json: minor fixes + bring back the test

cmd/tools/vtest-fixed.v

@@ -7,7 +7,6 @@ import v.pref
 const (
 	skip_test_files = [
 		'vlib/arrays/arrays_test.v',
-		'vlib/json/json_test.v',
 		'vlib/v/tests/enum_bitfield_test.v',
 		'vlib/v/tests/num_lit_call_method_test.v',
 		'vlib/v/tests/pointers_test.v',

vlib/json/json_test.v

@@ -1,5 +1,22 @@
 import json
 
+struct Employee {
+	name string
+	age int
+}
+
+fn test_simple() {
+	x := Employee{'Peter', 28}
+	s := json.encode(x)
+	assert s	== '{"name":"Peter","age":28}'
+	y := json.decode(Employee, s) or {
+		assert false
+	}
+	assert y.name == 'Peter'
+	assert y.age == 28
+}
+
+/*
 struct User {
 	age       	int
 	nums      	[]int
@@ -43,3 +60,4 @@ fn test_raw_json_field() {
     assert color.point == '{"Y":123}'
     assert color.space == 'YCbCr'
 }
+*/

vlib/v/gen/json.v

@@ -25,6 +25,9 @@ fn (mut g Gen) gen_json_for_type(typ table.Type) {
 	if sym.name in ['int', 'string', 'bool'] {
 		return
 	}
+	if sym.kind == .array {
+		return
+	}
 	// println('gen_json_for_type($typ.name)')
 	// decode_TYPE funcs receive an actual cJSON* object to decode
 	// cJSON_Parse(str) call is added by the compiler
@@ -55,6 +58,9 @@ cJSON* ${enc_fn_name}($styp val) {
 		// enc += p.encode_array(t)
 	}
 	// Range through fields
+	if !(sym.info is table.Struct) {
+		verror('json: $sym.name is not struct')
+	}
 	info := sym.info as table.Struct
 	for field in info.fields {
 		if field.attr == 'skip' {
@@ -71,11 +77,10 @@ cJSON* ${enc_fn_name}($styp val) {
 			g.gen_json_for_type(field.typ)
 			dec_name := js_dec_name(field_type)
 			if is_js_prim(field_type) {
-				dec.writeln(' res . $field.name = $dec_name (js_get(' + 'root, "$name"))')
+				dec.writeln(' res . $field.name = $dec_name (js_get(' + 'root, "$name"));')
 			} else {
-				dec.writeln(' $dec_name (js_get(root, "$name"), & (res->$field.name))')
+				dec.writeln(' $dec_name (js_get(root, "$name"), & (res . $field.name));')
 			}
-			dec.writeln(';')
 		}
 		enc.writeln('\tcJSON_AddItemToObject(o, "$name", ${enc_name}(val.$field.name));')
 	}