private Directive parseDirective(final StringBuilder buffer, final ParserCursor cursor) {
Parameter parameter = parseParameter(buffer, cursor, ALL_DELIMITERS);
List<Parameter> params = Collections.emptyList();
if (!cursor.atEnd()) {
char ch = buffer.charAt(cursor.getPos() - 1);
if (ch != ELEM_DELIMITER) {
params = parseParameters(buffer, cursor);
}
}
if (parameter instanceof QuotedParameter) {
return createDirective(
parameter.getName(), ((QuotedParameter) parameter).getQuotedValue(), params);
}
return createDirective(parameter.getName(), parameter.getValue(), params);
}
private List<Parameter> parseParameters(final StringBuilder buffer, final ParserCursor cursor) {
if (buffer == null) {
throw new IllegalArgumentException("Char array buffer may not be null");
}
if (cursor == null) {
throw new IllegalArgumentException("Parser cursor may not be null");
}
int pos = cursor.getPos();
int indexTo = cursor.getUpperBound();
while (pos < indexTo) {
char ch = buffer.charAt(pos);
if (isWhitespace(ch)) {
pos++;
} else {
break;
}
}
cursor.updatePos(pos);
if (cursor.atEnd()) {
return Collections.emptyList();
}
List<Parameter> params = new ArrayList<Parameter>();
while (!cursor.atEnd()) {
params.add(parseParameter(buffer, cursor, ALL_DELIMITERS));
char ch = buffer.charAt(cursor.getPos() - 1);
if (ch == ELEM_DELIMITER) {
break;
}
}
return params;
}
private Parameter parseParameter(
final StringBuilder buffer, final ParserCursor cursor, final char[] delimiters) {
if (buffer == null) {
throw new IllegalArgumentException("Char array buffer may not be null");
}
if (cursor == null) {
throw new IllegalArgumentException("Parser cursor may not be null");
}
boolean terminated = false;
int pos = cursor.getPos();
int indexFrom = cursor.getPos();
int indexTo = cursor.getUpperBound();
// Find name
String name = null;
while (pos < indexTo) {
char ch = buffer.charAt(pos);
if (ch == '=') {
break;
}
if (isOneOf(ch, delimiters)) {
terminated = true;
break;
}
pos++;
}
if (pos == indexTo) {
terminated = true;
name = buffer.substring(indexFrom, indexTo).trim();
} else {
name = buffer.substring(indexFrom, pos).trim();
pos++;
}
if (terminated) {
cursor.updatePos(pos);
int i = name.indexOf('<');
int j = name.indexOf('>');
if (i != -1 && j != -1) { // this is a Link header
return createParameter(HeaderConstants.LINK_HEADER, name.substring(i + 1, j));
}
return createParameter(name, null);
}
// Find value
String value = null;
int i1 = pos;
boolean qouted = false;
boolean escaped = false;
while (pos < indexTo) {
char ch = buffer.charAt(pos);
if (ch == '"' && !escaped) {
qouted = !qouted;
}
if (!qouted && !escaped && isOneOf(ch, delimiters)) {
terminated = true;
break;
}
if (escaped) {
escaped = false;
} else {
escaped = qouted && ch == '\\';
}
pos++;
}
int i2 = pos;
// Trim leading white spaces
while (i1 < i2 && (isWhitespace(buffer.charAt(i1)))) {
i1++;
}
// Trim trailing white spaces
while ((i2 > i1) && (isWhitespace(buffer.charAt(i2 - 1)))) {
i2--;
}
value = buffer.substring(i1, i2);
if (terminated) {
pos++;
}
cursor.updatePos(pos);
return createParameter(name, value);
}