//===-- CommandCompletions.h ------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef lldb_CommandCompletions_h_
#define lldb_CommandCompletions_h_

#include <set>

#include "lldb/Core/FileSpecList.h"
#include "lldb/Core/SearchFilter.h"
#include "lldb/Utility/CompletionRequest.h"
#include "lldb/Utility/RegularExpression.h"
#include "lldb/lldb-private.h"

#include "llvm/ADT/Twine.h"

namespace lldb_private {
class TildeExpressionResolver;
class CommandCompletions {
public:
  // This is the command completion callback that is used to complete the
  // argument of the option it is bound to (in the OptionDefinition table
  // below).  Return the total number of matches.
  typedef int (*CompletionCallback)(CommandInterpreter &interpreter,
                                    CompletionRequest &request,
                                    // A search filter to limit the search...
                                    lldb_private::SearchFilter *searcher);
  enum CommonCompletionTypes {
    eNoCompletion = 0u,
    eSourceFileCompletion = (1u << 0),
    eDiskFileCompletion = (1u << 1),
    eDiskDirectoryCompletion = (1u << 2),
    eSymbolCompletion = (1u << 3),
    eModuleCompletion = (1u << 4),
    eSettingsNameCompletion = (1u << 5),
    ePlatformPluginCompletion = (1u << 6),
    eArchitectureCompletion = (1u << 7),
    eVariablePathCompletion = (1u << 8),
    // This item serves two purposes.  It is the last element in the enum, so
    // you can add custom enums starting from here in your Option class. Also
    // if you & in this bit the base code will not process the option.
    eCustomCompletion = (1u << 9)
  };

  struct CommonCompletionElement {
    uint32_t type;
    CompletionCallback callback;
  };

  static bool InvokeCommonCompletionCallbacks(
      CommandInterpreter &interpreter, uint32_t completion_mask,
      lldb_private::CompletionRequest &request, SearchFilter *searcher);

  // These are the generic completer functions:
  static int DiskFiles(CommandInterpreter &interpreter,
                       CompletionRequest &request, SearchFilter *searcher);

  static int DiskFiles(const llvm::Twine &partial_file_name,
                       StringList &matches, TildeExpressionResolver &Resolver);

  static int DiskDirectories(CommandInterpreter &interpreter,
                             CompletionRequest &request,
                             SearchFilter *searcher);

  static int DiskDirectories(const llvm::Twine &partial_file_name,
                             StringList &matches,
                             TildeExpressionResolver &Resolver);

  static int SourceFiles(CommandInterpreter &interpreter,
                         CompletionRequest &request, SearchFilter *searcher);

  static int Modules(CommandInterpreter &interpreter,
                     CompletionRequest &request, SearchFilter *searcher);

  static int Symbols(CommandInterpreter &interpreter,
                     CompletionRequest &request, SearchFilter *searcher);

  static int SettingsNames(CommandInterpreter &interpreter,
                           CompletionRequest &request, SearchFilter *searcher);

  static int PlatformPluginNames(CommandInterpreter &interpreter,
                                 CompletionRequest &request,
                                 SearchFilter *searcher);

  static int ArchitectureNames(CommandInterpreter &interpreter,
                               CompletionRequest &request,
                               SearchFilter *searcher);

  static int VariablePath(CommandInterpreter &interpreter,
                          CompletionRequest &request, SearchFilter *searcher);

  // The Completer class is a convenient base class for building searchers that
  // go along with the SearchFilter passed to the standard Completer functions.
  class Completer : public Searcher {
  public:
    Completer(CommandInterpreter &interpreter, CompletionRequest &request);

    ~Completer() override;

    CallbackReturn SearchCallback(SearchFilter &filter, SymbolContext &context,
                                  Address *addr, bool complete) override = 0;

    lldb::SearchDepth GetDepth() override = 0;

    virtual size_t DoCompletion(SearchFilter *filter) = 0;

  protected:
    CommandInterpreter &m_interpreter;
    CompletionRequest &m_request;

  private:
    DISALLOW_COPY_AND_ASSIGN(Completer);
  };

  // SourceFileCompleter implements the source file completer
  class SourceFileCompleter : public Completer {
  public:
    SourceFileCompleter(CommandInterpreter &interpreter,
                        bool include_support_files, CompletionRequest &request);

    lldb::SearchDepth GetDepth() override;

    Searcher::CallbackReturn SearchCallback(SearchFilter &filter,
                                            SymbolContext &context,
                                            Address *addr,
                                            bool complete) override;

    size_t DoCompletion(SearchFilter *filter) override;

  private:
    bool m_include_support_files;
    FileSpecList m_matching_files;
    const char *m_file_name;
    const char *m_dir_name;

    DISALLOW_COPY_AND_ASSIGN(SourceFileCompleter);
  };

  // ModuleCompleter implements the module completer
  class ModuleCompleter : public Completer {
  public:
    ModuleCompleter(CommandInterpreter &interpreter,
                    CompletionRequest &request);

    lldb::SearchDepth GetDepth() override;

    Searcher::CallbackReturn SearchCallback(SearchFilter &filter,
                                            SymbolContext &context,
                                            Address *addr,
                                            bool complete) override;

    size_t DoCompletion(SearchFilter *filter) override;

  private:
    const char *m_file_name;
    const char *m_dir_name;

    DISALLOW_COPY_AND_ASSIGN(ModuleCompleter);
  };

  // SymbolCompleter implements the symbol completer
  class SymbolCompleter : public Completer {
  public:
    SymbolCompleter(CommandInterpreter &interpreter,
                    CompletionRequest &request);

    lldb::SearchDepth GetDepth() override;

    Searcher::CallbackReturn SearchCallback(SearchFilter &filter,
                                            SymbolContext &context,
                                            Address *addr,
                                            bool complete) override;

    size_t DoCompletion(SearchFilter *filter) override;

  private:
    RegularExpression m_regex;
    typedef std::set<ConstString> collection;
    collection m_match_set;

    DISALLOW_COPY_AND_ASSIGN(SymbolCompleter);
  };

private:
  static CommonCompletionElement g_common_completions[];
};

} // namespace lldb_private

#endif // lldb_CommandCompletions_h_
