doc, fmt: use map{key: value} syntax for map literals (#8623)

cmd/tools/vdoc/html.v

@@ -130,7 +130,7 @@ fn (vd VDoc) render_search_index(out Output) {
 }
 
 fn (mut vd VDoc) render_static_html(out Output) {
-	vd.assets = {
+	vd.assets = map{
 		'doc_css':       vd.get_resource(css_js_assets[0], out)
 		'normalize_css': vd.get_resource(css_js_assets[1], out)
 		'doc_js':        vd.get_resource(css_js_assets[2], out)

doc/docs.md

@@ -798,9 +798,12 @@ println(m['one']) // "1"
 println(m['bad_key']) // "0"
 println('bad_key' in m) // Use `in` to detect whether such key exists
 m.delete('two')
-// NB: map keys can have any type, `int` in this case,
-// and the whole map can be initialized using this short syntax:
-numbers := {
+```
+Maps can have keys of type string, rune, integer, float or voidptr.
+
+The whole map can be initialized using this short syntax:
+```v
+numbers := map{
 	1: 'one'
 	2: 'two'
 }
@@ -810,12 +813,14 @@ println(numbers)
 If a key is not found, a zero value is returned by default:
 
 ```v
-sm := {
+sm := map{
 	'abc': 'xyz'
 }
 val := sm['bad_key']
 println(val) // ''
-intm := {
+```
+```v
+intm := map{
 	1: 1234
 	2: 5678
 }
@@ -1061,7 +1066,7 @@ To do the opposite, use `!in`.
 nums := [1, 2, 3]
 println(1 in nums) // true
 println(4 !in nums) // true
-m := {
+m := map{
 	'one': 1
 	'two': 2
 }
@@ -1132,7 +1137,7 @@ When an identifier is just a single underscore, it is ignored.
 #### Map `for`
 
 ```v
-m := {
+m := map{
 	'one': 1
 	'two': 2
 }
@@ -1145,7 +1150,7 @@ for key, value in m {
 
 Either key or value can be ignored by using a single underscore as the identifier.
 ```v
-m := {
+m := map{
 	'one': 1
 	'two': 2
 }
@@ -1698,7 +1703,7 @@ fn main() {
 	// You can even have an array/map of functions:
 	fns := [sqr, cube]
 	println((10)) // "100"
-	fns_map := {
+	fns_map := map{
 		'sqr':  sqr
 		'cube': cube
 	}

vlib/builtin/array_test.v

@@ -1198,20 +1198,20 @@ fn test_struct_array_of_multi_type_in() {
 	ivan := Person{
 		name: 'ivan'
 		nums: [1, 2, 3]
-		kv: {
+		kv: map{
 			'aaa': '111'
 		}
 	}
 	people := [Person{
 		name: 'ivan'
 		nums: [1, 2, 3]
-		kv: {
+		kv: map{
 			'aaa': '111'
 		}
 	}, Person{
 		name: 'bob'
 		nums: [2]
-		kv: {
+		kv: map{
 			'bbb': '222'
 		}
 	}]
@@ -1223,20 +1223,20 @@ fn test_struct_array_of_multi_type_index() {
 	ivan := Person{
 		name: 'ivan'
 		nums: [1, 2, 3]
-		kv: {
+		kv: map{
 			'aaa': '111'
 		}
 	}
 	people := [Person{
 		name: 'ivan'
 		nums: [1, 2, 3]
-		kv: {
+		kv: map{
 			'aaa': '111'
 		}
 	}, Person{
 		name: 'bob'
 		nums: [2]
-		kv: {
+		kv: map{
 			'bbb': '222'
 		}
 	}]

vlib/builtin/map_of_floats_test.v

@@ -12,7 +12,7 @@ fn test_map_of_f32() {
 }
 
 fn test_map_of_f64() {
-	mut m64 := {
+	mut m64 := map{
 		3.14: 'pi'
 	}
 	m64[1.0] = 'one'

vlib/builtin/map_test.v

@@ -274,25 +274,25 @@ fn test_map_assign() {
 	mut a := map[string]f64{}
 	mut b := map[string]int{}
 	mut c := map[string]u16{}
-	a = {
+	a = map{
 		'x': 12.4
 		'y': 3
 	}
-	b = {
+	b = map{
 		'u': -13
 		'v': 12
 	}
-	c = {
+	c = map{
 		's': u16(5)
 		't': 3
 	}
-	_ := Mstruct1{{
+	_ := Mstruct1{map{
 		'p': 12
 	}}
-	_ := Mstruct2{{
+	_ := Mstruct2{map{
 		'q': 1.7
 	}}
-	_ := Mstruct3{{
+	_ := Mstruct3{map{
 		'r': u16(6)
 		's': 5
 	}}
@@ -335,7 +335,7 @@ fn test_map_in_directly() {
 }
 
 fn test_plus_assign_string() {
-	mut m := {
+	mut m := map{
 		'one': ''
 	}
 	m['one'] += '1'
@@ -344,7 +344,7 @@ fn test_plus_assign_string() {
 }
 
 fn test_map_keys_to_array() {
-	m := {
+	m := map{
 		'a': 'b'
 		'c': 'd'
 	}
@@ -364,7 +364,7 @@ fn map_in_mut(mut m map[string]int) {
 }
 
 fn test_map_in_mut() {
-	mut m := {
+	mut m := map{
 		'one': 1
 	}
 	map_in_mut(mut m)
@@ -372,7 +372,7 @@ fn test_map_in_mut() {
 }
 
 fn test_map_in() {
-	m := {
+	m := map{
 		'Foo': 'bar'
 	}
 	if 'foo'.capitalize() in m {
@@ -404,7 +404,7 @@ fn mut_map_with_relation_op_in_fn(mut m map[string]int) {
 }
 
 fn test_mut_map_with_relation_op_in_fn() {
-	mut m := {
+	mut m := map{
 		'one': 1
 		'two': 2
 	}
@@ -418,7 +418,7 @@ fn test_mut_map_with_relation_op_in_fn() {
 }
 
 fn test_map_str_after_delete() {
-	mut m := {
+	mut m := map{
 		'first':  1
 		'second': 2
 		'third':  3
@@ -432,7 +432,7 @@ fn test_map_str_after_delete() {
 }
 
 fn test_modify_map_value() {
-	mut m1 := {
+	mut m1 := map{
 		'foo': 3
 		'bar': -7
 	}
@@ -443,7 +443,7 @@ fn test_modify_map_value() {
 }
 
 fn test_map_clone() {
-	mut nums := {
+	mut nums := map{
 		'foo': 1
 		'bar': 2
 	}
@@ -470,7 +470,7 @@ fn test_map_default_zero() {
 }
 
 fn test_map_or() {
-	m := {
+	m := map{
 		'first':  1
 		'second': 2
 		'third':  3
@@ -489,7 +489,7 @@ fn test_int_keys() {
 	m[5] += 24
 	m[5]++
 	assert m[5] == 25
-	m2 := {
+	m2 := map{
 		3: 9
 		4: 16
 		5: 25
@@ -521,7 +521,7 @@ fn test_voidptr_keys() {
 }
 
 fn test_rune_keys() {
-	mut m := {
+	mut m := map{
 		`!`: 2
 		`%`: 3
 	}
@@ -541,62 +541,62 @@ fn test_rune_keys() {
 }
 
 fn test_eq() {
-	a := {
+	a := map{
 		'a': 1
 		'b': 2
 	}
-	assert a == {
+	assert a == map{
 		'a': 1
 		'b': 2
 	}
-	b := {
+	b := map{
 		'a': [[1]]
 		'b': [[2]]
 	}
-	assert b == {
+	assert b == map{
 		'a': [[1]]
 		'b': [[2]]
 	}
-	c := {
-		'a': {
+	c := map{
+		'a': map{
 			'11': 1
 		}
-		'b': {
+		'b': map{
 			'22': 2
 		}
 	}
-	assert c == {
-		'a': {
+	assert c == map{
+		'a': map{
 			'11': 1
 		}
-		'b': {
+		'b': map{
 			'22': 2
 		}
 	}
-	d := {
+	d := map{
 		'a': MValue{
 			name: 'aa'
-			misc: {
+			misc: map{
 				'11': '1'
 			}
 		}
 		'b': MValue{
 			name: 'bb'
-			misc: {
+			misc: map{
 				'22': '2'
 			}
 		}
 	}
-	assert d == {
+	assert d == map{
 		'a': MValue{
 			name: 'aa'
-			misc: {
+			misc: map{
 				'11': '1'
 			}
 		}
 		'b': MValue{
 			name: 'bb'
-			misc: {
+			misc: map{
 				'22': '2'
 			}
 		}
@@ -604,24 +604,24 @@ fn test_eq() {
 }
 
 fn test_non_string_key_map_str() {
-	assert {
+	assert map{
 		23: 4
 	}.str() == '{23: 4}'
-	assert {
+	assert map{
 		`a`: 12
 		`b`: 13
 	}.str() == '{`a`: 12, `b`: 13}'
-	assert {
+	assert map{
 		23: 'foo'
 		25: 'bar'
 	}.str() == "{23: 'foo', 25: 'bar'}"
 }
 
 fn test_map_assign_empty_map_init() {
-	mut a := {
+	mut a := map{
 		'one': 1
 	}
-	a = {}
+	a = map{}
 	println(a)
 	assert a == map[string]int{}
 	assert '$a' == '{}'

vlib/v/checker/checker.v

@@ -2593,6 +2593,8 @@ pub fn (mut c Checker) assign_stmt(mut assign_stmt ast.AssignStmt) {
 			// `map = {}`
 			sym := c.table.get_type_symbol(left_type)
 			if sym.kind == .map && assign_stmt.right[i] is ast.StructInit {
+				c.warn('assigning a struct literal to a map is deprecated - use `map{}` instead',
+					assign_stmt.right[i].position())
 				assign_stmt.right[i] = ast.MapInit{}
 			}
 		}

vlib/v/doc/doc.v

@@ -218,7 +218,7 @@ pub fn (mut d Doc) stmt(stmt ast.Stmt, filename string) ?DocNode {
 						kind: .variable
 						parent_name: node.name
 						pos: d.convert_pos(filename, param.pos)
-						attrs: {
+						attrs: map{
 							'mut': param.is_mut.str()
 						}
 						return_type: d.type_to_str(param.typ)

vlib/v/fmt/fmt.v

@@ -2034,12 +2034,17 @@ pub fn (mut f Fmt) array_init(it ast.ArrayInit) {
 
 pub fn (mut f Fmt) map_init(it ast.MapInit) {
 	if it.keys.len == 0 {
+		if it.typ > table.void_type {
 			f.mark_types_import_as_used(it.typ)
 			f.write(f.table.type_to_str(it.typ))
+		} else {
+			// m = map{}
+			f.write('map')
+		}
 		f.write('{}')
 		return
 	}
-	f.writeln('{')
+	f.writeln('map{')
 	f.indent++
 	mut max_field_len := 0
 	for key in it.keys {

vlib/v/fmt/tests/array_init_keep.vv

@@ -18,10 +18,10 @@ fn main() {
 		'eggs',
 	]
 	_ := []int{len: 10, cap: 10, init: 7}
-	_ := []map[string]string{len: 5, cap: 50, init: {
+	_ := []map[string]string{len: 5, cap: 50, init: map{
 		'a': 'a'
 	}}
-	_ := []map[string][]int{len: 7, cap: 100, init: {
+	_ := []map[string][]int{len: 7, cap: 100, init: map{
 		'a': [1, 2]
 	}}
 }

vlib/v/fmt/tests/maps_expected.vv

@@ -1,5 +1,5 @@
 const (
-	reserved_types = {
+	reserved_types = map{
 		'i8':   true
 		'i16':  true
 		'int':  true
@@ -8,7 +8,7 @@ const (
 	}
 )
 
-numbers := {
+numbers := map{
 	'one':                                 1
 	'two':                                 2
 	'sevenhundredseventyseven':            777

vlib/v/fmt/tests/maps_keep.vv

@@ -5,11 +5,11 @@ fn workaround() {
 
 fn main() {
 	mut ams := []map[string]string{}
-	ams << {
+	ams << map{
 		'a': 'b'
 		'c': 'd'
 	}
-	ams << {
+	ams << map{
 		'e': 'f'
 		'g': 'h'
 	}

vlib/v/gen/c/auto_str_methods.v

@@ -445,7 +445,7 @@ fn (mut g Gen) gen_str_for_multi_return(info table.MultiReturn, styp string, str
 fn (mut g Gen) gen_str_for_struct(info table.Struct, styp string, str_fn_name string) {
 	// TODO: short it if possible
 	// generates all definitions of substructs
-	mut fnames2strfunc := {
+	mut fnames2strfunc := map{
 		'': ''
 	} // map[string]string // TODO vfmt bug
 	for field in info.fields {

vlib/v/util/util.v

@@ -20,7 +20,7 @@ pub const (
 )
 
 pub const (
-	external_module_dependencies_for_tool = {
+	external_module_dependencies_for_tool = map{
 		'vdoc': ['markdown']
 	}
 )

vlib/vweb/tests/vweb_test.v

@@ -208,7 +208,7 @@ fn testsuite_end() {
 	// It sends a request to the server to shutdown.
 	x := http.fetch('http://127.0.0.1:$sport/shutdown', 
 		method: .get
-		cookies: {
+		cookies: map{
 			'skey': 'superman'
 		}
 	) or {

vlib/vweb/vweb.v

@@ -19,7 +19,7 @@ pub const (
 	headers_close           = '$header_server$header_connection_close\r\n'
 	http_404                = 'HTTP/1.1 404 Not Found\r\nContent-Type: text/plain\r\nContent-Length: 13\r\n${headers_close}404 Not Found'
 	http_500                = 'HTTP/1.1 500 Internal Server Error\r\nContent-Type: text/plain\r\n${headers_close}500 Internal Server Error'
-	mime_types              = {
+	mime_types              = map{
 		'.css':  'text/css; charset=utf-8'
 		'.gif':  'image/gif'
 		'.htm':  'text/html; charset=utf-8'