YouCompleteMe/python/ycm/youcompleteme.py

# Copyright (C) 2011, 2012  Google Inc.
#
# 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/>.

import os
import vim
import tempfile
import json
import re
import signal
import base64
from subprocess import PIPE
from ycm import paths, vimsupport
from ycmd import utils
from ycmd.request_wrap import RequestWrap
from ycm.diagnostic_interface import DiagnosticInterface
from ycm.omni_completer import OmniCompleter
from ycm import syntax_parse
from ycm.client.ycmd_keepalive import YcmdKeepalive
from ycm.client.base_request import BaseRequest, BuildRequestData
from ycm.client.completer_available_request import SendCompleterAvailableRequest
from ycm.client.command_request import SendCommandRequest
from ycm.client.completion_request import ( CompletionRequest,
                                            ConvertCompletionDataToVimData )
from ycm.client.omni_completion_request import OmniCompletionRequest
from ycm.client.event_notification import ( SendEventNotificationAsync,
                                            EventNotification )
from ycmd.responses import ServerError

try:
  from UltiSnips import UltiSnips_Manager
  USE_ULTISNIPS_DATA = True
except ImportError:
  USE_ULTISNIPS_DATA = False

def PatchNoProxy():
  current_value = os.environ.get('no_proxy', '')
  additions = '127.0.0.1,localhost'
  os.environ['no_proxy'] = ( additions if not current_value
                             else current_value + ',' + additions )

# We need this so that Requests doesn't end up using the local HTTP proxy when
# talking to ycmd. Users should actually be setting this themselves when
# configuring a proxy server on their machine, but most don't know they need to
# or how to do it, so we do it for them.
# Relevant issues:
#  https://github.com/Valloric/YouCompleteMe/issues/641
#  https://github.com/kennethreitz/requests/issues/879
PatchNoProxy()

# Force the Python interpreter embedded in Vim (in which we are running) to
# ignore the SIGINT signal. This helps reduce the fallout of a user pressing
# Ctrl-C in Vim.
signal.signal( signal.SIGINT, signal.SIG_IGN )

HMAC_SECRET_LENGTH = 16
SERVER_CRASH_MESSAGE_STDERR_FILE = (
  "The ycmd server SHUT DOWN (restart with ':YcmRestartServer'). "
  "Run ':YcmToggleLogs stderr' to check the logs." )
SERVER_CRASH_MESSAGE_STDERR_FILE_DELETED = (
  "The ycmd server SHUT DOWN (restart with ':YcmRestartServer'). "
  "Logfile was deleted; set 'g:ycm_server_keep_logfiles' to see errors "
  "in the future." )
SERVER_IDLE_SUICIDE_SECONDS = 10800  # 3 hours
DIAGNOSTIC_UI_FILETYPES = set( [ 'cpp', 'cs', 'c', 'objc', 'objcpp' ] )


class YouCompleteMe( object ):
  def __init__( self, user_options ):
    self._user_options = user_options
    self._user_notified_about_crash = False
    self._diag_interface = DiagnosticInterface( user_options )
    self._omnicomp = OmniCompleter( user_options )
    self._latest_file_parse_request = None
    self._latest_completion_request = None
    self._latest_diagnostics = []
    self._server_stdout = None
    self._server_stderr = None
    self._server_popen = None
    self._filetypes_with_keywords_loaded = set()
    self._ycmd_keepalive = YcmdKeepalive()
    self._SetupServer()
    self._ycmd_keepalive.Start()
    self._complete_done_hooks = {
      'cs': lambda( self ): self._OnCompleteDone_Csharp()
    }

  def _SetupServer( self ):
    self._available_completers = {}
    server_port = utils.GetUnusedLocalhostPort()
    # The temp options file is deleted by ycmd during startup
    with tempfile.NamedTemporaryFile( delete = False ) as options_file:
      hmac_secret = os.urandom( HMAC_SECRET_LENGTH )
      options_dict = dict( self._user_options )
      options_dict[ 'hmac_secret' ] = base64.b64encode( hmac_secret )
      json.dump( options_dict, options_file )
      options_file.flush()

      args = [ paths.PathToPythonInterpreter(),
               paths.PathToServerScript(),
               '--port={0}'.format( server_port ),
               '--options_file={0}'.format( options_file.name ),
               '--log={0}'.format( self._user_options[ 'server_log_level' ] ),
               '--idle_suicide_seconds={0}'.format(
                  SERVER_IDLE_SUICIDE_SECONDS )]

      filename_format = os.path.join( utils.PathToTempDir(),
                                      'server_{port}_{std}.log' )

      self._server_stdout = filename_format.format( port = server_port,
                                                    std = 'stdout' )
      self._server_stderr = filename_format.format( port = server_port,
                                                    std = 'stderr' )
      args.append( '--stdout={0}'.format( self._server_stdout ) )
      args.append( '--stderr={0}'.format( self._server_stderr ) )

      if self._user_options[ 'server_keep_logfiles' ]:
        args.append( '--keep_logfiles' )

      self._server_popen = utils.SafePopen( args, stdin_windows = PIPE,
                                            stdout = PIPE, stderr = PIPE)
      BaseRequest.server_location = 'http://127.0.0.1:' + str( server_port )
      BaseRequest.hmac_secret = hmac_secret

    self._NotifyUserIfServerCrashed()

  def IsServerAlive( self ):
    returncode = self._server_popen.poll()
    # When the process hasn't finished yet, poll() returns None.
    return returncode is None


  def _NotifyUserIfServerCrashed( self ):
    if self._user_notified_about_crash or self.IsServerAlive():
      return
    self._user_notified_about_crash = True
    try:
      vimsupport.CheckFilename( self._server_stderr )
      vimsupport.PostVimMessage( SERVER_CRASH_MESSAGE_STDERR_FILE )
    except RuntimeError:
      vimsupport.PostVimMessage( SERVER_CRASH_MESSAGE_STDERR_FILE_DELETED )


  def ServerPid( self ):
    if not self._server_popen:
      return -1
    return self._server_popen.pid


  def _ServerCleanup( self ):
    if self.IsServerAlive():
      self._server_popen.terminate()


  def RestartServer( self ):
    self._CloseLogs()
    vimsupport.PostVimMessage( 'Restarting ycmd server...' )
    self._user_notified_about_crash = False
    self._ServerCleanup()
    self._SetupServer()


  def CreateCompletionRequest( self, force_semantic = False ):
    request_data = BuildRequestData()
    if ( not self.NativeFiletypeCompletionAvailable() and
         self.CurrentFiletypeCompletionEnabled() ):
      wrapped_request_data = RequestWrap( request_data )
      if self._omnicomp.ShouldUseNow( wrapped_request_data ):
        self._latest_completion_request = OmniCompletionRequest(
            self._omnicomp, wrapped_request_data )
        return self._latest_completion_request

    request_data[ 'working_dir' ] = os.getcwd()

    self._AddExtraConfDataIfNeeded( request_data )
    if force_semantic:
      request_data[ 'force_semantic' ] = True
    self._latest_completion_request = CompletionRequest( request_data )
    return self._latest_completion_request


  def SendCommandRequest( self, arguments, completer ):
    if self.IsServerAlive():
      return SendCommandRequest( arguments, completer )


  def GetDefinedSubcommands( self ):
    if self.IsServerAlive():
      try:
        return BaseRequest.PostDataToHandler( BuildRequestData(),
                                             'defined_subcommands' )
      except ServerError:
        return []
    else:
      return []


  def GetCurrentCompletionRequest( self ):
    return self._latest_completion_request


  def GetOmniCompleter( self ):
    return self._omnicomp


  def FiletypeCompleterExistsForFiletype( self, filetype ):
    try:
      return self._available_completers[ filetype ]
    except KeyError:
      pass

    if not self.IsServerAlive():
      return False

    exists_completer = SendCompleterAvailableRequest( filetype )
    if exists_completer is None:
      return False

    self._available_completers[ filetype ] = exists_completer
    return exists_completer


  def NativeFiletypeCompletionAvailable( self ):
    return any( [ self.FiletypeCompleterExistsForFiletype( x ) for x in
                  vimsupport.CurrentFiletypes() ] )


  def NativeFiletypeCompletionUsable( self ):
    return ( self.CurrentFiletypeCompletionEnabled() and
             self.NativeFiletypeCompletionAvailable() )


  def OnFileReadyToParse( self ):
    self._omnicomp.OnFileReadyToParse( None )

    if not self.IsServerAlive():
      self._NotifyUserIfServerCrashed()

    extra_data = {}
    self._AddTagsFilesIfNeeded( extra_data )
    self._AddSyntaxDataIfNeeded( extra_data )
    self._AddExtraConfDataIfNeeded( extra_data )

    self._latest_file_parse_request = EventNotification( 'FileReadyToParse',
                                                          extra_data )
    self._latest_file_parse_request.Start()


  def OnBufferUnload( self, deleted_buffer_file ):
    if not self.IsServerAlive():
      return
    SendEventNotificationAsync( 'BufferUnload',
                                { 'unloaded_buffer': deleted_buffer_file } )


  def OnBufferVisit( self ):
    if not self.IsServerAlive():
      return
    extra_data = {}
    _AddUltiSnipsDataIfNeeded( extra_data )
    SendEventNotificationAsync( 'BufferVisit', extra_data )


  def OnInsertLeave( self ):
    if not self.IsServerAlive():
      return
    SendEventNotificationAsync( 'InsertLeave' )


  def OnCursorMoved( self ):
    self._diag_interface.OnCursorMoved()


  def OnVimLeave( self ):
    self._ServerCleanup()


  def OnCurrentIdentifierFinished( self ):
    if not self.IsServerAlive():
      return
    SendEventNotificationAsync( 'CurrentIdentifierFinished' )


  def OnCompleteDone( self ):
    complete_done_actions = self.GetCompleteDoneHooks()
    for action in complete_done_actions:
      action(self)


  def GetCompleteDoneHooks( self ):
    filetypes = vimsupport.CurrentFiletypes()
    for key, value in self._complete_done_hooks.iteritems():
      if key in filetypes:
        yield value


  def GetCompletionsUserMayHaveCompleted( self ):
    latest_completion_request = self.GetCurrentCompletionRequest()
    if not latest_completion_request or not latest_completion_request.Done():
      return []

    completions = latest_completion_request.RawResponse()

    result = self._FilterToMatchingCompletions( completions, True )
    result = list( result )
    if result:
      return result

    if self._HasCompletionsThatCouldBeCompletedWithMoreText( completions ):
      # Since the way that YCM works leads to CompleteDone called on every
      # character, return blank if the completion might not be done. This won't
      # match if the completion is ended with typing a non-keyword character.
      return []

    result = self._FilterToMatchingCompletions( completions, False )

    return list( result )


  def _FilterToMatchingCompletions( self, completions, full_match_only ):
    self._PatchBasedOnVimVersion()
    return self._FilterToMatchingCompletions( completions, full_match_only)


  def _HasCompletionsThatCouldBeCompletedWithMoreText( self, completions ):
    self._PatchBasedOnVimVersion()
    return self._HasCompletionsThatCouldBeCompletedWithMoreText( completions )


  def _PatchBasedOnVimVersion( self ):
    if vimsupport.VimVersionAtLeast( "7.4.774" ):
      self._HasCompletionsThatCouldBeCompletedWithMoreText = \
        self._HasCompletionsThatCouldBeCompletedWithMoreText_NewerVim
      self._FilterToMatchingCompletions = \
        self._FilterToMatchingCompletions_NewerVim
    else:
      self._FilterToMatchingCompletions = \
        self._FilterToMatchingCompletions_OlderVim
      self._HasCompletionsThatCouldBeCompletedWithMoreText = \
        self._HasCompletionsThatCouldBeCompletedWithMoreText_OlderVim


  def _FilterToMatchingCompletions_NewerVim( self, completions,
                                             full_match_only ):
    """ Filter to completions matching the item Vim said was completed """
    completed = vimsupport.GetVariableValue( 'v:completed_item' )
    for completion in completions:
      item = ConvertCompletionDataToVimData( completion )
      match_keys = ( [ "word", "abbr", "menu", "info" ] if full_match_only
                      else [ 'word' ] )
      matcher = lambda key: completed.get( key, "" ) == item.get( key, "" )
      if all( [ matcher( i ) for i in match_keys ] ):
        yield completion


  def _FilterToMatchingCompletions_OlderVim( self, completions,
                                             full_match_only ):
    """ Filter to completions matching the buffer text """
    if full_match_only:
      return # Only supported in 7.4.774+
    # No support for multiple line completions
    text = vimsupport.TextBeforeCursor()
    for completion in completions:
      word = completion[ "insertion_text" ]
      # Trim complete-ending character if needed
      text = re.sub( r"[^a-zA-Z0-9_]$", "", text )
      buffer_text = text[ -1 * len( word ) : ]
      if buffer_text == word:
        yield completion


  def _HasCompletionsThatCouldBeCompletedWithMoreText_NewerVim( self,
                                                                completions ):
    completed_item = vimsupport.GetVariableValue( 'v:completed_item' )
    if not completed_item:
      return False

    completed_word = completed_item[ 'word' ]
    if not completed_word:
      return False

    # Sometime CompleteDone is called after the next character is inserted
    # If so, use inserted character to filter possible completions further
    text = vimsupport.TextBeforeCursor()
    reject_exact_match = True
    if text and text[ -1 ] != completed_word[ -1 ]:
      reject_exact_match = False
      completed_word += text[ -1 ]

    for completion in completions:
      word = ConvertCompletionDataToVimData( completion )[ 'word' ]
      if reject_exact_match and word == completed_word:
        continue
      if word.startswith( completed_word ):
        return True
    return False


  def _HasCompletionsThatCouldBeCompletedWithMoreText_OlderVim( self,
                                                                completions ):
    # No support for multiple line completions
    text = vimsupport.TextBeforeCursor()
    for completion in completions:
      word = ConvertCompletionDataToVimData( completion )[ 'word' ]
      for i in range( 1, len( word ) - 1 ): # Excluding full word
        if text[ -1 * i  : ] == word[ : i ]:
          return True
    return False



  def _OnCompleteDone_Csharp( self ):
    completions = self.GetCompletionsUserMayHaveCompleted()
    namespaces = [ self._GetRequiredNamespaceImport( c )
                   for c in completions ]
    namespaces = [ n for n in namespaces if n ]
    if not namespaces:
      return

    if len( namespaces ) > 1:
      choices = [ "{0} {1}".format( i + 1, n )
                  for i,n in enumerate( namespaces ) ]
      choice = vimsupport.PresentDialog( "Insert which namespace:", choices )
      if choice < 0:
        return
      namespace = namespaces[ choice ]
    else:
      namespace = namespaces[ 0 ]

    vimsupport.InsertNamespace( namespace )


  def _GetRequiredNamespaceImport( self, completion ):
    if ( "extra_data" not in completion
         or "required_namespace_import" not in completion[ "extra_data" ] ):
      return None
    return completion[ "extra_data" ][ "required_namespace_import" ]


  def GetErrorCount( self ):
    return self._diag_interface.GetErrorCount()


  def GetWarningCount( self ):
    return self._diag_interface.GetWarningCount()


  def DiagnosticUiSupportedForCurrentFiletype( self ):
    return any( [ x in DIAGNOSTIC_UI_FILETYPES
                  for x in vimsupport.CurrentFiletypes() ] )


  def ShouldDisplayDiagnostics( self ):
    return bool( self._user_options[ 'show_diagnostics_ui' ] and
                 self.DiagnosticUiSupportedForCurrentFiletype() )


  def PopulateLocationListWithLatestDiagnostics( self ):
    # Do nothing if loc list is already populated by diag_interface
    if not self._user_options[ 'always_populate_location_list' ]:
      self._diag_interface.PopulateLocationList( self._latest_diagnostics )
    return bool( self._latest_diagnostics )


  def UpdateDiagnosticInterface( self ):
    self._diag_interface.UpdateWithNewDiagnostics( self._latest_diagnostics )


  def FileParseRequestReady( self, block = False ):
    return bool( self._latest_file_parse_request and
                 ( block or self._latest_file_parse_request.Done() ) )


  def HandleFileParseRequest( self, block = False ):
    # Order is important here:
    # FileParseRequestReady has a low cost, while
    # NativeFiletypeCompletionUsable is a blocking server request
    if ( self.FileParseRequestReady( block ) and
         self.NativeFiletypeCompletionUsable() ):

      if self.ShouldDisplayDiagnostics():
        self._latest_diagnostics = self._latest_file_parse_request.Response()
        self.UpdateDiagnosticInterface()
      else:
        # YCM client has a hard-coded list of filetypes which are known
        # to support diagnostics, self.DiagnosticUiSupportedForCurrentFiletype()
        #
        # For filetypes which don't support diagnostics, we just want to check
        # the _latest_file_parse_request for any exception or UnknownExtraConf
        # response, to allow the server to raise configuration warnings, etc.
        # to the user. We ignore any other supplied data.
        self._latest_file_parse_request.Response()

      # We set the file parse request to None because we want to prevent
      # repeated issuing of the same warnings/errors/prompts. Setting this to
      # None makes FileParseRequestReady return False until the next
      # request is created.
      #
      # Note: it is the server's responsibility to determine the frequency of
      # error/warning/prompts when receiving a FileReadyToParse event, but
      # it our responsibility to ensure that we only apply the
      # warning/error/prompt received once (for each event).
      self._latest_file_parse_request = None


  def ShowDetailedDiagnostic( self ):
    if not self.IsServerAlive():
      return
    try:
      debug_info = BaseRequest.PostDataToHandler( BuildRequestData(),
                                                  'detailed_diagnostic' )
      if 'message' in debug_info:
        vimsupport.EchoText( debug_info[ 'message' ] )
    except ServerError as e:
      vimsupport.PostVimMessage( str( e ) )


  def DebugInfo( self ):
    if self.IsServerAlive():
      debug_info = BaseRequest.PostDataToHandler( BuildRequestData(),
                                                  'debug_info' )
    else:
      debug_info = 'Server crashed, no debug info from server'
    debug_info += '\nServer running at: {0}'.format(
        BaseRequest.server_location )
    debug_info += '\nServer process ID: {0}'.format( self._server_popen.pid )
    if self._server_stderr or self._server_stdout:
      debug_info += '\nServer logfiles:\n  {0}\n  {1}'.format(
        self._server_stdout,
        self._server_stderr )

    return debug_info


  def _OpenLogs( self, stdout = True, stderr = True ):
    # Open log files in a horizontal window with the same behavior as the
    # preview window (same height and winfixheight enabled). Automatically
    # watch for changes. Set the cursor position at the end of the file.
    options = {
      'size': vimsupport.GetIntValue( '&previewheight' ),
      'fix': True,
      'watch': True,
      'position': 'end'
    }

    if stdout:
      vimsupport.OpenFilename( self._server_stdout, options )
    if stderr:
      vimsupport.OpenFilename( self._server_stderr, options )


  def _CloseLogs( self, stdout = True, stderr = True ):
    if stdout:
      vimsupport.CloseBuffersForFilename( self._server_stdout )
    if stderr:
      vimsupport.CloseBuffersForFilename( self._server_stderr )


  def ToggleLogs( self, stdout = True, stderr = True ):
    if ( stdout and
         vimsupport.BufferIsVisibleForFilename( self._server_stdout ) or
         stderr and
         vimsupport.BufferIsVisibleForFilename( self._server_stderr ) ):
      return self._CloseLogs( stdout = stdout, stderr = stderr )

    # Close hidden logfile buffers if any to keep a clean state
    self._CloseLogs( stdout = stdout, stderr = stderr )

    try:
      self._OpenLogs( stdout = stdout, stderr = stderr )
    except RuntimeError as error:
      vimsupport.PostVimMessage( 'YouCompleteMe encountered an error when '
                                 'opening logs: {0}.'.format( error ) )


  def CurrentFiletypeCompletionEnabled( self ):
    filetypes = vimsupport.CurrentFiletypes()
    filetype_to_disable = self._user_options[
      'filetype_specific_completion_to_disable' ]
    if '*' in filetype_to_disable:
      return False
    else:
      return not any([ x in filetype_to_disable for x in filetypes ])


  def _AddSyntaxDataIfNeeded( self, extra_data ):
    if not self._user_options[ 'seed_identifiers_with_syntax' ]:
      return
    filetype = vimsupport.CurrentFiletypes()[ 0 ]
    if filetype in self._filetypes_with_keywords_loaded:
      return

    self._filetypes_with_keywords_loaded.add( filetype )
    extra_data[ 'syntax_keywords' ] = list(
       syntax_parse.SyntaxKeywordsForCurrentBuffer() )


  def _AddTagsFilesIfNeeded( self, extra_data ):
    def GetTagFiles():
      tag_files = vim.eval( 'tagfiles()' )
      # getcwd() throws an exception when the CWD has been deleted.
      try:
        current_working_directory = os.getcwd()
      except OSError:
        return []
      return [ os.path.join( current_working_directory, x ) for x in tag_files ]

    if not self._user_options[ 'collect_identifiers_from_tags_files' ]:
      return
    extra_data[ 'tag_files' ] = GetTagFiles()


  def _AddExtraConfDataIfNeeded( self, extra_data ):
    def BuildExtraConfData( extra_conf_vim_data ):
      return dict( ( expr, vimsupport.VimExpressionToPythonType( expr ) )
                   for expr in extra_conf_vim_data )

    extra_conf_vim_data = self._user_options[ 'extra_conf_vim_data' ]
    if extra_conf_vim_data:
      extra_data[ 'extra_conf_data' ] = BuildExtraConfData(
        extra_conf_vim_data )


def _AddUltiSnipsDataIfNeeded( extra_data ):
  if not USE_ULTISNIPS_DATA:
    return

  try:
    # Since UltiSnips may run in a different python interpreter (python 3) than
    # YCM, UltiSnips_Manager singleton is not necessary the same as the one
    # used by YCM. In particular, it means that we cannot rely on UltiSnips to
    # set the current filetypes to the singleton. We need to do it ourself.
    UltiSnips_Manager.reset_buffer_filetypes()
    UltiSnips_Manager.add_buffer_filetypes(
      vimsupport.GetVariableValue( '&filetype' ) )
    rawsnips = UltiSnips_Manager._snips( '', True )
  except:
    return

  # UltiSnips_Manager._snips() returns a class instance where:
  # class.trigger - name of snippet trigger word ( e.g. defn or testcase )
  # class.description - description of the snippet
  extra_data[ 'ultisnips_snippets' ] = [ { 'trigger': x.trigger,
                                           'description': x.description
                                         } for x in rawsnips ]