Fix crash when .. syntax encountered in Transact-SQL

Fixes #700

Author: nene

src/formatter/ExpressionFormatter.ts

@@ -179,7 +179,7 @@ export default class ExpressionFormatter {
 
   private formatPropertyAccess(node: PropertyAccessNode) {
     this.formatNode(node.object);
-    this.layout.add(WS.NO_SPACE, '.');
+    this.layout.add(WS.NO_SPACE, node.operator);
     this.formatNode(node.property);
   }
 

src/lexer/Tokenizer.ts

@@ -184,7 +184,7 @@ export default class Tokenizer {
         ]),
       },
       { type: TokenType.ASTERISK, regex: /[*]/uy },
-      { type: TokenType.DOT, regex: /[.]/uy },
+      { type: TokenType.DOT, regex: /[.]+/uy },
     ]);
   }
 

src/lexer/token.ts

@@ -28,7 +28,7 @@ export enum TokenType {
   OPERATOR = 'OPERATOR',
   COMMA = 'COMMA',
   ASTERISK = 'ASTERISK', // *
-  DOT = 'DOT', // .
+  DOT = 'DOT', // . (or .. in Transact-SQL)
   OPEN_PAREN = 'OPEN_PAREN',
   CLOSE_PAREN = 'CLOSE_PAREN',
   LINE_COMMENT = 'LINE_COMMENT',

src/parser/ast.ts

@@ -128,6 +128,7 @@ export interface LiteralNode extends BaseNode {
 export interface PropertyAccessNode extends BaseNode {
   type: NodeType.property_access;
   object: AstNode;
+  operator: string;
   property: IdentifierNode | ArraySubscriptNode | AllColumnsAsteriskNode;
 }
 

src/parser/grammar.ne

@@ -265,6 +265,7 @@ property_access -> atomic_expression _ %DOT _ (identifier | array_subscript | al
     return {
       type: NodeType.property_access,
       object: addComments(object, { trailing: _1 }),
+      operator: dot.text,
       property: addComments(property, { leading: _2 }),
     };
   }

test/transactsql.test.ts

@@ -101,6 +101,15 @@ describe('TransactSqlFormatter', () => {
     `);
   });
 
+  it('formats .. shorthand for database.schema.table', () => {
+    expect(format('SELECT x FROM db..tbl')).toBe(dedent`
+      SELECT
+        x
+      FROM
+        db..tbl
+    `);
+  });
+
   it('formats ALTER TABLE ... ALTER COLUMN', () => {
     expect(format(`ALTER TABLE t ALTER COLUMN foo INT NOT NULL DEFAULT 5;`)).toBe(dedent`
       ALTER TABLE t

test/unit/__snapshots__/Parser.test.ts.snap

@@ -293,6 +293,7 @@ Array [
               "text": "ident",
               "type": "identifier",
             },
+            "operator": ".",
             "property": Object {
               "type": "all_columns_asterisk",
             },
@@ -642,13 +643,15 @@ Array [
                 "text": "foo",
                 "type": "identifier",
               },
+              "operator": ".",
               "property": Object {
                 "quoted": false,
                 "text": "bar",
                 "type": "identifier",
               },
               "type": "property_access",
             },
+            "operator": ".",
             "property": Object {
               "quoted": false,
               "text": "baz",