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clang_completer.py
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clang_completer.py
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# Copyright (C) 2011, 2012 Google Inc.
#
# This file is part of ycmd.
#
# ycmd 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.
#
# ycmd 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 ycmd. 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
from future.utils import iteritems
from collections import defaultdict
import ycm_core
import re
import os.path
import textwrap
from ycmd import responses
from ycmd import extra_conf_store
from ycmd.utils import ToCppStringCompatible, ToUnicode
from ycmd.completers.completer import Completer
from ycmd.completers.completer_utils import GetIncludeStatementValue
from ycmd.completers.cpp.flags import Flags, PrepareFlagsForClang
from ycmd.completers.cpp.ephemeral_values_set import EphemeralValuesSet
from ycmd.responses import NoExtraConfDetected, UnknownExtraConf
import xml.etree.ElementTree
CLANG_FILETYPES = set( [ 'c', 'cpp', 'objc', 'objcpp' ] )
PARSING_FILE_MESSAGE = 'Still parsing file, no completions yet.'
NO_COMPILE_FLAGS_MESSAGE = 'Still no compile flags, no completions yet.'
INVALID_FILE_MESSAGE = 'File is invalid.'
NO_COMPLETIONS_MESSAGE = 'No completions found; errors in the file?'
NO_DIAGNOSTIC_MESSAGE = 'No diagnostic for current line!'
PRAGMA_DIAG_TEXT_TO_IGNORE = '#pragma once in main file'
TOO_MANY_ERRORS_DIAG_TEXT_TO_IGNORE = 'too many errors emitted, stopping now'
NO_DOCUMENTATION_MESSAGE = 'No documentation available for current context'
class ClangCompleter( Completer ):
def __init__( self, user_options ):
super( ClangCompleter, self ).__init__( user_options )
self._max_diagnostics_to_display = user_options[
'max_diagnostics_to_display' ]
self._completer = ycm_core.ClangCompleter()
self._flags = Flags()
self._diagnostic_store = None
self._files_being_compiled = EphemeralValuesSet()
def SupportedFiletypes( self ):
return CLANG_FILETYPES
def GetUnsavedFilesVector( self, request_data ):
files = ycm_core.UnsavedFileVector()
for filename, file_data in iteritems( request_data[ 'file_data' ] ):
if not ClangAvailableForFiletypes( file_data[ 'filetypes' ] ):
continue
contents = file_data[ 'contents' ]
if not contents or not filename:
continue
unsaved_file = ycm_core.UnsavedFile()
utf8_contents = ToCppStringCompatible( contents )
unsaved_file.contents_ = utf8_contents
unsaved_file.length_ = len( utf8_contents )
unsaved_file.filename_ = ToCppStringCompatible( filename )
files.append( unsaved_file )
return files
def ComputeCandidatesInner( self, request_data ):
filename = request_data[ 'filepath' ]
if not filename:
return
if self._completer.UpdatingTranslationUnit(
ToCppStringCompatible( filename ) ):
raise RuntimeError( PARSING_FILE_MESSAGE )
flags = self._FlagsForRequest( request_data )
if not flags:
raise RuntimeError( NO_COMPILE_FLAGS_MESSAGE )
files = self.GetUnsavedFilesVector( request_data )
line = request_data[ 'line_num' ]
column = request_data[ 'start_column' ]
with self._files_being_compiled.GetExclusive( filename ):
results = self._completer.CandidatesForLocationInFile(
ToCppStringCompatible( filename ),
line,
column,
files,
flags )
if not results:
raise RuntimeError( NO_COMPLETIONS_MESSAGE )
return [ ConvertCompletionData( x ) for x in results ]
def GetSubcommandsMap( self ):
return {
'GoToDefinition' : ( lambda self, request_data, args:
self._GoToDefinition( request_data ) ),
'GoToDeclaration' : ( lambda self, request_data, args:
self._GoToDeclaration( request_data ) ),
'GoTo' : ( lambda self, request_data, args:
self._GoTo( request_data ) ),
'GoToImprecise' : ( lambda self, request_data, args:
self._GoToImprecise( request_data ) ),
'GoToInclude' : ( lambda self, request_data, args:
self._GoToInclude( request_data ) ),
'ClearCompilationFlagCache': ( lambda self, request_data, args:
self._ClearCompilationFlagCache() ),
'GetType' : ( lambda self, request_data, args:
self._GetSemanticInfo( request_data, func = 'GetTypeAtLocation' ) ),
'GetTypeImprecise' : ( lambda self, request_data, args:
self._GetSemanticInfo( request_data,
func = 'GetTypeAtLocation',
reparse = False ) ),
'GetParent' : ( lambda self, request_data, args:
self._GetSemanticInfo( request_data,
func = 'GetEnclosingFunctionAtLocation' ) ),
'FixIt' : ( lambda self, request_data, args:
self._FixIt( request_data ) ),
'GetDoc' : ( lambda self, request_data, args:
self._GetSemanticInfo( request_data,
reparse = True,
func = 'GetDocsForLocationInFile',
response_builder = _BuildGetDocResponse ) ),
'GetDocImprecise' : ( lambda self, request_data, args:
self._GetSemanticInfo( request_data,
reparse = False,
func = 'GetDocsForLocationInFile',
response_builder = _BuildGetDocResponse ) ),
}
def _LocationForGoTo( self, goto_function, request_data, reparse = True ):
filename = request_data[ 'filepath' ]
if not filename:
raise ValueError( INVALID_FILE_MESSAGE )
flags = self._FlagsForRequest( request_data )
if not flags:
raise ValueError( NO_COMPILE_FLAGS_MESSAGE )
files = self.GetUnsavedFilesVector( request_data )
line = request_data[ 'line_num' ]
column = request_data[ 'column_num' ]
return getattr( self._completer, goto_function )(
ToCppStringCompatible( filename ),
line,
column,
files,
flags,
reparse )
def _GoToDefinition( self, request_data ):
location = self._LocationForGoTo( 'GetDefinitionLocation', request_data )
if not location or not location.IsValid():
raise RuntimeError( 'Can\'t jump to definition.' )
return _ResponseForLocation( location )
def _GoToDeclaration( self, request_data ):
location = self._LocationForGoTo( 'GetDeclarationLocation', request_data )
if not location or not location.IsValid():
raise RuntimeError( 'Can\'t jump to declaration.' )
return _ResponseForLocation( location )
def _GoTo( self, request_data ):
include_response = self._ResponseForInclude( request_data )
if include_response:
return include_response
location = self._LocationForGoTo( 'GetDefinitionLocation', request_data )
if not location or not location.IsValid():
location = self._LocationForGoTo( 'GetDeclarationLocation', request_data )
if not location or not location.IsValid():
raise RuntimeError( 'Can\'t jump to definition or declaration.' )
return _ResponseForLocation( location )
def _GoToImprecise( self, request_data ):
include_response = self._ResponseForInclude( request_data )
if include_response:
return include_response
location = self._LocationForGoTo( 'GetDefinitionLocation',
request_data,
reparse = False )
if not location or not location.IsValid():
location = self._LocationForGoTo( 'GetDeclarationLocation',
request_data,
reparse = False )
if not location or not location.IsValid():
raise RuntimeError( 'Can\'t jump to definition or declaration.' )
return _ResponseForLocation( location )
def _ResponseForInclude( self, request_data ):
"""Returns response for include file location if cursor is on the
include statement, None otherwise.
Throws RuntimeError if cursor is on include statement and corresponding
include file not found."""
current_line = request_data[ 'line_value' ]
include_file_name, quoted_include = GetIncludeStatementValue( current_line )
if not include_file_name:
return None
current_file_path = request_data[ 'filepath' ]
client_data = request_data.get( 'extra_conf_data', None )
quoted_include_paths, include_paths = (
self._flags.UserIncludePaths( current_file_path, client_data ) )
if quoted_include:
include_file_path = _GetAbsolutePath( include_file_name,
quoted_include_paths )
if include_file_path:
return responses.BuildGoToResponse( include_file_path,
line_num = 1,
column_num = 1 )
include_file_path = _GetAbsolutePath( include_file_name, include_paths )
if include_file_path:
return responses.BuildGoToResponse( include_file_path,
line_num = 1,
column_num = 1 )
raise RuntimeError( 'Include file not found.' )
def _GoToInclude( self, request_data ):
include_response = self._ResponseForInclude( request_data )
if not include_response:
raise RuntimeError( 'Not an include/import line.' )
return include_response
def _GetSemanticInfo(
self,
request_data,
func,
response_builder = responses.BuildDisplayMessageResponse,
reparse = True ):
filename = request_data[ 'filepath' ]
if not filename:
raise ValueError( INVALID_FILE_MESSAGE )
flags = self._FlagsForRequest( request_data )
if not flags:
raise ValueError( NO_COMPILE_FLAGS_MESSAGE )
files = self.GetUnsavedFilesVector( request_data )
line = request_data[ 'line_num' ]
column = request_data[ 'column_num' ]
message = getattr( self._completer, func )(
ToCppStringCompatible( filename ),
line,
column,
files,
flags,
reparse)
if not message:
message = "No semantic information available"
return response_builder( message )
def _ClearCompilationFlagCache( self ):
self._flags.Clear()
def _FixIt( self, request_data ):
filename = request_data[ 'filepath' ]
if not filename:
raise ValueError( INVALID_FILE_MESSAGE )
flags = self._FlagsForRequest( request_data )
if not flags:
raise ValueError( NO_COMPILE_FLAGS_MESSAGE )
files = self.GetUnsavedFilesVector( request_data )
line = request_data[ 'line_num' ]
column = request_data[ 'column_num' ]
fixits = getattr( self._completer, "GetFixItsForLocationInFile" )(
ToCppStringCompatible( filename ),
line,
column,
files,
flags,
True )
# don't raise an error if not fixits: - leave that to the client to respond
# in a nice way
return responses.BuildFixItResponse( fixits )
def OnFileReadyToParse( self, request_data ):
filename = request_data[ 'filepath' ]
if not filename:
raise ValueError( INVALID_FILE_MESSAGE )
flags = self._FlagsForRequest( request_data )
if not flags:
raise ValueError( NO_COMPILE_FLAGS_MESSAGE )
with self._files_being_compiled.GetExclusive( filename ):
diagnostics = self._completer.UpdateTranslationUnit(
ToCppStringCompatible( filename ),
self.GetUnsavedFilesVector( request_data ),
flags )
diagnostics = _FilterDiagnostics( diagnostics )
self._diagnostic_store = DiagnosticsToDiagStructure( diagnostics )
return [ responses.BuildDiagnosticData( x ) for x in
diagnostics[ : self._max_diagnostics_to_display ] ]
def OnBufferUnload( self, request_data ):
self._completer.DeleteCachesForFile(
ToCppStringCompatible( request_data[ 'filepath' ] ) )
def GetDetailedDiagnostic( self, request_data ):
current_line = request_data[ 'line_num' ]
current_column = request_data[ 'column_num' ]
current_file = request_data[ 'filepath' ]
if not self._diagnostic_store:
raise ValueError( NO_DIAGNOSTIC_MESSAGE )
diagnostics = self._diagnostic_store[ current_file ][ current_line ]
if not diagnostics:
raise ValueError( NO_DIAGNOSTIC_MESSAGE )
closest_diagnostic = None
distance_to_closest_diagnostic = 999
# FIXME: all of these calculations are currently working with byte
# offsets, which are technically incorrect. We should be working with
# codepoint offsets, as we want the nearest character-wise diagnostic
for diagnostic in diagnostics:
distance = abs( current_column - diagnostic.location_.column_number_ )
if distance < distance_to_closest_diagnostic:
distance_to_closest_diagnostic = distance
closest_diagnostic = diagnostic
return responses.BuildDisplayMessageResponse(
closest_diagnostic.long_formatted_text_ )
def DebugInfo( self, request_data ):
filename = request_data[ 'filepath' ]
try:
extra_conf = extra_conf_store.ModuleFileForSourceFile( filename )
flags = self._FlagsForRequest( request_data ) or []
except NoExtraConfDetected:
extra_conf = None
except UnknownExtraConf as error:
return ( 'C-family completer debug information:\n'
' Configuration file found but not loaded\n'
' Configuration path: {0}'.format(
error.extra_conf_file ) )
if not extra_conf:
database = self._flags.FindCompilationDatabase(
os.path.dirname( filename ) )
if database is None or not database.DatabaseSuccessfullyLoaded():
return ( 'C-family completer debug information:\n'
' No configuration file found\n'
' No compilation database found\n' )
else:
return ( 'C-family completer debug information:\n'
' No configuration file found\n'
' Using compilation database from: {0}\n'
' Flags: {1}'.format( database.database_directory,
list( flags ) ) )
return ( 'C-family completer debug information:\n'
' Configuration file found and loaded\n'
' Configuration path: {0}\n'
' Flags: {1}'.format( extra_conf, list( flags ) ) )
def _FlagsForRequest( self, request_data ):
filename = request_data[ 'filepath' ]
if 'compilation_flags' in request_data:
return PrepareFlagsForClang( request_data[ 'compilation_flags' ],
filename )
client_data = request_data.get( 'extra_conf_data', None )
return self._flags.FlagsForFile( filename, client_data = client_data )
def ConvertCompletionData( completion_data ):
return responses.BuildCompletionData(
insertion_text = completion_data.TextToInsertInBuffer(),
menu_text = completion_data.MainCompletionText(),
extra_menu_info = completion_data.ExtraMenuInfo(),
kind = completion_data.kind_.name,
detailed_info = completion_data.DetailedInfoForPreviewWindow(),
extra_data = ( { 'doc_string': completion_data.DocString() }
if completion_data.DocString() else None ) )
def DiagnosticsToDiagStructure( diagnostics ):
structure = defaultdict( lambda : defaultdict( list ) )
for diagnostic in diagnostics:
structure[ diagnostic.location_.filename_ ][
diagnostic.location_.line_number_ ].append( diagnostic )
return structure
def ClangAvailableForFiletypes( filetypes ):
return any( [ filetype in CLANG_FILETYPES for filetype in filetypes ] )
def InCFamilyFile( filetypes ):
return ClangAvailableForFiletypes( filetypes )
def _FilterDiagnostics( diagnostics ):
# Clang has an annoying warning that shows up when we try to compile header
# files if the header has "#pragma once" inside it. The error is not
# legitimate because it shows up because libclang thinks we are compiling a
# source file instead of a header file.
#
# See our issue #216 and upstream bug:
# http://llvm.org/bugs/show_bug.cgi?id=16686
#
# The second thing we want to filter out are those incredibly annoying "too
# many errors emitted" diagnostics that are utterly useless.
return [ x for x in diagnostics if
x.text_ != PRAGMA_DIAG_TEXT_TO_IGNORE and
x.text_ != TOO_MANY_ERRORS_DIAG_TEXT_TO_IGNORE ]
def _ResponseForLocation( location ):
return responses.BuildGoToResponse( location.filename_,
location.line_number_,
location.column_number_ )
# Strips the following leading strings from the raw comment:
# - <whitespace>///
# - <whitespace>///<
# - <whitespace>//<
# - <whitespace>//!
# - <whitespace>/**
# - <whitespace>/*!
# - <whitespace>/*<
# - <whitespace>/*
# - <whitespace>*
# - <whitespace>*/
# - etc.
# That is:
# - 2 or 3 '/' followed by '<' or '!'
# - '/' then 1 or 2 '*' followed by optional '<' or '!'
# - '*' followed by optional '/'
STRIP_LEADING_COMMENT = re.compile( '^[ \t]*(/{2,3}[<!]?|/\*{1,2}[<!]?|\*/?)' )
# And the following trailing strings
# - <whitespace>*/
# - <whitespace>
STRIP_TRAILING_COMMENT = re.compile( '[ \t]*\*/[ \t]*$|[ \t]*$' )
def _FormatRawComment( comment ):
"""Strips leading indentation and comment markers from the comment string"""
return textwrap.dedent(
'\n'.join( [ re.sub( STRIP_TRAILING_COMMENT, '',
re.sub( STRIP_LEADING_COMMENT, '', line ) )
for line in ToUnicode( comment ).splitlines() ] ) )
def _BuildGetDocResponse( doc_data ):
"""Builds a "DetailedInfoResponse" for a GetDoc request. doc_data is a
DocumentationData object returned from the ClangCompleter"""
# Parse the XML, as this is the only way to get the declaration text out of
# libclang. It seems quite wasteful, but while the contents of the XML
# provide fully parsed doxygen documentation tree, we actually don't want to
# ever lose any information from the comment, so we just want display
# the stripped comment. Arguably we could skip all of this XML generation and
# parsing, but having the raw declaration text is likely one of the most
# useful pieces of documentation available to the developer. Perhaps in
# future, we can use this XML for more interesting things.
try:
root = xml.etree.ElementTree.fromstring( doc_data.comment_xml )
except:
raise ValueError( NO_DOCUMENTATION_MESSAGE )
# Note: declaration is False-y if it has no child elements, hence the below
# (wordy) if not declaration is None
declaration = root.find( "Declaration" )
return responses.BuildDetailedInfoResponse(
'{0}\n{1}\nType: {2}\nName: {3}\n---\n{4}'.format(
ToUnicode( declaration.text ) if declaration is not None else "",
ToUnicode( doc_data.brief_comment ),
ToUnicode( doc_data.canonical_type ),
ToUnicode( doc_data.display_name ),
ToUnicode( _FormatRawComment( doc_data.raw_comment ) ) ) )
def _GetAbsolutePath( include_file_name, include_paths ):
for path in include_paths:
include_file_path = os.path.join( path, include_file_name )
if os.path.isfile( include_file_path ):
return include_file_path
return None