private static IndentResult reuseOrCreateToken(IndentResult token, int numberOfLines) {
if (token == null) token = new IndentResult(new boolean[numberOfLines]);
else if (token.commentLinesAtColumnZero == null)
token.commentLinesAtColumnZero = new boolean[numberOfLines];
else if (token.commentLinesAtColumnZero.length != numberOfLines) {
boolean[] commentBooleans = new boolean[numberOfLines];
System.arraycopy(
token.commentLinesAtColumnZero,
0,
commentBooleans,
0,
Math.min(numberOfLines, token.commentLinesAtColumnZero.length));
token.commentLinesAtColumnZero = commentBooleans;
}
return token;
}
/**
* Shifts the line range specified by <code>lines</code> in <code>document</code>. The amount that
* the lines get shifted are determined by the first line in the range, all subsequent lines are
* adjusted accordingly. The passed Java project may be <code>null</code>, it is used solely to
* obtain formatter preferences.
*
* @param document the document to be changed
* @param lines the line range to be shifted
* @param project the Java project to get the formatter preferences from, or <code>null</code> if
* global preferences should be used
* @param result the result from a previous call to <code>shiftLines</code>, in order to maintain
* comment line properties, or <code>null</code>. Note that the passed result may be changed
* by the call.
* @return an indent result that may be queried for changes and can be reused in subsequent
* indentation operations
* @throws BadLocationException if <code>lines</code> is not a valid line range on <code>document
* </code>
*/
public static IndentResult shiftLines(
IDocument document, ILineRange lines, IJavaProject project, IndentResult result)
throws BadLocationException {
int numberOfLines = lines.getNumberOfLines();
if (numberOfLines < 1) return new IndentResult(null);
result = reuseOrCreateToken(result, numberOfLines);
result.hasChanged = false;
JavaHeuristicScanner scanner = new JavaHeuristicScanner(document);
JavaIndenter indenter = new JavaIndenter(document, scanner, project);
String current = getCurrentIndent(document, lines.getStartLine());
StringBuffer correct =
indenter.computeIndentation(document.getLineOffset(lines.getStartLine()));
if (correct == null) return result; // bail out
int tabSize = CodeFormatterUtil.getTabWidth(project);
StringBuffer addition = new StringBuffer();
int difference = subtractIndent(correct, current, addition, tabSize);
if (difference == 0) return result;
if (result.leftmostLine == -1) result.leftmostLine = getLeftMostLine(document, lines, tabSize);
int maxReduction =
computeVisualLength(
getCurrentIndent(document, result.leftmostLine + lines.getStartLine()), tabSize);
if (difference > 0) {
for (int line = lines.getStartLine(), last = line + numberOfLines, i = 0; line < last; line++)
addIndent(document, line, addition, result.commentLinesAtColumnZero, i++);
} else {
int reduction = Math.min(-difference, maxReduction);
for (int line = lines.getStartLine(), last = line + numberOfLines, i = 0; line < last; line++)
cutIndent(document, line, reduction, tabSize, result.commentLinesAtColumnZero, i++);
}
result.hasChanged = true;
return result;
}
/**
* Indents the line range specified by <code>lines</code> in <code>document</code>. The passed
* Java project may be <code>null</code>, it is used solely to obtain formatter preferences.
*
* @param document the document to be changed
* @param lines the line range to be indented
* @param project the Java project to get the formatter preferences from, or <code>null</code> if
* global preferences should be used
* @param result the result from a previous call to <code>indentLines</code>, in order to maintain
* comment line properties, or <code>null</code>. Note that the passed result may be changed
* by the call.
* @return an indent result that may be queried for changes and can be reused in subsequent
* indentation operations
* @throws BadLocationException if <code>lines</code> is not a valid line range on <code>document
* </code>
*/
public static IndentResult indentLines(
IDocument document, ILineRange lines, IJavaProject project, IndentResult result)
throws BadLocationException {
int numberOfLines = lines.getNumberOfLines();
if (numberOfLines < 1) return new IndentResult(null);
result = reuseOrCreateToken(result, numberOfLines);
JavaHeuristicScanner scanner = new JavaHeuristicScanner(document);
JavaIndenter indenter = new JavaIndenter(document, scanner, project);
boolean changed = false;
int tabSize = CodeFormatterUtil.getTabWidth(project);
for (int line = lines.getStartLine(), last = line + numberOfLines, i = 0; line < last; line++) {
changed |=
indentLine(
document, line, indenter, scanner, result.commentLinesAtColumnZero, i++, tabSize);
}
result.hasChanged = changed;
return result;
}