forked from OSchip/llvm-project
102 lines
4.2 KiB
C++
102 lines
4.2 KiB
C++
//===--- ConfigProvider.h - Loading of user configuration --------*- C++-*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Various clangd features have configurable behaviour (or can be disabled).
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// The configuration system allows users to control this:
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// - in a user config file, a project config file, via LSP, or via flags
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// - specifying different settings for different files
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// This file defines the structures used for this, that produce a Config.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_CONFIGPROVIDER_H
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#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_CONFIGPROVIDER_H
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#include "llvm/ADT/FunctionExtras.h"
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#include "llvm/Support/SMLoc.h"
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#include "llvm/Support/SourceMgr.h"
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#include <chrono>
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#include <string>
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#include <vector>
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namespace clang {
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namespace clangd {
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struct Config;
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class ThreadsafeFS;
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namespace config {
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/// Describes the context used to evaluate configuration fragments.
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struct Params {
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/// Absolute path to a source file we're applying the config to. Unix slashes.
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/// Empty if not configuring a particular file.
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llvm::StringRef Path;
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/// Hint that stale data is OK to improve performance (e.g. avoid IO).
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/// FreshTime sets a bound for how old the data can be.
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/// If not set, providers should validate caches against the data source.
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llvm::Optional<std::chrono::steady_clock::time_point> FreshTime;
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};
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/// Used to report problems in parsing or interpreting a config.
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/// Errors reflect structurally invalid config that should be user-visible.
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/// Warnings reflect e.g. unknown properties that are recoverable.
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using DiagnosticCallback = llvm::function_ref<void(const llvm::SMDiagnostic &)>;
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/// A chunk of configuration that has been fully analyzed and is ready to apply.
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/// Typically this is obtained from a Fragment by calling Fragment::compile().
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///
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/// Calling it updates the configuration to reflect settings from the fragment.
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/// Returns true if the condition was met and the settings were used.
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using CompiledFragment = std::function<bool(const Params &, Config &)>;
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/// A source of configuration fragments.
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/// Generally these providers reflect a fixed policy for obtaining config,
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/// but return different concrete configuration over time.
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/// e.g. a provider that reads config from files is responsive to file changes.
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class Provider {
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public:
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virtual ~Provider() = default;
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// Reads fragments from a single YAML file with a fixed path.
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static std::unique_ptr<Provider> fromYAMLFile(llvm::StringRef AbsPathPath,
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const ThreadsafeFS &);
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// Reads fragments from YAML files found relative to ancestors of Params.Path.
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//
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// All fragments that exist are returned, starting from distant ancestors.
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// For instance, given RelPath of ".clangd", then for source file /foo/bar.cc,
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// the searched fragments are [/.clangd, /foo/.clangd].
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//
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// If Params does not specify a path, no fragments are returned.
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static std::unique_ptr<Provider>
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fromAncestorRelativeYAMLFiles(llvm::StringRef RelPath, const ThreadsafeFS &);
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/// A provider that includes fragments from all the supplied providers.
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/// Order is preserved; later providers take precedence over earlier ones.
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static std::unique_ptr<Provider> combine(std::vector<const Provider *>);
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/// Build a config based on this provider.
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Config getConfig(const Params &, DiagnosticCallback) const;
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private:
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/// Provide fragments that may be relevant to the file.
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/// The configuration provider is not responsible for testing conditions.
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///
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/// Providers are expected to cache compiled fragments, and only
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/// reparse/recompile when the source data has changed.
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/// Despite the need for caching, this function must be threadsafe.
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///
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/// When parsing/compiling, the DiagnosticCallback is used to report errors.
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virtual std::vector<CompiledFragment>
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getFragments(const Params &, DiagnosticCallback) const = 0;
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};
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} // namespace config
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} // namespace clangd
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} // namespace clang
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#endif
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