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use rustc_span::LocalExpnId;
use std::fmt;
rustc_index::newtype_index! {
/// Identifies an AST node.
///
/// This identifies top-level definitions, expressions, and everything in between.
/// This is later turned into [`DefId`] and `HirId` for the HIR.
///
/// [`DefId`]: rustc_span::def_id::DefId
#[debug_format = "NodeId({})"]
pub struct NodeId {}
}
rustc_data_structures::define_id_collections!(NodeMap, NodeSet, NodeMapEntry, NodeId);
/// The [`NodeId`] used to represent the root of the crate.
pub const CRATE_NODE_ID: NodeId = NodeId::from_u32(0);
/// When parsing and at the beginning of doing expansions, we initially give all AST nodes
/// this dummy AST [`NodeId`]. Then, during a later phase of expansion, we renumber them
/// to have small, positive IDs.
pub const DUMMY_NODE_ID: NodeId = NodeId::MAX;
impl NodeId {
pub fn placeholder_from_expn_id(expn_id: LocalExpnId) -> Self {
NodeId::from_u32(expn_id.as_u32())
}
pub fn placeholder_to_expn_id(self) -> LocalExpnId {
LocalExpnId::from_u32(self.as_u32())
}
}
impl fmt::Display for NodeId {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Display::fmt(&self.as_u32(), f)
}
}
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