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comparison graal/com.oracle.truffle.api/src/com/oracle/truffle/api/source/BytesDecoder.java @ 17066:0bcefb0f8488

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Truffle: byte[] sources.
author Chris Seaton <chris.seaton@oracle.com>
date Mon, 08 Sep 2014 22:21:21 +0100
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17062:a6277ae87f0e 17066:0bcefb0f8488
1 /*
2 * Copyright (c) 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 package com.oracle.truffle.api.source;
26
27 import java.nio.charset.*;
28 import java.util.*;
29
30 /**
31 * For a language where strings do not map into Java strings, provides utilities to find line
32 * endings and to decode raw bytes into an approximate representation for tools to display.
33 * <p>
34 * See {@link Source#fromBytes}.
35 */
36 public interface BytesDecoder {
37
38 String decode(byte[] bytes, int byteIndex, int length);
39
40 void decodeLines(byte[] bytes, int byteIndex, int length, LineMarker lineMarker);
41
42 public interface LineMarker {
43
44 void markLine(int index);
45
46 }
47
48 public static class UTF8BytesDecoder implements BytesDecoder {
49
50 @Override
51 public String decode(byte[] bytes, int byteIndex, int length) {
52 return new String(Arrays.copyOfRange(bytes, byteIndex, byteIndex + length), StandardCharsets.UTF_8);
53 }
54
55 @Override
56 public void decodeLines(byte[] bytes, int byteIndex, int length, LineMarker lineMarker) {
57 for (int n = byteIndex; n < byteIndex + length; n++) {
58 if (bytes[n] == '\n') {
59 lineMarker.markLine(n + 1);
60 }
61 }
62 }
63
64 }
65
66 }