921 lines
25 KiB
Scheme
921 lines
25 KiB
Scheme
;;; Appendix A. Standard Libraries CxR
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(define-library (scheme cxr)
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(import (scheme base))
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(define (caaar p) (car (caar p)))
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(define (caadr p) (car (cadr p)))
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(define (cadar p) (car (cdar p)))
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(define (caddr p) (car (cddr p)))
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(define (cdaar p) (cdr (caar p)))
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(define (cdadr p) (cdr (cadr p)))
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(define (cddar p) (cdr (cdar p)))
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(define (cdddr p) (cdr (cddr p)))
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(define (caaaar p) (caar (caar p)))
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(define (caaadr p) (caar (cadr p)))
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(define (caadar p) (caar (cdar p)))
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(define (caaddr p) (caar (cddr p)))
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(define (cadaar p) (cadr (caar p)))
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(define (cadadr p) (cadr (cadr p)))
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(define (caddar p) (cadr (cdar p)))
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(define (cadddr p) (cadr (cddr p)))
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(define (cdaaar p) (cdar (caar p)))
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(define (cdaadr p) (cdar (cadr p)))
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(define (cdadar p) (cdar (cdar p)))
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(define (cdaddr p) (cdar (cddr p)))
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(define (cddaar p) (cddr (caar p)))
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(define (cddadr p) (cddr (cadr p)))
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(define (cdddar p) (cddr (cdar p)))
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(define (cddddr p) (cddr (cddr p)))
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(export caaar caadr cadar caddr
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cdaar cdadr cddar cdddr
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caaaar caaadr caadar caaddr
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cadaar cadadr caddar cadddr
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cdaaar cdaadr cdadar cdaddr
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cddaar cddadr cdddar cddddr))
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;;; hygienic macros
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(define-library (picrin macro)
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(import (scheme base))
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(define (sc-macro-transformer f)
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(lambda (expr use-env mac-env)
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(make-syntactic-closure mac-env '() (f expr use-env))))
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(define (rsc-macro-transformer f)
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(lambda (expr use-env mac-env)
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(make-syntactic-closure use-env '() (f expr mac-env))))
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(export sc-macro-transformer
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rsc-macro-transformer))
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;;; core syntaces
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(define-library (picrin core-syntax)
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(import (scheme base)
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(scheme cxr)
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(picrin macro))
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(define-syntax let
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(er-macro-transformer
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(lambda (expr r compare)
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(if (symbol? (cadr expr))
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(begin
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(define name (cadr expr))
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(define bindings (caddr expr))
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(define body (cdddr expr))
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(list (r 'let) '()
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(list (r 'define) name
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(cons (r 'lambda) (cons (map car bindings) body)))
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(cons name (map cadr bindings))))
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(begin
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(set! bindings (cadr expr))
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(set! body (cddr expr))
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(cons (cons (r 'lambda) (cons (map car bindings) body))
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(map cadr bindings)))))))
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(define-syntax cond
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(er-macro-transformer
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(lambda (expr r compare)
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(let ((clauses (cdr expr)))
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(if (null? clauses)
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#f
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(if (compare (r 'else) (caar clauses))
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(cons (r 'begin) (cdar clauses))
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(list (r 'if) (caar clauses)
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(cons (r 'begin) (cdar clauses))
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(cons (r 'cond) (cdr clauses)))))))))
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(define (single? list)
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(if (pair? list)
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(null? (cdr list))
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#f))
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(define-syntax and
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(er-macro-transformer
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(lambda (expr r compare)
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(let ((exprs (cdr expr)))
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(cond
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((null? exprs)
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#t)
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((single? exprs)
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(car exprs))
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(else
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(list (r 'let) (list (list (r 'it) (car exprs)))
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(list (r 'if) (r 'it)
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(cons (r 'and) (cdr exprs))
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(r 'it)))))))))
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(define-syntax or
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(er-macro-transformer
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(lambda (expr r compare)
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(let ((exprs (cdr expr)))
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(cond
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((null? exprs)
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#t)
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((single? exprs)
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(car exprs))
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(else
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(list (r 'let) (list (list (r 'it) (car exprs)))
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(list (r 'if) (r 'it)
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(r 'it)
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(cons (r 'or) (cdr exprs))))))))))
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(define (quasiquote? form compare?)
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(and (pair? form) (compare? (car form) 'quasiquote)))
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(define (unquote? form compare?)
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(and (pair? form) (compare? (car form) 'unquote)))
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(define (unquote-splicing? form compare?)
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(and (pair? form) (pair? (car form)) (compare? (car (car form)) 'unquote-splicing)))
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(define-syntax quasiquote
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(ir-macro-transformer
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(lambda (form inject compare)
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(define (qq depth expr)
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(cond
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;; unquote
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((unquote? expr compare)
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(if (= depth 1)
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(car (cdr expr))
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(list 'list
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(list 'quote (inject 'unquote))
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(qq (- depth 1) (car (cdr expr))))))
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;; unquote-splicing
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((unquote-splicing? expr compare)
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(if (= depth 1)
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(list 'append
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(car (cdr (car expr)))
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(qq depth (cdr expr)))
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(list 'cons
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(list 'list
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(list 'quote (inject '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 compare)
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(list 'list
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(list 'quote (inject '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 'cons
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(qq depth (car expr))
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(qq depth (cdr expr))))
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;; simple datum
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(else
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(list 'quote expr))))
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(let ((x (cadr form)))
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(qq 1 x)))))
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#;
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(define-syntax let*
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(ir-macro-transformer
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(lambda (form inject compare)
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(let ((bindings (cadr form))
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(body (cddr form)))
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(if (null? bindings)
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`(let () ,@body)
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`(let ((,(caar bindings)
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,@(cdar bindings)))
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(let* (,@(cdr bindings))
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,@body)))))))
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(define-syntax let*
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(er-macro-transformer
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(lambda (form r compare)
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(let ((bindings (cadr form))
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(body (cddr form)))
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(if (null? bindings)
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`(,(r 'let) () ,@body)
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`(,(r 'let) ((,(caar bindings)
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,@(cdar bindings)))
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(,(r 'let*) (,@(cdr bindings))
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,@body)))))))
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(define-syntax letrec*
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(er-macro-transformer
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(lambda (form r compare)
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(let ((bindings (cadr form))
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(body (cddr form)))
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(let ((vars (map (lambda (v) `(,v #f)) (map car bindings)))
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(initials (map (lambda (v) `(,(r 'set!) ,@v)) bindings)))
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`(,(r 'let) (,@vars)
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,@initials
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,@body))))))
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(define-syntax letrec
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(er-macro-transformer
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(lambda (form rename compare)
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`(,(rename 'letrec*) ,@(cdr form)))))
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(define-syntax do
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(er-macro-transformer
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(lambda (form r compare)
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(let ((bindings (cadr form))
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(finish (caddr form))
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(body (cdddr form)))
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`(,(r 'let) ,(r 'loop) ,(map (lambda (x)
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(list (car x) (cadr x)))
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bindings)
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(,(r 'if) ,(car finish)
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(,(r 'begin) ,@(cdr finish))
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(,(r 'begin) ,@body
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(,(r 'loop) ,@(map (lambda (x)
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(if (null? (cddr x))
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(car x)
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(car (cddr x))))
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bindings)))))))))
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(define-syntax when
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(er-macro-transformer
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(lambda (expr rename compare)
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(let ((test (cadr expr))
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(body (cddr expr)))
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`(,(rename 'if) ,test
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(,(rename 'begin) ,@body)
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#f)))))
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(define-syntax unless
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(er-macro-transformer
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(lambda (expr rename compare)
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(let ((test (cadr expr))
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(body (cddr expr)))
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`(,(rename 'if) ,test
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#f
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(,(rename 'begin) ,@body))))))
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(define-syntax case
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(er-macro-transformer
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(lambda (expr r compare)
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(let ((key (cadr expr))
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(clauses (cddr expr)))
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`(,(r 'let) ((,(r 'key) ,key))
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,(let loop ((clauses clauses))
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(if (null? clauses)
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#f
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`(,(r 'if) (,(r 'or)
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,@(map (lambda (x) `(,(r 'eqv?) ,(r 'key) (,(r 'quote) ,x)))
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(caar clauses)))
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(begin ,@(cdar clauses))
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,(loop (cdr clauses))))))))))
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(define-syntax syntax-error
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(er-macro-transformer
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(lambda (expr rename compare)
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(apply error (cdr expr)))))
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(define-syntax define-auxiliary-syntax
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(er-macro-transformer
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(lambda (expr r c)
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`(,(r 'define-syntax) ,(cadr expr)
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(,(r 'sc-macro-transformer)
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(,(r 'lambda) (expr env)
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(,(r 'error) "invalid use of auxiliary syntax")))))))
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(define-auxiliary-syntax else)
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(define-auxiliary-syntax =>)
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(define-auxiliary-syntax _)
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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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(export let let* letrec letrec*
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quasiquote unquote unquote-splicing
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and or
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cond case else =>
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do when unless
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_ ... syntax-error))
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;;; multiple value
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(define-library (picrin multiple-value)
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(import (scheme base)
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(scheme cxr)
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(picrin macro)
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(picrin core-syntax))
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(define-syntax let*-values
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(er-macro-transformer
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(lambda (form r c)
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(let ((formals (cadr form)))
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(if (null? formals)
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`(,(r 'let) () ,@(cddr form))
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`(,(r 'call-with-values) (,(r 'lambda) () ,@(cdar formals))
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(,(r 'lambda) (,@(caar formals))
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(,(r 'let*-values) (,@(cdr formals))
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,@(cddr form)))))))))
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(define-syntax let-values
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(er-macro-transformer
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(lambda (form r c)
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`(,(r 'let*-values) ,@(cdr form)))))
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(define-syntax define-values
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(er-macro-transformer
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(lambda (form r c)
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(let ((formals (cadr form)))
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`(,(r 'begin)
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,@(do ((vars formals (cdr vars))
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(defs '()))
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((null? vars)
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defs)
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(set! defs (cons `(,(r 'define) ,(car vars) #f) defs)))
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(,(r 'call-with-values)
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(,(r 'lambda) () ,@(cddr form))
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(,(r 'lambda) (,@(map r formals))
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,@(do ((vars formals (cdr vars))
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(assn '()))
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((null? vars)
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assn)
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(set! assn (cons `(,(r 'set!) ,(car vars) ,(r (car vars))) assn))))))))))
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(export let-values
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let*-values
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define-values))
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;;; parameter
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(define-library (picrin parameter)
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(import (scheme base)
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(scheme cxr)
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(picrin macro)
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(picrin core-syntax))
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;; reopen (pircin parameter)
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;; see src/var.c
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(define-syntax parameterize
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(er-macro-transformer
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(lambda (form r compare)
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(let ((bindings (cadr form))
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(body (cddr form)))
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(let ((vars (map car bindings))
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(gensym (lambda (var)
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(string->symbol
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(string-append
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"parameterize-"
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(symbol->string var))))))
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`(,(r 'let) (,@(map (lambda (var)
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`(,(r (gensym var)) (,var)))
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vars))
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,@bindings
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(,(r 'let) ((,(r 'result) (begin ,@body)))
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,@(map (lambda (var)
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`(,(r 'parameter-set!) ,var ,(r (gensym var))))
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vars)
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,(r 'result))))))))
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(export parameterize))
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;;; Record Type
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(define-library (picrin record)
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(import (scheme base)
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(scheme cxr)
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(picrin macro)
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(picrin core-syntax))
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(define record-marker (list 'record-marker))
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(define real-vector? vector?)
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(set! vector?
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(lambda (x)
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(and (real-vector? x)
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(or (= 0 (vector-length x))
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(not (eq? (vector-ref x 0)
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record-marker))))))
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#|
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;; (scheme eval) is not provided for now
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(define eval
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(let ((real-eval eval))
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(lambda (exp env)
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((real-eval `(lambda (vector?) ,exp))
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vector?))))
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|#
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(define (record? x)
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(and (real-vector? x)
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(< 0 (vector-length x))
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(eq? (vector-ref x 0) record-marker)))
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(define (make-record size)
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(let ((new (make-vector (+ size 1))))
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(vector-set! new 0 record-marker)
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new))
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(define (record-ref record index)
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(vector-ref record (+ index 1)))
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(define (record-set! record index value)
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(vector-set! record (+ index 1) value))
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(define record-type% (make-record 3))
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(record-set! record-type% 0 record-type%)
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(record-set! record-type% 1 'record-type%)
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(record-set! record-type% 2 '(name field-tags))
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(define (make-record-type name field-tags)
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(let ((new (make-record 3)))
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(record-set! new 0 record-type%)
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(record-set! new 1 name)
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(record-set! new 2 field-tags)
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new))
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(define (record-type record)
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(record-ref record 0))
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(define (record-type-name record-type)
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(record-ref record-type 1))
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(define (record-type-field-tags record-type)
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(record-ref record-type 2))
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(define (field-index type tag)
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(let rec ((i 1) (tags (record-type-field-tags type)))
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(cond ((null? tags)
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(error "record type has no such field" type tag))
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((eq? tag (car tags)) i)
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(else (rec (+ i 1) (cdr tags))))))
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(define (record-constructor type tags)
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(let ((size (length (record-type-field-tags type)))
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(arg-count (length tags))
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(indexes (map (lambda (tag) (field-index type tag)) tags)))
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(lambda args
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(if (= (length args) arg-count)
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(let ((new (make-record (+ size 1))))
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(record-set! new 0 type)
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(for-each (lambda (arg i) (record-set! new i arg)) args indexes)
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new)
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(error "wrong number of arguments to constructor" type args)))))
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(define (record-predicate type)
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(lambda (thing)
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(and (record? thing)
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(eq? (record-type thing)
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type))))
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(define (record-accessor type tag)
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(let ((index (field-index type tag)))
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(lambda (thing)
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(if (and (record? thing)
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(eq? (record-type thing)
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type))
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(record-ref thing index)
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(error "accessor applied to bad value" type tag thing)))))
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(define (record-modifier type tag)
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(let ((index (field-index type tag)))
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(lambda (thing value)
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(if (and (record? thing)
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(eq? (record-type thing)
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type))
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(record-set! thing index value)
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(error "modifier applied to bad value" type tag thing)))))
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(define-syntax define-record-field
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(ir-macro-transformer
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(lambda (form inject compare?)
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(let ((type (cadr form))
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(field-tag (caddr form))
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(acc-mod (cdddr form)))
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(if (= 1 (length acc-mod))
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`(define ,(car acc-mod)
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(record-accessor ,type ',field-tag))
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`(begin
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(define ,(car acc-mod)
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(record-accessor ,type ',field-tag))
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(define ,(cadr acc-mod)
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(record-modifier ,type ',field-tag))))))))
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(define-syntax define-record-type
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(ir-macro-transformer
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(lambda (form inject compare?)
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(let ((type (cadr form))
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(constructor (caddr form))
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(predicate (cadddr form))
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(field-tag (cddddr form)))
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`(begin
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(define ,type
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(make-record-type ',type ',(cdr constructor)))
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(define ,(car constructor)
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(record-constructor ,type ',(cdr constructor)))
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(define ,predicate
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(record-predicate ,type))
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,@(map
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(lambda (x)
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`(define-record-field ,type ,(car x) ,(cadr x) ,@(cddr x)))
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field-tag))))))
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(export define-record-type vector?))
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(import (picrin macro)
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(picrin core-syntax)
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(picrin multiple-value)
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|
(picrin parameter)
|
|
(picrin record))
|
|
|
|
(export let let* letrec letrec*
|
|
quasiquote unquote unquote-splicing
|
|
and or
|
|
cond case else =>
|
|
do when unless
|
|
_ ... syntax-error)
|
|
|
|
(export let-values
|
|
let*-values
|
|
define-values)
|
|
|
|
(export make-parameter
|
|
parameterize)
|
|
|
|
(export vector? ; override definition
|
|
define-record-type)
|
|
|
|
(define (every pred list)
|
|
(if (null? list)
|
|
#t
|
|
(if (pred (car list))
|
|
(every pred (cdr list))
|
|
#f)))
|
|
|
|
(define (fold f s xs)
|
|
(if (null? xs)
|
|
s
|
|
(fold f (f (car xs) s) (cdr xs))))
|
|
|
|
;;; 6.2. Numbers
|
|
|
|
(define (floor/ n m)
|
|
(values (floor-quotient n m)
|
|
(floor-remainder n m)))
|
|
|
|
(define (truncate/ n m)
|
|
(values (truncate-quotient n m)
|
|
(truncate-remainder n m)))
|
|
|
|
; (import (only (scheme inexact) sqrt))
|
|
(import (scheme inexact))
|
|
|
|
(define (exact-integer-sqrt k)
|
|
(let ((n (exact (floor (sqrt k)))))
|
|
(values n (- k (square n)))))
|
|
|
|
(export floor/ truncate/
|
|
exact-integer-sqrt)
|
|
|
|
;;; 6.3 Booleans
|
|
|
|
(define (boolean=? . objs)
|
|
(or (every (lambda (x) (eq? x #t)) objs)
|
|
(every (lambda (x) (eq? x #f)) objs)))
|
|
|
|
(export boolean=?)
|
|
|
|
;;; 6.4 Pairs and lists
|
|
|
|
(define (memq obj list)
|
|
(if (null? list)
|
|
#f
|
|
(if (eq? obj (car list))
|
|
list
|
|
(memq obj (cdr list)))))
|
|
|
|
(define (memv obj list)
|
|
(if (null? list)
|
|
#f
|
|
(if (eqv? obj (car list))
|
|
list
|
|
(memq obj (cdr list)))))
|
|
|
|
(define (assq obj list)
|
|
(if (null? list)
|
|
#f
|
|
(if (eq? obj (caar list))
|
|
(car list)
|
|
(assq obj (cdr list)))))
|
|
|
|
(define (assv obj list)
|
|
(if (null? list)
|
|
#f
|
|
(if (eqv? obj (caar list))
|
|
(car list)
|
|
(assq obj (cdr list)))))
|
|
|
|
(define (member obj list . opts)
|
|
(let ((compare (if (null? opts) equal? (car opts))))
|
|
(if (null? list)
|
|
#f
|
|
(if (compare obj (car list))
|
|
list
|
|
(member obj (cdr list) compare)))))
|
|
|
|
(define (assoc obj list . opts)
|
|
(let ((compare (if (null? opts) equal? (car opts))))
|
|
(if (null? list)
|
|
#f
|
|
(if (compare obj (caar list))
|
|
(car list)
|
|
(assoc obj (cdr list) compare)))))
|
|
|
|
(export memq memv member
|
|
assq assv assoc)
|
|
|
|
;;; 6.5. Symbols
|
|
|
|
(define (symbol=? . objs)
|
|
(let ((sym (car objs)))
|
|
(if (symbol? sym)
|
|
(every (lambda (x)
|
|
(and (symbol? x)
|
|
(eq? x sym)))
|
|
(cdr objs))
|
|
#f)))
|
|
|
|
(export symbol=?)
|
|
|
|
;;; 6.6 Characters
|
|
|
|
(define-macro (define-char-transitive-predicate name op)
|
|
`(define (,name . cs)
|
|
(apply ,op (map char->integer cs))))
|
|
|
|
(define-char-transitive-predicate char=? =)
|
|
(define-char-transitive-predicate char<? <)
|
|
(define-char-transitive-predicate char>? >)
|
|
(define-char-transitive-predicate char<=? <=)
|
|
(define-char-transitive-predicate char>=? >=)
|
|
|
|
(export char=?
|
|
char<?
|
|
char>?
|
|
char<=?
|
|
char>=?)
|
|
|
|
;;; 6.7 String
|
|
|
|
(define (string->list string . opts)
|
|
(let ((start (if (pair? opts) (car opts) 0))
|
|
(end (if (>= (length opts) 2)
|
|
(cadr opts)
|
|
(string-length string))))
|
|
(do ((i start (+ i 1))
|
|
(res '()))
|
|
((= i end)
|
|
(reverse res))
|
|
(set! res (cons (string-ref string i) res)))))
|
|
|
|
(define (list->string list)
|
|
(let ((len (length list)))
|
|
(let ((v (make-string len)))
|
|
(do ((i 0 (+ i 1))
|
|
(l list (cdr l)))
|
|
((= i len)
|
|
v)
|
|
(string-set! v i (car l))))))
|
|
|
|
(define (string . objs)
|
|
(list->string objs))
|
|
|
|
(export string string->list list->string)
|
|
|
|
;;; 6.8. Vector
|
|
|
|
(define (vector . objs)
|
|
(let ((len (length objs)))
|
|
(let ((v (make-vector len)))
|
|
(do ((i 0 (+ i 1))
|
|
(l objs (cdr l)))
|
|
((= i len)
|
|
v)
|
|
(vector-set! v i (car l))))))
|
|
|
|
(define (vector->list vector . opts)
|
|
(let ((start (if (pair? opts) (car opts) 0))
|
|
(end (if (>= (length opts) 2)
|
|
(cadr opts)
|
|
(vector-length vector))))
|
|
(do ((i start (+ i 1))
|
|
(res '()))
|
|
((= i end)
|
|
(reverse res))
|
|
(set! res (cons (vector-ref vector i) res)))))
|
|
|
|
(define (list->vector list)
|
|
(apply vector list))
|
|
|
|
(define (vector-copy! to at from . opts)
|
|
(let ((start (if (pair? opts) (car opts) 0))
|
|
(end (if (>= (length opts) 2)
|
|
(cadr opts)
|
|
(vector-length from))))
|
|
(do ((i at (+ i 1))
|
|
(j start (+ j 1)))
|
|
((= j end))
|
|
(vector-set! to i (vector-ref from j)))))
|
|
|
|
(define (vector-copy v . opts)
|
|
(let ((start (if (pair? opts) (car opts) 0))
|
|
(end (if (>= (length opts) 2)
|
|
(cadr opts)
|
|
(vector-length v))))
|
|
(let ((res (make-vector (vector-length v))))
|
|
(vector-copy! res 0 v start end)
|
|
res)))
|
|
|
|
(define (vector-append . vs)
|
|
(define (vector-append-2-inv w v)
|
|
(let ((res (make-vector (+ (vector-length v) (vector-length w)))))
|
|
(vector-copy! res 0 v)
|
|
(vector-copy! res (vector-length v) w)
|
|
res))
|
|
(fold vector-append-2-inv #() vs))
|
|
|
|
(define (vector-fill! v fill . opts)
|
|
(let ((start (if (pair? opts) (car opts) 0))
|
|
(end (if (>= (length opts) 2)
|
|
(cadr opts)
|
|
(vector-length v))))
|
|
(do ((i start (+ i 1)))
|
|
((= i end)
|
|
#f)
|
|
(vector-set! v i fill))))
|
|
|
|
(define (vector->string . args)
|
|
(list->string (apply vector->list args)))
|
|
|
|
(define (string->vector . args)
|
|
(list->vector (apply string->list args)))
|
|
|
|
(export vector vector->list list->vector
|
|
vector-copy! vector-copy
|
|
vector-append vector-fill!
|
|
vector->string string->vector)
|
|
|
|
;;; 6.9 bytevector
|
|
|
|
(define (bytevector . objs)
|
|
(let ((len (length objs)))
|
|
(let ((v (make-bytevector len)))
|
|
(do ((i 0 (+ i 1))
|
|
(l objs (cdr l)))
|
|
((= i len)
|
|
v)
|
|
(bytevector-u8-set! v i (car l))))))
|
|
|
|
(define (bytevector-copy! to at from . opts)
|
|
(let ((start (if (pair? opts) (car opts) 0))
|
|
(end (if (>= (length opts) 2)
|
|
(cadr opts)
|
|
(bytevector-length from))))
|
|
(do ((i at (+ i 1))
|
|
(j start (+ j 1)))
|
|
((= j end))
|
|
(bytevector-u8-set! to i (bytevector-u8-ref from j)))))
|
|
|
|
(define (bytevector-copy v . opts)
|
|
(let ((start (if (pair? opts) (car opts) 0))
|
|
(end (if (>= (length opts) 2)
|
|
(cadr opts)
|
|
(bytevector-length v))))
|
|
(let ((res (make-bytevector (bytevector-length v))))
|
|
(bytevector-copy! res 0 v start end)
|
|
res)))
|
|
|
|
(define (bytevector-append . vs)
|
|
(define (bytevector-append-2-inv w v)
|
|
(let ((res (make-bytevector (+ (bytevector-length v) (bytevector-length w)))))
|
|
(bytevector-copy! res 0 v)
|
|
(bytevector-copy! res (bytevector-length v) w)
|
|
res))
|
|
(fold bytevector-append-2-inv #() vs))
|
|
|
|
(define (bytevector->list v start end)
|
|
(do ((i start (+ i 1))
|
|
(res '()))
|
|
((= i end)
|
|
(reverse res))
|
|
(set! res (cons (bytevector-u8-ref v i) res))))
|
|
|
|
(define (list->bytevector v)
|
|
(apply bytevector v))
|
|
|
|
(define (utf8->string v . opts)
|
|
(let ((start (if (pair? opts) (car opts) 0))
|
|
(end (if (>= (length opts) 2)
|
|
(cadr opts)
|
|
(bytevector-length v))))
|
|
(list->string (map integer->char (bytevector->list v start end)))))
|
|
|
|
(define (string->utf8 s . opts)
|
|
(let ((start (if (pair? opts) (car opts) 0))
|
|
(end (if (>= (length opts) 2)
|
|
(cadr opts)
|
|
(string-length s))))
|
|
(list->bytevector (map char->integer (string->list s start end)))))
|
|
|
|
(export bytevector
|
|
bytevector-copy!
|
|
bytevector-copy
|
|
bytevector-append
|
|
utf8->string
|
|
string->utf8)
|
|
|
|
;;; 6.10 control features
|
|
|
|
(define (string-map f v . vs)
|
|
(let* ((len (fold min (string-length v) (map string-length vs)))
|
|
(vec (make-string len)))
|
|
(let loop ((n 0))
|
|
(if (= n len)
|
|
vec
|
|
(begin (string-set! vec n
|
|
(apply f (cons (string-ref v n)
|
|
(map (lambda (v) (string-ref v n)) vs))))
|
|
(loop (+ n 1)))))))
|
|
|
|
(define (string-for-each f v . vs)
|
|
(let* ((len (fold min (string-length v) (map string-length vs))))
|
|
(let loop ((n 0))
|
|
(unless (= n len)
|
|
(apply f (string-ref v n)
|
|
(map (lambda (v) (string-ref v n)) vs))
|
|
(loop (+ n 1))))))
|
|
|
|
(define (vector-map f v . vs)
|
|
(let* ((len (fold min (vector-length v) (map vector-length vs)))
|
|
(vec (make-vector len)))
|
|
(let loop ((n 0))
|
|
(if (= n len)
|
|
vec
|
|
(begin (vector-set! vec n
|
|
(apply f (cons (vector-ref v n)
|
|
(map (lambda (v) (vector-ref v n)) vs))))
|
|
(loop (+ n 1)))))))
|
|
|
|
(define (vector-for-each f v . vs)
|
|
(let* ((len (fold min (vector-length v) (map vector-length vs))))
|
|
(let loop ((n 0))
|
|
(unless (= n len)
|
|
(apply f (vector-ref v n)
|
|
(map (lambda (v) (vector-ref v n)) vs))
|
|
(loop (+ n 1))))))
|
|
|
|
(export string-map string-for-each
|
|
vector-map vector-for-each)
|
|
|
|
;;; 6.13. Input and output
|
|
|
|
(define (call-with-port port proc)
|
|
(dynamic-wind
|
|
(lambda () #f)
|
|
(lambda () (proc port))
|
|
(lambda () (close-port port))))
|
|
|
|
(export call-with-port)
|
|
|
|
;;; Appendix A. Standard Libraries Lazy
|
|
(define-library (scheme lazy)
|
|
(import (scheme base)
|
|
(picrin macro))
|
|
|
|
(define-record-type promise
|
|
(make-promise% done obj)
|
|
promise?
|
|
(done promise-done? promise-done!)
|
|
(obj promise-value promise-value!))
|
|
|
|
(define-syntax delay-force
|
|
(ir-macro-transformer
|
|
(lambda (form rename compare?)
|
|
(let ((expr (cadr form)))
|
|
`(make-promise% #f (lambda () ,expr))))))
|
|
|
|
(define-syntax delay
|
|
(ir-macro-transformer
|
|
(lambda (form rename compare?)
|
|
(let ((expr (cadr form)))
|
|
`(delay-force (make-promise% #t ,expr))))))
|
|
|
|
(define (promise-update! new old)
|
|
(promise-done! old (promise-done? new))
|
|
(promise-value! old (promise-value new)))
|
|
|
|
(define (force promise)
|
|
(if (promise-done? promise)
|
|
(promise-value promise)
|
|
(let ((promise* ((promise-value promise))))
|
|
(unless (promise-done? promise)
|
|
(promise-update! promise* promise))
|
|
(force promise))))
|
|
|
|
(define (make-promise obj)
|
|
(if (promise? obj)
|
|
obj
|
|
(make-promise% #f obj)))
|
|
|
|
(export delay-force delay force make-promise promise?))
|