/**
* Static service to get a term from its string representation, providing a specific operator
* manager
*/
public static Term parseSingleTerm(String st, OperatorManager op) throws InvalidTermException {
try {
Parser p = new Parser(op, st);
Token t = p.tokenizer.readToken();
if (t.isEOF()) throw new InvalidTermException("Term starts with EOF");
p.tokenizer.unreadToken(t);
Term term = p.expr(false);
if (term == null) throw new InvalidTermException("Term is null");
if (!p.tokenizer.readToken().isEOF())
throw new InvalidTermException("The entire string could not be read as one term");
term.resolveTerm();
return term;
} catch (IOException ex) {
throw new InvalidTermException("An I/O error occured");
}
}
/**
* Parses next term from the stream built on string.
*
* @param endNeeded <tt>true</tt> if it is required to parse the end token (a period),
* <tt>false</tt> otherwise.
* @throws InvalidTermException if a syntax error is found.
*/
public Term nextTerm(boolean endNeeded) throws InvalidTermException {
try {
Token t = tokenizer.readToken();
if (t.isEOF()) return null;
tokenizer.unreadToken(t);
Term term = expr(false);
if (term == null)
/*Castagna 06/2011*/
// throw new InvalidTermException("The parser is unable to finish");
throw new InvalidTermException(
"The parser is unable to finish.",
tokenizer.offsetToRowColumn(getCurrentOffset())[0],
tokenizer.offsetToRowColumn(getCurrentOffset())[1] - 1);
/**/
if (endNeeded && tokenizer.readToken().getType() != Tokenizer.END)
/*Castagna 06/2011*/
// throw new InvalidTermException("The term " + term + " is not ended with a period.");
throw new InvalidTermException(
"The term '" + term + "' is not ended with a period.",
tokenizer.offsetToRowColumn(getCurrentOffset())[0],
tokenizer.offsetToRowColumn(getCurrentOffset())[1] - 1);
/**/
term.resolveTerm();
return term;
} catch (IOException ex) {
/*Castagna 06/2011*/
// throw new InvalidTermException("An I/O error occured.");
throw new InvalidTermException(
"An I/O error occured.",
tokenizer.offsetToRowColumn(getCurrentOffset())[0],
tokenizer.offsetToRowColumn(getCurrentOffset())[1] - 1);
/**/
}
}