6c53bad58f
The server is multi-threaded and will spawn a new thread for each new request. Thus, the completers need not manage their own threads or even provide async APIs; we _want_ them to block because now were implementing the request-response networking API. The client gets the async API through the network (i.e., it can do something else while the request is pending).
287 lines
9.6 KiB
Python
287 lines
9.6 KiB
Python
#!/usr/bin/env python
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#
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# Copyright (C) 2011, 2012, 2013 Strahinja Val Markovic <val@markovic.io>
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#
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# This file is part of YouCompleteMe.
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#
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# YouCompleteMe is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# YouCompleteMe is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with YouCompleteMe. If not, see <http://www.gnu.org/licenses/>.
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import abc
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import ycm_core
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from ycm.utils import ToUtf8IfNeeded
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from ycm.completers.completer_utils import TriggersForFiletype
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NO_USER_COMMANDS = 'This completer does not define any commands.'
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class Completer( object ):
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"""A base class for all Completers in YCM.
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Here's several important things you need to know if you're writing a custom
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Completer. The following are functions that the Vim part of YCM will be
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calling on your Completer:
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ShouldUseNow() is called with the start column of where a potential completion
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string should start and the current line (string) the cursor is on. For
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instance, if the user's input is 'foo.bar' and the cursor is on the 'r' in
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'bar', start_column will be the 0-based index of 'b' in the line. Your
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implementation of ShouldUseNow() should return True if your semantic completer
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should be used and False otherwise.
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This is important to get right. You want to return False if you can't provide
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completions because then the identifier completer will kick in, and that's
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better than nothing.
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Note that it's HIGHLY likely that you want to override the ShouldUseNowInner()
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function instead of ShouldUseNow() directly (although chances are that you
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probably won't have any need to override either). ShouldUseNow() will call
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your *Inner version of the function and will also make sure that the
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completion cache is taken into account. You'll see this pattern repeated
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throughout the Completer API; YCM calls the "main" version of the function and
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that function calls the *Inner version while taking into account the cache.
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The cache is important and is a nice performance boost. When the user types in
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"foo.", your completer will return a list of all member functions and
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variables that can be accessed on the "foo" object. The Completer API caches
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this list. The user will then continue typing, let's say "foo.ba". On every
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keystroke after the dot, the Completer API will take the cache into account
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and will NOT re-query your completer but will in fact provide fuzzy-search on
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the candidate strings that were stored in the cache.
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ComputeCandidates() is the main entry point when the user types. For
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"foo.bar", the user query is "bar" and completions matching this string should
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be shown. It should return the list of candidates. The format of the result
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can be a list of strings or a more complicated list of dictionaries. Use
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ycm.server.responses.BuildCompletionData to build the detailed response. See
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clang_completer.py to see how its used in practice.
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Again, you probably want to override ComputeCandidatesInner().
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You also need to implement the SupportedFiletypes() function which should
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return a list of strings, where the strings are Vim filetypes your completer
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supports.
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clang_completer.py is a good example of a "complicated" completer that A good
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example of a simple completer is ultisnips_completer.py.
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The On* functions are provided for your convenience. They are called when
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their specific events occur. For instance, the identifier completer collects
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all the identifiers in the file in OnFileReadyToParse() which gets called when
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the user stops typing for 2 seconds (Vim's CursorHold and CursorHoldI events).
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One special function is OnUserCommand. It is called when the user uses the
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command :YcmCompleter and is passed all extra arguments used on command
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invocation (e.g. OnUserCommand(['first argument', 'second'])). This can be
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used for completer-specific commands such as reloading external
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configuration.
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When the command is called with no arguments you should print a short summary
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of the supported commands or point the user to the help section where this
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information can be found.
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Override the Shutdown() member function if your Completer subclass needs to do
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custom cleanup logic on server shutdown."""
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__metaclass__ = abc.ABCMeta
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def __init__( self, user_options ):
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self.user_options = user_options
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self.min_num_chars = user_options[ 'min_num_of_chars_for_completion' ]
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self.triggers_for_filetype = TriggersForFiletype(
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user_options[ 'semantic_triggers' ] )
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self.completions_future = None
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self._completions_cache = None
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# It's highly likely you DON'T want to override this function but the *Inner
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# version of it.
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def ShouldUseNow( self, request_data ):
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inner_says_yes = self.ShouldUseNowInner( request_data )
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if not inner_says_yes:
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self._completions_cache = None
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previous_results_were_empty = ( self._completions_cache and
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self._completions_cache.CacheValid(
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request_data[ 'line_num' ],
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request_data[ 'start_column' ] ) and
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not self._completions_cache.raw_completions )
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return inner_says_yes and not previous_results_were_empty
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def ShouldUseNowInner( self, request_data ):
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current_line = request_data[ 'line_value' ]
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start_column = request_data[ 'start_column' ]
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line_length = len( current_line )
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if not line_length or start_column - 1 >= line_length:
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return False
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filetype = self._CurrentFiletype( request_data[ 'filetypes' ] )
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triggers = self.triggers_for_filetype[ filetype ]
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for trigger in triggers:
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index = -1
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trigger_length = len( trigger )
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while True:
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line_index = start_column + index
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if line_index < 0 or current_line[ line_index ] != trigger[ index ]:
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break
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if abs( index ) == trigger_length:
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return True
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index -= 1
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return False
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def QueryLengthAboveMinThreshold( self, request_data ):
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query_length = request_data[ 'column_num' ] - request_data[ 'start_column' ]
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return query_length >= self.min_num_chars
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# It's highly likely you DON'T want to override this function but the *Inner
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# version of it.
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def ComputeCandidates( self, request_data ):
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if not self.ShouldUseNow( request_data ):
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return []
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if ( request_data[ 'query' ] and
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self._completions_cache and
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self._completions_cache.CacheValid( request_data[ 'line_num' ],
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request_data[ 'start_column' ] ) ):
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return self.FilterAndSortCandidates(
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self._completions_cache.raw_completions,
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request_data[ 'query' ] )
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else:
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self._completions_cache = CompletionsCache()
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self._completions_cache.raw_completions = self.ComputeCandidatesInner(
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request_data )
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self._completions_cache.line = request_data[ 'line_num' ]
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self._completions_cache.column = request_data[ 'start_column' ]
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return self._completions_cache.raw_completions
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def ComputeCandidatesInner( self, request_data ):
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pass
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def DefinedSubcommands( self ):
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return []
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def UserCommandsHelpMessage( self ):
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subcommands = self.DefinedSubcommands()
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if subcommands:
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return ( 'Supported commands are:\n' +
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'\n'.join( subcommands ) +
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'\nSee the docs for information on what they do.' )
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else:
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return 'This Completer has no supported subcommands.'
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def FilterAndSortCandidates( self, candidates, query ):
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if not candidates:
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return []
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# We need to handle both an omni_completer style completer and a server
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# style completer
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if 'words' in candidates:
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candidates = candidates[ 'words' ]
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sort_property = ''
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if 'word' in candidates[ 0 ]:
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sort_property = 'word'
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elif 'insertion_text' in candidates[ 0 ]:
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sort_property = 'insertion_text'
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matches = ycm_core.FilterAndSortCandidates(
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candidates,
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sort_property,
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ToUtf8IfNeeded( query ) )
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return matches
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def OnFileReadyToParse( self, request_data ):
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pass
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def OnBufferVisit( self, request_data ):
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pass
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def OnBufferUnload( self, request_data ):
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pass
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def OnInsertLeave( self, request_data ):
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pass
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def OnUserCommand( self, arguments, request_data ):
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raise NotImplementedError( NO_USER_COMMANDS )
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def OnCurrentIdentifierFinished( self, request_data ):
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pass
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def DiagnosticsForCurrentFileReady( self ):
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return False
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def GetDiagnosticsForCurrentFile( self ):
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return []
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def GetDetailedDiagnostic( self ):
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pass
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def GettingCompletions( self ):
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return False
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def _CurrentFiletype( self, filetypes ):
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supported = self.SupportedFiletypes()
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for filetype in filetypes:
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if filetype in supported:
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return filetype
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return filetypes[0]
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@abc.abstractmethod
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def SupportedFiletypes( self ):
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pass
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def DebugInfo( self, request_data ):
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return ''
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def Shutdown( self ):
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pass
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class CompletionsCache( object ):
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def __init__( self ):
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self.line = -1
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self.column = -1
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self.raw_completions = []
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self.filtered_completions = []
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def CacheValid( self, current_line, start_column ):
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return current_line == self.line and start_column == self.column
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