求个sac解析css的例子,或Flute、Batik、CSSParser解析css例子

Question

http://www.w3.org/Style/CSS/SAC/

 

SAC 1.3: Java Implementation

• SAC 1.3 (Download)
• SAC 1.3 Online javadoc documentation (Download)
• Some SAC implementation in Java:
  • Flute 1.2 (download) (W3C). This implementation is using JavaCC.
  • Batik SAC 1.2 CSS Parser (Apache). Smaller and faster than flute! Only available on the Apache CVS server.
  • CSS Parser (David Schweinsberg). The CSS Parser, very soon to be updated to SAC 1.3, is implemented as a package of Java classes, that inputs Cascading Style Sheets Level 2 source text and outputs a Document Object Model Level 2 Style tree. Alternatively, applications can use SAC: The Simple API for CSS. Its purpose is to allow developers working with Java to incorporate Cascading Style Sheet information, primarily in conjunction with XML application developments.

问题补充：
问下lovewhzlq

提供的例子中
87行和142行
processFilter(selectors, new Filter<String>()

中的Filter类是哪儿的,我试了几个都不行

Answer 1

[code="java"]

import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;
import org.w3c.css.sac.InputSource;
import org.w3c.dom.css.CSSImportRule;
import org.w3c.dom.css.CSSRule;
import org.w3c.dom.css.CSSRuleList;
import org.w3c.dom.css.CSSStyleRule;
import org.w3c.dom.css.CSSStyleSheet;

import com.steadystate.css.parser.CSSOMParser;

public class CSSParserUtils
{
private static Logger log = Logger.getLogger(CSSParserUtils.class);
public static String URIPath = "file:///" + "";

/**
 * 测试之用
 *
 * @param args
 */
public static void main(String[] args)
{
    System.out.println(parserCSSSelectors("F:/index.css"));

}

/**
 * 解析给定的url对应的页面文件中的css选择器
 *
 * @param url   给定页面文件url
 * @return  css选择器列表
 */
public static List<String> parserCSSSelectors(String url)
{
    return parserCSSSelectors(null, url);
}

/**
 * 合并两个方法成一个通用的方法
 *
 * @param read  如果不为null，则以它为主
 * @param url   如果不为null，则表示页面文件的url
 * @return  css选择器列表
 */
public static List<String> parserCSSSelectors(Reader read, String url)
{
    CSSOMParser cssparser = new CSSOMParser();
    CSSStyleSheet css = null;
    try
    {
        if (read == null)
            css = cssparser.parseStyleSheet(new InputSource(URIPath + url), null, null);
        else
            css = cssparser.parseStyleSheet(new InputSource(read), null, null);
    } catch (IOException e)
    {
        log.error("解析css文件异常", e);
        return null;
    }

    return parseCSSGeneral(url, css);
}

private static List<String> parseCSSGeneral(String url, CSSStyleSheet css)
{
    CSSRuleList cssrules = css.getCssRules();

    if (cssrules == null)
        return null;

    List<String> selectors = new ArrayList<String>();
    for (int i = 0; i < cssrules.getLength(); i++)
    {
        CSSRule rule = cssrules.item(i);
        if (rule instanceof CSSStyleRule)
        {
            CSSStyleRule cssrule = (CSSStyleRule) rule;

            processFilter(selectors, new Filter<String>()
            {

                public void accept(List<String> list, String t)
                {
                    if (t.indexOf(".") != -1)
                    {
                        String[] result = t.split("\\s");
                        for (int x = 0; x < result.length; x++)
                        {
                            int index = result[x].indexOf(".");
                            if (index != -1)
                            {
                                list.add(result[x].substring(index + 1));
                            }
                        }

                    }

                }

            }, cssrule.getSelectorText());
        }
        else if (rule instanceof CSSImportRule)
        {
            CSSImportRule cssrule = (CSSImportRule) rule;
            selectors.addAll(parserCSSSelectors(processURL(url, cssrule.getHref())));
        }

    }
    return selectors;
}

/**
 * 处理url
 *
 * @param url   原始url
 * @param dest  目标url
 * @return
 */
public static String processURL(String url, String dest)
{
    int indexWin = url.lastIndexOf("\\");
    int indexUnix = url.lastIndexOf("/");

    int index = indexWin == -1 ? indexUnix : indexWin;
    if (index != -1)
    {
        String ret = url.substring(0, index) + "/" + dest;
        return ret;
    }

    return dest;
}

public static void processFilter(List<String> selectors, Filter<String> selectorFilter,
                String selectorText)
{
    selectorFilter.accept(selectors, selectorText);
}

}

[/code]