Added method Lower()

5 files changed, 244 insertions, 1 deletions

diff --git a/StringTools/StringTools/StringTools.cpp b/StringTools/StringTools/StringTools.cpp
index 728506a..7e26c5c 100644
--- a/StringTools/StringTools/StringTools.cpp
+++ b/StringTools/StringTools/StringTools.cpp
@@ -59,4 +59,40 @@ std::string StringTools::Replace(const std::string& str, const std::string& find
     ss << subst;

 

     return Replace(str, find, ss.str());

-}
\ No newline at end of file
+}

+

+std::string StringTools::Lower(const std::string& str)

+{

+    std::stringstream ss;

+

+    for (std::size_t i = 0; i < str.size(); i++)

+    {

+        const char c = str[i];

+

+        // Quick-accept: regular letters

+        if ((c >= 'A') && (c <= 'Z'))

+            ss << (char)(c + 32);

+

+        // Damned umlautes:

+        else if (c == 'Ä') ss << 'ä';

+        else if (c == 'Á') ss << 'á';

+        else if (c == 'À') ss << 'à';

+        else if (c == 'Â') ss << 'â';

+        else if (c == 'É') ss << 'é';

+        else if (c == 'È') ss << 'è';

+        else if (c == 'Ê') ss << 'ê';

+        else if (c == 'Ü') ss << 'ü';

+        else if (c == 'Ú') ss << 'ú';

+        else if (c == 'Ù') ss << 'ù';

+        else if (c == 'Û') ss << 'û';

+        else if (c == 'Ö') ss << 'ö';

+        else if (c == 'Ó') ss << 'ó';

+        else if (c == 'Ò') ss << 'ò';

+        else if (c == 'Ô') ss << 'ô';

+

+        // Else: keep the character as is

+        else ss << c;

+    }

+

+    return ss.str();

+}

diff --git a/StringTools/StringTools/StringTools.h b/StringTools/StringTools/StringTools.h
index 730fa3e..39e512f 100644
--- a/StringTools/StringTools/StringTools.h
+++ b/StringTools/StringTools/StringTools.h
@@ -17,6 +17,9 @@ public:
 	//! Will replace every occurence of `find` in `str` by `subst`.

 	static std::string Replace(const std::string& str, const std::string& find, const char subst);

 

+	//! Will make a string all-lowercase. Only works with latin and german umlautes, plus some extras.

+	static std::string Lower(const std::string& str);

+

 private:

 	// No instanciation! >:(

 	StringTools();

diff --git a/StringTools/Test/Lower.cpp b/StringTools/Test/Lower.cpp
new file mode 100644
index 0000000..c45af68
--- /dev/null
+++ b/StringTools/Test/Lower.cpp
@@ -0,0 +1,200 @@
+#include "CppUnitTest.h"

+#include "../StringTools/StringTools.h"

+

+using namespace Microsoft::VisualStudio::CppUnitTestFramework;

+

+namespace _StringTools

+{

+	TEST_CLASS(_Lower)

+	{

+	public:

+

+		// Tests that lowering an empty string returns an empty string

+		TEST_METHOD(EmptyString)

+		{

+			// Setup

+			const std::string in = "";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("", out.c_str());

+			return;

+		}

+

+		// Tests that lowering a string without any letters returns an itself

+		TEST_METHOD(Symbols)

+		{

+			// Setup

+			const std::string in = "66! _-\n*";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("66! _-\n*", out.c_str());

+			return;

+		}

+

+		// Tests that lowering a string of lowercase letters returns itself

+		TEST_METHOD(AlreadyLowered)

+		{

+			// Setup

+			const std::string in = "ughareyouserious";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("ughareyouserious", out.c_str());

+			return;

+		}

+

+		// Tests that lowering a string of uppercase letters returns the lowercase version

+		TEST_METHOD(Uppercase)

+		{

+			// Setup

+			const std::string in = "UGHAREYOUSERIOUS";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("ughareyouserious", out.c_str());

+			return;

+		}

+

+		// Tests that lowering a string of uppercase, lowercase letters and symbols returns the lowercase version

+		TEST_METHOD(Mixed)

+		{

+			// Setup

+			const std::string in = "Ugh, Are You Serious?! DON'T DO THAT!!!";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("ugh, are you serious?! don't do that!!!", out.c_str());

+			return;

+		}

+

+		// Tests that lowering already lowered umlautes returns itself

+		TEST_METHOD(Umlautes_already_lower_a)

+		{

+			// Setup

+			const std::string in = "äáàâ";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("äáàâ", out.c_str());

+		}

+

+		// Tests that lowering uppercase umlautes returns the lowered umlautes

+		TEST_METHOD(Umlautes_upper_a)

+		{

+			// Setup

+			const std::string in = "ÄÁÀÂ";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("äáàâ", out.c_str());

+		}

+

+		// Tests that lowering already lowered umlautes returns itself

+		TEST_METHOD(Umlautes_already_lower_e)

+		{

+			// Setup

+			const std::string in = "éèê";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("éèê", out.c_str());

+		}

+

+		// Tests that lowering uppercase umlautes returns the lowered umlautes

+		TEST_METHOD(Umlautes_upper_e)

+		{

+			// Setup

+			const std::string in = "ÉÈÊ";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("éèê", out.c_str());

+		}

+

+		// Tests that lowering already lowered umlautes returns itself

+		TEST_METHOD(Umlautes_already_lower_u)

+		{

+			// Setup

+			const std::string in = "üúùû";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("üúùû", out.c_str());

+		}

+

+		// Tests that lowering uppercase umlautes returns the lowered umlautes

+		TEST_METHOD(Umlautes_upper_u)

+		{

+			// Setup

+			const std::string in = "ÜÚÙÛ";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("üúùû", out.c_str());

+		}

+

+		// Tests that lowering already lowered umlautes returns itself

+		TEST_METHOD(Umlautes_already_lower_o)

+		{

+			// Setup

+			const std::string in = "öóòô";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("öóòô", out.c_str());

+		}

+

+		// Tests that lowering uppercase umlautes returns the lowered umlautes

+		TEST_METHOD(Umlautes_upper_o)

+		{

+			// Setup

+			const std::string in = "ÖÓÒÔ";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("öóòô", out.c_str());

+		}

+

+		// Tests that lowering a string of uppercase, lowercase letters and symbols returns the lowercase version, even with umlauts

+		TEST_METHOD(Mixed_with_umlautes)

+		{

+			// Setup

+			const std::string in = "Ügh, Àrä Yóü Seriöûs?! DÓN'T DÒ THÄT!!!";

+

+			// Exercise

+			const std::string out = StringTools::Lower(in);

+

+			// Verify

+			Assert::AreEqual("ügh, àrä yóü seriöûs?! dón't dò thät!!!", out.c_str());

+			return;

+		}

+	};

+}

diff --git a/StringTools/Test/Test.vcxproj b/StringTools/Test/Test.vcxproj
index 51fba2c..59e804a 100644
--- a/StringTools/Test/Test.vcxproj
+++ b/StringTools/Test/Test.vcxproj
@@ -162,6 +162,7 @@
     </ProjectReference>

   </ItemGroup>

   <ItemGroup>

+    <ClCompile Include="Lower.cpp" />

     <ClCompile Include="Replace_Char.cpp" />

     <ClCompile Include="Replace_String.cpp" />

   </ItemGroup>

diff --git a/StringTools/Test/Test.vcxproj.filters b/StringTools/Test/Test.vcxproj.filters
index e159865..c10488e 100644
--- a/StringTools/Test/Test.vcxproj.filters
+++ b/StringTools/Test/Test.vcxproj.filters
@@ -21,5 +21,8 @@
     <ClCompile Include="Replace_String.cpp">

       <Filter>Quelldateien</Filter>

     </ClCompile>

+    <ClCompile Include="Lower.cpp">

+      <Filter>Quelldateien</Filter>

+    </ClCompile>

   </ItemGroup>

 </Project>
\ No newline at end of file