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      1 // Copyright (c) 2012 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 #include "chromeos/system/name_value_pairs_parser.h"
      6 
      7 #include "base/command_line.h"
      8 #include "base/file_util.h"
      9 #include "base/files/file_path.h"
     10 #include "base/logging.h"
     11 #include "base/process/launch.h"
     12 #include "base/stl_util.h"
     13 #include "base/strings/string_tokenizer.h"
     14 #include "base/strings/string_util.h"
     15 
     16 namespace chromeos {  // NOLINT
     17 namespace system {
     18 
     19 namespace {
     20 
     21 const char kQuoteChars[] = "\"";
     22 const char kTrimChars[] = "\" ";
     23 
     24 bool GetToolOutput(int argc, const char* argv[], std::string& output) {
     25   DCHECK_GE(argc, 1);
     26 
     27   if (!base::PathExists(base::FilePath(argv[0]))) {
     28     LOG(WARNING) << "Tool for statistics not found: " << argv[0];
     29     return false;
     30   }
     31 
     32   std::vector<std::string> args;
     33   for (int argn = 0; argn < argc; ++argn)
     34     args.push_back(argv[argn]);
     35   if (!base::GetAppOutput(args, &output)) {
     36     LOG(WARNING) << "Error executing " << argv[0];
     37     return false;
     38   }
     39 
     40   return true;
     41 }
     42 
     43 }  // namespace
     44 
     45 NameValuePairsParser::NameValuePairsParser(NameValueMap* map)
     46     : map_(map) {
     47 }
     48 
     49 void NameValuePairsParser::AddNameValuePair(const std::string& key,
     50                                             const std::string& value) {
     51   if (!ContainsKey(*map_, key)) {
     52     (*map_)[key] = value;
     53     VLOG(1) << "name: " << key << ", value: " << value;
     54   } else {
     55     LOG(WARNING) << "Key " << key << " already has value " << (*map_)[key]
     56                  << ", ignoring new value: " << value;
     57   }
     58 }
     59 
     60 bool NameValuePairsParser::ParseNameValuePairs(const std::string& in_string,
     61                                                const std::string& eq,
     62                                                const std::string& delim) {
     63   return ParseNameValuePairsWithComments(in_string, eq, delim, "");
     64 }
     65 
     66 bool NameValuePairsParser::ParseNameValuePairsWithComments(
     67     const std::string& in_string,
     68     const std::string& eq,
     69     const std::string& delim,
     70     const std::string& comment_delim) {
     71   bool all_valid = true;
     72   // Set up the pair tokenizer.
     73   base::StringTokenizer pair_toks(in_string, delim);
     74   pair_toks.set_quote_chars(kQuoteChars);
     75   // Process token pairs.
     76   while (pair_toks.GetNext()) {
     77     std::string pair(pair_toks.token());
     78     // Anything before the first |eq| is the key, anything after is the value.
     79     // |eq| must exist.
     80     size_t eq_pos = pair.find(eq);
     81     if (eq_pos != std::string::npos) {
     82       // First |comment_delim| after |eq_pos| starts the comment.
     83       // A value of |std::string::npos| means that the value spans to the end
     84       // of |pair|.
     85       size_t value_size = std::string::npos;
     86       if (!comment_delim.empty()) {
     87         size_t comment_pos = pair.find(comment_delim, eq_pos + 1);
     88         if (comment_pos != std::string::npos)
     89           value_size = comment_pos - eq_pos - 1;
     90       }
     91 
     92       std::string key;
     93       std::string value;
     94       TrimString(pair.substr(0, eq_pos), kTrimChars, &key);
     95       TrimString(pair.substr(eq_pos + 1, value_size), kTrimChars, &value);
     96 
     97       if (!key.empty()) {
     98         AddNameValuePair(key, value);
     99         continue;
    100       }
    101     }
    102 
    103     LOG(WARNING) << "Invalid token pair: " << pair << ". Ignoring.";
    104     all_valid = false;
    105   }
    106   return all_valid;
    107 }
    108 
    109 bool NameValuePairsParser::GetSingleValueFromTool(int argc,
    110                                                   const char* argv[],
    111                                                   const std::string& key) {
    112   std::string output_string;
    113   if (!GetToolOutput(argc, argv, output_string))
    114     return false;
    115 
    116   TrimWhitespaceASCII(output_string, TRIM_ALL, &output_string);
    117   AddNameValuePair(key, output_string);
    118   return true;
    119 }
    120 
    121 bool NameValuePairsParser::GetNameValuePairsFromFile(
    122     const base::FilePath& file_path,
    123     const std::string& eq,
    124     const std::string& delim) {
    125   std::string contents;
    126   if (file_util::ReadFileToString(file_path, &contents)) {
    127     return ParseNameValuePairs(contents, eq, delim);
    128   } else {
    129     LOG(WARNING) << "Unable to read statistics file: " << file_path.value();
    130     return false;
    131   }
    132 }
    133 
    134 bool NameValuePairsParser::ParseNameValuePairsFromTool(
    135     int argc,
    136     const char* argv[],
    137     const std::string& eq,
    138     const std::string& delim,
    139     const std::string& comment_delim) {
    140   std::string output_string;
    141   if (!GetToolOutput(argc, argv, output_string))
    142     return false;
    143 
    144   return ParseNameValuePairsWithComments(
    145       output_string, eq, delim, comment_delim);
    146 }
    147 
    148 }  // namespace system
    149 }  // namespace chromeos
    150