public synchronized boolean isIdentifier(String text, Project project) {
xPathLexer.start(text);
assert xPathLexer.getState() == 0;
boolean b = xPathLexer.getTokenType() == XPathTokenTypes.NCNAME;
xPathLexer.advance();
if (xPathLexer.getTokenType() == null) {
return b;
} else if (xPathLexer.getTokenType() == XPathTokenTypes.COL) {
xPathLexer.advance();
b = xPathLexer.getTokenType() == XPathTokenTypes.NCNAME;
xPathLexer.advance();
return b && xPathLexer.getTokenType() == null;
}
return false;
}
public XPathElement[] split(String path) {
ANTLRInputStream in;
try {
in = new ANTLRInputStream(new StringReader(path));
} catch (IOException ioe) {
throw new IllegalArgumentException("Could not read path: " + path, ioe);
}
XPathLexer lexer =
new XPathLexer(in) {
@Override
public void recover(LexerNoViableAltException e) {
throw e;
}
};
lexer.removeErrorListeners();
lexer.addErrorListener(new XPathLexerErrorListener());
CommonTokenStream tokenStream = new CommonTokenStream(lexer);
try {
tokenStream.fill();
} catch (LexerNoViableAltException e) {
int pos = lexer.getCharPositionInLine();
String msg = "Invalid tokens or characters at index " + pos + " in path '" + path + "'";
throw new IllegalArgumentException(msg, e);
}
List<Token> tokens = tokenStream.getTokens();
// System.out.println("path="+path+"=>"+tokens);
List<XPathElement> elements = new ArrayList<XPathElement>();
int n = tokens.size();
int i = 0;
loop:
while (i < n) {
Token el = tokens.get(i);
Token next = null;
switch (el.getType()) {
case XPathLexer.ROOT:
case XPathLexer.ANYWHERE:
boolean anywhere = el.getType() == XPathLexer.ANYWHERE;
i++;
next = tokens.get(i);
boolean invert = next.getType() == XPathLexer.BANG;
if (invert) {
i++;
next = tokens.get(i);
}
XPathElement pathElement = getXPathElement(next, anywhere);
pathElement.invert = invert;
elements.add(pathElement);
i++;
break;
case XPathLexer.TOKEN_REF:
case XPathLexer.RULE_REF:
case XPathLexer.WILDCARD:
elements.add(getXPathElement(el, false));
i++;
break;
case Token.EOF:
break loop;
default:
throw new IllegalArgumentException("Unknowth path element " + el);
}
}
return elements.toArray(new XPathElement[0]);
}