import io.bit3.jsass.Compiler; //导入依赖的package包/类
private void compressJs(String sourceName, InputStream in, OutputStream out) throws IOException
{
    CompilerOptions options = new CompilerOptions();
    CompilationLevel.SIMPLE_OPTIMIZATIONS.setOptionsForCompilationLevel(options);

    SourceFile input = SourceFile.fromInputStream(sourceName, in, Charset.forName("UTF-8"));

    com.google.javascript.jscomp.Compiler compiler = new com.google.javascript.jscomp.Compiler();
    compiler.compile(Collections.EMPTY_LIST, Collections.singletonList(input), options);

    if (compiler.hasErrors())
    {
        throw new EvaluatorException(compiler.getErrors()[0].description);
    }

    String compressed = compiler.toSource();
    IOUtils.copy(new StringReader(compressed), out);
}
 

import io.bit3.jsass.Compiler; //导入依赖的package包/类
private File cssFromSass(File source) throws IOException
{
    String sourceName = source.getName();

    int lastDotIndex = sourceName.lastIndexOf(SASS_SUFFIX);
    String cssName = sourceName.substring(0, lastDotIndex) + CSS_SUFFIX;
    File cssFile = new File(source.getParentFile(), cssName);

    //ONLY FROM CACHE IF WAS MODIFIED AFTER SASS FILE
    if (cssFile.exists() && source.lastModified() <= cssFile.lastModified())
    {
        List<String> lines = IOUtils.readLines(new FileInputStream(cssFile));
        if (lines != null && !lines.isEmpty())
        {
            return cssFile;
        }
    }

    if (!cssFile.exists() && !cssFile.createNewFile())
    {
        LOG.log(Level.SEVERE, "Could not create: {0} to compile sass", cssFile.getAbsolutePath());
        return null;
    }

    Compiler compiler = new Compiler();
    Options options = new Options();//TODO: options
    try
    {
        Output output = compiler.compileFile(source.toURI(), cssFile.toURI(), options);
        IOUtils.copy(new StringReader(output.getCss()), new FileOutputStream(cssFile));

        return cssFile;
    }
    catch (CompilationException ex)
    {
        LOG.log(Level.SEVERE, "Error compiling SASS: {0}", ex.getMessage());
        return null;
    }
}
 

import io.bit3.jsass.Compiler; //导入依赖的package包/类
@Override public void compiler(String rurl, Writer output, @Nonnull ParameterInfoImpl params, @Nonnull IResourceDependencyList rdl) throws Exception {
	/*
	 * Define resolvers: these resolve "filenames" in the scss to resources in the webapp.
	 */
	String basePath;
	int pos = rurl.lastIndexOf('/');
	if(pos == -1) {
		basePath = "";
	} else {
		basePath = rurl.substring(pos + 1);
	}

	JSassResolver jsr = new JSassResolver(params, basePath, rdl);

	Import file = jsr.resolve(rurl, "");
	if(null == file)
		throw new ThingyNotFoundException("The sass/scss file " + rurl + " could not be found");

	File out = File.createTempFile("sass-out-", ".css");
	System.out.println("out " + out);

	Options opt = new Options();
	opt.setImporters(Collections.singletonList(jsr));
	opt.setOutputStyle(OutputStyle.EXPANDED);
	opt.setIndent("\t");
	opt.setLinefeed("\n");
	opt.setSourceMapEmbed(true);
	opt.setSourceComments(false);

	boolean isSass = rurl.toLowerCase().endsWith(".sass");
	opt.setIsIndentedSyntaxSrc(isSass);

	StringContext fc = new StringContext(file.getContents(), file.getImportUri(), out.toURI(), opt);
	Compiler co = new Compiler();
	Output res = co.compile(fc);
	String css = res.getCss();
	output.write(css);
	out.delete();
	jsr.close();
}
 

import io.bit3.jsass.Compiler; //导入依赖的package包/类
private static void sassify(File sassFile) {
    final File outputFile = getOutputFile(sassFile, Suffix.CSS);

    final URI inputURI = sassFile.toURI();
    final URI outputURI = outputFile.toURI();

    final Compiler compiler = new Compiler();
    try {
      final Output output = compiler.compileFile(inputURI, outputURI, new Options());
      FileUtils.writeStringToFile(outputFile, output.getCss(), Default.ENCODING.toString());
      logPreprocess(sassFile, outputFile);
    } catch (CompilationException | IOException e) {
        LOG.error("Failed to preprocess SASS file", e);
    }
}
 

import io.bit3.jsass.Compiler; //导入依赖的package包/类
@Override
// If checkCacheInvalidation is true and, before invocation, a cached value exists and is not up to date, we evict the cache entry. 
@CacheEvict(value = "scssService.compiledStylesheets", 
		key = "T(fr.openwide.core.wicket.more.css.scss.service.ScssServiceImpl).getCacheKey(#scope, #path)",
		beforeInvocation = true,
		condition= "#checkCacheEntryUpToDate && !(caches.?[name=='scssService.compiledStylesheets'][0]?.get(T(fr.openwide.core.wicket.more.css.scss.service.ScssServiceImpl).getCacheKey(#scope, #path))?.get()?.isUpToDate() ?: false)"
		)
// THEN, we check if a cached value exists. If it does, it is returned ; if not, the method is called. 
@Cacheable(value = "scssService.compiledStylesheets",
		key = "T(fr.openwide.core.wicket.more.css.scss.service.ScssServiceImpl).getCacheKey(#scope, #path)")
public ScssStylesheetInformation getCompiledStylesheet(Class<?> scope, String path, boolean checkCacheEntryUpToDate)
		throws ServiceException {
	String scssPath = getFullPath(scope, path);
	
	try {
		JSassScopeAwareImporter importer = new JSassScopeAwareImporter(SCOPES);
		importer.addSourceUri(scssPath);
		
		Compiler compiler = new Compiler();
		Options options = new Options();
		options.setOutputStyle(OutputStyle.EXPANDED);
		options.setIndent("\t");
		options.getImporters().add(importer);
		
		ClassPathResource scssCpr = new ClassPathResource(scssPath);
		
		Context fileContext = new StringContext(IOUtils.toString(scssCpr.getInputStream()), new URI("classpath", "/" + scssPath, null), null, options);
		Output output = compiler.compile(fileContext);
		// Write result
		ScssStylesheetInformation compiledStylesheet = new ScssStylesheetInformation(scssPath, output.getCss());
		
		for (String sourceUri : importer.getSourceUris()) {
			ClassPathResource cpr = new ClassPathResource(sourceUri);
			compiledStylesheet.addImportedStylesheet(new ScssStylesheetInformation(sourceUri, cpr.lastModified()));
		}
		
		return compiledStylesheet;
	} catch (RuntimeException | IOException | URISyntaxException | CompilationException e) {
		throw new ServiceException(String.format("Error compiling %1$s", scssPath), e);
	}
}
 

import io.bit3.jsass.Compiler; //导入依赖的package包/类
@Override
public String process(final String filename, final String source, final Config conf, final ClassLoader loader)
    throws Exception {
  String syntax = get("syntax");
  String importer = get("importer").toString().toUpperCase();
  Function<String, URI> resolver;
  if("FILE".equals(importer)) {
    resolver = FS;
  } else {
    resolver = CP.apply(loader);
  }
  OutputStyle style = OutputStyle.valueOf(get("style").toString().toUpperCase());

  Options options = new Options();
  options.setIsIndentedSyntaxSrc("sass".equals(syntax));
  options.getImporters().add(new SassImporter(syntax, resolver));
  options.setOutputStyle(style);
  options.setIndent(get("indent"));
  options.setLinefeed(get("linefeed"));
  options.setOmitSourceMapUrl(get("omitSourceMapUrl"));
  options.setPrecision(get("precision"));
  options.setSourceComments(get("sourceComments"));

  String sourcemap = get("sourcemap");
  if ("inline".equals(sourcemap)) {
    options.setSourceMapEmbed(true);
  } else if ("file".equals(sourcemap)) {
    options.setSourceMapFile(URI.create(filename + ".map"));
  }
  try {
    URI input = URI.create(filename);
    StringContext ctx = new StringContext(source, input, null, options);
    Output output = new Compiler().compile(ctx);
    return filename.endsWith(".map") ? output.getSourceMap() : output.getCss();
  } catch (CompilationException x) {
    Matcher matcher = LOCATION.matcher(x.getErrorJson());
    Map<String, Integer> location = new HashMap<>();
    while (matcher.find()) {
      location.put(matcher.group(1), Integer.parseInt(matcher.group(2)));
    }
    int line = location.getOrDefault("line", -1);
    int column = location.getOrDefault("column", -1);
    throw new AssetException(name(),
        new AssetProblem(Optional.ofNullable(x.getErrorFile()).orElse(filename), line, column,
            x.getErrorText(), null));
  }
}