/*
 * Copyright (C) 2013-2014 The Project Lombok Authors.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package lombok.javac.java8;

import java.lang.reflect.Field;
import java.util.List;

import lombok.core.ReferenceFieldAugment;
import lombok.javac.CommentInfo;

import com.sun.tools.javac.main.JavaCompiler;
import com.sun.tools.javac.parser.JavacParser;
import com.sun.tools.javac.parser.Lexer;
import com.sun.tools.javac.parser.ParserFactory;
import com.sun.tools.javac.parser.ScannerFactory;
import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
import com.sun.tools.javac.util.Context;

public class CommentCollectingParserFactory extends ParserFactory {
	private final ReferenceFieldAugment<JCCompilationUnit, List<CommentInfo>> commentsField;
	private final Context context;
	
	static Context.Key<ParserFactory> key() {
		return parserFactoryKey;
	}
	
	protected CommentCollectingParserFactory(Context context, ReferenceFieldAugment<JCCompilationUnit, List<CommentInfo>> commentsField) {
		super(context);
		this.context = context;
		this.commentsField = commentsField;
	}
	
	public JavacParser newParser(CharSequence input, boolean keepDocComments, boolean keepEndPos, boolean keepLineMap) {
		ScannerFactory scannerFactory = ScannerFactory.instance(context);
		Lexer lexer = scannerFactory.newScanner(input, true);
		Object x = new CommentCollectingParser(this, lexer, true, keepLineMap, keepEndPos, commentsField);
		return (JavacParser) x;
		// CCP is based on a stub which extends nothing, but at runtime the stub is replaced with either
		//javac6's EndPosParser which extends Parser, or javac8's JavacParser which implements Parser.
		//Either way this will work out.
	}
	
	public static void setInCompiler(JavaCompiler compiler, Context context, ReferenceFieldAugment<JCCompilationUnit, List<CommentInfo>> commentsField) {
		context.put(CommentCollectingParserFactory.key(), (ParserFactory)null);
		Field field;
		try {
			field = JavaCompiler.class.getDeclaredField("parserFactory");
			field.setAccessible(true);
			field.set(compiler, new CommentCollectingParserFactory(context, commentsField));
		} catch (Exception e) {
			throw new IllegalStateException("Could not set comment sensitive parser in the compiler", e);
		}
	}
}