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annotate 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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17066
0bcefb0f8488 Truffle: byte[] sources.
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.source;
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26
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27 import java.nio.charset.*;
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28 import java.util.*;
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29
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30 /**
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31 * For a language where strings do not map into Java strings, provides utilities to find line
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32 * endings and to decode raw bytes into an approximate representation for tools to display.
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33 * <p>
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34 * See {@link Source#fromBytes}.
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35 */
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36 public interface BytesDecoder {
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37
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38 String decode(byte[] bytes, int byteIndex, int length);
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39
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40 void decodeLines(byte[] bytes, int byteIndex, int length, LineMarker lineMarker);
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41
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42 public interface LineMarker {
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43
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44 void markLine(int index);
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45
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46 }
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47
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48 public static class UTF8BytesDecoder implements BytesDecoder {
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49
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50 @Override
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51 public String decode(byte[] bytes, int byteIndex, int length) {
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52 return new String(Arrays.copyOfRange(bytes, byteIndex, byteIndex + length), StandardCharsets.UTF_8);
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53 }
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54
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55 @Override
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56 public void decodeLines(byte[] bytes, int byteIndex, int length, LineMarker lineMarker) {
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57 for (int n = byteIndex; n < byteIndex + length; n++) {
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58 if (bytes[n] == '\n') {
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59 lineMarker.markLine(n + 1);
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60 }
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61 }
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62 }
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63
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64 }
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65
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66 }