private void skipComments() throws ParseException, IOException {
while (true) {
int firstChar = 0, middleChar = 0;
skipWhiteSpace();
try {
firstChar = input.read();
} catch (IOException e) {
throw new ParseException(0);
}
if ((char) firstChar != '{') {
try {
input.unread(firstChar);
} catch (IOException e) {
throw new ParseException(0);
}
break;
}
do {
try {
middleChar = input.read();
} catch (IOException e) {
throw new ParseException(0);
}
if ((char) middleChar == '{' || middleChar == -1 || middleChar == EOF_RETURN) {
throw new ParseException(1);
}
} while ((char) middleChar != '}');
}
}
public void nextLex() throws ParseException, IOException {
token = "";
char currentChar;
int currentCharAsInt;
skipComments();
skipWhiteSpace();
try {
currentCharAsInt = input.read();
} catch (IOException e1) {
throw new ParseException(0);
}
currentChar = (char) currentCharAsInt;
if (currentCharAsInt == -1 || currentCharAsInt == EOF_RETURN) {
token = "<eof>";
tokenType = endOfInput;
} else if (Character.isDigit(currentChar)) {
tokenType = intToken; // by default
token = token + currentChar;
while (true) {
try {
currentChar = (char) input.read();
} catch (IOException e) {
throw new ParseException(0);
}
if (Character.isDigit(currentChar)) {
token = token + currentChar;
} else if (currentChar == '.') {
if (token.indexOf('.') == -1) {
tokenType = realToken;
token = token + currentChar;
} else {
try {
input.unread(currentChar);
} catch (IOException e) {
throw new ParseException(0);
}
break;
}
} else {
try {
input.unread(currentChar);
} catch (IOException e) {
throw new ParseException(0);
}
break;
}
}
} else if (Character.isLetter(currentChar)) {
token = token + currentChar;
while (true) {
try {
currentChar = (char) input.read();
} catch (IOException e) {
throw new ParseException(0);
}
if (Character.isLetterOrDigit(currentChar)) {
token = token + currentChar;
} else {
input.unread(currentChar);
tokenType = identifierToken;
for (String current : keywords) {
if (match(current)) {
tokenType = keywordToken;
break;
}
}
break;
}
}
} else {
switch (currentChar) {
case '"':
tokenType = stringToken;
while (true) {
try {
currentCharAsInt = input.read();
currentChar = (char) currentCharAsInt;
} catch (IOException e) {
throw new ParseException(0);
}
if (currentCharAsInt == -1 || currentCharAsInt == EOF_RETURN) {
throw new ParseException(2);
} else if (currentChar == '"') {
break;
}
token = token + currentChar;
}
break;
case '<':
tokenType = otherToken;
token = token + currentChar;
char secondChar = (char) input.read();
if (secondChar == '<') {
token = token + secondChar;
break;
} else {
input.unread(secondChar);
}
case '>':
case '=':
case '!':
tokenType = otherToken;
if (currentChar != '<') {
token = token + currentChar;
}
secondChar = (char) input.read();
if (secondChar == '=') {
token = token + secondChar;
break;
} else {
input.unread(secondChar);
}
break;
default:
token = Character.toString(currentChar);
tokenType = otherToken;
}
}
return;
}
