protected override void VisitFuseExpression(FuseExpression expression)
{
CS.IndentInOut(
"FuseExpression",
() =>
{
VisitExpression(expression.Expression);
CS.If(
$"{Locals.Result}.IsSuccess",
() =>
{
using var value = Locals.Use("value");
using var node = Locals.Use("node");
CS.Ln($"{value} = string.Join(string.Empty, {Locals.Result}.Nodes.Select(n => n.Fuse()));");
CS.Ln($"{node} = Leaf.From({Locals.Result}, NodeSymbols.Fusion, {value});");
CS.Ln($"{Locals.Result} = Result.Success({Locals.Result}, {Locals.Result}.Next, {node});");
});
});
}
private static Expression Expression(INode node)
{
switch (node.Name)
{
case "sequence": return(Sequence(node));
case "choice": return(Choice(node));
case "prefix.drop": return(DropExpression.From(node[0], Expression(node[0])));
case "prefix.lift": return(LiftExpression.From(node[0], Expression(node[0])));
case "prefix.fuse": return(FuseExpression.From(node[0], Expression(node[0])));
case "prefix.not": return(NotExpression.From(node[0], Expression(node[0])));
case "suffix.zero-or-more": return(StarExpression.From(node[0], Expression(node[0])));
case "suffix.one-or-more": return(PlusExpression.From(node[0], Expression(node[0])));
case "suffix.zero-or-one": return(OptionalExpression.From(node[0], Expression(node[0])));
case "inline": return(InlineExpression.From(node[0], Tree.Rule.From(Identifier(node[0]), Expression(node[1]))));
case "identifier": return(NameExpression.From(node, Identifier(node)));
case "any": return(AnyExpression.From(node));
case "verbatim-string": return(StringLiteralExpression.From(node, ((ILeaf)node).Value));
case "character-class": return(Class(node));
case "string": return(String(node));
default:
throw new NotImplementedException();
}
}
private Expression Prefix(INode node)
{
switch (node.Name)
{
case "and":
return(AndExpression.From(node, Suffix(node[0])));
case "not":
return(NotExpression.From(node, Suffix(node[0])));
case "lift":
return(LiftExpression.From(node, Suffix(node[0])));
case "drop":
return(DropExpression.From(node, Suffix(node[0])));
case "fuse":
return(FuseExpression.From(node, Suffix(node[0])));
default:
return(Suffix(node));
}
}
protected override void VisitFuseExpression(FuseExpression expression)
{
Writer.Write($"{OpSymbols.Fuse}");
MaybeParent(expression.Expression is PrefixExpression, expression.Expression);
}
protected override void VisitFuseExpression(FuseExpression expression)
{
base.VisitFuseExpression(expression);
Push(new Fuse(Pop()));
}
protected override void VisitFuseExpression(FuseExpression expression)
{
base.VisitFuseExpression(expression);
SetNullable(expression, expression.Expression.Attr.IsNullable);
}
