encoder: to ignore null property

Author: kuenishi

c_src/encoder.c

@@ -278,12 +278,15 @@ match_record(ErlNifEnv* env, int arity, const ERL_NIF_TERM *tuple, State *st){
       unsigned bin_size = 0;
       b_putc('{', st);
       for(k = 0; k < records[i].arity; k++){
-	EncField field = fields[fds_offset + k];
-	bin_size += field.size;
+
+        if(tuple[k+1] != st->priv->am_null){
+          EncField field = fields[fds_offset + k];
+          bin_size += field.size;
 	//FIXME {
-	b_puts(field.size, st->records->bin.data + field.offset, st);
-	if(!match_term(env, tuple[k+1], st))
-	  return 0;
+          b_puts(field.size, st->records->bin.data + field.offset, st);
+          if(!match_term(env, tuple[k+1], st))
+            return 0;
+        }
       }
       b_putc('}', st);
       return 1;

test/encode_records_test.erl

@@ -20,3 +20,10 @@ encrec1_test() ->
 encrec2_test() ->
     F = jsonx:encoder([ {rec, record_info(fields, rec)} ]),
     <<"{\"a\": \"x\",\"b\": {\"a\": {\"a\": \"x\",\"b\": \"y\"},\"b\": \"w\"}}">> = F({rec, x, {rec, {rec, x, y}, w}}).
+
+
+
+encrec3_test() ->
+    %%F = jsonx:encoder([ {spam, [a, b, c]} ], [{ignore,null}]),
+    F = jsonx:encoder([ {spam, [a, b, c]} ]),
+    <<"{}">> = F({spam, null, null, null}).