Unparse new library syntax.

dart/lib/compiler/implementation/scanner/parser.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * An event generating parser of Dart programs. This parser expects
  * all tokens in a linked list (aka a token stream).
  *
  * The class [Scanner] is used to generate a token stream. See the
  * file scanner.dart.
@@ skipping 13 matching lines @@
  * matches, "star" means zero or more matches. For example,
  * [parseMetadataStar] corresponds to this grammar snippet: [:
  * metadata* :], and [parseTypeOpt] corresponds to: [: type? :].
  */
 class Parser {
   final Listener listener;
   bool mayParseFunctionExpressions = true;
 
   Parser(this.listener);
 
-  void parseUnit(Token token) {
+  Token parseUnit(Token token) {
+    listener.beginCompilationUnit(token);
+    int count = 0;
     while (token.kind !== EOF_TOKEN) {
       token = parseTopLevelDeclaration(token);
+      count++;
     }
+    listener.endCompilationUnit(count, token);
+    return token;
   }
 
   Token parseTopLevelDeclaration(Token token) {
     token = parseMetadataStar(token);
     final String value = token.stringValue;
     if (value === 'interface') {
       return parseInterface(token);
     } else if ((value === 'abstract') || (value === 'class')) {
       return parseClass(token);
     } else if (value === 'typedef') {
       return parseNamedFunctionAlias(token);
     } else if (value === '#') {
       return parseScriptTags(token);
     } else if (value === 'library') {
       return parseLibraryName(token);
     } else if (value === 'import') {
       return parseImport(token);
     } else if (value === 'export') {
       return parseExport(token);
+    } else if (value === 'part') {
+      return parsePartOrPartOf(token);
     } else {
       return parseTopLevelMember(token);
     }
   }
 
   /// library qualified ';'
   Token parseLibraryName(Token token) {
     Token libraryKeyword = token;
     listener.beginLibraryName(libraryKeyword);
     assert(optional('library', token));
-    token = parseIdentifier(token.next);
-    while (optional('.', token)) {
-      token = parseQualifiedRest(token);
-    }
+    token = parseQualified(token.next);
     Token semicolon = token;
     token = expect(';', token);
     listener.endLibraryName(libraryKeyword, semicolon);
     return token;
   }
 
   /// import uri (as identifier)? combinator* ';'
   Token parseImport(Token token) {
     Token importKeyword = token;
     listener.beginImport(importKeyword);
@@ skipping 67 matching lines @@
     token = parseIdentifier(token);
     int count = 1;
     while (optional(',', token)) {
       token = parseIdentifier(token.next);
       count++;
     }
     listener.endIdentifierList(count);
     return token;
   }
 
+  Token parsePartOrPartOf(Token token) {
+    assert(optional('part', token));
+    if (optional('of', token.next)) {
+      return parsePartOf(token);
+    } else {
+      return parsePart(token);
+    }
+  }
+
+  Token parsePart(Token token) {
+    Token partKeyword = token;
+    listener.beginPart(token);
+    assert(optional('part', token));
+    token = parseLiteralStringOrRecoverExpression(token.next);
+    Token semicolon = token;
+    token = expect(';', token);
+    listener.endPart(partKeyword, semicolon);
+    return token;
+  }
+
+  Token parsePartOf(Token token) {
+    listener.beginPartOf(token);
+    assert(optional('part', token));
+    assert(optional('of', token.next));
+    Token partKeyword = token;
+    token = parseQualified(token.next.next);
+    Token semicolon = token;
+    token = expect(';', token);
+    listener.endPartOf(partKeyword, semicolon);
+    return token;
+  }
+
   Token parseMetadataStar(Token token) {
     while (optional('@', token)) {
       token = parseMetadata(token);
     }
     return token;
   }
 
   /**
    * Parse
    * [: '@' qualified (‘.’ identifier)? (arguments)? :]
@@ skipping 167 matching lines @@
       token = parseIdentifier(token.next);
       token = parseQualifiedRestOpt(token);
       token = parseTypeVariablesOpt(token);
       listener.endDefaultClause(defaultKeyword);
     } else {
       listener.handleNoDefaultClause(token);
     }
     return token;
   }
 
+  Token parseQualified(Token token) {
+    token = parseIdentifier(token);
+    while (optional('.', token)) {
+      token = parseQualifiedRest(token);
+    }
+    return token;
+  }
+
   Token parseQualifiedRestOpt(Token token) {
     if (optional('.', token)) {
       return parseQualifiedRest(token);
     } else {
       return token;
     }
   }
 
   Token parseQualifiedRest(Token token) {
     assert(optional('.', token));
@@ skipping 1690 matching lines @@
     }
     listener.handleContinueStatement(hasTarget, continueKeyword, token);
     return expectSemicolon(token);
   }
 
   Token parseEmptyStatement(Token token) {
     listener.handleEmptyStatement(token);
     return expectSemicolon(token);
   }
 }