private boolean insertMatchingBrackets() {
final int start = textArea.getSelectionStart();
final int end = textArea.getSelectionEnd();
int endLineIndex = textArea.getLineOfOffset(end);
int suffixPosition = textArea.getLineEndOffsetBeforeTerminator(endLineIndex);
String beforeInsertion = textArea.getTextBuffer().subSequence(0, start).toString();
String afterInsertion =
textArea
.getTextBuffer()
.subSequence(suffixPosition, textArea.getTextBuffer().length())
.toString();
String unmatchedOpenBrackets = getUnmatchedBrackets(beforeInsertion);
String unmatchedCloseBrackets = getUnmatchedBrackets(afterInsertion);
String reflectedCloseBrackets = PBracketUtilities.reflectBrackets(unmatchedCloseBrackets);
if (unmatchedOpenBrackets.startsWith(reflectedCloseBrackets) == false) {
return false;
}
String closingBrackets =
PBracketUtilities.reflectBrackets(
unmatchedOpenBrackets.substring(reflectedCloseBrackets.length()));
if (closingBrackets.length() == 0) {
return false;
}
String startLine = getLineTextAtOffset(start);
if (closingBrackets.endsWith("}") == false
|| textArea.getIndenter().isInNeedOfClosingSemicolon(startLine)) {
// TODO: "closingBrackets" is a bad name now it can have a semicolon on the end!
closingBrackets = closingBrackets + ";";
}
String candidateBlockContents =
textArea.getTextBuffer().subSequence(end, suffixPosition).toString();
String commonEnding = getCommonEnding(candidateBlockContents, closingBrackets);
String whitespace = getIndentationOfLineAtOffset(start);
// TODO: The newline inserter has no business thinking it knows how to increase the indent.
String prefix = "\n" + whitespace + textArea.getIndentationString();
String suffix = "\n" + whitespace + closingBrackets;
final int newCaretPosition = start + prefix.length();
textArea.replaceSelection(prefix);
// suffixPosition is invalidated by replaceSelection.
// But we can't swap the calls because replaceRange clears the selection.
int selectionSize = end - start;
suffixPosition -= selectionSize;
suffixPosition += prefix.length();
textArea.replaceRange(suffix, suffixPosition - commonEnding.length(), suffixPosition);
textArea.select(newCaretPosition, newCaretPosition);
return true;
}
