-%% \ltj@safe@glue{<glue>}
-%! グルー値.
-% For a glue. The result is a gluespec object.
-\def\ltj@safe@glue{
- \ltj@safe@glue@or\ltj@safe@invalid
-}
-\def\ltj@safe@glue@or#1#2{
- \expandafter\expandafter\expandafter\ltj@@safe@glueA
- \ltj@gobble@glue#2\ltj@@safe@end{#2}{#1}
-}
-\def\ltj@@safe@glueA#1\ltj@@safe@end#2#3{
- \ltj@if@blank{#1}{
- (luatexja.base.to_skip("\the\glueexpr#2\relax"))
- }{
- #3
- }
-}
-