35 lines
925 B
Rust
35 lines
925 B
Rust
use rustc_span::ExpnId;
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use std::fmt;
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rustc_index::newtype_index! {
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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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/// `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 doing expansions, we initially give all AST nodes this AST
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/// node value. Then later, in the renumber pass, we renumber them to have
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/// 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: ExpnId) -> 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) -> ExpnId {
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ExpnId::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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