1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_VLOG_H_ 6 #define BASE_VLOG_H_ 7 8 #include <cstddef> 9 #include <string> 10 #include <vector> 11 12 #include "base/base_export.h" 13 #include "base/basictypes.h" 14 #include "base/strings/string_piece.h" 15 16 namespace logging { 17 18 // A helper class containing all the settings for vlogging. 19 class BASE_EXPORT VlogInfo { 20 public: 21 static const int kDefaultVlogLevel; 22 23 // |v_switch| gives the default maximal active V-logging level; 0 is 24 // the default. Normally positive values are used for V-logging 25 // levels. 26 // 27 // |vmodule_switch| gives the per-module maximal V-logging levels to 28 // override the value given by |v_switch|. 29 // E.g. "my_module=2,foo*=3" would change the logging level for all 30 // code in source files "my_module.*" and "foo*.*" ("-inl" suffixes 31 // are also disregarded for this matching). 32 // 33 // |log_severity| points to an int that stores the log level. If a valid 34 // |v_switch| is provided, it will set the log level, and the default 35 // vlog severity will be read from there.. 36 // 37 // Any pattern containing a forward or backward slash will be tested 38 // against the whole pathname and not just the module. E.g., 39 // "*/foo/bar/*=2" would change the logging level for all code in 40 // source files under a "foo/bar" directory. 41 VlogInfo(const std::string& v_switch, 42 const std::string& vmodule_switch, 43 int* min_log_level); 44 ~VlogInfo(); 45 46 // Returns the vlog level for a given file (usually taken from 47 // __FILE__). 48 int GetVlogLevel(const base::StringPiece& file) const; 49 50 private: 51 void SetMaxVlogLevel(int level); 52 int GetMaxVlogLevel() const; 53 54 // VmodulePattern holds all the information for each pattern parsed 55 // from |vmodule_switch|. 56 struct VmodulePattern; 57 std::vector<VmodulePattern> vmodule_levels_; 58 int* min_log_level_; 59 60 DISALLOW_COPY_AND_ASSIGN(VlogInfo); 61 }; 62 63 // Returns true if the string passed in matches the vlog pattern. The 64 // vlog pattern string can contain wildcards like * and ?. ? matches 65 // exactly one character while * matches 0 or more characters. Also, 66 // as a special case, a / or \ character matches either / or \. 67 // 68 // Examples: 69 // "kh?n" matches "khan" but not "khn" or "khaan" 70 // "kh*n" matches "khn", "khan", or even "khaaaaan" 71 // "/foo\bar" matches "/foo/bar", "\foo\bar", or "/foo\bar" 72 // (disregarding C escaping rules) 73 BASE_EXPORT bool MatchVlogPattern(const base::StringPiece& string, 74 const base::StringPiece& vlog_pattern); 75 76 } // namespace logging 77 78 #endif // BASE_VLOG_H_ 79
