def check_cython_imports(t, exp):
obs = ts.cython_imports(t)
assert_equal(obs, exp)
def genpyx(desc, env=None):
"""Generates a ``*.pyx`` Cython wrapper implementation for exposing a C/C++
class based off of a dictionary description. The environment is a
dictionary of all class names known to their descriptions.
Parameters
----------
desc : dict
Class description dictonary.
env : env, optional
Environment dictionary which maps all class names that are required to
their own descriptions. This is required for resolved class heirarchy
dependencies.
Returns
-------
pyx : str
Cython ``*.pyx`` implementation file as in-memory string.
"""
if env is None:
env = {desc['name']: desc}
nodocmsg = "no docstring for {0}, please file a bug report!"
pars = ', '.join([cython_cytype(p) for p in desc['parents'] or ()])
d = {'parents': pars if 0 == len(pars) else '('+pars+')'}
copy_from_desc = ['name', 'namespace', 'header_filename']
for key in copy_from_desc:
d[key] = desc[key]
d['module_docstring'] = desc.get('docstrings', {})\
.get('module', nodocmsg.format(desc['name'].lower()))
class_doc = desc.get('docstrings', {}).get('class', nodocmsg.format(desc['name']))
d['class_docstring'] = indent('\"\"\"{0}\"\"\"'.format(class_doc))
class_ctype = cython_ctype(desc['name'])
inst_name = "(<{0} *> self._inst)".format(class_ctype)
import_tups = set()
cimport_tups = set()
for parent in desc['parents'] or ():
cython_import_tuples(parent, import_tups)
cython_cimport_tuples(parent, cimport_tups)
alines = []
cached_names = []
attritems = sorted(desc['attrs'].items())
for aname, atype in attritems:
if aname.startswith('_'):
continue # skip private
adoc = desc.get('docstrings', {}).get('attrs', {})\
.get(aname, nodocmsg.format(aname))
alines += _gen_property(aname, atype, adoc, cached_names=cached_names,
inst_name=inst_name)
cython_import_tuples(atype, import_tups)
cython_cimport_tuples(atype, cimport_tups)
d['attrs_block'] = indent(alines)
pd = ["{0} = None".format(n) for n in cached_names]
d['property_defaults'] = indent(indent(pd, join=False))
mlines = []
clines = []
methcounts = _count0(desc['methods'])
currcounts = {k: 0 for k in methcounts}
mangled_mnames = {}
methitems = sorted(desc['methods'].items())
for mkey, mrtn in methitems:
mname, margs = mkey[0], mkey[1:]
if mname.startswith('_'):
continue # skip private
if 1 < methcounts[mname]:
mname_mangled = "_{0}_{1}_{2:0{3}}".format(desc['name'], mname,
currcounts[mname], int(math.log(methcounts[mname], 10)+1)).lower()
else:
mname_mangled = mname
currcounts[mname] += 1
mangled_mnames[mkey] = mname_mangled
for a in margs:
cython_import_tuples(a[1], import_tups)
cython_cimport_tuples(a[1], cimport_tups)
minst_name, mcname = _method_instance_names(desc, env, mkey, mrtn)
if mcname != desc['name']:
cython_import_tuples(mcname, import_tups)
cython_cimport_tuples(mcname, cimport_tups)
if mrtn is None:
# this must be a constructor
if mname not in (desc['name'], '__init__'):
continue # skip destuctors
if 1 == methcounts[mname]:
mname_mangled = '__init__'
mangled_mnames[mkey] = mname_mangled
mdoc = desc.get('docstrings', {}).get('methods', {}).get(mname, '')
mdoc = _doc_add_sig(mdoc, mname, margs)
clines += _gen_constructor(mname, mname_mangled,
desc['name'], margs, doc=mdoc,
cpppxd_filename=desc['cpppxd_filename'],
inst_name=minst_name)
if 1 < methcounts[mname] and currcounts[mname] == methcounts[mname]:
# write dispatcher
nm = {k: v for k, v in mangled_mnames.iteritems() if k[0] == mname}
clines += _gen_dispatcher('__init__', nm, doc=mdoc, hasrtn=False)
else:
# this is a normal method
cython_import_tuples(mrtn, import_tups)
cython_cimport_tuples(mrtn, cimport_tups)
mdoc = desc.get('docstrings', {}).get('methods', {})\
.get(mname, nodocmsg.format(mname))
mdoc = _doc_add_sig(mdoc, mname, margs)
mlines += _gen_method(mname, mname_mangled, margs, mrtn, mdoc,
inst_name=minst_name)
if 1 < methcounts[mname] and currcounts[mname] == methcounts[mname]:
# write dispatcher
nm = {k: v for k, v in mangled_mnames.iteritems() if k[0] == mname}
mlines += _gen_dispatcher(mname, nm, doc=mdoc)
if desc['parents'] is None:
clines += ["def __dealloc__(self):"]
clines += indent("if self._free_inst:", join=False)
clines += indent(indent("free(self._inst)", join=False), join=False)
cimport_tups.add(('libc.stdlib', 'free'))
d['methods_block'] = indent(mlines)
d['constructor_block'] = indent(clines)
d['imports'] = "\n".join(sorted(cython_imports(import_tups)))
d['cimports'] = "\n".join(sorted(cython_cimports(cimport_tups)))
if 'numpy' in d['cimports']:
d['imports'] += "\n\nnp.import_array()"
d['extra'] = desc.get('extra', {}).get('pyx', '')
pyx = _pyx_template.format(**d)
if 'pyx_filename' not in desc:
desc['pyx_filename'] = '{0}.pyx'.format(d['name'].lower())
return pyx
