564 lines
13 KiB
Scheme
564 lines
13 KiB
Scheme
(define-library (scheme base)
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(import (picrin base)
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(picrin macro)
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(picrin syntax-rules)
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(picrin string)
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(scheme file))
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;; 4.1.2. Literal expressions
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(export quote)
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;; 4.1.4. Procedures
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(export lambda)
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;; 4.1.5. Conditionals
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(export if)
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;; 4.1.6. Assignments
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(export set!)
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;; 4.1.7. Inclusion
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(define-syntax include
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(letrec ((read-file
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(lambda (filename)
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(call-with-port (open-input-file filename)
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(lambda (port)
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(let loop ((expr (read port)) (exprs '()))
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(if (eof-object? expr)
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(reverse exprs)
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(loop (read port) (cons expr exprs)))))))))
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(er-macro-transformer
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(lambda (form rename compare)
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(let ((filenames (cdr form)))
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(let ((exprs (apply append (map read-file filenames))))
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`(,(rename 'begin) ,@exprs)))))))
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(export include)
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;; 4.2.1. Conditionals
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(export cond
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case
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else
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=>
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and
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or
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when
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unless)
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;; 4.2.2. Binding constructs
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(export let
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let*
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letrec
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letrec*
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let-values
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let*-values)
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;; 4.2.3. Sequencing
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(export begin)
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;; 4.2.4. Iteration
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(export do)
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;; 4.2.6. Dynamic bindings
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(export make-parameter
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parameterize)
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;; 4.2.7. Exception handling
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(define-syntax (guard-aux reraise . clauses)
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(letrec
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((else?
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(lambda (clause)
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(and (list? clause) (equal? #'else (car clause)))))
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(=>?
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(lambda (clause)
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(and (list? clause) (= (length clause) 3) (equal? #'=> (list-ref clause 1))))))
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(if (null? clauses)
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reraise
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(let ((clause (car clauses)))
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(cond
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((else? clause)
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#`(begin #,@(cdr clause)))
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((=>? clause)
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#`(let ((tmp #,(list-ref clause 0)))
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(if tmp
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(#,(list-ref clause 2) tmp)
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(guard-aux #,reraise #,@(cdr clauses)))))
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(else
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#`(if #,(car clause)
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(begin #,@(cdr clause))
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(guard-aux #,reraise #,@(cdr clauses)))))))))
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(define-syntax (guard formal . body)
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(let ((var (car formal))
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(clauses (cdr formal)))
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#`((call/cc
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(lambda (guard-k)
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(with-exception-handler
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(lambda (condition)
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((call/cc
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(lambda (handler-k)
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(guard-k
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(lambda ()
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(let ((#,var condition))
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(guard-aux
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(handler-k
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(lambda ()
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(raise-continuable condition)))
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#,@clauses))))))))
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(lambda ()
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(call-with-values
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(lambda () #,@body)
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(lambda args
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(guard-k
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(lambda ()
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(apply values args))))))))))))
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(export guard)
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;; 4.2.8. Quasiquotation
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(export quasiquote
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unquote
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unquote-splicing)
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;; 4.3.1. Binding constructs for syntactic keywords
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(export let-syntax
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letrec-syntax)
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;; 4.3.2 Pattern language
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(export syntax-rules
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_
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...)
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;; 4.3.3. Signaling errors in macro transformers
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(export syntax-error)
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;; 5.3. Variable definitions
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(export define)
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;; 5.3.3. Multiple-value definitions
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(export define-values)
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;; 5.4. Syntax definitions
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(export define-syntax)
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;; 5.5 Recored-type definitions
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(define ((boot-make-record-type <meta-type>) name)
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(let ((rectype (make-record <meta-type>)))
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(record-set! rectype 'name name)
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rectype))
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(define <record-type>
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(let ((<record-type> ((boot-make-record-type #t) 'record-type)))
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(record-set! <record-type> '@@type <record-type>)
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<record-type>))
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(define make-record-type (boot-make-record-type <record-type>))
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(define-syntax (define-record-constructor type name . fields)
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(let ((record #'record))
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#`(define (#,name . #,fields)
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(let ((#,record (make-record #,type)))
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#,@(map (lambda (field) #`(record-set! #,record '#,field #,field)) fields)
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#,record))))
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(define-syntax (define-record-predicate type name)
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#`(define (#,name obj)
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(and (record? obj)
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(eq? (record-type obj) #,type))))
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(define-syntax (define-record-accessor pred field accessor)
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#`(define (#,accessor record)
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(if (#,pred record)
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(record-ref record '#,field)
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(error (string-append (symbol->string '#,accessor) ": wrong record type") record))))
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(define-syntax (define-record-modifier pred field modifier)
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#`(define (#,modifier record val)
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(if (#,pred record)
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(record-set! record '#,field val)
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(error (string-append (symbol->string '#,modifier) ": wrong record type") record))))
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(define-syntax (define-record-field pred field accessor . modifier-opt)
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(if (null? modifier-opt)
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#`(define-record-accessor #,pred #,field #,accessor)
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#`(begin
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(define-record-accessor #,pred #,field #,accessor)
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(define-record-modifier #,pred #,field #,(car modifier-opt)))))
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(define-syntax (define-record-type name ctor pred . fields)
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#`(begin
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(define #,name (make-record-type '#,name))
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(define-record-constructor #,name #,@ctor)
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(define-record-predicate #,name #,pred)
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#,@(map (lambda (field) #`(define-record-field #,pred #,@field)) fields)))
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(export define-record-type)
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;; 6.1. Equivalence predicates
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(export eq?
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eqv?
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equal?)
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;; 6.2. Numbers
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(define (exact-integer? x)
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(and (exact? x)
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(integer? x)))
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(define (zero? x)
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(= x 0))
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(define (positive? x)
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(> x 0))
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(define (negative? x)
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(< x 0))
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(define (even? x)
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(= x (* (exact (floor (/ x 2))) 2)))
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(define (odd? x)
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(not (even? x)))
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(define (min . args)
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(define (min a b)
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(if (< a b) a b))
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(let loop ((args args) (acc +inf.0) (exactp #t))
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(if (null? args)
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(if exactp acc (inexact acc))
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(loop (cdr args) (min (car args) acc) (and (exact? (car args)) exactp)))))
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(define (max . args)
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(define (max a b)
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(if (> a b) a b))
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(let loop ((args args) (acc -inf.0) (exactp #t))
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(if (null? args)
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(if exactp acc (inexact acc))
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(loop (cdr args) (max (car args) acc) (and (exact? (car args)) exactp)))))
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(define (floor-quotient i j)
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(call-with-values (lambda () (floor/ i j))
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(lambda (q r)
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q)))
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(define (floor-remainder i j)
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(call-with-values (lambda () (floor/ i j))
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(lambda (q r)
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r)))
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(define (truncate-quotient i j)
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(call-with-values (lambda () (truncate/ i j))
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(lambda (q r)
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q)))
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(define (truncate-remainder i j)
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(call-with-values (lambda () (truncate/ i j))
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(lambda (q r)
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r)))
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(define (gcd . args)
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(define (gcd i j)
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(cond
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((> i j) (gcd j i))
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((< i 0) (gcd (- i) j))
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((> i 0) (gcd (truncate-remainder j i) i))
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(else j)))
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(let loop ((args args) (acc 0))
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(if (null? args)
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acc
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(loop (cdr args)
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(gcd acc (car args))))))
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(define (lcm . args)
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(define (lcm i j)
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(/ (abs (* i j)) (gcd i j)))
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(let loop ((args args) (acc 1))
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(if (null? args)
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acc
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(loop (cdr args)
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(lcm acc (car args))))))
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(define (square x)
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(* x x))
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(define (exact-integer-sqrt k)
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(let ((s (exact (floor (sqrt k)))))
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(values s (- k (square s)))))
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(export number?
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complex?
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real?
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rational?
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integer?
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exact?
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inexact?
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exact-integer?
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exact
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inexact
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=
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<
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>
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<=
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>=
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zero?
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positive?
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negative?
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odd?
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even?
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min
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max
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+
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-
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*
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/
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abs
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floor-quotient
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floor-remainder
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floor/
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truncate-quotient
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truncate-remainder
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truncate/
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(rename truncate-quotient quotient)
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(rename truncate-remainder remainder)
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(rename floor-remainder modulo)
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gcd
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lcm
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floor
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ceiling
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truncate
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round
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exact-integer-sqrt
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square
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expt
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number->string
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string->number)
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;; 6.3. Booleans
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(export boolean?
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boolean=?
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not)
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;; 6.4 Pairs and lists
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(export pair?
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cons
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car
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cdr
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set-car!
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set-cdr!
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null?
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caar
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cadr
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cdar
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cddr
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list?
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make-list
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list
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length
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append
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reverse
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list-tail
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list-ref
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list-set!
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list-copy
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memq
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memv
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member
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assq
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assv
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assoc)
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;; 6.5. Symbols
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(export symbol?
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symbol=?
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symbol->string
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string->symbol)
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;; 6.6. Characters
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(export char?
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char->integer
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integer->char
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char=?
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char<?
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char>?
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char<=?
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char>=?)
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;; 6.7. Strings
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(export string?
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string
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make-string
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string-length
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string-ref
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string-set!
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string-copy
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string-copy!
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string-append
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(rename string-copy substring)
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string-fill!
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string->list
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list->string
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string=?
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string<?
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string>?
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string<=?
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string>=?)
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;; 6.8. Vectors
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(export vector?
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vector
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make-vector
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vector-length
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vector-ref
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vector-set!
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vector-copy!
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vector-copy
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vector-append
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vector-fill!
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list->vector
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vector->list
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string->vector
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vector->string)
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;; 6.9. Bytevectors
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(define (utf8->string v . opts)
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(let ((start (if (pair? opts) (car opts) 0))
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(end (if (>= (length opts) 2)
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(cadr opts)
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(bytevector-length v))))
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(list->string (map integer->char (bytevector->list v start end)))))
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(define (string->utf8 s . opts)
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(let ((start (if (pair? opts) (car opts) 0))
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(end (if (>= (length opts) 2)
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(cadr opts)
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(string-length s))))
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(list->bytevector (map char->integer (string->list s start end)))))
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(export bytevector?
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bytevector
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make-bytevector
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bytevector-length
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bytevector-u8-ref
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bytevector-u8-set!
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bytevector-copy
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bytevector-copy!
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bytevector-append
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bytevector->list
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list->bytevector
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utf8->string
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string->utf8)
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;; 6.10. Control features
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(export procedure?
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apply
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map
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for-each
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string-map
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string-for-each
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vector-map
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vector-for-each
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call-with-current-continuation
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call/cc
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dynamic-wind
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values
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call-with-values)
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;; 6.11. Exceptions
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(define (read-error? obj)
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(and (error-object? obj)
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(eq? (error-object-type obj) 'read)))
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(define (file-error? obj)
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(and (error-object? obj)
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(eq? (error-object-type obj) 'file)))
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(export with-exception-handler
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raise
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raise-continuable
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error
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error-object?
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error-object-message
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error-object-irritants
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read-error?
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file-error?)
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;; 6.13. Input and output
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(export current-input-port
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current-output-port
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current-error-port
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call-with-port
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port?
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input-port?
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output-port?
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textual-port?
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binary-port?
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(rename port-open? input-port-open?)
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(rename port-open? output-port-open?)
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close-port
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(rename close-port close-input-port)
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(rename close-port close-output-port)
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open-input-string
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open-output-string
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get-output-string
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open-input-bytevector
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open-output-bytevector
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get-output-bytevector
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eof-object?
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eof-object
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read-char
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peek-char
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char-ready?
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read-line
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read-string
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read-u8
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peek-u8
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u8-ready?
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read-bytevector
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read-bytevector!
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newline
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write-char
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write-string
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write-u8
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write-bytevector
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flush-output-port)
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(export features))
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