public Variable AddLocal(SSLParser.VariableDefinitionContext ctx, SSLVisitor vis)
{
var v = Variable.FromContext(ctx, vis, VariableScope.Local);
if (!_scopes.Peek().TryAddVariable(v, out var error))
{
vis.Error(ctx, error);
}
return(v);
}
internal static Variable FromContext(SSLParser.VariableDefinitionContext ctx, SSLVisitor vis, VariableScope scope)
{
var name = ctx.Name.Text;
if (name[0] == '$')
{
vis.Error(ctx, "Cannot start a variable with the character '$', this is reserved for built-in variables.");
}
if (name.Length > 32)
{
vis.Error(ctx, "Variable names cannot be longer than 32 characters.");
}
var type = ReflectionUtils.TranslateTypeContext(ctx.type());
if (!type.HasValue)
{
vis.Error(ctx, $"Unable to convert variable '{name}' to internal type.");
}
if (type.Value == ShaderType.Void)
{
vis.Error(ctx, $"The variable '{name}' cannot be of type 'void'.");
}
uint?asize = null;
if (ctx.arrayIndexer() != null)
{
if (!vis.TryParseArrayIndexer(ctx.arrayIndexer(), (null, null), out var aidx, out var error))
{
vis.Error(ctx.arrayIndexer(), error);
}
if (aidx.Index2 != null)
{
vis.Error(ctx.arrayIndexer(), "Cannot declare multi-dimensional arrays.");
}
if (!aidx.Index1.GetIntegerLiteral().HasValue) // Must be a literal (OR A SPEC CONSTANT TODO)
{
vis.Error(ctx.arrayIndexer(), "Must use integer literals when declaring arrays.");
}
asize = (uint)aidx.Index1.GetIntegerLiteral().Value;
if (asize.Value > 255)
{
vis.Error(ctx.arrayIndexer(), "Cannot declare arrays larger than 255.");
}
}
return(new Variable(type.Value, name, scope, ctx.KW_CONST() != null, asize));
}
