parser: add support for multiple struct field attributes

vlib/json/json_test.v

@@ -27,10 +27,11 @@ struct User {
 	last_name 	string 	[json:lastName]
 	is_registered	bool 	[json:IsRegistered]
     typ int  [json:'type']
+	pets string [raw; json:'pet_animals']
 }
 
 fn test_parse_user() {
-	s := '{"age": 10, "nums": [1,2,3], "type": 1, "lastName": "Johnson", "IsRegistered": true}'
+	s := '{"age": 10, "nums": [1,2,3], "type": 1, "lastName": "Johnson", "IsRegistered": true, "pet_animals": {"name": "Bob", "animal": "Dog"}}'
 	u2 := json.decode(User2, s) or {
 		exit(1)
 	}
@@ -47,11 +48,12 @@ fn test_parse_user() {
 	assert u.nums[1] == 2
 	assert u.nums[2] == 3
     assert u.typ == 1
+	assert u.pets == '{"name":"Bob","animal":"Dog"}'
 }
 
 fn test_encode_user(){
-	usr := User{ age: 10, nums: [1,2,3], last_name: 'Johnson', is_registered: true, typ: 0}
-	expected := '{"age":10,"nums":[1,2,3],"lastName":"Johnson","IsRegistered":true,"type":0}'
+	usr := User{ age: 10, nums: [1,2,3], last_name: 'Johnson', is_registered: true, typ: 0, pets: 'foo'}
+	expected := '{"age":10,"nums":[1,2,3],"lastName":"Johnson","IsRegistered":true,"type":0,"pet_animals":"foo"}'
 	out := json.encode(usr)
 	println(out)
 	assert out == expected

vlib/v/ast/ast.v

@@ -109,7 +109,7 @@ pub:
 	comment          Comment
 	default_expr     Expr
 	has_default_expr bool
-	attr             string
+	attrs             []string
 mut:
 	typ              table.Type
 }

vlib/v/checker/tests/multiple_fn_attributes.out

@@ -0,0 +1,4 @@
+vlib/v/checker/tests/multiple_fn_attributes.v:2:1: error: multiple attributes detected 
+    1 | [inline;deprecated]
+    2 | fn foo(name string) string {}
+      | ~~

vlib/v/checker/tests/multiple_fn_attributes.vv

@@ -0,0 +1,2 @@
+[inline;deprecated]
+fn foo(name string) string {}

vlib/v/checker/tests/trailing_comma_struct_attr.out

@@ -0,0 +1,6 @@
+vlib/v/checker/tests/trailing_comma_struct_attr.v:3:31: error: unexpected `]`, expecting `name` 
+    1 | struct User {
+    2 |     name string
+    3 |     jobs []string [json:jobss;]
+      |                               ^
+    4 | }

vlib/v/checker/tests/trailing_comma_struct_attr.vv

@@ -0,0 +1,4 @@
+struct User {
+    name string
+    jobs []string [json:jobss;]
+}

vlib/v/gen/json.v

@@ -70,13 +70,19 @@ cJSON* ${enc_fn_name}($styp val) {
 		}
 		info := sym.info as table.Struct
 		for field in info.fields {
-			if field.attr == 'skip' {
+			if 'skip' in field.attrs {
 				continue
 			}
-			name := if field.attr.starts_with('json:') { field.attr[5..] } else { field.name }
+			mut name := field.name
+			for attr in field.attrs {
+				if attr.starts_with('json:') {
+					name = attr[5..]
+					break
+				}
+			}
 			field_type := g.typ(field.typ)
 			enc_name := js_enc_name(field_type)
-			if field.attr == 'raw' {
+			if 'raw' in field.attrs {
 				dec.writeln(' res . $field.name = tos2(cJSON_PrintUnformatted(' + 'js_get(root, "$name")));')
 			} else {
 				// Now generate decoders for all field types in this struct

vlib/v/parser/parser.v

@@ -310,7 +310,12 @@ pub fn (mut p Parser) top_stmt() ast.Stmt {
 			}
 		}
 		.lsbr {
-			return p.attribute()
+			attrs := p.attributes()
+
+			if attrs.len > 1 {
+				p.error('multiple attributes detected')
+			}
+			return attrs[0]
 		}
 		.key_interface {
 			return p.interface_decl()
@@ -481,8 +486,29 @@ pub fn (mut p Parser) stmt() ast.Stmt {
 	}
 }
 
-fn (mut p Parser) attribute() ast.Attr {
+fn (mut p Parser) attributes() []ast.Attr {
+	mut attrs := []ast.Attr{}
+
 	p.check(.lsbr)
+	for p.tok.kind != .rsbr {
+		attr := p.parse_attr()
+		attrs << attr
+		if p.tok.kind != .semicolon {
+			expected := `;`
+			if p.tok.kind == .rsbr {
+				p.next()
+				break
+			}
+
+			p.error('unexpected `${p.tok.kind.str()}`, expecting `${expected.str()}`')
+		}
+		p.next()
+	}
+
+	return attrs
+}
+
+fn (mut p Parser) parse_attr() ast.Attr {
 	mut is_if_attr := false
 	if p.tok.kind == .key_if {
 		p.next()
@@ -499,7 +525,6 @@ fn (mut p Parser) attribute() ast.Attr {
 			p.next()
 		}
 	}
-	p.check(.rsbr)
 	p.attr = name
 	if is_if_attr {
 		p.attr_ctdefine = name

vlib/v/parser/struct.v

@@ -117,9 +117,12 @@ fn (mut p Parser) struct_decl() ast.StructDecl {
 				}
 				has_default_expr = true
 			}
-			mut attr := ast.Attr{}
+			mut attrs := []string{}
 			if p.tok.kind == .lsbr {
-				attr = p.attribute()
+				parsed_attrs := p.attributes()
+				for attr in parsed_attrs {
+					attrs << attr.name
+				}
 			}
 			if p.tok.kind == .comment {
 				comment = p.comment()
@@ -132,7 +135,7 @@ fn (mut p Parser) struct_decl() ast.StructDecl {
 				comment: comment
 				default_expr: default_expr
 				has_default_expr: has_default_expr
-				attr: attr.name
+				attrs: attrs
 			}
 			fields << table.Field{
 				name: field_name
@@ -142,7 +145,7 @@ fn (mut p Parser) struct_decl() ast.StructDecl {
 				is_pub: is_field_pub
 				is_mut: is_field_mut
 				is_global: is_field_global
-				attr: attr.name
+				attrs: attrs
 			}
 			// println('struct field $ti.name $field_name')
 		}

vlib/v/table/atypes.v

@@ -564,7 +564,7 @@ mut:
 	default_expr     FExpr
 	has_default_expr bool
 	default_val      string
-	attr             string
+	attrs            []string
 	is_pub           bool
 	is_mut           bool
 	is_global        bool