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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.
"""generates code for binops in PyObject and for all "simple" ops in PyInstance"""
binops = \
[('add', '+'), ('sub', '-'), ('mul', '*'), ('div', '/'),
('floordiv', '//'), ('truediv', '/'),
('mod', '%'), ('divmod', 'divmod'), ('pow', '**'),
('lshift', '<<'), ('rshift', '>>'), ('and', '&'), ('or', '|'), ('xor', '^')]
#
# this bit is superseded by src/templates/make_binops.py
#
## template = """\
## /**
## * Equivalent to the standard Python __%(name)s__ method
## * @param other the object to perform this binary operation with
## * (the right-hand operand).
## * @return the result of the %(name)s, or null if this operation
## * is not defined
## **/
## public PyObject __%(name)s__(PyObject other) { %(function)s }
## /**
## * Equivalent to the standard Python __r%(name)s__ method
## * @param other the object to perform this binary operation with
## * (the left-hand operand).
## * @return the result of the %(name)s, or null if this operation
## * is not defined.
## **/
## public PyObject __r%(name)s__(PyObject other) { %(rfunction)s }
## /**
## * Equivalent to the standard Python __i%(name)s__ method
## * @param other the object to perform this binary operation with
## * (the right-hand operand).
## * @return the result of the %(name)s, or null if this operation
## * is not defined
## **/
## public PyObject __i%(name)s__(PyObject other) { return _%(name)s(other); }
## /**
## * Implements the Python expression this %(op)s other
## * @param other the object to perform this binary operation with.
## * @return the result of the %(name)s.
## * @exception PyTypeError if this operation can't be performed
## * with these operands.
## **/
## public final PyObject _%(name)s(PyObject o2) {%(divhook)s
## PyObject x = __%(name)s__(o2);
## if (x != null)
## return x;
## x = o2.__r%(name)s__(this);
## if (x != null)
## return x;
## throw Py.TypeError(
## "__%(name)s__ nor __r%(name)s__ defined for these operands");
## }
## """
## fp = open('binops.txt', 'w')
## fp.write(' // Generated by make_binops.py (Begin)\n\n')
## for name, op in binops:
## rfunction = function = 'return null;'
## divhook = ""
## if name == 'pow':
## function = 'return __pow__(other, null);'
## if name == 'div':
## divhook = '''
## if (Options.Qnew)
## return _truediv(o2);'''
## fp.write(template % {
## 'name':name,
## 'op':op,
## 'function':function,
## 'rfunction':rfunction,
## 'divhook':divhook
## })
## fp.write(' // Generated by make_binops.py (End)\n\n')
## fp.close()
fp = open('binopsi.txt', 'w')
fp.write(' // Generated by make_binops.py\n\n')
comment = """\
/**
* Implements the __%(name)s__ method by looking it up
* in the instance's dictionary and calling it if it is found.
**/
"""
template1 = """\
@Override
public %(ret)s __%(name)s__() {
return instance___%(name)s__();
}
""" + comment + """\
@ExposedMethod
final %(ret)s instance___%(name)s__() {
PyObject ret = invoke("__%(name)s__");
if (%(checks)s)
return %(cast)sret;
throw Py.TypeError("__%(name)s__() should return a %(retname)s");
}
"""
template2 = """\
@Override
public PyObject __%(name)s__() {
return instance___%(name)s__();
}
""" + comment + """\
@ExposedMethod
public PyObject instance___%(name)s__() {
return invoke("__%(name)s__");
}
"""
string = 'PyString', 'string'
ops = [('hex', string), ('oct', string),
('int', ('PyObject', 'int'), ('PyLong', 'PyInteger')),
('float', ('PyFloat', 'float')),
('long', ('PyObject', 'long'), ('PyLong', 'PyInteger')),
('complex', ('PyComplex', 'complex')),
('pos', None), ('neg', None), ('abs', None), ('invert', None)]
fp.write(' // Unary ops\n\n')
for item in ops:
checks = None
if len(item) == 2:
name, ret = item
else:
name, ret, checks = item
if ret is None:
fp.write(template2 % {'name':name})
else:
ret, retname = ret
if checks:
checks = ' || '.join(['ret instanceof %s' % check for check in checks])
else:
checks = 'ret instanceof %s' % ret
if ret == 'PyObject':
cast = ''
else:
cast = '(%s)' % ret
fp.write(template1 % {'name':name, 'ret':ret, 'retname':retname,
'checks':checks, 'cast':cast})
template = """\
@Override
public PyObject __%(name)s__(PyObject o) {
return instance___%(name)s__(o);
}
""" + comment + """\
@ExposedMethod(type = MethodType.BINARY)
public PyObject instance___%(name)s__(PyObject o) {
Object ctmp = __coerce_ex__(o);
if (ctmp == null || ctmp == Py.None)
return invoke_ex("__%(name)s__", o);
else {
PyObject o1 = ((PyObject[])ctmp)[0];
PyObject o2 = ((PyObject[])ctmp)[1];
if (this == o1) {
// Prevent recusion if __coerce__ return self
return invoke_ex("__%(name)s__", o2);
}
else {
ThreadState ts = Py.getThreadState();
if (ts.recursion_depth++ > ts.systemState.getrecursionlimit())
throw Py.RuntimeError("maximum recursion depth exceeded");
try {
return %(function)s;
} finally {
--ts.recursion_depth;
}
}
}
}
"""
template2 = """\
@Override
public PyObject __%(name)s__(PyObject o) {
return instance___%(name)s__(o);
}
""" + comment + """\
@ExposedMethod(type = MethodType.BINARY)
public PyObject instance___%(name)s__(PyObject o) {
PyObject ret = invoke_ex("__%(name)s__", o);
if (ret != null)
return ret;
return super.__%(name)s__(o);
}
"""
fp.write(' // Binary ops\n\n')
for name, op in binops:
fp.write(template % {'name':name, 'function':'o1._%s(o2)' % name })
fp.write(template % {'name':'r'+name, 'function':'o2._%s(o1)' % name })
if name != 'divmod':
fp.write(template2 % {'name':'i'+name
})
fp.close()