private void insertNewlineWithAutoIndent(JTextComponent text) {
try {
int caretPos = text.getCaretPosition();
StyledDocument doc = (StyledDocument) text.getDocument();
Element map = doc.getDefaultRootElement();
int lineNum = map.getElementIndex(caretPos);
Element line = map.getElement(lineNum);
int start = line.getStartOffset();
int end = line.getEndOffset() - 1;
int len = end - start;
String s = doc.getText(start, len);
String leadingWS = PythonIndentation.getLeadingWhitespace(doc, start, caretPos - start);
StringBuffer sb = new StringBuffer("\n");
sb.append(leadingWS);
// TODO better control over automatic indentation
indentationLogic.checkIndent(leadingWS, lineNum + 1);
// If there is only whitespace between the caret and
// the EOL, pressing Enter auto-indents the new line to
// the same place as the previous line.
int nonWhitespacePos = PythonIndentation.atEndOfLine(doc, caretPos, start, s, len);
if (nonWhitespacePos == -1) {
if (leadingWS.length() == len) {
// If the line was nothing but whitespace, select it
// so its contents get removed.
text.setSelectionStart(start);
} else {
// Select the whitespace between the caret and the EOL
// to remove it
text.setSelectionStart(caretPos);
}
text.setSelectionEnd(end);
text.replaceSelection(sb.toString());
// auto-indentation for python statements like if, while, for, try,
// except, def, class and auto-deindentation for break, continue,
// pass, return
analyseDocument(doc, lineNum, indentationLogic);
// auto-completion: add colon if it is obvious
if (indentationLogic.shouldAddColon()) {
doc.insertString(caretPos, ":", null);
indentationLogic.setLastLineEndsWithColon();
}
int lastLineChange = indentationLogic.shouldChangeLastLineIndentation();
int nextLineChange = indentationLogic.shouldChangeNextLineIndentation();
if (lastLineChange != 0) {
Debug.log(5, "change line %d indentation by %d columns", lineNum + 1, lastLineChange);
changeIndentation((DefaultStyledDocument) doc, lineNum, lastLineChange);
// nextLineChange was determined based on indentation of last line before
// the change
nextLineChange += lastLineChange;
}
if (nextLineChange != 0) {
Debug.log(5, "change line %d indentation by %d columns", lineNum + 2, nextLineChange);
changeIndentation((DefaultStyledDocument) doc, lineNum + 1, nextLineChange);
}
} // If there is non-whitespace between the caret and the
// EOL, pressing Enter takes that text to the next line
// and auto-indents it to the same place as the last
// line. Additional auto-indentation or dedentation for
// specific python statements is only done for the next line.
else {
text.setCaretPosition(nonWhitespacePos);
doc.insertString(nonWhitespacePos, sb.toString(), null);
analyseDocument(doc, lineNum, indentationLogic);
int nextLineChange = indentationLogic.shouldChangeNextLineIndentation();
if (nextLineChange != 0) {
Debug.log(5, "change line %d indentation by %d columns", lineNum + 2, nextLineChange);
changeIndentation((DefaultStyledDocument) doc, lineNum + 1, nextLineChange);
}
}
} catch (BadLocationException ble) {
text.replaceSelection("\n");
Debug.error(me + "Problem while inserting new line with auto-indent\n%s", ble.getMessage());
}
}
