package org.xmind.ui.richtext;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.ITokenScanner;
import org.eclipse.jface.text.rules.Token;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.widgets.Display;
public class RichTextScanner implements ITokenScanner {
private static final String regex = "\\b(https?|ftp|mailto|svn|irc|gopher|telnet|nntp|worldwind|news):(?:/{1,3})([\\w-]+\\.)+[\\w-]+[\\w-._/\\~%-+&#?!=()@:]*";//$NON-NLS-1$
private IRichDocument document;
private int offset;
private int length;
private StyleRange[] textStyles;
private int styleIndex;
private Hyperlink[] hyperlinks;
private int hyperlinkIndex;
private int lastOffset;
private int lastLength;
private List<AutoHyperlink> autoHyperRanges;
private int autoIndex;
public void setRange(IDocument document, int offset, int length) {
if (!(document instanceof IRichDocument))
return;
this.document = (IRichDocument) document;
this.offset = offset;
this.length = length;
this.textStyles = this.document.getTextStyles();
this.styleIndex = 0;
this.hyperlinks = this.document.getHyperlinks();
this.hyperlinkIndex = 0;
this.lastOffset = offset;
this.lastLength = 0;
getHyperlinkAt(offset);
refreshAutoHyperlinks();
this.autoIndex = 0;
}
public int getTokenLength() {
return lastLength;
}
public int getTokenOffset() {
return lastOffset;
}
public IToken nextToken() {
int current = lastOffset + lastLength;
if (current >= offset + length) {
return Token.EOF;
}
int next = offset + length;
Hyperlink h = getHyperlinkAt(current);
AutoHyperlink a = getAutoHyperlinkAt(current);
int hyperNext = 0;
if (h != null) {
if (current >= h.start) {
hyperNext = Math.min(next, h.start + h.length);
} else {
hyperNext = Math.min(next, h.start);
}
}
int autoNext = 0;
if (a != null) {
if (current >= a.start)
autoNext = Math.min(next, a.start + a.length);
else
autoNext = Math.min(next, a.start);
}
int tempStart = 0, tempLength = 0;
if (h != null && a != null) {
if (h.start < a.start) {
next = hyperNext;
tempStart = h.start;
tempLength = h.length;
} else {
next = autoNext;
tempStart = a.start;
tempLength = a.length;
}
} else if (h != null && a == null) {
next = hyperNext;
tempStart = h.start;
tempLength = h.length;
} else if (a != null && h == null) {
next = autoNext;
tempStart = a.start;
tempLength = a.length;
}
StyleRange style = getTextStyleAt(current);
if (style != null) {
if (current >= style.start) {
next = Math.min(next, style.start + style.length);
} else {
next = Math.min(next, style.start);
}
}
this.lastOffset = current;
this.lastLength = next - current;
if (lastLength <= 0) {
return Token.EOF;
}
if (!(style != null && current >= style.start && next <= style.start
+ style.length)) {
style = null;
}
// if (h != null && current >= h.start && next <= h.start + h.length) {
// if (a != null && current >= a.start && next <= a.start + a.len) {
if (h != null || a != null) {
if (current >= tempStart && next <= tempStart + tempLength) {
if (style == null)
style = RichTextUtils.DEFAULT_STYLE;
style = (StyleRange) style.clone();
if (style.foreground == null
|| style.foreground == RichTextUtils.DEFAULT_FOREGROUND
|| style.foreground
.equals(RichTextUtils.DEFAULT_FOREGROUND)) {
style.foreground = Display.getCurrent()
.getSystemColor(SWT.COLOR_BLUE);
}
style.underline = true;
}
}
return new Token(style);
}
public IToken nextToken1() {
int current = lastOffset + lastLength;
if (current >= offset + length) {
return Token.EOF;
}
int next = offset + length;
Hyperlink h = getHyperlinkAt(current);
if (h != null) {
if (current >= h.start) {
next = Math.min(next, h.start + h.length);
} else {
next = Math.min(next, h.start);
}
}
StyleRange style = getTextStyleAt(current);
if (style != null) {
if (current >= style.start) {
next = Math.min(next, style.start + style.length);
} else {
next = Math.min(next, style.start);
}
}
this.lastOffset = current;
this.lastLength = next - current;
if (lastLength <= 0) {
return Token.EOF;
}
if (!(style != null && current >= style.start && next <= style.start
+ style.length)) {
style = null;
}
if (h != null && current >= h.start && next <= h.start + h.length) {
if (style == null)
style = RichTextUtils.DEFAULT_STYLE;
style = (StyleRange) style.clone();
if (style.foreground == null
|| style.foreground == RichTextUtils.DEFAULT_FOREGROUND
|| style.foreground
.equals(RichTextUtils.DEFAULT_FOREGROUND)) {
style.foreground = Display.getCurrent()
.getSystemColor(SWT.COLOR_BLUE);
}
style.underline = true;
}
return new Token(style);
}
private Hyperlink getHyperlinkAt(int position) {
while (hyperlinkIndex < hyperlinks.length) {
Hyperlink h = hyperlinks[hyperlinkIndex];
if (position < h.start + h.length)
return h;
hyperlinkIndex++;
}
return null;
}
private AutoHyperlink getAutoHyperlinkAt(int position) {
if (autoHyperRanges == null)
return null;
AutoHyperlink[] autoArray = autoHyperRanges
.toArray(new AutoHyperlink[0]);
while (autoIndex < autoArray.length) {
AutoHyperlink autoHyperRange = autoArray[autoIndex];
if (position < autoHyperRange.start + autoHyperRange.length)
return autoHyperRange;
autoIndex++;
}
return null;
}
private StyleRange getTextStyleAt(int position) {
while (styleIndex < textStyles.length) {
StyleRange style = textStyles[styleIndex];
if (position < style.start + style.length)
return style;
styleIndex++;
}
return null;
}
private void refreshAutoHyperlinks() {
if (autoHyperRanges != null)
autoHyperRanges = null;
String content = document.get();
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(content);
while (matcher.find()) {
int start = matcher.start();
int length = matcher.end() - start;
if (autoHyperRanges == null)
autoHyperRanges = new ArrayList<AutoHyperlink>();
autoHyperRanges.add(new AutoHyperlink(start, length));
}
}
}
