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import re
from c_analyzer_common.info import UNKNOWN
from .info import Variable
from .preprocessor import _iter_clean_lines
_NOT_SET = object()
def get_srclines(filename, *,
cache=None,
_open=open,
_iter_lines=_iter_clean_lines,
):
"""Return the file's lines as a list.
Each line will have trailing whitespace removed (including newline).
If a cache is given the it is used.
"""
if cache is not None:
try:
return cache[filename]
except KeyError:
pass
with _open(filename) as srcfile:
srclines = [line
for _, line in _iter_lines(srcfile)
if not line.startswith('#')]
for i, line in enumerate(srclines):
srclines[i] = line.rstrip()
if cache is not None:
cache[filename] = srclines
return srclines
def parse_variable_declaration(srcline):
"""Return (name, decl) for the given declaration line."""
# XXX possible false negatives...
decl, sep, _ = srcline.partition('=')
if not sep:
if not srcline.endswith(';'):
return None, None
decl = decl.strip(';')
decl = decl.strip()
m = re.match(r'.*\b(\w+)\s*(?:\[[^\]]*\])?$', decl)
if not m:
return None, None
name = m.group(1)
return name, decl
def parse_variable(srcline, funcname=None):
"""Return a Variable for the variable declared on the line (or None)."""
line = srcline.strip()
# XXX Handle more than just static variables.
if line.startswith('static '):
if '(' in line and '[' not in line:
# a function
return None, None
return parse_variable_declaration(line)
else:
return None, None
def iter_variables(filename, *,
srccache=None,
parse_variable=None,
_get_srclines=get_srclines,
_default_parse_variable=parse_variable,
):
"""Yield a Variable for each in the given source file."""
if parse_variable is None:
parse_variable = _default_parse_variable
indent = ''
prev = ''
funcname = None
for line in _get_srclines(filename, cache=srccache):
# remember current funcname
if funcname:
if line == indent + '}':
funcname = None
continue
else:
if '(' in prev and line == indent + '{':
if not prev.startswith('__attribute__'):
funcname = prev.split('(')[0].split()[-1]
prev = ''
continue
indent = line[:-len(line.lstrip())]
prev = line
info = parse_variable(line, funcname)
if isinstance(info, list):
for name, _funcname, decl in info:
yield Variable.from_parts(filename, _funcname, name, decl)
continue
name, decl = info
if name is None:
continue
yield Variable.from_parts(filename, funcname, name, decl)
def _match_varid(variable, name, funcname, ignored=None):
if ignored and variable in ignored:
return False
if variable.name != name:
return False
if funcname == UNKNOWN:
if not variable.funcname:
return False
elif variable.funcname != funcname:
return False
return True
def find_variable(filename, funcname, name, *,
ignored=None,
srccache=None, # {filename: lines}
parse_variable=None,
_iter_variables=iter_variables,
):
"""Return the matching variable.
Return None if the variable is not found.
"""
for variable in _iter_variables(filename,
srccache=srccache,
parse_variable=parse_variable,
):
if _match_varid(variable, name, funcname, ignored):
return variable
else:
return None
def find_variables(varids, filenames=None, *,
srccache=_NOT_SET,
parse_variable=None,
_find_symbol=find_variable,
):
"""Yield a Variable for each ID.
If the variable is not found then its decl will be UNKNOWN. That
way there will be one resulting Variable per given ID.
"""
if srccache is _NOT_SET:
srccache = {}
used = set()
for varid in varids:
if varid.filename and varid.filename != UNKNOWN:
srcfiles = [varid.filename]
else:
if not filenames:
yield Variable(varid, UNKNOWN)
continue
srcfiles = filenames
for filename in srcfiles:
found = _find_varid(filename, varid.funcname, varid.name,
ignored=used,
srccache=srccache,
parse_variable=parse_variable,
)
if found:
yield found
used.add(found)
break
else:
yield Variable(varid, UNKNOWN)
|
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