JSONPrinter.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "vm/JSONPrinter.h"

#include "mozilla/Assertions.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/IntegerPrintfMacros.h"

#include <stdarg.h>

#include "util/DoubleToString.h"

using namespace js;

JSONPrinter::~JSONPrinter() {
  if (dtoaState_) {
    DestroyDtoaState(dtoaState_);
  }
}

void JSONPrinter::indent() {
  MOZ_ASSERT(indentLevel_ >= 0);
  if (indent_) {
    out_.putChar('\n');
    for (int i = 0; i < indentLevel_; i++) {
      out_.put("  ");
    }
  }
}

void JSONPrinter::propertyName(const char* name) {
  if (!first_) {
    out_.putChar(',');
  }
  indent();
  out_.printf("\"%s\":", name);
  first_ = false;
}

void JSONPrinter::beginObject() {
  if (!first_) {
    out_.putChar(',');
    indent();
  }
  out_.putChar('{');
  indentLevel_++;
  first_ = true;
}

void JSONPrinter::beginList() {
  if (!first_) {
    out_.putChar(',');
  }
  out_.putChar('[');
  first_ = true;
}

void JSONPrinter::beginObjectProperty(const char* name) {
  propertyName(name);
  out_.putChar('{');
  indentLevel_++;
  first_ = true;
}

void JSONPrinter::beginListProperty(const char* name) {
  propertyName(name);
  out_.putChar('[');
  first_ = true;
}

void JSONPrinter::beginStringProperty(const char* name) {
  propertyName(name);
  out_.putChar('"');
}

void JSONPrinter::endStringProperty() { out_.putChar('"'); }

void JSONPrinter::property(const char* name, const char* value) {
  beginStringProperty(name);
  out_.put(value);
  endStringProperty();
}

void JSONPrinter::formatProperty(const char* name, const char* format, ...) {
  va_list ap;
  va_start(ap, format);

  beginStringProperty(name);
  out_.vprintf(format, ap);
  endStringProperty();

  va_end(ap);
}

void JSONPrinter::formatProperty(const char* name, const char* format,
                                 va_list ap) {
  beginStringProperty(name);
  out_.vprintf(format, ap);
  endStringProperty();
}

void JSONPrinter::value(const char* format, ...) {
  va_list ap;
  va_start(ap, format);

  if (!first_) {
    out_.putChar(',');
  }
  out_.putChar('"');
  out_.vprintf(format, ap);
  out_.putChar('"');

  va_end(ap);
  first_ = false;
}

void JSONPrinter::property(const char* name, int32_t value) {
  propertyName(name);
  out_.printf("%" PRId32, value);
}

void JSONPrinter::value(int val) {
  if (!first_) {
    out_.putChar(',');
  }
  out_.printf("%d", val);
  first_ = false;
}

void JSONPrinter::property(const char* name, uint32_t value) {
  propertyName(name);
  out_.printf("%" PRIu32, value);
}

void JSONPrinter::property(const char* name, int64_t value) {
  propertyName(name);
  out_.printf("%" PRId64, value);
}

void JSONPrinter::property(const char* name, uint64_t value) {
  propertyName(name);
  out_.printf("%" PRIu64, value);
}

#if defined(XP_DARWIN) || defined(__OpenBSD__)
void JSONPrinter::property(const char* name, size_t value) {
  propertyName(name);
  out_.printf("%zu", value);
}
#endif

void JSONPrinter::floatProperty(const char* name, double value,
                                size_t precision) {
  if (!mozilla::IsFinite(value)) {
    propertyName(name);
    out_.put("null");
    return;
  }

  if (!dtoaState_) {
    dtoaState_ = NewDtoaState();
    if (!dtoaState_) {
      out_.reportOutOfMemory();
      return;
    }
  }

  char buffer[DTOSTR_STANDARD_BUFFER_SIZE];
  char* str = js_dtostr(dtoaState_, buffer, sizeof(buffer), DTOSTR_STANDARD,
                        precision, value);
  if (!str) {
    out_.reportOutOfMemory();
    return;
  }

  property(name, str);
}

void JSONPrinter::property(const char* name, const mozilla::TimeDuration& dur,
                           TimePrecision precision) {
  if (precision == MICROSECONDS) {
    property(name, static_cast<int64_t>(dur.ToMicroseconds()));
    return;
  }

  propertyName(name);
  lldiv_t split;
  switch (precision) {
    case SECONDS:
      split = lldiv(static_cast<int64_t>(dur.ToMilliseconds()), 1000);
      break;
    case MILLISECONDS:
      split = lldiv(static_cast<int64_t>(dur.ToMicroseconds()), 1000);
      break;
    case MICROSECONDS:
      MOZ_ASSERT_UNREACHABLE("");
  };
  out_.printf("%lld.%03lld", split.quot, split.rem);
}

void JSONPrinter::endObject() {
  indentLevel_--;
  indent();
  out_.putChar('}');
  first_ = false;
}

void JSONPrinter::endList() {
  out_.putChar(']');
  first_ = false;
}