internal ICommand AstToCommandResult(AstNode node)
{
switch (node.Type)
{
case AstType.Error:
throw new CommandException("Found an unconvertable ASTNode of type Error", CommandExceptionReason.InternalError);
case AstType.Command:
var cmd = (AstCommand)node;
var arguments = new ICommand[cmd.Parameter.Count];
int tailCandidates = 0;
for (int i = cmd.Parameter.Count - 1; i >= 1; i--)
{
var para = cmd.Parameter[i];
if (!(para is AstValue astVal) || astVal.StringType != StringType.FreeString)
{
break;
}
arguments[i] = new StringCommand(astVal.Value, astVal.TailString);
tailCandidates++;
}
for (int i = 0; i < cmd.Parameter.Count - tailCandidates; i++)
{
arguments[i] = AstToCommandResult(cmd.Parameter[i]);
}
return(new AppliedCommand(RootCommand, arguments));
case AstType.Value:
return(new StringCommand(((AstValue)node).Value));
default:
throw Util.UnhandledDefault(node.Type);
}
}
public override ICommandResult Execute(ExecutionInformation info, IReadOnlyList <ICommand> arguments, IReadOnlyList <CommandResultType> returnTypes)
{
if (arguments.Count == 0)
{
return(base.Execute(info, arguments, returnTypes));
}
var result = arguments[0].Execute(info, StaticList.Empty <ICommand>(), new[] { CommandResultType.Command, CommandResultType.String });
if (result.ResultType == CommandResultType.String)
{
// Use cached result so we don't execute the first argument twice
var passArgs = new ICommand[arguments.Count];
passArgs[0] = new StringCommand(((StringCommandResult)result).Content);
arguments.CopyTo(1, passArgs, 1);
return(base.Execute(info, passArgs, returnTypes));
}
return(((CommandCommandResult)result).Command.Execute(info, arguments.TrySegment(1), returnTypes));
}
