public Value ApplyWhile()
{
var argument = Arguments.ApplyValue;
var variable = Arguments.ApplyVariable;
State.PushPatternManager();
State.Multi = true;
var isVariable = variable != null;
var isReadOnly = isVariable && Regions.IsReadOnly(variable.Name);
var array = new Array();
string input;
switch (argument)
{
case PatternResult patternResult when patternResult.Success:
input = patternResult.Text;
variable = patternResult.Variable;
isVariable = variable != null;
break;
case PatternResult _:
return(PatternResult.Falure());
default:
input = argument.Text;
break;
}
var oneSuccess = false;
for (var i = 0; i < MAX_LOOP && withinLimit(i); i++)
{
if (Scan(input))
{
State.Alternates.Clear();
if (withinNth(i))
{
oneSuccess = true;
}
}
else
{
break;
}
input = State.Input;
if (isReadOnly)
{
array.Add(input.Skip(startIndex).Take(stopIndex - startIndex));
}
}
if (isReadOnly)
{
State.PopPatternManager();
return(oneSuccess ? array : new Array());
}
var result = oneSuccess ? new PatternResult
{
Input = input,
Text = State.Input.Copy(),
Value = argument,
Success = true,
StartIndex = startIndex,
StopIndex = stopIndex,
Variable = variable
} : PatternResult.Falure();
if (isVariable && result.IsTrue)
{
variable.Value = State.Input.Copy();
}
if (State.Result != null)
{
var managerResult = State.Result;
State.Result = null;
State.PopPatternManager();
return(managerResult);
}
State.PopPatternManager();
return(result);
}
public Value Apply()
{
var argument = Arguments.ApplyValue;
var variable = Arguments.ApplyVariable;
State.PushPatternManager();
var isVariable = variable != null;
var isReadOnly = isVariable && Regions.IsReadOnly(variable.Name) || !isVariable;
string input;
if (argument is PatternResult patternResult)
{
if (patternResult.Success)
{
input = patternResult.Text;
variable = patternResult.Variable;
isVariable = variable != null;
}
else
{
return(PatternResult.Falure());
}
}
else
{
input = argument.Text;
}
var matched = Scan(input);
var text = State.Input.Copy();
if (isReadOnly)
{
State.PopPatternManager();
return(matched ? (Value) new Some(text.Skip(startIndex).Take(stopIndex - startIndex)) : new None());
}
var result = matched ? new PatternResult
{
Input = input,
Text = text,
Value = argument,
Success = true,
StartIndex = startIndex,
StopIndex = stopIndex,
Variable = variable
} : PatternResult.Falure();
if (isVariable && result.IsTrue)
{
variable.Value = text;
}
if (State.Result != null)
{
var managerResult = State.Result;
State.Result = null;
State.PopPatternManager();
return(managerResult);
}
State.PopPatternManager();
return(result);
}