parser: deprecate old attribute syntax & update remaining (missed) attributes (#19879)

vlib/net/http/request.v

@@ -24,7 +24,7 @@ pub mut:
 	method     Method  = .get
 	header     Header
 	host       string
-	cookies    map[string]string [deprecated: 'use req.cookie(name) and req.add_cookie(name) instead']
+	cookies    map[string]string @[deprecated: 'use req.cookie(name) and req.add_cookie(name) instead']
 	data       string
 	url        string
 	user_agent string = 'v.http'

vlib/v/checker/tests/generic_interface_missing_type_names_err.vv

@@ -5,11 +5,11 @@ interface Output[T] {
 
 struct Coil {
   pub mut: val int
-  pub: name string [required]
+  pub: name string @[required]
 }
 struct Light {
   pub mut: val int
-  pub: name string [required]
+  pub: name string @[required]
 }
 
 fn main() {

vlib/v/checker/tests/struct_field_type_err.vv

@@ -2,8 +2,8 @@ struct Data {
 mut:
 	n    int
 	b    bool
-	f1   fn (voidptr) [required]
+	f1   fn (voidptr) @[required]
-	f2   fn (...voidptr) [required]
+	f2   fn (...voidptr) @[required]
 	data &Data
 }
 

vlib/v/checker/tests/unknown_type_in_anon_fn.out

@@ -1,7 +1,7 @@
 vlib/v/checker/tests/unknown_type_in_anon_fn.vv:5:10: error: unknown type `Another`
     3 | struct Struc{
     4 | mut:
-    5 |     f fn (s Another, i int)? [required]
+    5 |     f fn (s Another, i int)? @[required]
       |             ~~~~~~~
     6 | }
     7 |

vlib/v/checker/tests/unknown_type_in_anon_fn.vv

@@ -2,7 +2,7 @@ module main
 
 struct Struc{
 mut:
-	f fn (s Another, i int)? [required]
+	f fn (s Another, i int)? @[required]
 }
 
 fn main() {}

vlib/v/parser/parse_type.v

@@ -445,10 +445,13 @@ fn (mut p Parser) parse_type() ast.Type {
 
 	if is_option || is_result {
 		// maybe the '[' is the start of the field attribute
+		// TODO: remove once old syntax dropped
 		is_required_field := p.inside_struct_field_decl && p.tok.kind == .lsbr
 			&& p.peek_tok.kind == .name && p.peek_tok.lit == 'required'
+		is_attr := p.tok.kind == .at
 
-		if p.tok.line_nr > line_nr || p.tok.kind in [.comma, .rpar, .assign] || is_required_field {
+		if p.tok.line_nr > line_nr || p.tok.kind in [.comma, .rpar, .assign]
+			|| (is_attr || is_required_field) {
 			mut typ := ast.void_type
 			if is_option {
 				typ = typ.set_flag(.option)

vlib/v/parser/parser.v

@@ -1812,8 +1812,10 @@ fn (mut p Parser) is_attributes() bool {
 
 // when is_top_stmt is true attrs are added to p.attrs
 fn (mut p Parser) attributes() {
+	start_pos := p.tok.pos()
 	mut is_at := false
 	if p.tok.kind == .lsbr {
+		p.note('`[attr]` has been deprecated, use `@[attr]` instead')
 		// [attr]
 		p.check(.lsbr)
 	} else if p.tok.kind == .at {
@@ -1824,16 +1826,16 @@ fn (mut p Parser) attributes() {
 	}
 	mut has_ctdefine := false
 	for p.tok.kind != .rsbr {
-		start_pos := p.tok.pos()
+		attr_start_pos := p.tok.pos()
 		attr := p.parse_attr(is_at)
 		if p.attrs.contains(attr.name) && attr.name != 'wasm_export' {
-			p.error_with_pos('duplicate attribute `${attr.name}`', start_pos.extend(p.prev_tok.pos()))
+			p.error_with_pos('duplicate attribute `${attr.name}`', attr_start_pos.extend(p.prev_tok.pos()))
 			return
 		}
 		if attr.kind == .comptime_define {
 			if has_ctdefine {
 				p.error_with_pos('only one `[if flag]` may be applied at a time `${attr.name}`',
-					start_pos.extend(p.prev_tok.pos()))
+					attr_start_pos.extend(p.prev_tok.pos()))
 				return
 			} else {
 				has_ctdefine = true
@@ -1851,7 +1853,7 @@ fn (mut p Parser) attributes() {
 		p.next()
 	}
 	if p.attrs.len == 0 {
-		p.error_with_pos('attributes cannot be empty', p.prev_tok.pos().extend(p.tok.pos()))
+		p.error_with_pos('attributes cannot be empty', start_pos.extend(p.tok.pos()))
 		return
 	}
 	// TODO: remove when old attr syntax is removed

vlib/v/parser/tests/fn_attributes_empty_err.out

@@ -1,5 +1,5 @@
 vlib/v/parser/tests/fn_attributes_empty_err.vv:1:1: error: attributes cannot be empty
-    1 | [] fn tt() {
+    1 | @[] fn tt() {
-      | ~~
+      | ~~~
     2 |     println('text')
     3 | }

vlib/v/parser/tests/fn_attributes_empty_err.vv

@@ -1,4 +1,4 @@
-[] fn tt() {
+@[] fn tt() {
 	println('text')
 }
 fn main() {

vlib/v/parser/tests/struct_field_required_fn_option_type.vv

@@ -1,5 +1,5 @@
 struct Foo {
-	foo fn () ? [required]
+	foo fn () ? @[required]
 }
 
 fn main() {

vlib/v/parser/tests/struct_field_required_fn_result_type.vv

@@ -1,5 +1,5 @@
 struct Foo {
-	foo fn() ! [required]
+	foo fn() ! @[required]
 }
 
 fn main() {

vlib/vweb/vweb.v

@@ -1181,7 +1181,7 @@ fn (mut w Worker[T]) process_incoming_requests() {
 
 @[params]
 pub struct PoolParams[T] {
-	handler    fn () T [required] = unsafe { nil }
+	handler    fn () T = unsafe { nil } @[required]
 	nr_workers int = runtime.nr_jobs()
 }