/**
* Returns the leading whitespace of a string.
*
* @param text The String to check.
* @return The leading whitespace.
*/
public static String getLeadingWhitespace(String text) {
int count = 0;
int len = text.length();
while (count < len && RSyntaxUtilities.isWhitespace(text.charAt(count))) {
count++;
}
return text.substring(0, count);
}
public static int getMatchingBracketPosition(RSyntaxTextArea textArea) {
try {
// Actually position just BEFORE caret.
int caretPosition = textArea.getCaretPosition() - 1;
if (caretPosition > -1) {
// Some variables that will be used later.
Token token;
Element map;
int curLine;
Element line;
int start, end;
RSyntaxDocument doc = (RSyntaxDocument) textArea.getDocument();
char bracket = doc.charAt(caretPosition);
// First, see if the previous char was a bracket
// ('{', '}', '(', ')', '[', ']').
// If it was, then make sure this bracket isn't sitting in
// the middle of a comment or string. If it isn't, then
// initialize some stuff so we can continue on.
char bracketMatch;
boolean goForward;
switch (bracket) {
case '{':
case '(':
case '[':
// Ensure this bracket isn't in a comment.
map = doc.getDefaultRootElement();
curLine = map.getElementIndex(caretPosition);
line = map.getElement(curLine);
start = line.getStartOffset();
end = line.getEndOffset();
token = doc.getTokenListForLine(curLine);
token = RSyntaxUtilities.getTokenAtOffset(token, caretPosition);
// All brackets are always returned as "separators."
if (token.type != Token.SEPARATOR) {
return -1;
}
bracketMatch = bracket == '{' ? '}' : (bracket == '(' ? ')' : ']');
goForward = true;
break;
case '}':
case ')':
case ']':
// Ensure this bracket isn't in a comment.
map = doc.getDefaultRootElement();
curLine = map.getElementIndex(caretPosition);
line = map.getElement(curLine);
start = line.getStartOffset();
end = line.getEndOffset();
token = doc.getTokenListForLine(curLine);
token = RSyntaxUtilities.getTokenAtOffset(token, caretPosition);
// All brackets are always returned as "separators."
if (token.type != Token.SEPARATOR) {
return -1;
}
bracketMatch = bracket == '}' ? '{' : (bracket == ')' ? '(' : '[');
goForward = false;
break;
default:
return -1;
}
if (goForward) {
int lastLine = map.getElementCount();
// Start just after the found bracket since we're sure
// we're not in a comment.
start = caretPosition + 1;
int numEmbedded = 0;
boolean haveTokenList = false;
while (true) {
doc.getText(start, end - start, charSegment);
int segOffset = charSegment.offset;
for (int i = segOffset; i < segOffset + charSegment.count; i++) {
char ch = charSegment.array[i];
if (ch == bracket) {
if (haveTokenList == false) {
token = doc.getTokenListForLine(curLine);
haveTokenList = true;
}
int offset = start + (i - segOffset);
token = RSyntaxUtilities.getTokenAtOffset(token, offset);
if (token.type == Token.SEPARATOR) numEmbedded++;
} else if (ch == bracketMatch) {
if (haveTokenList == false) {
token = doc.getTokenListForLine(curLine);
haveTokenList = true;
}
int offset = start + (i - segOffset);
token = RSyntaxUtilities.getTokenAtOffset(token, offset);
if (token.type == Token.SEPARATOR) {
if (numEmbedded == 0) return offset;
numEmbedded--;
}
}
} // End of for (int i=segOffset; i<segOffset+charSegment.count; i++).
// Bail out if we've gone through all lines and
// haven't found the match.
if (++curLine == lastLine) return -1;
// Otherwise, go through the next line.
haveTokenList = false;
line = map.getElement(curLine);
start = line.getStartOffset();
end = line.getEndOffset();
} // End of while (true).
} // End of if (goForward).
// Otherwise, we're going backward through the file
// (since we found '}', ')' or ']').
else { // goForward==false
// End just before the found bracket since we're sure
// we're not in a comment.
end = caretPosition; // - 1;
int numEmbedded = 0;
boolean haveTokenList = false;
Token t2;
while (true) {
doc.getText(start, end - start, charSegment);
int segOffset = charSegment.offset;
int iStart = segOffset + charSegment.count - 1;
for (int i = iStart; i >= segOffset; i--) {
char ch = charSegment.array[i];
if (ch == bracket) {
if (haveTokenList == false) {
token = doc.getTokenListForLine(curLine);
haveTokenList = true;
}
int offset = start + (i - segOffset);
t2 = RSyntaxUtilities.getTokenAtOffset(token, offset);
if (t2.type == Token.SEPARATOR) numEmbedded++;
} else if (ch == bracketMatch) {
if (haveTokenList == false) {
token = doc.getTokenListForLine(curLine);
haveTokenList = true;
}
int offset = start + (i - segOffset);
t2 = RSyntaxUtilities.getTokenAtOffset(token, offset);
if (t2.type == Token.SEPARATOR) {
if (numEmbedded == 0) return offset;
numEmbedded--;
}
}
} // End of for (int i=segOffset; i<segOffset+charSegment.count; i++).
// Bail out if we've gone through all lines and
// haven't found the match.
if (--curLine == -1) return -1;
// Otherwise, get ready for going through the
// next line.
haveTokenList = false;
line = map.getElement(curLine);
start = line.getStartOffset();
end = line.getEndOffset();
} // End of while (true).
} // End of else.
} // End of if (caretPosition>-1).
} catch (BadLocationException ble) {
// Shouldn't ever happen.
ble.printStackTrace();
}
// Something went wrong...
return -1;
}