/*

 * Copyright (c) 2014, 2015, 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.jshell;

import java.util.stream.Stream;

import java.util.stream.StreamSupport;

import javax.lang.model.element.Name;

import static jdk.internal.jshell.remote.RemoteCodes.DOIT_METHOD_NAME;

import static jdk.internal.jshell.remote.RemoteCodes.prefixPattern;

/**

 * Assorted shared utilities.

 * @author Robert Field

 */

class Util {

    static final String REPL_CLASS_PREFIX = "$REPL";

    static final String REPL_DOESNOTMATTER_CLASS_NAME = REPL_CLASS_PREFIX+"00DOESNOTMATTER";

    static boolean isDoIt(Name name) {

        return isDoIt(name.toString());

    }

    static boolean isDoIt(String sname) {

        return sname.equals(DOIT_METHOD_NAME);

    }

    static String expunge(String s) {

        StringBuilder sb = new StringBuilder();

        for (String comp : prefixPattern.split(s)) {

            sb.append(comp);

        }

        return sb.toString();

    }

    static String asLetters(int i) {

        if (i == 0) {

            return "";

        }

        char buf[] = new char[33];

        int charPos = 32;

        i = -i;

        while (i <= -26) {

            buf[charPos--] = (char) ('A'-(i % 26));

            i = i / 26;

        }

        buf[charPos] = (char) ('A'-i);

        return new String(buf, charPos, (33 - charPos));

    }

    static String trimEnd(String s) {

        int last = s.length() - 1;

        int i = last;

        while (i >= 0 && Character.isWhitespace(s.charAt(i))) {

            --i;

        }

        if (i != last) {

            return s.substring(0, i + 1);

        } else {

            return s;

        }

    }

    static <T> Stream<T> stream(Iterable<T> iterable) {

        return StreamSupport.stream(iterable.spliterator(), false);

    }

    static class Pair<T, U> {

        final T first;

        final U second;

        Pair(T first, U second) {

            this.first = first;

            this.second = second;

        }

    }

}