[lldb][NFC] Move all completer subclasses into source file

They are all implementation details so let's keep them out of the interface.
Also makes this code more readable by keeping these small classes
not spread over header and source file.

Author: Teemperor

lldb/include/lldb/Interpreter/CommandCompletions.h

@@ -94,94 +94,6 @@ class CommandCompletions {
   static void 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) override = 0;
-
-    lldb::SearchDepth GetDepth() override = 0;
-
-    virtual void 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,
-                        CompletionRequest &request);
-
-    lldb::SearchDepth GetDepth() override;
-
-    Searcher::CallbackReturn SearchCallback(SearchFilter &filter,
-                                            SymbolContext &context,
-                                            Address *addr) override;
-
-    void DoCompletion(SearchFilter *filter) override;
-
-  private:
-    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) override;
-
-    void 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) override;
-
-    void 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[];
 };