public LDAPExpr parse(String strExpr) throws LDAPParseException {
if (strExpr == null || strExpr.trim().length() == 0) {
return LDAPExpr.ACCEPT_ALL;
}
ParseState ps = new ParseState(strExpr);
LDAPExpr expr = parseExpr(ps);
ps.skipWhitespace();
if (!ps.isEndOfString()) {
error("expected end of expression ", ps);
}
return expr;
}
private SimpleTerm parseSimple(ParseState ps) throws LDAPParseException {
// read name
StringBuffer name = new StringBuffer(16);
for (char c = ps.peek(); !ps.isEndOfString() && isNameChar(c); c = ps.peek()) {
ps.read();
name.append(c);
}
ps.skipWhitespace();
Ops op = null;
// read op
if (ps.lookingAt("=")) {
op = EQ;
ps.skip(1);
} else if (ps.lookingAt(">=")) {
op = GE;
ps.skip(2);
} else if (ps.lookingAt("<=")) {
op = LE;
ps.skip(2);
} else if (ps.lookingAt(">")) {
op = GT;
ps.skip(1);
} else if (ps.lookingAt("<")) {
op = LT;
ps.skip(1);
} else if (ps.lookingAt("-=")) {
op = APPROX;
ps.skip(2);
} else if (ps.isEndOfString()) {
error("unexpected end of expression", ps);
} else {
error("unexpected character: '" + ps.peek() + "'", ps);
}
ps.skipWhitespace();
boolean escaped = false;
StringBuffer value = new StringBuffer(16);
while (!ps.isEndOfString()
&& !Character.isWhitespace(ps.peek())
&& !(ps.peek() == ')' && !escaped)) {
char ch = ps.peek();
if (ch == '\\') {
escaped = true;
ps.read();
} else if (ch == '*') {
if (escaped) {
value.append(ch);
escaped = false;
} else {
value.append(SimpleTerm.WILDCARD);
}
ps.read();
} else if (isLiteralValue(ch)) {
if (escaped) {
error("incorrectly applied escape of '" + ch + "'", ps);
}
value.append(ps.read());
} else if (isEscapedValue(ch)) {
if (!escaped) {
error("missing escape for '" + ch + "'", ps);
}
value.append(ps.read());
escaped = false;
} else {
error("unexpected character: '" + ps.peek() + "'", ps);
}
}
ps.skipWhitespace();
SimpleTerm expr = new SimpleTerm(name.toString(), op, value.toString());
return expr;
}