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main.rkt
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#lang racket/base
;;;; Casemate
;;;;
;;;; A utility for converting strings, symbols and byte-strings to various
;;;; popular case-styles. Modeled after the excellent Clojure library
;;;; camel-snake-kebab (https://github.com/clj-commons/camel-snake-kebab).
;;;;
;;;; Copyright (C) 2019 Johan Persson <[email protected]>
;;;;
;;;; This program is free software: you can redistribute it and/or modify
;;;; it under the terms of the GNU Lesser General Public License as
;;;; published by the Free Software Foundation, either version 3 of the
;;;; License, or (at your option) any later version.
;;;;
;;;; This program is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;;; GNU Lesser General Public License for more details.
;;;;
;;;; You should have received copies of the GNU General Public License
;;;; and the GNU Lesser General Public License along with this program.
;;;; If not, see <https://www.gnu.org/licenses/>.
;;;; Imports ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(require racket/list
racket/string
racket/bytes
racket/function
racket/contract)
(require srfi/26) ;; For the handy cut-function
;;;; Constants ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; List of special words in HTTP headers.
;;; Made into an association list for quick lookup.
(define http-header-special-words
(map (lambda (component)
(cons (string-downcase component) component))
'("MD5"
"HTTP2"
"TE"
"DNT"
"ATT"
"UIDH"
"XSRF"
"CSRFToken"
"ETag"
"P3P"
"WWW"
"CSP"
"ID"
"UA"
"XSS"
"SSL"
"HTTP"
"HTTPS"
"IM"
"WAP")))
;;;; Utility functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Splits a string on lower-case/upper-case character-pairs without
;;; consuming them.
(define (string-split-by-case str)
(let ([components null]
[buffer null])
(for ([char (string->list str)])
(when (and (not (null? buffer))
(char-lower-case? (car buffer))
(char-upper-case? char))
(set! components (cons (reverse buffer) components))
(set! buffer null))
(set! buffer (cons char buffer)))
(reverse (map list->string (cons (reverse buffer) components)))))
;;; Applies a list of splitter-functions to a string.
(define (string-split/functions str [splitters (list string-split)])
(define (runner strs splitters)
(if (null? splitters)
strs
(runner (flatten (map (car splitters) strs)) (cdr splitters))))
(runner (list str) splitters))
;;;; Core functionality ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Splits a string with common separators, casing and whitespace.
(define (split str)
(string-split/functions str (list string-split
(cut string-split <> "-")
(cut string-split <> "_")
string-split-by-case)))
;;; Joins a list of string components with a given separator string.
;;; `car-case` is the case-function for the car of the components, and
;;; `cdr-case` what is used for the rest of the list.
(define (join car-case cdr-case separator components)
(string-join (cons (car-case (car components))
(map cdr-case (cdr components)))
separator))
;;; HTTP header case converter.
(define (http-case str)
(let ([special (assoc (string-downcase str) http-header-special-words)])
(if (eq? special #f)
(string-titlecase str)
(cdr special))))
;;; Converts symbols and byte-strings to strings and back.
;;; Throws an exception if the given data is nonsense.
(define (->string-> thing-applier thing)
(cond [(symbol? thing)
((compose string->symbol thing-applier symbol->string) thing)]
[(bytes? thing)
((compose string->bytes/utf-8 thing-applier bytes->string/utf-8) thing)]
[(string? thing) (thing-applier thing)]
[else
(error "it makes no sense to case convert for the given data")]))
;;; Maker for a converter function
(define (make-converter car-case cdr-case separator)
(curry ->string-> (compose (curry join car-case cdr-case separator) split)))
;;; Converter functions
(define ->PascalCase (make-converter string-titlecase string-titlecase "" ))
(define ->Camel_Snake_Case (make-converter string-titlecase string-titlecase "_"))
(define ->camelCase (make-converter string-downcase string-titlecase "" ))
(define ->SCREAMING_SNAKE_CASE (make-converter string-upcase string-upcase "_"))
(define ->snake_case (make-converter string-downcase string-downcase "_"))
(define ->kebab-case (make-converter string-downcase string-downcase "-"))
(define ->SCREAMING-KEBAB-CASE (make-converter string-upcase string-upcase "-"))
(define ->HTTP-Case (make-converter http-case http-case "-"))
;;;; Exports ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define converter/c (-> (or/c symbol? string? bytes?) any/c))
(provide (contract-out
[->PascalCase converter/c]
[->Camel_Snake_Case converter/c]
[->camelCase converter/c]
[->SCREAMING_SNAKE_CASE converter/c]
[->snake_case converter/c]
[->kebab-case converter/c]
[->SCREAMING-KEBAB-CASE converter/c]
[->HTTP-Case converter/c]))
;;;; Tests ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(module+ test
(require rackunit)
(test-case
"Procedure: string-split-by-case"
(check-equal? (string-split-by-case "aB")
'("a" "B")
"should split in the boundary between 'a' and 'B'")
(check-equal? (string-split-by-case "AB")
'("AB")
"should not split the string")
(check-equal? (string-split-by-case "Ab")
'("Ab")
"should not split the string")
(check-equal? (string-split-by-case "ab")
'("ab")
"should not split the string"))
(test-case
"Procedure: string-split/functions"
(check-equal? (string-split/functions "a:b/c" (list (cut string-split <> "/")
(cut string-split <> ":")))
'("a" "b" "c")
"should split the string with the supplied splitters")
(check-equal? (string-split/functions "a b" null)
'("a b")
"should not split the string if no splitter functions are supplied"))
(test-case
"Procedure: split"
(check-equal? (split "a-bC_d e")
'("a" "b" "C" "d" "e")
"should split a string with the common separators, including whitespace"))
(test-case
"Procedure: join"
(check-equal? (join string-titlecase string-upcase "beep" '("FOO" "bar" "Thud"))
"FoobeepBARbeepTHUD"
"should join string components with the given first-component transform, rest-component transform and separator string"))
(test-case
"Procedure: ->string->"
(check-equal? (->string-> identity 'foo)
'foo
"should convert symbol to string and back")
(check-equal? (->string-> identity "foo")
"foo"
"should convert accept string as is")
(check-equal? (->string-> identity #"foo")
#"foo"
"should convert byte string to string and back")
(check-exn exn:fail? (lambda () (->string-> identity 123))
"should fail when given nonsense data"))
(test-case
"Procedure: http-case"
(check-equal? (http-case "Http")
"HTTP"
"should return upper-cased string for a special word")
(check-equal? (http-case "foo")
"Foo"
"should return title-cased string for an ordinary word"))
(test-case
"Check that each converter returns the expected result for a given string"
(define test-string "fooBar-thud_grunt beepHTTP")
(check-equal? (->PascalCase test-string)
"FooBarThudGruntBeepHttp")
(check-equal? (->Camel_Snake_Case test-string)
"Foo_Bar_Thud_Grunt_Beep_Http")
(check-equal? (->camelCase test-string)
"fooBarThudGruntBeepHttp")
(check-equal? (->SCREAMING_SNAKE_CASE test-string)
"FOO_BAR_THUD_GRUNT_BEEP_HTTP")
(check-equal? (->snake_case test-string)
"foo_bar_thud_grunt_beep_http")
(check-equal? (->kebab-case test-string)
"foo-bar-thud-grunt-beep-http")
(check-equal? (->SCREAMING-KEBAB-CASE test-string)
"FOO-BAR-THUD-GRUNT-BEEP-HTTP")
(check-equal? (->HTTP-Case test-string)
"Foo-Bar-Thud-Grunt-Beep-HTTP"))
(test-case
"Check that each converter returns the expected result for a given symbol"
(define test-symbol '|fooBar-thud_grunt beepHTTP|)
(check-equal? (->PascalCase test-symbol)
'FooBarThudGruntBeepHttp)
(check-equal? (->Camel_Snake_Case test-symbol)
'Foo_Bar_Thud_Grunt_Beep_Http)
(check-equal? (->camelCase test-symbol)
'fooBarThudGruntBeepHttp)
(check-equal? (->SCREAMING_SNAKE_CASE test-symbol)
'FOO_BAR_THUD_GRUNT_BEEP_HTTP)
(check-equal? (->snake_case test-symbol)
'foo_bar_thud_grunt_beep_http)
(check-equal? (->kebab-case test-symbol)
'foo-bar-thud-grunt-beep-http)
(check-equal? (->SCREAMING-KEBAB-CASE test-symbol)
'FOO-BAR-THUD-GRUNT-BEEP-HTTP)
(check-equal? (->HTTP-Case test-symbol)
'Foo-Bar-Thud-Grunt-Beep-HTTP))
(test-case
"Check that each converter returns the expected result for a given byte string"
(define test-byte-string #"fooBar-thud_grunt beepHTTP")
(check-equal? (->PascalCase test-byte-string)
#"FooBarThudGruntBeepHttp")
(check-equal? (->Camel_Snake_Case test-byte-string)
#"Foo_Bar_Thud_Grunt_Beep_Http")
(check-equal? (->camelCase test-byte-string)
#"fooBarThudGruntBeepHttp")
(check-equal? (->SCREAMING_SNAKE_CASE test-byte-string)
#"FOO_BAR_THUD_GRUNT_BEEP_HTTP")
(check-equal? (->snake_case test-byte-string)
#"foo_bar_thud_grunt_beep_http")
(check-equal? (->kebab-case test-byte-string)
#"foo-bar-thud-grunt-beep-http")
(check-equal? (->SCREAMING-KEBAB-CASE test-byte-string)
#"FOO-BAR-THUD-GRUNT-BEEP-HTTP")
(check-equal? (->HTTP-Case test-byte-string)
#"Foo-Bar-Thud-Grunt-Beep-HTTP")))
;; ❦ ❦ ❦ ;;
;; ❦ ❦ ;;
;; ❦ ;;