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123 lines
4.1 KiB
Racket
123 lines
4.1 KiB
Racket
#lang racket/base
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(require (for-syntax
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racket/base
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racket/syntax)
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racket/stream
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racket/generic
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net/url
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racket/sequence
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"../unstable/len.rkt"
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"../define.rkt")
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(module+ safe (require racket/contract))
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(define-syntax-rule (make-coercion-error-handler func funcish val)
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(λ (exn) (raise-argument-error 'func (symbol->string 'funcish) val)))
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(define (disjoin . preds) (λ (x) (ormap (λ (pred) (pred x)) preds)))
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(define (conjoin . preds) (λ (x) (andmap (λ (pred) (pred x)) preds)))
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(define-generics+provide+safe stringish
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(any/c . -> . string?)
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(->string stringish)
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#:fast-defaults
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([string? (define ->string values)]
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[(disjoin null? void?) (define (->string x) "")]
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[symbol? (define ->string symbol->string)]
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[number? (define ->string number->string)]
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[path? (define ->string path->string)]
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[(disjoin char? bytes?) (define (->string x) (format "~a" x))]
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[url? (define ->string url->string)]))
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(define (real->int x) (inexact->exact (floor x)))
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(define (string->int x) (let ([strnum (string->number x)])
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(unless (real? strnum)
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(raise-argument-error '->int "eligible string" x))
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(real->int strnum)))
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(define-generics+provide+safe intish
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(any/c . -> . integer?)
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(->int intish)
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#:fast-defaults
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([(disjoin integer? real?) (define ->int real->int)]
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[complex? (define ->int (compose1 real->int real-part))]
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[string? (define ->int string->int)]
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[(disjoin symbol? path? bytes?) (define ->int (compose1 string->int ->string))]
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[char? (define ->int char->integer)]
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[lengthable? (define (->int x)
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(with-handlers ([exn:fail? (make-coercion-error-handler ->int intish? x)])
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(len x)))]))
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(define-generics+provide+safe symbolish
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(any/c . -> . symbol?)
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(->symbol symbolish)
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#:fast-defaults
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([symbol? (define ->symbol values)]
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[stringish? (define (->symbol x)
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(with-handlers ([exn:fail? (make-coercion-error-handler ->symbol symbolish? x)])
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(string->symbol (->string x))))]))
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(define-generics+provide+safe pathish
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(any/c . -> . path?)
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(->path pathish)
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#:fast-defaults
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([path? (define ->path values)]
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[stringish? (define (->path x)
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(with-handlers ([exn:fail? (make-coercion-error-handler ->path pathish? x)])
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(if (url? x)
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(url->path x)
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(string->path (->string x)))))]))
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(define-generics+provide+safe urlish
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(any/c . -> . url?)
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(->url urlish)
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#:fast-defaults
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([url? (define ->url values)]
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[stringish? (define (->url x)
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(with-handlers ([exn:fail? (make-coercion-error-handler ->url urlish? x)])
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(string->url (->string x))))]))
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(define-generics+provide+safe complete-pathish
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(any/c . -> . complete-path?)
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(->complete-path complete-pathish)
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#:fast-defaults
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([(conjoin path? complete-path?)
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;; caution: plain `complete-path?` returns #t for path strings,
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;; so also check `path?`
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(define ->complete-path values)]
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[stringish? (define (->complete-path x)
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(with-handlers ([exn:fail? (make-coercion-error-handler ->complete-path complete-pathish? x)])
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(path->complete-path (->path x))))]))
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(define-generics+provide+safe listish
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(any/c . -> . list?)
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(->list listish)
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#:fast-defaults
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([list? (define ->list values)]
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[string? (define ->list list)]
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[vector? (define ->list vector->list)]
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[hash? (define ->list hash->list)]
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[integer? (define ->list list)]
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[sequence? (define ->list sequence->list)]
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[stream? (define ->list stream->list)]
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[(λ (x) #t) (define ->list list)]))
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(define-generics+provide+safe vectorish
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(any/c . -> . vector?)
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(->vector vectorish)
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#:fast-defaults
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([vector? (define ->vector values)]
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[listish? (define (->vector x)
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(with-handlers ([exn:fail? (make-coercion-error-handler ->vector vectorish? x)])
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(list->vector (->list x))))]))
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(define+provide+safe (->boolean x)
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(any/c . -> . boolean?)
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(and x #t)) |