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(define-module (curth0)
#:use-module ((language tree-il) #:prefix tree-il:)
#:use-module ((srfi srfi-1) #:prefix s1:)
#:use-module ((srfi srfi-64) #:prefix t:)
#:export (->
->>))
(define (expand l)
(tree-il:tree-il->scheme (macroexpand l)))
(define-syntax ->
(syntax-rules ()
((_) #f)
((_ x) x)
((_ x (f . (head ...))) (f x head ...))
((_ x f) (f x))
((_ x (f . (head ...)) rest ...) (-> (f x head ...) rest ...))
((_ x f rest ...) (-> (f x) rest ...))))
(define-syntax ->>
(syntax-rules ()
((_) #f)
((_ x) x)
((_ x (f ...)) (f ... x))
((_ x f) (f x))
((_ x (f ...) rest ...) (->> (f ... x) rest ...))
((_ x f rest ...) (->> (f x) rest ...))))
(define (test-thread-macro)
(t:test-group "-> and ->>"
(t:test-equal '#f (expand '(->)))
(t:test-equal '#f (expand '(->>)))
(t:test-equal '1 (expand '(-> 1)))
(t:test-equal '1 (expand '(->> 1)))
(t:test-equal '(f 1) (expand '(-> (f 1))))
(t:test-equal '(f 1) (expand '(->> (f 1))))
(t:test-equal '(f 1 2 3) (expand '(-> 1 (f 2 3))))
(t:test-equal '(f 2 3 1) (expand '(->> 1 (f 2 3))))
(t:test-equal '(f 1) (expand '(-> 1 f)))
(t:test-equal '(f 1) (expand '(->> 1 f)))
(t:test-equal '(f2 (f1 1)) (expand '(-> 1 f1 f2)))
(t:test-equal '(f2 (f1 1)) (expand '(->> 1 f1 f2)))
(t:test-equal '(f2 (f1 1)) (expand '(-> 1 (f1) f2)))
(t:test-equal '(f2 (f1 1)) (expand '(->> 1 (f1) f2)))
(t:test-equal '(f2 (f1 1)) (expand '(-> 1 f1 (f2))))
(t:test-equal '(f2 (f1 1)) (expand '(->> 1 f1 (f2))))
(t:test-equal '(f2 (f1 1)) (expand '(-> 1 (f1) (f2))))
(t:test-equal '(f2 (f1 1)) (expand '(->> 1 (f1) (f2))))
(t:test-equal '(f1 1 (f2)) (expand '(-> 1 (f1 (f2)))))
(t:test-equal '(f1 (f2) 1) (expand '(->> 1 (f1 (f2)))))
(t:test-equal '(f6 (f5 (f4 (f3 (f1 1 (f2)))) 0 1 2))
(expand '(-> 1 (f1 (f2)) f3 (f4) (f5 0 1 2) f6)))
(t:test-equal '(f6 (f5 0 1 2 (f4 (f3 (f1 (f2) 1)))))
(expand '(->> 1 (f1 (f2)) f3 (f4) (f5 0 1 2) f6)))))
(define consumable-chars
'(#\space #\tab))
(define (extract-single-line-indentation chars)
(s1:fold (lambda (curr acc)
(let* ((prev (s1:first acc))
(halted? (s1:second acc))
(n (s1:third acc))
(non-blank? (not (member curr consumable-chars)))
(changed? (and (not (null? prev))
(not (equal? curr prev)))))
(cond
(halted? acc)
(non-blank? (list prev #t n))
(changed? (list prev #t n))
(#:else (list curr #f (+ 1 n))))))
(list #nil #f 0)
chars))
(define (test-extract-single-line-indentation)
(t:test-group "extract-single-line-indentation"
(t:test-equal '(#nil #f 0)
(extract-single-line-indentation
'()))
(t:test-equal '(#nil #t 0)
(extract-single-line-indentation
'(#\a #\b #\c)))
(t:test-equal '(#\space #t 1)
(extract-single-line-indentation
'(#\space #\b #\c)))
(t:test-equal '(#\space #t 5)
(extract-single-line-indentation
'(#\space #\space #\space #\space #\space #\b #\c)))
(t:test-equal '(#\space #f 5)
(extract-single-line-indentation
'(#\space #\space #\space #\space #\space)))
(t:test-equal '(#\space #f 1)
(extract-single-line-indentation
'(#\space)))
(t:test-equal '(#\tab #t 3)
(extract-single-line-indentation
'(#\tab #\tab #\tab #\b #\c)))
(t:test-equal '(#\tab #f 3)
(extract-single-line-indentation
'(#\tab #\tab #\tab)))
(t:test-equal '(#\tab #f 1)
(extract-single-line-indentation
'(#\tab)))
(t:test-equal '(#\space #t 1)
(extract-single-line-indentation
'(#\space #\tab)))
(t:test-equal '(#\space #t 2)
(extract-single-line-indentation
'(#\space #\space #\tab #\space)))
(t:test-equal '(#\tab #t 3)
(extract-single-line-indentation
'(#\tab #\tab #\tab #\space)))
(t:test-equal '(#\tab #t 3)
(extract-single-line-indentation
'(#\tab #\tab #\tab #\a #\tab)))
(t:test-equal '(#\tab #t 3)
(extract-single-line-indentation
'(#\tab #\tab #\tab #\a #\space)))))
(define (extract-line-indentations lines)
(map (compose (lambda (triple)
(list (s1:first triple)
(s1:third triple)))
extract-single-line-indentation
string->list)
lines))
(define (test-extract-line-indentations)
(t:test-group "extract-line-indentations"
(t:test-equal '()
(extract-line-indentations
'()))
(t:test-equal '((#nil 0))
(extract-line-indentations
'("")))
(t:test-equal '((#nil 0) (#nil 0) (#nil 0))
(extract-line-indentations
'("" "" "")))
(t:test-equal '((#nil 0) (#nil 0) (#nil 0))
(extract-line-indentations
'("a" "b" "c")))
(t:test-equal '((#\space 1) (#\space 2) (#\space 3))
(extract-line-indentations
'(" " " " " ")))))
(define (maximum-indentation lines)
(let* ((line-indentations (extract-line-indentations lines))
(chars (map s1:first line-indentations))
(different-indents? (not (= 1 (length (s1:delete-duplicates chars))))))
(if different-indents?
0
(apply min (map s1:third line-indentations)))))
(define (trim-indentation s)
(let* ((lines (string-split s #\newline))
(trim-n (maximum-indentation
(filter (lambda (s) (not (equal? "" s)))
lines))))
(string-join
(map (lambda (line)
(if (equal? "" line)
line
(substring line trim-n)))
lines)
"\n")))
(define (non-quote-chars? chars)
(let ((non-quote-chars (filter (lambda (c)
(not (equal? #\" c)))
chars)))
(if (< 0 (length non-quote-chars))
non-quote-chars
#f)))
(define (multiline-string-reader _char port)
"FIXME:
- remove the need to indent the last line with the rest of the content.
How does Perl, Ruby, Python, sh do it?"
(let ((multiline? #f)
(chars '()))
(do ((curr (read-char port)
(read-char port)))
((equal? #\newline curr))
(set! chars (cons curr chars)))
(when (equal? #\- (car chars))
(set! multiline? #t)
(set! chars (cdr chars)))
(let ((non-quote-chars (non-quote-chars? chars)))
(when non-quote-chars
(error
(format
#f
"Invalid characters at the beginning of the multiline reader: ~s"
(reverse non-quote-chars)))))
(let* ((quote-count (+ 1 (length chars)))
(quote-n 0)
(output '()))
(while #t
(let ((curr (read-char port)))
(when (eof-object? curr)
(error "EOF while reading #\"\"# multiline string"))
(set! output (cons curr output))
(set! quote-n
(cond
((and (>= quote-n quote-count)
(equal? #\# curr))
(break))
((equal? #\" curr) (+ 1 quote-n))
(#:else 0)))))
(let ((s (list->string
(reverse
(s1:drop output (+ 1 quote-count))))))
(if multiline?
(trim-indentation s)
s)))))
(read-hash-extend #\" multiline-string-reader)
(define test-fns
(list
test-thread-macro
test-extract-single-line-indentation
test-extract-line-indentations))
(define (unit-tests)
(t:test-begin "curth0-tests")
(for-each (lambda (fn) (fn)) test-fns)
(let ((n-fail (t:test-runner-fail-count (t:test-runner-get))))
(t:test-end)
n-fail))
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