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authorKarel Kočí <cynerd@email.cz>2016-06-30 16:03:25 +0200
committerKarel Kočí <cynerd@email.cz>2016-06-30 16:03:25 +0200
commite573b3020c032400eed60b649a2cbf55266e6bb0 (patch)
tree8f572394ac8433529c7a8e70d160a2fbe8268b4e /vim/bundle/YouCompleteMe/python/ycm/paths.py
parentb8c667bd64b3edd38d56c63c5bd1db53a23b4499 (diff)
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+# Copyright (C) 2015 YouCompleteMe contributors.
+#
+# This file is part of YouCompleteMe.
+#
+# YouCompleteMe is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# YouCompleteMe is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with YouCompleteMe. If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import unicode_literals
+from __future__ import print_function
+from __future__ import division
+from __future__ import absolute_import
+from future import standard_library
+standard_library.install_aliases()
+from builtins import * # noqa
+
+import os
+import sys
+import vim
+import functools
+import re
+
+# Can't import these from setup.py because it makes nosetests go crazy.
+DIR_OF_CURRENT_SCRIPT = os.path.dirname( os.path.abspath( __file__ ) )
+DIR_OF_YCMD = os.path.join( DIR_OF_CURRENT_SCRIPT, '..', '..', 'third_party',
+ 'ycmd' )
+WIN_PYTHON_PATH = os.path.join( sys.exec_prefix, 'python.exe' )
+PYTHON_BINARY_REGEX = re.compile(
+ r'python((2(\.[67])?)|(3(\.[3-9])?))?(.exe)?$' )
+
+
+def Memoize( obj ):
+ cache = obj.cache = {}
+
+ @functools.wraps( obj )
+ def memoizer( *args, **kwargs ):
+ key = str( args ) + str( kwargs )
+ if key not in cache:
+ cache[ key ] = obj( *args, **kwargs )
+ return cache[ key ]
+ return memoizer
+
+
+@Memoize
+def PathToPythonInterpreter():
+ from ycmd import utils
+
+ python_interpreter = vim.eval( 'g:ycm_server_python_interpreter' )
+
+ if python_interpreter:
+ if IsPythonVersionCorrect( python_interpreter ):
+ return python_interpreter
+
+ raise RuntimeError( "Path in 'g:ycm_server_python_interpreter' option "
+ "does not point to a valid Python 2.6+ or 3.3+." )
+
+ python_interpreter = _PathToPythonUsedDuringBuild()
+ if IsPythonVersionCorrect( python_interpreter ):
+ return python_interpreter
+
+ # On UNIX platforms, we use sys.executable as the Python interpreter path.
+ # We cannot use sys.executable on Windows because for unknown reasons, it
+ # returns the Vim executable. Instead, we use sys.exec_prefix to deduce the
+ # interpreter path.
+ python_interpreter = ( WIN_PYTHON_PATH if utils.OnWindows() else
+ sys.executable )
+
+ if IsPythonVersionCorrect( python_interpreter ):
+ return python_interpreter
+
+ # As a last resort, we search python in the PATH. We prefer Python 2 over 3
+ # for the sake of backwards compatibility with ycm_extra_conf.py files out
+ # there; few people wrote theirs to work on py3.
+ # So we check 'python2' before 'python' because on some distributions (Arch
+ # Linux for example), python refers to python3.
+ python_interpreter = utils.PathToFirstExistingExecutable( [ 'python2',
+ 'python',
+ 'python3' ] )
+
+ if IsPythonVersionCorrect( python_interpreter ):
+ return python_interpreter
+
+ raise RuntimeError( "Cannot find Python 2.6+ or 3.3+. You can set its path "
+ "using the 'g:ycm_server_python_interpreter' "
+ "option." )
+
+
+def _PathToPythonUsedDuringBuild():
+ from ycmd import utils
+
+ try:
+ filepath = os.path.join( DIR_OF_YCMD, 'PYTHON_USED_DURING_BUILDING' )
+ return utils.ReadFile( filepath ).strip()
+ # We need to check for IOError for Python2 and OSError for Python3
+ except ( IOError, OSError ):
+ return None
+
+
+def EndsWithPython( path ):
+ """Check if given path ends with a python 2.6+ or 3.3+ name."""
+ return path and PYTHON_BINARY_REGEX.search( path ) is not None
+
+
+def IsPythonVersionCorrect( path ):
+ """Check if given path is the Python interpreter version 2.6+ or 3.3+."""
+ from ycmd import utils
+
+ if not EndsWithPython( path ):
+ return False
+
+ command = [ path,
+ '-c',
+ "import sys;"
+ "major, minor = sys.version_info[ :2 ];"
+ "good_python = ( major == 2 and minor >= 6 ) "
+ "or ( major == 3 and minor >= 3 ) or major > 3;"
+ # If this looks weird, remember that:
+ # int( True ) == 1
+ # int( False ) == 0
+ "sys.exit( not good_python )" ]
+
+ return utils.SafePopen( command ).wait() == 0
+
+
+def PathToServerScript():
+ return os.path.join( DIR_OF_YCMD, 'ycmd' )