private static String getErrorMessage(BaseRecognizer recognizer, RecognitionException e) {
String[] tokenNames = recognizer.getTokenNames();
String hdr = "Line " + e.line + ":" + e.charPositionInLine;
String msg = recognizer.getErrorMessage(e, tokenNames);
return hdr + " " + msg;
}
private static InvalidExpressionException generateException(
String exp, BaseRecognizer antlr, RecognitionException re, Location l) {
StringBuilder errorMsg = new StringBuilder();
String[] names = antlr.getTokenNames();
if (re.token != null && re.token.getType() == ExpressionParser.EOF) {
errorMsg.append("unexpected end of expression");
} else if (re instanceof MismatchedTokenException) {
MismatchedTokenException mte = (MismatchedTokenException) re;
String txt;
String expecting;
// bleh same exception class has different fields set depending on
// where it occurred
if (antlr instanceof Lexer) {
Lexer lexer = (Lexer) antlr;
txt = lexer.getCharErrorDisplay(re.c);
expecting = lexer.getCharErrorDisplay(mte.expecting);
} else {
if (mte.token.getText() != null) {
txt = "'" + mte.token.getText() + "'";
} else {
txt = names[mte.token.getType()];
}
if (mte.expecting < names.length && mte.expecting >= 0) {
expecting = ExpressionParser.FRIENDLY_NAMES[mte.expecting];
} else {
expecting = null;
}
}
if (expecting != null) {
errorMsg.append("expecting ").append(expecting).append(", found ").append(txt);
} else {
errorMsg.append("unexpected token: ").append(txt);
}
} else if (re instanceof NoViableAltException) {
Token token = re.token;
if (token == null) {
char ch = exp.charAt(re.charPositionInLine);
if (re.charPositionInLine == 0 && ch == '{') {
errorMsg.append("unclosed brace");
} else {
errorMsg.append("unexpected token: ").append("'").append(ch).append("'");
}
} else {
errorMsg
.append("unexpected token: ")
.append(ExpressionParser.FRIENDLY_NAMES[token.getType()]);
}
} else {
errorMsg.append(antlr.getErrorMessage(re, names));
}
if (re.line > 1) {
errorMsg
.append(" at line ")
.append(re.line)
.append(", column ")
.append(re.charPositionInLine + 1);
} else {
errorMsg.append(" at column ").append(re.charPositionInLine + 1);
}
errorMsg.append(" of expression: ");
errorMsg.append(exp);
return new InvalidExpressionException(errorMsg.toString(), l);
}