1 /*
   2  * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.tools.javac.parser;
  27 
  28 import java.util.Locale;
  29 
  30 import com.sun.tools.javac.code.Source;
  31 import com.sun.tools.javac.tree.DocTreeMaker;
  32 import com.sun.tools.javac.tree.TreeMaker;
  33 import com.sun.tools.javac.util.Context;
  34 import com.sun.tools.javac.util.Log;
  35 import com.sun.tools.javac.util.Names;
  36 import com.sun.tools.javac.util.Options;
  37 
  38 /**
  39  * A factory for creating parsers.
  40  *
  41  * <p><b>This is NOT part of any supported API.
  42  * If you write code that depends on this, you do so at your own risk.
  43  * This code and its internal interfaces are subject to change or
  44  * deletion without notice.</b>
  45  */
  46 public class ParserFactory {
  47 
  48     /** The context key for the parser factory. */
  49     protected static final Context.Key<ParserFactory> parserFactoryKey = new Context.Key<>();
  50 
  51     public static ParserFactory instance(Context context) {
  52         ParserFactory instance = context.get(parserFactoryKey);
  53         if (instance == null) {
  54             instance = new ParserFactory(context);
  55         }
  56         return instance;
  57     }
  58 
  59     final TreeMaker F;
  60     final DocTreeMaker docTreeMaker;
  61     final Log log;
  62     final Tokens tokens;
  63     final Source source;
  64     final Names names;
  65     final Options options;
  66     final ScannerFactory scannerFactory;
  67     final Locale locale;
  68 
  69     protected ParserFactory(Context context) {
  70         super();
  71         context.put(parserFactoryKey, this);
  72         this.F = TreeMaker.instance(context);
  73         this.docTreeMaker = DocTreeMaker.instance(context);
  74         this.log = Log.instance(context);
  75         this.names = Names.instance(context);
  76         this.tokens = Tokens.instance(context);
  77         this.source = Source.instance(context);
  78         this.options = Options.instance(context);
  79         this.scannerFactory = ScannerFactory.instance(context);
  80         this.locale = context.get(Locale.class);
  81     }
  82 
  83     public JavacParser newParser(CharSequence input, boolean keepDocComments, boolean keepEndPos, boolean keepLineMap) {
  84         return newParser(input, keepDocComments, keepEndPos, keepLineMap, false);
  85     }
  86 
  87     public JavacParser newParser(CharSequence input, boolean keepDocComments, boolean keepEndPos, boolean keepLineMap, boolean parseModuleInfo) {
  88         Lexer lexer = scannerFactory.newScanner(input, keepDocComments);
  89         return new JavacParser(this, lexer, keepDocComments, keepLineMap, keepEndPos, parseModuleInfo);
  90     }
  91 }