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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.
// Copyright 2001 Finn Bock
package org.python.core;
import java.io.File;
import java.lang.reflect.Method;
import org.python.modules._locale._locale;
import org.python.modules.zipimport.zipimport;
/**
* The builtin exceptions module. The entire module should be imported from
* python. None of the methods defined here should be called from java.
*/
@Untraversable
public class exceptions extends PyObject implements ClassDictInit {
public static String __doc__ = "Python's standard exception class hierarchy.\n"
+ "\n"
+ "Exceptions found here are defined both in the exceptions module and the\n"
+ "built-in namespace. It is recommended that user-defined exceptions\n"
+ "inherit from Exception. See the documentation for the exception\n"
+ "inheritance hierarchy.\n";
/** Internal use only. Do not call this method explicit. */
public static void classDictInit(PyObject dict) {
dict.invoke("clear");
dict.__setitem__("__name__", new PyString("exceptions"));
dict.__setitem__("__doc__", new PyString(__doc__));
ThreadState ts = Py.getThreadState();
if (ts.getSystemState() == null) { // TODO: is this check still useful??
ts.setSystemState(Py.defaultSystemState);
}
// Push frame
PyFrame frame = new PyFrame(null, new PyStringMap());
frame.f_back = ts.frame;
if (frame.f_builtins == null) {
if (frame.f_back != null) {
frame.f_builtins = frame.f_back.f_builtins;
} else {
frame.f_builtins = PySystemState.getDefaultBuiltins();
}
}
ts.frame = frame;
dict.__setitem__("BaseException", PyBaseException.TYPE);
buildClass(dict, "KeyboardInterrupt", "BaseException", "Program interrupted by user.");
buildClass(dict, "SystemExit", "BaseException", SystemExit(),
"Request to exit from the interpreter.");
buildClass(dict, "Exception", "BaseException",
"Common base class for all non-exit exceptions.");
buildClass(dict, "StandardError", "Exception",
"Base class for all standard Python exceptions that do not represent\n"
+ "interpreter exiting.");
buildClass(dict, "SyntaxError", "StandardError", SyntaxError(), "Invalid syntax.");
buildClass(dict, "IndentationError", "SyntaxError", "Improper indentation.");
buildClass(dict, "TabError", "IndentationError", "Improper mixture of spaces and tabs.");
buildClass(dict, "EnvironmentError", "StandardError", EnvironmentError(),
"Base class for I/O related errors.");
buildClass(dict, "IOError", "EnvironmentError", "I/O operation failed.");
buildClass(dict, "OSError", "EnvironmentError", "OS system call failed.");
buildClass(dict, "RuntimeError", "StandardError", "Unspecified run-time error.");
buildClass(dict, "NotImplementedError", "RuntimeError",
"Method or function hasn't been implemented yet.");
buildClass(dict, "SystemError", "StandardError",
"Internal error in the Python interpreter.\n\n"
+ "Please report this to the Python maintainer, "
+ "along with the traceback,\n"
+ "the Python version, and the hardware/OS "
+ "platform and version.");
buildClass(dict, "ReferenceError", "StandardError",
"Weak ref proxy used after referent went away.");
buildClass(dict, "EOFError", "StandardError", "Read beyond end of file.");
buildClass(dict, "ImportError", "StandardError",
"Import can't find module, or can't find name in module.");
buildClass(dict, "TypeError", "StandardError", "Inappropriate argument type.");
buildClass(dict, "ValueError", "StandardError",
"Inappropriate argument value (of correct type).");
buildClass(dict, "UnicodeError", "ValueError", "Unicode related error.");
buildClass(dict, "UnicodeEncodeError", "UnicodeError", UnicodeEncodeError(),
"Unicode encoding error.");
buildClass(dict, "UnicodeDecodeError", "UnicodeError", UnicodeDecodeError(),
"Unicode decoding error.");
buildClass(dict, "UnicodeTranslateError", "UnicodeError", UnicodeTranslateError(),
"Unicode translation error.");
buildClass(dict, "AssertionError", "StandardError", "Assertion failed.");
buildClass(dict, "ArithmeticError", "StandardError", "Base class for arithmetic errors.");
buildClass(dict, "OverflowError", "ArithmeticError",
"Result too large to be represented.");
buildClass(dict, "FloatingPointError", "ArithmeticError",
"Floating point operation failed.");
buildClass(dict, "ZeroDivisionError", "ArithmeticError",
"Second argument to a division or modulo operation "
+ "was zero.");
buildClass(dict, "LookupError", "StandardError", "Base class for lookup errors.");
buildClass(dict, "IndexError", "LookupError", "Sequence index out of range.");
buildClass(dict, "KeyError", "LookupError", KeyError(), "Mapping key not found.");
buildClass(dict, "AttributeError", "StandardError", "Attribute not found.");
buildClass(dict, "NameError", "StandardError", "Name not found globally.");
buildClass(dict, "UnboundLocalError", "NameError",
"Local name referenced but not bound to a value.");
buildClass(dict, "MemoryError", "StandardError", "Out of memory.");
buildClass(dict, "BufferError", "StandardError", "Buffer error.");
buildClass(dict, "StopIteration", "Exception",
"Signal the end from iterator.next().");
buildClass(dict, "GeneratorExit", "BaseException", "Request that a generator exit.");
buildClass(dict, "Warning", "Exception", "Base class for warning categories.");
buildClass(dict, "UserWarning", "Warning",
"Base class for warnings generated by user code.");
buildClass(dict, "DeprecationWarning", "Warning",
"Base class for warnings about deprecated features.");
buildClass(dict, "PendingDeprecationWarning", "Warning",
"Base class for warnings about features which will be deprecated\n"
+ "in the future.");
buildClass(dict, "SyntaxWarning", "Warning",
"Base class for warnings about dubious syntax.");
buildClass(dict, "RuntimeWarning", "Warning",
"Base class for warnings about dubious runtime behavior.");
buildClass(dict, "FutureWarning", "Warning",
"Base class for warnings about constructs that will change semantically\n"
+ "in the future.");
buildClass(dict, "ImportWarning", "Warning",
"Base class for warnings about probable mistakes in module imports");
buildClass(dict, "UnicodeWarning", "Warning",
"Base class for warnings about Unicode related problems, mostly\n"
+ "related to conversion problems.");
buildClass(dict, "BytesWarning", "Warning",
"Base class for warnings about bytes and buffer related problems, mostly\n"
+ "related to conversion from str or comparing to str.");
buildModuleExceptions(dict);
ts.frame = ts.frame.f_back;
}
// Native modules exposing errors as part of their public interface
private static void buildModuleExceptions(PyObject dict) {
// Initialize ZipImportError here, where it's safe to; it's needed immediately
zipimport.initClassExceptions(dict);
_locale.initClassExceptions(dict);
}
public static PyObject SyntaxError() {
PyObject __dict__ = new PyStringMap();
defineSlots(__dict__, "msg", "filename", "lineno", "offset", "text",
"print_file_and_line");
__dict__.__setitem__("__init__", bindStaticJavaMethod("__init__", "SyntaxError__init__"));
__dict__.__setitem__("__str__", bindStaticJavaMethod("__str__", "SyntaxError__str__"));
return __dict__;
}
public static void SyntaxError__init__(PyObject self, PyObject[] args, String[] kwargs) {
PyBaseException.TYPE.invoke("__init__", self, args, kwargs);
initSlots(self);
if (args.length >= 1) {
self.__setattr__("msg", args[0]);
}
if (args.length == 2) {
PyObject[] info = Py.make_array(args[1]);
if (info.length != 4) {
throw Py.IndexError("tuple index out of range");
}
self.__setattr__("filename", info[0]);
self.__setattr__("lineno", info[1]);
self.__setattr__("offset", info[2]);
self.__setattr__("text", info[3]);
}
}
public static PyString SyntaxError__str__(PyObject self, PyObject[] arg, String[] kwargs) {
PyObject msg = self.__getattr__("msg");
PyObject str = msg.__str__();
if (!(msg instanceof PyString)) {
return Py.newString(str.toString());
}
PyObject filename = self.__findattr__("filename");
PyObject lineno = self.__findattr__("lineno");
boolean haveFilename = filename instanceof PyString;
boolean haveLieno = lineno instanceof PyInteger;
if (!haveFilename && !haveLieno) {
return (PyString)str;
}
String result;
if (haveFilename && haveLieno) {
result = String.format("%s (%s, line %d)", str, basename(filename.toString()),
lineno.asInt());
} else if (haveFilename) {
result = String.format("%s (%s)", str, basename(filename.toString()));
} else {
result = String.format("%s (line %d)", str, lineno.asInt());
}
return Py.newString(result);
}
public static PyObject EnvironmentError() {
PyObject dict = new PyStringMap();
defineSlots(dict, "errno", "strerror", "filename");
dict.__setitem__("__init__", bindStaticJavaMethod("__init__", "EnvironmentError__init__"));
dict.__setitem__("__str__", bindStaticJavaMethod("__str__", "EnvironmentError__str__"));
dict.__setitem__("__reduce__", bindStaticJavaMethod("__reduce__", "EnvironmentError__reduce__"));
return dict;
}
public static void EnvironmentError__init__(PyObject self, PyObject[] args, String[] kwargs) {
PyBaseException.TYPE.invoke("__init__", self, args, kwargs);
initSlots(self);
if (args.length <= 1 || args.length > 3) {
return;
}
PyObject errno = args[0];
PyObject strerror = args[1];
self.__setattr__("errno", errno);
self.__setattr__("strerror", strerror);
if (args.length == 3) {
self.__setattr__("filename", args[2]);
self.__setattr__("args", new PyTuple(errno, strerror));
}
}
public static PyObject EnvironmentError__str__(PyObject self, PyObject[] args,
String[] kwargs) {
PyObject errno = self.__findattr__("errno");
PyObject strerror = self.__findattr__("strerror");
PyObject filename = self.__findattr__("filename");
PyString result;
if (filename.__nonzero__()) {
result = Py.newString("[Errno %s] %s: %s");
result = (PyString)result.__mod__(new PyTuple(errno, strerror, filename.__repr__()));
} else if (errno.__nonzero__() && strerror.__nonzero__()) {
result = Py.newString("[Errno %s] %s");
result = (PyString)result.__mod__(new PyTuple(errno, strerror));
} else {
return PyBaseException.TYPE.invoke("__str__", self, args, kwargs);
}
return result;
}
public static PyObject EnvironmentError__reduce__(PyObject self, PyObject[] args,
String[] kwargs) {
PyBaseException selfBase = (PyBaseException)self;
PyObject reduceArgs = selfBase.args;
PyObject filename = self.__findattr__("filename");
// self->args is only the first two real arguments if there was a file name given
// to EnvironmentError
if (selfBase.args.__len__() == 2 && filename != null) {
reduceArgs = new PyTuple(selfBase.args.__finditem__(0),
selfBase.args.__finditem__(1),
filename);
}
if (selfBase.__dict__ != null) {
return new PyTuple(selfBase.getType(), reduceArgs, selfBase.__dict__);
} else {
return new PyTuple(selfBase.getType(), reduceArgs);
}
}
public static PyObject SystemExit() {
PyObject dict = new PyStringMap();
defineSlots(dict, "code");
dict.__setitem__("__init__", bindStaticJavaMethod("__init__", "SystemExit__init__"));
return dict;
}
public static void SystemExit__init__(PyObject self, PyObject[] args, String[] kwargs) {
PyBaseException.TYPE.invoke("__init__", self, args, kwargs);
initSlots(self);
if (args.length == 1) {
self.__setattr__("code", args[0]);
} else if (args.length > 1) {
self.__setattr__("code", new PyTuple(args));
}
}
public static PyObject KeyError() {
PyObject dict = new PyStringMap();
dict.__setitem__("__str__", bindStaticJavaMethod("__str__", "KeyError__str__"));
return dict;
}
public static PyObject KeyError__str__(PyObject self, PyObject[] args, String[] kwargs) {
PyBaseException selfBase = (PyBaseException)self;
// If args is a tuple of exactly one item, apply repr to args[0].
// This is done so that e.g. the exception raised by {}[''] prints
// KeyError: ''
// rather than the confusing
// KeyError
// alone. The downside is that if KeyError is raised with an explanatory
// string, that string will be displayed in quotes. Too bad.
if (selfBase.args.__len__() == 1) {
return selfBase.args.__getitem__(0).__repr__();
}
return PyBaseException.TYPE.invoke("__str__", self, args, kwargs);
}
public static PyObject UnicodeError() {
PyObject dict = new PyStringMap();
defineSlots(dict, "encoding", "object", "start", "end", "reason");
// NOTE: UnicodeError doesn't actually use its own constructor
return dict;
}
public static void UnicodeError__init__(PyObject self, PyObject[] args, String[] kwargs,
PyType objectType) {
ArgParser ap = new ArgParser("__init__", args, kwargs,
new String[] {"encoding", "object", "start", "end",
"reason" },
5);
self.__setattr__("encoding", ap.getPyObjectByType(0, PyString.TYPE));
self.__setattr__("object", ap.getPyObjectByType(1, objectType));
self.__setattr__("start", ap.getPyObjectByType(2, PyInteger.TYPE));
self.__setattr__("end", ap.getPyObjectByType(3, PyInteger.TYPE));
self.__setattr__("reason", ap.getPyObjectByType(4, PyString.TYPE));
}
public static PyObject UnicodeDecodeError() {
PyObject dict = new PyStringMap();
dict.__setitem__("__init__", bindStaticJavaMethod("__init__",
"UnicodeDecodeError__init__"));
dict.__setitem__("__str__", bindStaticJavaMethod("__str__", "UnicodeDecodeError__str__"));
return dict;
}
public static void UnicodeDecodeError__init__(PyObject self, PyObject[] args,
String[] kwargs) {
PyBaseException.TYPE.invoke("__init__", self, args, kwargs);
UnicodeError__init__(self, args, kwargs, PyString.TYPE);
}
public static PyString UnicodeDecodeError__str__(PyObject self, PyObject[] args,
String[] kwargs) {
int start = self.__getattr__("start").asInt();
int end = self.__getattr__("end").asInt();
// Get reason and encoding as strings, which they might not be if they've been
// modified after we were contructed
PyObject reason = self.__getattr__("reason").__str__();
PyObject encoding = self.__getattr__("encoding").__str__();
PyObject object = getString(self.__getattr__("object"), "object");
String result;
if (start < object.__len__() && end == (start + 1)) {
int badByte = (object.toString().charAt(start)) & 0xff;
result = String.format("'%.400s' codec can't decode byte 0x%x in position %d: %.400s",
encoding, badByte, start, reason);
} else {
result = String.format("'%.400s' codec can't decode bytes in position %d-%d: %.400s",
encoding, start, end - 1, reason);
}
return Py.newString(result);
}
public static PyObject UnicodeEncodeError() {
PyObject dict = new PyStringMap();
dict.__setitem__("__init__", bindStaticJavaMethod("__init__",
"UnicodeEncodeError__init__"));
dict.__setitem__("__str__", bindStaticJavaMethod("__str__", "UnicodeEncodeError__str__"));
return dict;
}
public static void UnicodeEncodeError__init__(PyObject self, PyObject[] args, String[] kwargs) {
PyBaseException.TYPE.invoke("__init__", self, args, kwargs);
UnicodeError__init__(self, args, kwargs, PyUnicode.TYPE);
}
public static PyString UnicodeEncodeError__str__(PyObject self, PyObject[] args,
String[] kwargs) {
int start = self.__getattr__("start").asInt();
int end = self.__getattr__("end").asInt();
// Get reason and encoding as strings, which they might not be if they've been
// modified after we were contructed
PyObject reason = self.__getattr__("reason").__str__();
PyObject encoding = self.__getattr__("encoding").__str__();
PyObject object = getUnicode(self.__getattr__("object"), "object");
String result;
if (start < object.__len__() && end == (start + 1)) {
int badchar = object.toString().codePointAt(start);
String badcharStr;
if (badchar <= 0xff) {
badcharStr = String.format("x%02x", badchar);
} else if (badchar <= 0xffff) {
badcharStr = String.format("u%04x", badchar);
} else {
badcharStr = String.format("U%08x", badchar);
}
result = String.format("'%.400s' codec can't encode character u'\\%s' in position %d: "
+ "%.400s", encoding, badcharStr, start, reason);
} else {
result = String.format("'%.400s' codec can't encode characters in position %d-%d: "
+ "%.400s", encoding, start, end - 1, reason);
}
return Py.newString(result);
}
public static PyObject UnicodeTranslateError() {
PyObject dict = new PyStringMap();
dict.__setitem__("__init__", bindStaticJavaMethod("__init__",
"UnicodeTranslateError__init__"));
dict.__setitem__("__str__", bindStaticJavaMethod("__str__",
"UnicodeTranslateError__str__"));
return dict;
}
public static void UnicodeTranslateError__init__(PyObject self, PyObject[] args,
String[] kwargs) {
PyBaseException.TYPE.invoke("__init__", self, args, kwargs);
ArgParser ap = new ArgParser("__init__", args, kwargs,
new String[] {"object", "start", "end", "reason"},
4);
self.__setattr__("object", ap.getPyObjectByType(0, PyUnicode.TYPE));
self.__setattr__("start", ap.getPyObjectByType(1, PyInteger.TYPE));
self.__setattr__("end", ap.getPyObjectByType(2, PyInteger.TYPE));
self.__setattr__("reason", ap.getPyObjectByType(3, PyString.TYPE));
}
public static PyString UnicodeTranslateError__str__(PyObject self, PyObject[] args,
String[] kwargs) {
int start = self.__getattr__("start").asInt();
int end = self.__getattr__("end").asInt();
// Get reason as a string, which it might not be if it's been modified after we
// were contructed
PyObject reason = self.__getattr__("reason").__str__();
PyObject object = getUnicode(self.__getattr__("object"), "object");
String result;
if (start < object.__len__() && end == (start + 1)) {
int badchar = object.toString().codePointAt(start);
String badCharStr;
if (badchar <= 0xff) {
badCharStr = String.format("x%02x", badchar);
} else if (badchar <= 0xffff) {
badCharStr = String.format("u%04x", badchar);
} else {
badCharStr = String.format("U%08x", badchar);
}
result = String.format("can't translate character u'\\%s' in position %d: %.400s",
badCharStr, start, reason);
} else {
result = String.format("can't translate characters in position %d-%d: %.400s",
start, end - 1, reason);
}
return Py.newString(result);
}
/**
* Determine the start position for UnicodeErrors.
*
* @param self a UnicodeError value
* @param unicode whether the UnicodeError object should be
* unicode
* @return an the start position
*/
public static int getStart(PyObject self, boolean unicode) {
int start = self.__getattr__("start").asInt();
PyObject object;
if (unicode) {
object = getUnicode(self.__getattr__("object"), "object");
} else {
object = getString(self.__getattr__("object"), "object");
}
if (start < 0) {
start = 0;
}
if (start >= object.__len__()) {
start = object.__len__() - 1;
}
return start;
}
/**
* Determine the end position for UnicodeErrors.
*
* @param self a UnicodeError value
* @param unicode whether the UnicodeError object should be
* unicode
* @return an the end position
*/
public static int getEnd(PyObject self, boolean unicode) {
int end = self.__getattr__("end").asInt();
PyObject object;
if (unicode) {
object = getUnicode(self.__getattr__("object"), "object");
} else {
object = getString(self.__getattr__("object"), "object");
}
if (end < 1) {
end = 1;
}
if (end > object.__len__()) {
end = object.__len__();
}
return end;
}
/**
* Ensure a PyString value for UnicodeErrors
*
* @param attr a PyObject
* @param name of the attribute
* @return an PyString
*/
public static PyString getString(PyObject attr, String name) {
if (!Py.isInstance(attr, PyString.TYPE)) {
throw Py.TypeError(String.format("%.200s attribute must be str", name));
}
return (PyString)attr;
}
/**
* Ensure a PyUnicode value for UnicodeErrors
*
* @param attr a PyObject
* @param name of the attribute
* @return an PyUnicode
*/
public static PyUnicode getUnicode(PyObject attr, String name) {
if (!(attr instanceof PyUnicode)) {
throw Py.TypeError(String.format("%.200s attribute must be unicode", name));
}
return (PyUnicode)attr;
}
/**
* Return the basename of a path string.
*
* @param name a path String
* @return the basename'd result String
*/
private static String basename(String name) {
int lastSep = name.lastIndexOf(File.separatorChar);
if (lastSep > -1) {
return name.substring(lastSep + 1, name.length());
}
return name;
}
/**
* Define __slots__ in dict with the specified slot names
*
* @param dict a PyObject dict
* @param slotNames slot String names
*/
private static void defineSlots(PyObject dict, String... slotNames) {
PyObject[] slots = new PyObject[slotNames.length];
for (int i = 0; i < slotNames.length; i++) {
slots[i] = Py.newString(slotNames[i]);
}
dict.__setitem__("__slots__", new PyTuple(slots));
}
/**
* Initialize all __slots__ arguments in the specified dict to
* None.
*
* @param self a PyObject dict
*/
private static void initSlots(PyObject self) {
for (PyObject name : self.__findattr__("__slots__").asIterable()) {
if (!(name instanceof PyString)) {
continue;
}
self.__setattr__((PyString)name, Py.None);
}
}
private static PyObject buildClass(PyObject dict, String classname, String superclass,
String doc) {
return buildClass(dict, classname, superclass, new PyStringMap(), doc);
}
private static PyObject buildClass(PyObject dict, String classname, String superclass,
PyObject classDict, String doc) {
classDict.__setitem__("__doc__", Py.newString(doc));
PyType type = (PyType)Py.makeClass("exceptions." + classname,
dict.__finditem__(superclass), classDict);
type.builtin = true;
dict.__setitem__(classname, type);
return type;
}
public static PyObject bindStaticJavaMethod(String name, String methodName) {
return bindStaticJavaMethod(name, exceptions.class, methodName);
}
public static PyObject bindStaticJavaMethod(String name, Class cls, String methodName) {
Method javaMethod;
try {
javaMethod = cls.getMethod(methodName,
new Class[] {PyObject.class, PyObject[].class,
String[].class});
} catch (Exception e) {
throw Py.JavaError(e);
}
return new BoundStaticJavaMethod(name, javaMethod);
}
@Untraversable
static class BoundStaticJavaMethod extends PyBuiltinMethod {
/** The Java Method to be bound. Its signature must be:
* (PyObject, PyObject[], String[])PyObject. */
private Method javaMethod;
public BoundStaticJavaMethod(String name, Method javaMethod) {
super(name);
this.javaMethod = javaMethod;
}
protected BoundStaticJavaMethod(PyType type, PyObject self, Info info, Method javaMethod) {
super(type, self, info);
this.javaMethod = javaMethod;
}
@Override
public PyBuiltinCallable bind(PyObject self) {
return new BoundStaticJavaMethod(getType(), self, info, javaMethod);
}
@Override
public PyObject __get__(PyObject obj, PyObject type) {
if (obj != null) {
return bind(obj);
}
return makeDescriptor((PyType)type);
}
@Override
public PyObject __call__(PyObject[] args, String kwargs[]) {
try {
return Py.java2py(javaMethod.invoke(null, self, args, kwargs));
} catch (Throwable t) {
throw Py.JavaError(t);
}
}
}
}