/**
* Search for a resource in a local path, or the main repository path.
*
* @param path the resource name
* @param loaders optional list of module loaders
* @param localRoot a repository to look first
* @return the resource
* @throws IOException if an I/O error occurred
*/
public Resource findResource(String path, ModuleLoader[] loaders, Repository localRoot)
throws IOException {
// Note: as an extension to the CommonJS modules API
// we allow absolute module paths for resources
File file = new File(path);
if (file.isAbsolute()) {
Resource res;
outer:
if (loaders != null) {
// loaders must contain at least one loader
assert loaders.length > 0 && loaders[0] != null;
for (ModuleLoader loader : loaders) {
res = new FileResource(path + loader.getExtension());
if (res.exists()) {
break outer;
}
}
res = new FileResource(path + loaders[0].getExtension());
} else {
res = new FileResource(file);
}
res.setAbsolute(true);
return res;
} else if (localRoot != null && (path.startsWith("./") || path.startsWith("../"))) {
String newpath = localRoot.getRelativePath() + path;
return findResource(newpath, loaders, null);
} else {
return config.getResource(normalizePath(path), loaders);
}
}
/**
* Invoke a script from the command line.
*
* @param scriptResource the script resource of path
* @param scriptArgs an array of command line arguments
* @return the return value
* @throws IOException an I/O related error occurred
* @throws JavaScriptException the script threw an error during compilation or execution
*/
public Object runScript(Object scriptResource, String... scriptArgs)
throws IOException, JavaScriptException {
Resource resource;
if (scriptResource instanceof Resource) {
resource = (Resource) scriptResource;
} else if (scriptResource instanceof String) {
resource = findResource((String) scriptResource, null, null);
} else {
throw new IOException("Unsupported script resource: " + scriptResource);
}
if (!resource.exists()) {
throw new FileNotFoundException(scriptResource.toString());
}
Context cx = contextFactory.enterContext();
try {
Object retval;
Map<Trackable, ReloadableScript> scripts = getScriptCache(cx);
commandLineArgs = Arrays.asList(scriptArgs);
ReloadableScript script = new ReloadableScript(resource, this);
scripts.put(resource, script);
mainScope = new ModuleScope(resource.getModuleName(), resource, globalScope, mainWorker);
retval = mainWorker.evaluateScript(cx, script, mainScope);
mainScope.updateExports();
return retval instanceof Wrapper ? ((Wrapper) retval).unwrap() : retval;
} finally {
Context.exit();
}
}
private void evaluateBootstrapScripts(Context cx) throws IOException {
List<String> bootstrapScripts = config.getBootstrapScripts();
if (bootstrapScripts != null) {
for (String script : bootstrapScripts) {
Resource resource = new FileResource(script);
// not found, attempt to resolve the file relative to ringo home
if (!resource.exists()) {
resource = getRingoHome().getResource(script);
}
if (resource == null || !resource.exists()) {
throw new FileNotFoundException("Bootstrap script " + script + " not found");
}
mainWorker.evaluateScript(cx, new ReloadableScript(resource, this), globalScope);
}
}
}
/**
* Resolves a module id to a package resource. If module id consists of just one term and resolves
* to a package directory, the main module of the package is returned. If the module id consists
* of several terms and the first term resolves to a package directory, the remaining part of the
* module id is resolved against the "lib" directory of the package.
*
* @link http://nodejs.org/docs/v0.4.4/api/modules.html#folders_as_Modules
* @param moduleName the name of the package to load
* @param localPath the path of the resource issuing this call
* @return the location of the package's main module
* @throws IOException an unrecoverable I/O exception occurred while reading the package
*/
protected Resource loadPackage(String moduleName, Repository localPath) throws IOException {
int slash = 0;
String packageName, remainingName;
do {
slash = moduleName.indexOf('/', slash + 1);
if (slash == -1) {
packageName = moduleName;
remainingName = null;
} else {
packageName = moduleName.substring(0, slash);
if (".".equals(packageName) || "..".equals(packageName)) continue;
remainingName = moduleName.substring(slash + 1);
}
Resource json = findResource(packageName + "/package.json", null, localPath);
if (json != null && json.exists()) {
Scriptable obj = parseJsonResource(json);
Repository parent = json.getParentRepository();
String moduleId;
Resource res;
if (remainingName == null) {
// get the main module of this package
moduleId = getStringProperty(obj, "main", null);
if (moduleId != null) {
// optimize for the common case where main module
// property links to the exact file name
res = parent.getResource(moduleId);
if (res != null && res.exists()) return res;
}
} else {
// map remaining name to libs directory
String lib = "lib";
Object dirs = ScriptableObject.getProperty(obj, "directories");
if (dirs instanceof Scriptable) {
lib = getStringProperty((Scriptable) dirs, "lib", "lib");
}
moduleId = lib + "/" + remainingName;
}
if (moduleId != null) {
for (ModuleLoader loader : loaders) {
res = parent.getResource(moduleId + loader.getExtension());
if (res != null && res.exists()) return res;
}
if (remainingName != null) {
res = parent.getResource(moduleId);
if (res != null && res.exists()) return res;
}
}
}
} while (slash != -1);
return findResource(moduleName + "/index", loaders, localPath);
}
public ModuleLoader getModuleLoader(Resource resource) {
String name = resource.getName();
for (ModuleLoader loader : loaders) {
if (name.endsWith(loader.getExtension())) {
return loader;
}
}
return loaders[0];
}
private Scriptable parseJsonResource(Resource resource) throws IOException {
JsonParser parser = new JsonParser(Context.getCurrentContext(), globalScope);
try {
Object result = parser.parseValue(resource.getContent());
if (!(result instanceof Scriptable)) {
throw new RuntimeException("Expected Object from package.json, got " + result);
}
return (Scriptable) result;
} catch (JsonParser.ParseException px) {
throw new RuntimeException(px);
}
}
/**
* Resolves a type name to a script file within our script directory and returns a Scriptable
* evaluated to the file.
*
* @param moduleName the name of the module to load
* @param localPath the path of the resource issuing this call
* @return The raw compiled script for the module
* @throws JavaScriptException if an error occurred evaluating the script file
* @throws IOException if an error occurred reading the script file
*/
public ReloadableScript getScript(String moduleName, Repository localPath)
throws JavaScriptException, IOException {
ReloadableScript script;
Resource source = findResource(moduleName, loaders, localPath);
if (!source.exists()) {
source = loadPackage(moduleName, localPath);
if (!source.exists()) {
source = findResource(moduleName, null, localPath);
}
}
Context cx = Context.getCurrentContext();
Map<Trackable, ReloadableScript> scripts = getScriptCache(cx);
if (scripts.containsKey(source)) {
script = scripts.get(source);
} else {
script = new ReloadableScript(source, this);
if (source.exists()) {
scripts.put(source, script);
}
}
return script;
}
