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Build # 78

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Pull #34

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<a href="https://github.com/yuce/pyswip/commit/<a class=hub.com/yuce/pyswip/commit/96e2a7c8553c34d1cac756a905424f6c180ba69d">96e2a7c85<a href="https://github.com/yuce/pyswip/commit/96e2a7c8553c34d1cac756a905424f6c180ba69d">">Merge </a><a class="double-link" href="https://github.com/yuce/pyswip/commit/<a class="double-link" href="https://github.com/yuce/pyswip/commit/ee0dde0494d67a1e7b5d1f204b311e08f20e5983">ee0dde049</a>">ee0dde049</a><a href="https://github.com/yuce/pyswip/commit/96e2a7c8553c34d1cac756a905424f6c180ba69d"> into e017f5d7b">e017f5d7b</a>

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/pyswip/discover.py

# -*- coding: utf-8 -*-


# pyswip -- Python SWI-Prolog bridge
# Copyright (c) 2007-2018 Yüce Tekol
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

from __future__ import print_function
import sys
import os
import glob
from subprocess import Popen, PIPE
from ctypes.util import find_library


# To initialize the SWI-Prolog environment, two things need to be done: the
# first is to find where the SO/DLL is located and the second is to find the
# SWI-Prolog home, to get the saved state.
#
# The goal of the (entangled) process below is to make the library installation
# independent.


def _findSwiplPathFromFindLib():
    """
    This function resorts to ctype's find_library to find the path to the
    DLL. The biggest problem is that find_library does not give the path to the
    resource file.

    :returns:
        A path to the swipl SO/DLL or None if it is not found.

    :returns type:
        {str, None}
    """

    path = (find_library('swipl') or
            find_library('pl') or
            find_library('libswipl'))  # This last one is for Windows
    return path


def _findSwiplFromExec():
    """
    This function tries to use an executable on the path to find SWI-Prolog
    SO/DLL and the resource file.

    :returns:
        A tuple of (path to the swipl DLL, path to the resource file)

    :returns type:
        ({str, None}, {str, None})
    """

    platform = sys.platform[:3]

    fullName = None
    swiHome = None

    try:  # try to get library path from swipl executable.

        # We may have pl or swipl as the executable
        try:
            cmd = Popen(['swipl', '-dump-runtime-variables'], stdout=PIPE)
        except OSError:
            cmd = Popen(['pl', '-dump-runtime-variables'], stdout=PIPE)
        ret = cmd.communicate()

        # Parse the output into a dictionary
        ret = ret[0].decode().replace(';', '').splitlines()
        ret = [line.split('=', 1) for line in ret]
        rtvars = dict((name, value[1:-1]) for name, value in ret)  # [1:-1] gets
        # rid of the
        # quotes

        if rtvars['PLSHARED'] == 'no':
            raise ImportError('SWI-Prolog is not installed as a shared '
                              'library.')
        else:  # PLSHARED == 'yes'
            swiHome = rtvars['PLBASE']  # The environment is in PLBASE
            if not os.path.exists(swiHome):
                swiHome = None

            # determine platform specific path
            if platform == "win":
                dllName = rtvars['PLLIB'][:-4] + '.' + rtvars['PLSOEXT']
                path = os.path.join(rtvars['PLBASE'], 'bin')
                fullName = os.path.join(path, dllName)

                if not os.path.exists(fullName):
                    fullName = None

            elif platform == "cyg":
                # e.g. /usr/lib/pl-5.6.36/bin/i686-cygwin/cygpl.dll

                dllName = 'cygpl.dll'
                path = os.path.join(rtvars['PLBASE'], 'bin', rtvars['PLARCH'])
                fullName = os.path.join(path, dllName)

                if not os.path.exists(fullName):
                    fullName = None

            elif platform == "dar":
                dllName = 'lib' + rtvars['PLLIB'][2:] + '.' + rtvars['PLSOEXT']
                path = os.path.join(rtvars['PLBASE'], 'lib', rtvars['PLARCH'])
                baseName = os.path.join(path, dllName)

                if os.path.exists(baseName):
                    fullName = baseName
                else:  # We will search for versions
                    fullName = None

            else:  # assume UNIX-like
                # The SO name in some linuxes is of the form libswipl.so.5.10.2,
                # so we have to use glob to find the correct one
                dllName = 'lib' + rtvars['PLLIB'][2:] + '.' + rtvars['PLSOEXT']
                path = os.path.join(rtvars['PLBASE'], 'lib', rtvars['PLARCH'])
                baseName = os.path.join(path, dllName)

                if os.path.exists(baseName):
                    fullName = baseName
                else:  # We will search for versions
                    pattern = baseName + '.*'
                    files = glob.glob(pattern)
                    if len(files) == 0:
                        fullName = None
                    elif len(files) == 1:
                        fullName = files[0]
                    else:  # Will this ever happen?
                        fullName = None

    except (OSError, KeyError):  # KeyError from accessing rtvars
        pass

    return (fullName, swiHome)


def _findSwiplWin():
    import re

    """
    This function uses several heuristics to gues where SWI-Prolog is installed
    in Windows. It always returns None as the path of the resource file because,
    in Windows, the way to find it is more robust so the SWI-Prolog DLL is
    always able to find it.

    :returns:
        A tuple of (path to the swipl DLL, path to the resource file)

    :returns type:
        ({str, None}, {str, None})
    """

    dllNames = ('swipl.dll', 'libswipl.dll')

    # First try: check the usual installation path (this is faster but
    # hardcoded)
    programFiles = os.getenv('ProgramFiles')
    paths = [os.path.join(programFiles, r'pl\bin', dllName)
             for dllName in dllNames]
    for path in paths:
        if os.path.exists(path):
            return (path, None)

    # Second try: use the find_library
    path = _findSwiplPathFromFindLib()
    if path is not None and os.path.exists(path):
        return (path, None)

    # Third try: use reg.exe to find the installation path in the registry
    # (reg should be installed in all Windows XPs)
    try:
        cmd = Popen(['reg', 'query',
                     r'HKEY_LOCAL_MACHINE\Software\SWI\Prolog',
                     '/v', 'home'], stdout=PIPE)
        ret = cmd.communicate()

        # Result is like:
        # ! REG.EXE VERSION 3.0
        #
        # HKEY_LOCAL_MACHINE\Software\SWI\Prolog
        #    home        REG_SZ  C:\Program Files\pl
        # (Note: spaces may be \t or spaces in the output)
        ret = ret[0].splitlines()
        ret = [line.decode("utf-8") for line in ret if len(line) > 0]
        pattern = re.compile('[^h]*home[^R]*REG_SZ( |\t)*(.*)$')
        match = pattern.match(ret[-1])
        if match is not None:
            path = match.group(2)

            paths = [os.path.join(path, 'bin', dllName)
                     for dllName in dllNames]
            for path in paths:
                if os.path.exists(path):
                    return (path, None)

    except OSError:
        # reg.exe not found? Weird...
        pass

    # May the exec is on path?
    (path, swiHome) = _findSwiplFromExec()
    if path is not None:
        return (path, swiHome)

    # Last try: maybe it is in the current dir
    for dllName in dllNames:
        if os.path.exists(dllName):
            return (dllName, None)

    return (None, None)


def _findSwiplLin():
    """
    This function uses several heuristics to guess where SWI-Prolog is
    installed in Linuxes.

    :returns:
        A tuple of (path to the swipl so, path to the resource file)

    :returns type:
        ({str, None}, {str, None})
    """

    # Maybe the exec is on path?
    (path, swiHome) = _findSwiplFromExec()
    if path is not None:
        return (path, swiHome)

    # If it is not, use  find_library
    path = _findSwiplPathFromFindLib()
    if path is not None:
        return (path, swiHome)

    # Our last try: some hardcoded paths.
    paths = ['/lib', '/usr/lib', '/usr/local/lib', '.', './lib']
    names = ['libswipl.so', 'libpl.so']

    path = None
    for name in names:
        for try_ in paths:
            try_ = os.path.join(try_, name)
            if os.path.exists(try_):
                path = try_
                break

    if path is not None:
        return (path, swiHome)

    return (None, None)


def walk(path, name):
    """
    This function is a 2-time recursive func,
    that findin file in dirs

    :parameters:
      -  `path` (str) - Directory path
      -  `name` (str) - Name of file, that we lookin for

    :returns:
        Path to the swipl so, path to the resource file

    :returns type:
        (str)
    """
    back_path = path[:]
    path = os.path.join(path, name)

    if os.path.exists(path):
        return path
    else:
        for dir_ in os.listdir(back_path):
            path = os.path.join(back_path, dir_)

            if os.path.isdir(path):
                res_path = walk(path, name)
                if res_path is not None:
                    return (res_path, back_path)

    return None


def _findSwiplMacOSHome():
    """
    This function is guesing where SWI-Prolog is
    installed in MacOS via .app.

    :parameters:
      -  `swi_ver` (str) - Version of SWI-Prolog in '[0-9].[0-9].[0-9]' format

    :returns:
        A tuple of (path to the swipl so, path to the resource file)

    :returns type:
        ({str, None}, {str, None})
    """

    # Need more help with MacOS
    # That way works, but need more work
    names = ['libswipl.dylib', 'libpl.dylib']

    path = os.environ.get('SWI_HOME_DIR')
    if path is None:
        path = os.environ.get('SWI_LIB_DIR')
        if path is None:
            path = os.environ.get('PLBASE')
            if path is None:
                raise Exception("SWI-Prolog home not found")  # XXX:

    paths = [path]

    for name in names:
        for path in paths:
            (path_res, back_path) = walk(path, name)

            if path_res is not None:
                os.environ['SWI_LIB_DIR'] = back_path
                return (path_res, None)

    return (None, None)


def _findSwiplDar():
    """
    This function uses several heuristics to guess where SWI-Prolog is
    installed in MacOS.

    :returns:
        A tuple of (path to the swipl so, path to the resource file)

    :returns type:
        ({str, None}, {str, None})
    """

    # If the exec is in path
    (path, swiHome) = _findSwiplFromExec()
    if path is not None:
        return (path, swiHome)

    # If it is not, use  find_library
    path = _findSwiplPathFromFindLib()
    if path is not None:
        return (path, swiHome)

    # Last guess, searching for the file
    paths = ['.', './lib', '/usr/lib/', '/usr/local/lib', '/opt/local/lib']
    names = ['libswipl.dylib', 'libpl.dylib']

    for name in names:
        for path in paths:
            path = os.path.join(path, name)
            if os.path.exists(path):
                return (path, None)

    return (None, None)


def _findSwipl():
    """
    This function makes a big effort to find the path to the SWI-Prolog shared
    library. Since this is both OS dependent and installation dependent, we may
    not aways succeed. If we do, we return a name/path that can be used by
    CDLL(). Otherwise we raise an exception.

    :return: Tuple. Fist element is the name or path to the library that can be
             used by CDLL. Second element is the path were SWI-Prolog resource
             file may be found (this is needed in some Linuxes)
    :rtype: Tuple of strings
    :raises ImportError: If we cannot guess the name of the library
    """

    # Now begins the guesswork
    platform = sys.platform[:3]
    if platform == "win":  # In Windows, we have the default installer
        # path and the registry to look
        (path, swiHome) = _findSwiplWin()

    elif platform in ("lin", "cyg"):
        (path, swiHome) = _findSwiplLin()

    elif platform == "dar":  # Help with MacOS is welcome!!
        (path, swiHome) = _findSwiplDar()

        if path is None:
            (path, swiHome) = _findSwiplMacOSHome()

    else:
        raise EnvironmentError('The platform %s is not supported by this '
                               'library. If you want it to be supported, '
                               'please open an issue.' % platform)

    # This is a catch all raise
    if path is None:
        raise ImportError('Could not find the SWI-Prolog library in this '
                          'platform. If you are sure it is installed, please '
                          'open an issue.')
    else:
        return (path, swiHome)


def _fixWindowsPath(dll):
    """
    When the path to the DLL is not in Windows search path, Windows will not be
    able to find other DLLs on the same directory, so we have to add it to the
    path. This function takes care of it.

    :parameters:
      -  `dll` (str) - File name of the DLL
    """

    if sys.platform[:3] != 'win':
        return  # Nothing to do here

    pathToDll = os.path.dirname(dll)
    currentWindowsPath = os.getenv('PATH')

    if pathToDll not in currentWindowsPath:
        # We will prepend the path, to avoid conflicts between DLLs
        newPath = pathToDll + ';' + currentWindowsPath
        os.putenv('PATH', newPath)

1	# -- coding: utf-8 --
2
3
4	# pyswip -- Python SWI-Prolog bridge
5	# Copyright (c) 2007-2018 Yüce Tekol
6	#
7	# Permission is hereby granted, free of charge, to any person obtaining a copy
8	# of this software and associated documentation files (the "Software"), to deal
9	# in the Software without restriction, including without limitation the rights
10	# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11	# copies of the Software, and to permit persons to whom the Software is
12	# furnished to do so, subject to the following conditions:
13	#
14	# The above copyright notice and this permission notice shall be included in all
15	# copies or substantial portions of the Software.
16	#
17	# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18	# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19	# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20	# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21	# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22	# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23	# SOFTWARE.
24
25	from __future__ import print_function	3✔
26	import sys	3✔
27	import os	3✔
28	import glob	3✔
29	from subprocess import Popen, PIPE	3✔
30	from ctypes.util import find_library	3✔
31
32
33	# To initialize the SWI-Prolog environment, two things need to be done: the
34	# first is to find where the SO/DLL is located and the second is to find the
35	# SWI-Prolog home, to get the saved state.
36	#
37	# The goal of the (entangled) process below is to make the library installation
38	# independent.
39
40
41	def _findSwiplPathFromFindLib():	3✔
42	"""
43	This function resorts to ctype's find_library to find the path to the
44	DLL. The biggest problem is that find_library does not give the path to the
45	resource file.
46
47	:returns:
48	A path to the swipl SO/DLL or None if it is not found.
49
50	:returns type:
51	{str, None}
52	"""
53
54	path = (find_library('swipl') or	3✔
55	find_library('pl') or
56	find_library('libswipl')) # This last one is for Windows
57	return path	3✔
58
59
60	def _findSwiplFromExec():	3✔
61	"""
62	This function tries to use an executable on the path to find SWI-Prolog
63	SO/DLL and the resource file.
64
65	:returns:
66	A tuple of (path to the swipl DLL, path to the resource file)
67
68	:returns type:
69	({str, None}, {str, None})
70	"""
71
72	platform = sys.platform[:3]	3✔
73
74	fullName = None	3✔
75	swiHome = None	3✔
76
77	try: # try to get library path from swipl executable.	3✔
78
79	# We may have pl or swipl as the executable
80	try:	3✔
81	cmd = Popen(['swipl', '-dump-runtime-variables'], stdout=PIPE)	3✔
82	except OSError:	×
83	cmd = Popen(['pl', '-dump-runtime-variables'], stdout=PIPE)	×
84	ret = cmd.communicate()	3✔
85
86	# Parse the output into a dictionary
87	ret = ret[0].decode().replace(';', '').splitlines()	3✔
88	ret = [line.split('=', 1) for line in ret]	3✔
89	rtvars = dict((name, value[1:-1]) for name, value in ret) # [1:-1] gets	3✔
90	# rid of the
91	# quotes
92
93	if rtvars['PLSHARED'] == 'no':	3✔
94	raise ImportError('SWI-Prolog is not installed as a shared '	×
95	'library.')
96	else: # PLSHARED == 'yes'
97	swiHome = rtvars['PLBASE'] # The environment is in PLBASE	3✔
98	if not os.path.exists(swiHome):	3✔
99	swiHome = None	×
100
101	# determine platform specific path
102	if platform == "win":	3✔
103	dllName = rtvars['PLLIB'][:-4] + '.' + rtvars['PLSOEXT']	×
104	path = os.path.join(rtvars['PLBASE'], 'bin')	×
105	fullName = os.path.join(path, dllName)	×
106
107	if not os.path.exists(fullName):	×
108	fullName = None	×
109
110	elif platform == "cyg":	3✔
111	# e.g. /usr/lib/pl-5.6.36/bin/i686-cygwin/cygpl.dll
112
113	dllName = 'cygpl.dll'	×
114	path = os.path.join(rtvars['PLBASE'], 'bin', rtvars['PLARCH'])	×
115	fullName = os.path.join(path, dllName)	×
116
117	if not os.path.exists(fullName):	×
118	fullName = None	×
119
120	elif platform == "dar":	3✔
121	dllName = 'lib' + rtvars['PLLIB'][2:] + '.' + rtvars['PLSOEXT']	×
122	path = os.path.join(rtvars['PLBASE'], 'lib', rtvars['PLARCH'])	×
123	baseName = os.path.join(path, dllName)	×
124
125	if os.path.exists(baseName):	×
126	fullName = baseName	×
127	else: # We will search for versions
128	fullName = None	×
129
130	else: # assume UNIX-like
131	# The SO name in some linuxes is of the form libswipl.so.5.10.2,
132	# so we have to use glob to find the correct one
133	dllName = 'lib' + rtvars['PLLIB'][2:] + '.' + rtvars['PLSOEXT']	3✔
134	path = os.path.join(rtvars['PLBASE'], 'lib', rtvars['PLARCH'])	3✔
135	baseName = os.path.join(path, dllName)	3✔
136
137	if os.path.exists(baseName):	3✔
138	fullName = baseName	×
139	else: # We will search for versions
140	pattern = baseName + '.*'	3✔
141	files = glob.glob(pattern)	3✔
142	if len(files) == 0:	3✔
143	fullName = None	3✔
144	elif len(files) == 1:	×
145	fullName = files[0]	×
146	else: # Will this ever happen?
147	fullName = None	×
148
149	except (OSError, KeyError): # KeyError from accessing rtvars	×
150	pass	×
151
152	return (fullName, swiHome)	3✔
153
154
155	def _findSwiplWin():	3✔
156	import re	×
157
158	"""
159	This function uses several heuristics to gues where SWI-Prolog is installed
160	in Windows. It always returns None as the path of the resource file because,
161	in Windows, the way to find it is more robust so the SWI-Prolog DLL is
162	always able to find it.
163
164	:returns:
165	A tuple of (path to the swipl DLL, path to the resource file)
166
167	:returns type:
168	({str, None}, {str, None})
169	"""
170
171	dllNames = ('swipl.dll', 'libswipl.dll')	×
172
173	# First try: check the usual installation path (this is faster but
174	# hardcoded)
175	programFiles = os.getenv('ProgramFiles')	×
176	paths = [os.path.join(programFiles, r'pl\bin', dllName)	×
177	for dllName in dllNames]
178	for path in paths:	×
179	if os.path.exists(path):	×
180	return (path, None)	×
181
182	# Second try: use the find_library
183	path = _findSwiplPathFromFindLib()	×
184	if path is not None and os.path.exists(path):	×
185	return (path, None)	×
186
187	# Third try: use reg.exe to find the installation path in the registry
188	# (reg should be installed in all Windows XPs)
189	try:	×
190	cmd = Popen(['reg', 'query',	×
191	r'HKEY_LOCAL_MACHINE\Software\SWI\Prolog',
192	'/v', 'home'], stdout=PIPE)
193	ret = cmd.communicate()	×
194
195	# Result is like:
196	# ! REG.EXE VERSION 3.0
197	#
198	# HKEY_LOCAL_MACHINE\Software\SWI\Prolog
199	# home REG_SZ C:\Program Files\pl
200	# (Note: spaces may be \t or spaces in the output)
201	ret = ret[0].splitlines()	×
202	ret = [line.decode("utf-8") for line in ret if len(line) > 0]	×
203	pattern = re.compile('[^h]home[^R]REG_SZ( \|\t)(.)$')	×
204	match = pattern.match(ret[-1])	×
205	if match is not None:	×
206	path = match.group(2)	×
207
208	paths = [os.path.join(path, 'bin', dllName)	×
209	for dllName in dllNames]
210	for path in paths:	×
211	if os.path.exists(path):	×
212	return (path, None)	×
213
214	except OSError:	×
215	# reg.exe not found? Weird...
216	pass	×
217
218	# May the exec is on path?
219	(path, swiHome) = _findSwiplFromExec()	×
220	if path is not None:	×
221	return (path, swiHome)	×
222
223	# Last try: maybe it is in the current dir
224	for dllName in dllNames:	×
225	if os.path.exists(dllName):	×
226	return (dllName, None)	×
227
228	return (None, None)	×
229
230
231	def _findSwiplLin():	3✔
232	"""
233	This function uses several heuristics to guess where SWI-Prolog is
234	installed in Linuxes.
235
236	:returns:
237	A tuple of (path to the swipl so, path to the resource file)
238
239	:returns type:
240	({str, None}, {str, None})
241	"""
242
243	# Maybe the exec is on path?
244	(path, swiHome) = _findSwiplFromExec()	3✔
245	if path is not None:	3✔
246	return (path, swiHome)	×
247
248	# If it is not, use find_library
249	path = _findSwiplPathFromFindLib()	3✔
250	if path is not None:	3✔
251	return (path, swiHome)	3✔
252
253	# Our last try: some hardcoded paths.
254	paths = ['/lib', '/usr/lib', '/usr/local/lib', '.', './lib']	×
255	names = ['libswipl.so', 'libpl.so']	×
256
257	path = None	×
258	for name in names:	×
259	for try_ in paths:	×
260	try_ = os.path.join(try_, name)	×
261	if os.path.exists(try_):	×
262	path = try_	×
263	break	×
264
265	if path is not None:	×
266	return (path, swiHome)	×
267
268	return (None, None)	×
269
270
271	def walk(path, name):	3✔
272	"""
273	This function is a 2-time recursive func,
274	that findin file in dirs
275
276	:parameters:
277	- `path` (str) - Directory path
278	- `name` (str) - Name of file, that we lookin for
279
280	:returns:
281	Path to the swipl so, path to the resource file
282
283	:returns type:
284	(str)
285	"""
286	back_path = path[:]	×
287	path = os.path.join(path, name)	×
288
289	if os.path.exists(path):	×
290	return path	×
291	else:
292	for dir_ in os.listdir(back_path):	×
293	path = os.path.join(back_path, dir_)	×
294
295	if os.path.isdir(path):	×
296	res_path = walk(path, name)	×
297	if res_path is not None:	×
298	return (res_path, back_path)	×
299
300	return None	×
301
302
303	def _findSwiplMacOSHome():	3✔
304	"""
305	This function is guesing where SWI-Prolog is
306	installed in MacOS via .app.
307
308	:parameters:
309	- `swi_ver` (str) - Version of SWI-Prolog in '[0-9].[0-9].[0-9]' format
310
311	:returns:
312	A tuple of (path to the swipl so, path to the resource file)
313
314	:returns type:
315	({str, None}, {str, None})
316	"""
317
318	# Need more help with MacOS
319	# That way works, but need more work
320	names = ['libswipl.dylib', 'libpl.dylib']	×
321
322	path = os.environ.get('SWI_HOME_DIR')	×
323	if path is None:	×
324	path = os.environ.get('SWI_LIB_DIR')	×
325	if path is None:	×
326	path = os.environ.get('PLBASE')	×
327	if path is None:	×
328	raise Exception("SWI-Prolog home not found") # XXX:	×
329
330	paths = [path]	×
331
332	for name in names:	×
333	for path in paths:	×
334	(path_res, back_path) = walk(path, name)	×
335
336	if path_res is not None:	×
337	os.environ['SWI_LIB_DIR'] = back_path	×
338	return (path_res, None)	×
339
340	return (None, None)	×
341
342
343	def _findSwiplDar():	3✔
344	"""
345	This function uses several heuristics to guess where SWI-Prolog is
346	installed in MacOS.
347
348	:returns:
349	A tuple of (path to the swipl so, path to the resource file)
350
351	:returns type:
352	({str, None}, {str, None})
353	"""
354
355	# If the exec is in path
356	(path, swiHome) = _findSwiplFromExec()	×
357	if path is not None:	×
358	return (path, swiHome)	×
359
360	# If it is not, use find_library
361	path = _findSwiplPathFromFindLib()	×
362	if path is not None:	×
363	return (path, swiHome)	×
364
365	# Last guess, searching for the file
366	paths = ['.', './lib', '/usr/lib/', '/usr/local/lib', '/opt/local/lib']	×
367	names = ['libswipl.dylib', 'libpl.dylib']	×
368
369	for name in names:	×
370	for path in paths:	×
371	path = os.path.join(path, name)	×
372	if os.path.exists(path):	×
373	return (path, None)	×
374
375	return (None, None)	×
376
377
378	def _findSwipl():	3✔
379	"""
380	This function makes a big effort to find the path to the SWI-Prolog shared
381	library. Since this is both OS dependent and installation dependent, we may
382	not aways succeed. If we do, we return a name/path that can be used by
383	CDLL(). Otherwise we raise an exception.
384
385	:return: Tuple. Fist element is the name or path to the library that can be
386	used by CDLL. Second element is the path were SWI-Prolog resource
387	file may be found (this is needed in some Linuxes)
388	:rtype: Tuple of strings
389	:raises ImportError: If we cannot guess the name of the library
390	"""
391
392	# Now begins the guesswork
393	platform = sys.platform[:3]	3✔
394	if platform == "win": # In Windows, we have the default installer	3✔
395	# path and the registry to look
396	(path, swiHome) = _findSwiplWin()	×
397
398	elif platform in ("lin", "cyg"):	3✔
399	(path, swiHome) = _findSwiplLin()	3✔
400
401	elif platform == "dar": # Help with MacOS is welcome!!	×
402	(path, swiHome) = _findSwiplDar()	×
403
404	if path is None:	×
405	(path, swiHome) = _findSwiplMacOSHome()	×
406
407	else:
408	raise EnvironmentError('The platform %s is not supported by this '	×
409	'library. If you want it to be supported, '
410	'please open an issue.' % platform)
411
412	# This is a catch all raise
413	if path is None:	3✔
414	raise ImportError('Could not find the SWI-Prolog library in this '	×
415	'platform. If you are sure it is installed, please '
416	'open an issue.')
417	else:
418	return (path, swiHome)	3✔
419
420
421	def _fixWindowsPath(dll):	3✔
422	"""
423	When the path to the DLL is not in Windows search path, Windows will not be
424	able to find other DLLs on the same directory, so we have to add it to the
425	path. This function takes care of it.
426
427	:parameters:
428	- `dll` (str) - File name of the DLL
429	"""
430
431	if sys.platform[:3] != 'win':	×
432	return # Nothing to do here	×
433
434	pathToDll = os.path.dirname(dll)	×
435	currentWindowsPath = os.getenv('PATH')	×
436
437	if pathToDll not in currentWindowsPath:	×
438	# We will prepend the path, to avoid conflicts between DLLs
439	newPath = pathToDll + ';' + currentWindowsPath	×
440	os.putenv('PATH', newPath)	×

yuce / pyswip / 78

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