config/lang: don't see * as part of var name [GH-2046]

config/lang/ast/call.go

@@ -41,3 +41,7 @@ func (n *Call) Type(s Scope) (Type, error) {
 
 	return f.ReturnType, nil
 }
+
+func (n *Call) GoString() string {
+	return fmt.Sprintf("*%#v", *n)
+}

config/lang/lex.go

@@ -192,12 +192,20 @@ func (x *parserLex) lexModeInterpolation(yylval *parserSymType) int {
 
 func (x *parserLex) lexId(yylval *parserSymType) int {
 	var b bytes.Buffer
+	var last rune
 	for {
 		c := x.next()
 		if c == lexEOF {
 			break
 		}
 
+		// We only allow * after a '.' for resource splast: type.name.*.id
+		// Otherwise, its probably multiplication.
+		if c == '*' && last != '.' {
+			x.backup()
+			break
+		}
+
 		// If this isn't a character we want in an ID, return out.
 		// One day we should make this a regexp.
 		if c != '_' &&
@@ -214,6 +222,8 @@ func (x *parserLex) lexId(yylval *parserSymType) int {
 			x.Error(err.Error())
 			return lexEOF
 		}
+
+		last = c
 	}
 
 	yylval.token = &parserToken{Value: b.String()}

config/lang/parse_test.go

@@ -183,6 +183,41 @@ func TestParse(t *testing.T) {
 			},
 		},
 
+		{
+			"foo ${var.bar*1} baz",
+			false,
+			&ast.Concat{
+				Posx: ast.Pos{Column: 1, Line: 1},
+				Exprs: []ast.Node{
+					&ast.LiteralNode{
+						Value: "foo ",
+						Typex: ast.TypeString,
+						Posx:  ast.Pos{Column: 1, Line: 1},
+					},
+					&ast.Arithmetic{
+						Op: ast.ArithmeticOpMul,
+						Exprs: []ast.Node{
+							&ast.VariableAccess{
+								Name: "var.bar",
+								Posx: ast.Pos{Column: 7, Line: 1},
+							},
+							&ast.LiteralNode{
+								Value: 1,
+								Typex: ast.TypeInt,
+								Posx:  ast.Pos{Column: 15, Line: 1},
+							},
+						},
+						Posx: ast.Pos{Column: 7, Line: 1},
+					},
+					&ast.LiteralNode{
+						Value: " baz",
+						Typex: ast.TypeString,
+						Posx:  ast.Pos{Column: 17, Line: 1},
+					},
+				},
+			},
+		},
+
 		{
 			"${foo()}",
 			false,