"""Provide access to Python's configuration information.  The specific

configuration variables available depend heavily on the platform and

configuration.  The values may be retrieved using

get_config_var(name), and the list of variables is available via

get_config_vars().keys().  Additional convenience functions are also

available.

Written by:   Fred L. Drake, Jr.

Email:        <fdrake@acm.org>

"""

__revision__ = "$Id: sysconfig.py 52234 2006-10-08 17:50:26Z ronald.oussoren $"

import os

import re

import string

import sys

from distutils.errors import DistutilsPlatformError

# These are needed in a couple of spots, so just compute them once.

PREFIX = os.path.normpath(sys.prefix)

EXEC_PREFIX = os.path.normpath(sys.exec_prefix)

# python_build: (Boolean) if true, we're either building Python or

# building an extension with an un-installed Python, so we use

# different (hard-wired) directories.

argv0_path = os.path.dirname(os.path.abspath(sys.executable))

landmark = os.path.join(argv0_path, "Modules", "Setup")

python_build = os.path.isfile(landmark)

del landmark

def get_python_version():

    """Return a string containing the major and minor Python version,

    leaving off the patchlevel.  Sample return values could be '1.5'

    or '2.2'.

    """

    return sys.version[:3]

def get_python_inc(plat_specific=0, prefix=None):

    """Return the directory containing installed Python header files.

    If 'plat_specific' is false (the default), this is the path to the

    non-platform-specific header files, i.e. Python.h and so on;

    otherwise, this is the path to platform-specific header files

    (namely pyconfig.h).

    If 'prefix' is supplied, use it instead of sys.prefix or

    sys.exec_prefix -- i.e., ignore 'plat_specific'.

    """

    if prefix is None:

        prefix = plat_specific and EXEC_PREFIX or PREFIX

    if os.name == "posix":

        if python_build:

            base = os.path.dirname(os.path.abspath(sys.executable))

            if plat_specific:

                inc_dir = base

            else:

                inc_dir = os.path.join(base, "Include")

                if not os.path.exists(inc_dir):

                    inc_dir = os.path.join(os.path.dirname(base), "Include")

            return inc_dir

        return os.path.join(prefix, "include", "python" + get_python_version())

    elif os.name == "nt":

        return os.path.join(prefix, "include")

    elif os.name == "mac":

        if plat_specific:

            return os.path.join(prefix, "Mac", "Include")

        else:

            return os.path.join(prefix, "Include")

    elif os.name == "os2":

        return os.path.join(prefix, "Include")

    else:

        raise DistutilsPlatformError(

            "I don't know where Python installs its C header files "

            "on platform '%s'" % os.name)

def get_python_lib(plat_specific=0, standard_lib=0, prefix=None):

    """Return the directory containing the Python library (standard or

    site additions).

    If 'plat_specific' is true, return the directory containing

    platform-specific modules, i.e. any module from a non-pure-Python

    module distribution; otherwise, return the platform-shared library

    directory.  If 'standard_lib' is true, return the directory

    containing standard Python library modules; otherwise, return the

    directory for site-specific modules.

    If 'prefix' is supplied, use it instead of sys.prefix or

    sys.exec_prefix -- i.e., ignore 'plat_specific'.

    """

    if prefix is None:

        prefix = plat_specific and EXEC_PREFIX or PREFIX

    if os.name == "posix":

        libpython = os.path.join(prefix,

                                 "lib", "python" + get_python_version())

        if standard_lib:

            return libpython

        else:

            return os.path.join(libpython, "site-packages")

    elif os.name == "nt":

        if standard_lib:

            return os.path.join(prefix, "Lib")

        else:

            if get_python_version() < "2.2":

                return prefix

            else:

                return os.path.join(PREFIX, "Lib", "site-packages")

    elif os.name == "mac":

        if plat_specific:

            if standard_lib:

                return os.path.join(prefix, "Lib", "lib-dynload")

            else:

                return os.path.join(prefix, "Lib", "site-packages")

        else:

            if standard_lib:

                return os.path.join(prefix, "Lib")

            else:

                return os.path.join(prefix, "Lib", "site-packages")

    elif os.name == "os2":

        if standard_lib:

            return os.path.join(PREFIX, "Lib")

        else:

            return os.path.join(PREFIX, "Lib", "site-packages")

    else:

        raise DistutilsPlatformError(

            "I don't know where Python installs its library "

            "on platform '%s'" % os.name)

def customize_compiler(compiler):

    """Do any platform-specific customization of a CCompiler instance.

    Mainly needed on Unix, so we can plug in the information that

    varies across Unices and is stored in Python's Makefile.

    """

    if compiler.compiler_type == "unix":

        (cc, cxx, opt, cflags, ccshared, ldshared, so_ext) = \

            get_config_vars('CC', 'CXX', 'OPT', 'CFLAGS',

                            'CCSHARED', 'LDSHARED', 'SO')

        if os.environ.has_key('CC'):

            cc = os.environ['CC']

        if os.environ.has_key('CXX'):

            cxx = os.environ['CXX']

        if os.environ.has_key('LDSHARED'):

            ldshared = os.environ['LDSHARED']

        if os.environ.has_key('CPP'):

            cpp = os.environ['CPP']

        else:

            cpp = cc + " -E"           # not always

        if os.environ.has_key('LDFLAGS'):

            ldshared = ldshared + ' ' + os.environ['LDFLAGS']

        if os.environ.has_key('CFLAGS'):

            cflags = opt + ' ' + os.environ['CFLAGS']

            ldshared = ldshared + ' ' + os.environ['CFLAGS']

        if os.environ.has_key('CPPFLAGS'):

            cpp = cpp + ' ' + os.environ['CPPFLAGS']

            cflags = cflags + ' ' + os.environ['CPPFLAGS']

            ldshared = ldshared + ' ' + os.environ['CPPFLAGS']

        cc_cmd = cc + ' ' + cflags

        compiler.set_executables(

            preprocessor=cpp,

            compiler=cc_cmd,

            compiler_so=cc_cmd + ' ' + ccshared,

            compiler_cxx=cxx,

            linker_so=ldshared,

            linker_exe=cc)

        compiler.shared_lib_extension = so_ext

def get_config_h_filename():

    """Return full pathname of installed pyconfig.h file."""

    if python_build:

        inc_dir = argv0_path

    else:

        inc_dir = get_python_inc(plat_specific=1)

    if get_python_version() < '2.2':

        config_h = 'config.h'

    else:

        # The name of the config.h file changed in 2.2

        config_h = 'pyconfig.h'

    return os.path.join(inc_dir, config_h)

def get_makefile_filename():

    """Return full pathname of installed Makefile from the Python build."""

    if python_build:

        return os.path.join(os.path.dirname(sys.executable), "Makefile")

    lib_dir = get_python_lib(plat_specific=1, standard_lib=1)

    return os.path.join(lib_dir, "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-Za-z0-9_]+) (.*)\n")

    undef_rx = re.compile("/[*] #undef ([A-Z][A-Za-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 = int(v)

            except ValueError: pass

            g[n] = v

        else:

            m = undef_rx.match(line)

            if m:

                g[m.group(1)] = 0

    return g

# Regexes needed for parsing Makefile (and similar syntaxes,

# like old-style Setup files).

_variable_rx = re.compile("([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)")

_findvar1_rx = re.compile(r"\$\(([A-Za-z][A-Za-z0-9_]*)\)")

_findvar2_rx = re.compile(r"\${([A-Za-z][A-Za-z0-9_]*)}")

def parse_makefile(fn, 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.

    """

    from distutils.text_file import TextFile

    fp = TextFile(fn, strip_comments=1, skip_blanks=1, join_lines=1)

    if g is None:

        g = {}

    done = {}

    notdone = {}

    while 1:

        line = fp.readline()

        if line is None:                # eof

            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 = int(v)

                except ValueError: pass

                done[n] = v

    # do variable interpolation here

    while notdone:

        for name in notdone.keys():

            value = notdone[name]

            m = _findvar1_rx.search(value) or _findvar2_rx.search(value)

            if m:

                n = m.group(1)

                found = True

                if done.has_key(n):

                    item = str(done[n])

                elif notdone.has_key(n):

                    # get it on a subsequent round

                    found = False

                elif os.environ.has_key(n):

                    # do it like make: fall back to environment

                    item = os.environ[n]

                else:

                    done[n] = item = ""

                if found:

                    after = value[m.end():]

                    value = value[:m.start()] + item + after

                    if "$" in after:

                        notdone[name] = value

                    else:

                        try: value = int(value)

                        except ValueError:

                            done[name] = string.strip(value)

                        else:

                            done[name] = value

                        del notdone[name]

            else:

                # bogus variable reference; just drop it since we can't deal

                del notdone[name]

    fp.close()

    # save the results in the global dictionary

    g.update(done)

    return g

def expand_makefile_vars(s, vars):

    """Expand Makefile-style variables -- "${foo}" or "$(foo)" -- in

    'string' according to 'vars' (a dictionary mapping variable names to

    values).  Variables not present in 'vars' are silently expanded to the

    empty string.  The variable values in 'vars' should not contain further

    variable expansions; if 'vars' is the output of 'parse_makefile()',

    you're fine.  Returns a variable-expanded version of 's'.

    """

    # This algorithm does multiple expansion, so if vars['foo'] contains

    # "${bar}", it will expand ${foo} to ${bar}, and then expand

    # ${bar}... and so forth.  This is fine as long as 'vars' comes from

    # 'parse_makefile()', which takes care of such expansions eagerly,

    # according to make's variable expansion semantics.

    while 1:

        m = _findvar1_rx.search(s) or _findvar2_rx.search(s)

        if m:

            (beg, end) = m.span()

            s = s[0:beg] + vars.get(m.group(1)) + s[end:]

        else:

            break

    return s

_config_vars = None

def _init_posix():

    """Initialize the module as appropriate for POSIX systems."""

    g = {}

    # load the installed Makefile:

    try:

        filename = get_makefile_filename()

        parse_makefile(filename, g)

    except IOError, msg:

        my_msg = "invalid Python installation: unable to open %s" % filename

        if hasattr(msg, "strerror"):

            my_msg = my_msg + " (%s)" % msg.strerror

        raise DistutilsPlatformError(my_msg)

    # load the installed pyconfig.h:

    try:

        filename = get_config_h_filename()

        parse_config_h(file(filename), g)

    except IOError, msg:

        my_msg = "invalid Python installation: unable to open %s" % filename

        if hasattr(msg, "strerror"):

            my_msg = my_msg + " (%s)" % msg.strerror

        raise DistutilsPlatformError(my_msg)

    # On MacOSX we need to check the setting of the environment variable

    # MACOSX_DEPLOYMENT_TARGET: configure bases some choices on it so

    # it needs to be compatible.

    # If it isn't set we set it to the configure-time value

    if sys.platform == 'darwin' and g.has_key('MACOSX_DEPLOYMENT_TARGET'):

        cfg_target = g['MACOSX_DEPLOYMENT_TARGET']

        cur_target = os.getenv('MACOSX_DEPLOYMENT_TARGET', '')

        if cur_target == '':

            cur_target = cfg_target

            os.putenv('MACOSX_DEPLOYMENT_TARGET', cfg_target)

        elif map(int, cfg_target.split('.')) > map(int, cur_target.split('.')):

            my_msg = ('$MACOSX_DEPLOYMENT_TARGET mismatch: now "%s" but "%s" during configure'

                % (cur_target, cfg_target))

            raise DistutilsPlatformError(my_msg)

    # On AIX, there are wrong paths to the linker scripts in the Makefile

    # -- these paths are relative to the Python source, but when installed

    # the scripts are in another directory.

    if python_build:

        g['LDSHARED'] = g['BLDSHARED']

    elif get_python_version() < '2.1':

        # The following two branches are for 1.5.2 compatibility.

        if sys.platform == 'aix4':          # what about AIX 3.x ?

            # Linker script is in the config directory, not in Modules as the

            # Makefile says.

            python_lib = get_python_lib(standard_lib=1)

            ld_so_aix = os.path.join(python_lib, 'config', 'ld_so_aix')

            python_exp = os.path.join(python_lib, 'config', 'python.exp')

            g['LDSHARED'] = "%s %s -bI:%s" % (ld_so_aix, g['CC'], python_exp)

        elif sys.platform == 'beos':

            # Linker script is in the config directory.  In the Makefile it is

            # relative to the srcdir, which after installation no longer makes

            # sense.

            python_lib = get_python_lib(standard_lib=1)

            linkerscript_path = string.split(g['LDSHARED'])[0]

            linkerscript_name = os.path.basename(linkerscript_path)

            linkerscript = os.path.join(python_lib, 'config',

                                        linkerscript_name)

            # XXX this isn't the right place to do this: adding the Python

            # library to the link, if needed, should be in the "build_ext"

            # command.  (It's also needed for non-MS compilers on Windows, and

            # it's taken care of for them by the 'build_ext.get_libraries()'

            # method.)

            g['LDSHARED'] = ("%s -L%s/lib -lpython%s" %

                             (linkerscript, PREFIX, get_python_version()))

    global _config_vars

    _config_vars = g

def _init_nt():

    """Initialize the module as appropriate for NT"""

    g = {}

    # set basic install directories

    g['LIBDEST'] = get_python_lib(plat_specific=0, standard_lib=1)

    g['BINLIBDEST'] = get_python_lib(plat_specific=1, standard_lib=1)

    # XXX hmmm.. a normal install puts include files here

    g['INCLUDEPY'] = get_python_inc(plat_specific=0)

    g['SO'] = '.pyd'

    g['EXE'] = ".exe"

    global _config_vars

    _config_vars = g

def _init_mac():

    """Initialize the module as appropriate for Macintosh systems"""

    g = {}

    # set basic install directories

    g['LIBDEST'] = get_python_lib(plat_specific=0, standard_lib=1)

    g['BINLIBDEST'] = get_python_lib(plat_specific=1, standard_lib=1)

    # XXX hmmm.. a normal install puts include files here

    g['INCLUDEPY'] = get_python_inc(plat_specific=0)

    import MacOS

    if not hasattr(MacOS, 'runtimemodel'):

        g['SO'] = '.ppc.slb'

    else:

        g['SO'] = '.%s.slb' % MacOS.runtimemodel

    # XXX are these used anywhere?

    g['install_lib'] = os.path.join(EXEC_PREFIX, "Lib")

    g['install_platlib'] = os.path.join(EXEC_PREFIX, "Mac", "Lib")

    # These are used by the extension module build

    g['srcdir'] = ':'

    global _config_vars

    _config_vars = g

def _init_os2():

    """Initialize the module as appropriate for OS/2"""

    g = {}

    # set basic install directories

    g['LIBDEST'] = get_python_lib(plat_specific=0, standard_lib=1)

    g['BINLIBDEST'] = get_python_lib(plat_specific=1, standard_lib=1)

    # XXX hmmm.. a normal install puts include files here

    g['INCLUDEPY'] = get_python_inc(plat_specific=0)

    g['SO'] = '.pyd'

    g['EXE'] = ".exe"

    global _config_vars

    _config_vars = g

def get_config_vars(*args):

    """With no arguments, return a dictionary of all configuration

    variables relevant for the current platform.  Generally this includes

    everything needed to build extensions and install both pure modules and

    extensions.  On Unix, this means every variable defined in Python's

    installed Makefile; on Windows and Mac OS it's a much smaller set.

    With arguments, return a list of values that result from looking up

    each argument in the configuration variable dictionary.

    """

    global _config_vars

    if _config_vars is None:

        func = globals().get("_init_" + os.name)

        if func:

            func()

        else:

            _config_vars = {}

        # Normalized versions of prefix and exec_prefix are handy to have;

        # in fact, these are the standard versions used most places in the

        # Distutils.

        _config_vars['prefix'] = PREFIX

        _config_vars['exec_prefix'] = EXEC_PREFIX

        if sys.platform == 'darwin':

            kernel_version = os.uname()[2] # Kernel version (8.4.3)

            major_version = int(kernel_version.split('.')[0])

            if major_version < 8:

                # On Mac OS X before 10.4, check if -arch and -isysroot

                # are in CFLAGS or LDFLAGS and remove them if they are.

                # This is needed when building extensions on a 10.3 system

                # using a universal build of python.

                for key in ('LDFLAGS', 'BASECFLAGS',

                        # a number of derived variables. These need to be

                        # patched up as well.

                        'CFLAGS', 'PY_CFLAGS', 'BLDSHARED'):

                    flags = _config_vars[key]

                    flags = re.sub('-arch\s+\w+\s', ' ', flags)

                    flags = re.sub('-isysroot [^ \t]*', ' ', flags)

                    _config_vars[key] = flags

    if args:

        vals = []

        for name in args:

            vals.append(_config_vars.get(name))

        return vals

    else:

        return _config_vars