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"""Provide access to Python's configuration information. The specific names
defined in the module depend heavily on the platform and configuration.
Written by: Fred L. Drake, Jr.
Email: <fdrake@acm.org>
Initial date: 17-Dec-1998
"""
__version__ = "$Revision$"
import os
import re
import string
import sys
def get_config_h_filename():
"""Return full pathname of installed config.h file."""
return os.path.join(sys.exec_prefix, "lib", "python" + sys.version[:3],
"config", "config.h")
def get_makefile_filename():
"""Return full pathname of installed Makefile from the Python build."""
return os.path.join(sys.exec_prefix, "lib", "python" + sys.version[:3],
"config", "Makefile")
def parse_config_h(fp, g=None):
"""Parse a config.h-style file. A dictionary containing name/value
pairs is returned. If an optional dictionary is passed in as the second
argument, it is used instead of a new dictionary.
"""
if g is None:
g = {}
define_rx = re.compile("#define ([A-Z][A-Z0-9_]+) (.*)\n")
undef_rx = re.compile("/[*] #undef ([A-Z][A-Z0-9_]+) [*]/\n")
#
while 1:
line = fp.readline()
if not line:
break
m = define_rx.match(line)
if m:
n, v = m.group(1, 2)
try: v = string.atoi(v)
except ValueError: pass
g[n] = v
else:
m = undef_rx.match(line)
if m:
g[m.group(1)] = 0
return g
def parse_makefile(fp, g=None):
"""Parse a Makefile-style file. A dictionary containing name/value
pairs is returned. If an optional dictionary is passed in as the second
argument, it is used instead of a new dictionary.
"""
if g is None:
g = {}
variable_rx = re.compile("([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)\n")
done = {}
notdone = {}
#
while 1:
line = fp.readline()
if not line:
break
m = variable_rx.match(line)
if m:
n, v = m.group(1, 2)
v = string.strip(v)
if "$" in v:
notdone[n] = v
else:
try: v = string.atoi(v)
except ValueError: pass
done[n] = v
# do variable interpolation here
findvar1_rx = re.compile(r"\$\(([A-Za-z][A-Za-z0-9_]*)\)")
findvar2_rx = re.compile(r"\${([A-Za-z][A-Za-z0-9_]*)}")
while notdone:
for name in notdone.keys():
value = notdone[name]
m = findvar1_rx.search(value)
if not m:
m = findvar2_rx.search(value)
if m:
n = m.group(1)
if done.has_key(n):
after = value[m.end():]
value = value[:m.start()] + done[n] + after
if "$" in after:
notdone[name] = value
else:
try: value = string.atoi(value)
except ValueError: pass
done[name] = string.strip(value)
del notdone[name]
elif notdone.has_key(n):
# get it on a subsequent round
pass
else:
done[n] = ""
after = value[m.end():]
value = value[:m.start()] + after
if "$" in after:
notdone[name] = value
else:
try: value = string.atoi(value)
except ValueError: pass
done[name] = string.strip(value)
del notdone[name]
else:
# bogus variable reference; just drop it since we can't deal
del notdone[name]
# save the results in the global dictionary
g.update(done)
return g
def _init_posix():
"""Initialize the module as appropriate for POSIX systems."""
g = globals()
# load the installed config.h:
parse_config_h(open(get_config_h_filename()), g)
# load the installed Makefile.pre.in:
parse_makefile(open(get_makefile_filename()), g)
try:
exec "_init_" + os.name
except NameError:
# not needed for this platform
pass
else:
exec "_init_%s()" % os.name
del _init_posix
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