Start UI core layout value tests

src/ui_core/layout_value.cpp

@@ -0,0 +1,57 @@
+#include "ui_core/layout_value.h"
+
+#include "foundation/parse.h"
+
+namespace pp::ui {
+
+pp::foundation::Result<LayoutLength> parse_layout_length(std::string_view text) noexcept
+{
+    if (text == "auto") {
+        return pp::foundation::Result<LayoutLength>::success(
+            LayoutLength { .kind = LayoutLengthKind::auto_value, .value = 0 });
+    }
+
+    if (text.empty()) {
+        return pp::foundation::Result<LayoutLength>::failure(
+            pp::foundation::Status::invalid_argument("layout length must not be empty"));
+    }
+
+    if (text.back() == '%') {
+        const auto number = pp::foundation::parse_u32(text.substr(0, text.size() - 1U));
+        if (!number) {
+            return pp::foundation::Result<LayoutLength>::failure(number.status());
+        }
+
+        if (number.value() > 100U) {
+            return pp::foundation::Result<LayoutLength>::failure(
+                pp::foundation::Status::out_of_range("layout percent must be between 0 and 100"));
+        }
+
+        return pp::foundation::Result<LayoutLength>::success(
+            LayoutLength { .kind = LayoutLengthKind::percent, .value = number.value() });
+    }
+
+    const auto pixels = pp::foundation::parse_u32(text);
+    if (!pixels) {
+        return pp::foundation::Result<LayoutLength>::failure(pixels.status());
+    }
+
+    return pp::foundation::Result<LayoutLength>::success(
+        LayoutLength { .kind = LayoutLengthKind::pixels, .value = pixels.value() });
+}
+
+const char* layout_length_kind_name(LayoutLengthKind kind) noexcept
+{
+    switch (kind) {
+    case LayoutLengthKind::auto_value:
+        return "auto";
+    case LayoutLengthKind::pixels:
+        return "pixels";
+    case LayoutLengthKind::percent:
+        return "percent";
+    }
+
+    return "unknown";
+}
+
+}

src/ui_core/layout_value.h

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+#pragma once
+
+#include "foundation/result.h"
+
+#include <cstdint>
+#include <string_view>
+
+namespace pp::ui {
+
+enum class LayoutLengthKind : std::uint8_t {
+    auto_value,
+    pixels,
+    percent,
+};
+
+struct LayoutLength {
+    LayoutLengthKind kind = LayoutLengthKind::auto_value;
+    std::uint32_t value = 0;
+};
+
+[[nodiscard]] pp::foundation::Result<LayoutLength> parse_layout_length(std::string_view text) noexcept;
+[[nodiscard]] const char* layout_length_kind_name(LayoutLengthKind kind) noexcept;
+
+}