@Override public String process(final String filename, final String source, final Config conf, final ClassLoader loader) throws Exception { String path = filename; try { LessCompiler compiler = new ThreadUnsafeLessCompiler(); LessSource src = new LessStrSource(source, path); CompilationResult result = compiler.compile(src, lessConf(conf)); result.getWarnings().forEach(warn -> { log.warn("{}:{}:{}:{}: {}", path, warn.getType(), warn.getLine(), warn.getCharacter(), warn.getMessage()); }); if (path.endsWith(".map")) { return result.getSourceMap(); } else { return result.getCss(); } } catch (Less4jException ex) { List<AssetProblem> problems = ex.getErrors().stream() .map(it -> new AssetProblem(path, it.getLine(), it.getCharacter(), it.getMessage(), null)) .collect(Collectors.toList()); throw new AssetException(name(), problems); } }