/**
* Calculates number of unmatched left braces before the given offset.
*
* @param editor target editor
* @param offset target offset
* @param fileType target file type
* @return number of unmatched braces before the given offset; negative value if it's not possible
* to perform the calculation or if there are no unmatched left braces before the given offset
*/
protected static int getUnmatchedLBracesNumberBefore(
Editor editor, int offset, FileType fileType) {
if (offset == 0) {
return -1;
}
CharSequence chars = editor.getDocument().getCharsSequence();
if (chars.charAt(offset - 1) != '{') {
return -1;
}
EditorHighlighter highlighter = ((EditorEx) editor).getHighlighter();
HighlighterIterator iterator = highlighter.createIterator(offset - 1);
BraceMatcher braceMatcher = BraceMatchingUtil.getBraceMatcher(fileType, iterator);
if (!braceMatcher.isLBraceToken(iterator, chars, fileType)
|| !braceMatcher.isStructuralBrace(iterator, chars, fileType)) {
return -1;
}
Language language = iterator.getTokenType().getLanguage();
iterator = highlighter.createIterator(0);
int lBracesBeforeOffset = 0;
int lBracesAfterOffset = 0;
int rBracesBeforeOffset = 0;
int rBracesAfterOffset = 0;
for (; !iterator.atEnd(); iterator.advance()) {
IElementType tokenType = iterator.getTokenType();
if (!tokenType.getLanguage().equals(language)
|| !braceMatcher.isStructuralBrace(iterator, chars, fileType)) {
continue;
}
boolean beforeOffset = iterator.getStart() < offset;
if (braceMatcher.isLBraceToken(iterator, chars, fileType)) {
if (beforeOffset) {
lBracesBeforeOffset++;
} else {
lBracesAfterOffset++;
}
} else if (braceMatcher.isRBraceToken(iterator, chars, fileType)) {
if (beforeOffset) {
rBracesBeforeOffset++;
} else {
rBracesAfterOffset++;
}
}
}
return lBracesBeforeOffset - rBracesBeforeOffset - (rBracesAfterOffset - lBracesAfterOffset);
}
protected boolean handleBackspace(
Editor editor, Caret caret, DataContext dataContext, boolean toWordStart) {
Project project = CommonDataKeys.PROJECT.getData(dataContext);
if (project == null) return false;
PsiFile file = PsiUtilBase.getPsiFileInEditor(editor, project);
if (file == null) return false;
if (editor.getSelectionModel().hasSelection()) return false;
int offset = editor.getCaretModel().getOffset() - 1;
if (offset < 0) return false;
CharSequence chars = editor.getDocument().getCharsSequence();
char c = chars.charAt(offset);
final Editor injectedEditor =
TypedHandler.injectedEditorIfCharTypedIsSignificant(c, editor, file);
final Editor originalEditor = editor;
if (injectedEditor != editor) {
int injectedOffset = injectedEditor.getCaretModel().getOffset();
if (isOffsetInsideInjected(injectedEditor, injectedOffset)) {
file = PsiDocumentManager.getInstance(project).getPsiFile(injectedEditor.getDocument());
editor = injectedEditor;
offset = injectedOffset - 1;
}
}
final BackspaceHandlerDelegate[] delegates =
Extensions.getExtensions(BackspaceHandlerDelegate.EP_NAME);
if (!toWordStart) {
for (BackspaceHandlerDelegate delegate : delegates) {
delegate.beforeCharDeleted(c, file, editor);
}
}
FileType fileType = file.getFileType();
final QuoteHandler quoteHandler = TypedHandler.getQuoteHandler(file, editor);
HighlighterIterator hiterator = ((EditorEx) editor).getHighlighter().createIterator(offset);
boolean wasClosingQuote =
quoteHandler != null && quoteHandler.isClosingQuote(hiterator, offset);
myOriginalHandler.execute(originalEditor, caret, dataContext);
if (!toWordStart) {
for (BackspaceHandlerDelegate delegate : delegates) {
if (delegate.charDeleted(c, file, editor)) {
return true;
}
}
}
if (offset >= editor.getDocument().getTextLength()) return true;
chars = editor.getDocument().getCharsSequence();
if ((c == '(' || c == '[' || c == '{')
&& CodeInsightSettings.getInstance().AUTOINSERT_PAIR_BRACKET) {
char c1 = chars.charAt(offset);
if (c1 != getRightChar(c)) return true;
HighlighterIterator iterator = ((EditorEx) editor).getHighlighter().createIterator(offset);
BraceMatcher braceMatcher = BraceMatchingUtil.getBraceMatcher(fileType, iterator);
if (!braceMatcher.isLBraceToken(iterator, chars, fileType)
&& !braceMatcher.isRBraceToken(iterator, chars, fileType)) {
return true;
}
int rparenOffset =
BraceMatchingUtil.findRightmostRParen(iterator, iterator.getTokenType(), chars, fileType);
if (rparenOffset >= 0) {
iterator = ((EditorEx) editor).getHighlighter().createIterator(rparenOffset);
boolean matched = BraceMatchingUtil.matchBrace(chars, fileType, iterator, false);
if (matched) return true;
}
editor.getDocument().deleteString(offset, offset + 1);
} else if ((c == '"' || c == '\'' || c == '`')
&& CodeInsightSettings.getInstance().AUTOINSERT_PAIR_QUOTE) {
char c1 = chars.charAt(offset);
if (c1 != c) return true;
if (wasClosingQuote) return true;
HighlighterIterator iterator = ((EditorEx) editor).getHighlighter().createIterator(offset);
if (quoteHandler == null || !quoteHandler.isOpeningQuote(iterator, offset)) return true;
editor.getDocument().deleteString(offset, offset + 1);
}
return true;
}