/**
* Finds a closing parenthesis to the left of <code>position</code> in document, where that
* parenthesis is only separated by whitespace from <code>position</code>. If no such parenthesis
* can be found, <code>position</code> is returned.
*
* @param scanner the java heuristic scanner set up on the document
* @param position the first character position in <code>document</code> to be considered
* @return the position of a closing parenthesis left to <code>position</code> separated only by
* whitespace, or <code>position</code> if no parenthesis can be found
*/
private static int findClosingParenToLeft(JavaHeuristicScanner scanner, int position) {
if (position < 1) return position;
if (scanner.previousToken(position - 1, JavaHeuristicScanner.UNBOUND) == Symbols.TokenRPAREN)
return scanner.getPosition() + 1;
return position;
}
/**
* Skips the scope opened by <code>token</code>.
*
* @param scanner the scanner
* @param start the start position
* @param token the token
* @return the position after the scope or <code>JavaHeuristicScanner.NOT_FOUND</code>
*/
private static int skipScope(JavaHeuristicScanner scanner, int start, int token) {
int openToken = token;
int closeToken;
switch (token) {
case Symbols.TokenLPAREN:
closeToken = Symbols.TokenRPAREN;
break;
case Symbols.TokenLBRACKET:
closeToken = Symbols.TokenRBRACKET;
break;
case Symbols.TokenLBRACE:
closeToken = Symbols.TokenRBRACE;
break;
default:
Assert.isTrue(false);
return -1; // dummy
}
int depth = 1;
int p = start;
while (true) {
int tok = scanner.nextToken(p, JavaHeuristicScanner.UNBOUND);
p = scanner.getPosition();
if (tok == openToken) {
depth++;
} else if (tok == closeToken) {
depth--;
if (depth == 0) return p + 1;
} else if (tok == Symbols.TokenEOF) {
return JavaHeuristicScanner.NOT_FOUND;
}
}
}
private int getPeerPosition(IDocument document, DocumentCommand command) {
if (document.getLength() == 0) return 0;
/*
* Search for scope closers in the pasted text and find their opening peers
* in the document.
*/
Document pasted = new Document(command.text);
installJavaStuff(pasted);
int firstPeer = command.offset;
JavaHeuristicScanner pScanner = new JavaHeuristicScanner(pasted);
JavaHeuristicScanner dScanner = new JavaHeuristicScanner(document);
// add scope relevant after context to peer search
int afterToken =
dScanner.nextToken(command.offset + command.length, JavaHeuristicScanner.UNBOUND);
try {
switch (afterToken) {
case Symbols.TokenRBRACE:
pasted.replace(pasted.getLength(), 0, "}"); // $NON-NLS-1$
break;
case Symbols.TokenRPAREN:
pasted.replace(pasted.getLength(), 0, ")"); // $NON-NLS-1$
break;
case Symbols.TokenRBRACKET:
pasted.replace(pasted.getLength(), 0, "]"); // $NON-NLS-1$
break;
}
} catch (BadLocationException e) {
// cannot happen
Assert.isTrue(false);
}
int pPos = 0; // paste text position (increasing from 0)
int dPos = Math.max(0, command.offset - 1); // document position (decreasing from paste offset)
while (true) {
int token = pScanner.nextToken(pPos, JavaHeuristicScanner.UNBOUND);
pPos = pScanner.getPosition();
switch (token) {
case Symbols.TokenLBRACE:
case Symbols.TokenLBRACKET:
case Symbols.TokenLPAREN:
pPos = skipScope(pScanner, pPos, token);
if (pPos == JavaHeuristicScanner.NOT_FOUND) return firstPeer;
break; // closed scope -> keep searching
case Symbols.TokenRBRACE:
int peer = dScanner.findOpeningPeer(dPos, '{', '}');
dPos = peer - 1;
if (peer == JavaHeuristicScanner.NOT_FOUND) return firstPeer;
firstPeer = peer;
break; // keep searching
case Symbols.TokenRBRACKET:
peer = dScanner.findOpeningPeer(dPos, '[', ']');
dPos = peer - 1;
if (peer == JavaHeuristicScanner.NOT_FOUND) return firstPeer;
firstPeer = peer;
break; // keep searching
case Symbols.TokenRPAREN:
peer = dScanner.findOpeningPeer(dPos, '(', ')');
dPos = peer - 1;
if (peer == JavaHeuristicScanner.NOT_FOUND) return firstPeer;
firstPeer = peer;
break; // keep searching
case Symbols.TokenCASE:
case Symbols.TokenDEFAULT:
JavaIndenter indenter = new JavaIndenter(document, dScanner, fProject);
peer = indenter.findReferencePosition(dPos, false, false, false, true);
if (peer == JavaHeuristicScanner.NOT_FOUND) return firstPeer;
firstPeer = peer;
break; // keep searching
case Symbols.TokenEOF:
return firstPeer;
default:
// keep searching
}
}
}
