builtin: add map.values() (#14301)

vlib/builtin/map.v

@@ -86,8 +86,8 @@ mut:
 	// array allocated (with `cap` bytes) on first deletion
 	// has non-zero element when key deleted
 	all_deleted &u8
-	values      &u8
 	keys        &u8
+	values      &u8
 }
 
 [inline]
@@ -126,8 +126,8 @@ fn (d &DenseArray) has_index(i int) bool {
 [inline]
 fn (mut d DenseArray) expand() int {
 	old_cap := d.cap
-	old_value_size := d.value_bytes * old_cap
 	old_key_size := d.key_bytes * old_cap
+	old_value_size := d.value_bytes * old_cap
 	if d.cap == d.len {
 		d.cap += d.cap >> 3
 		unsafe {
@@ -628,6 +628,31 @@ pub fn (m &map) keys() array {
 	return keys
 }
 
+// Returns all values in the map.
+pub fn (m &map) values() array {
+	mut values := __new_array(m.len, 0, m.value_bytes)
+	mut item := unsafe { &u8(values.data) }
+
+	if m.key_values.deletes == 0 {
+		unsafe {
+			vmemcpy(item, m.key_values.values, m.value_bytes * m.key_values.len)
+		}
+		return values
+	}
+
+	for i := 0; i < m.key_values.len; i++ {
+		if !m.key_values.has_index(i) {
+			continue
+		}
+		unsafe {
+			pvalue := m.key_values.value(i)
+			vmemcpy(item, pvalue, m.value_bytes)
+			item = item + m.value_bytes
+		}
+	}
+	return values
+}
+
 // warning: only copies keys, does not clone
 [unsafe]
 fn (d &DenseArray) clone() DenseArray {

vlib/builtin/map_test.v

@@ -47,6 +47,16 @@ fn test_keys_many() {
 	assert keys == strings
 }
 
+fn test_values_many() {
+	mut m := map[string]int{}
+	for i, s in strings {
+		m[s] = i
+	}
+	values := m.values()
+	assert values.len == strings.len
+	assert values.len == m.len
+}
+
 fn test_deletes_many() {
 	mut m := map[string]int{}
 	for i, s in strings {
@@ -59,6 +69,7 @@ fn test_deletes_many() {
 	}
 	assert m.len == 0
 	assert m.keys().len == 0
+	assert m.values().len == 0
 }
 
 struct User {
@@ -103,6 +114,13 @@ fn test_map() {
 	assert m['hi'] == 0
 	assert m.keys().len == 1
 	assert m.keys()[0] == 'hello'
+	// Test `.values()`
+	values := m.values()
+	assert values.len == 1
+	assert 80 !in values
+	assert 101 in values
+	assert m.values().len == 1
+	assert m.values()[0] == 101
 	// //
 	mut users := map[string]User{}
 	users['1'] = User{'Peter'}
@@ -580,6 +598,7 @@ fn test_int_keys() {
 		4: 16
 		5: 25
 	}
+	assert m2.values() == [9, 16, 25]
 
 	assert m2.len == 3
 	// clone
@@ -636,6 +655,16 @@ fn test_voidptr_keys() {
 	assert m.len == 2
 }
 
+fn test_voidptr_values() {
+	mut m := map[string]voidptr{}
+	v := 5
+	m['var'] = &v
+	m['map'] = &m
+	assert m['var'] == &v
+	assert m['map'] == &m
+	assert m.values().len == 2
+}
+
 fn test_rune_keys() {
 	mut m := {
 		`!`: 2

vlib/v/checker/fn.v

@@ -1111,7 +1111,7 @@ pub fn (mut c Checker) method_call(mut node ast.CallExpr) ast.Type {
 	if left_sym.kind == .array && method_name in array_builtin_methods {
 		return c.array_builtin_method_call(mut node, left_type, c.table.sym(left_type))
 	} else if (left_sym.kind == .map || final_left_sym.kind == .map)
-		&& method_name in ['clone', 'keys', 'move', 'delete'] {
+		&& method_name in ['clone', 'keys', 'values', 'move', 'delete'] {
 		if left_sym.kind == .map {
 			return c.map_builtin_method_call(mut node, left_type, left_sym)
 		} else {
@@ -1820,12 +1820,16 @@ fn (mut c Checker) map_builtin_method_call(mut node ast.CallExpr, left_type ast.
 			}
 			ret_type = ret_type.clear_flag(.shared_f)
 		}
-		'keys' {
+		'keys', 'values' {
 			if node.args.len != 0 {
-				c.error('`.keys()` does not have any arguments', node.args[0].pos)
+				c.error('`.${method_name}()` does not have any arguments', node.args[0].pos)
 			}
 			info := left_sym.info as ast.Map
-			typ := c.table.find_or_register_array(info.key_type)
+			typ := if method_name == 'keys' {
+				c.table.find_or_register_array(info.key_type)
+			} else {
+				c.table.find_or_register_array(info.value_type)
+			}
 			ret_type = ast.Type(typ)
 		}
 		'delete' {

vlib/v/gen/c/fn.v

@@ -1044,6 +1044,8 @@ fn (mut g Gen) method_call(node ast.CallExpr) {
 	} else if final_left_sym.kind == .map {
 		if node.name == 'keys' {
 			name = 'map_keys'
+		} else if node.name == 'values' {
+			name = 'map_values'
 		}
 	}
 	if g.pref.obfuscate && g.cur_mod.name == 'main' && name.starts_with('main__')