/**
* Parses and returns a number.
*
* @param cmd referring command; if specified, the result must not be empty
* @return name
* @throws QueryException query exception
*/
private String number(final Cmd cmd) throws QueryException {
consumeWS();
final StringBuilder sb = new StringBuilder();
if (parser.curr() == '-') sb.append(parser.consume());
while (digit(parser.curr())) sb.append(parser.consume());
return finish(eoc() || ws(parser.curr()) ? sb : null, cmd);
}
/**
* Parses and returns the specified keyword.
*
* @param key token to be parsed
* @param cmd referring command; if specified, the keyword is mandatory
* @return result of check
* @throws QueryException query exception
*/
private boolean key(final String key, final Cmd cmd) throws QueryException {
consumeWS();
final int p = parser.pos;
final boolean ok =
(parser.consume(key) || parser.consume(key.toLowerCase(Locale.ENGLISH)))
&& (parser.curr(0) || ws(parser.curr()));
if (!ok) {
parser.pos = p;
if (cmd != null) throw help(null, cmd);
}
return ok;
}
/**
* Parses and returns a command. A command is limited to letters.
*
* @param cmd referring command; if specified, the result must not be empty
* @return name
* @throws QueryException query exception
*/
private String command(final Cmd cmd) throws QueryException {
consumeWS();
final StringBuilder sb = new StringBuilder();
while (!eoc() && !ws(parser.curr())) {
sb.append(parser.consume());
}
return finish(sb, cmd);
}
/**
* Parses and returns a glob expression, which extends {@link #name(Cmd)} function with asterisks,
* question marks and commands.
*
* @param cmd referring command; if specified, the result must not be empty
* @return glob expression
* @throws QueryException query exception
*/
private String glob(final Cmd cmd) throws QueryException {
consumeWS();
final StringBuilder sb = new StringBuilder();
while (true) {
final char ch = parser.curr();
if (!Databases.validChar(ch) && ch != '*' && ch != '?' && ch != ',') {
return finish(eoc() || ws(ch) ? sb : null, cmd);
}
sb.append(parser.consume());
}
}
/**
* Parses and returns a string, delimited by a semicolon or, optionally, a space. Quotes can be
* used to include spaces.
*
* @param cmd referring command; if specified, the result must not be empty
* @param space stop when encountering space
* @return string
* @throws QueryException query exception
*/
private String string(final Cmd cmd, final boolean space) throws QueryException {
final StringBuilder sb = new StringBuilder();
consumeWS();
boolean q = false;
while (parser.more()) {
final char c = parser.curr();
if (!q && ((space ? c <= ' ' : c < ' ') || eoc())) break;
if (c == '"') q ^= true;
else sb.append(c);
parser.consume();
}
return finish(sb, cmd);
}
/**
* Checks if the end of a command has been reached.
*
* @return true if command has ended
*/
private boolean eoc() {
return !parser.more() || parser.curr() == ';';
}
/**
* Parses and returns a name. A name may contain letters, numbers and any of the special
* characters <code>!#$%&'()+-=@[]^_`{}~</code>.
*
* @param cmd referring command; if specified, the result must not be empty
* @return name
* @throws QueryException query exception
*/
private String name(final Cmd cmd) throws QueryException {
consumeWS();
final StringBuilder sb = new StringBuilder();
while (Databases.validChar(parser.curr())) sb.append(parser.consume());
return finish(eoc() || ws(parser.curr()) ? sb : null, cmd);
}
