Java Code Examples for org.eclipse.xtext.ui.editor.model.ILexerTokenRegion#getOffset()

/**
 * Creates a new template token for the given token id. A template token is in fact a list of tokens for the
 * colorer, e.g a single terminal on the grammar level may yield various tokens for the syntax coloring.
 */
protected TemplateToken createTemplateToken(int id, ILexerTokenRegion token) {
	int tokenOffset = token.getOffset();
	int tokenLength = token.getLength();
	TemplateToken result = new TemplateToken();
	switch (id) {
	case RULE_TEMPLATE_HEAD:
		result.delimiter = false; // ranges defined by 'offsets' and 'lengths' do *not* start with a delimiter
		result.offsets = new int[] { tokenOffset, tokenOffset + tokenLength - 2 };
		result.lengths = new int[] { tokenLength - 2, 2 };
		break;
	case RULE_TEMPLATE_MIDDLE:
		if (tokenLength == 2) {
			result.delimiter = true; // ranges defined by 'offsets' and 'lengths' start with a delimiter
			result.offsets = new int[] { tokenOffset };
			result.lengths = new int[] { tokenLength };
		} else {
			result.delimiter = false; // ranges defined by 'offsets' and 'lengths' do *not* start with a delimiter
			result.offsets = new int[] { tokenOffset, tokenOffset + tokenLength - 2 };
			result.lengths = new int[] { tokenLength - 2, 2 };
		}
	}
	return result;
}
 

public List<StyleRange> getRanges(String expression) {
	final List<StyleRange> ranges = Lists.newArrayList();
	DocumentEvent event = new DocumentEvent();
	event.fDocument = new DummyDocument(expression);
	DocumentTokenSource tokenSource = tokenSourceProvider.get();
	tokenSource.updateStructure(event);
	Iterator<ILexerTokenRegion> iterator = tokenSource.getTokenInfos().iterator();
	while (iterator.hasNext()) {
		ILexerTokenRegion next = iterator.next();
		TextAttribute attribute = attributeProvider.getAttribute(tokenTypeMapper.getId(next.getLexerTokenType()));
		StyleRange range = new StyleRange(next.getOffset(), next.getLength(), attribute.getForeground(),
				attribute.getBackground());
		range.font = attribute.getFont();
		range.fontStyle = attribute.getStyle();
		ranges.add(range);
	}
	return merge(ranges);
}
 

@Override
protected IRegion findWord(IDocument document, int offset) {
	Iterable<ILexerTokenRegion> tokenIterable = tokenSourceAccess.getTokens(document, true);
	if (tokenIterable == null) {
		return super.findWord(document, offset);
	}
	Iterator<ILexerTokenRegion> tokenIterator = tokenIterable.iterator();
	ILexerTokenRegion leadingToken = null;
	ILexerTokenRegion trailingToken = null;
	while(tokenIterator.hasNext()) {
		ILexerTokenRegion token = tokenIterator.next();
		if (token.getOffset() <= offset && token.getOffset() + token.getLength() >= offset) {
			if (leadingToken != null)
				trailingToken = token;
			else
				leadingToken = token;
		}
		if (token.getOffset() > offset)
			break;
	}
	if (leadingToken != null) {
		try {
			if (leadingToken.getLength() > 1 && (trailingToken == null || !Character.isLetter(document.getChar(trailingToken.getOffset())))) {
				return new Region(leadingToken.getOffset(), leadingToken.getLength());
			} else if (trailingToken != null) {
				return new Region(trailingToken.getOffset(), trailingToken.getLength());
			}
		} catch(BadLocationException ignore) {}
	}
	return super.findWord(document, offset);
}
 

private IRegion doComputeIntersection(ITypedRegion partition, DocumentEvent e, IDocument document) {
	Iterable<ILexerTokenRegion> tokensInPartition = Iterables.filter(tokenSourceAccess.getTokens(document, false), Regions.overlaps(partition.getOffset(), partition.getLength()));
	Iterator<ILexerTokenRegion> tokens = Iterables.filter(tokensInPartition, Regions.overlaps(e.getOffset(), e.getLength())).iterator();
	if (tokens.hasNext()) {
		ILexerTokenRegion first = tokens.next();
		ILexerTokenRegion last = first;
		while(tokens.hasNext())
			last = tokens.next();
		return new Region(first.getOffset(), last.getOffset()+last.getLength() -first.getOffset());
	}
	// this shouldn't happen, but just in case return the whole partition
	return partition;
}
 

protected RichTextToken createRichTextToken(String id, ILexerTokenRegion token) {
	int tokenOffset = token.getOffset();
	int tokenLength = token.getLength();
	RichTextToken result = new RichTextToken();
	if ("RULE_RICH_TEXT_START".equals(id)) {
		result.delimiter = false;
		result.offsets = new int[] { tokenOffset, tokenOffset + tokenLength - 1 };
		result.lengths = new int[] { tokenLength - 1, 1 };
	} else if ("RULE_RICH_TEXT_END".equals(id)) {
		result.delimiter = true;
		result.offsets = new int[] { tokenOffset, tokenOffset + 1 };
		result.lengths = new int[] { 1, tokenLength - 1 };
	} else if ("RULE_RICH_TEXT_INBETWEEN".equals(id)) {
		result.delimiter = true;
		if (tokenLength == 2) {
			result.offsets = new int[] { tokenOffset };
			result.lengths = new int[] { tokenLength };
		} else {
			result.offsets = new int[] { tokenOffset, tokenOffset + 1, tokenOffset + tokenLength - 1 };
			result.lengths = new int[] { 1, tokenLength - 2, 1 };
		}
	} else if ("RULE_COMMENT_RICH_TEXT_END".equals(id)) {
		result.delimiter = true;
		result.offsets = new int[] { tokenOffset, tokenOffset + 2 };
		result.lengths = new int[] { 2, tokenLength - 2 };
	} else if ("RULE_COMMENT_RICH_TEXT_INBETWEEN".equals(id)) {
		result.delimiter = true;
		result.offsets = new int[] { tokenOffset, tokenOffset + 2, tokenOffset + tokenLength - 1 };
		result.lengths = new int[] { 2, tokenLength - 3, 1 };
	} else 
		throw new IllegalArgumentException(id);
	return result;
}