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annotate core/src/luan/impl/ParseException.java @ 171:3dcb0f9bee82

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add core component git-svn-id: https://luan-java.googlecode.com/svn/trunk@172 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Sun, 22 Jun 2014 05:41:22 +0000
parents src/luan/impl/ParseException.java@4eaee12f6c65
children 859c0dedc8b6
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1 package luan.impl;
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3 import luan.LuanSource;
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6 public final class ParseException extends Exception {
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7 public final LuanSource src;
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8 public final int iCurrent;
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9 public final int iHigh;
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11 ParseException(String msg,LuanSource src,int iCurrent,int iHigh) {
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12 super(msg);
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13 this.src = src;
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14 this.iCurrent = iCurrent;
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15 this.iHigh = iHigh;
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16 //System.out.println("iCurrent = "+iCurrent);
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17 //System.out.println("iHigh = "+iHigh);
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18 }
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20 private class Location {
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21 final int line;
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22 final int pos;
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24 Location(int index) {
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25 int line = 0;
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26 int i = -1;
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27 while(true) {
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28 int j = src.text.indexOf('\n',i+1);
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29 if( j == -1 || j >= index )
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30 break;
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31 i = j;
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32 line++;
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33 }
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34 this.line = line;
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35 this.pos = index - i - 1;
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36 }
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37 }
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39 private String[] lines() {
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40 return src.text.split("\n",-1);
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41 }
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43 public String getFancyMessage() {
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44 Location loc = new Location(iCurrent);
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45 String line = lines()[loc.line];
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46 String msg = getMessage() + " (line " + (loc.line+1) + ", pos " + (loc.pos+1) + ") in " + src.name + "\n";
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47 StringBuilder sb = new StringBuilder(msg);
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48 sb.append( line + "\n" );
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49 for( int i=0; i<loc.pos; i++ ) {
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50 sb.append( line.charAt(i)=='\t' ? '\t' : ' ' );
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51 }
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52 sb.append("^\n");
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53 return sb.toString();
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54 }
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55 }