clang-tools-extra/clangd/Config.h

   1 //===--- Config.h - User configuration of clangd behavior --------*- C++-*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Various clangd features have configurable behaviour (or can be disabled).
  10 // This file defines "resolved" configuration seen by features within clangd.
  11 // For example, settings may vary per-file, the resolved Config only contains
  12 // settings that apply to the current file.
  13 //
  14 // This is distinct from how the config is specified by the user (Fragment)
  15 // interpreted (CompiledFragment), and combined (Provider).
  16 // ConfigFragment.h describes the steps to add a new configuration option.
  17 //
  18 // Because this structure is shared throughout clangd, it's a potential source
  19 // of layering problems. Config should be expressed in terms of simple
  20 // vocabulary types where possible.
  21 //
  22 //===----------------------------------------------------------------------===//
  23
  24 #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_CONFIG_H
  25 #define LLVM_CLANG_TOOLS_EXTRA_CLANGD_CONFIG_H
  26
  27 #include "support/Context.h"
  28 #include "llvm/ADT/FunctionExtras.h"
  29 #include "llvm/ADT/StringMap.h"
  30 #include "llvm/ADT/StringSet.h"
  31 #include <functional>
  32 #include <optional>
  33 #include <string>
  34 #include <vector>
  35
  36 namespace clang {
  37 namespace clangd {
  38
  39 /// Settings that express user/project preferences and control clangd behavior.
  40 ///
  41 /// Generally, features should consume Config::current() and the caller is
  42 /// responsible for setting it appropriately. In practice these callers are
  43 /// ClangdServer, TUScheduler, and BackgroundQueue.
  44 struct Config {
  45   /// Returns the Config of the current Context, or an empty configuration.
  46   static const Config &current();
  47   /// Context key which can be used to set the current Config.
  48   static clangd::Key<Config> Key;
  49
  50   Config() = default;
  51   Config(const Config &) = delete;
  52   Config &operator=(const Config &) = delete;
  53   Config(Config &&) = default;
  54   Config &operator=(Config &&) = default;
  55
  56   struct CDBSearchSpec {
  57     enum { Ancestors, FixedDir, NoCDBSearch } Policy = Ancestors;
  58     // Absolute, native slashes, no trailing slash.
  59     std::optional<std::string> FixedCDBPath;
  60   };
  61
  62   /// Controls how the compile command for the current file is determined.
  63   struct {
  64     /// Edits to apply to the compile command, in sequence.
  65     std::vector<llvm::unique_function<void(std::vector<std::string> &) const>>
  66         Edits;
  67     /// Where to search for compilation databases for this file's flags.
  68     CDBSearchSpec CDBSearch = {CDBSearchSpec::Ancestors, std::nullopt};
  69   } CompileFlags;
  70
  71   enum class BackgroundPolicy { Build, Skip };
  72   /// Describes an external index configuration.
  73   struct ExternalIndexSpec {
  74     enum { None, File, Server } Kind = None;
  75     /// This is one of:
  76     /// - Address of a clangd-index-server, in the form of "ip:port".
  77     /// - Absolute path to an index produced by clangd-indexer.
  78     std::string Location;
  79     /// Absolute path to source root this index is associated with, uses
  80     /// forward-slashes.
  81     std::string MountPoint;
  82   };
  83   /// Controls index behavior.
  84   struct {
  85     /// Whether this TU should be background-indexed.
  86     BackgroundPolicy Background = BackgroundPolicy::Build;
  87     ExternalIndexSpec External;
  88     bool StandardLibrary = true;
  89   } Index;
  90
  91   enum class IncludesPolicy {
  92     /// Diagnose missing and unused includes.
  93     Strict,
  94     None,
  95   };
  96   enum class FastCheckPolicy { Strict, Loose, None };
  97   /// Controls warnings and errors when parsing code.
  98   struct {
  99     bool SuppressAll = false;
 100     llvm::StringSet<> Suppress;
 101
 102     /// Configures what clang-tidy checks to run and options to use with them.
 103     struct {
 104       // A comma-separated list of globs specify which clang-tidy checks to run.
 105       std::string Checks;
 106       llvm::StringMap<std::string> CheckOptions;
 107       FastCheckPolicy FastCheckFilter = FastCheckPolicy::Strict;
 108     } ClangTidy;
 109
 110     IncludesPolicy UnusedIncludes = IncludesPolicy::Strict;
 111     IncludesPolicy MissingIncludes = IncludesPolicy::None;
 112
 113     /// IncludeCleaner will not diagnose usages of these headers matched by
 114     /// these regexes.
 115     struct {
 116       std::vector<std::function<bool(llvm::StringRef)>> IgnoreHeader;
 117     } Includes;
 118   } Diagnostics;
 119
 120   /// Style of the codebase.
 121   struct {
 122     // Namespaces that should always be fully qualified, meaning no "using"
 123     // declarations, always spell out the whole name (with or without leading
 124     // ::). All nested namespaces are affected as well.
 125     std::vector<std::string> FullyQualifiedNamespaces;
 126   } Style;
 127
 128   /// Configures code completion feature.
 129   struct {
 130     /// Whether code completion includes results that are not visible in current
 131     /// scopes.
 132     bool AllScopes = true;
 133   } Completion;
 134
 135   /// Configures hover feature.
 136   struct {
 137     /// Whether hover show a.k.a type.
 138     bool ShowAKA = true;
 139   } Hover;
 140
 141   struct {
 142     /// If false, inlay hints are completely disabled.
 143     bool Enabled = true;
 144
 145     // Whether specific categories of hints are enabled.
 146     bool Parameters = true;
 147     bool DeducedTypes = true;
 148     bool Designators = true;
 149     bool BlockEnd = false;
 150     // Limit the length of type names in inlay hints. (0 means no limit)
 151     uint32_t TypeNameLimit = 32;
 152   } InlayHints;
 153
 154   struct {
 155     /// Controls highlighting kinds that are disabled.
 156     std::vector<std::string> DisabledKinds;
 157     /// Controls highlighting modifiers that are disabled.
 158     std::vector<std::string> DisabledModifiers;
 159   } SemanticTokens;
 160 };
 161
 162 } // namespace clangd
 163 } // namespace clang
 164
 165 namespace llvm {
 166 template <> struct DenseMapInfo<clang::clangd::Config::ExternalIndexSpec> {
 167   using ExternalIndexSpec = clang::clangd::Config::ExternalIndexSpec;
 168   static inline ExternalIndexSpec getEmptyKey() {
 169     return {ExternalIndexSpec::File, "", ""};
 170   }
 171   static inline ExternalIndexSpec getTombstoneKey() {
 172     return {ExternalIndexSpec::File, "TOMB", "STONE"};
 173   }
 174   static unsigned getHashValue(const ExternalIndexSpec &Val) {
 175     return llvm::hash_combine(Val.Kind, Val.Location, Val.MountPoint);
 176   }
 177   static bool isEqual(const ExternalIndexSpec &LHS,
 178                       const ExternalIndexSpec &RHS) {
 179     return std::tie(LHS.Kind, LHS.Location, LHS.MountPoint) ==
 180            std::tie(RHS.Kind, RHS.Location, RHS.MountPoint);
 181   }
 182 };
 183 } // namespace llvm
 184
 185 #endif