gistfile1.txt

package uk.co.****.****.presentation.web.util.jawr;

import net.jawr.web.resource.bundle.postprocess.ResourceBundlePostProcessor;
import net.jawr.web.resource.bundle.postprocess.BundleProcessingStatus;

import java.util.regex.Pattern;
import java.util.regex.Matcher;
import javax.servlet.ServletContext;

/**
 * A Q n D Bundle Post Processor that moves any @imports that have been marooned in the middle of the
 * bundle file to the top. Assumes that csspathrewriter file post processor is run
 * <p/>
 * 
 */
public class CSSImportPostProcessor implements ResourceBundlePostProcessor {

  private static final Pattern AT_IMPORT_RE = Pattern.compile("(@import url.*;)");


  private static final Pattern URL_PATTERN = Pattern.compile( "url\\(\\s*\"([^\\)]*)\"\\s*\\)" );

  /**
   * Postprocess a bundle of resources.
   *
   * @param status the BundleProcessingStatus
   * @param bundleString StringBuffer Joined resources.
   * @return StringBuffer a buffer containing the postprocessed bundle.
   */
  public StringBuffer postProcessBundle( final BundleProcessingStatus status, final StringBuffer bundleString ) {
    StringBuffer result = new StringBuffer( );

//this is a hack, use the ServletContext context path and jawr css base property
    String cssImportBase = (String)status.getJawrConfig().getConfigProperties().get( "jawr.css.importurl.base" );

    Matcher matcher = AT_IMPORT_RE.matcher( bundleString );

    while(matcher.find()) {
      String importStatement = matcher.group();
      importStatement = fixURL(importStatement, cssImportBase);
      //we need to resolve the path, JAWR will have made paths to imports assuming that ALL css is handled by the servlet
      result.append(importStatement).append("\n");
    }

    result.append("\n").append(matcher.replaceAll( "" ));


  //quick and dirty chaining to get around bug in JAWR with 2 custom post processors
    return new CSSImagePostProcessor().postProcessBundle( status, result);
  }

  private String fixURL(String importStatement, String cssImportBase) {
    StringBuilder url = new StringBuilder();

    Matcher m = URL_PATTERN.matcher( importStatement );
    url.append(m.replaceAll(  "url(\""+ cssImportBase + "$1\")"  ));

    return url.toString();
  }
}