Improve parsing performance.

Author: ColinH

include/tao/json/sax/from_string.hpp

@@ -20,7 +20,11 @@ namespace tao
          template< typename Consumer >
          inline void from_string( const char* data, const std::size_t size, Consumer& consumer, const char* source = nullptr, const std::size_t byte = 0, const std::size_t line = 1, const std::size_t column = 0 )
          {
-            json_pegtl::memory_input<> input( data, data + size, source ? source : "tao::json::sax::from_string", byte, line, column );
+            // TODO:
+            (void)byte;
+            (void)line;
+            (void)column;
+            json_pegtl::memory_input< json_pegtl::lf_crlf_eol, json_pegtl::tracking_mode::LAZY > input( data, data + size, source ? source : "tao::json::sax::from_string" );
             json_pegtl::parse< internal::grammar, internal::action, internal::control >( input, consumer );
          }