1/*
2 * Copyright (c) 2014, 2016, 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 jdk.jshell;
27
28import java.util.ArrayList;
29import java.util.Arrays;
30import java.util.List;
31import java.util.Locale;
32import java.util.regex.Pattern;
33import java.util.stream.Stream;
34import java.util.stream.StreamSupport;
35import javax.lang.model.element.Name;
36
37/**
38 * Assorted shared utilities and constants.
39 */
40class Util {
41
42    /**
43     * The package name of all wrapper classes.
44     */
45    static final String REPL_PACKAGE = "REPL";
46
47    /**
48     * The prefix for all wrapper class names.
49     */
50    static final String REPL_CLASS_PREFIX = "$JShell$";
51
52    /**
53     * The name of the invoke method.
54     */
55    static final String DOIT_METHOD_NAME = "do_it$";
56
57    /**
58     * A pattern matching the full or simple class name of a wrapper class.
59     */
60    static final Pattern PREFIX_PATTERN = Pattern.compile(
61            "(" + REPL_PACKAGE + "\\.)?"
62            + "(?<class>" + Pattern.quote(REPL_CLASS_PREFIX)
63            + "\\w+" + ")" + "[\\$\\.]?");
64
65    static final String REPL_DOESNOTMATTER_CLASS_NAME = REPL_CLASS_PREFIX + "DOESNOTMATTER";
66
67    static final Locale PARSED_LOCALE = Locale.ROOT;
68
69    static boolean isDoIt(Name name) {
70        return isDoIt(name.toString());
71    }
72
73    static boolean isDoIt(String sname) {
74        return sname.equals(DOIT_METHOD_NAME);
75    }
76
77    static String expunge(String s) {
78        StringBuilder sb = new StringBuilder();
79        for (String comp : PREFIX_PATTERN.split(s)) {
80            sb.append(comp);
81        }
82        return sb.toString();
83    }
84
85    static String asLetters(int i) {
86        if (i == 0) {
87            return "";
88        }
89
90        char buf[] = new char[33];
91        int charPos = 32;
92
93        i = -i;
94        while (i <= -26) {
95            buf[charPos--] = (char) ('A'-(i % 26));
96            i = i / 26;
97        }
98        buf[charPos] = (char) ('A'-i);
99
100        return new String(buf, charPos, (33 - charPos));
101    }
102
103
104    static String trimEnd(String s) {
105        int last = s.length() - 1;
106        int i = last;
107        while (i >= 0 && Character.isWhitespace(s.charAt(i))) {
108            --i;
109        }
110        if (i != last) {
111            return s.substring(0, i + 1);
112        } else {
113            return s;
114        }
115    }
116
117    static <T> Stream<T> stream(Iterable<T> iterable) {
118        return StreamSupport.stream(iterable.spliterator(), false);
119    }
120
121    static String[] join(String[] a1, String[] a2) {
122        List<String> result = new ArrayList<>();
123
124        result.addAll(Arrays.asList(a1));
125        result.addAll(Arrays.asList(a2));
126
127        return result.toArray(new String[0]);
128    }
129
130    static class Pair<T, U> {
131        final T first;
132        final U second;
133
134        Pair(T first, U second) {
135            this.first = first;
136            this.second = second;
137        }
138    }
139}
140