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//! Proc Macro Expander stub
use crate::{db::AstDatabase, LazyMacroId};
use ra_db::{CrateId, ProcMacroId};
#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
pub struct ProcMacroExpander {
krate: CrateId,
proc_macro_id: ProcMacroId,
}
impl ProcMacroExpander {
pub fn new(krate: CrateId, proc_macro_id: ProcMacroId) -> ProcMacroExpander {
ProcMacroExpander { krate, proc_macro_id }
}
pub fn expand(
&self,
db: &dyn AstDatabase,
_id: LazyMacroId,
tt: &tt::Subtree,
) -> Result<tt::Subtree, mbe::ExpandError> {
let krate_graph = db.crate_graph();
let proc_macro = krate_graph[self.krate]
.proc_macro
.get(self.proc_macro_id.0 as usize)
.clone()
.ok_or_else(|| mbe::ExpandError::ConversionError)?;
proc_macro.expander.expand(&tt, None).map_err(mbe::ExpandError::from)
}
}
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