/// <summary>
/// Exit a parse tree produced by <see cref="iroParser.block"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitBlock([NotNull] iroParser.BlockContext context)
{
}
/// <summary>
/// Visit a parse tree produced by <see cref="iroParser.block"/>.
/// <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 VisitBlock([NotNull] iroParser.BlockContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Visits a top level statement containing an attribute definition or system set.
/// </summary>
public override IroVariable VisitBlock([NotNull] iroParser.BlockContext context)
{
//Prepare locals.
IroAttribute thisAttrib = null;
//System set?
if (context.sys_set() != null)
{
//Define all the sets.
var set = context.sys_set();
var setAttrib = VisitSys_set(set);
//Is it an attribute?
if (!(setAttrib is IroAttribute))
{
Error.Fatal(context, "Defined system set did not return an attribute. Please log an issue on the repository page with the source grammar.");
return(null);
}
thisAttrib = (IroAttribute)setAttrib;
}
//Is it a statement?
else if (context.statement() != null)
{
//Statement.
var stat = context.statement();
var toAdd = VisitStatement(stat);
//If anything comes back up, try to add it.
if (toAdd != null)
{
//Make sure it's an attribute so the name is there too.
if (!(toAdd is IroAttribute))
{
Error.Warn(stat, "Non-attribute variable reached the top of the stack, skipping.");
return(null);
}
//Attempt to add.
thisAttrib = (IroAttribute)toAdd;
}
}
//Unknown operation.
else
{
Error.Fatal(context, "Unknown block statement type, please submit an issue on the repository with your source grammar.");
}
//If a variable has been generated, try to add it to scope.
if (thisAttrib != null)
{
if (IroScope.VariableExists(thisAttrib.Name))
{
Error.Fatal(context, "Variable already exists with the name '" + thisAttrib.Name + "'.");
return(null);
}
IroScope.AddVariable(thisAttrib.Name, thisAttrib.Value);
}
return(null);
}
