parser: fix map init with multi enum keys (fix #15965) (#15991)

vlib/v/parser/containers.v

@@ -192,6 +192,11 @@ fn (mut p Parser) array_init() ast.ArrayInit {
 
 // parse tokens between braces
 fn (mut p Parser) map_init() ast.MapInit {
+	old_inside_map_init := p.inside_map_init
+	p.inside_map_init = true
+	defer {
+		p.inside_map_init = old_inside_map_init
+	}
 	first_pos := p.prev_tok.pos()
 	mut keys := []ast.Expr{}
 	mut vals := []ast.Expr{}

vlib/v/parser/expr.v

@@ -387,13 +387,11 @@ pub fn (mut p Parser) expr_with_left(left ast.Expr, precedence int, is_stmt_iden
 	}
 	// Infix
 	for precedence < p.tok.precedence() {
-		if p.tok.kind == .dot { //&& (p.tok.line_nr == p.prev_tok.line_nr
-			// TODO fix a bug with prev_tok.last_line
-			//|| p.prev_tok.pos().last_line == p.tok.line_nr) {
-			// if p.fileis('vcache.v') {
-			// p.warn('tok.line_nr = $p.tok.line_nr; prev_tok.line_nr=$p.prev_tok.line_nr;
-			// prev_tok.last_line=$p.prev_tok.pos().last_line')
-			//}
+		if p.tok.kind == .dot {
+			// no spaces or line break before dot in map_init
+			if p.inside_map_init && p.tok.pos - p.prev_tok.pos > p.prev_tok.len {
+				return node
+			}
 			node = p.dot_expr(node)
 			if p.name_error {
 				return node

vlib/v/parser/parser.v

@@ -59,6 +59,7 @@ mut:
 	inside_generic_params     bool // indicates if parsing between `<` and `>` of a method/function
 	inside_receiver_param     bool // indicates if parsing the receiver parameter inside the first `(` and `)` of a method
 	inside_struct_field_decl  bool
+	inside_map_init           bool
 	or_is_handled             bool       // ignore `or` in this expression
 	builtin_mod               bool       // are we in the `builtin` module?
 	mod                       string     // current module name

vlib/v/tests/map_init_with_multi_enum_keys_test.v

@@ -0,0 +1,42 @@
+enum Foo {
+	a
+	b
+}
+
+type NestedAbc = map[string]string | string
+
+enum NestedFoo {
+	a
+	b
+	c
+}
+
+fn test_map_init_with_multi_enum_keys() {
+	mp := {
+		Foo.a: 'A'
+		.b:    'B',
+	}
+	println(mp)
+	assert mp[.a] == 'A'
+	assert mp[.b] == 'B'
+}
+
+fn test_nested_map_init_with_multi_enum_keys() {
+	mp := {
+		NestedFoo.a: NestedAbc({
+			'A': 'AA'
+		})
+		.b:          'B',
+		.c:          {
+			'c': 'C'
+		},
+	}
+	println(mp)
+	assert mp[.a]? == NestedAbc({
+		'A': 'AA'
+	})
+	assert mp[.b]? == NestedAbc('B')
+	assert mp[.c]? == NestedAbc({
+		'c': 'C'
+	})
+}