/*

 * Copyright (c) 2007, 2014, 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 com.sun.tools.javap;

import java.io.PrintWriter;

import com.sun.tools.classfile.AttributeException;

import com.sun.tools.classfile.ConstantPoolException;

import com.sun.tools.classfile.DescriptorException;

/*

 *  A writer similar to a PrintWriter but which does not hide exceptions.

 *  The standard print calls are line-buffered; report calls write messages directly.

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class BasicWriter {

    protected BasicWriter(Context context) {

        lineWriter = LineWriter.instance(context);

        out = context.get(PrintWriter.class);

        messages = context.get(Messages.class);

        if (messages == null)

            throw new AssertionError();

    }

    protected void print(String s) {

        lineWriter.print(s);

    }

    protected void print(Object o) {

        lineWriter.print(o == null ? null : o.toString());

    }

    protected void println() {

        lineWriter.println();

    }

    protected void println(String s) {

        lineWriter.print(s);

        lineWriter.println();

    }

    protected void println(Object o) {

        lineWriter.print(o == null ? null : o.toString());

        lineWriter.println();

    }

    protected void indent(int delta) {

        lineWriter.indent(delta);

    }

    protected void tab() {

        lineWriter.tab();

    }

    protected void setPendingNewline(boolean b) {

        lineWriter.pendingNewline = b;

    }

    protected String report(AttributeException e) {

        out.println("Error: " + e.getMessage()); // i18n?

        return "???";

    }

    protected String report(ConstantPoolException e) {

        out.println("Error: " + e.getMessage()); // i18n?

        return "???";

    }

    protected String report(DescriptorException e) {

        out.println("Error: " + e.getMessage()); // i18n?

        return "???";

    }

    protected String report(String msg) {

        out.println("Error: " + msg); // i18n?

        return "???";

    }

    protected String space(int w) {

        if (w < spaces.length && spaces[w] != null)

            return spaces[w];

        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < w; i++)

            sb.append(" ");

        String s = sb.toString();

        if (w < spaces.length)

            spaces[w] = s;

        return s;

    }

    private String[] spaces = new String[80];

    private LineWriter lineWriter;

    private PrintWriter out;

    protected Messages messages;

    private static class LineWriter {

        static LineWriter instance(Context context) {

            LineWriter instance = context.get(LineWriter.class);

            if (instance == null)

                instance = new LineWriter(context);

            return instance;

        }

        protected LineWriter(Context context) {

            context.put(LineWriter.class, this);

            Options options = Options.instance(context);

            indentWidth = options.indentWidth;

            tabColumn = options.tabColumn;

            out = context.get(PrintWriter.class);

            buffer = new StringBuilder();

        }

        protected void print(String s) {

            if (pendingNewline) {

                println();

                pendingNewline = false;

            }

            if (s == null)

                s = "null";

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

                char c = s.charAt(i);

                switch (c) {

                    case ' ':

                        pendingSpaces++;

                        break;

                    case '\n':

                        println();

                        break;

                    default:

                        if (buffer.length() == 0)

                            indent();

                        if (pendingSpaces > 0) {

                            for (int sp = 0; sp < pendingSpaces; sp++)

                                buffer.append(' ');

                            pendingSpaces = 0;

                        }

                        buffer.append(c);

                }

            }

        }

        protected void println() {

            // ignore/discard pending spaces

            pendingSpaces = 0;

            out.println(buffer);

            buffer.setLength(0);

        }

        protected void indent(int delta) {

            indentCount += delta;

        }

        protected void tab() {

            int col = indentCount * indentWidth + tabColumn;

            pendingSpaces += (col <= buffer.length() ? 1 : col - buffer.length());

        }

        private void indent() {

            pendingSpaces += (indentCount * indentWidth);

        }

        private final PrintWriter out;

        private final StringBuilder buffer;

        private int indentCount;

        private final int indentWidth;

        private final int tabColumn;

        private boolean pendingNewline;

        private int pendingSpaces;

    }

}