srdf/srdf_parser/
focus_rdf.rsuse crate::{RDFParseError, SRDF};
pub trait FocusRDF: SRDF {
fn set_focus(&mut self, focus: &Self::Term);
fn get_focus(&self) -> &Option<Self::Term>;
fn get_focus_as_term(&self) -> Result<&Self::Term, RDFParseError> {
match self.get_focus() {
None => Err(RDFParseError::NoFocusNode),
Some(term) => Ok(term),
}
}
fn get_focus_as_subject(&self) -> Result<Self::Subject, RDFParseError> {
match self.get_focus() {
None => Err(RDFParseError::NoFocusNode),
Some(term) => {
Self::term_as_subject(term).ok_or_else(|| RDFParseError::ExpectedSubject {
node: format!("{term}"),
})
}
}
}
}