private String compile(HtmlLibrary library, ClosureOptimizationLevel opt, InputStream js)
throws IOException {
CompilationLevel compilationLevel = opt.toCompilationLevel();
if (null == compilationLevel) {
// return original input
return IOUtils.toString(js);
}
SourceFile input = SourceFile.fromInputStream(getLibraryName(library), js);
// TODO externs not supported, should avoid ADVANCED compilation
SourceFile extern = SourceFile.fromCode("TODO", StringUtils.EMPTY);
CompilerOptions options = new CompilerOptions();
compilationLevel.setOptionsForCompilationLevel(options);
// ES5 assumption to allow getters/setters
options.setLanguageIn(CompilerOptions.LanguageMode.ECMASCRIPT5);
Compiler compiler = new Compiler();
compiler.compile(extern, input, options);
return compiler.toSource();
}
/** @throws ExecutionException */
public void run() throws ExecutionException {
final Compiler compiler = new Compiler();
final CompilerOptions options = new CompilerOptions();
closureOptimization.setOptionsForCompilationLevel(options);
final List<JSSourceFile> externs = Collections.emptyList();
final List<JSSourceFile> sources = new ArrayList<JSSourceFile>();
if (closurePreScript != null) {
getLogger().info("Include PreScript:");
sources.add(JSSourceFile.fromCode("closurePreScript.js", closurePreScript));
}
getFiles(sources);
if (closurePostScript != null) {
getLogger().info("Include PostScript:");
sources.add(JSSourceFile.fromCode("closurePostScript.js", closurePostScript));
}
getLogger().info("Got " + sources.size() + " source files");
final Result result = compiler.compile(externs, sources, options);
if (!result.success) {
throw new ExecutionException("Failed to compile scripts");
}
getLogger().info("Writing compiled js to " + closureTargetFile);
try {
FileUtils.forceMkdir(closureTargetFile.getParentFile());
final FileWriter writer = new FileWriter(closureTargetFile);
try {
String preSource =
closurePreScriptFile != null ? FileUtils.readFileToString(closurePreScriptFile) : "";
String postSource =
closurePostScriptFile != null ? FileUtils.readFileToString(closurePostScriptFile) : "";
StringBuilder sb = new StringBuilder();
sb.append(preSource).append(compiler.toSource()).append(postSource);
writer.write(sb.toString());
} finally {
writer.close();
}
} catch (IOException e) {
throw new ExecutionException("Failed to write target file: " + closureTargetFile, e);
}
}
private static CompilationLevel getCompilationLevel(String level) {
return CompilationLevel.valueOf(level);
}