Issue 5062 - [emscripten] Allow generation of custom bindings code

compiled/filter/RegExpFilter.cpp

Index: compiled/filter/RegExpFilter.cpp
===================================================================
--- a/compiled/filter/RegExpFilter.cpp
+++ b/compiled/filter/RegExpFilter.cpp
@@ -10,17 +10,20 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <cctype>
 #include <climits>
+#include <cstdio>
+#include <string>
 
 #include <emscripten.h>
 
 #include "RegExpFilter.h"
 #include "../StringScanner.h"
 #include "../StringMap.h"
 
 namespace
@@ -341,21 +344,28 @@ void RegExpFilter::ParseSitekeys(const S
     {
       if (scanner.position() > start)
         AddSitekey(DependentString(sitekeys, start, scanner.position() - start));
       start = scanner.position() + 1;
     }
   }
 }
 
-void RegExpFilter::InitJSTypes()
+void RegExpFilter::GenerateCustomBindings()
 {
-  EM_ASM(exports.RegExpFilter.typeMap = {};);
-  for (auto it = typeMap.begin(); it != typeMap.end(); ++it)
-    EM_ASM_ARGS(exports.RegExpFilter.typeMap[readString($0).replace("-", "_").toUpperCase()] = $1, &(it->first), it->second);
+  printf("exports.RegExpFilter.typeMap = {\n");
+
+  for (const auto& it : typeMap)
+  {
+    std::string type(it.first.length(), '\0');
+    for (int i = 0; i < it.first.length(); i++)
+      type[i] = (it.first[i] == '-' ? '_' : toupper(it.first[i]));
+    printf("  %s: %i,\n", type.c_str(), it.second);
+  }
+  printf("};\n");
 }
 
 RegExpFilter::DomainMap* RegExpFilter::GetDomains() const
 {
   if (!mData.DomainsParsingDone())
   {
     ParseDomains(mData.GetDomainsSource(mText), u'|');
     mData.SetDomainsParsingDone();