package com.github.jknack.mwa.wro4j;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.io.IOUtils;
import org.lesscss.LessCompiler;
import org.lesscss.LessException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ro.isdc.wro.config.Context;
import ro.isdc.wro.model.resource.ResourceType;
import ro.isdc.wro.model.resource.SupportedResourceType;
import ro.isdc.wro.model.resource.processor.ResourcePostProcessor;
import ro.isdc.wro.util.StopWatch;
/**
* Another less css processor base on {@link LessCompiler}.
*
* @author edgar.espina
* @since 0.1.2
*/
@SupportedResourceType(ResourceType.CSS)
public class LessCssProcessor implements ResourcePostProcessor {
/**
* The logging system.
*/
private static final Logger logger = LoggerFactory
.getLogger(LessCssProcessor.class);
/**
* Creates a new {@link LessCssProcessor}.
*/
public LessCssProcessor() {
}
@Override
public void process(final Reader reader, final Writer writer)
throws IOException {
final StopWatch stopWatch = new StopWatch();
stopWatch.start("lessify");
Context context = Context.get();
HttpServletRequest request = context.getRequest();
String uri = request.getRequestURI();
try {
logger.debug("lessifying: {}", uri);
LessCompiler less = new LessCompiler();
String content = IOUtils.toString(reader);
writer.write(less.compile(content));
} catch (LessException ex) {
throw new LessRuntimeException(LessCssError.of(
uri, ex.getCause()), ex.getCause());
} finally {
// Rhino throws an exception when trying to exit twice. Make sure we don't
// get any exception
if (org.mozilla.javascript.Context.getCurrentContext() != null) {
org.mozilla.javascript.Context.exit();
}
IOUtils.closeQuietly(reader);
IOUtils.closeQuietly(writer);
stopWatch.stop();
logger.debug(stopWatch.prettyPrint());
}
}
}