Added support for pasting of monetary values (#176)

Fixes #52

Description of the changes:
Added support for pasting of prefix currency symbols supported by the Windows keyboard.
yen or yuan (¥)
unspecified currency sign (¤)
Ghanaian cedi (₵)
dollar or peso ($)
colón (₡)
won (₩)
shekel (₪)
naira (₦)
Indian rupee (₹)
pound (£)
euro (€)

How changes were validated:
Manually tested each prefix currency symbol supported by the Windows keyboard and ran unit tests.

src/CalcViewModel/Common/CopyPasteManager.cpp

@@ -139,7 +139,7 @@ String^ CopyPasteManager::ValidatePasteExpression(String^ pastedText, ViewMode m
     String^ englishString = LocalizationSettings::GetInstance().GetEnglishValueFromLocalizedDigits(pasteExpression);
 
     // Removing the spaces, comma separator from the pasteExpression to allow pasting of expressions like 1  +     2+1,333
-    pasteExpression = Utils::RemoveUnwantedCharsFromWstring(englishString->Data());
+    pasteExpression = RemoveUnwantedCharsFromWstring(englishString->Data());
 
     // If the last character is an = sign, remove it from the pasteExpression to allow evaluating the result on paste.
     if (!pasteExpression.empty() && pasteExpression.back() == L'=')
@@ -567,3 +567,21 @@ size_t CopyPasteManager::ProgrammerOperandLength(const wstring& operand, int num
 
     return len;
 }
+
+// return wstring after removing characters like space, comma, double quotes, and monetary prefix currency symbols supported by the Windows keyboard:
+// yen or yuan(¥) - 165
+// unspecified currency sign(¤) - 164
+// Ghanaian cedi(₵) - 8373
+// dollar or peso($) - 36
+// colón(₡) - 8353
+// won(₩) - 8361
+// shekel(₪) - 8362
+// naira(₦) - 8358
+// Indian rupee(₹) - 8377
+// pound(£) - 163
+// euro(€) - 8364
+wstring CopyPasteManager::RemoveUnwantedCharsFromWstring(const wstring& input)
+{
+    wchar_t unWantedChars[] = { L' ', L',', L'"', 165, 164, 8373, 36, 8353, 8361, 8362, 8358, 8377, 163, 8364, 8234, 8235, 8236, 8237 };
+    return Utils::RemoveUnwantedCharsFromWstring(input, unWantedChars, 18);
+}

src/CalcViewModel/Common/CopyPasteManager.h

@@ -58,6 +58,7 @@ namespace CalculatorApp
         static size_t OperandLength(std::wstring operand, CalculatorApp::Common::ViewMode mode, CalculatorApp::Common::CategoryGroupType modeType, int programmerNumberBase = -1);
         static size_t StandardScientificOperandLength(std::wstring operand);
         static size_t ProgrammerOperandLength(const std::wstring& operand, int numberBase);
+        static std::wstring RemoveUnwantedCharsFromWstring(const std::wstring& input);
 
         static constexpr size_t MaxStandardOperandLength = 16;
         static constexpr size_t MaxScientificOperandLength = 32;

src/CalcViewModel/Common/Utils.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 //
@@ -86,14 +86,7 @@ bool Utils::IsLastCharacterTarget(_In_ wstring const &input, _In_ wchar_t target
     return !input.empty() && input.back() == target;
 }
 
-// Returns wstring after removing characters like space, comma, and double quotes
+// Return wstring after removing characters specified by unwantedChars array
-wstring Utils::RemoveUnwantedCharsFromWstring(wstring input)
-{
-    wchar_t unWantedChars[] = { L' ', L',', L'"', 8234, 8235, 8236, 8237 };
-    return RemoveUnwantedCharsFromWstring(input, unWantedChars, 6);
-}
-
-// Returns wstring after removing characters specified by unwantedChars array
 wstring Utils::RemoveUnwantedCharsFromWstring(wstring input, wchar_t* unwantedChars, unsigned int size)
 {
     for (unsigned int i = 0; i < size; ++i)

src/CalcViewModel/Common/Utils.h

@@ -280,7 +280,6 @@ namespace Utils
     Platform::String^ GetStringValue(Platform::String^ input);
     bool IsLastCharacterTarget(std::wstring const &input, wchar_t target);
     std::wstring RemoveUnwantedCharsFromWstring(std::wstring inputString, wchar_t* unwantedChars, unsigned int size);
-    std::wstring RemoveUnwantedCharsFromWstring(std::wstring input);
     double GetDoubleFromWstring(std::wstring input);
     int GetWindowId();
     void RunOnUIThreadNonblocking(std::function<void()>&& function, _In_ Windows::UI::Core::CoreDispatcher^ currentDispatcher);

src/CalculatorUnitTests/CopyPasteManagerTest.cpp

@@ -193,6 +193,33 @@ namespace CalculatorUnitTests
             VERIFY_ARE_EQUAL(m_CopyPasteManager.SanitizeOperand(L"______1234___"), L"1234");
         };
 
+        // Using unicode literals here until the encoding issues get figured out
+        TEST_METHOD(ValidatePrefixCurrencySymbols)
+        {
+            // ¥5
+            VERIFY_ARE_EQUAL(m_CopyPasteManager.RemoveUnwantedCharsFromWstring(L"\u00A5\u0035"), L"5");
+            // ¤5
+            VERIFY_ARE_EQUAL(m_CopyPasteManager.RemoveUnwantedCharsFromWstring(L"\u00A4\u0035"), L"5");
+            // ₵5
+            VERIFY_ARE_EQUAL(m_CopyPasteManager.RemoveUnwantedCharsFromWstring(L"\u20B5\u0035"), L"5");
+            // $5
+            VERIFY_ARE_EQUAL(m_CopyPasteManager.RemoveUnwantedCharsFromWstring(L"\u0024\u0035"), L"5");
+            // ₡5
+            VERIFY_ARE_EQUAL(m_CopyPasteManager.RemoveUnwantedCharsFromWstring(L"\u20A1\u0035"), L"5");
+            // ₩5
+            VERIFY_ARE_EQUAL(m_CopyPasteManager.RemoveUnwantedCharsFromWstring(L"\u20A9\u0035"), L"5");
+            // ₪5
+            VERIFY_ARE_EQUAL(m_CopyPasteManager.RemoveUnwantedCharsFromWstring(L"\u20AA\u0035"), L"5");
+            // ₦5
+            VERIFY_ARE_EQUAL(m_CopyPasteManager.RemoveUnwantedCharsFromWstring(L"\u20A6\u0035"), L"5");
+            // ₹5
+            VERIFY_ARE_EQUAL(m_CopyPasteManager.RemoveUnwantedCharsFromWstring(L"\u20B9\u0035"), L"5");
+            // £5
+            VERIFY_ARE_EQUAL(m_CopyPasteManager.RemoveUnwantedCharsFromWstring(L"\u00A3\u0035"), L"5");
+            // €5
+            VERIFY_ARE_EQUAL(m_CopyPasteManager.RemoveUnwantedCharsFromWstring(L"\u20AC\u0035"), L"5");
+        };
+
         TEST_METHOD(ValidateTryOperandToULL)
         {
             unsigned long long int result = 0;