;;;
;;; auxiliary hashtable utilities.  to be autoloaded.
;;;
;;;   Copyright (c) 2000-2014  Shiro Kawai  <shiro@acm.org>
;;;
;;;   Redistribution and use in source and binary forms, with or without
;;;   modification, are permitted provided that the following conditions
;;;   are met:
;;;
;;;   1. Redistributions of source code must retain the above copyright
;;;      notice, this list of conditions and the following disclaimer.
;;;
;;;   2. Redistributions in binary form must reproduce the above copyright
;;;      notice, this list of conditions and the following disclaimer in the
;;;      documentation and/or other materials provided with the distribution.
;;;
;;;   3. Neither the name of the authors nor the names of its contributors
;;;      may be used to endorse or promote products derived from this
;;;      software without specific prior written permission.
;;;
;;;   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;;;   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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;;;

(define-module gauche.hashutil
  (export hash-table hash-table-for-each hash-table-map hash-table-fold)
  )
(select-module gauche.hashutil)

(define (hash-table type . kvs)
  (rlet1 h (make-hash-table type)
    (for-each (^[kv] (hash-table-put! h (car kv) (cdr kv))) kvs)))

(define (hash-table-map hash proc)
  (check-arg hash-table? hash)
  (let ([eof (cons #f #f)]              ;marker
        [i   (%hash-table-iter hash)])
    (let loop ([r '()])
      (receive [k v] (i eof)
        (if (eq? k eof)
          r
          (loop (cons (proc k v) r)))))))

(define (hash-table-for-each hash proc)
  (check-arg hash-table? hash)
  (let ([eof (cons #f #f)]              ;marker
        [i (%hash-table-iter hash)])
    (let loop ()
      (receive [k v] (i eof)
        (unless (eq? k eof)
          (proc k v) (loop))))))

(define (hash-table-fold hash kons knil)
  (check-arg hash-table? hash)
  (let ([eof (cons #f #f)]              ;marker
        [i (%hash-table-iter hash)])
    (let loop ([r knil])
      (receive [k v] (i eof)
        (if (eq? k eof)
          r
          (loop (kons k v r)))))))

