/// <summary>
/// Appends a formatter argument to the specified output buffer.
/// </summary>
private void AppendArgument(String input, StringBuilder output, Int32 position,
ref StringFormatterArgument argument, ref StringFormatterCommandInfo cmdInfo)
{
StringFormatterArgumentHandler handler;
if (argumentHandlers.TryGetValue(argument.Type, out handler))
{
handler(this, input, output, position, ref argument, ref cmdInfo);
}
else
{
if (argument.Reference != null)
{
output.Append(argument.Reference.ToString());
}
else
{
output.Append("???");
}
}
}
/// <summary>
/// Handles <see cref="LocalizedString"/> formatter arguments.
/// </summary>
private static void ArgumentHandler_LocalizedString(StringFormatter formatter,
String input, StringBuilder output, Int32 position, ref StringFormatterArgument argument, ref StringFormatterCommandInfo cmd)
{
var localizedString = (LocalizedString)argument.Reference;
if (cmd.CommandHandler != null)
{
cmd.CommandHandler.HandleCommandLocalizedString(formatter,
output, cmd.CommandName, cmd.CommandArguments, localizedString);
}
else
{
output.Append((String)localizedString ?? "???");
}
}
/// <summary>
/// Handles <see cref="Double"/> formatter arguments.
/// </summary>
private static void ArgumentHandler_Double(StringFormatter formatter,
String input, StringBuilder output, Int32 position, ref StringFormatterArgument argument, ref StringFormatterCommandInfo cmd)
{
var raw = argument.Value;
var value = *(Double *)&raw;
if (cmd.CommandHandler != null)
{
cmd.CommandHandler.HandleCommandDouble(formatter,
output, cmd.CommandName, cmd.CommandArguments, value);
}
else
{
output.Concat((Single)value);
}
}
/// <summary>
/// Handles <see cref="Char"/> formatter arguments.
/// </summary>
private static void ArgumentHandler_Char(StringFormatter formatter,
String input, StringBuilder output, Int32 position, ref StringFormatterArgument argument, ref StringFormatterCommandInfo cmd)
{
var raw = argument.Value;
var value = *(char *)&raw;
if (cmd.CommandHandler != null)
{
cmd.CommandHandler.HandleCommandChar(formatter,
output, cmd.CommandName, cmd.CommandArguments, value);
}
else
{
output.Append(value);
}
}
/// <summary>
/// Handles <see cref="Boolean"/> formatter arguments.
/// </summary>
private static void ArgumentHandler_Boolean(StringFormatter formatter,
String input, StringBuilder output, Int32 position, ref StringFormatterArgument argument, ref StringFormatterCommandInfo cmd)
{
var raw = argument.Value;
var value = *(bool *)&raw;
if (cmd.CommandHandler != null)
{
cmd.CommandHandler.HandleCommandBoolean(formatter,
output, cmd.CommandName, cmd.CommandArguments, value);
}
else
{
output.Append(value ? Boolean.TrueString : Boolean.FalseString);
}
}
/// <summary>
/// Attempts to process a format specifier.
/// </summary>
/// <param name="input">The input string.</param>
/// <param name="output">The output buffer.</param>
/// <param name="ix">The index at which the specifier begins.</param>
/// <param name="length">The length of the specifier.</param>
private void ProcessFormatSpecifier(String input, StringBuilder output, Int32 ix, Int32 length)
{
// Parse the command string to pull out its name and arguments.
var argument = default(StringFormatterArgument);
var cmdStart = ix + 1;
var cmdLength = 0;
for (int i = 1; i < length; i++)
{
var c = input[ix + i];
if (c == '}')
{
break;
}
cmdLength++;
}
var cmdName = default(StringSegment);
var cmdArgs = new StringFormatterCommandArguments(input, cmdStart, cmdLength);
var arg0 = cmdArgs.GetArgument(0);
var arg0Text = arg0.Text;
var arg0Value = 0;
var arg0ValueIsInteger = arg0.TryGetValueAsInt32(out arg0Value);
// If the command starts with a reference to an argument, parse
// that out so we can get at the command name.
var referencesGenerated = arg0Text == "?";
var referencesArgument = referencesGenerated || arg0ValueIsInteger;
if (referencesArgument)
{
if (cmdArgs.Count > 1)
{
cmdName = cmdArgs.GetArgument(1).Text;
cmdArgs = cmdArgs.Discard(2);
}
}
else
{
cmdName = arg0Text;
cmdArgs = cmdArgs.Discard(1);
}
// Determine if we have a custom handler for this command.
var matchingCommandHandler = default(StringFormatterCommandHandler);
if (!cmdName.IsEmpty)
{
for (int i = commandHandlers.Count - 1; i >= 0; i--)
{
var commandHandler = commandHandlers[i];
if (commandHandler.CanHandleCommand(cmdName))
{
matchingCommandHandler = commandHandler;
break;
}
}
if (matchingCommandHandler == null)
{
throw new FormatException(CoreStrings.FmtCmdUnrecognized.Format(cmdName));
}
}
// If we can't convert the first argument to an integer, just write out the whole command string.
if (!referencesArgument)
{
if (matchingCommandHandler != null)
{
matchingCommandHandler.HandleCommand(this, output, cmdName, cmdArgs);
return;
}
output.AppendSubstring(input, ix, length);
return;
}
// Append the selected argument to the buffer.
var cmdInfo = new StringFormatterCommandInfo(cmdName, cmdArgs, matchingCommandHandler);
if (referencesGenerated)
{
argument = new StringFormatterArgument();
ArgumentHandler_LocalizedString(this,
input, output, arg0Text.Start + arg0Text.Length, ref argument, ref cmdInfo);
}
else
{
argument = GetArgument(arg0Value);
AppendArgument(input, output, arg0Text.Start + arg0Text.Length, ref argument, ref cmdInfo);
}
}