short struct init syntax

vlib/v/checker/checker.v

@@ -76,6 +76,14 @@ pub fn (c mut Checker) struct_init(struct_init mut ast.StructInit) table.Type {
 	// c.error('unknown struct: $struct_init.typ.typ.name', struct_init.pos)
 	// panic('')
 	// }
+	if struct_init.typ == table.void_type {
+		// Short syntax `({foo: bar})`
+		if c.expected_type == table.void_type {
+			c.error('unexpected short struct syntax', struct_init.pos)
+			return table.void_type
+		}
+		struct_init.typ = c.expected_type
+	}
 	typ_sym := c.table.get_type_symbol(struct_init.typ)
 	// println('check struct $typ_sym.name')
 	match typ_sym.kind {

vlib/v/parser/parser.v

@@ -548,12 +548,14 @@ pub fn (p mut Parser) parse_ident(is_c bool) ast.Ident {
 	return ident
 }
 
-fn (p mut Parser) struct_init() ast.StructInit {
-	typ := p.parse_type()
+fn (p mut Parser) struct_init(short_syntax bool) ast.StructInit {
+	typ := if short_syntax { table.void_type } else { p.parse_type() }
 	p.expr_mod = ''
 	// sym := p.table.get_type_symbol(typ)
 	// p.warn('struct init typ=$sym.name')
-	p.check(.lcbr)
+	if !short_syntax {
+		p.check(.lcbr)
+	}
 	mut field_names := []string
 	mut exprs := []ast.Expr
 	mut i := 0
@@ -585,7 +587,9 @@ fn (p mut Parser) struct_init() ast.StructInit {
 		fields: field_names
 		pos: p.tok.position()
 	}
-	p.check(.rcbr)
+	if !short_syntax {
+		p.check(.rcbr)
+	}
 	return node
 }
 
@@ -674,7 +678,7 @@ pub fn (p mut Parser) name_expr() ast.Expr {
 	//
 	{
 		// || p.table.known_type(p.tok.lit)) {
-		return p.struct_init()
+		return p.struct_init(false) // short_syntax: false
 	}
 	else if p.peek_tok.kind == .dot && (p.tok.lit[0].is_capital() && !known_var) {
 		// `Color.green`
@@ -798,53 +802,17 @@ pub fn (p mut Parser) expr(precedence int) ast.Expr {
 		.lcbr {
 			p.next()
 			if p.tok.kind == .string {
-				mut keys := []ast.Expr
-				mut vals := []ast.Expr
-				for p.tok.kind != .rcbr && p.tok.kind != .eof {
-					// p.check(.str)
-					key := p.expr(0)
-					keys << key
-					p.check(.colon)
-					val := p.expr(0)
-					vals << val
-					if p.tok.kind == .comma {
-						p.next()
-					}
-				}
-				node = ast.MapInit{
-					keys: keys
-					vals: vals
-					pos: p.tok.position()
-				}
+				node = p.map_init()
 			}
 			else {
-				name := p.check_name()
-				var := p.scope.find_var(name) or {
-					p.error('unknown variable `$name`')
-					return node
+				if p.peek_tok.kind == .pipe {
+					node = p.assoc()
 				}
-				// println('assoc var $name typ=$var.typ')
-				mut fields := []string
-				mut vals := []ast.Expr
-				p.check(.pipe)
-				for {
-					fields << p.check_name()
-					p.check(.colon)
-					expr := p.expr(0)
-					vals << expr
-					if p.tok.kind == .comma {
-						p.check(.comma)
-					}
-					if p.tok.kind == .rcbr {
-						break
-					}
+				else if p.peek_tok.kind ==  .colon || p.tok.kind == .rcbr {
+					node = p.struct_init(true) // short_syntax: true
 				}
-				node = ast.Assoc{
-					var_name: name
-					fields: fields
-					exprs: vals
-					pos: p.tok.position()
-					typ: var.typ
+				else {
+					p.error('unexpected {')
 				}
 			}
 			p.check(.rcbr)
@@ -1374,6 +1342,28 @@ fn (p mut Parser) array_init() ast.ArrayInit {
 	}
 }
 
+fn (p mut Parser) map_init() ast.MapInit {
+	pos := p.tok.position()
+	mut keys := []ast.Expr
+	mut vals := []ast.Expr
+	for p.tok.kind != .rcbr && p.tok.kind != .eof {
+		// p.check(.str)
+		key := p.expr(0)
+		keys << key
+		p.check(.colon)
+		val := p.expr(0)
+		vals << val
+		if p.tok.kind == .comma {
+			p.next()
+		}
+	}
+	return ast.MapInit{
+		keys: keys
+		vals: vals
+		pos: pos
+	}
+}
+
 fn (p mut Parser) parse_number_literal() ast.Expr {
 	lit := p.tok.lit
 	mut node := ast.Expr{}
@@ -1943,6 +1933,38 @@ fn (p mut Parser) type_decl() ast.TypeDecl {
 	}
 }
 
+fn (p mut Parser) assoc() ast.Assoc{
+	var_name := p.check_name()
+	pos := p.tok.position()
+	var := p.scope.find_var(var_name) or {
+		p.error('unknown variable `$var_name`')
+		return ast.Assoc{}
+	}
+	// println('assoc var $name typ=$var.typ')
+	mut fields := []string
+	mut vals := []ast.Expr
+	p.check(.pipe)
+	for {
+		fields << p.check_name()
+		p.check(.colon)
+		expr := p.expr(0)
+		vals << expr
+		if p.tok.kind == .comma {
+			p.check(.comma)
+		}
+		if p.tok.kind == .rcbr {
+			break
+		}
+	}
+	return ast.Assoc{
+		var_name: var_name
+		fields: fields
+		exprs: vals
+		pos: pos
+		typ: var.typ
+	}
+}
+
 fn (p &Parser) new_true_expr() ast.Expr {
 	return ast.BoolLiteral{
 		val: true

vlib/v/tests/struct_test.v

@@ -236,7 +236,6 @@ fn foo_config(c Config) {}
 fn foo2(u User) {}
 
 fn test_config() {
-	/*
 	foo_config({
 		n: 10
 		def: 20
@@ -245,5 +244,4 @@ fn test_config() {
 	foo2({
 		name: 'Peter'
 	})
-	*/
-	}
+}