Remove OpenVanilla dependencies

This removes one overengineered method from BopomofoSyllable and
rewrites a helper using a simpler UTF-8 heuristics.

Also adds the CMake project file and a unit test suite.

Source/Engine/Mandarin/CMakeLists.txt

@@ -0,0 +1,31 @@
+cmake_minimum_required(VERSION 3.17)
+project(Mandarin)
+
+set(CMAKE_CXX_STANDARD 17)
+
+add_library(MandarinLib Mandarin.h Mandarin.cpp)
+
+# Let CMake fetch Google Test for us.
+# https://github.com/google/googletest/tree/main/googletest#incorporating-into-an-existing-cmake-project
+include(FetchContent)
+
+FetchContent_Declare(
+        googletest
+        # Specify the commit you depend on and update it regularly.
+        URL https://github.com/google/googletest/archive/609281088cfefc76f9d0ce82e1ff6c30cc3591e5.zip
+)
+# For Windows: Prevent overriding the parent project's compiler/linker settings
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
+# Test target declarations.
+add_executable(MandarinTest MandarinTest.cpp)
+target_link_libraries(MandarinTest gtest_main MandarinLib)
+include(GoogleTest)
+gtest_discover_tests(MandarinTest)
+
+add_custom_target(
+        runTest
+        COMMAND ${CMAKE_CURRENT_BINARY_DIR}/MandarinTest
+)
+add_dependencies(runTest MandarinTest)

Source/Engine/Mandarin/Mandarin.cpp

@@ -29,14 +29,9 @@
 #include <algorithm>
 #include "Mandarin.h"
 
-#include "OVUTF8Helper.h"
-#include "OVWildcard.h"
-
 namespace Formosa {
 namespace Mandarin {
     
-using namespace OpenVanilla;
-
 class PinyinParseHelper {
 public:
     static const bool ConsumePrefix(string &target, const string &prefix)
@@ -591,15 +586,43 @@ const BPMF BPMF::FromPHT(const string& str)
 const BPMF BPMF::FromComposedString(const string& str)
 {
     BPMF syllable;
-    vector<string> components = OVUTF8Helper::SplitStringByCodePoint(str);
+    auto iter = str.begin();
-    for (vector<string>::iterator iter = components.begin() ; iter != components.end() ; ++iter) {
+    while (iter != str.end()) {
+      // This is a naive implementation and we bail early at anything we don't recognize.
+      // A sound implementation would require to either use a trie for the Bopomofo character map
+      // or to split the input by codepoints. This suffices for now.
 
-		const map<string, BPMF::Component>& charToComp = BopomofoCharacterMap::SharedInstance().characterToComponent;
+      // Illegal.
-		map<string, BPMF::Component>::const_iterator result = charToComp.find(*iter);
+      if (!(*iter & 0x80)) {
-		if (result != charToComp.end())
+        break;
-        	syllable += BPMF((*result).second);
+      }
+
+      size_t utf8_length = -1;
+
+      // These are the code points for the tone markers.
+      if ((*iter & (0x80 | 0x40)) && !(*iter & 0x20)) {
+        utf8_length = 2;
+      } else if ((*iter & (0x80 | 0x40 | 0x20)) && !(*iter & 0x10)) {
+        utf8_length = 3;
+      } else {
+        // Illegal.
+        break;
+      }
+
+      if (iter + (utf8_length - 1) == str.end()) {
+        break;
+      }
+
+      string component = string(iter, iter + utf8_length);
+      const map<string, BPMF::Component>& charToComp = BopomofoCharacterMap::SharedInstance().characterToComponent;
+      map<string, BPMF::Component>::const_iterator result = charToComp.find(component);
+      if (result == charToComp.end()) {
+        break;
+      } else {
+        syllable += BPMF((*result).second);
+      }
+      iter += utf8_length;
     }
-    
     return syllable;
 }
 
@@ -736,29 +759,6 @@ void BopomofoKeyboardLayout::FinalizeLayouts()
     #undef FL
 }
 
-const BopomofoKeyboardLayout* BopomofoKeyboardLayout::LayoutForName(const string& name)
-{
-    if (OVWildcard::Match(name, "standard"))
-        return StandardLayout();
-        
-    if (OVWildcard::Match(name, "eten"))
-        return ETenLayout();
-        
-    if (OVWildcard::Match(name, "hsu"))
-        return HsuLayout();
-    
-    if (OVWildcard::Match(name, "eten26"))
-        return ETen26Layout();
-
-    if (OVWildcard::Match(name, "IBM"))
-        return IBMLayout();
-
-    if (OVWildcard::Match(name, "hanyupinyin") || OVWildcard::Match(name, "hanyu pinyin") || OVWildcard::Match(name, "hanyu-pinyin") || OVWildcard::Match(name, "pinyin"))
-        return HanyuPinyinLayout();
-
-    return 0;
-}
-
 #define ASSIGNKEY1(m, vec, k, val) m[k] = (vec.clear(), vec.push_back((BPMF::Component)val), vec)
 #define ASSIGNKEY2(m, vec, k, val1, val2) m[k] = (vec.clear(), vec.push_back((BPMF::Component)val1), vec.push_back((BPMF::Component)val2), vec)
 #define ASSIGNKEY3(m, vec, k, val1, val2, val3) m[k] = (vec.clear(), vec.push_back((BPMF::Component)val1), vec.push_back((BPMF::Component)val2), vec.push_back((BPMF::Component)val3), vec)

Source/Engine/Mandarin/Mandarin.h

@@ -271,9 +271,6 @@ namespace Formosa {
             static const BopomofoKeyboardLayout* IBMLayout();
             static const BopomofoKeyboardLayout* HanyuPinyinLayout();
             
-            // recognizes (case-insensitive): standard, eten, hsu, eten26, ibm
-            static const BopomofoKeyboardLayout* LayoutForName(const string& name);            
-            
             BopomofoKeyboardLayout(const BopomofoKeyToComponentMap& ktcm, const string& name)
                 : m_keyToComponent(ktcm)
                 , m_name(name)

Source/Engine/Mandarin/MandarinTest.cpp

@@ -0,0 +1,47 @@
+// Copyright (c) 2022 and onwards Lukhnos Liu
+//
+// Permission is hereby granted, free of charge, to any person
+// obtaining a copy of this software and associated documentation
+// files (the "Software"), to deal in the Software without
+// restriction, including without limitation the rights to use,
+// copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following
+// conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+
+#include "Mandarin.h"
+#include "gtest/gtest.h"
+
+namespace Formosa {
+namespace Mandarin {
+
+static std::string RoundTrip(const std::string& composedString) {
+  return BopomofoSyllable::FromComposedString(composedString).composedString();
+}
+
+TEST(MandarinTest, FromComposedString) {
+  ASSERT_EQ(RoundTrip("ㄅ"), "ㄅ");
+  ASSERT_EQ(RoundTrip("ㄅㄧ"), "ㄅㄧ");
+  ASSERT_EQ(RoundTrip("ㄅㄧˇ"), "ㄅㄧˇ");
+  ASSERT_EQ(RoundTrip("ㄅㄧˇㄆ"), "ㄆㄧˇ");
+  ASSERT_EQ(RoundTrip("ㄅㄧˇㄆ"), "ㄆㄧˇ");
+  ASSERT_EQ(RoundTrip("e"), "");
+  ASSERT_EQ(RoundTrip("é"), "");
+  ASSERT_EQ(RoundTrip("ㄅéㄆ"), "ㄅ");
+  ASSERT_EQ(RoundTrip("ㄅeㄆ"), "ㄅ");
+}
+
+}  // namespace Mandarin
+}  // namespace Formosa