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      1 // Copyright (c) 2014 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 "base/debug/trace_event_argument.h"
      6 
      7 #include "base/json/json_writer.h"
      8 #include "base/values.h"
      9 
     10 namespace base {
     11 namespace debug {
     12 
     13 TracedValue::TracedValue() : root_(new DictionaryValue()) {
     14   stack_.push_back(root_.get());
     15 }
     16 
     17 TracedValue::~TracedValue() {
     18   DCHECK_EQ(1u, stack_.size());
     19 }
     20 
     21 void TracedValue::SetInteger(const char* name, int value) {
     22   GetCurrentDictionary()->SetInteger(name, value);
     23 }
     24 
     25 void TracedValue::SetDouble(const char* name, double value) {
     26   GetCurrentDictionary()->SetDouble(name, value);
     27 }
     28 
     29 void TracedValue::SetBoolean(const char* name, bool value) {
     30   GetCurrentDictionary()->SetBoolean(name, value);
     31 }
     32 
     33 void TracedValue::SetString(const char* name, const std::string& value) {
     34   GetCurrentDictionary()->SetString(name, value);
     35 }
     36 
     37 void TracedValue::SetValue(const char* name, Value* value) {
     38   GetCurrentDictionary()->Set(name, value);
     39 }
     40 
     41 void TracedValue::BeginDictionary(const char* name) {
     42   DictionaryValue* dictionary = new DictionaryValue();
     43   GetCurrentDictionary()->Set(name, dictionary);
     44   stack_.push_back(dictionary);
     45 }
     46 
     47 void TracedValue::BeginArray(const char* name) {
     48   ListValue* array = new ListValue();
     49   GetCurrentDictionary()->Set(name, array);
     50   stack_.push_back(array);
     51 }
     52 
     53 void TracedValue::EndDictionary() {
     54   DCHECK_GT(stack_.size(), 1u);
     55   DCHECK(GetCurrentDictionary());
     56   stack_.pop_back();
     57 }
     58 
     59 void TracedValue::AppendInteger(int value) {
     60   GetCurrentArray()->AppendInteger(value);
     61 }
     62 
     63 void TracedValue::AppendDouble(double value) {
     64   GetCurrentArray()->AppendDouble(value);
     65 }
     66 
     67 void TracedValue::AppendBoolean(bool value) {
     68   GetCurrentArray()->AppendBoolean(value);
     69 }
     70 
     71 void TracedValue::AppendString(const std::string& value) {
     72   GetCurrentArray()->AppendString(value);
     73 }
     74 
     75 void TracedValue::BeginArray() {
     76   ListValue* array = new ListValue();
     77   GetCurrentArray()->Append(array);
     78   stack_.push_back(array);
     79 }
     80 
     81 void TracedValue::BeginDictionary() {
     82   DictionaryValue* dictionary = new DictionaryValue();
     83   GetCurrentArray()->Append(dictionary);
     84   stack_.push_back(dictionary);
     85 }
     86 
     87 void TracedValue::EndArray() {
     88   DCHECK_GT(stack_.size(), 1u);
     89   DCHECK(GetCurrentArray());
     90   stack_.pop_back();
     91 }
     92 
     93 DictionaryValue* TracedValue::GetCurrentDictionary() {
     94   DCHECK(!stack_.empty());
     95   DictionaryValue* dictionary = NULL;
     96   stack_.back()->GetAsDictionary(&dictionary);
     97   DCHECK(dictionary);
     98   return dictionary;
     99 }
    100 
    101 ListValue* TracedValue::GetCurrentArray() {
    102   DCHECK(!stack_.empty());
    103   ListValue* list = NULL;
    104   stack_.back()->GetAsList(&list);
    105   DCHECK(list);
    106   return list;
    107 }
    108 
    109 void TracedValue::AppendAsTraceFormat(std::string* out) const {
    110   std::string tmp;
    111   JSONWriter::Write(stack_.front(), &tmp);
    112   *out += tmp;
    113   DCHECK_EQ(1u, stack_.size()) << tmp;
    114 }
    115 
    116 }  // namespace debug
    117 }  // namespace base
    118