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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/>.
#include "IdentifierUtils.h"
#include "Utils.h"
#include <array>
#include <filesystem>
#include <functional>
#include <string_view>
#include <utility>
namespace YouCompleteMe {
namespace fs = std::filesystem;
namespace {
// List of languages Universal Ctags supports:
// ctags --list-languages
// To map a language name to a filetype, see this file:
// :e $VIMRUNTIME/filetype.vim
using namespace std::literals;
constexpr std::array LANG_TO_FILETYPE = {
std::pair{ "C#"sv , "cs"sv },
std::pair{ "C++"sv , "cpp"sv },
std::pair{ "gdbinit"sv , "gdb"sv },
std::pair{ "JavaProperties"sv , "jproperties"sv },
std::pair{ "ObjectiveC"sv , "objc"sv },
std::pair{ "PuppetManifest"sv , "puppet"sv },
std::pair{ "RelaxNG"sv , "rng"sv },
std::pair{ "reStructuredText"sv , "rst"sv },
std::pair{ "RpmSpec"sv , "spec"sv },
std::pair{ "SystemdUnit"sv , "systemd"sv },
};
} // unnamed namespace
// For details on the tag format supported, see here for details:
// http://ctags.sourceforge.net/FORMAT
// TL;DR: The only supported format is the one Exuberant Ctags emits.
FiletypeIdentifierMap ExtractIdentifiersFromTagsFile(
const fs::path &path_to_tag_file ) {
FiletypeIdentifierMap filetype_identifier_map;
const auto lines = [ &path_to_tag_file ]{
try {
return ReadUtf8File( path_to_tag_file );
} catch ( ... ) {
return std::vector< std::string >{};
}
}();
for ( auto&& line : lines ) {
// Identifier name is from the start of the line to the first \t.
const auto id_end = std::find( line.cbegin(), line.cend(), '\t' );
if ( id_end == line.cend() ) {
continue;
}
// File path the identifier is in is the second field.
const auto path_begin = std::find_if( id_end + 1, line.cend(), [](char c) {
return c != '\t';
} );
if ( path_begin == line.cend() ) {
continue;
}
const auto path_end = std::find( path_begin + 1, line.cend(), '\t' );
if ( path_end == line.cend() ) {
continue;
}
// IdentifierCompleter depends on the "language:Foo" field.
const std::string_view lang_str = "language:";
auto searcher = std::default_searcher( lang_str.cbegin(), lang_str.cend() );
const auto lang_begin = searcher( path_end + 1, line.cend() ).second;
if ( lang_begin == line.cend() ) {
continue;
}
const auto lang_end = [ &line, lang_begin ] {
auto end = std::find( lang_begin + 1, line.cend(), '\t' );
if (end == line.cend() ) {
end = line.back() == '\r' ? line.cend() - 1 : line.cend();
}
return end;
}();
std::string_view identifier( line.data(), id_end - line.cbegin() );
fs::path path( path_begin, path_end );
path = fs::weakly_canonical( path_to_tag_file.parent_path() / path );
std::string_view language( &*lang_begin, lang_end - lang_begin );
std::string filetype( FindWithDefault( LANG_TO_FILETYPE,
language,
Lowercase( language ) ) );
filetype_identifier_map[ std::move( filetype ) ]
[ std::move( path ).string() ]
.emplace_back( identifier );
}
return filetype_identifier_map;
}
} // namespace YouCompleteMe
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