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#
# Copyright 2013 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
''' A parser for blocks written in C++ '''
import re
import sys
def dummy_translator(the_type, default_v=None):
""" Doesn't really translate. """
return the_type
class ParserCCBlock(object):
""" Class to read blocks written in C++ """
def __init__(self, filename_cc, filename_h, blockname, version, type_trans=dummy_translator):
self.code_cc = open(filename_cc).read()
self.code_h = open(filename_h).read()
self.blockname = blockname
self.type_trans = type_trans
self.version = version
def read_io_signature(self):
""" Scans a .cc file for an IO signature. """
def _figure_out_iotype_and_vlen(iosigcall, typestr):
""" From a type identifier, returns the data type.
E.g., for sizeof(int), it will return 'int'.
Returns a list! """
if 'gr_make_iosignaturev' in iosigcall:
print 'tbi'
raise ValueError
return {'type': [_typestr_to_iotype(x) for x in typestr.split(',')],
'vlen': [_typestr_to_vlen(x) for x in typestr.split(',')]
}
def _typestr_to_iotype(typestr):
""" Convert a type string (e.g. sizeof(int) * vlen) to the type (e.g. 'int'). """
type_match = re.search('sizeof\s*\(([^)]*)\)', typestr)
if type_match is None:
return self.type_trans('char')
return self.type_trans(type_match.group(1))
def _typestr_to_vlen(typestr):
""" From a type identifier, returns the vector length of the block's
input/out. E.g., for 'sizeof(int) * 10', it returns 10. For
'sizeof(int)', it returns '1'. For 'sizeof(int) * vlen', it returns
the string vlen. """
# Catch fringe case where no sizeof() is given
if typestr.find('sizeof') == -1:
return typestr
if typestr.find('*') == -1:
return '1'
vlen_parts = typestr.split('*')
for fac in vlen_parts:
if fac.find('sizeof') != -1:
vlen_parts.remove(fac)
if len(vlen_parts) == 1:
return vlen_parts[0].strip()
elif len(vlen_parts) > 1:
return '*'.join(vlen_parts).strip()
iosig = {}
iosig_regex = '(?P<incall>gr_make_io_signature[23v]?)\s*\(\s*(?P<inmin>[^,]+),\s*(?P<inmax>[^,]+),' + \
'\s*(?P<intype>(\([^\)]*\)|[^)])+)\),\s*' + \
'(?P<outcall>gr_make_io_signature[23v]?)\s*\(\s*(?P<outmin>[^,]+),\s*(?P<outmax>[^,]+),' + \
'\s*(?P<outtype>(\([^\)]*\)|[^)])+)\)'
iosig_match = re.compile(iosig_regex, re.MULTILINE).search(self.code_cc)
try:
iosig['in'] = _figure_out_iotype_and_vlen(iosig_match.group('incall'),
iosig_match.group('intype'))
iosig['in']['min_ports'] = iosig_match.group('inmin')
iosig['in']['max_ports'] = iosig_match.group('inmax')
except ValueError, Exception:
print "Error: Can't parse input signature."
try:
iosig['out'] = _figure_out_iotype_and_vlen(iosig_match.group('outcall'),
iosig_match.group('outtype'))
iosig['out']['min_ports'] = iosig_match.group('outmin')
iosig['out']['max_ports'] = iosig_match.group('outmax')
except ValueError, Exception:
print "Error: Can't parse output signature."
return iosig
def read_params(self):
""" Read the parameters required to initialize the block """
def _scan_param_list(start_idx):
""" Go through a parameter list and return a tuple each:
(type, name, default_value). Python's re just doesn't cut
it for C++ code :( """
i = start_idx
c = self.code_h
if c[i] != '(':
raise ValueError
i += 1
param_list = []
read_state = 'type'
in_string = False
parens_count = 0 # Counts ()
brackets_count = 0 # Counts <>
end_of_list = False
this_type = ''
this_name = ''
this_defv = ''
WHITESPACE = ' \t\n\r\f\v'
while not end_of_list:
# Keep track of (), stop when reaching final closing parens
if not in_string:
if c[i] == ')':
if parens_count == 0:
if read_state == 'type':
raise ValueError(
'Found closing parentheses before finishing last argument (this is how far I got: %s)'
% str(param_list)
)
param_list.append((this_type, this_name, this_defv))
end_of_list = True
break
else:
parens_count -= 1
elif c[i] == '(':
parens_count += 1
# Parameter type (int, const std::string, std::vector<gr_complex>, unsigned long ...)
if read_state == 'type':
if c[i] == '<':
brackets_count += 1
if c[i] == '>':
brackets_count -= 1
if c[i] == '&':
i += 1
continue
if c[i] in WHITESPACE and brackets_count == 0:
while c[i] in WHITESPACE:
i += 1
continue
if this_type == 'const' or this_type == '': # Ignore this
this_type = ''
elif this_type == 'unsigned': # Continue
this_type += ' '
continue
else:
read_state = 'name'
continue
this_type += c[i]
i += 1
continue
# Parameter name
if read_state == 'name':
if c[i] == '&' or c[i] in WHITESPACE:
i += 1
elif c[i] == '=':
if parens_count != 0:
raise ValueError(
'While parsing argument %d (%s): name finished but no closing parentheses.'
% (len(param_list)+1, this_type + ' ' + this_name)
)
read_state = 'defv'
i += 1
elif c[i] == ',':
if parens_count:
raise ValueError(
'While parsing argument %d (%s): name finished but no closing parentheses.'
% (len(param_list)+1, this_type + ' ' + this_name)
)
read_state = 'defv'
else:
this_name += c[i]
i += 1
continue
# Default value
if read_state == 'defv':
if in_string:
if c[i] == '"' and c[i-1] != '\\':
in_string = False
else:
this_defv += c[i]
elif c[i] == ',':
if parens_count:
raise ValueError(
'While parsing argument %d (%s): default value finished but no closing parentheses.'
% (len(param_list)+1, this_type + ' ' + this_name)
)
read_state = 'type'
param_list.append((this_type, this_name, this_defv))
this_type = ''
this_name = ''
this_defv = ''
else:
this_defv += c[i]
i += 1
continue
return param_list
# Go, go, go!
if self.version == '37':
make_regex = 'static\s+sptr\s+make\s*'
else:
make_regex = '(?<=_API)\s+\w+_sptr\s+\w+_make_\w+\s*'
make_match = re.compile(make_regex, re.MULTILINE).search(self.code_h)
try:
params_list = _scan_param_list(make_match.end(0))
except ValueError as ve:
print "Can't parse the argument list: ", ve.args[0]
sys.exit(0)
params = []
for plist in params_list:
params.append({'type': self.type_trans(plist[0], plist[2]),
'key': plist[1],
'default': plist[2],
'in_constructor': True})
return params
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