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// Copyright 2016 the V8 project 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 "tracing/traced_value.h"
#if defined(NODE_HAVE_I18N_SUPPORT)
#include <unicode/utf8.h>
#include <unicode/utypes.h>
#endif
#include <cmath>
#include <cstdio>
#include <sstream>
#include <string>
#if defined(_STLP_VENDOR_CSTD)
// STLPort doesn't import fpclassify into the std namespace.
#define FPCLASSIFY_NAMESPACE
#else
#define FPCLASSIFY_NAMESPACE std
#endif
namespace node {
namespace tracing {
namespace {
std::string EscapeString(const char* value) {
std::string result;
result += '"';
char number_buffer[10];
#if defined(NODE_HAVE_I18N_SUPPORT)
int32_t len = strlen(value);
int32_t p = 0;
int32_t i = 0;
for (; i < len; p = i) {
UChar32 c;
U8_NEXT_OR_FFFD(value, i, len, c);
switch (c) {
case '\b': result += "\\b"; break;
case '\f': result += "\\f"; break;
case '\n': result += "\\n"; break;
case '\r': result += "\\r"; break;
case '\t': result += "\\t"; break;
case '\\': result += "\\\\"; break;
case '"': result += "\\\""; break;
default:
if (c < 32 || c > 126) {
snprintf(
number_buffer, arraysize(number_buffer), "\\u%04X",
static_cast<uint16_t>(static_cast<uint16_t>(c)));
result += number_buffer;
} else {
result.append(value + p, i - p);
}
}
}
#else
// If we do not have ICU, use a modified version of the non-UTF8 aware
// code from V8's own TracedValue implementation. Note, however, This
// will not produce correctly serialized results for UTF8 values.
while (*value) {
char c = *value++;
switch (c) {
case '\b': result += "\\b"; break;
case '\f': result += "\\f"; break;
case '\n': result += "\\n"; break;
case '\r': result += "\\r"; break;
case '\t': result += "\\t"; break;
case '\\': result += "\\\\"; break;
case '"': result += "\\\""; break;
default:
if (c < '\x20') {
snprintf(
number_buffer, arraysize(number_buffer), "\\u%04X",
static_cast<unsigned>(static_cast<unsigned char>(c)));
result += number_buffer;
} else {
result += c;
}
}
}
#endif // defined(NODE_HAVE_I18N_SUPPORT)
result += '"';
return result;
}
std::string DoubleToCString(double v) {
switch (FPCLASSIFY_NAMESPACE::fpclassify(v)) {
case FP_NAN: return "\"NaN\"";
case FP_INFINITE: return (v < 0.0 ? "\"-Infinity\"" : "\"Infinity\"");
case FP_ZERO: return "0";
default:
// This is a far less sophisticated version than the one used inside v8.
std::ostringstream stream;
stream.imbue(std::locale("C")); // Ignore locale
stream << v;
return stream.str();
}
}
} // namespace
std::unique_ptr<TracedValue> TracedValue::Create() {
return std::unique_ptr<TracedValue>(new TracedValue(false));
}
std::unique_ptr<TracedValue> TracedValue::CreateArray() {
return std::unique_ptr<TracedValue>(new TracedValue(true));
}
TracedValue::TracedValue(bool root_is_array) :
first_item_(true), root_is_array_(root_is_array) {}
void TracedValue::SetInteger(const char* name, int value) {
WriteName(name);
data_ += std::to_string(value);
}
void TracedValue::SetDouble(const char* name, double value) {
WriteName(name);
data_ += DoubleToCString(value);
}
void TracedValue::SetBoolean(const char* name, bool value) {
WriteName(name);
data_ += value ? "true" : "false";
}
void TracedValue::SetNull(const char* name) {
WriteName(name);
data_ += "null";
}
void TracedValue::SetString(const char* name, const char* value) {
WriteName(name);
data_ += EscapeString(value);
}
void TracedValue::BeginDictionary(const char* name) {
WriteName(name);
data_ += '{';
first_item_ = true;
}
void TracedValue::BeginArray(const char* name) {
WriteName(name);
data_ += '[';
first_item_ = true;
}
void TracedValue::AppendInteger(int value) {
WriteComma();
data_ += std::to_string(value);
}
void TracedValue::AppendDouble(double value) {
WriteComma();
data_ += DoubleToCString(value);
}
void TracedValue::AppendBoolean(bool value) {
WriteComma();
data_ += value ? "true" : "false";
}
void TracedValue::AppendNull() {
WriteComma();
data_ += "null";
}
void TracedValue::AppendString(const char* value) {
WriteComma();
data_ += EscapeString(value);
}
void TracedValue::BeginDictionary() {
WriteComma();
data_ += '{';
first_item_ = true;
}
void TracedValue::BeginArray() {
WriteComma();
data_ += '[';
first_item_ = true;
}
void TracedValue::EndDictionary() {
data_ += '}';
first_item_ = false;
}
void TracedValue::EndArray() {
data_ += ']';
first_item_ = false;
}
void TracedValue::WriteComma() {
if (first_item_) {
first_item_ = false;
} else {
data_ += ',';
}
}
void TracedValue::WriteName(const char* name) {
WriteComma();
data_ += '"';
data_ += name;
data_ += "\":";
}
void TracedValue::AppendAsTraceFormat(std::string* out) const {
*out += root_is_array_ ? '[' : '{';
*out += data_;
*out += root_is_array_ ? ']' : '}';
}
} // namespace tracing
} // namespace node
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