/*
* Visit the AST expression and get the ParseTree Expression.
* This is used by the individual visits when parsing a tree.
* It passes to the top method (createExpression), which can
* handle the InvalidExpressionException.
*
* If any visit doesn't return an expression, then an invalid
* expression exception will be thrown to indicate this. If the
* incoming expression is <code>null</code>, then return of <code>null</code> is ok because
* this would be for an optional expression which didn't exist.
*
* @return The new ParseTree Expression or <code>null</code> if incoming expression was null.
*
* @see createExpression(org.eclipse.jdt.core.dom.Expression)
* @exception InvalidExpressionException
* @since 1.0.0
*/
protected final PTExpression perform(Expression astExpression) {
if (astExpression != null) {
expression = null;
astExpression.accept(this);
if (expression == null)
throw new InvalidExpressionException(
MessageFormat.format(
WorkbenchUtilityMessages.ParseTreeCreationFromAST_ExpressionTooComplicated_EXC_,
new Object[] {astExpression.toString()}));
return expression;
} else return null; // This is ok. It means an optional expression was being processed and the
// expression didn't exist.
}
/* (non-Javadoc)
* @see org.eclipse.jdt.core.dom.ASTVisitor#visit(org.eclipse.jdt.core.dom.ArrayAccess)
*/
public boolean visit(ArrayAccess node) {
PTArrayAccess aa = InstantiationFactory.eINSTANCE.createPTArrayAccess();
List indexes = aa.getIndexes();
Expression arrayExp = node;
while (arrayExp.getNodeType() == ASTNode.ARRAY_ACCESS) {
// Visit the index to get the index expression.
ArrayAccess array = (ArrayAccess) arrayExp;
indexes.add(
0,
perform(
array
.getIndex())); // We're trying to create the final expression from inside out, the
// indexes are created in reverse order.
arrayExp = array.getArray();
}
aa.setArray(perform(arrayExp)); // Final arrayExp is the true expression.
expression = aa; // Set the return expression for this visit.
return false;
}
/**
* Process the AST Expression and return a PTExpression. If any part was invalid, then only an
* PTInvalidExpression will be returned.
*
* @param astExpression
* @return The PTExpression.
* @since 1.0.0
*/
public final PTExpression createExpression(Expression astExpression) {
try {
return perform(astExpression);
} catch (InvalidExpressionException e) {
// Create a msg that is formed of the exception message and the full init string.
String msg =
MessageFormat.format(
WorkbenchUtilityMessages.ParseTreeCreationFromAST_0,
new Object[] {e.getLocalizedMessage(), astExpression.toString()});
PTInvalidExpression exp = InstantiationFactory.eINSTANCE.createPTInvalidExpression();
exp.setMessage(msg);
return exp;
}
}