1/*
2 * Copyright (c) 2007, 2014, 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
26package com.sun.tools.javap;
27
28import java.io.PrintWriter;
29
30import com.sun.tools.classfile.AttributeException;
31import com.sun.tools.classfile.ConstantPoolException;
32import com.sun.tools.classfile.DescriptorException;
33
34/*
35 *  A writer similar to a PrintWriter but which does not hide exceptions.
36 *  The standard print calls are line-buffered; report calls write messages directly.
37 *
38 *  <p><b>This is NOT part of any supported API.
39 *  If you write code that depends on this, you do so at your own risk.
40 *  This code and its internal interfaces are subject to change or
41 *  deletion without notice.</b>
42 */
43public class BasicWriter {
44    protected BasicWriter(Context context) {
45        lineWriter = LineWriter.instance(context);
46        out = context.get(PrintWriter.class);
47        messages = context.get(Messages.class);
48        if (messages == null)
49            throw new AssertionError();
50    }
51
52    protected void print(String s) {
53        lineWriter.print(s);
54    }
55
56    protected void print(Object o) {
57        lineWriter.print(o == null ? null : o.toString());
58    }
59
60    protected void println() {
61        lineWriter.println();
62    }
63
64    protected void println(String s) {
65        lineWriter.print(s);
66        lineWriter.println();
67    }
68
69    protected void println(Object o) {
70        lineWriter.print(o == null ? null : o.toString());
71        lineWriter.println();
72    }
73
74    protected void indent(int delta) {
75        lineWriter.indent(delta);
76    }
77
78    protected void tab() {
79        lineWriter.tab();
80    }
81
82    protected void setPendingNewline(boolean b) {
83        lineWriter.pendingNewline = b;
84    }
85
86    protected String report(AttributeException e) {
87        out.println("Error: " + e.getMessage()); // i18n?
88        return "???";
89    }
90
91    protected String report(ConstantPoolException e) {
92        out.println("Error: " + e.getMessage()); // i18n?
93        return "???";
94    }
95
96    protected String report(DescriptorException e) {
97        out.println("Error: " + e.getMessage()); // i18n?
98        return "???";
99    }
100
101    protected String report(String msg) {
102        out.println("Error: " + msg); // i18n?
103        return "???";
104    }
105
106    protected String space(int w) {
107        if (w < spaces.length && spaces[w] != null)
108            return spaces[w];
109
110        StringBuilder sb = new StringBuilder();
111        for (int i = 0; i < w; i++)
112            sb.append(" ");
113
114        String s = sb.toString();
115        if (w < spaces.length)
116            spaces[w] = s;
117
118        return s;
119    }
120
121    private String[] spaces = new String[80];
122
123    private LineWriter lineWriter;
124    private PrintWriter out;
125    protected Messages messages;
126
127    private static class LineWriter {
128        static LineWriter instance(Context context) {
129            LineWriter instance = context.get(LineWriter.class);
130            if (instance == null)
131                instance = new LineWriter(context);
132            return instance;
133        }
134
135        protected LineWriter(Context context) {
136            context.put(LineWriter.class, this);
137            Options options = Options.instance(context);
138            indentWidth = options.indentWidth;
139            tabColumn = options.tabColumn;
140            out = context.get(PrintWriter.class);
141            buffer = new StringBuilder();
142        }
143
144        protected void print(String s) {
145            if (pendingNewline) {
146                println();
147                pendingNewline = false;
148            }
149            if (s == null)
150                s = "null";
151            for (int i = 0; i < s.length(); i++) {
152                char c = s.charAt(i);
153                switch (c) {
154                    case ' ':
155                        pendingSpaces++;
156                        break;
157
158                    case '\n':
159                        println();
160                        break;
161
162                    default:
163                        if (buffer.length() == 0)
164                            indent();
165                        if (pendingSpaces > 0) {
166                            for (int sp = 0; sp < pendingSpaces; sp++)
167                                buffer.append(' ');
168                            pendingSpaces = 0;
169                        }
170                        buffer.append(c);
171                }
172            }
173
174        }
175
176        protected void println() {
177            // ignore/discard pending spaces
178            pendingSpaces = 0;
179            out.println(buffer);
180            buffer.setLength(0);
181        }
182
183        protected void indent(int delta) {
184            indentCount += delta;
185        }
186
187        protected void tab() {
188            int col = indentCount * indentWidth + tabColumn;
189            pendingSpaces += (col <= buffer.length() ? 1 : col - buffer.length());
190        }
191
192        private void indent() {
193            pendingSpaces += (indentCount * indentWidth);
194        }
195
196        private final PrintWriter out;
197        private final StringBuilder buffer;
198        private int indentCount;
199        private final int indentWidth;
200        private final int tabColumn;
201        private boolean pendingNewline;
202        private int pendingSpaces;
203    }
204}
205
206