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1 /**
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2 * Copyright (c) Rich Hickey. All rights reserved.
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3 * The use and distribution terms for this software are covered by the
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4 * Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
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5 * which can be found in the file epl-v10.html at the root of this distribution.
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6 * By using this software in any fashion, you are agreeing to be bound by
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7 * the terms of this license.
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8 * You must not remove this notice, or any other, from this software.
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9 */
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10
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11 package clojure.lang;
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12
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13 import java.io.PushbackReader;
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14 import java.io.Reader;
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15 import java.io.LineNumberReader;
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16 import java.io.IOException;
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17
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18
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19 public class LineNumberingPushbackReader extends PushbackReader{
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20
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21 // This class is a PushbackReader that wraps a LineNumberReader. The code
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22 // here to handle line terminators only mentions '\n' because
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23 // LineNumberReader collapses all occurrences of CR, LF, and CRLF into a
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24 // single '\n'.
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25
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26 private static final int newline = (int) '\n';
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27
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28 private boolean _atLineStart = true;
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29 private boolean _prev;
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30
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31 public LineNumberingPushbackReader(Reader r){
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32 super(new LineNumberReader(r));
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33 }
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34
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35 public int getLineNumber(){
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36 return ((LineNumberReader) in).getLineNumber() + 1;
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37 }
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38
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39 public int read() throws IOException{
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40 int c = super.read();
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41 _prev = _atLineStart;
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42 _atLineStart = (c == newline) || (c == -1);
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43 return c;
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44 }
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45
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46 public void unread(int c) throws IOException{
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47 super.unread(c);
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48 _atLineStart = _prev;
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49 }
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50
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51 public String readLine() throws IOException{
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52 int c = read();
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53 String line;
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54 switch (c) {
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55 case -1:
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56 line = null;
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57 break;
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58 case newline:
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59 line = "";
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60 break;
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61 default:
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62 String first = String.valueOf((char) c);
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63 String rest = ((LineNumberReader)in).readLine();
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64 line = (rest == null) ? first : first + rest;
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65 _prev = false;
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66 _atLineStart = true;
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67 break;
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68 }
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69 return line;
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70 }
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71
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72 public boolean atLineStart(){
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73 return _atLineStart;
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74 }
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75 }
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