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585
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1 package luan.modules.parsers;
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2
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3
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4 public final class ParseException extends Exception {
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5 public final String text;
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6 public final int errorIndex;
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7 public final int highIndex;
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8
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9 ParseException(Parser parser,String msg) {
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10 super(msg);
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11 this.text = parser.text;
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12 this.errorIndex = parser.currentIndex();
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13 this.highIndex = parser.highIndex();
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14 }
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15
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16 private class Location {
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17 final int line;
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18 final int pos;
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19
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20 Location(int index) {
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21 int line = 0;
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22 int i = -1;
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23 while(true) {
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24 int j = text.indexOf('\n',i+1);
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25 if( j == -1 || j >= index )
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26 break;
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27 i = j;
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28 line++;
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29 }
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30 this.line = line;
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31 this.pos = index - i - 1;
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32 }
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33 }
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34
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35 private String[] lines() {
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36 return text.split("\n",-1);
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37 }
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38
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39 @Override public String getMessage() {
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40 Location loc = new Location(errorIndex);
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41 String line = lines()[loc.line];
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42 String msg = super.getMessage() + " (line " + (loc.line+1) + ", pos " + (loc.pos+1) + ")\n";
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43 StringBuilder sb = new StringBuilder(msg);
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44 sb.append( line + "\n" );
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45 for( int i=0; i<loc.pos; i++ ) {
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46 sb.append( line.charAt(i)=='\t' ? '\t' : ' ' );
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47 }
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48 sb.append("^\n");
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49 return sb.toString();
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50 }
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51 }
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