fix: Idx1 of ObjectLiteral and ArrayLiteral (#504)

Fix Idx1 of ObjectLiteral  so that it points to the character immediately after the right brace.

Fix Idx1 of ArrayLiteral so that it points to the character immediately after the right bracket.

ast/node.go

@@ -36,7 +36,7 @@ func (al *ArrayLiteral) Idx0() file.Idx {
 
 // Idx1 implements Node.
 func (al *ArrayLiteral) Idx1() file.Idx {
-	return al.RightBracket
+	return al.RightBracket + 1
 }
 
 // expression implements Expression.
@@ -343,7 +343,7 @@ func (ol *ObjectLiteral) Idx0() file.Idx {
 
 // Idx1 implements Node.
 func (ol *ObjectLiteral) Idx1() file.Idx {
-	return ol.RightBrace
+	return ol.RightBrace + 1
 }
 
 // expression implements Expression.

parser/parser_test.go

@@ -1042,6 +1042,20 @@ func TestPosition(t *testing.T) {
 		node = block.List[0].(*ast.ForInStatement)
 		is(node.Idx0(), 14)
 		is(parser.slice(node.Idx0(), node.Idx1()), "for (p in o) { console.log(p); }")
+
+		parser = newParser("", "x = {x: 1}", 1, nil)
+		program, err = parser.parse()
+		is(err, nil)
+		node = program.Body[0].(*ast.ExpressionStatement).Expression.(*ast.AssignExpression).Right.(*ast.ObjectLiteral)
+		is(node.Idx0(), 5)
+		is(parser.slice(node.Idx0(), node.Idx1()), "{x: 1}")
+
+		parser = newParser("", "x = [1, 2]", 1, nil)
+		program, err = parser.parse()
+		is(err, nil)
+		node = program.Body[0].(*ast.ExpressionStatement).Expression.(*ast.AssignExpression).Right.(*ast.ArrayLiteral)
+		is(node.Idx0(), 5)
+		is(parser.slice(node.Idx0(), node.Idx1()), "[1, 2]")
 	})
 }