/// <summary>
/// Converts the value of a specified object to an equivalent string representation using
/// specified format and culture-specific formatting information.
/// </summary>
/// <param name="sb">String builder to which formatted string should be appended.</param>
/// <param name="format">A format string containing formatting specifications.</param>
/// <param name="arg">An object to format.</param>
/// <param name="formatProvider">An object that supplies format information about the current instance.</param>
/// <param name="maxLength">
/// Maximum number of characters allowed to the formatter. Formatting should fail (and return false)
/// if this number of characters is breached. Multi-lined formatters should ignore this parameter.
/// Negative value indicates that formatter has unlimited space available. On output contains remaining number of characters available.
/// </param>
/// <returns>
/// true if representation of <paramref name="arg" /> has been successfully appended to <paramref name="sb" />
/// within given number of allowed characters; otherwise false.
/// </returns>
internal override bool Format(StringBuilder sb, string format, object arg, IFormatProvider formatProvider, ref int maxLength)
{
var success = true;
var originalLength = sb.Length;
if (PushCurrentObject(arg))
{
if (arg == null)
{
success = FormatInfoUtils.TryAppendString(this, sb, FormatInfoUtils.DefaultNullFormatted, success, ref maxLength);
}
else
{
var keys = GetKeysCollection(arg);
var keyType = GetDeclaredKeyValueType(arg, true);
var valueType = GetDeclaredKeyValueType(arg, false);
var sfi = new ScalarFormatInfo(this);
success = success && sfi.AppendInstanceTypeName(arg, sb, ref maxLength);
// Using scalar format info to append type name ensures that scalar types will be
// represented with their short forms rather than CTS names which are less readable
if (!string.IsNullOrEmpty(InstanceName))
{
success = FormatInfoUtils.TryAppendSpaceIfNeeded(this, sb, success, ref maxLength);
success = FormatInfoUtils.TryAppendString(this, sb, InstanceName, success, ref maxLength);
}
if (IsMultiLinedFormat)
{
success = FormatInfoUtils.TryAppendSpaceIfNeeded(this, sb, success, ref maxLength);
success = FormatInfoUtils.TryAppendString(this, sb, "= ", success, ref maxLength);
}
else
{
success = FormatInfoUtils.TryAppendChar(this, sb, '=', success, ref maxLength);
}
success = FormatInfoUtils.TryAppendString(this, sb, FirstContainedValuePrefix, success, ref maxLength);
if (MaximumDepth > 0)
{
MaximumDepth--;
var enumerator = keys.GetEnumerator();
var isFirstValue = true;
var key = new object[2];
var keyFetched = new bool[2];
keyFetched[0] = enumerator.MoveNext();
if (keyFetched[0])
{
key[0] = enumerator.Current;
keyFetched[1] = enumerator.MoveNext();
if (keyFetched[1])
{
key[1] = enumerator.Current;
}
}
VerboseFormatInfoBase containedItemsFormat = new VerboseFormatInfo(this);
var itemPos = 0;
while (keyFetched[0])
{
IncIndentationLevel(keyFetched[1]);
containedItemsFormat.IncIndentationLevel(keyFetched[1]);
success = success && FormatLinePrefix(sb, isFirstValue, !keyFetched[1], false, 0, ref maxLength);
isFirstValue = false;
success = FormatInfoUtils.TryAppendString(this, sb, "Item[", success, ref maxLength);
success = FormatInfoUtils.TryAppendString(this, sb, itemPos.ToString("0"), success, ref maxLength);
itemPos++;
success = FormatInfoUtils.TryAppendString(this, sb, "] = ", success, ref maxLength);
success = FormatInfoUtils.TryAppendString(this, sb, FirstContainedValuePrefix, success, ref maxLength);
containedItemsFormat.IncIndentationLevel(true);
IncIndentationLevel(true);
success = success && FormatLinePrefix(sb, true, false, false, 0, ref maxLength);
containedItemsFormat.InstanceDataType = keyType;
containedItemsFormat.InstanceName = "Key";
success = success && containedItemsFormat.Format(sb, null, key[0], containedItemsFormat, ref maxLength);
DecIndentationLevel();
containedItemsFormat.DecIndentationLevel();
containedItemsFormat.IncIndentationLevel(false);
IncIndentationLevel(false);
var value = GetValue(arg, key[0]);
success = success && FormatLinePrefix(sb, false, true, false, 0, ref maxLength);
containedItemsFormat.InstanceDataType = valueType;
containedItemsFormat.InstanceName = "Value";
success = success && containedItemsFormat.Format(sb, null, value, containedItemsFormat, ref maxLength);
DecIndentationLevel();
containedItemsFormat.DecIndentationLevel();
success = FormatInfoUtils.TryAppendString(this, sb, LastContainedValueSuffix, success, ref maxLength);
key[0] = key[1];
keyFetched[0] = keyFetched[1];
if (keyFetched[0])
{
keyFetched[1] = enumerator.MoveNext();
if (keyFetched[1])
{
key[1] = enumerator.Current;
}
}
containedItemsFormat.DecIndentationLevel();
DecIndentationLevel();
}
MaximumDepth++;
} // if (MaximumDepth > 0)
success = FormatInfoUtils.TryAppendString(this, sb, LastContainedValueSuffix, success, ref maxLength);
}
PopCurrentObject();
}
else
{
success = success && FormatInfoUtils.ReportInfiniteLoop(sb, arg, InstanceName, ref maxLength);
}
if (!success)
{
sb.Length = originalLength;
}
return(success);
}
