public String toString(Token t) {
if (t.getKind().hasPayload()) {
return t.stringValue();
} else {
return t.kind.toString().toLowerCase();
}
}
/**
* Eat an identifier, possibly qualified (meaning that it is dotted). TODO AndyC Could create
* complete identifiers (a.b.c) here rather than a sequence of them? (a, b, c)
*/
private SpelNodeImpl eatPossiblyQualifiedId() {
LinkedList<SpelNodeImpl> qualifiedIdPieces = new LinkedList<SpelNodeImpl>();
Token node = peekToken();
while (isValidQualifiedId(node)) {
nextToken();
if (node.kind != TokenKind.DOT) {
qualifiedIdPieces.add(new Identifier(node.stringValue(), toPos(node)));
}
node = peekToken();
}
if (qualifiedIdPieces.isEmpty()) {
if (node == null) {
raiseInternalException(expressionString.length(), SpelMessage.OOD);
}
raiseInternalException(
node.startpos,
SpelMessage.NOT_EXPECTED_TOKEN,
"qualified ID",
node.getKind().toString().toLowerCase());
}
int pos =
toPos(
qualifiedIdPieces.getFirst().getStartPosition(),
qualifiedIdPieces.getLast().getEndPosition());
return new QualifiedIdentifier(
pos, qualifiedIdPieces.toArray(new SpelNodeImpl[qualifiedIdPieces.size()]));
}
private boolean peekIdentifierToken(String identifierString) {
if (!moreTokens()) {
return false;
}
Token t = peekToken();
return t.kind == TokenKind.IDENTIFIER && t.stringValue().equalsIgnoreCase(identifierString);
}
private boolean isValidQualifiedId(Token node) {
if (node == null || node.kind == TokenKind.LITERAL_STRING) {
return false;
}
if (node.kind == TokenKind.DOT || node.kind == TokenKind.IDENTIFIER) {
return true;
}
String value = node.stringValue();
return StringUtils.hasLength(value) && VALID_QUALIFIED_ID_PATTERN.matcher(value).matches();
}
private boolean maybeEatNullReference() {
if (peekToken(TokenKind.IDENTIFIER)) {
Token nullToken = peekToken();
if (!nullToken.stringValue().equalsIgnoreCase("null")) {
return false;
}
nextToken();
constructedNodes.push(new NullLiteral(toPos(nullToken)));
return true;
}
return false;
}
// relationalOperator
// : EQUAL | NOT_EQUAL | LESS_THAN | LESS_THAN_OR_EQUAL | GREATER_THAN
// | GREATER_THAN_OR_EQUAL | INSTANCEOF | BETWEEN | MATCHES
private Token maybeEatRelationalOperator() {
Token t = peekToken();
if (t == null) {
return null;
}
if (t.isNumericRelationalOperator()) {
return t;
}
if (t.isIdentifier()) {
String idString = t.stringValue();
if (idString.equalsIgnoreCase("instanceof")) {
return t.asInstanceOfToken();
} else if (idString.equalsIgnoreCase("matches")) {
return t.asMatchesToken();
} else if (idString.equalsIgnoreCase("between")) {
return t.asBetweenToken();
}
}
return null;
}
private boolean maybeEatTypeReference() {
if (peekToken(TokenKind.IDENTIFIER)) {
Token typeName = peekToken();
if (!typeName.stringValue().equals("T")) {
return false;
}
nextToken();
eatToken(TokenKind.LPAREN);
SpelNodeImpl node = eatPossiblyQualifiedId();
// dotted qualified id
// Are there array dimensions?
int dims = 0;
while (peekToken(TokenKind.LSQUARE, true)) {
eatToken(TokenKind.RSQUARE);
dims++;
}
eatToken(TokenKind.RPAREN);
constructedNodes.push(new TypeReference(toPos(typeName), node, dims));
return true;
}
return false;
}
// parse: @beanname @'bean.name'
// quoted if dotted
private boolean maybeEatBeanReference() {
if (peekToken(TokenKind.BEAN_REF)) {
Token beanRefToken = nextToken();
Token beanNameToken = null;
String beanname = null;
if (peekToken(TokenKind.IDENTIFIER)) {
beanNameToken = eatToken(TokenKind.IDENTIFIER);
beanname = beanNameToken.data;
} else if (peekToken(TokenKind.LITERAL_STRING)) {
beanNameToken = eatToken(TokenKind.LITERAL_STRING);
beanname = beanNameToken.stringValue();
beanname = beanname.substring(1, beanname.length() - 1);
} else {
raiseInternalException(beanRefToken.startpos, SpelMessage.INVALID_BEAN_REFERENCE);
}
BeanReference beanReference = new BeanReference(toPos(beanNameToken), beanname);
constructedNodes.push(beanReference);
return true;
}
return false;
}