/**
* Event.detail line start offset (input) Event.text line text (input) LineStyleEvent.styles
* Enumeration of StyleRanges, need to be in order. (output) LineStyleEvent.background line
* background color (output)
*/
public void lineGetStyle(LineStyleEvent event) {
Vector styles = new Vector();
int token;
StyleRange lastStyle;
// If the line is part of a block comment, create one style for the entire line.
if (inBlockComment(event.lineOffset, event.lineOffset + event.lineText.length())) {
styles.addElement(
new StyleRange(event.lineOffset, event.lineText.length(), getColor(COMMENT), null));
event.styles = new StyleRange[styles.size()];
styles.copyInto(event.styles);
return;
}
Color defaultFgColor = ((Control) event.widget).getForeground();
scanner.setRange(event.lineText);
token = scanner.nextToken();
while (token != EOF) {
if (token == OTHER) {
// do nothing for non-colored tokens
} else if (token != WHITE) {
Color color = getColor(token);
// Only create a style if the token color is different than the
// widget's default foreground color and the token's style is not
// bold. Keywords are bolded.
if ((!color.equals(defaultFgColor)) || (token == KEY)) {
StyleRange style =
new StyleRange(
scanner.getStartOffset() + event.lineOffset, scanner.getLength(), color, null);
if (token == KEY) {
style.fontStyle = SWT.BOLD;
}
if (styles.isEmpty()) {
styles.addElement(style);
} else {
// Merge similar styles. Doing so will improve performance.
lastStyle = (StyleRange) styles.lastElement();
if (lastStyle.similarTo(style) && (lastStyle.start + lastStyle.length == style.start)) {
lastStyle.length += style.length;
} else {
styles.addElement(style);
}
}
}
} else if ((!styles.isEmpty())
&& ((lastStyle = (StyleRange) styles.lastElement()).fontStyle == SWT.BOLD)) {
int start = scanner.getStartOffset() + event.lineOffset;
lastStyle = (StyleRange) styles.lastElement();
// A font style of SWT.BOLD implies that the last style
// represents a java keyword.
if (lastStyle.start + lastStyle.length == start) {
// Have the white space take on the style before it to
// minimize the number of style ranges created and the
// number of font style changes during rendering.
lastStyle.length += scanner.getLength();
}
}
token = scanner.nextToken();
}
event.styles = new StyleRange[styles.size()];
styles.copyInto(event.styles);
}
public void parseBlockComments(String text) {
blockComments = new Vector();
StringReader buffer = new StringReader(text);
int ch;
boolean blkComment = false;
int cnt = 0;
int[] offsets = new int[2];
boolean done = false;
try {
while (!done) {
switch (ch = buffer.read()) {
case -1:
{
if (blkComment) {
offsets[1] = cnt;
blockComments.addElement(offsets);
}
done = true;
break;
}
case '/':
{
ch = buffer.read();
if ((ch == '*') && (!blkComment)) {
offsets = new int[2];
offsets[0] = cnt;
blkComment = true;
cnt++;
} else {
cnt++;
}
cnt++;
break;
}
case '*':
{
if (blkComment) {
ch = buffer.read();
cnt++;
if (ch == '/') {
blkComment = false;
offsets[1] = cnt;
blockComments.addElement(offsets);
}
}
cnt++;
break;
}
default:
{
cnt++;
break;
}
}
}
} catch (IOException e) {
// ignore errors
}
}
boolean inBlockComment(int start, int end) {
for (int i = 0; i < blockComments.size(); i++) {
int[] offsets = (int[]) blockComments.elementAt(i);
// start of comment in the line
if ((offsets[0] >= start) && (offsets[0] <= end)) return true;
// end of comment in the line
if ((offsets[1] >= start) && (offsets[1] <= end)) return true;
if ((offsets[0] <= start) && (offsets[1] >= end)) return true;
}
return false;
}