src/apps/text_search/Grepper.h

   1 /*
   2  * Copyright (c) 1998-2007 Matthijs Hollemans
   3  * All rights reserved. Distributed under the terms of the MIT License.
   4  */
   5 #ifndef GREPPER_H
   6 #define GREPPER_H
   7
   8 #include <Messenger.h>
   9
  10 class FileIterator;
  11 class Model;
  12
  13 // Executes "grep" in a background thread.
  14 class Grepper {
  15 public:
  16                                                                 Grepper(const char* pattern, const Model* model,
  17                                                                         const BHandler* target,
  18                                                                         FileIterator* iterator);
  19         virtual                                         ~Grepper();
  20
  21                         bool                            IsValid() const;
  22
  23                         void                            Start();
  24                         void                            Cancel();
  25
  26 private:
  27         // Spawns the real grepper threads.
  28         static  int32                           _SpawnRunnerThread(void* cookie);
  29         static  int32                           _SpawnWriterThread(void* cookie);
  30
  31         // The threads functions that does the actual grepping.
  32                         int32                           _RunnerThread();
  33                         int32                           _WriterThread();
  34
  35         // Remembers, and possibly escapes, the search pattern.
  36                         void                            _SetPattern(const char* source);
  37
  38         // Prepends all quotes, dollars and backslashes with at backslash
  39         // to prevent the shell from misinterpreting them.
  40                         bool                            _EscapeSpecialChars(char* buffer,
  41                                                                         ssize_t bufferSize);
  42
  43         private:
  44         // The (escaped) search pattern.
  45                         char*                           fPattern;
  46
  47         // The settings from the model.
  48                         BMessenger                      fTarget;
  49                         bool                            fRegularExpression : 1;
  50                         bool                            fCaseSensitive : 1;
  51                         uint32                          fEncoding;
  52
  53         // The supplier of files to grep
  54                         FileIterator*           fIterator;
  55
  56         // Our thread's ID.
  57                         thread_id                       fRunnerThreadId;
  58         // xargs input pipe
  59                         int                                     fXargsInput;
  60
  61         // Whether our thread must quit.
  62         volatile bool                           fMustQuit;
  63 };
  64
  65 #endif // GREPPER_H