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