Issue 4125 - [emscripten] Convert filter classes to C++

compiled/api.cpp

Index: compiled/api.cpp
===================================================================
new file mode 100644
--- /dev/null
+++ b/compiled/api.cpp
@@ -0,0 +1,106 @@
+#include <exception>
+#include <string>
+
+#include <emscripten.h>
+
+#include "Filter.h"
+#include "InvalidFilter.h"
+#include "ActiveFilter.h"
+#include "RegExpFilter.h"
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wreturn-type-c-linkage"
+
+#define EXPOSE_FILTER_PROPERTY(class, type, getter, setter) \
+  type EMSCRIPTEN_KEEPALIVE class##_##getter(const FilterPtr& filter)\
+  {\
+    return std::dynamic_pointer_cast<class>(filter)->getter();\
+  }\
+  void EMSCRIPTEN_KEEPALIVE class##_##setter(\
+      const FilterPtr& filter, type value)\
+  {\
+    std::dynamic_pointer_cast<class>(filter)->setter(value);\
+  }
+
+extern "C"
+{
+  const char* EMSCRIPTEN_KEEPALIVE GetException(const std::exception& e)
+  {
+    return e.what();
+  }
+
+  size_t EMSCRIPTEN_KEEPALIVE GetSizeofString()
+  {
+    return sizeof(std::u16string);
+  }
+
+  void EMSCRIPTEN_KEEPALIVE InitString(std::u16string* str, char16_t* data, size_t len)
+  {
+    // String is already allocated on stack, we merely need to call constructor.
+    new (str) std::u16string(data, len);
+  }
+
+  void EMSCRIPTEN_KEEPALIVE DestroyString(std::u16string* str)
+  {
+    // Stack memory will be freed automatically, we need to call destructor
+    // explicitly however.
+    using namespace std;
+    str->~u16string();
+  }
+
+  size_t EMSCRIPTEN_KEEPALIVE GetStringLength(const std::u16string& str)
+  {
+    return str.length();
+  }
+
+  FilterPtr* EMSCRIPTEN_KEEPALIVE CreatePointer()
+  {
+    return new FilterPtr();
+  }
+
+  void EMSCRIPTEN_KEEPALIVE DeletePointer(FilterPtr* ptr)
+  {
+    delete ptr;
+  }
+
+  const char16_t* EMSCRIPTEN_KEEPALIVE GetStringData(const std::u16string& str)
+  {
+    return str.c_str();
+  }
+
+  std::u16string EMSCRIPTEN_KEEPALIVE Filter_GetText(const FilterPtr& filter)
+  {
+    return filter->GetText();
+  }
+
+  Filter::Type EMSCRIPTEN_KEEPALIVE Filter_GetType(const FilterPtr& filter)
+  {
+    return filter->GetType();
+  }
+
+  FilterPtr EMSCRIPTEN_KEEPALIVE Filter_FromText(const std::u16string& text)
+  {
+    return Filter::FromText(text);
+  }
+
+  const std::u16string EMSCRIPTEN_KEEPALIVE Filter_Normalize(const std::u16string& text)
+  {
+    return Filter::Normalize(text);
+  }
+
+  const std::u16string EMSCRIPTEN_KEEPALIVE InvalidFilter_GetReason(const FilterPtr& filter)
+  {
+    return std::dynamic_pointer_cast<InvalidFilter>(filter)->GetReason();
+  }
+
+  EXPOSE_FILTER_PROPERTY(ActiveFilter, bool, GetDisabled, SetDisabled);
+  EXPOSE_FILTER_PROPERTY(ActiveFilter, unsigned int, GetHitCount, SetHitCount);
+  EXPOSE_FILTER_PROPERTY(ActiveFilter, unsigned int, GetLastHit, SetLastHit);
+
+  bool EMSCRIPTEN_KEEPALIVE RegExpFilter_Matches(const FilterPtr& filter, const std::u16string& location)
+  {
+    return std::dynamic_pointer_cast<RegExpFilter>(filter)->Matches(location);
+  }
+}
+
+#pragma clang diagnostic pop