/**
* Throws a parse exception that matches the specified look-ahead
* set. This method will take into account any initial matching
* tokens in the look-ahead set.
*
* @param set the look-ahead set to match
*
* @throws ParseException always thrown by this method
*/
private void ThrowParseException(LookAheadSet set)
{
Token token;
ArrayList list = new ArrayList();
int[] initials;
// Read tokens until mismatch
while (set.IsNext(this, 1))
{
set = set.CreateNextSet(NextToken().Id);
}
// Find next token descriptions
initials = set.GetInitialTokens();
for (int i = 0; i < initials.Length; i++)
{
list.Add(GetTokenDescription(initials[i]));
}
// Create exception
token = NextToken();
throw new ParseException(ParseException.ErrorType.UNEXPECTED_TOKEN,
token.ToShortString(),
list,
token.StartLine,
token.StartColumn);
}
/**
* Throws a parser creation exception for an ambiguity. The
* specified look-ahead set contains the token conflicts to be
* reported.
*
* @param pattern the production pattern name
* @param location the production pattern location, or null
* @param set the look-ahead set with conflicts
*
* @throws ParserCreationException always thrown by this method
*/
private void ThrowAmbiguityException(string pattern,
string location,
LookAheadSet set)
{
ArrayList list = new ArrayList();
int[] initials;
// Find next token descriptions
initials = set.GetInitialTokens();
for (int i = 0; i < initials.Length; i++)
{
list.Add(GetTokenDescription(initials[i]));
}
// Create exception
throw new ParserCreationException(
ParserCreationException.ErrorType.INHERENT_AMBIGUITY,
pattern,
location,
list);
}
/**
* Throws a parser creation exception for an ambiguity. The
* specified look-ahead set contains the token conflicts to be
* reported.
*
* @param pattern the production pattern name
* @param location the production pattern location, or null
* @param set the look-ahead set with conflicts
*
* @throws ParserCreationException always thrown by this method
*/
private void ThrowAmbiguityException(string pattern,
string location,
LookAheadSet set) {
ArrayList list = new ArrayList();
int[] initials;
// Find next token descriptions
initials = set.GetInitialTokens();
for (int i = 0; i < initials.Length; i++) {
list.Add(GetTokenDescription(initials[i]));
}
// Create exception
throw new ParserCreationException(
ParserCreationException.ErrorType.INHERENT_AMBIGUITY,
pattern,
location,
list);
}
/**
* Throws a parse exception that matches the specified look-ahead
* set. This method will take into account any initial matching
* tokens in the look-ahead set.
*
* @param set the look-ahead set to match
*
* @throws ParseException always thrown by this method
*/
private void ThrowParseException(LookAheadSet set) {
Token token;
ArrayList list = new ArrayList();
int[] initials;
// Read tokens until mismatch
while (set.IsNext(this, 1)) {
set = set.CreateNextSet(NextToken().Id);
}
// Find next token descriptions
initials = set.GetInitialTokens();
for (int i = 0; i < initials.Length; i++) {
list.Add(GetTokenDescription(initials[i]));
}
// Create exception
token = NextToken();
throw new ParseException(ParseException.ErrorType.UNEXPECTED_TOKEN,
token.ToShortString(),
list,
token.StartLine,
token.StartColumn);
}
