backend/json/json_value.cpp

#include "adt/make/cast.h"

#include "json_batchallocator.h"
#include <cassert>
#include <cstddef>    /* size_t */
#include <cstring>
#include <iostream>
#include <json/value.h>
#include <json/writer.h>
#include <stdexcept>
#include <utility>

#define JSON_ASSERT_UNREACHABLE assert (false)
#define JSON_ASSERT(condition) assert (condition);     /* @todo <= change this into an exception throw */
#define JSON_ASSERT_MESSAGE(condition, message) if (!(condition)) throw std::runtime_error (message);

namespace Json
{

const Value Value::null;
const Int Value::minInt = Int (~(UInt (-1) / 2));
const Int Value::maxInt = Int (UInt (-1) / 2);
const UInt Value::maxUInt = UInt (-1);

ValueAllocator::~ValueAllocator ()
{
}

class DefaultValueAllocator
  : public ValueAllocator
{
public:
  virtual
  ~DefaultValueAllocator ()
  {
  }

  virtual char *
  makeMemberName (const char *memberName)
  {
    return duplicateStringValue (memberName);
  }

  virtual void
  releaseMemberName (char *memberName)
  {
    releaseStringValue (memberName);
  }

  virtual char *
  duplicateStringValue (const char *value, unsigned int length = unknown)
  {
    /*
     * @todo invesgate this old optimization
     * if ( !value  ||  value[0] == 0 )
     *   return 0;
     */

    if (length == unknown)
      length = (unsigned int)strlen (value);
    char *newString = static_cast<char *> (malloc (length + 1));
    memcpy (newString, value, length);
    newString[length] = 0;
    return newString;
  }

  virtual void
  releaseStringValue (char *value)
  {
    if (value)
      free (value);
  }
};

static ValueAllocator * &
valueAllocator ()
{
  static DefaultValueAllocator defaultAllocator;
  static ValueAllocator *valueAllocator = &defaultAllocator;

  return valueAllocator;
}

static struct DummyValueAllocatorInitializer
{
  DummyValueAllocatorInitializer ()
  {
    valueAllocator ();        /* ensure valueAllocator() statics are initialized before main(). */
  }
} dummyValueAllocatorInitializer;


/*
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * class ValueIteratorBase
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 */

ValueIteratorBase::ValueIteratorBase ()
  : current_ ()
  , isNull_ (true)
{
}

ValueIteratorBase::ValueIteratorBase (const Value::ObjectValues::iterator &current)
  : current_ (current)
  , isNull_ (false)
{
}

Value &
ValueIteratorBase::deref () const
{
  return current_->second;
}

void
ValueIteratorBase::increment ()
{
  ++current_;
}

void
ValueIteratorBase::decrement ()
{
  --current_;
}

ValueIteratorBase::difference_type
ValueIteratorBase::computeDistance (const SelfType &other) const
{
  /*
   * Iterator for null value are initialized using the default
   * constructor, which initialize current_ to the default
   * std::map::iterator. As begin() and end() are two instance
   * of the default std::map::iterator, they can not be compared.
   * To allow this, we handle this comparison specifically.
   */
  if (isNull_ && other.isNull_)
    return 0;


  /*
   * Usage of std::distance is not portable (does not compile with Sun Studio 12 RogueWave STL,
   * which is the one used by default).
   * Using a portable hand-made version for non random iterator instead:
   *   return difference_type( std::distance( current_, other.current_ ) );
   */
  difference_type myDistance = 0;
  for (Value::ObjectValues::iterator it = current_; it != other.current_; ++it)
    ++myDistance;
  return myDistance;
}

bool
ValueIteratorBase::isEqual (const SelfType &other) const
{
  if (isNull_)
    return other.isNull_;
  return current_ == other.current_;
}

void
ValueIteratorBase::copy (const SelfType &other)
{
  current_ = other.current_;
}

Value
ValueIteratorBase::key () const
{
  const Value::CZString czstring = (*current_).first;

  if (czstring.c_str ())
    {
      if (czstring.isStaticString ())
        return Value (StaticString (czstring.c_str ()));
      return Value (czstring.c_str ());
    }
  return Value (czstring.index ());
}

UInt
ValueIteratorBase::index () const
{
  const Value::CZString czstring = (*current_).first;

  if (!czstring.c_str ())
    return czstring.index ();
  return Value::UInt (-1);
}

const char *
ValueIteratorBase::memberName () const
{
  const char *name = (*current_).first.c_str ();

  return name ? name : "";
}

/*
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * class ValueConstIterator
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 */

ValueConstIterator::ValueConstIterator ()
{
}

ValueConstIterator::ValueConstIterator (const Value::ObjectValues::iterator &current)
  : ValueIteratorBase (current)
{
}

ValueConstIterator &
ValueConstIterator::operator = (const ValueIteratorBase &other)
{
  copy (other);
  return *this;
}

/*
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * class ValueIterator
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 */

ValueIterator::ValueIterator ()
{
}

ValueIterator::ValueIterator (const Value::ObjectValues::iterator &current)
  : ValueIteratorBase (current)
{
}

ValueIterator::ValueIterator (const ValueConstIterator &other)
  : ValueIteratorBase (other)
{
}

ValueIterator::ValueIterator (const ValueIterator &other)
  : ValueIteratorBase (other)
{
}

ValueIterator &
ValueIterator::operator = (const SelfType &other)
{
  copy (other);
  return *this;
}


/*
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * class Value::CommentInfo
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 */


Value::CommentInfo::CommentInfo ()
  : comment_ (0)
{
}

Value::CommentInfo::~CommentInfo ()
{
  if (comment_)
    valueAllocator ()->releaseStringValue (comment_);
}

void
Value::CommentInfo::setComment (const char *text)
{
  if (comment_)
    valueAllocator ()->releaseStringValue (comment_);
  JSON_ASSERT (text);
  JSON_ASSERT_MESSAGE (text[0] == '\0' || text[0] == '/', "Comments must start with /");
  /* It seems that / ** / style comments are acceptable as well. */
  comment_ = valueAllocator ()->duplicateStringValue (text);
}

/*
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * class Value::CZString
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 */

/*
 * Notes: index_ indicates if the string was allocated when
 * a string is stored.
 */

Value::CZString::CZString (int index)
  : cstr_ (0)
  , index_ (index)
{
}

Value::CZString::CZString (const char *cstr, DuplicationPolicy allocate)
  : cstr_ (allocate == duplicate ? valueAllocator ()->makeMemberName (cstr)
             : cstr)
  , index_ (allocate)
{
}

Value::CZString::CZString (const CZString &other)
  : cstr_ (other.index_ != noDuplication && other.cstr_ != 0
           ?  valueAllocator ()->makeMemberName (other.cstr_)
             : other.cstr_)
  , index_ (other.cstr_ ? (other.index_ == noDuplication ? noDuplication
                             : duplicate)
              : other.index_)
{
}

Value::CZString::~CZString ()
{
  if (cstr_ && index_ == duplicate)
    valueAllocator ()->releaseMemberName (const_cast<char *> (cstr_));
}

void
Value::CZString::swap (CZString &other)
{
  std::swap (cstr_, other.cstr_);
  std::swap (index_, other.index_);
}

Value::CZString &
Value::CZString::operator = (const CZString &other)
{
  CZString temp (other);

  swap (temp);
  return *this;
}

bool
Value::CZString::operator < (const CZString &other) const
{
  if (cstr_)
    return strcmp (cstr_, other.cstr_) < 0;
  return index_ < other.index_;
}

bool
Value::CZString::operator == (const CZString &other) const
{
  if (cstr_)
    return strcmp (cstr_, other.cstr_) == 0;
  return index_ == other.index_;
}

int
Value::CZString::index () const
{
  return index_;
}

const char *
Value::CZString::c_str () const
{
  return cstr_;
}

bool
Value::CZString::isStaticString () const
{
  return index_ == noDuplication;
}

/*
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * class Value::Value
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 * //////////////////////////////////////////////////////////////////
 */

/*! \internal Default constructor initialization must be equivalent to:
 * memset( this, 0, sizeof(Value) )
 * This optimization is used in ValueInternalMap fast allocator.
 */
Value::Value (ValueType type)
  : comments_ (nullptr)
  , type_ (type)
  , allocated_ (0)
{
  switch (type)
    {
    case nullValue :
      break;
    case intValue :
    case uintValue :
      value_.int_ = 0;
      break;
    case realValue :
      value_.real_ = 0.0;
      break;
    case stringValue:
      value_.string_ = 0;
      break;
    case arrayValue:
    case objectValue:
      value_.map_ = new ObjectValues ();
      break;
    case booleanValue:
      value_.bool_ = false;
      break;
    default:
      JSON_ASSERT_UNREACHABLE;
    }
}

Value::Value (Int value)
  : comments_ (nullptr)
  , type_ (intValue)
{
  value_.int_ = value;
}

Value::Value (UInt value)
  : comments_ (nullptr)
  , type_ (uintValue)
{
  value_.uint_ = value;
}

Value::Value (double value)
  : comments_ (nullptr)
  , type_ (realValue)
{
  value_.real_ = value;
}

Value::Value (const char *value)
  : comments_ (nullptr)
  , type_ (stringValue)
  , allocated_ (true)
{
  value_.string_ = valueAllocator ()->duplicateStringValue (value);
}

Value::Value (const char *beginValue, const char *endValue)
  : comments_ (nullptr)
  , type_ (stringValue)
  , allocated_ (true)
{
  value_.string_ = valueAllocator ()->duplicateStringValue (beginValue,
                                                            UInt (endValue - beginValue));
}

static Value
make_value (make::value const &v)
{
  using make::value;
  using make::value_cast;
  switch (v.type_code ())
    {
    case value::VALUE:
      if (is_integral (*v.type))
        if (is_signed (*v.type))
          return Value (value_cast<Int> (v));
        else
          return Value (value_cast<UInt> (v));
      else if (is_floating_point (*v.type))
        return Value (value_cast<double> (v));
      return Value (v.str ());
    case value::ARRAY:
      return Value (v.array ());
    case value::MAP:
      return Value (v.map ());
    default:
      throw __func__;
    }
}

Value::Value (make::array const &value)
  : comments_ (nullptr)
  , type_ (nullValue)
  , allocated_ (false)
{
  UInt i = 0;
  foreach (make::value const &v, value.data)
    (*this)[i++] = make_value (v);
}

Value::Value (make::map const &value)
  : comments_ (nullptr)
  , type_ (nullValue)
  , allocated_ (false)
{
  foreach (make::value_pair const &v, value.data)
    (*this)[v.first.str ()] = make_value (v.second);
}

Value::Value (const std::string &value)
  : comments_ (nullptr)
  , type_ (stringValue)
  , allocated_ (true)
{
  value_.string_ = valueAllocator ()->duplicateStringValue (value.c_str (),
                                                            (unsigned int)value.length ());
}

Value::Value (const StaticString &value)
  : comments_ (nullptr)
  , type_ (stringValue)
  , allocated_ (false)
{
  value_.string_ = const_cast<char *> (value.c_str ());
}

Value::Value (bool value)
  : comments_ (nullptr)
  , type_ (booleanValue)
{
  value_.bool_ = value;
}

Value::Value (const Value &other)
  : comments_ (nullptr)
  , type_ (other.type_)
{
  switch (type_)
    {
    case nullValue:
    case intValue:
    case uintValue:
    case realValue:
    case booleanValue:
      value_ = other.value_;
      break;
    case stringValue:
      if (other.value_.string_)
        {
          value_.string_ = valueAllocator ()->duplicateStringValue (other.value_.string_);
          allocated_ = true;
        }
      else
        value_.string_ = 0;
      break;
    case arrayValue:
    case objectValue:
      value_.map_ = new ObjectValues (*other.value_.map_);
      break;
    default:
      JSON_ASSERT_UNREACHABLE;
    }
  if (other.comments_)
    {
      comments_ = new CommentInfo[numberOfCommentPlacement];
      for (int comment = 0; comment < numberOfCommentPlacement; ++comment)
        {
          const CommentInfo &otherComment = other.comments_[comment];
          if (otherComment.comment_)
            comments_[comment].setComment (otherComment.comment_);
        }
    }
}

Value::~Value ()
{
  switch (type_)
    {
    case nullValue:
    case intValue:
    case uintValue:
    case realValue:
    case booleanValue:
      break;
    case stringValue:
      if (allocated_)
        valueAllocator ()->releaseStringValue (value_.string_);
      break;
    case arrayValue:
    case objectValue:
      delete value_.map_;
      break;
    default:
      JSON_ASSERT_UNREACHABLE;
    }

  if (comments_)
    delete[] comments_;
}

Value &
Value::operator = (const Value &other)
{
  Value temp (other);

  swap (temp);
  return *this;
}

void
Value::swap (Value &other)
{
  ValueType temp = type_;

  type_ = other.type_;
  other.type_ = temp;
  std::swap (value_, other.value_);
  int temp2 = allocated_;
  allocated_ = other.allocated_;
  other.allocated_ = temp2;
}

ValueType
Value::type () const
{
  return type_;
}

int
Value::compare (const Value &other)
{
  /*
   * int typeDelta = other.type_ - type_;
   * switch ( type_ )
   * {
   * case nullValue:
   *
   * return other.type_ == type_;
   * case intValue:
   * if ( other.type_.isNumeric()
   * case uintValue:
   * case realValue:
   * case booleanValue:
   * break;
   * case stringValue,
   * break;
   * case arrayValue:
   * delete value_.array_;
   * break;
   * case objectValue:
   * delete value_.map_;
   * default:
   * JSON_ASSERT_UNREACHABLE;
   * }
   */
  return 0;   /* unreachable */
}

bool
Value::operator < (const Value &other) const
{
  int typeDelta = type_ - other.type_;

  if (typeDelta)
    return typeDelta < 0 ? true : false;
  switch (type_)
    {
    case nullValue:
      return false;
    case intValue:
      return value_.int_ < other.value_.int_;
    case uintValue:
      return value_.uint_ < other.value_.uint_;
    case realValue:
      return value_.real_ < other.value_.real_;
    case booleanValue:
      return value_.bool_ < other.value_.bool_;
    case stringValue:
      return (value_.string_ == 0 && other.value_.string_)
             || (other.value_.string_
                 && value_.string_
                 && strcmp (value_.string_, other.value_.string_) < 0);
    case arrayValue:
    case objectValue:
      {
        int delta = int(value_.map_->size () - other.value_.map_->size ());
        if (delta)
          return delta < 0;
        return (*value_.map_) < (*other.value_.map_);
      }
    default:
      JSON_ASSERT_UNREACHABLE;
    }
  return 0;   /* unreachable */
}

bool
Value::operator <= (const Value &other) const
{
  return !(other > *this);
}

bool
Value::operator >= (const Value &other) const
{
  return !(*this < other);
}

bool
Value::operator > (const Value &other) const
{
  return other < *this;
}

bool
Value::operator == (const Value &other) const
{
  /*
   * if ( type_ != other.type_ )
   * GCC 2.95.3 says:
   * attempt to take address of bit-field structure member `Json::Value::type_'
   * Beats me, but a temp solves the problem.
   */
  int temp = other.type_;

  if (type_ != temp)
    return false;
  switch (type_)
    {
    case nullValue:
      return true;
    case intValue:
      return value_.int_ == other.value_.int_;
    case uintValue:
      return value_.uint_ == other.value_.uint_;
    case realValue:
      return value_.real_ == other.value_.real_;
    case booleanValue:
      return value_.bool_ == other.value_.bool_;
    case stringValue:
      return (value_.string_ == other.value_.string_)
             || (other.value_.string_
                 && value_.string_
                 && strcmp (value_.string_, other.value_.string_) == 0);
    case arrayValue:
    case objectValue:
      return value_.map_->size () == other.value_.map_->size ()
             && (*value_.map_) == (*other.value_.map_);
    default:
      JSON_ASSERT_UNREACHABLE;
    }
  return 0;   /* unreachable */
}

bool
Value::operator != (const Value &other) const
{
  return !(*this == other);
}

const char *
Value::asCString () const
{
  JSON_ASSERT (type_ == stringValue);
  return value_.string_;
}

std::string
Value::asString () const
{
  switch (type_)
    {
    case nullValue:
      return "";
    case stringValue:
      return value_.string_ ? value_.string_ : "";
    case booleanValue:
      return value_.bool_ ? "true" : "false";
    case intValue:
    case uintValue:
    case realValue:
    case arrayValue:
    case objectValue:
      JSON_ASSERT_MESSAGE (false, "Type is not convertible to string");
    default:
      JSON_ASSERT_UNREACHABLE;
    }
  return "";   /* unreachable */
}

Value::Int
Value::asInt () const
{
  switch (type_)
    {
    case nullValue:
      return 0;
    case intValue:
      return value_.int_;
    case uintValue:
      JSON_ASSERT_MESSAGE (value_.uint_ < (unsigned)maxInt, "integer out of signed integer range");
      return value_.uint_;
    case realValue:
      JSON_ASSERT_MESSAGE (value_.real_ >= minInt && value_.real_ <= maxInt, "Real out of signed integer range");
      return Int (value_.real_);
    case booleanValue:
      return value_.bool_ ? 1 : 0;
    case stringValue:
    case arrayValue:
    case objectValue:
      JSON_ASSERT_MESSAGE (false, "Type is not convertible to int");
    default:
      JSON_ASSERT_UNREACHABLE;
    }
  return 0;   /* unreachable; */
}

Value::UInt
Value::asUInt () const
{
  switch (type_)
    {
    case nullValue:
      return 0;
    case intValue:
      JSON_ASSERT_MESSAGE (value_.int_ >= 0, "Negative integer can not be converted to unsigned integer");
      return value_.int_;
    case uintValue:
      return value_.uint_;
    case realValue:
      JSON_ASSERT_MESSAGE (value_.real_ >= 0 && value_.real_ <= maxUInt, "Real out of unsigned integer range");
      return UInt (value_.real_);
    case booleanValue:
      return value_.bool_ ? 1 : 0;
    case stringValue:
    case arrayValue:
    case objectValue:
      JSON_ASSERT_MESSAGE (false, "Type is not convertible to uint");
    default:
      JSON_ASSERT_UNREACHABLE;
    }
  return 0;   /* unreachable; */
}

double
Value::asDouble () const
{
  switch (type_)
    {
    case nullValue:
      return 0.0;
    case intValue:
      return value_.int_;
    case uintValue:
      return value_.uint_;
    case realValue:
      return value_.real_;
    case booleanValue:
      return value_.bool_ ? 1.0 : 0.0;
    case stringValue:
    case arrayValue:
    case objectValue:
      JSON_ASSERT_MESSAGE (false, "Type is not convertible to double");
    default:
      JSON_ASSERT_UNREACHABLE;
    }
  return 0;   /* unreachable; */
}

bool
Value::asBool () const
{
  switch (type_)
    {
    case nullValue:
      return false;
    case intValue:
    case uintValue:
      return value_.int_ != 0;
    case realValue:
      return value_.real_ != 0.0;
    case booleanValue:
      return value_.bool_;
    case stringValue:
      return value_.string_ && value_.string_[0] != 0;
    case arrayValue:
    case objectValue:
      return value_.map_->size () != 0;
    default:
      JSON_ASSERT_UNREACHABLE;
    }
  return false;   /* unreachable; */
}

bool
Value::isConvertibleTo (ValueType other) const
{
  switch (type_)
    {
    case nullValue:
      return true;
    case intValue:
      return (other == nullValue && value_.int_ == 0)
             || other == intValue
             || (other == uintValue && value_.int_ >= 0)
             || other == realValue
             || other == stringValue
             || other == booleanValue;
    case uintValue:
      return (other == nullValue && value_.uint_ == 0)
             || (other == intValue && value_.uint_ <= (unsigned)maxInt)
             || other == uintValue
             || other == realValue
             || other == stringValue
             || other == booleanValue;
    case realValue:
      return (other == nullValue && value_.real_ == 0.0)
             || (other == intValue && value_.real_ >= minInt && value_.real_ <= maxInt)
             || (other == uintValue && value_.real_ >= 0 && value_.real_ <= maxUInt)
             || other == realValue
             || other == stringValue
             || other == booleanValue;
    case booleanValue:
      return (other == nullValue && value_.bool_ == false)
             || other == intValue
             || other == uintValue
             || other == realValue
             || other == stringValue
             || other == booleanValue;
    case stringValue:
      return other == stringValue
             || (other == nullValue && (!value_.string_ || value_.string_[0] == 0));
    case arrayValue:
      return other == arrayValue
             || (other == nullValue && value_.map_->size () == 0);
    case objectValue:
      return other == objectValue
             || (other == nullValue && value_.map_->size () == 0);
    default:
      JSON_ASSERT_UNREACHABLE;
    }
  return false;   /* unreachable; */
}

/* / Number of values in array or object */
Value::UInt
Value::size () const
{
  switch (type_)
    {
    case nullValue:
    case intValue:
    case uintValue:
    case realValue:
    case booleanValue:
    case stringValue:
      return 0;
    case arrayValue:   /* size of the array is highest index + 1 */
      if (!value_.map_->empty ())
        {
          ObjectValues::const_iterator itLast = value_.map_->end ();
          --itLast;
          return (*itLast).first.index () + 1;
        }
      return 0;
    case objectValue:
      return Int (value_.map_->size ());
    default:
      JSON_ASSERT_UNREACHABLE;
    }
  return 0;   /* unreachable; */
}

bool
Value::empty () const
{
  if (isNull () || isArray () || isObject ())
    return size () == 0u;
  else
    return false;
}

bool
Value::operator ! () const
{
  return isNull ();
}

void
Value::clear ()
{
  JSON_ASSERT (type_ == nullValue || type_ == arrayValue || type_ == objectValue);

  switch (type_)
    {
    case arrayValue:
    case objectValue:
      value_.map_->clear ();
      break;
    default:
      break;
    }
}

void
Value::resize (UInt newSize)
{
  JSON_ASSERT (type_ == nullValue || type_ == arrayValue);
  if (type_ == nullValue)
    *this = Value (arrayValue);
  UInt oldSize = size ();
  if (newSize == 0)
    clear ();
  else if (newSize > oldSize)
    (*this)[newSize - 1];
  else
    {
      for (UInt index = newSize; index < oldSize; ++index)
        value_.map_->erase (index);
      assert (size () == newSize);
    }
}

Value &
Value::operator [] (UInt index)
{
  JSON_ASSERT (type_ == nullValue || type_ == arrayValue);
  if (type_ == nullValue)
    *this = Value (arrayValue);
  CZString key (index);
  ObjectValues::iterator it = value_.map_->lower_bound (key);
  if (it != value_.map_->end () && (*it).first == key)
    return (*it).second;

  ObjectValues::value_type defaultValue (key, null);
  it = value_.map_->insert (it, defaultValue);
  return (*it).second;
}

const Value &
Value::operator [] (UInt index) const
{
  JSON_ASSERT (type_ == nullValue || type_ == arrayValue);
  if (type_ == nullValue)
    return null;
  CZString key (index);
  ObjectValues::const_iterator it = value_.map_->find (key);
  if (it == value_.map_->end ())
    return null;
  return (*it).second;
}

Value &
Value::operator [] (const char *key)
{
  return resolveReference (key, false);
}

Value &
Value::resolveReference (const char *key, bool isStatic)
{
  JSON_ASSERT (type_ == nullValue || type_ == objectValue);
  if (type_ == nullValue)
    *this = Value (objectValue);
  CZString actualKey (key, isStatic ? CZString::noDuplication
                      : CZString::duplicateOnCopy);
  ObjectValues::iterator it = value_.map_->lower_bound (actualKey);
  if (it != value_.map_->end () && (*it).first == actualKey)
    return (*it).second;

  ObjectValues::value_type defaultValue (actualKey, null);
  it = value_.map_->insert (it, defaultValue);
  Value &value = (*it).second;
  return value;
}

Value
Value::get (UInt index, const Value &defaultValue) const
{
  const Value *value = &((*this)[index]);

  return value == &null ? defaultValue : *value;
}

bool
Value::isValidIndex (UInt index) const
{
  return index < size ();
}

const Value &
Value::operator [] (const char *key) const
{
  JSON_ASSERT (type_ == nullValue || type_ == objectValue);
  if (type_ == nullValue)
    return null;
  CZString actualKey (key, CZString::noDuplication);
  ObjectValues::const_iterator it = value_.map_->find (actualKey);
  if (it == value_.map_->end ())
    return null;
  return it->second;
}

Value &
Value::operator [] (const std::string &key)
{
  return (*this)[key.c_str ()];
}

const Value &
Value::operator [] (const std::string &key) const
{
  return (*this)[key.c_str ()];
}

Value &
Value::operator [] (const StaticString &key)
{
  return resolveReference (key.c_str (), true);
}

Value &
Value::append (const Value &value)
{
  return (*this)[size ()] = value;
}

Value
Value::get (const char *key, const Value &defaultValue) const
{
  const Value *value = &((*this)[key]);

  return value == &null ? defaultValue : *value;
}

Value
Value::get (const std::string &key, const Value &defaultValue) const
{
  return get (key.c_str (), defaultValue);
}

Value
Value::removeMember (const char *key)
{
  JSON_ASSERT (type_ == nullValue || type_ == objectValue);
  if (type_ == nullValue)
    return null;
  CZString actualKey (key, CZString::noDuplication);
  ObjectValues::iterator it = value_.map_->find (actualKey);
  if (it == value_.map_->end ())
    return null;
  Value old (it->second);
  value_.map_->erase (it);
  return old;
}

Value
Value::removeMember (const std::string &key)
{
  return removeMember (key.c_str ());
}

bool
Value::isMember (const char *key) const
{
  const Value *value = &((*this)[key]);

  return value != &null;
}

bool
Value::isMember (const std::string &key) const
{
  return isMember (key.c_str ());
}

Value::Members
Value::getMemberNames () const
{
  JSON_ASSERT (type_ == nullValue || type_ == objectValue);
  if (type_ == nullValue)
    return Value::Members ();
  Members members;
  members.reserve (value_.map_->size ());
  ObjectValues::const_iterator it = value_.map_->begin ();
  ObjectValues::const_iterator itEnd = value_.map_->end ();
  for (; it != itEnd; ++it)
    members.push_back (std::string ((*it).first.c_str ()));
  return members;
}

bool
Value::isNull () const
{
  return type_ == nullValue;
}

bool
Value::isBool () const
{
  return type_ == booleanValue;
}

bool
Value::isInt () const
{
  return type_ == intValue;
}

bool
Value::isUInt () const
{
  return type_ == uintValue;
}

bool
Value::isIntegral () const
{
  return type_ == intValue
         || type_ == uintValue
         || type_ == booleanValue;
}

bool
Value::isDouble () const
{
  return type_ == realValue;
}

bool
Value::isNumeric () const
{
  return isIntegral () || isDouble ();
}

bool
Value::isString () const
{
  return type_ == stringValue;
}

bool
Value::isArray () const
{
  return type_ == nullValue || type_ == arrayValue;
}

bool
Value::isObject () const
{
  return type_ == nullValue || type_ == objectValue;
}

void
Value::setComment (const char *comment, CommentPlacement placement)
{
  if (!comments_)
    comments_ = new CommentInfo[numberOfCommentPlacement];
  comments_[placement].setComment (comment);
}

void
Value::setComment (const std::string &comment, CommentPlacement placement)
{
  setComment (comment.c_str (), placement);
}

bool
Value::hasComment (CommentPlacement placement) const
{
  return comments_ != 0 && comments_[placement].comment_ != 0;
}

std::string
Value::getComment (CommentPlacement placement) const
{
  if (hasComment (placement))
    return comments_[placement].comment_;
  return "";
}

std::string
Value::toStyledString () const
{
  StyledWriter writer;

  return writer.write (*this);
}

Value::const_iterator
Value::begin () const
{
  switch (type_)
    {
    case arrayValue:
    case objectValue:
      if (value_.map_)
        return const_iterator (value_.map_->begin ());
      break;
    default:
      break;
    }
  return const_iterator ();
}

Value::const_iterator
Value::end () const
{
  switch (type_)
    {
    case arrayValue:
    case objectValue:
      if (value_.map_)
        return const_iterator (value_.map_->end ());
      break;
    default:
      break;
    }
  return const_iterator ();
}

Value::iterator
Value::begin ()
{
  switch (type_)
    {
    case arrayValue:
    case objectValue:
      if (value_.map_)
        return iterator (value_.map_->begin ());
      break;
    default:
      break;
    }
  return iterator ();
}

Value::iterator
Value::end ()
{
  switch (type_)
    {
    case arrayValue:
    case objectValue:
      if (value_.map_)
        return iterator (value_.map_->end ());
      break;
    default:
      break;
    }
  return iterator ();
}

/*
 * class PathArgument
 * //////////////////////////////////////////////////////////////////
 */

PathArgument::PathArgument ()
  : kind_ (kindNone)
{
}

PathArgument::PathArgument (Value::UInt index)
  : index_ (index)
  , kind_ (kindIndex)
{
}

PathArgument::PathArgument (const char *key)
  : key_ (key)
  , kind_ (kindKey)
{
}

PathArgument::PathArgument (const std::string &key)
  : key_ (key.c_str ())
  , kind_ (kindKey)
{
}

/*
 * class Path
 * //////////////////////////////////////////////////////////////////
 */

Path::Path (const std::string &path, const PathArgument &a1, const PathArgument &a2, const PathArgument &a3, const PathArgument &a4, const PathArgument &a5)
{
  InArgs in;

  in.push_back (&a1);
  in.push_back (&a2);
  in.push_back (&a3);
  in.push_back (&a4);
  in.push_back (&a5);
  makePath (path, in);
}

void
Path::makePath (const std::string &path, const InArgs &in)
{
  const char *current = path.c_str ();
  const char *end = current + path.length ();
  InArgs::const_iterator itInArg = in.begin ();

  while (current != end)
    {
      if (*current == '[')
        {
          ++current;
          if (*current == '%')
            addPathInArg (path, in, itInArg, PathArgument::kindIndex);
          else
            {
              Value::UInt index = 0;
              for (; current != end && *current >= '0' && *current <= '9'; ++current)
                index = index * 10 + Value::UInt (*current - '0');
              args_.push_back (index);
            }
          if (current == end || *current++ != ']')
            invalidPath (path, int(current - path.c_str ()));
        }
      else if (*current == '%')
        {
          addPathInArg (path, in, itInArg, PathArgument::kindKey);
          ++current;
        }
      else if (*current == '.')
        ++current;
      else
        {
          const char *beginName = current;
          while (current != end && !strchr ("[.", *current))
            ++current;
          args_.push_back (std::string (beginName, current));
        }
    }
}

void
Path::addPathInArg (const std::string &path, const InArgs &in, InArgs::const_iterator &itInArg, PathArgument::Kind kind)
{
  if (itInArg == in.end ())
    {
      /* Error: missing argument %d */
    }
  else if ((*itInArg)->kind_ != kind)
    {
      /* Error: bad argument type */
    }
  else
    args_.push_back (**itInArg);
}

void
Path::invalidPath (const std::string &path, int location)
{
  /* Error: invalid path. */
}

const Value &
Path::resolve (const Value &root) const
{
  const Value *node = &root;

  for (Args::const_iterator it = args_.begin (); it != args_.end (); ++it)
    {
      const PathArgument &arg = *it;
      if (arg.kind_ == PathArgument::kindIndex)
        {
          if (!node->isArray () || node->isValidIndex (arg.index_))
            {
              /* Error: unable to resolve path (array value expected at position... */
            }
          node = &((*node)[arg.index_]);
        }
      else if (arg.kind_ == PathArgument::kindKey)
        {
          if (!node->isObject ())
            {
              /* Error: unable to resolve path (object value expected at position...) */
            }
          node = &((*node)[arg.key_]);
          if (node == &Value::null)
            {
              /* Error: unable to resolve path (object has no member named '' at position...) */
            }
        }
    }
  return *node;
}

Value
Path::resolve (const Value &root, const Value &defaultValue) const
{
  const Value *node = &root;

  for (Args::const_iterator it = args_.begin (); it != args_.end (); ++it)
    {
      const PathArgument &arg = *it;
      if (arg.kind_ == PathArgument::kindIndex)
        {
          if (!node->isArray () || node->isValidIndex (arg.index_))
            return defaultValue;
          node = &((*node)[arg.index_]);
        }
      else if (arg.kind_ == PathArgument::kindKey)
        {
          if (!node->isObject ())
            return defaultValue;
          node = &((*node)[arg.key_]);
          if (node == &Value::null)
            return defaultValue;
        }
    }
  return *node;
}

Value &
Path::make (Value &root) const
{
  Value *node = &root;

  for (Args::const_iterator it = args_.begin (); it != args_.end (); ++it)
    {
      const PathArgument &arg = *it;
      if (arg.kind_ == PathArgument::kindIndex)
        {
          if (!node->isArray ())
            {
              /* Error: node is not an array at position ... */
            }
          node = &((*node)[arg.index_]);
        }
      else if (arg.kind_ == PathArgument::kindKey)
        {
          if (!node->isObject ())
            {
              /* Error: node is not an object at position... */
            }
          node = &((*node)[arg.key_]);
        }
    }
  return *node;
}

} /* namespace Json */
Revision:	1.2
Committed:	Mon Oct 18 06:53:59 2010 UTC (15 years, 11 months ago) by sf-pippijn
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.1:	+2 -2 lines
Log Message:	gcc 4.5; moved some code; background colour support