string iterator

1 files changed, 63 insertions, 0 deletions

diff --git a/test-string-iterator.scm b/test-string-iterator.scm
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+#| 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.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"))
+