/*

 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.internal.jimage.decompressor;

import java.util.ArrayList;

import java.util.List;

/**

 *

 * A descriptor parser used to extract java type strings from

 * UTF_8 descriptors.

 *

 * @implNote This class needs to maintain JDK 8 source compatibility.

 *

 * It is used internally in the JDK to implement jimage/jrtfs access,

 * but also compiled and delivered as part of the jrtfs.jar to support access

 * to the jimage file provided by the shipped JDK by tools running on JDK 8.

 */

public class SignatureParser {

   public static class ParseResult {

        public final List<String> types = new ArrayList<>();

        public String formatted;

        private ParseResult() {}

    }

    private SignatureParser() {}

    public static String reconstruct(String formatted, List<String> arguments) {

        int arg_index = 0;

        char[] chars = formatted.toCharArray();

        StringBuilder out = new StringBuilder();

        for (int i = 0; i < chars.length; i++) {

            char c = chars[i];

            out.append(c);

            switch (c) {

                case 'L': {

                    String pkg = arguments.get(arg_index);

                    if(pkg.length() > 0) {

                        out.append(pkg).append("/");

                    }

                    arg_index+=1;

                    out.append(arguments.get(arg_index));

                    arg_index+=1;

                    break;

                }

                default: {

                    break;

                }

            }

        }

        return out.toString();

    }

    public static ParseResult parseSignatureDescriptor(String str) {

        ParseResult res = new ParseResult();

        char[] chars = str.toCharArray();

        StringBuilder type = null;

        StringBuilder formatted = new StringBuilder();

        for (int i = 0; i < chars.length; i++) {

            char c = chars[i];

            switch (c) {

                case ';':

                case ':':

                case '<': {

                    if(type != null) {

                        String fullName = type.toString();

                        int endIndex = fullName.lastIndexOf("/");

                        String clazz = fullName;

                        String pkg = "";

                        if(endIndex != -1) {

                            pkg = fullName.substring(0, endIndex);

                            clazz = fullName.substring(endIndex+1);

                        }

                        res.types.add(pkg);

                        res.types.add(clazz);

                    }

                    formatted.append(c);

                    type = null;

                    break;

                }

                case 'L': {

                    if(type == null) {

                        type = new StringBuilder();

                        formatted.append(c);

                    } else {

                        type.append(c);

                    }

                    break;

                }

                default: {

                    if(type == null) {

                        formatted.append(c);

                    } else {

                        type.append(c);

                    }

                    break;

                }

            }

        }

        res.formatted = formatted.toString();

        return res;

    }

}