001/*
002 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package jdk.internal.jvmci.options;
024
025import java.util.*;
026
027public class OptionUtils {
028
029    public interface OptionConsumer {
030        void set(OptionDescriptor desc, Object value);
031    }
032
033    /**
034     * Parses a given option value specification.
035     *
036     * @param option the specification of an option and its value
037     * @param setter the object to notify of the parsed option and value.
038     */
039    public static void parseOption(String option, OptionConsumer setter) {
040        SortedMap<String, OptionDescriptor> options = OptionsLoader.options;
041        Objects.requireNonNull(setter);
042        if (option.length() == 0) {
043            return;
044        }
045
046        Object value = null;
047        String optionName = null;
048        String valueString = null;
049
050        char first = option.charAt(0);
051        if (first == '+' || first == '-') {
052            optionName = option.substring(1);
053            value = (first == '+');
054        } else {
055            int index = option.indexOf('=');
056            if (index == -1) {
057                optionName = option;
058                valueString = null;
059            } else {
060                optionName = option.substring(0, index);
061                valueString = option.substring(index + 1);
062            }
063        }
064
065        OptionDescriptor desc = options.get(optionName);
066        if (desc == null) {
067            throw new IllegalArgumentException("Option '" + optionName + "' not found");
068        }
069
070        Class<?> optionType = desc.getType();
071
072        if (value == null) {
073            if (optionType == Boolean.TYPE || optionType == Boolean.class) {
074                throw new IllegalArgumentException("Boolean option '" + optionName + "' must use +/- prefix");
075            }
076
077            if (valueString == null) {
078                throw new IllegalArgumentException("Missing value for non-boolean option '" + optionName + "' must use " + optionName + "=<value> format");
079            }
080
081            if (optionType == Float.class) {
082                value = Float.parseFloat(valueString);
083            } else if (optionType == Double.class) {
084                value = Double.parseDouble(valueString);
085            } else if (optionType == Integer.class) {
086                value = Integer.valueOf((int) parseLong(valueString));
087            } else if (optionType == Long.class) {
088                value = Long.valueOf(parseLong(valueString));
089            } else if (optionType == String.class) {
090                value = valueString;
091            } else {
092                throw new IllegalArgumentException("Wrong value for option '" + optionName + "'");
093            }
094        } else {
095            if (optionType != Boolean.class) {
096                throw new IllegalArgumentException("Non-boolean option '" + optionName + "' can not use +/- prefix. Use " + optionName + "=<value> format");
097            }
098        }
099
100        setter.set(desc, value);
101    }
102
103    private static long parseLong(String v) {
104        String valueString = v.toLowerCase();
105        long scale = 1;
106        if (valueString.endsWith("k")) {
107            scale = 1024L;
108        } else if (valueString.endsWith("m")) {
109            scale = 1024L * 1024L;
110        } else if (valueString.endsWith("g")) {
111            scale = 1024L * 1024L * 1024L;
112        } else if (valueString.endsWith("t")) {
113            scale = 1024L * 1024L * 1024L * 1024L;
114        }
115
116        if (scale != 1) {
117            /* Remove trailing scale character. */
118            valueString = valueString.substring(0, valueString.length() - 1);
119        }
120
121        return Long.parseLong(valueString) * scale;
122    }
123
124    /**
125     * Wraps some given text to one or more lines of a given maximum width.
126     *
127     * @param text text to wrap
128     * @param width maximum width of an output line, exception for words in {@code text} longer than
129     *            this value
130     * @return {@code text} broken into lines
131     */
132    private static List<String> wrap(String text, int width) {
133        List<String> lines = Collections.singletonList(text);
134        if (text.length() > width) {
135            String[] chunks = text.split("\\s+");
136            lines = new ArrayList<>();
137            StringBuilder line = new StringBuilder();
138            for (String chunk : chunks) {
139                if (line.length() + chunk.length() > width) {
140                    lines.add(line.toString());
141                    line.setLength(0);
142                }
143                if (line.length() != 0) {
144                    line.append(' ');
145                }
146                String[] embeddedLines = chunk.split("%n", -2);
147                if (embeddedLines.length == 1) {
148                    line.append(chunk);
149                } else {
150                    for (int i = 0; i < embeddedLines.length; i++) {
151                        line.append(embeddedLines[i]);
152                        if (i < embeddedLines.length - 1) {
153                            lines.add(line.toString());
154                            line.setLength(0);
155                        }
156                    }
157                }
158            }
159            if (line.length() != 0) {
160                lines.add(line.toString());
161            }
162        }
163        return lines;
164    }
165
166    public static void printFlags(SortedMap<String, OptionDescriptor> options, String prefix) {
167        System.out.println("[List of " + prefix + " options]");
168        SortedMap<String, OptionDescriptor> sortedOptions = options;
169        for (Map.Entry<String, OptionDescriptor> e : sortedOptions.entrySet()) {
170            e.getKey();
171            OptionDescriptor desc = e.getValue();
172            Object value = desc.getOptionValue().getValue();
173            List<String> helpLines = wrap(desc.getHelp(), 70);
174            System.out.println(String.format("%9s %-40s = %-14s %s", desc.getType().getSimpleName(), e.getKey(), value, helpLines.get(0)));
175            for (int i = 1; i < helpLines.size(); i++) {
176                System.out.println(String.format("%67s %s", " ", helpLines.get(i)));
177            }
178        }
179
180        System.exit(0);
181    }
182}