src.org.python.modules.imp Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jython Show documentation
Show all versions of jython Show documentation
Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
package org.python.modules;
import org.python.core.__builtin__;
import org.python.core.Py;
import org.python.core.PyFile;
import org.python.core.PyList;
import org.python.core.PyModule;
import org.python.core.PyObject;
import org.python.core.PyString;
import org.python.core.PySystemState;
import org.python.core.PyTuple;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
/*
* A bogus implementation of the CPython builtin module "imp".
* Only the functions required by IDLE and PMW are implemented.
* Luckily these function are also the only function that IMO can
* be implemented under Jython.
*/
public class imp {
public static PyString __doc__ = new PyString(
"This module provides the components needed to build your own\n"+
"__import__ function. Undocumented functions are obsolete.\n"
);
public static final int PY_SOURCE = 1;
public static final int PY_COMPILED = 2;
public static final int C_EXTENSION = 3;
public static final int PKG_DIRECTORY = 5;
public static final int C_BUILTIN = 6;
public static final int PY_FROZEN = 7;
public static final int IMP_HOOK = 9;
private static class ModuleInfo {
PyObject file;
String filename;
String suffix;
String mode;
int type;
ModuleInfo(PyObject file, String filename, String suffix, String mode, int type) {
this.file = file;
this.filename = filename;
this.suffix = suffix;
this.mode = mode;
this.type = type;
}
}
private static PyObject newFile(File file) {
try {
return new PyFile(new FileInputStream(file));
} catch (IOException ioe) {
throw Py.IOError(ioe);
}
}
private static boolean caseok(File file, String filename) {
return org.python.core.imp.caseok(file, filename);
}
/**
* This needs to be consolidated with the code in (@see org.python.core.imp).
*
* @param name module name
* @param entry a path String
* @param findingPackage if looking for a package only try to locate __init__
* @return null if no module found otherwise module information
*/
static ModuleInfo findFromSource(String name, String entry, boolean findingPackage,
boolean preferSource) {
String sourceName = "__init__.py";
String compiledName = "__init__$py.class";
String directoryName = PySystemState.getPathLazy(entry);
// displayDirName is for identification purposes: when null it
// forces java.io.File to be a relative path (e.g. foo/bar.py
// instead of /tmp/foo/bar.py)
String displayDirName = entry.equals("") ? null : entry;
// First check for packages
File dir = findingPackage ? new File(directoryName) : new File(directoryName, name);
File sourceFile = new File(dir, sourceName);
File compiledFile = new File(dir, compiledName);
boolean pkg = dir.isDirectory() && caseok(dir, name) && (sourceFile.isFile()
|| compiledFile.isFile());
if(!findingPackage) {
if(pkg) {
return new ModuleInfo(Py.None, new File(displayDirName, name).getPath(),
"", "", PKG_DIRECTORY);
} else {
Py.writeDebug("import", "trying source " + dir.getPath());
sourceName = name + ".py";
compiledName = name + "$py.class";
sourceFile = new File(directoryName, sourceName);
compiledFile = new File(directoryName, compiledName);
}
}
if (sourceFile.isFile() && caseok(sourceFile, sourceName)) {
if (!preferSource && compiledFile.isFile() && caseok(compiledFile, compiledName)) {
Py.writeDebug("import", "trying precompiled " + compiledFile.getPath());
long pyTime = sourceFile.lastModified();
long classTime = compiledFile.lastModified();
if (classTime >= pyTime) {
return new ModuleInfo(newFile(compiledFile),
new File(displayDirName, compiledName).getPath(),
".class", "rb", PY_COMPILED);
}
}
return new ModuleInfo(newFile(sourceFile),
new File(displayDirName, sourceName).getPath(),
".py", "r", PY_SOURCE);
}
// If no source, try loading precompiled
Py.writeDebug("import", "trying " + compiledFile.getPath());
if (compiledFile.isFile() && caseok(compiledFile, compiledName)) {
return new ModuleInfo(newFile(compiledFile),
new File(displayDirName, compiledName).getPath(),
".class", "rb", PY_COMPILED);
}
return null;
}
public static PyObject load_dynamic(String name, String pathname) {
return load_dynamic(name, pathname, null);
}
public static PyObject load_dynamic(String name, String pathname, PyObject file) {
throw Py.ImportError("No module named " + name);
}
public static PyObject load_source(String modname, String filename) {
return load_source(modname, filename, null);
}
public static PyObject load_source(String modname, String filename, PyObject file) {
PyObject mod = Py.None;
if (file == null) {
// XXX: This should load the accompanying byte code file instead, if it exists
file = new PyFile(filename, "r", 1024);
}
Object o = file.__tojava__(InputStream.class);
if (o == Py.NoConversion) {
throw Py.TypeError("must be a file-like object");
}
PySystemState sys = Py.getSystemState();
String compiledFilename =
org.python.core.imp.makeCompiledFilename(sys.getPath(filename));
mod = org.python.core.imp.createFromSource(modname.intern(), (InputStream)o,
filename, compiledFilename);
PyObject modules = sys.modules;
modules.__setitem__(modname.intern(), mod);
return mod;
}
public static PyObject load_compiled(String name, String pathname) {
return load_compiled(name, pathname, new PyFile(pathname, "rb", -1));
}
public static PyObject reload(PyObject module) {
return __builtin__.reload(module);
}
public static PyObject load_compiled(String name, String pathname, PyObject file) {
InputStream stream = (InputStream) file.__tojava__(InputStream.class);
if (stream == Py.NoConversion) {
throw Py.TypeError("must be a file-like object");
}
// XXX: Ideally we wouldn't care about sourceName here (see
// http://bugs.jython.org/issue1605847 msg3805)
String sourceName = pathname;
if (sourceName.endsWith("$py.class")) {
sourceName = sourceName.substring(0, sourceName.length() - 9) + ".py";
}
return org.python.core.imp.loadFromCompiled(name.intern(), stream, sourceName, pathname);
}
public static PyObject find_module(String name) {
return find_module(name, Py.None);
}
public static PyObject find_module(String name, PyObject path) {
if (path == Py.None && PySystemState.getBuiltin(name) != null) {
return new PyTuple(Py.None, Py.newString(name),
new PyTuple(Py.EmptyString, Py.EmptyString,
Py.newInteger(C_BUILTIN)));
}
if (path == Py.None) {
path = Py.getSystemState().path;
}
for (PyObject p : path.asIterable()) {
ModuleInfo mi = findFromSource(name, p.toString(), false, true);
if(mi == null) {
continue;
}
return new PyTuple(mi.file,
new PyString(mi.filename),
new PyTuple(new PyString(mi.suffix),
new PyString(mi.mode),
Py.newInteger(mi.type)));
}
throw Py.ImportError("No module named " + name);
}
public static PyObject load_module(String name, PyObject file, PyObject filename, PyTuple data) {
PyObject mod = Py.None;
PySystemState sys = Py.getSystemState();
int type = data.__getitem__(2).asInt();
while(mod == Py.None) {
String compiledName;
switch (type) {
case PY_SOURCE:
Object o = file.__tojava__(InputStream.class);
if (o == Py.NoConversion) {
throw Py.TypeError("must be a file-like object");
}
// XXX: This should load the accompanying byte code file instead, if it exists
String resolvedFilename = sys.getPath(filename.toString());
compiledName = org.python.core.imp.makeCompiledFilename(resolvedFilename);
if (name.endsWith(".__init__")) {
name = name.substring(0, name.length() - ".__init__".length());
} else if (name.equals("__init__")) {
name = new File(sys.getCurrentWorkingDir()).getName();
}
File fp = new File(resolvedFilename);
long mtime = -1;
if (fp.isFile()) {
mtime = fp.lastModified();
}
mod = org.python.core.imp.createFromSource(name.intern(),
(InputStream)o,
filename.toString(),
compiledName,
mtime);
break;
case PY_COMPILED:
mod = load_compiled(name, filename.toString(), file);
break;
case PKG_DIRECTORY:
PyModule m = org.python.core.imp.addModule(name);
m.__dict__.__setitem__("__path__", new PyList(new PyObject[] {filename}));
m.__dict__.__setitem__("__file__", filename);
ModuleInfo mi = findFromSource(name, filename.toString(), true, true);
type = mi.type;
file = mi.file;
filename = new PyString(mi.filename);
break;
default:
throw Py.ImportError("No module named " + name);
}
}
PyObject modules = sys.modules;
modules.__setitem__(name.intern(), mod);
return mod;
}
public static PyObject get_magic() {
return new PyString("\u0003\u00f3\r\n");
}
public static PyObject get_suffixes() {
return new PyList(new PyObject[] {new PyTuple(new PyString(".py"),
new PyString("r"),
Py.newInteger(PY_SOURCE)),
new PyTuple(new PyString("$py.class"),
new PyString("rb"),
Py.newInteger(PY_COMPILED)),});
}
public static PyModule new_module(String name) {
return new PyModule(name, null);
}
public static boolean is_builtin(String name) {
return PySystemState.getBuiltin(name) != null;
}
public static boolean is_frozen(String name) {
return false;
}
/**
* Acquires the interpreter's import lock for the current thread.
*
* This lock should be used by import hooks to ensure
* thread-safety when importing modules.
*
*/
public static void acquire_lock() {
org.python.core.imp.importLock.lock();
}
/**
* Release the interpreter's import lock.
*
*/
public static void release_lock() {
try{
org.python.core.imp.importLock.unlock();
}catch(IllegalMonitorStateException e){
throw Py.RuntimeError("not holding the import lock");
}
}
/**
* Return true if the import lock is currently held, else false.
*
* @return true if the import lock is currently held, else false.
*/
public static boolean lock_held() {
return org.python.core.imp.importLock.isHeldByCurrentThread();
}
}