org.vectomatic.dom.svg.impl.SVGParserImplOpera.java Source code

Introduction

Here is the source code for org.vectomatic.dom.svg.impl.SVGParserImplOpera.java

Source

/**********************************************
 * Copyright (C) 2010 Lukas Laag
 * This file is part of lib-gwt-svg.
 * 
 * libgwtsvg is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * libgwtsvg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with libgwtsvg.  If not, see http://www.gnu.org/licenses/
 **********************************************/
package org.vectomatic.dom.svg.impl;

import java.util.Stack;

import org.vectomatic.dom.svg.OMSVGAnimatedString;
import org.vectomatic.dom.svg.OMSVGStyle;
import org.vectomatic.dom.svg.utils.DOMHelper;
import org.vectomatic.dom.svg.utils.ParserException;
import org.vectomatic.dom.svg.utils.SVGConstants;

import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Node;
import com.google.gwt.dom.client.NodeList;
import com.google.gwt.dom.client.Text;
import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;

/**
 * Internal class to wrap DOM parser implementations for opera
 * @author laaglu
 */
public class SVGParserImplOpera extends SVGParserImpl {
    private static final String URL = "^url\\((['\"])?[^#\\)]*#([^'\"\\)]*)\\1\\)$";
    private static final RegExp URLExp = RegExp.compile(URL, "g");

    private static String getRef(String expr) {
        URLExp.setLastIndex(0);
        MatchResult result = URLExp.exec(expr);
        if (result != null && result.getGroupCount() == 3) {
            return result.getGroup(2);
        }
        return null;
    }

    /**
     * Parses the supplied SVG text into a document
     * @param rawSvg
     * raw xml to be parsed
     * @return
     * the document resulting from the parse
     */
    public final SVGSVGElement parse(String rawSvg) throws ParserException {
        SVGDocument doc = parseFromString(rawSvg, "text/xml").cast();
        Element elt = doc.getDocumentElement();
        if ("parsererror".equals(DOMHelper.getLocalName(elt))) {
            String message = "Parsing error";
            if (elt.getFirstChild() != null) {
                message = elt.getFirstChild().<Text>cast().getData();
            }
            throw new ParserException(ParserException.Type.NotWellFormed, message);
        }
        SVGSVGElement svg = DOMHelper.importNode(DOMHelper.getCurrentDocument(), elt, true).cast();
        operaFix(svg);
        return svg;
    }

    /**
     * Fix for opera.
     * SVG Objects created by the parser and imported do not seem to recognize their
     * CSS attributes. Reapplying them seems to solve the issue.
     * The CSS style attributes which contain hrefs to svg elements are corrupted an
     * need to be fixed as well.
     * @param root
     */
    private static void operaFix(Element root) {
        Stack<Element> stack = new Stack<Element>();
        stack.push(root);
        while (!stack.empty()) {
            Element element = stack.pop();
            if (SVGConstants.SVG_NAMESPACE_URI.equals(DOMHelper.getNamespaceURI(element))) {
                OMSVGAnimatedString cn = element.<SVGElement>cast().getClassName_();
                if (cn != null) {
                    String value = cn.getBaseVal();
                    if (value != null && value.length() > 0) {
                        cn.setBaseVal(value);
                    }
                }
                if (element.hasAttribute(SVGConstants.SVG_STYLE_ATTRIBUTE)) {
                    element.setAttribute(SVGConstants.SVG_STYLE_ATTRIBUTE,
                            element.getAttribute(SVGConstants.SVG_STYLE_ATTRIBUTE));
                    OMSVGStyle style = element.getStyle().<OMSVGStyle>cast();
                    fixProperty(style, SVGConstants.CSS_FILL_PROPERTY);
                    fixProperty(style, SVGConstants.CSS_STROKE_PROPERTY);
                }
            }
            NodeList<Node> childNodes = element.getChildNodes();
            for (int i = 0, length = childNodes.getLength(); i < length; i++) {
                Node node = childNodes.getItem(i);
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    stack.push(node.<Element>cast());
                }
            }
        }
    }

    private static void fixProperty(OMSVGStyle style, String propertyName) {
        String propertyValue = style.getSVGProperty(propertyName);
        if (propertyValue != null && propertyValue.length() > 0) {
            String ref = getRef(propertyValue);
            if (ref != null) {
                String url = "url('#" + ref + "')";
                style.setSVGProperty(propertyName, url);
            }
        }
    }
}