public override Verb CreateVerb(string[] tokens)
{
Color(position, length, Operators);
if (GetExpression(source, NextPosition, FuncThen()) is Some <(Block, int)> e1)
{
(var condition, var i) = e1.Value;
if (GetExpression(source, i, FuncThen()) is Some <(Block, int)> e2)
{
(var thenExpression, var j) = e2.Value;
if (GetExpression(source, j, FuncEnd()) is Some <(Block, int)> e3)
{
(var elseExpression, var k) = e3.Value;
overridePosition = k;
var _if = new If(condition, thenExpression)
{
ElseBlock = elseExpression
};
return(new IfExecute(_if, VerbPresidenceType.Push));
}
}
}
return(null);
}
static (Verb, int) enclose(bool forward, Block condition, Block block, string source, int index)
{
var newCondition = forward ? condition : CodeBuilder.Not(condition);
var elseParser = new ElseParser();
var _if = new If(newCondition, block);
var overriding = index;
if (elseParser.Scan(source, index))
{
_if.ElseBlock = elseParser.Block;
overriding = elseParser.Position;
}
var ifExecute = new IfExecute(_if);
return(ifExecute, overriding);
}
public void If(Block condition, Block result, params Block[] elses)
{
var _if = new If(condition, result);
if (elses.Length > 0)
{
_if.ElseBlock = elses[0];
var current = _if;
for (var i = 1; i < elses.Length; i += 2)
{
var elseCondition = elses[i];
var elseResult = elses[i + 1];
var elseIf = new If(elseCondition, elseResult);
current.Next = elseIf;
current = elseIf;
}
}
Value(_if);
Invoke();
End();
}