[CanBeNull] private string Sentence([NotNull] ElizaContext ctx)
{
//Split sentence into words
var words = ctx.Input.Split(' ', StringSplitOptions.RemoveEmptyEntries);
//Check if there are any exit words, if so immediately terminate
if (words.Any(_script.Quit.Contains))
{
Finished = true;
return _script.Final.Random(_random);
}
//Get key for each word in the sentence, ordered by rank
var keys = from word in words
from key in _script.GetKeys(word)
where key != null
orderby key.Rank descending
select key;
//Get a reply for each key
var replies = from key in keys
let reply = TryKey(key, new ElizaContext(ctx, ctx.Input.PadLeft(1).PadRight(1)))
where reply != null
select reply;
//take the first non-null reply
return replies.FirstOrDefault();
}
[CanBeNull] private string ProcessSentences([NotNull] ElizaContext ctx)
{
return (from sentence in ctx.Input.Split('.', StringSplitOptions.RemoveEmptyEntries)
let transformed = new ElizaContext(ctx.Base, Transform(_script.Pre, sentence).Trim())
let r = Sentence(transformed)
where r != null
select r).FirstOrDefault();
}
[NotNull] public string ProcessInput([NotNull] ICommandContext input)
{
var ctx = new ElizaContext(input, CleanInput(input.Message.Content));
return ProcessSentences(ctx) //Try to create a reply to one of the sentences of the input
?? _mem.PopOrDefault() //Fall back to a reply we saved earlier
?? TryKey(_xnone.Random(_random), ctx) //Default reply
?? "I am at a loss for words"; //Return default default
}
/// <summary>Decompose a string according to the given key.</summary>
/// <remarks>
/// Decompose a string according to the given key. Try each decomposition
/// rule in order. If it matches, assemble a reply and return it. If assembly
/// fails, try another decomposition rule. If assembly is a goto rule, return
/// null and give the key. If assembly succeeds, return the reply;
/// </remarks>
[CanBeNull] private string TryKey([CanBeNull] Key key, ElizaContext ctx)
{
if (key == null)
return null;
//Select reassembly rules which match the input
var decompositions = from decomp in key.Decompositions
let decomposed = Patterns.Match(ctx.Input, decomp.Pattern, _script.Syns)
where decomposed != null
let rule = Task.Run(async () => await ChooseReassembly(decomp).Rule(ctx, decomposed)).Result
where !string.IsNullOrWhiteSpace(rule)
select (decomp, rule, decomposed);
foreach (var (decomposition, rule, decomposed) in decompositions)
{
//If it's a goto rule follow it
if (rule.StartsWith("goto "))
{
var gotos = _script.GetKeys(rule.Substring(5));
return (from g in gotos
orderby g.Rank descending
let r = TryKey(g, ctx)
where r != null
select r).FirstOrDefault();
}
//Try to assemble a reply using this reassembly rule
var rep = Assemble(rule, decomposed);
if (rep != null)
{
if (decomposition.Memorise)
_mem.Push(rep);
else
return rep;
}
}
return null;
}