ref: 81fe32734168e80d53cd575535a63ce99b1eb6a0
dir: /python/gen_pyobject.py/
#! /usr/bin/python """ This madness of code is used to generate the C code of the python interface to aubio. Don't try this at home. The list of typedefs and functions is obtained from the command line 'cpp aubio.h'. This list is then used to parse all the functions about this object. I hear the ones asking "why not use swig, or cython, or something like that?" The requirements for this extension are the following: - aubio vectors can be viewed as numpy arrays, and vice versa - aubio 'object' should be python classes, not just a bunch of functions I haven't met any python interface generator that can meet both these requirements. If you know of one, please let me know, it will spare me maintaining this bizarre file. """ param_numbers = { 'source': [0, 2], 'sink': [2, 0], } # TODO # do function: for now, only the following pattern is supported: # void aubio_<foo>_do (aubio_foo_t * o, # [input1_t * input, [output1_t * output, ..., output3_t * output]]); # There is no way of knowing that output1 is actually input2. In the future, # const could be used for the inputs in the C prototypes. def write_msg(*args): pass # uncomment out for debugging #print args def split_type(arg): """ arg = 'foo *name' return ['foo*', 'name'] """ l = arg.split() type_arg = {'type': l[0], 'name': l[1]} # ['foo', '*name'] -> ['foo*', 'name'] if l[-1].startswith('*'): #return [l[0]+'*', l[1][1:]] type_arg['type'] = l[0] + '*' type_arg['name'] = l[1][1:] # ['foo', '*', 'name'] -> ['foo*', 'name'] if len(l) == 3: #return [l[0]+l[1], l[2]] type_arg['type'] = l[0]+l[1] type_arg['name'] = l[2] else: #return l pass return type_arg def get_params(proto): """ get the list of parameters from a function prototype example: proto = "int main (int argc, char ** argv)" returns: ['int argc', 'char ** argv'] """ import re paramregex = re.compile('[\(, ](\w+ \*?\*? ?\w+)[, \)]') return paramregex.findall(proto) def get_params_types_names(proto): """ get the list of parameters from a function prototype example: proto = "int main (int argc, char ** argv)" returns: [['int', 'argc'], ['char **','argv']] """ return map(split_type, get_params(proto)) def get_return_type(proto): import re paramregex = re.compile('(\w+ ?\*?).*') outputs = paramregex.findall(proto) assert len(outputs) == 1 return outputs[0].replace(' ', '') def get_name(proto): name = proto.split()[1].split('(')[0] return name.replace('*','') # the important bits: the size of the output for each objects. this data should # move into the C library at some point. defaultsizes = { 'resampler': ['input->length * self->ratio'], 'specdesc': ['1'], 'onset': ['1'], 'pitchyin': ['1'], 'pitchyinfft': ['1'], 'pitchschmitt': ['1'], 'pitchmcomb': ['1'], 'pitchfcomb': ['1'], 'pitch': ['1'], 'tss': ['self->buf_size', 'self->buf_size'], 'mfcc': ['self->n_coeffs'], 'beattracking': ['self->hop_size'], 'tempo': ['1'], 'peakpicker': ['1'], 'source': ['self->hop_size', '1'], } # default value for variables aubioinitvalue = { 'uint_t': 0, 'smpl_t': 0, 'lsmp_t': 0., 'char_t*': 'NULL', } aubiodefvalue = { # we have some clean up to do 'buf_size': 'Py_default_vector_length', # and here too 'hop_size': 'Py_default_vector_length / 2', # these should be alright 'samplerate': 'Py_aubio_default_samplerate', # now for the non obvious ones 'n_filters': '40', 'n_coeffs': '13', 'nelems': '10', 'flow': '0.', 'fhig': '1.', 'ilow': '0.', 'ihig': '1.', 'thrs': '0.5', 'ratio': '0.5', 'method': '"default"', 'uri': '"none"', } # aubio to python aubio2pytypes = { 'uint_t': 'I', 'smpl_t': 'f', 'lsmp_t': 'd', 'fvec_t*': 'O', 'cvec_t*': 'O', 'char_t*': 's', } # python to aubio aubiovecfrompyobj = { 'fvec_t*': 'PyAubio_ArrayToCFvec', 'cvec_t*': 'PyAubio_ArrayToCCvec', 'uint_t': '(uint_t)PyInt_AsLong', } # aubio to python aubiovectopyobj = { 'fvec_t*': 'PyAubio_CFvecToArray', 'cvec_t*': 'PyAubio_CCvecToPyCvec', 'smpl_t': 'PyFloat_FromDouble', 'uint_t*': 'PyInt_FromLong', 'uint_t': 'PyInt_FromLong', } def gen_new_init(newfunc, name): newparams = get_params_types_names(newfunc) # self->param1, self->param2, self->param3 if len(newparams): selfparams = ', self->'+', self->'.join([p['name'] for p in newparams]) else: selfparams = '' # "param1", "param2", "param3" paramnames = ", ".join(["\""+p['name']+"\"" for p in newparams]) pyparams = "".join(map(lambda p: aubio2pytypes[p['type']], newparams)) paramrefs = ", ".join(["&" + p['name'] for p in newparams]) s = """\ // WARNING: this file is generated, DO NOT EDIT // WARNING: if you haven't read the first line yet, please do so #include "aubiowraphell.h" typedef struct { PyObject_HEAD aubio_%(name)s_t * o; """ % locals() for p in newparams: ptype = p['type'] pname = p['name'] s += """\ %(ptype)s %(pname)s; """ % locals() s += """\ } Py_%(name)s; static char Py_%(name)s_doc[] = "%(name)s object"; static PyObject * Py_%(name)s_new (PyTypeObject * pytype, PyObject * args, PyObject * kwds) { Py_%(name)s *self; """ % locals() for p in newparams: ptype = p['type'] pname = p['name'] initval = aubioinitvalue[ptype] s += """\ %(ptype)s %(pname)s = %(initval)s; """ % locals() # now the actual PyArg_Parse if len(paramnames): s += """\ static char *kwlist[] = { %(paramnames)s, NULL }; if (!PyArg_ParseTupleAndKeywords (args, kwds, "|%(pyparams)s", kwlist, %(paramrefs)s)) { return NULL; } """ % locals() s += """\ self = (Py_%(name)s *) pytype->tp_alloc (pytype, 0); if (self == NULL) { return NULL; } """ % locals() for p in newparams: ptype = p['type'] pname = p['name'] defval = aubiodefvalue[pname] if ptype == 'char_t*': s += """\ self->%(pname)s = %(defval)s; if (%(pname)s != NULL) { self->%(pname)s = %(pname)s; } """ % locals() elif ptype == 'uint_t': s += """\ self->%(pname)s = %(defval)s; if (%(pname)s > 0) { self->%(pname)s = %(pname)s; } else if (%(pname)s < 0) { PyErr_SetString (PyExc_ValueError, "can not use negative value for %(pname)s"); return NULL; } """ % locals() elif ptype == 'smpl_t': s += """\ self->%(pname)s = %(defval)s; if (%(pname)s != %(defval)s) { self->%(pname)s = %(pname)s; } """ % locals() else: write_msg ("ERROR, unknown type of parameter %s %s" % (ptype, pname) ) s += """\ return (PyObject *) self; } AUBIO_INIT(%(name)s %(selfparams)s) AUBIO_DEL(%(name)s) """ % locals() return s def gen_do_input_params(inputparams): inputdefs = '' parseinput = '' inputrefs = '' inputvecs = '' pytypes = '' if len(inputparams): # build the parsing string for PyArg_ParseTuple pytypes = "".join([aubio2pytypes[p['type']] for p in inputparams]) inputdefs = " /* input vectors python prototypes */\n" for p in inputparams: if p['type'] != 'uint_t': inputdefs += " PyObject * " + p['name'] + "_obj;\n" inputvecs = " /* input vectors prototypes */\n " inputvecs += "\n ".join(map(lambda p: p['type'] + ' ' + p['name'] + ";", inputparams)) parseinput = " /* input vectors parsing */\n " for p in inputparams: inputvec = p['name'] if p['type'] != 'uint_t': inputdef = p['name'] + "_obj" else: inputdef = p['name'] converter = aubiovecfrompyobj[p['type']] if p['type'] != 'uint_t': parseinput += """%(inputvec)s = %(converter)s (%(inputdef)s); if (%(inputvec)s == NULL) { return NULL; } """ % locals() # build the string for the input objects references inputreflist = [] for p in inputparams: if p['type'] != 'uint_t': inputreflist += [ "&" + p['name'] + "_obj" ] else: inputreflist += [ "&" + p['name'] ] inputrefs = ", ".join(inputreflist) # end of inputs strings return inputdefs, parseinput, inputrefs, inputvecs, pytypes def gen_do_output_params(outputparams, name): outputvecs = "" outputcreate = "" if len(outputparams): outputvecs = " /* output vectors prototypes */\n" for p in outputparams: params = { 'name': p['name'], 'pytype': p['type'], 'autype': p['type'][:-3], 'length': defaultsizes[name].pop(0) } if (p['type'] == 'uint_t*'): outputvecs += ' uint_t' + ' ' + p['name'] + ";\n" outputcreate += " %(name)s = 0;\n" % params else: outputvecs += " " + p['type'] + ' ' + p['name'] + ";\n" outputcreate += " /* creating output %(name)s as a new_%(autype)s of length %(length)s */\n" % params outputcreate += " %(name)s = new_%(autype)s (%(length)s);\n" % params returnval = ""; if len(outputparams) > 1: returnval += " PyObject *outputs = PyList_New(0);\n" for p in outputparams: returnval += " PyList_Append( outputs, (PyObject *)" + aubiovectopyobj[p['type']] + " (" + p['name'] + ")" +");\n" returnval += " return outputs;" elif len(outputparams) == 1: if defaultsizes[name] == '1': returnval += " return (PyObject *)PyFloat_FromDouble(" + p['name'] + "->data[0])" else: returnval += " return (PyObject *)" + aubiovectopyobj[p['type']] + " (" + p['name'] + ")" else: returnval = " return Py_None;"; # end of output strings return outputvecs, outputcreate, returnval def gen_do(dofunc, name): funcname = dofunc.split()[1].split('(')[0] doparams = get_params_types_names(dofunc) # make sure the first parameter is the object assert doparams[0]['type'] == "aubio_"+name+"_t*", \ "method is not in 'aubio_<name>_t" # and remove it doparams = doparams[1:] n_param = len(doparams) if name in param_numbers.keys(): n_input_param, n_output_param = param_numbers[name] else: n_input_param, n_output_param = 1, n_param - 1 assert n_output_param + n_input_param == n_param, "n_output_param + n_input_param != n_param for %s" % name inputparams = doparams[:n_input_param] outputparams = doparams[n_input_param:n_input_param + n_output_param] inputdefs, parseinput, inputrefs, inputvecs, pytypes = gen_do_input_params(inputparams); outputvecs, outputcreate, returnval = gen_do_output_params(outputparams, name) # build strings for outputs # build the parameters for the _do() call doparams_string = "self->o" for p in doparams: if p['type'] == 'uint_t*': doparams_string += ", &" + p['name'] else: doparams_string += ", " + p['name'] if n_input_param: arg_parse_tuple = """\ if (!PyArg_ParseTuple (args, "%(pytypes)s", %(inputrefs)s)) { return NULL; } """ % locals() else: arg_parse_tuple = "" # put it all together s = """\ /* function Py_%(name)s_do */ static PyObject * Py_%(name)s_do(Py_%(name)s * self, PyObject * args) { %(inputdefs)s %(inputvecs)s %(outputvecs)s %(arg_parse_tuple)s %(parseinput)s %(outputcreate)s /* compute _do function */ %(funcname)s (%(doparams_string)s); %(returnval)s; } """ % locals() return s def gen_members(new_method, name): newparams = get_params_types_names(new_method) s = """ AUBIO_MEMBERS_START(%(name)s)""" % locals() for param in newparams: if param['type'] == 'char_t*': s += """ {"%(pname)s", T_STRING, offsetof (Py_%(name)s, %(pname)s), READONLY, ""},""" \ % { 'pname': param['name'], 'ptype': param['type'], 'name': name} elif param['type'] == 'uint_t': s += """ {"%(pname)s", T_INT, offsetof (Py_%(name)s, %(pname)s), READONLY, ""},""" \ % { 'pname': param['name'], 'ptype': param['type'], 'name': name} elif param['type'] == 'smpl_t': s += """ {"%(pname)s", T_FLOAT, offsetof (Py_%(name)s, %(pname)s), READONLY, ""},""" \ % { 'pname': param['name'], 'ptype': param['type'], 'name': name} else: write_msg ("-- ERROR, unknown member type ", param ) s += """ AUBIO_MEMBERS_STOP(%(name)s) """ % locals() return s def gen_methods(get_methods, set_methods, name): s = "" method_defs = "" for method in set_methods: method_name = get_name(method) params = get_params_types_names(method) out_type = get_return_type(method) assert params[0]['type'] == "aubio_"+name+"_t*", \ "get method is not in 'aubio_<name>_t" write_msg (method ) write_msg (params[1:]) setter_args = "self->o, " +",".join([p['name'] for p in params[1:]]) parse_args = "" for p in params[1:]: parse_args += p['type'] + " " + p['name'] + ";\n" argmap = "".join([aubio2pytypes[p['type']] for p in params[1:]]) arglist = ", ".join(["&"+p['name'] for p in params[1:]]) parse_args += """ if (!PyArg_ParseTuple (args, "%(argmap)s", %(arglist)s)) { return NULL; } """ % locals() s += """ static PyObject * Py%(funcname)s (Py_%(objname)s *self, PyObject *args) { uint_t err = 0; %(parse_args)s err = %(funcname)s (%(setter_args)s); if (err > 0) { PyErr_SetString (PyExc_ValueError, "error running %(funcname)s"); return NULL; } return Py_None; } """ % {'funcname': method_name, 'objname': name, 'out_type': out_type, 'setter_args': setter_args, 'parse_args': parse_args } shortname = method_name.split(name+'_')[-1] method_defs += """\ {"%(shortname)s", (PyCFunction) Py%(method_name)s, METH_VARARGS, ""}, """ % locals() for method in get_methods: method_name = get_name(method) params = get_params_types_names(method) out_type = get_return_type(method) assert params[0]['type'] == "aubio_"+name+"_t*", \ "get method is not in 'aubio_<name>_t %s" % params[0]['type'] assert len(params) == 1, \ "get method has more than one parameter %s" % params getter_args = "self->o" returnval = "(PyObject *)" + aubiovectopyobj[out_type] + " (tmp)" shortname = method_name.split(name+'_')[-1] method_defs += """\ {"%(shortname)s", (PyCFunction) Py%(method_name)s, METH_NOARGS, ""}, """ % locals() s += """ static PyObject * Py%(funcname)s (Py_%(objname)s *self, PyObject *unused) { %(out_type)s tmp = %(funcname)s (%(getter_args)s); return %(returnval)s; } """ % {'funcname': method_name, 'objname': name, 'out_type': out_type, 'getter_args': getter_args, 'returnval': returnval } s += """ static PyMethodDef Py_%(name)s_methods[] = { """ % locals() s += method_defs s += """\ {NULL} /* sentinel */ }; """ % locals() return s def gen_finish(name): s = """\ AUBIO_TYPEOBJECT(%(name)s, "aubio.%(name)s") """ % locals() return s