public OptionLink(YarnSpinnerV1Parser.OptionLinkContext context)
: this()
{
this.Context = context;
this.Conditions = new List <(YarnSpinnerV1Parser.ExpressionContext expression, bool requiredTruthValue)>();
}
/// <summary>
/// Exit a parse tree produced by the <c>OptionLink</c>
/// labeled alternative in <see cref="YarnSpinnerV1Parser.option_statement"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitOptionLink([NotNull] YarnSpinnerV1Parser.OptionLinkContext context)
{
}
public override int VisitOptionLink([NotNull] YarnSpinnerV1Parser.OptionLinkContext context)
{
var link = new OptionLink(context);
// Walk up the tree until we hit a NodeContext, looking for
// if-clauses, else-if clauses, and end-if clauses.
var parent = context.Parent;
while (parent != null && parent is YarnSpinnerV1Parser.NodeContext == false)
{
if (parent is YarnSpinnerV1Parser.If_clauseContext ifClause)
{
// The option is inside an 'if' clause. The
// expression must evaluate to true in order for
// this option to run.
link.Conditions.Add((ifClause.expression(), true));
}
else if (parent is YarnSpinnerV1Parser.Else_if_clauseContext elseIfContext)
{
// The option is inside an 'else if' clause. The
// expression must evaluate to true, and all of the
// preceding if and else-if clauses in this if
// statement must evaluate to false, in order for
// this option to run.
link.Conditions.Add((elseIfContext.expression(), true));
var parentIfClause = elseIfContext.Parent as YarnSpinnerV1Parser.If_statementContext;
foreach (var siblingClause in parentIfClause.children)
{
// Stop if we've reached ourself
if (siblingClause == elseIfContext)
{
break;
}
switch (siblingClause)
{
case YarnSpinnerV1Parser.If_clauseContext siblingIfClause:
link.Conditions.Add((siblingIfClause.expression(), false));
break;
case YarnSpinnerV1Parser.Else_if_clauseContext siblingElseIfClause:
link.Conditions.Add((siblingElseIfClause.expression(), false));
break;
}
}
}
else if (parent is YarnSpinnerV1Parser.Else_clauseContext elseContext)
{
// The option is inside an 'else' clause. All of the
// preceding if and else-if clauses in this if
// statement must evaluate to false, in order for
// this option to run.
var parentIfClause = elseContext.Parent as YarnSpinnerV1Parser.If_statementContext;
foreach (var siblingClause in parentIfClause.children)
{
// Stop if we've hit ourself (probably not an
// issue since an else statement occurs at the
// end anyway, but good to check imo)
if (siblingClause == elseContext)
{
break;
}
switch (siblingClause)
{
case YarnSpinnerV1Parser.If_clauseContext siblingIfClause:
link.Conditions.Add((siblingIfClause.expression(), false));
break;
case YarnSpinnerV1Parser.Else_if_clauseContext siblingElseIfClause:
link.Conditions.Add((siblingElseIfClause.expression(), false));
break;
}
}
}
// Step up the tree
parent = parent.Parent;
}
this.currentNodeOptionLinks.Add(link);
return(base.VisitOptionLink(context));
}
/// <summary>
/// Visit a parse tree produced by the <c>OptionLink</c>
/// labeled alternative in <see cref="YarnSpinnerV1Parser.option_statement"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitOptionLink([NotNull] YarnSpinnerV1Parser.OptionLinkContext context)
{
return(VisitChildren(context));
}
