protected bool needRemoval; // true to strip off first element of matcher
#endregion Fields
#region Constructors
public StarEater(Coderack coderack, double salience, Matcher matcher, string name, bool needRemoval)
: base(coderack, salience, 0, 10)
{
this.matcher = matcher;
this.name = name;
this.needRemoval = needRemoval;
}
public static Evaluator MakeMatcherContinue(double salience, Context context, IParsedPhrase input, List<IParsedPhrase> unmatched, IContinuation succ)
{
context.Map["$check"] = null;
// Match this to first constituent, the continue for others
Matcher matcheval = new Matcher(salience, input, unmatched, succ);
ContinuationAppender appender = new ContinuationAppender(context, matcheval);
Evaluator eval = new Evaluator(salience, ArgumentMode.SingleArgument, appender.AsIndex(0), appender.AsIndex(1), true);
return eval;
}
public override bool Evaluate()
{
List<IContent> contents = context.Contents;
if (contents.Count == 0) {
Unilog.Notice(this, "Ran out of template before input");
fail.Fail("Ran out of tokens before matched all input", succ);
return true;
}
// Does our first element match the whole thing?
IContent first = contents[0];
//Console.WriteLine("Match " + first.Name + " against " + input.Text + " + " + unmatched.Count);
// always consider dropping interjections
IFailure myfail = fail;
if (input.Part == "UH")
{
IFailure skipfail;
if (unmatched.Count == 0)
{
// then fail becomes success!
skipfail = new ContinueCodelet(salience, context, succ, fail);
}
else
{
Matcher matchskip = new Matcher(salience, unmatched[0], unmatched.GetRange(1, unmatched.Count - 1), succ);
skipfail = new ContinueCodelet(salience, context, matchskip, fail);
}
myfail = skipfail;
}
if (first.Name == "*")
{
// Failure state has the first POS eaten by the star
StarEater eater = new StarEater(coderack, salience, this, StarUtilities.NextStarName(context, "*"), true);
if (context.Contents.Count == 1)
{
// We ran out elements, but we still have some unmatched
coderack.AddCodelet(eater, "Evaluate *");
return true;
}
else
{
MatchAgainst(salience, context.ChildRange(1), input, unmatched, succ, eater);
return true;
}
}
else if (first.Name == "_")
{
StarEater eater = new StarEater(coderack, salience, this, StarUtilities.NextStarName(context, "_"), true);
coderack.AddCodelet(eater, "Evaluate _");
return true;
}
else if (first.Name == "%opt")
{
// Try with, and if that fails, do without
int end = context.Contents.IndexOf(Special.EndDelimSpecial);
if (end == -1) {
// It's all optional-- but on fail return to match to ensure blank
Context without = new Context(context, new List<IContent>());
Evaluator evalfail = MakeMatcherContinue(salience, without, input, unmatched, succ);
IFailure withoutfail = new ContinueCodelet(salience, without, evalfail, myfail);
Context with = new Context(context, context.Contents.GetRange(1, context.Contents.Count - 1));
Matcher.MatchAgainst(salience, with, input, unmatched, succ, withoutfail);
} else {
Context without = new Context(context, context.Contents.GetRange(end + 1, context.Contents.Count - (end + 1)));
Evaluator evalfail = MakeMatcherContinue(salience, without, input, unmatched, succ);
IFailure withoutfail = new ContinueCodelet(salience, without, evalfail, myfail);
Context with = new Context(context, context.Contents.GetRange(1, end - 1));
with.Contents.AddRange(without.Contents);
Matcher.MatchAgainst(salience, with, input, unmatched, succ, withoutfail);
}
return true;
}
else if (first is Variable)
{
if (((Variable)first).Match(context, input))
{
ContinueNextUnmatched(context.ChildRange(1));
return true;
}
else if (input.IsLeaf)
{
// we didn't match-- fail!
Unilog.Notice(this, first.Name + " does not match " + input.Text);
fail.Fail("Initial variable didn't match", succ);
return true;
}
else
{
GroupPhrase groupPhrase = new GroupPhrase(input);
unmatched.InsertRange(0, groupPhrase.GetRange(1));
// Call again with the same evaluated first argument
Matcher matchrest = new Matcher(salience, groupPhrase.GetBranch(0), unmatched, succ);
matchrest.Continue(context, myfail);
return true;
}
}
else if (first is Value && ((Value) first).Data is MatchProduceAgent)
{
IContinuation mysucc = succ;
// Check if we have values to match later
if (unmatched.Count != 0)
mysucc = MakeNextUnmatchedContinue(mysucc);
ContextAppender appender = new ContextAppender(salience, context, -1, mysucc);
MatchProduceAgent agent = (MatchProduceAgent)((Value) first).Data;
context.Map["$check"] = input;
ContinueToCallAgent codelet = new ContinueToCallAgent(agent, appender);
IFailure deepenfail = myfail;
if (!input.IsLeaf) {
// Continue to deeper
GroupPhrase groupPhrase = new GroupPhrase(input);
unmatched.InsertRange(0, groupPhrase.GetRange(1));
// Call again with the same evaluated first argument
Matcher matchrest = new Matcher(salience, groupPhrase.GetBranch(0), unmatched, succ);
deepenfail = new FailToContinue(context, matchrest, myfail);
}
codelet.Continue(context, deepenfail);
return true;
}
if (first is Word && input.IsLeaf)
{
WordComparer comparer = (WordComparer) context.LookupSimple("$Compare");
if (comparer.Match(input.Text, first.Name))
{
ContinueNextUnmatched(context.ChildRange(1));
return true;
}
else
{
// failure!
fail.Fail(string.Format("Pattern [{0}] does not match [{1}]", first.Name, input.Text), succ);
return true;
}
} else if (first is Word) {
GroupPhrase groupPhrase = new GroupPhrase(input);
unmatched.InsertRange(0, groupPhrase.GetRange(1));
Matcher matchcont = new Matcher(salience, groupPhrase.GetBranch(0), unmatched, succ);
matchcont.Continue(context, myfail);
return true;
}
// We can't handle this! fail
fail.Fail("Unknown first element", succ);
return true;
}
