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comparison core/src/luan/modules/parsers/ParseException.java @ 585:bb3818249dfb

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add Parsers
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 14 Aug 2015 06:35:20 -0600
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584:0742ac78fa69 585:bb3818249dfb
1 package luan.modules.parsers;
2
3
4 public final class ParseException extends Exception {
5 public final String text;
6 public final int errorIndex;
7 public final int highIndex;
8
9 ParseException(Parser parser,String msg) {
10 super(msg);
11 this.text = parser.text;
12 this.errorIndex = parser.currentIndex();
13 this.highIndex = parser.highIndex();
14 }
15
16 private class Location {
17 final int line;
18 final int pos;
19
20 Location(int index) {
21 int line = 0;
22 int i = -1;
23 while(true) {
24 int j = text.indexOf('\n',i+1);
25 if( j == -1 || j >= index )
26 break;
27 i = j;
28 line++;
29 }
30 this.line = line;
31 this.pos = index - i - 1;
32 }
33 }
34
35 private String[] lines() {
36 return text.split("\n",-1);
37 }
38
39 @Override public String getMessage() {
40 Location loc = new Location(errorIndex);
41 String line = lines()[loc.line];
42 String msg = super.getMessage() + " (line " + (loc.line+1) + ", pos " + (loc.pos+1) + ")\n";
43 StringBuilder sb = new StringBuilder(msg);
44 sb.append( line + "\n" );
45 for( int i=0; i<loc.pos; i++ ) {
46 sb.append( line.charAt(i)=='\t' ? '\t' : ' ' );
47 }
48 sb.append("^\n");
49 return sb.toString();
50 }
51 }