diff options
Diffstat (limited to 'mew.scm')
| -rw-r--r-- | mew.scm | 51 |
1 files changed, 36 insertions, 15 deletions
diff --git a/mew.scm b/mew.scm index 524c10c..5828f36 100644 --- a/mew.scm +++ b/mew.scm @@ -7,7 +7,8 @@ empty? eof esc fail fin final for fun* gconcatenate gen generator-xfold generic-for-each genumerate get - gfix giterate gmatch gpick group-by-accumulator gslice-when gsplit gwindow + gfix giterate gmatch gpick group-by-accumulator gslice-when + gsplit gsplit-on gwindow imp inc inject into juxt keys @@ -534,6 +535,26 @@ (set! window (append (cdr window) (list next))) window))))))) + (define (gsplit-on pred gen) + (let ((slice '()) + (this #f)) + (lambda () + (if (eof-object? this) + this + (let loop () + (set! this (gen)) + (if (eof-object? this) + (if (null? slice) + (eof) + (reverse slice)) + (if (pred this) + (let ((finished-slice (reverse slice))) + (set! slice '()) + finished-slice) + (begin + (set! slice (cons this slice)) + (loop))))))))) + (define (gslice-when pred gen) (let ((slice #f) (prev #f) @@ -545,20 +566,20 @@ (set! this (eof))) (set! slice (list prev))) (if (eof-object? this) - this - (let loop () - (set! this (gen)) - (if (eof-object? this) - (reverse slice) - (if (pred prev this) - (let ((finished-slice (reverse slice))) - (set! slice (list this)) - (set! prev this) - finished-slice) - (begin - (set! slice (cons this slice)) - (set! prev this) - (loop))))))))) + this + (let loop () + (set! this (gen)) + (if (eof-object? this) + (reverse slice) + (if (pred prev this) + (let ((finished-slice (reverse slice))) + (set! slice (list this)) + (set! prev this) + finished-slice) + (begin + (set! slice (cons this slice)) + (set! prev this) + (loop))))))))) (define (genumerate gen) (let ((n -1)) |