New upstream version 1.52.1+dfsg1

[rustc.git] / vendor / rustc-ap-rustc_ast / src / node_id.rs

diff --git a/vendor/rustc-ap-rustc_ast/src/node_id.rs b/vendor/rustc-ap-rustc_ast/src/node_id.rs
new file mode 100644 (file)
index 0000000..6e7d2ba
--- /dev/null
+++ b/vendor/rustc-ap-rustc_ast/src/node_id.rs
@@ -0,0 +1,34 @@
+use rustc_span::ExpnId;
+use std::fmt;
+
+rustc_index::newtype_index! {
+    pub struct NodeId {
+        DEBUG_FORMAT = "NodeId({})"
+    }
+}
+
+rustc_data_structures::define_id_collections!(NodeMap, NodeSet, NodeId);
+
+/// `NodeId` used to represent the root of the crate.
+pub const CRATE_NODE_ID: NodeId = NodeId::from_u32(0);
+
+/// When parsing and doing expansions, we initially give all AST nodes this AST
+/// node value. Then later, during 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: ExpnId) -> Self {
+        NodeId::from_u32(expn_id.as_u32())
+    }
+
+    pub fn placeholder_to_expn_id(self) -> ExpnId {
+        ExpnId::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)
+    }
+}