public void Dispatch(string input)
{
// Skip blank lines.
if (string.IsNullOrWhiteSpace(input))
return;
// Split into tokens by whitespace.
var tokens = input.Split();
// Command name is first token.
ICommand command;
if (!commandRegistry.TryGetCommand(tokens[0], out command))
{
output.WriteLine(Purpose.Error, "Unrecognized command \"{0}\".", tokens[0]);
return;
}
// Feed args to command.
var context = new LoadParamsContext(tokens, 1, tokens.Length - 1);
command.LoadParams(context);
if (context.Failed)
{
output.WriteLine(
Purpose.Error,
"Invalid args \"{0}\" for command \"{1}\"",
input,
command.Usage);
using (output.Indent())
{
foreach (var error in context.Errors)
output.WriteLine(Purpose.Error, "- {0}", error);
}
return;
}
// Execute.
messageBoard.Send(command);
}
protected static void OptionalResourceName(LoadParamsContext context, int index, out string resourceName)
{
resourceName = null;
if (context.TokenCount <= index)
return;
if (string.IsNullOrWhiteSpace(context[index]))
context.ReportError("Resource name cannot be empty.");
else
resourceName = context[index];
}
protected static void OptionalProcessName(LoadParamsContext context, int index, out string processName, bool singleCharNamesOnly = true)
{
processName = null;
if (context.TokenCount <= index)
return;
if (string.IsNullOrWhiteSpace(context[index]))
context.ReportError("Process name cannot be empty.");
else if (singleCharNamesOnly && new StringInfo(context[index]).LengthInTextElements > 1)
context.ReportError("Process name can be at most 1 character.");
else
processName = context[index];
}
protected static void RequiredCount(LoadParamsContext context, int index, out int count)
{
if (context.TokenCount <= index)
count = 1; // Default value if not provided instead of error.
else if (!int.TryParse(context[index], NumberStyles.None, CultureInfo.InvariantCulture, out count))
context.ReportError("Failed to parse count as an integer value.");
else if (count < 1)
context.ReportError("Count cannot be less than 1.");
}
public abstract void LoadParams(LoadParamsContext context);
public override void LoadParams(LoadParamsContext context)
{
}
public override void LoadParams(LoadParamsContext context)
{
OptionalResourceName(context, 0, out resourceName);
}
public override void LoadParams(LoadParamsContext context)
{
OptionalProcessName(context, 0, out processName, false);
}
public override void LoadParams(LoadParamsContext context)
{
RequiredResourceName(context, 0, out resourceName);
RequiredCount(context, 1, out count);
}
public override void LoadParams(LoadParamsContext context)
{
RequiredProcessName(context, 0, out processName);
}
protected static void RequiredResourceName(LoadParamsContext context, int index, out string resourceName)
{
resourceName = null;
if (context.TokenCount <= index)
context.ReportError("No argument provided for resource name.");
else if (string.IsNullOrWhiteSpace(context[index]))
context.ReportError("Resource name cannot be empty.");
else
resourceName = context[index];
}
protected static void RequiredPriority(LoadParamsContext context, int index, out int priority)
{
priority = 0;
if (context.TokenCount <= index)
context.ReportError("No argument provided for priority.");
else if (!int.TryParse(context[index], NumberStyles.None, CultureInfo.InvariantCulture, out priority))
context.ReportError("Failed to parse priority as an integer value.");
else if (priority != 1 && priority != 2)
context.ReportError("Invalid priority, must be 1 or 2.");
}