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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/load_log_util.h"
#include "base/string_util.h"
namespace net {
namespace {
class FormatHelper {
public:
std::string ToString(const LoadLog* log) {
entries_.clear();
// Pass 1: Match the start/end of indentation blocks. Fills |entries_|
// with the results.
PopulateEntries(log);
// Pass 2: Figure out the maximum width of each column. This allows us
// to right-justify text within each column.
size_t max_time_width, max_indentation, max_type_width, max_dt_width;
GetMaxExtent(
&max_time_width, &max_indentation, &max_type_width, &max_dt_width);
// Pass 3: Assemble the string.
std::string result;
const int kSpacesPerIndentation = 2;
for (size_t i = 0; i < entries_.size(); ++i) {
if (i > 0)
result += "\n";
int indentation_spaces = entries_[i].indentation * kSpacesPerIndentation;
std::string event_str = GetEventString(i);
result += StringPrintf("t=%s: %s%s",
PadStringLeft(GetTimeString(i), max_time_width).c_str(),
PadStringLeft("", indentation_spaces).c_str(),
event_str.c_str());
if (entries_[i].event->phase == LoadLog::PHASE_BEGIN) {
// Summarize how long this block lasted.
int padding = ((max_indentation - entries_[i].indentation) *
kSpacesPerIndentation) + (max_type_width - event_str.size());
result += StringPrintf("%s [dt=%s]",
PadStringLeft("", padding).c_str(),
PadStringLeft(GetBlockDtString(i), max_dt_width).c_str());
}
}
return result;
}
private:
struct Entry {
explicit Entry(const LoadLog::Event* event)
: event(event), indentation(0), block_index(-1) {}
const LoadLog::Event* event;
size_t indentation;
int block_index; // The index of the matching start / end of block.
};
void PopulateEntries(const LoadLog* log) {
int current_indentation = 0;
for (size_t i = 0; i < log->events().size(); ++i) {
Entry entry(&log->events()[i]);
entry.indentation = current_indentation;
if (entry.event->phase == LoadLog::PHASE_BEGIN) {
// Indent everything contained in this block.
current_indentation++;
}
if (entry.event->phase == LoadLog::PHASE_END) {
int start_index = FindStartOfBlockIndex(entry);
if (start_index != -1) {
// Point the start / end of block at each other.
entry.block_index = start_index;
entries_[start_index].block_index = i;
// Restore the indentation prior to the block.
// (Could be more than 1 level if close of blocks are missing).
current_indentation = entries_[start_index].indentation;
entry.indentation = current_indentation;
}
}
entries_.push_back(entry);
}
}
int FindStartOfBlockIndex(const Entry& entry) {
DCHECK_EQ(LoadLog::PHASE_END, entry.event->phase);
// Find the matching start of block by scanning backwards.
for (int i = entries_.size() - 1; i >= 0; --i) {
if (entries_[i].event->phase == LoadLog::PHASE_BEGIN &&
entries_[i].event->type == entry.event->type) {
return i;
}
}
return -1; // Start not found.
}
void GetMaxExtent(size_t* max_time_width,
size_t* max_indentation,
size_t* max_type_width,
size_t* max_dt_width) {
*max_time_width = *max_indentation = *max_type_width = *max_dt_width = 0;
for (size_t i = 0; i < entries_.size(); ++i) {
*max_time_width = std::max(*max_time_width, GetTimeString(i).size());
*max_type_width = std::max(*max_type_width, GetEventString(i).size());
*max_indentation = std::max(*max_indentation, entries_[i].indentation);
if (entries_[i].event->phase == LoadLog::PHASE_BEGIN)
*max_dt_width = std::max(*max_dt_width, GetBlockDtString(i).size());
}
}
std::string GetBlockDtString(size_t start_index) {
int end_index = entries_[start_index].block_index;
if (end_index == -1) {
// Block is not closed, implicitly close it at EOF.
end_index = entries_.size() - 1;
}
int64 dt_ms = (entries_[end_index].event->time -
entries_[start_index].event->time).InMilliseconds();
return Int64ToString(dt_ms);
}
std::string GetTimeString(size_t index) {
int64 t_ms = (entries_[index].event->time -
base::TimeTicks()).InMilliseconds();
return Int64ToString(t_ms);
}
std::string GetEventString(size_t index) {
const LoadLog::Event* event = entries_[index].event;
const char* type_str = LoadLog::EventTypeToString(event->type);
switch (event->phase) {
case LoadLog::PHASE_BEGIN:
return std::string("+") + type_str;
case LoadLog::PHASE_END:
return std::string("-") + type_str;
case LoadLog::PHASE_NONE:
return std::string(" ") + type_str;
default:
NOTREACHED();
return std::string();
}
}
static std::string PadStringLeft(const std::string& str, size_t width) {
DCHECK_LE(str.size(), width);
std::string padding;
padding.resize(width - str.size(), ' ');
return padding + str;
}
std::vector<Entry> entries_;
};
} // namespace
// static
std::string LoadLogUtil::PrettyPrintAsEventTree(const LoadLog* log) {
FormatHelper helper;
return helper.ToString(log);
}
} // namespace net
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