Separate string view, implement string appending semantics.

1 files changed, 101 insertions, 0 deletions

diff --git a/include/fud_string_view.hpp b/include/fud_string_view.hpp
new file mode 100644
index 0000000..4796003
--- /dev/null
+++ b/include/fud_string_view.hpp
@@ -0,0 +1,101 @@
+/*
+ * 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.
+ */
+
+
+#ifndef FUD_STRING_VIEW_HPP
+#define FUD_STRING_VIEW_HPP
+
+#include "fud_status.hpp"
+#include "fud_utf8.hpp"
+
+namespace fud {
+
+class String;
+
+class StringView {
+  public:
+    constexpr StringView() noexcept = default;
+    constexpr StringView(const StringView& rhs) noexcept = default;
+    constexpr StringView(StringView&& rhs) noexcept = default;
+    constexpr ~StringView() noexcept = default;
+    constexpr StringView& operator=(const StringView& rhs) = default;
+    constexpr StringView& operator=(StringView&& rhs) = default;
+
+    constexpr StringView(size_t strLen, const utf8* strData) : m_length(strLen), m_data{strData}
+    {
+    }
+
+    StringView(size_t strLen, const char* strData) :
+        m_length(strLen),                              // line break
+        m_data{reinterpret_cast<const utf8*>(strData)} // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast)
+    {
+    }
+
+    explicit StringView(const String& fudString) noexcept;
+
+    [[nodiscard]] constexpr size_t length() const
+    {
+        return m_length;
+    }
+
+    [[nodiscard]] constexpr const utf8* data() const
+    {
+        return m_data;
+    }
+
+    [[nodiscard]] bool nullTerminated() const;
+
+    [[nodiscard]] bool utf8Valid() const;
+
+    Result<size_t, FudStatus> skipWhitespace();
+
+    Result<size_t, FudStatus> trimWhitespace();
+
+    FudStatus toUint8(uint8_t& number, uint8_t specifiedRadix, size_t& strLen) const;
+
+    FudStatus toUint16(uint16_t& number, uint8_t specifiedRadix, size_t& strLen) const;
+
+    FudStatus toUint32(uint32_t& number, uint8_t specifiedRadix, size_t& strLen) const;
+
+    FudStatus toUint64(uint64_t& number, uint8_t specifiedRadix, size_t& strLen) const;
+
+    FudStatus toInt8(int8_t& number, uint8_t specifiedRadix, size_t& strLen) const;
+
+    FudStatus toInt16(int16_t& number, uint8_t specifiedRadix, size_t& strLen) const;
+
+    FudStatus toInt32(int32_t& number, uint8_t specifiedRadix, size_t& strLen) const;
+
+    FudStatus toInt64(int64_t& number, uint8_t specifiedRadix, size_t& strLen) const;
+
+    FudStatus toFloat(float& number, size_t& strLen) const;
+
+    FudStatus toDouble(double& number, size_t& strLen) const;
+
+  private:
+    size_t m_length{0};
+    const utf8* m_data{nullptr};
+};
+
+FudStatus skipWhitespace(StringView& view, size_t& skipIndex);
+
+ssize_t cStringLength(const char* str);
+
+ssize_t cStringLength(const char* str, size_t maxLength);
+
+} // namespace fud
+
+#endif