contrib/llvm/tools/lldb/source/Interpreter/CommandObjectRegexCommand.cpp

   1 //===-- CommandObjectRegexCommand.cpp ---------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "lldb/Interpreter/CommandObjectRegexCommand.h"
  11
  12 // C Includes
  13 // C++ Includes
  14 // Other libraries and framework includes
  15 // Project includes
  16 #include "lldb/Interpreter/CommandInterpreter.h"
  17 #include "lldb/Interpreter/CommandReturnObject.h"
  18
  19 using namespace lldb;
  20 using namespace lldb_private;
  21
  22 //----------------------------------------------------------------------
  23 // CommandObjectRegexCommand constructor
  24 //----------------------------------------------------------------------
  25 CommandObjectRegexCommand::CommandObjectRegexCommand(
  26     CommandInterpreter &interpreter, llvm::StringRef name, llvm::StringRef help,
  27   llvm::StringRef syntax, uint32_t max_matches, uint32_t completion_type_mask,
  28     bool is_removable)
  29     : CommandObjectRaw(interpreter, name, help, syntax),
  30       m_max_matches(max_matches), m_completion_type_mask(completion_type_mask),
  31       m_entries(), m_is_removable(is_removable) {}
  32
  33 //----------------------------------------------------------------------
  34 // Destructor
  35 //----------------------------------------------------------------------
  36 CommandObjectRegexCommand::~CommandObjectRegexCommand() {}
  37
  38 bool CommandObjectRegexCommand::DoExecute(const char *command,
  39                                           CommandReturnObject &result) {
  40   if (command) {
  41     EntryCollection::const_iterator pos, end = m_entries.end();
  42     for (pos = m_entries.begin(); pos != end; ++pos) {
  43       RegularExpression::Match regex_match(m_max_matches);
  44
  45       if (pos->regex.Execute(command, &regex_match)) {
  46         std::string new_command(pos->command);
  47         std::string match_str;
  48         char percent_var[8];
  49         size_t idx, percent_var_idx;
  50         for (uint32_t match_idx = 1; match_idx <= m_max_matches; ++match_idx) {
  51           if (regex_match.GetMatchAtIndex(command, match_idx, match_str)) {
  52             const int percent_var_len =
  53                 ::snprintf(percent_var, sizeof(percent_var), "%%%u", match_idx);
  54             for (idx = 0; (percent_var_idx = new_command.find(
  55                                percent_var, idx)) != std::string::npos;) {
  56               new_command.erase(percent_var_idx, percent_var_len);
  57               new_command.insert(percent_var_idx, match_str);
  58               idx += percent_var_idx + match_str.size();
  59             }
  60           }
  61         }
  62         // Interpret the new command and return this as the result!
  63         if (m_interpreter.GetExpandRegexAliases())
  64           result.GetOutputStream().Printf("%s\n", new_command.c_str());
  65         // Pass in true for "no context switching".  The command that called us
  66         // should have set up the context
  67         // appropriately, we shouldn't have to redo that.
  68         return m_interpreter.HandleCommand(new_command.c_str(),
  69                                            eLazyBoolCalculate, result, nullptr,
  70                                            true, true);
  71       }
  72     }
  73     result.SetStatus(eReturnStatusFailed);
  74     if (!GetSyntax().empty())
  75       result.AppendError(GetSyntax());
  76     else
  77       result.AppendErrorWithFormat("Command contents '%s' failed to match any "
  78                                    "regular expression in the '%s' regex "
  79                                    "command.\n",
  80                                    command, m_cmd_name.c_str());
  81     return false;
  82   }
  83   result.AppendError("empty command passed to regular expression command");
  84   result.SetStatus(eReturnStatusFailed);
  85   return false;
  86 }
  87
  88 bool CommandObjectRegexCommand::AddRegexCommand(const char *re_cstr,
  89                                                 const char *command_cstr) {
  90   m_entries.resize(m_entries.size() + 1);
  91   // Only add the regular expression if it compiles
  92   if (m_entries.back().regex.Compile(
  93           llvm::StringRef::withNullAsEmpty(re_cstr))) {
  94     m_entries.back().command.assign(command_cstr);
  95     return true;
  96   }
  97   // The regex didn't compile...
  98   m_entries.pop_back();
  99   return false;
 100 }
 101
 102 int CommandObjectRegexCommand::HandleCompletion(Args &input, int &cursor_index,
 103                                                 int &cursor_char_position,
 104                                                 int match_start_point,
 105                                                 int max_return_elements,
 106                                                 bool &word_complete,
 107                                                 StringList &matches) {
 108   if (m_completion_type_mask) {
 109     std::string completion_str(input.GetArgumentAtIndex(cursor_index),
 110                                cursor_char_position);
 111     CommandCompletions::InvokeCommonCompletionCallbacks(
 112         GetCommandInterpreter(), m_completion_type_mask, completion_str.c_str(),
 113         match_start_point, max_return_elements, nullptr, word_complete,
 114         matches);
 115     return matches.GetSize();
 116   } else {
 117     matches.Clear();
 118     word_complete = false;
 119   }
 120   return 0;
 121 }