From 7da829d48f9059c83ab9cada2c850621e8bbd3f3 Mon Sep 17 00:00:00 2001
From: Dominick Allen <djallen@librehumanitas.org>
Date: Sun, 22 Sep 2024 12:41:28 -0500
Subject: Basics of library.

---
 source/fud_utf8_iterator.cpp | 55 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 source/fud_utf8_iterator.cpp

(limited to 'source/fud_utf8_iterator.cpp')

diff --git a/source/fud_utf8_iterator.cpp b/source/fud_utf8_iterator.cpp
new file mode 100644
index 0000000..4476050
--- /dev/null
+++ b/source/fud_utf8_iterator.cpp
@@ -0,0 +1,55 @@
+/*
+ * libfud
+ * Copyright 2024 Dominick Allen
+ *
+ * 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.
+ */
+
+#include "fud_utf8_iterator.hpp"
+
+namespace fud {
+
+std::optional<FudUtf8> Utf8Iterator::peek() const
+{
+    if (m_index >= m_view.length()) {
+        return std::nullopt;
+    }
+
+    auto utf8 = FudUtf8::fromStringView(m_view, m_index);
+
+    if (!utf8.valid()) {
+        return std::nullopt;
+    }
+
+    return utf8;
+}
+
+std::optional<FudUtf8> Utf8Iterator::next()
+{
+    if (m_index >= m_view.length()) {
+        m_index = m_view.length();
+        return std::nullopt;
+    }
+
+    auto utf8 = FudUtf8::fromStringView(m_view, m_index);
+
+    if (!utf8.valid()) {
+        m_index = m_view.length();
+        return std::nullopt;
+    }
+
+    m_index += utf8.size();
+    return utf8;
+}
+
+} // namespace fud
-- 
cgit v1.2.3