xpcom/base/NSPRLogModulesParser.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "NSPRLogModulesParser.h"
   8
   9 #include "mozilla/Tokenizer.h"
  10
  11 const char kDelimiters[] = ", ";
  12 const char kAdditionalWordChars[] = "_-.*";
  13
  14 namespace mozilla {
  15
  16 void NSPRLogModulesParser(
  17     const char* aLogModules,
  18     const std::function<void(const char*, LogLevel, int32_t)>& aCallback) {
  19   if (!aLogModules) {
  20     return;
  21   }
  22
  23   Tokenizer parser(aLogModules, kDelimiters, kAdditionalWordChars);
  24   nsAutoCString moduleName;
  25
  26   Tokenizer::Token rustModSep =
  27       parser.AddCustomToken("::", Tokenizer::CASE_SENSITIVE);
  28
  29   auto readModuleName = [&](nsAutoCString& moduleName) -> bool {
  30     moduleName.Truncate();
  31     nsDependentCSubstring sub;
  32     parser.Record();
  33     // If the name doesn't include at least one word, we've reached the end.
  34     if (!parser.ReadWord(sub)) {
  35       return false;
  36     }
  37     // We will exit this loop if when any of the condition fails
  38     while (parser.Check(rustModSep) && parser.ReadWord(sub)) {
  39     }
  40     // Claim will include characters of the last sucessfully read item
  41     parser.Claim(moduleName, Tokenizer::INCLUDE_LAST);
  42     return true;
  43   };
  44
  45   // Format: LOG_MODULES="Foo:2,Bar, Baz:5,rust_crate::mod::file:5"
  46   while (readModuleName(moduleName)) {
  47     // Next should be :<level>, default to Error if not provided.
  48     LogLevel logLevel = LogLevel::Error;
  49     int32_t levelValue = 0;
  50     if (parser.CheckChar(':')) {
  51       // NB: If a level isn't provided after the ':' we assume the default
  52       //     Error level is desired. This differs from NSPR which will stop
  53       //     processing the log module string in this case.
  54       if (parser.ReadSignedInteger(&levelValue)) {
  55         logLevel = ToLogLevel(levelValue);
  56       }
  57     }
  58
  59     aCallback(moduleName.get(), logLevel, levelValue);
  60
  61     // Skip ahead to the next token.
  62     parser.SkipWhites();
  63   }
  64 }
  65
  66 }  // namespace mozilla