define-auxiliary-syntax syntax-unquote-splicing)\n\n(define-macro let\n (l",
|
|
"ambda (form env)\n (if (variable? (cadr form))\n (list\n (list th",
|
|
"e-lambda '()\n (list the-define (cadr form)\n (c",
|
|
"ons the-lambda\n (cons (map car (car (cddr form)))\n ",
|
|
" (cdr (cddr form)))))\n (cons (cadr for",
|
|
"m) (map cadr (car (cddr form))))))\n (cons\n (cons\n the-la",
|
|
"mbda\n (cons (map car (cadr form))\n (cddr form)))\n ",
|
|
" (map cadr (cadr form))))))\n\n(define-macro and\n (lambda (form env)\n (if (nu",
|
|
"ll? (cdr form))\n #t\n (if (null? (cddr form))\n (cadr for",
|
|
"m)\n (list the-if\n (cadr form)\n (con",
|
|
"s (the 'and) (cddr form))\n #f)))))\n\n(define-macro or\n (lambda ",
|
|
"(form env)\n (if (null? (cdr form))\n #f\n (let ((tmp (make-identi",
|
|
"fier 'it env)))\n (list (the 'let)\n (list (list tmp (cadr",
|
|
" form)))\n (list the-if\n tmp\n ",
|
|
" tmp\n (cons (the 'or) (cddr form))))))))\n\n(define-macr",
|
|
"o cond\n (lambda (form env)\n (let ((clauses (cdr form)))\n (if (null? cla",
|
|
"uses)\n #undefined\n (let ((clause (car clauses)))\n (",
|
|
"if (and (variable? (car clause))\n (variable=? (the 'else) (m",
|
|
"ake-identifier (car clause) env)))\n (cons the-begin (cdr clause))",
|
|
"\n (if (and (variable? (cadr clause))\n (va",
|
|
"riable=? (the '=>) (make-identifier (cadr clause) env)))\n (le",
|
|
"t ((tmp (make-identifier 'tmp here)))\n (list (the 'let) (li",
|
|
"st (list tmp (car clause)))\n (list the-if tmp\n ",
|
|
" (list (car (cddr clause)) tmp)\n ",
|
|
" (cons (the 'cond) (cdr clauses)))))\n (list the-if",
|
|
" (car clause)\n (cons the-begin (cdr clause))\n ",
|
|
" (cons (the 'cond) (cdr clauses))))))))))\n\n(define-macro quasiquo",
|
|
"te\n (lambda (form env)\n\n (define (quasiquote? form)\n (and (pair? form)\n",
|
|
" (variable? (car form))\n (variable=? (the 'quasiquote) (make",
|
|
"-identifier (car form) env))))\n\n (define (unquote? form)\n (and (pair? fo",
|
|
"rm)\n (variable? (car form))\n (variable=? (the 'unquote) (mak",
|
|
"e-identifier (car form) env))))\n\n (define (unquote-splicing? form)\n (and",
|
|
" (pair? form)\n (pair? (car form))\n (variable? (caar form))\n ",
|
|
" (variable=? (the 'unquote-splicing) (make-identifier (caar form) env))",
|
|
"))\n\n (define (qq depth expr)\n (cond\n ;; unquote\n ((unquote? ",
|
|
"expr)\n (if (= depth 1)\n (car (cdr expr))\n (list (th",
|
|
"e 'list)\n (list (the 'quote) (the 'unquote))\n ",
|
|
"(qq (- depth 1) (car (cdr expr))))))\n ;; unquote-splicing\n ((unquote",
|
|
"-splicing? expr)\n (if (= depth 1)\n (list (the 'append)\n ",
|
|
" (car (cdr (car expr)))\n (qq depth (cdr expr)))\n ",
|
|
" (list (the 'cons)\n (list (the 'list)\n ",
|
|
" (list (the 'quote) (the 'unquote-splicing))\n (qq (- ",
|
|
"depth 1) (car (cdr (car expr)))))\n (qq depth (cdr expr)))))\n ",
|
|
" ;; quasiquote\n ((quasiquote? expr)\n (list (the 'list)\n ",
|
|
" (list (the 'quote) (the 'quasiquote))\n (qq (+ depth 1) (car (c",
|
|
"dr expr)))))\n ;; list\n ((pair? expr)\n (list (the 'cons)\n ",
|
|
" (qq depth (car expr))\n (qq depth (cdr expr))))\n ;; v",
|
|
"ector\n ((vector? expr)\n (list (the 'list->vector) (qq depth (vector",
|
|
"->list expr))))\n ;; simple datum\n (else\n (list (the 'quote) e",
|
|
"xpr))))\n\n (let ((x (cadr form)))\n (qq 1 x))))\n\n(define-macro let*\n (lam",
|
|
"bda (form env)\n (let ((bindings (car (cdr form)))\n (body (cdr (c",
|
|
"dr form))))\n (if (null? bindings)\n `(,(the 'let) () ,@body)\n ",
|
|
" `(,(the 'let) ((,(car (car bindings)) ,@(cdr (car bindings))))\n (",
|
|
",(the 'let*) (,@(cdr bindings))\n ,@body))))))\n\n(define-macro letrec\n",
|
|
" (lambda (form env)\n `(,(the 'letrec*) ,@(cdr form))))\n\n(define-macro letrec",
|
|
"*\n (lambda (form env)\n (let ((bindings (car (cdr form)))\n (body ",
|
|
" (cdr (cdr form))))\n (let ((variables (map (lambda (v) `(,v #f)) (map car b",
|
|
"indings)))\n (initials (map (lambda (v) `(,(the 'set!) ,@v)) bindings",
|
|
")))\n `(,(the 'let) (,@variables)\n ,@initials\n ,@body)))",
|
|
"))\n\n(define-macro let-values\n (lambda (form env)\n `(,(the 'let*-values) ,@(c",
|
|
"dr form))))\n\n(define-macro let*-values\n (lambda (form env)\n (let ((formal (c",
|
|
"ar (cdr form)))\n (body (cdr (cdr form))))\n (if (null? formal)\n ",
|
|
" `(,(the 'let) () ,@body)\n `(,(the 'call-with-values) (,the-lamb",
|
|
"da () ,@(cdr (car formal)))\n (,(the 'lambda) (,@(car (car formal)))\n ",
|
|
" (,(the 'let*-values) (,@(cdr formal))\n ,@body)))))))\n\n(",
|
|
"define-macro define-values\n (lambda (form env)\n (let ((formal (car (cdr form",
|
|
")))\n (body (cdr (cdr form))))\n (let ((arguments (make-identifier",
|
|
" 'arguments here)))\n `(,the-begin\n ,@(let loop ((formal formal))",
|
|
"\n (if (pair? formal)\n `((,the-define ,(car formal)",
|
|
" #undefined) ,@(loop (cdr formal)))\n (if (variable? formal)\n ",
|
|
" `((,the-define ,formal #undefined))\n '()",
|
|
")))\n (,(the 'call-with-values) (,the-lambda () ,@body)\n (,the",
|
|
"-lambda\n ,arguments\n ,@(let loop ((formal formal) (args ar",
|
|
"guments))\n (if (pair? formal)\n `((,the-set! ,(",
|
|
"car formal) (,(the 'car) ,args)) ,@(loop (cdr formal) `(,(the 'cdr) ,args)))\n ",
|
|
" (if (variable? formal)\n `((,the-set! ,fo",
|
|
"rmal ,args))\n '()))))))))))\n\n(define-macro do\n (lambda (",
|
|
"form env)\n (let ((bindings (car (cdr form)))\n (test (car (car (c",
|
|
"dr (cdr form)))))\n (cleanup (cdr (car (cdr (cdr form)))))\n (b",
|
|
"ody (cdr (cdr (cdr form)))))\n (let ((loop (make-identifier 'loop here))",
|
|
")\n `(,(the 'let) ,loop ,(map (lambda (x) `(,(car x) ,(cadr x))) bindings)",
|
|
"\n (,the-if ,test\n (,the-begin\n ,@c",
|
|
"leanup)\n (,the-begin\n ,@body\n ",
|
|
" (,loop ,@(map (lambda (x) (if (null? (cdr (cdr x))) (car x) (car (cdr (cdr",
|
|
" x))))) bindings)))))))))\n\n(define-macro when\n (lambda (form env)\n (let ((te",
|
|
"st (car (cdr form)))\n (body (cdr (cdr form))))\n `(,the-if ,test\n ",
|
|
" (,the-begin ,@body)\n #undefined))))\n\n(define-macro ",
|
|
"unless\n (lambda (form env)\n (let ((test (car (cdr form)))\n (body (c",
|
|
"dr (cdr form))))\n `(,the-if ,test\n #undefined\n ",
|
|
" (,the-begin ,@body)))))\n\n(define-macro case\n (lambda (form env)\n (let ((ke",
|
|
"y (car (cdr form)))\n (clauses (cdr (cdr form))))\n (let ((the-k",
|
|
"ey (make-identifier 'key here)))\n `(,(the 'let) ((,the-key ,key))\n ",
|
|
" ,(let loop ((clauses clauses))\n (if (null? clauses)\n ",
|
|
" #undefined\n (let ((clause (car clauses)))\n ",
|
|
" `(,the-if ,(if (and (variable? (car clause))\n ",
|
|
" (variable=? (the 'else) (make-identifier (car clause) env)))\n ",
|
|
" #t\n `(,(the 'or) ,@(map (la",
|
|
"mbda (x) `(,(the 'eqv?) ,the-key (,the-quote ,x))) (car clause))))\n ",
|
|
" ,(if (and (variable? (cadr clause))\n ",
|
|
" (variable=? (the '=>) (make-identifier (cadr clause) env)))\n ",
|
|
" `(,(car (cdr (cdr clause))) ,the-key)\n ",
|
|
" `(,the-begin ,@(cdr clause)))\n ,(lo",
|
|
"op (cdr clauses)))))))))))\n\n(define-macro parameterize\n (lambda (form env)\n ",
|
|
"(let ((formal (car (cdr form)))\n (body (cdr (cdr form))))\n `(,(t",
|
|
"he 'with-parameter)\n (,(the 'lambda) ()\n ,@formal\n ,@body",
|
|
")))))\n\n(define-macro syntax-quote\n (lambda (form env)\n (let ((renames '()))\n",
|
|
" (letrec\n ((rename (lambda (var)\n (let ((x (as",
|
|
"sq var renames)))\n (if x\n (cadr ",
|
|
"x)\n (begin\n (set! renames ",
|
|
"`((,var ,(make-identifier var env) (,(the 'make-identifier) ',var ',env)) . ,ren",
|
|
"ames))\n (rename var))))))\n (walk (lambda (",
|
|
"f form)\n (cond\n ((variable? form)\n ",
|
|
" (f form))\n ((pair? form)\n `(,",
|
|
"(the 'cons) (walk f (car form)) (walk f (cdr form))))\n ((vect",
|
|
"or? form)\n `(,(the 'list->vector) (walk f (vector->list form",
|
|
"))))\n (else\n `(,(the 'quote) ,form))))))\n",
|
|
" (let ((form (walk rename (cadr form))))\n `(,(the 'let)\n ",
|
|
" ,(map cdr renames)\n ,form))))))\n\n(define-macro syntax-quasiquote\n",
|
|
" (lambda (form env)\n (let ((renames '()))\n (letrec\n ((rename (",
|
|
"lambda (var)\n (let ((x (assq var renames)))\n ",
|
|
" (if x\n (cadr x)\n (beg",
|
|
"in\n (set! renames `((,var ,(make-identifier var env)",
|
|
" (,(the 'make-identifier) ',var ',env)) . ,renames))\n ",
|
|
" (rename var)))))))\n\n (define (syntax-quasiquote? form)\n (and (",
|
|
"pair? form)\n (variable? (car form))\n (variable=? (th",
|
|
"e 'syntax-quasiquote) (make-identifier (car form) env))))\n\n (define (synt",
|
|
"ax-unquote? form)\n (and (pair? form)\n (variable? (car for",
|
|
"m))\n (variable=? (the 'syntax-unquote) (make-identifier (car form)",
|
|
" env))))\n\n (define (syntax-unquote-splicing? form)\n (and (pair? ",
|
|
"form)\n (pair? (car form))\n (variable? (caar form))\n ",
|
|
" (variable=? (the 'syntax-unquote-splicing) (make-identifier (caar ",
|
|
"form) env))))\n\n (define (qq depth expr)\n (cond\n ;; syn",
|
|
"tax-unquote\n ((syntax-unquote? expr)\n (if (= depth 1)\n ",
|
|
" (car (cdr expr))\n (list (the 'list)\n ",
|
|
" (list (the 'quote) (the 'syntax-unquote))\n (qq (- depth",
|
|
" 1) (car (cdr expr))))))\n ;; syntax-unquote-splicing\n ((synt",
|
|
"ax-unquote-splicing? expr)\n (if (= depth 1)\n (list (th",
|
|
"e 'append)\n (car (cdr (car expr)))\n (q",
|
|
"q depth (cdr expr)))\n (list (the 'cons)\n (li",
|
|
"st (the 'list)\n (list (the 'quote) (the 'syntax-unquo",
|
|
"te-splicing))\n (qq (- depth 1) (car (cdr (car expr)))",
|
|
"))\n (qq depth (cdr expr)))))\n ;; syntax-quasiquot",
|
|
"e\n ((syntax-quasiquote? expr)\n (list (the 'list)\n ",
|
|
" (list (the 'quote) (the 'quasiquote))\n (qq (+ depth 1) ",
|
|
"(car (cdr expr)))))\n ;; list\n ((pair? expr)\n (lis",
|
|
"t (the 'cons)\n (qq depth (car expr))\n (qq dept",
|
|
"h (cdr expr))))\n ;; vector\n ((vector? expr)\n (lis",
|
|
"t (the 'list->vector) (qq depth (vector->list expr))))\n ;; variable\n ",
|
|
" ((variable? expr)\n (rename expr))\n ;; simple datum",
|
|
"\n (else\n (list (the 'quote) expr))))\n\n (let ((body (",
|
|
"qq 1 (cadr form))))\n `(,(the 'let)\n ,(map cdr renames)\n ",
|
|
" ,body))))))\n\n(define (transformer f)\n (lambda (form env)\n (let ((regi",
|
|
"ster1 (make-register))\n (register2 (make-register)))\n (letrec\n ",
|
|
" ((wrap (lambda (var1)\n (let ((var2 (register1 var1)))\n ",
|
|
" (if (undefined? var2)\n (let ((var2 (m",
|
|
"ake-identifier var1 env)))\n (register1 var1 var2)\n ",
|
|
" (register2 var2 var1)\n var2)\n ",
|
|
" var2))))\n (unwrap (lambda (var2)\n ",
|
|
" (let ((var1 (register2 var2)))\n (if (undefined? var",
|
|
"1)\n var2\n var1))))\n ",
|
|
" (walk (lambda (f form)\n (cond\n ((variable",
|
|
"? form)\n (f form))\n ((pair? form)\n ",
|
|
" (cons (walk f (car form)) (walk f (cdr form))))\n ",
|
|
" ((vector? form)\n (list->vector (walk f (vector->list form)",
|
|
")))\n (else\n form)))))\n (let ((form",
|
|
" (cdr form)))\n (walk unwrap (apply f (walk wrap form))))))))\n\n(define-m",
|
|
"acro define-syntax\n (lambda (form env)\n (let ((formal (car (cdr form)))\n ",
|
|
" (body (cdr (cdr form))))\n (if (pair? formal)\n `(,(the 'def",
|
|
"ine-syntax) ,(car formal) (,the-lambda ,(cdr formal) ,@body))\n `(,the-d",
|
|
"efine-macro ,formal (,(the 'transformer) (,the-begin ,@body)))))))\n\n(define-macr",
|
|
"o letrec-syntax\n (lambda (form env)\n (let ((formal (car (cdr form)))\n ",
|
|
" (body (cdr (cdr form))))\n `(let ()\n ,@(map (lambda (x)\n ",
|
|
" `(,(the 'define-syntax) ,(car x) ,(cadr x)))\n formal)\n",
|
|
" ,@body))))\n\n(define-macro let-syntax\n (lambda (form env)\n `(,(the '",
|
|
"letrec-syntax) ,@(cdr form))))\n\n\n;;; library primitives\n\n(define-macro define-li",
|
|
"brary\n (lambda (form _)\n (let ((name (cadr form))\n (body (cddr form",
|
|
")))\n (let ((old-library (current-library))\n (new-library (or (fi",
|
|
"nd-library name) (make-library name))))\n (let ((env (library-environment ",
|
|
"new-library)))\n (current-library new-library)\n (for-each (lamb",
|
|
"da (expr) (eval expr env)) body)\n (current-library old-library))))))\n\n(",
|
|
"define-macro cond-expand\n (lambda (form _)\n (letrec\n ((test (lambda (",
|
|
"form)\n (or\n (eq? form 'else)\n ",
|
|
"(and (symbol? form)\n (memq form (features)))\n ",
|
|
" (and (pair? form)\n (case (car form)\n ",
|
|
" ((library) (find-library (cadr form)))\n ((not) (",
|
|
"not (test (cadr form))))\n ((and) (let loop ((form (cdr f",
|
|
"orm)))\n (or (null? form)\n ",
|
|
" (and (test (car form)) (loop (cdr form))))))\n ",
|
|
" ((or) (let loop ((form (cdr form)))\n (and ",
|
|
"(pair? form)\n (or (test (car form)) (loop (",
|
|
"cdr form))))))\n (else #f)))))))\n (let loop ((clause",
|
|
"s (cdr form)))\n (if (null? clauses)\n #undefined\n (i",
|
|
"f (test (caar clauses))\n `(,the-begin ,@(cdar clauses))\n ",
|
|
" (loop (cdr clauses))))))))\n\n(define-macro import\n (lambda (form _)\n (",
|
|
"let ((caddr\n (lambda (x) (car (cdr (cdr x)))))\n (prefix\n ",
|
|
" (lambda (prefix symbol)\n (string->symbol\n (string",
|
|
"-append\n (symbol->string prefix)\n (symbol->string sy",
|
|
"mbol))))))\n (letrec\n ((extract\n (lambda (spec)\n ",
|
|
" (case (car spec)\n ((only rename prefix except)\n ",
|
|
" (extract (cadr spec)))\n (else\n (or (find-lib",
|
|
"rary spec) (error \"library not found\" spec))))))\n (collect\n ",
|
|
" (lambda (spec)\n (case (car spec)\n ((only)\n ",
|
|
" (let ((alist (collect (cadr spec))))\n (map (lambda (va",
|
|
"r) (assq var alist)) (cddr spec))))\n ((rename)\n (",
|
|
"let ((alist (collect (cadr spec))))\n (map (lambda (s) (or (ass",
|
|
"q (car s) (cddr spec)) s)) alist)))\n ((prefix)\n (",
|
|
"let ((alist (collect (cadr spec))))\n (map (lambda (s) (cons (p",
|
|
"refix (caddr spec) (car s)) (cdr s))) alist)))\n ((except)\n ",
|
|
" (let ((alist (collect (cadr spec))))\n (let loop ((al",
|
|
"ist alist))\n (if (null? alist)\n '()\n",
|
|
" (if (memq (caar alist) (cddr spec))\n ",
|
|
" (loop (cdr alist))\n (cons (car alist) (loo",
|
|
"p (cdr alist))))))))\n (else\n (let ((lib (or (find",
|
|
"-library spec) (error \"library not found\" spec))))\n (map (lamb",
|
|
"da (x) (cons x x)) (library-exports lib))))))))\n (letrec\n ((im",
|
|
"port\n (lambda (spec)\n (let ((lib (extract spec))\n ",
|
|
" (alist (collect spec)))\n (for-each\n ",
|
|
" (lambda (slot)\n (library-import lib (cdr slo",
|
|
"t) (car slot)))\n alist)))))\n (for-each import (cdr f",
|
|
"orm)))))))\n\n(define-macro export\n (lambda (form _)\n (letrec\n ((collec",
|
|
"t\n (lambda (spec)\n (cond\n ((symbol? spec)\n ",
|
|
" `(,spec . ,spec))\n ((and (list? spec) (= (length spec) 3) (e",
|
|
"q? (car spec) 'rename))\n `(,(list-ref spec 1) . ,(list-ref spec 2))",
|
|
")\n (else\n (error \"malformed export\")))))\n (expo",
|
|
"rt\n (lambda (spec)\n (let ((slot (collect spec)))\n ",
|
|
" (library-export (car slot) (cdr slot))))))\n (for-each export (cdr for",
|
|
"m)))))\n\n(export define-library\n cond-expand\n import\n export",
|
|
")\n\n(export let let* letrec letrec*\n let-values let*-values define-values\n",
|
|
" quasiquote unquote unquote-splicing\n and or\n cond case els",
|
|
"e =>\n do when unless\n parameterize\n define-syntax\n s",
|
|
"yntax-quote syntax-unquote\n syntax-quasiquote syntax-unquote-splicing\n ",
|
|
" let-syntax letrec-syntax\n syntax-error)\n\n\n",
|
|
"",
|
|
""
|
|
};
|
|
|
|
#if 0
|
|
Local Variables:
|
|
mode: scheme
|
|
End:
|
|
|
|
=cut
|
|
#endif
|