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#-----------------------------------------------------------------
# pycparser: __init__.py
#
# This package file exports some convenience functions for
# interacting with pycparser
#
# Eli Bendersky [https://eli.thegreenplace.net/]
# License: BSD
#-----------------------------------------------------------------
__all__ = ['c_lexer', 'c_parser', 'c_ast']
__version__ = '2.21'
import io
from subprocess import check_output
from .c_parser import CParser
def preprocess_file(filename, cpp_path='cpp', cpp_args=''):
""" Preprocess a file using cpp.
filename:
Name of the file you want to preprocess.
cpp_path:
cpp_args:
Refer to the documentation of parse_file for the meaning of these
arguments.
When successful, returns the preprocessed file's contents.
Errors from cpp will be printed out.
"""
path_list = [cpp_path]
if isinstance(cpp_args, list):
path_list += cpp_args
elif cpp_args != '':
path_list += [cpp_args]
path_list += [filename]
try:
# Note the use of universal_newlines to treat all newlines
# as \n for Python's purpose
text = check_output(path_list, universal_newlines=True)
except OSError as e:
raise RuntimeError("Unable to invoke 'cpp'. " +
'Make sure its path was passed correctly\n' +
('Original error: %s' % e))
return text
def parse_file(filename, use_cpp=False, cpp_path='cpp', cpp_args='',
parser=None):
""" Parse a C file using pycparser.
filename:
Name of the file you want to parse.
use_cpp:
Set to True if you want to execute the C pre-processor
on the file prior to parsing it.
cpp_path:
If use_cpp is True, this is the path to 'cpp' on your
system. If no path is provided, it attempts to just
execute 'cpp', so it must be in your PATH.
cpp_args:
If use_cpp is True, set this to the command line arguments strings
to cpp. Be careful with quotes - it's best to pass a raw string
(r'') here. For example:
r'-I../utils/fake_libc_include'
If several arguments are required, pass a list of strings.
parser:
Optional parser object to be used instead of the default CParser
When successful, an AST is returned. ParseError can be
thrown if the file doesn't parse successfully.
Errors from cpp will be printed out.
"""
if use_cpp:
text = preprocess_file(filename, cpp_path, cpp_args)
else:
with io.open(filename) as f:
text = f.read()
if parser is None:
parser = CParser()
return parser.parse(text, filename)