#| Copyright 2024 Peter McGoron
 |
 | Licensed under the Apache License, Version 2.0 (the "License");
 | you may not use this file except in compliance with the License.
 | You may obtain a copy of the License at
 |
 |     http://www.apache.org/licenses/LICENSE-2.0
 |
 | Unless required by applicable law or agreed to in writing, software
 | distributed under the License is distributed on an "AS IS" BASIS,
 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 | See the License for the specific language governing permissions and
 | limitations under the License.
 |#

(cond-expand
 (chicken (import r7rs))
 (else))

(load "mcgoron.iterator.exceptions.sld")
(load "mcgoron.iterator.base.sld")
(load "mcgoron.iterator.string.sld")

(import (srfi 64) (mcgoron iterator string)
        (mcgoron iterator base))

(let* ((str "")
       (itr (string-iterator-start str)))
  (test-begin "empty string")
  (test-assert "iterator-at-start?" (iterator-at-start? itr))
  (test-assert "iterator-at-end?" (iterator-at-end? itr))
  (test-assert "iterator-advance 1" (not (iterator-advance itr 1)))
  (test-assert "iterator-advance -1" (not (iterator-advance itr -1)))
  (test-eqv "iterator->index" 0 (iterator->index itr))
  (test-assert "iterator=?" (iterator=? itr (string-iterator-end str)))
  (test-error "iterator-ref" #t (iterator-ref itr))
  (test-end "empty string"))

(let* ((str "a")
       (itr (string-iterator-start str))
       (itr-from-itr (string-iterator-start itr)))
  (test-begin "single character string")
  (test-assert "iterator-at-start?" (iterator-at-start? itr))
  (test-assert "iterator-at-end?" (not (iterator-at-end? itr)))
  (test-assert (iterator=? itr itr-from-itr))
  (test-eqv "iterator-ref 0" #\a (iterator-ref itr))
  (test-assert "iterator-advance start -1" (not (iterator-advance itr -1)))
  (let ((next-itr (iterator-advance itr 1)))
    (test-assert "iterator? advanced" (iterator? next-itr))
    (test-assert "iterator-at-end? advanced" (iterator-at-end? next-itr))
    (test-assert "iterator=? end advanced"
                 (iterator=? next-itr (string-iterator-end str)))
    (test-assert "iterator=? itr next-itr"
                 (not (iterator=? itr next-itr)))
    (test-assert "iterator<? itr next-itr"
                 (iterator<? itr next-itr))
    (test-assert "iterator=? itr previous"
                 (iterator=? itr (iterator-advance next-itr -1)))
    (test-eqv "iterator->index next-itr" 1
              (iterator->index next-itr))
    (test-error "iterator-ref next-itr"
                #t (iterator-ref next-itr)))
  (test-end "single character string"))