/**
* Returns the valid Java identifier in a document immediately before the given offset.
*
* @param document the document
* @param offset the offset at which to start looking
* @return the Java identifier preceding this location or a blank string if none
*/
private String lastWord(IDocument document, int offset) {
try {
for (int n = offset - 1; n >= 0; n--) {
char c = document.getChar(n);
if (!Character.isJavaIdentifierPart(c)) {
return document.get(n + 1, offset - n - 1);
}
}
return document.get(0, offset);
} catch (BadLocationException e) {
Activator.log(e);
}
return ""; //$NON-NLS-1$
}
@Override
public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int offset) {
try {
IDocument document = viewer.getDocument();
ArrayList<ICompletionProposal> result = new ArrayList<>();
// Search the list of keywords (case-insensitive)
String prefix = lastWord(document, offset).toLowerCase(Locale.ROOT);
for (QtProjectFileKeyword keyword : QtProjectFileKeyword.values()) {
if (prefix.isEmpty() || keyword.getKeyword().toLowerCase(Locale.ROOT).startsWith(prefix)) {
result.add(
new CompletionProposal(
keyword.getKeyword(),
offset - prefix.length(),
prefix.length(),
keyword.getKeyword().length()));
}
}
return result.toArray(new ICompletionProposal[result.size()]);
} catch (Exception e) {
Activator.log(e);
return NO_COMPLETIONS;
}
}