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