/**
* Returns the next lexical token; if the token returned matches the given class (or is a
* subclass), then the scanner is advanced; if the token does not match, the scanner is not
* advanced.
*
* @throws ParserException if something bad or an intentional abort happens
*/
public ILexToken getToken(Class<?> clazz) throws ParserException {
ILexToken token = peekToken();
if (clazz.isAssignableFrom(token.getClass())) {
return getToken();
}
return token;
}
/**
* Reads and discards tokens until an unmatched right parenthesis or end-of-data is read
*
* @return the position of the right parenthesis or end-of-data
*/
public IPos skipThruRP() throws ParserException {
int n = 1;
ILexToken t;
while (!isEOD()) {
t = getToken();
if (!(t instanceof LexToken)) continue;
String s = ((LexToken) t).chars;
if (s == IPLexToken.LP) ++n;
if (s == IPLexToken.RP) {
--n;
if (n == 0) return t.pos();
}
}
return getToken().pos();
}
/** Returns the next token found in the given matcher, advancing the matcher */
protected ILexToken getToken(Matcher matcher) throws ParserException {
ILexToken token = null;
if (matcher.lookingAt()) {
prefixCommentText = null;
if (matcher.groupCount() >= 1 && matcher.end(1) != matcher.start(1)) {
prefixCommentText = matcher.group(1);
if (prefixCommentText.startsWith("\n")) prefixCommentText = prefixCommentText.substring(1);
else if (prefixCommentText.startsWith("\r\n"))
prefixCommentText = prefixCommentText.substring(2);
}
int end = matcher.end(2);
// System.out.println("MATCHED RANGE " + matcher.start() + " " + matcher.end() + " !" +
// matcher.group() + "!");
// for (int i=3; i<=matcher.groupCount(); i++) {
// if (matcher.group(i) != null) {
// System.out.println("MATCHED " + i + " RANGE " + matcher.start(i) + " " + matcher.end(i)
// + " !" + matcher.group(i) + "!" + (int)matcher.group(i).charAt(0));
// }
// }
int k;
IPos pos;
String matched = null;
if ((matched = matcher.group(k = 3)) != null) {
token = this.LP(matcher.start(k));
} else if ((matched = matcher.group(k = 4)) != null) {
token = this.RP(matcher.start(k));
} else if ((matched = matcher.group(k = 5)) != null) { // numeral
pos = pos(matcher.start(k), matcher.end(k));
// token = factory.numeral(matched,pos);
token = setPos(new LexNumeral(new BigInteger(matched)), pos);
end = matcher.end(k);
} else if ((matched = matcher.group(k = 6)) != null) { // simple symbol
pos = pos(matcher.start(k), matcher.end(k));
// token = factory.symbol(matched,pos);
token = setPos(new LexSymbol(matched), pos);
} else if ((matched = matcher.group(k = 8)) != null) { // bar-quoted symbol
pos = pos(matcher.start(k), matcher.end(k));
// token = factory.symbol(matched,pos);
token = setPos(new LexSymbol(matched), pos);
} else if ((matched = matcher.group(k = 7)) != null) { // string
// The match is just to the initial quote
int begin = matcher.start(k); // position of the initial quote
int p = begin;
try {
if (smtConfig.isVersion(SMT.Configuration.SMTLIB.V25)) { // Version 2.5ff
while (true) {
p++;
int c = csr.charAt(p);
if (c == '"') {
if (p + 1 < csr.length() && csr.charAt(p + 1) == '"') {
p++;
} else {
end = p + 1;
matched = csr.subSequence(begin, end).toString();
pos = pos(begin, end);
token = setPos(new LexStringLiteral(matched, true), pos);
break;
}
} else {
if (c >= ' ' && c <= '~') continue;
if (c == '\t' || c == '\r' || c == '\n') continue;
if (c == 25) {
end = p;
matched = csr.subSequence(begin, end).toString();
pos = pos(begin, end);
smtConfig.log.logError(
smtConfig.responseFactory.error(
"String literal is not terminated: " + matched, pos));
token = setPos(new LexError(matched), pos);
break; // End of data - no closing right paren
}
smtConfig.log.logError(
smtConfig.responseFactory.error(
"Invalid character: ASCII(decimal) = " + (int) c, pos(p, p + 1)));
continue;
}
}
} else if (SMT.Configuration.SMTLIB
.V20
.toString()
.equals(smtConfig.smtlib)) { // Version 2.0
while (true) {
p++;
int c = csr.charAt(p);
if (c == '\\') {
c = csr.charAt(++p);
// \\ is translated to \ and \" to "
// \x for anything else is just \x
// if (c == '\\' || c == '"') {
// continue;
// } else {
// smtConfig.log.logError(smtConfig.responseFactory.error("Invalid escape
// sequence " + (char)c + " (decimal ASCII = " + (int)c + ")",
// pos(p,p+1)));
// }
} else if (c == '"') {
end = p + 1;
matched = csr.subSequence(begin, end).toString();
pos = pos(begin, end);
token = setPos(new LexStringLiteral(matched, true), pos);
break;
} else {
if (c >= ' ' && c <= '~') continue;
if (c == '\t' || c == '\r' || c == '\n') continue;
if (c == 25) {
end = p;
matched = csr.subSequence(begin, end).toString();
pos = pos(begin, end);
smtConfig.log.logError(
smtConfig.responseFactory.error(
"String literal is not terminated: " + matched, pos));
token = setPos(new LexError(matched), pos);
break; // End of data - no closing right paren
}
smtConfig.log.logError(
smtConfig.responseFactory.error(
"Invalid character: ASCII(decimal) = " + (int) c, pos(p, p + 1)));
continue;
}
}
}
} catch (IndexOutOfBoundsException e) {
// If the CharSequence does not expand itself and does not terminate
// itself with an end of data character, and does not end with a
// quote character, we get this exception
end = p;
matched = csr.subSequence(begin, end).toString();
pos = pos(begin, end);
token = setPos(new LexError(matched), pos);
smtConfig.log.logError(
smtConfig.responseFactory.error(
"String literal is not terminated: " + matched, token.pos()));
}
} else if ((matched = matcher.group(k = 9)) != null) { // colon-initiated keyword
pos = pos(matcher.start(k), matcher.end(k));
// token = factory.keyword(matched,pos);
token = setPos(new LexKeyword(matched), pos);
} else if ((matched = matcher.group(k = 10)) != null) { // decimal
pos = pos(matcher.start(k), matcher.end(k));
// token = factory.decimal(matched,pos); // FIXME - use a factory everywhere?
token = setPos(new LexDecimal(new BigDecimal(matched)), pos);
end = matcher.end(k);
} else if ((matched = matcher.group(k = 11)) != null) {
pos = pos(matcher.start(k), matcher.end(k));
token = setPos(new LexBinaryLiteral(matcher.group(k + 1)), pos);
end = matcher.end(k);
} else if ((matched = matcher.group(k = 13)) != null) {
pos = pos(matcher.start(k), matcher.end(k));
token = setPos(new LexHexLiteral(matcher.group(k + 1)), pos);
end = matcher.end(k);
} else if ((matched = matcher.group(k = 15)) != null) {
pos = pos(matcher.start(k), matcher.end(k));
token = this.EOD(matcher.start(k));
} else if ((matched = matcher.group(k = 16)) != null) {
pos = pos(matcher.start(k), matcher.end(k));
// token = factory.error(matched,pos);
token = setPos(new LexError("Bar(|)-enclosed symbol is not terminated: " + matched), pos);
smtConfig.log.logError(
smtConfig.responseFactory.error(
"Bar(|)-enclosed symbol is not terminated: " + matched, token.pos()));
// matcher.region(end,csr.length());
// throw new SyntaxException("Invalid token: " + matched,token.pos());
} else if ((matched = matcher.group(k = 17)) != null) {
pos = pos(matcher.start(k), matcher.end(k));
// token = factory.error(matched,pos);
String msg = "Incorrect format for a number - no leading zeros allowed: ";
token = setPos(new LexError(msg + matched), pos);
smtConfig.log.logError(smtConfig.responseFactory.error(msg + matched, token.pos()));
end = matcher.end(k);
// matcher.region(end,csr.length());
// throw new SyntaxException("Leading zeros are not allowed: " + matched,token.pos());
} else if ((matched = matcher.group(k = 18)) != null) {
// This case no longer matches since we made a special case of string matching.
pos = pos(matcher.start(k), matcher.end(k));
// token = factory.error(matched,pos);
token = setPos(new LexError(matched), pos);
// smtConfig.log.logError(smtConfig.responseFactory.error("Invalid string: " + matched));
matcher.region(end, csr.length());
// FIXME - decide whether to throw exceptions or emit error messages and error tokens
throw new SyntaxException(("Invalid string: " + matched), token.pos());
} else if ((matched = matcher.group(k = 19)) != null) {
// System.out.println("Killed");
matcher.region(end, csr.length());
throw new AbortParseException();
} else if ((matched = matcher.group(k = 20)) != null) {
pos = pos(matcher.start(k), matcher.end(k));
// token = factory.error(matched,pos);
if (matched.charAt(0) < ' ')
matched = "(ASCII char " + (int) matched.charAt(0) + " (decimal))";
token = setPos(new LexError("Invalid token: " + matched), pos);
smtConfig.log.logError(smtConfig.responseFactory.error("Invalid token: " + matched, pos));
// matcher.region(end,csr.length());
// throw new SyntaxException("Invalid token: " + matched,token.pos());
// SMT.out.println(smtConfig.responseFactory.error("Invalid token: " + matched));
} else if ((matched = matcher.group(k = 21)) != null) {
// FIXME - This should never happen either - it is a stopgap hack, because
// with whitespace at the very beginning of a file, the whitespace detector is not finding
// it
matcher.region(end, csr.length());
return getToken();
} else {
// Nothing matched - this should not have happened.
// lookingAt should not have returned true if no group matched
// Check that all alternatives are represented in the cases above
int b = matcher.regionStart();
int e = matcher.regionEnd();
String s = csr.subSequence(b, e > b + 100 ? b + 100 : e).toString();
if (matcher.group(1) != null) end = matcher.end(1);
else end = matcher.end();
matcher.region(end > b ? end : b + 1, csr.length());
// String group = matcher.group();
throw new SMT.InternalException(
"Failed to report which regular expression matched: " + " " + b + " " + e + " " + s);
}
if (csr != null) matcher.region(end, csr.length());
} else {
// FIXME - there is a problem if we have spaces at the very beginning of a file, prior to the
// LP
// the matcher does not match???
int b = matcher.regionStart();
int e = matcher.regionEnd();
matcher.region(b + 1, e);
return getToken();
// Nothing matched - this should not have happened.
// There is an error in the regular expression, since it is not even
// reporting an error token.
// int n = matcher.groupCount();
// String gr = matcher.group(2);
// gr = matcher.group(1);
// gr = matcher.group(0);
// String s = csr.subSequence(b,e>b+100?b+100:e).toString();
// throw new SMT.InternalException("Failed to report any match: something is wrong with the
// regular expression used for parsing "
// + matcher.regionStart() + " " + matcher.regionEnd() + " " + s);
}
return token;
}
/** Returns true if the next token is a right parenthesis (without consuming it) */
public boolean isRP() throws ParserException {
ILexToken token = peekToken();
return (token.kind() == LexToken.RP);
}
