diff options
Diffstat (limited to 'modules/language/python/string.scm')
| -rw-r--r-- | modules/language/python/string.scm | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/modules/language/python/string.scm b/modules/language/python/string.scm index 589f1e7..d8f4da7 100644 --- a/modules/language/python/string.scm +++ b/modules/language/python/string.scm @@ -5,6 +5,7 @@ #:use-module (ice-9 match) #:use-module (language python list) #:use-module (language python exceptions) + #:use-module (language python for) #:use-module (parser stis-parser) #:export (py-format py-capitalize py-center py-endswith py-expandtabs py-find py-rfind @@ -517,6 +518,52 @@ (define-method (equal? x (o <py-string>)) (equal? (slot-ref o 'str) x)) +(define-class <string-iter> (<py-string>) str i d) + +(define-method (write (o <string-iter>) . l) + (define port (if (null? l) #t (car l))) + (for ((x : o)) ((l '())) + (cons (string-ref x 0) l) + #:final + (format port "iter(~s)" (list->string (reverse l))))) + +(define-method (wrap-in (o <string-iter> )) + (let ((out (make <string-iter>))) + (slot-set! out 'str (slot-ref o 'str)) + (slot-set! out 'i (slot-ref o 'i)) + (slot-set! out 'd (slot-ref o 'd)) + out)) + +(define-method (wrap-in (s <string>)) + (let ((out (make <string-iter>))) + (slot-set! out 'str s) + (slot-set! out 'i 0) + (slot-set! out 'd 1) + out)) + +(define-method (py-reversed (s <string>)) + (let ((out (make <string-iter>))) + (slot-set! out 'str s) + (slot-set! out 'i (- (string-length s) 1)) + (slot-set! out 'd -1) + out)) + +(define-method (next (o <string-iter>)) + (let ((i (slot-ref o 'i )) + (d (slot-ref o 'd)) + (str (slot-ref o 'str))) + (if (> d 0) + (if (< i (string-length str)) + (let ((ret (string-ref str i))) + (slot-set! o 'i (+ i d)) + (list->string (list ret))) + (throw StopIteration)) + (if (>= i 0) + (let ((ret (string-ref str i))) + (slot-set! o 'i (+ i d)) + (list->string (list ret))) + (throw StopIteration))))) + (define (pystring-listing) (let ((l (to-pylist (map symbol->string |