Mercurial Hosting > luan
view core/src/luan/modules/parsers/ParseException.java @ 585:bb3818249dfb
add Parsers
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 14 Aug 2015 06:35:20 -0600 |
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package luan.modules.parsers; public final class ParseException extends Exception { public final String text; public final int errorIndex; public final int highIndex; ParseException(Parser parser,String msg) { super(msg); this.text = parser.text; this.errorIndex = parser.currentIndex(); this.highIndex = parser.highIndex(); } private class Location { final int line; final int pos; Location(int index) { int line = 0; int i = -1; while(true) { int j = text.indexOf('\n',i+1); if( j == -1 || j >= index ) break; i = j; line++; } this.line = line; this.pos = index - i - 1; } } private String[] lines() { return text.split("\n",-1); } @Override public String getMessage() { Location loc = new Location(errorIndex); String line = lines()[loc.line]; String msg = super.getMessage() + " (line " + (loc.line+1) + ", pos " + (loc.pos+1) + ")\n"; StringBuilder sb = new StringBuilder(msg); sb.append( line + "\n" ); for( int i=0; i<loc.pos; i++ ) { sb.append( line.charAt(i)=='\t' ? '\t' : ' ' ); } sb.append("^\n"); return sb.toString(); } }