Adding fprops::from_name

include/fprops/fprops.h

@@ -0,0 +1,17 @@
+// SPDX-FileCopyrightText: 2024 David Andrs <andrsd@gmail.com>
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include "SinglePhaseFluidProperties.h"
+#include <string>
+
+namespace fprops {
+
+/// Construct fluid properties from a fluid name
+///
+/// @param name Fluid name
+/// @return Fluid properties
+SinglePhaseFluidProperties * from_name(const std::string & name);
+
+} // namespace fprops

src/fprops.cpp

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+// SPDX-FileCopyrightText: 2024 David Andrs <andrsd@gmail.com>
+// SPDX-License-Identifier: MIT
+
+#include "fprops/fprops.h"
+#include "fprops/Air.h"
+#include "fprops/CarbonDioxide.h"
+#include "fprops/Helium.h"
+#include "fprops/Nitrogen.h"
+#include "fprops/Exception.h"
+
+namespace fprops {
+
+std::string
+to_lower(const std::string & name)
+{
+    std::string lower(name);
+    std::transform(lower.begin(), lower.end(), lower.begin(), ::tolower);
+    return lower;
+}
+
+SinglePhaseFluidProperties *
+from_name(const std::string & name)
+{
+    auto n = to_lower(name);
+    if (n == "air")
+        return new Air();
+    else if (n == "carbon_dioxide" || n == "co2")
+        return new CarbonDioxide();
+    else if (n == "helium" || n == "he")
+        return new Helium();
+    else if (n == "nitrogen" || n == "n2")
+        return new Nitrogen();
+    else
+        throw Exception("Unknown fluid name '{}'", name);
+}
+
+} // namespace fprops

test/src/fprops_test.cpp

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+#include "gmock/gmock.h"
+#include "fprops/fprops.h"
+#include "fprops/Air.h"
+#include "fprops/CarbonDioxide.h"
+#include "fprops/Helium.h"
+#include "fprops/Nitrogen.h"
+
+using namespace fprops;
+using namespace testing;
+
+TEST(FpropsTest, from_name)
+{
+    auto air = fprops::from_name("air");
+    EXPECT_THAT(dynamic_cast<Air *>(air), NotNull());
+
+    auto co2 = fprops::from_name("co2");
+    EXPECT_THAT(dynamic_cast<CarbonDioxide *>(co2), NotNull());
+
+    auto he = fprops::from_name("helium");
+    EXPECT_THAT(dynamic_cast<Helium *>(he), NotNull());
+
+    auto n2 = fprops::from_name("nitrogen");
+    EXPECT_THAT(dynamic_cast<Nitrogen *>(n2), NotNull());
+}