private static Collection<String> suggestKeywords(PsiElement position) {
TextRange posRange = position.getTextRange();
BnfFile posFile = (BnfFile) position.getContainingFile();
BnfRule statement = PsiTreeUtil.getTopmostParentOfType(position, BnfRule.class);
final TextRange range;
if (statement != null) {
range = new TextRange(statement.getTextRange().getStartOffset(), posRange.getStartOffset());
} else {
int offset = posRange.getStartOffset();
for (PsiElement cur = GrammarUtil.getDummyAwarePrevSibling(position);
cur != null;
cur = GrammarUtil.getDummyAwarePrevSibling(cur)) {
if (cur instanceof BnfAttrs) offset = cur.getTextRange().getEndOffset();
else if (cur instanceof BnfRule) offset = cur.getTextRange().getStartOffset();
else continue;
break;
}
range = new TextRange(offset, posRange.getStartOffset());
}
final String text =
range.isEmpty()
? CompletionInitializationContext.DUMMY_IDENTIFIER
: range.substring(posFile.getText());
PsiFile file =
PsiFileFactory.getInstance(posFile.getProject())
.createFileFromText("a.bnf", BnfLanguage.INSTANCE, text, true, false);
int completionOffset = posRange.getStartOffset() - range.getStartOffset();
GeneratedParserUtilBase.CompletionState state =
new GeneratedParserUtilBase.CompletionState(completionOffset) {
@Override
public String convertItem(Object o) {
// we do not have other keywords
return o instanceof String ? (String) o : null;
}
};
file.putUserData(GeneratedParserUtilBase.COMPLETION_STATE_KEY, state);
TreeUtil.ensureParsed(file.getNode());
return state.items;
}
@NotNull
@Override
public FoldingDescriptor[] buildFoldRegions(
@NotNull PsiElement root, @NotNull Document document, boolean quick) {
if (!(root instanceof BnfFile)) return FoldingDescriptor.EMPTY;
BnfFile file = (BnfFile) root;
final ArrayList<FoldingDescriptor> result = new ArrayList<FoldingDescriptor>();
for (BnfAttrs attrs : file.getAttributes()) {
TextRange textRange = attrs.getTextRange();
if (textRange.getLength() <= 2) continue;
result.add(new FoldingDescriptor(attrs, textRange));
}
for (BnfRule rule : file.getRules()) {
// result.add(new FoldingDescriptor(rule, rule.getTextRange()));
BnfAttrs attrs = rule.getAttrs();
if (attrs != null) {
result.add(new FoldingDescriptor(attrs, attrs.getTextRange()));
}
}
if (!quick) {
PsiTreeUtil.processElements(
file,
new PsiElementProcessor() {
@Override
public boolean execute(@NotNull PsiElement element) {
if (element.getNode().getElementType() == BnfParserDefinition.BNF_BLOCK_COMMENT) {
result.add(new FoldingDescriptor(element, element.getTextRange()));
}
return true;
}
});
}
return result.toArray(new FoldingDescriptor[result.size()]);
}