commit before travel

orchid-base/src/parse.rs

@@ -10,8 +10,8 @@ use crate::api;
 use crate::error::{OrcRes, Reporter, mk_err, mk_errv};
 use crate::format::fmt;
 use crate::interner::{Interner, Tok};
-use crate::location::{Pos, SrcRange};
-use crate::name::{VName, VPath};
+use crate::location::SrcRange;
+use crate::name::{Sym, VName, VPath};
 use crate::tree::{ExprRepr, ExtraTok, Paren, TokTree, Token, ttv_range};
 
 pub trait ParseCtx {
@@ -110,24 +110,24 @@ pub fn strip_fluff<A: ExprRepr, X: ExtraTok>(tt: &TokTree<A, X>) -> Option<TokTr
 #[derive(Clone, Debug)]
 pub struct Comment {
 	pub text: Tok<String>,
-	pub range: Range<u32>,
+	pub sr: SrcRange,
 }
 impl Comment {
 	// XXX: which of these four are actually used?
-	pub async fn from_api(c: &api::Comment, i: &Interner) -> Self {
-		Self { text: i.ex(c.text).await, range: c.range.clone() }
+	pub async fn from_api(c: &api::Comment, src: Sym, i: &Interner) -> Self {
+		Self { text: i.ex(c.text).await, sr: SrcRange::new(c.range.clone(), &src) }
 	}
 	pub async fn from_tk(tk: &TokTree<impl ExprRepr, impl ExtraTok>, i: &Interner) -> Option<Self> {
 		match &tk.tok {
-			Token::Comment(text) => Some(Self { text: i.i(&**text).await, range: tk.range.clone() }),
+			Token::Comment(text) => Some(Self { text: i.i(&**text).await, sr: tk.sr.clone() }),
 			_ => None,
 		}
 	}
 	pub fn to_tk<R: ExprRepr, X: ExtraTok>(&self) -> TokTree<R, X> {
-		TokTree { tok: Token::Comment(self.text.rc().clone()), range: self.range.clone() }
+		TokTree { tok: Token::Comment(self.text.rc().clone()), sr: self.sr.clone() }
 	}
 	pub fn to_api(&self) -> api::Comment {
-		api::Comment { range: self.range.clone(), text: self.text.to_api() }
+		api::Comment { range: self.sr.range(), text: self.text.to_api() }
 	}
 }
 

orchid-extension/src/entrypoint.rs

@@ -299,7 +299,8 @@ pub fn extension_init(
 							let mut ctx = get_ctx(*sys).await;
 							let parsers = ctx.cted().inst().dyn_parsers();
 							let src = Sym::from_api(*src, ctx.i()).await;
-							let comments = join_all(comments.iter().map(|c| Comment::from_api(c, &i))).await;
+							let comments =
+								join_all(comments.iter().map(|c| Comment::from_api(c, src.clone(), &i))).await;
 							let line: Vec<GenTokTree> = ttv_from_api(line, &mut ctx, &mut (), &src, &i).await;
 							let snip = Snippet::new(line.first().expect("Empty line"), &line);
 							let (head, tail) = snip.pop_front().unwrap();

orchid-host/src/dealias.rs

@@ -1,3 +1,5 @@
+use std::collections::VecDeque;
+
 use futures::FutureExt;
 use hashbrown::{HashMap, HashSet};
 use itertools::{Either, Itertools};
@@ -8,7 +10,7 @@ use orchid_base::name::{NameLike, Sym, VName};
 use substack::Substack;
 
 use crate::expr::Expr;
-use crate::parsed::{ItemKind, ParsedMemberKind, ParsedModule, WalkErrorKind};
+use crate::parsed::{ItemKind, ParsedMemberKind, ParsedModule};
 
 /// Errors produced by absolute_path
 #[derive(Clone, Debug, Hash, PartialEq, Eq)]
@@ -74,129 +76,87 @@ pub fn absolute_path(
 pub struct DealiasCtx<'a> {
 	pub i: &'a Interner,
 	pub rep: &'a Reporter,
-	pub consts: &'a mut HashMap<Sym, Expr>,
 }
 
-pub async fn resolv_glob(
+pub async fn resolv_glob<Mod: Tree>(
 	cwd: &[Tok<String>],
-	root: &ParsedModule,
+	root: &Mod,
 	abs_path: &[Tok<String>],
 	pos: Pos,
-	ctx: &mut DealiasCtx<'_>,
+	i: &Interner,
+	rep: &Reporter,
+	walk_cx: &mut Mod::Ctx,
 ) -> Vec<Tok<String>> {
 	let coprefix_len = cwd.iter().zip(abs_path).take_while(|(a, b)| a == b).count();
 	let (co_prefix, diff_path) = abs_path.split_at(coprefix_len);
 	let co_parent =
-		root.walk(false, co_prefix.iter().cloned(), ctx.consts).await.expect("Invalid step in cwd");
-	let target_module = match co_parent.walk(true, diff_path.iter().cloned(), ctx.consts).await {
+		root.walk(true, co_prefix.iter().cloned(), walk_cx).await.expect("Invalid step in cwd");
+	let target_module = match co_parent.walk(false, diff_path.iter().cloned(), walk_cx).await {
 		Ok(t) => t,
 		Err(e) => {
 			let path = abs_path[..=coprefix_len + e.pos].iter().join("::");
 			let (tk, msg) = match e.kind {
-				WalkErrorKind::Constant =>
-					(ctx.i.i("Invalid import path").await, format!("{path} is a constant")),
-				WalkErrorKind::Missing =>
-					(ctx.i.i("Invalid import path").await, format!("{path} not found")),
-				WalkErrorKind::Private =>
-					(ctx.i.i("Import inaccessible").await, format!("{path} is private")),
+				ChildErrorKind::Constant =>
+					(i.i("Invalid import path").await, format!("{path} is a const")),
+				ChildErrorKind::Missing => (i.i("Invalid import path").await, format!("{path} not found")),
+				ChildErrorKind::Private => (i.i("Import inaccessible").await, format!("{path} is private")),
 			};
-			(&ctx.rep).report(mk_err(tk, msg, [pos.into()]));
+			rep.report(mk_err(tk, msg, [pos.into()]));
 			return vec![];
 		},
 	};
-	target_module.exports.clone()
+	target_module.children(false)
 }
 
-/// Read import statements and convert them into aliases, rasising any import
-/// errors in the process
-pub async fn imports_to_aliases(
-	module: &ParsedModule,
-	cwd: &mut Vec<Tok<String>>,
-	root: &ParsedModule,
-	alias_map: &mut HashMap<Sym, Sym>,
-	alias_rev_map: &mut HashMap<Sym, HashSet<Sym>>,
-	ctx: &mut DealiasCtx<'_>,
-) {
-	let mut import_locs = HashMap::<Sym, Vec<Pos>>::new();
-	for item in &module.items {
-		match &item.kind {
-			ItemKind::Import(imp) => match absolute_path(cwd, &imp.path) {
-				Err(e) =>
-					ctx.rep.report(e.err_obj(ctx.i, item.sr.pos(), &imp.path.iter().join("::")).await),
-				Ok(abs_path) => {
-					let names = match imp.name.as_ref() {
-						Some(n) => Either::Right([n.clone()].into_iter()),
-						None =>
-							Either::Left(resolv_glob(cwd, root, &abs_path, item.sr.pos(), ctx).await.into_iter()),
-					};
-					for name in names {
-						let mut tgt = abs_path.clone().suffix([name.clone()]).to_sym(ctx.i).await;
-						let src = Sym::new(cwd.iter().cloned().chain([name]), ctx.i).await.unwrap();
-						import_locs.entry(src.clone()).or_insert(vec![]).push(item.sr.pos());
-						if let Some(tgt2) = alias_map.get(&tgt) {
-							tgt = tgt2.clone();
+pub enum ChildResult<'a, T: Tree + ?Sized> {
+	Value(&'a T),
+	Err(ChildErrorKind),
+	Alias(&'a [Tok<String>]),
 }
-						if src == tgt {
-							ctx.rep.report(mk_err(
-								ctx.i.i("Circular references").await,
-								format!("{src} circularly refers to itself"),
-								[item.sr.pos().into()],
-							));
-							continue;
-						}
-						if let Some(fst_val) = alias_map.get(&src) {
-							let locations = (import_locs.get(&src))
-								.expect("The same name could only have appeared in the same module");
-							ctx.rep.report(mk_err(
-								ctx.i.i("Conflicting imports").await,
-								if fst_val == &src {
-									format!("{src} is imported multiple times")
-								} else {
-									format!("{} could refer to both {fst_val} and {src}", src.last())
-								},
-								locations.iter().map(|p| p.clone().into()).collect_vec(),
-							))
-						}
-						let mut srcv = vec![src.clone()];
-						if let Some(src_extra) = alias_rev_map.remove(&src) {
-							srcv.extend(src_extra);
-						}
-						for src in srcv {
-							alias_map.insert(src.clone(), tgt.clone());
-							alias_rev_map.entry(tgt.clone()).or_insert(HashSet::new()).insert(src);
-						}
-					}
-				},
-			},
-			ItemKind::Member(mem) => match mem.kind(ctx.consts).await {
-				ParsedMemberKind::Const => (),
-				ParsedMemberKind::Mod(m) => {
-					cwd.push(mem.name());
-					imports_to_aliases(m, cwd, root, alias_map, alias_rev_map, ctx).boxed_local().await;
-					cwd.pop();
-				},
-			},
-			ItemKind::Export(_) => (),
+pub trait Tree {
+	type Ctx;
+	fn children(&self, public_only: bool) -> HashSet<Tok<String>>;
+	fn child(&self, key: Tok<String>, public_only: bool) -> ChildResult<'_, Self>;
 }
+#[derive(Clone, Debug, Hash, PartialEq, Eq)]
+pub enum ChildErrorKind {
+	Missing,
+	Private,
+	Constant,
 }
+#[derive(Clone, Debug, Hash, PartialEq, Eq)]
+pub struct ChildError {
+	pub at_path: Vec<Tok<String>>,
+	pub kind: ChildErrorKind,
 }
 
-pub async fn dealias(
-	path: Substack<'_, Tok<String>>,
-	module: &mut ParsedModule,
-	alias_map: &HashMap<Sym, Sym>,
-	ctx: &mut DealiasCtx<'_>,
-) {
-	for item in &mut module.items {
-		match &mut item.kind {
-			ItemKind::Export(_) | ItemKind::Import(_) => (),
-			ItemKind::Member(mem) => {
-				let path = path.push(mem.name());
-				match mem.kind_mut(ctx.consts).await {
-					ParsedMemberKind::Const => (),
-					ParsedMemberKind::Mod(m) => dealias(path, m, alias_map, ctx).boxed_local().await,
-				}
+// Problem: walk should take into account aliases and visibility
+//
+// help: since every alias is also its own import, visibility only has to be
+// checked on the top level
+//
+// idea: do a simple stack machine like below with no visibility for aliases and
+// call it from an access-checking implementation for just the top level
+//
+// caveat: we need to check EVERY IMPORT to ensure that all
+// errors are raised
+
+fn walk_no_access_chk<T: Tree>(
+	root: &T,
+	path: impl IntoIterator<Item = Tok<String>>,
+) -> Result<&T, ChildError> {
+	let mut cur = root;
+	let mut cur_path = Vec::new();
+	let mut path = VecDeque::from(path);
+	while let Some(step) = path.pop_front() {
+		match cur.child(step, false) {
+			ChildResult::Alias(target) => {
+				path.reserve(target.len());
+				target.iter().rev().for_each(|tok| path.push_front(tok.clone()));
+				cur = root;
+				cur_path = Vec::new();
 			},
+			ChildResult::Err(e) => return Err(ChildError { pos: (), kind: () }),
 		}
 	}
 }

orchid-host/src/lex.rs

@@ -150,11 +150,11 @@ pub async fn lex_once(ctx: &mut LexCtx<'_>) -> OrcRes<ParsTokTree> {
 		for sys in ctx.systems {
 			let mut errors = Vec::new();
 			if ctx.tail.starts_with(|c| sys.can_lex(c)) {
-				let (source, pos) = (ctx.source.clone(), ctx.get_pos());
+				let (source, pos, path) = (ctx.source.clone(), ctx.get_pos(), ctx.path.clone());
 				let ctx_lck = &Mutex::new(&mut *ctx);
 				let errors_lck = &Mutex::new(&mut errors);
 				let lx = sys
-					.lex(source, pos, |pos| async move {
+					.lex(source, path, pos, |pos| async move {
 						let mut ctx_g = ctx_lck.lock().await;
 						match lex_once(&mut ctx_g.push(pos)).boxed_local().await {
 							Ok(t) => Some(api::SubLexed { pos: t.sr.end(), tree: ctx_g.ser_subtree(t).await }),

orchid-host/src/parsed.rs

@@ -6,7 +6,7 @@ use async_std::sync::{Mutex, RwLock};
 use async_stream::stream;
 use futures::future::join_all;
 use futures::{FutureExt, StreamExt};
-use hashbrown::HashMap;
+use hashbrown::{HashMap, HashSet};
 use itertools::Itertools;
 use orchid_base::error::{OrcRes, mk_errv};
 use orchid_base::format::{FmtCtx, FmtUnit, Format, Variants};
@@ -61,18 +61,6 @@ impl TokenVariant<api::Expression> for Expr {
 	}
 }
 
-pub struct ParsedFromApiCx<'a> {
-	pub sys: &'a System,
-	pub consts: &'a mut HashMap<Sym, Expr>,
-	pub path: Tok<Vec<Tok<String>>>,
-}
-impl<'a> ParsedFromApiCx<'a> {
-	pub async fn push<'c>(&'c mut self, name: Tok<String>) -> ParsedFromApiCx<'c> {
-		let path = self.sys.ctx().i.i(&self.path.iter().cloned().chain([name]).collect_vec()).await;
-		ParsedFromApiCx { path, consts: &mut *self.consts, sys: self.sys }
-	}
-}
-
 #[derive(Debug)]
 pub struct Item {
 	pub sr: SrcRange,
@@ -154,11 +142,19 @@ impl ParsedModule {
 		std::mem::swap(self, &mut swap);
 		*self = ParsedModule::new(swap.items.into_iter().chain(other.items))
 	}
-	pub async fn walk<'a>(
+	pub fn get_imports(&self) -> impl IntoIterator<Item = &Import> {
+		(self.items.iter())
+			.filter_map(|it| if let ItemKind::Import(i) = &it.kind { Some(i) } else { None })
+	}
+}
+impl Tree for ParsedModule {
+	type Ctx = ();
+	async fn walk<I: IntoIterator<Item = Tok<String>>>(
 		&self,
-		allow_private: bool,
-		path: impl IntoIterator<Item = Tok<String>>,
-	) -> Result<&ParsedModule, WalkError> {
+		public_only: bool,
+		path: I,
+		_ctx: &'_ mut Self::Ctx,
+	) -> Result<&Self, WalkError> {
 		let mut cur = self;
 		for (pos, step) in path.into_iter().enumerate() {
 			let Some(member) = (cur.items.iter())
@@ -167,7 +163,7 @@ impl ParsedModule {
 			else {
 				return Err(WalkError { pos, kind: WalkErrorKind::Missing });
 			};
-			if !allow_private && !cur.exports.contains(&step) {
+			if public_only && !cur.exports.contains(&step) {
 				return Err(WalkError { pos, kind: WalkErrorKind::Private });
 			}
 			match &member.kind {
@@ -177,21 +173,19 @@ impl ParsedModule {
 		}
 		Ok(cur)
 	}
-	pub fn get_imports(&self) -> impl IntoIterator<Item = &Import> {
+	fn children(&self, public_only: bool) -> HashSet<Tok<String>> {
+		let mut public: HashSet<_> = self.exports.iter().cloned().collect();
+		if !public_only {
+			public.extend(
 				(self.items.iter())
-			.filter_map(|it| if let ItemKind::Import(i) = &it.kind { Some(i) } else { None })
+					.filter_map(
+						|it| if let ItemKind::Member(mem) = &it.kind { Some(&mem.name) } else { None },
+					)
+					.cloned(),
+			)
 		}
+		public
 	}
-#[derive(Clone, Debug, Hash, PartialEq, Eq)]
-pub enum WalkErrorKind {
-	Missing,
-	Private,
-	Constant,
-}
-#[derive(Clone, Debug, Hash, PartialEq, Eq)]
-pub struct WalkError {
-	pub pos: usize,
-	pub kind: WalkErrorKind,
 }
 impl Format for ParsedModule {
 	async fn print<'a>(&'a self, c: &'a (impl FmtCtx + ?Sized + 'a)) -> FmtUnit {
@@ -237,7 +231,7 @@ impl Root {
 			return Ok(val.clone());
 		}
 		let (cn, mp) = name.split_last();
-		let module = self.tree.walk(true, mp.iter().cloned()).await.unwrap();
+		let module = self.tree.walk(false, mp.iter().cloned(), &mut ()).await.unwrap();
 		let member = (module.items.iter())
 			.filter_map(|it| if let ItemKind::Member(m) = &it.kind { Some(m) } else { None })
 			.find(|m| m.name() == cn);

orchid-host/src/system.rs

@@ -26,8 +26,8 @@ use crate::api;
 use crate::ctx::Ctx;
 use crate::expr::{Expr, ExprParseCtx};
 use crate::extension::{Extension, WeakExtension};
-use crate::parsed::{ItemKind, ParsTokTree, ParsedFromApiCx, ParsedMember, ParsedModule, Root};
-use crate::tree::{Member, Module};
+use crate::parsed::{ItemKind, ParsTokTree, ParsedModule, Root};
+use crate::tree::Module;
 
 #[derive(destructure)]
 struct SystemInstData {
@@ -70,10 +70,11 @@ impl System {
 	pub async fn lex<F: Future<Output = Option<api::SubLexed>>>(
 		&self,
 		source: Tok<String>,
+		src: Sym,
 		pos: u32,
 		r: impl FnMut(u32) -> F,
 	) -> api::OrcResult<Option<api::LexedExpr>> {
-		self.0.ext.lex_req(source, pos, self.id(), r).await
+		self.0.ext.lex_req(source, src, pos, self.id(), r).await
 	}
 	pub fn can_parse(&self, ltyp: Tok<String>) -> bool { self.0.line_types.contains(&ltyp) }
 	pub fn line_types(&self) -> impl Iterator<Item = &Tok<String>> + '_ { self.0.line_types.iter() }
@@ -84,17 +85,26 @@ impl System {
 		exported: bool,
 		comments: Vec<Comment>,
 	) -> OrcRes<Vec<ParsTokTree>> {
+		let src_path = line.first().expect("cannot be empty").sr.path();
 		let line = join_all(line.into_iter().map(|t| async {
 			let mut expr_store = self.0.ext.exprs().clone();
 			t.into_api(&mut expr_store, &mut ()).await
 		}))
 		.await;
 		let comments = comments.iter().map(Comment::to_api).collect_vec();
-		let req = api::ParseLine { module: module.to_api(), exported, sys: self.id(), comments, line };
+		let req = api::ParseLine {
+			module: module.to_api(),
+			src: src_path.to_api(),
+			exported,
+			sys: self.id(),
+			comments,
+			line,
+		};
 		match self.reqnot().request(req).await {
 			Ok(parsed) => {
 				let mut pctx = ExprParseCtx { ctx: self.ctx().clone(), exprs: self.ext().exprs().clone() };
-				Ok(ttv_from_api(parsed, &mut self.ext().exprs().clone(), &mut pctx, self.i()).await)
+				let mut ext_exprs = self.ext().exprs().clone();
+				Ok(ttv_from_api(parsed, &mut ext_exprs, &mut pctx, &src_path, self.i()).await)
 			},
 			Err(e) => Err(OrcErrv::from_api(&e, &self.ctx().i).await),
 		}
@@ -153,7 +163,8 @@ impl SystemCtor {
 				.await,
 			id,
 		}));
-		let const_root = Module::from_api((sys_inst.const_root.into_iter()).map(|k, v| api::Member {
+		let const_root =
+			Module::from_api((sys_inst.const_root.into_iter()).map(|(k, v)| api::Member {
 				name: k,
 				kind: v,
 				comments: vec![],

orchid-host/src/tree.rs

@@ -2,52 +2,87 @@ use std::cell::RefCell;
 use std::rc::{Rc, Weak};
 
 use async_once_cell::OnceCell;
-use async_stream::stream;
-use futures::StreamExt;
+use futures::FutureExt;
 use hashbrown::HashMap;
+use itertools::Itertools;
+use orchid_base::error::{OrcRes, Reporter};
 use orchid_base::interner::Tok;
-use orchid_base::name::Sym;
+use orchid_base::name::{Sym, VPath};
 
 use crate::api;
 use crate::ctx::Ctx;
-use crate::dealias::absolute_path;
-use crate::expr::Expr;
-use crate::parsed::{ParsedMemberKind, ParsedModule};
+use crate::dealias::{DealiasCtx, absolute_path, resolv_glob};
+use crate::expr::{Expr, ExprParseCtx, PathSetBuilder};
+use crate::parsed::{ParsedMemberKind, ParsedModule, Tree, WalkError, WalkErrorKind};
 use crate::system::System;
 
 pub struct Tree(Rc<RefCell<Module>>);
 
 pub struct WeakTree(Weak<RefCell<Module>>);
 
+pub struct TreeFromApiCtx<'a> {
+	pub sys: &'a System,
+	pub consts: &'a mut HashMap<Sym, Expr>,
+	pub path: Tok<Vec<Tok<String>>>,
+}
+impl<'a> TreeFromApiCtx<'a> {
+	pub async fn push<'c>(&'c mut self, name: Tok<String>) -> TreeFromApiCtx<'c> {
+		let path = self.sys.ctx().i.i(&self.path.iter().cloned().chain([name]).collect_vec()).await;
+		TreeFromApiCtx { path, consts: &mut *self.consts, sys: self.sys }
+	}
+}
+
 pub struct Module {
 	pub members: HashMap<Tok<String>, Rc<Member>>,
 }
 impl Module {
-	pub async fn from_api(
-		api: api::Module,
-		consts: &mut HashMap<Sym, Expr>,
-		sys: System,
-		path: &mut Vec<Tok<String>>
-	) -> Self {
+	pub async fn from_api(api: api::Module, ctx: &mut TreeFromApiCtx<'_>) -> Self {
 		let mut members = HashMap::new();
 		for mem in api.members {
+			let mem_name = ctx.sys.i().ex(mem.name).await;
+			let vname = VPath::new(ctx.path.iter().cloned()).name_with_suffix(mem_name.clone());
+			let name = vname.to_sym(ctx.sys.i()).await;
 			let (lazy, kind) = match mem.kind {
-				orchid_api::MemberKind::Lazy(id) => (Some(LazyMemberHandle{ id, sys: sys.clone(), path:  }))
-			}
-			members.insert(sys.ctx().i.ex(mem.name).await, member);
+				api::MemberKind::Lazy(id) =>
+					(Some(LazyMemberHandle { id, sys: ctx.sys.clone(), path: name.clone() }), None),
+				api::MemberKind::Const(val) => {
+					let mut expr_ctx =
+						ExprParseCtx { ctx: ctx.sys.ctx().clone(), exprs: ctx.sys.ext().exprs().clone() };
+					let expr = Expr::from_api(&val, PathSetBuilder::new(), &mut expr_ctx).await;
+					ctx.consts.insert(name.clone(), expr);
+					(None, Some(MemberKind::Const))
+				},
+				api::MemberKind::Module(m) => {
+					let m = Self::from_api(m, &mut ctx.push(mem_name.clone()).await).boxed_local().await;
+					(None, Some(MemberKind::Module(m)))
+				},
+				api::MemberKind::Import(import_path) =>
+					(None, Some(MemberKind::Alias(Sym::from_api(import_path, ctx.sys.i()).await))),
+			};
+			members.insert(
+				mem_name.clone(),
+				Rc::new(Member {
+					path: name.clone(),
+					public: mem.exported,
+					lazy: RefCell::new(lazy),
+					kind: kind.map_or_else(OnceCell::new, OnceCell::from),
+				}),
+			);
 		}
 		Self { members }
 	}
-	async fn walk(&self, mut path: impl Iterator<Item = Tok<String>>, ) -> &Self { todo!()}
+	async fn walk(&self, mut path: impl Iterator<Item = Tok<String>>) -> &Self { todo!() }
 	async fn from_parsed(
 		parsed: &ParsedModule,
 		path: Sym,
-		parsed_root_path: Sym,
-		parsed_root: &ParsedModule,
+		pars_root_path: Sym,
+		pars_root: &ParsedModule,
 		root: &Module,
 		preload: &mut HashMap<Sym, Module>,
+		ctx: &Ctx,
+		rep: &Reporter,
 	) -> Self {
-		let mut imported_names = Vec::new();
+		let mut imported_names = HashMap::new();
 		for import in parsed.get_imports() {
 			if let Some(n) = import.name.clone() {
 				imported_names.push(n);
@@ -57,22 +92,52 @@ impl Module {
 			if import.path.is_empty() {
 				panic!("Imported root")
 			}
-			if let Some(subpath) = import.path.strip_prefix(&parsed_root_path) {
-				let abs = absolute_path(&path, subpath);
-				// path is in parsed_root
+			let abs_path = match absolute_path(&path, &import.path) {
+				Ok(p) => p,
+				Err(e) => {
+					rep.report(e.err_obj(&ctx.i, import.sr.pos(), &path.to_string()).await);
+					continue;
+				},
+			};
+			let names = if let Some(subpath) = abs_path.strip_prefix(&pars_root_path[..]) {
+				let pars_path = (path.strip_prefix(&pars_root_path[..]))
+					.expect("pars path outside pars root");
+				resolv_glob(&pars_path, pars_root, &subpath, import.sr.pos(), &ctx.i, rep, &mut ()).await
 			} else {
-				// path is in root 
+				resolv_glob(&path, root, &abs_path, import.sr.pos(), &ctx.i, rep, &mut ()).await
 			}
 		}
 		todo!()
 	}
 }
+impl Tree for Module {
+	type Ctx = HashMap<Sym, Expr>;
+	async fn walk<I: IntoIterator<Item = Tok<String>>>(
+		&self,
+		public_only: bool,
+		path: I,
+		ctx: &'_ mut Self::Ctx,
+	) -> Result<&Self, crate::parsed::WalkError> {
+		let mut cur = self;
+		for (pos, step) in path.into_iter().enumerate() {
+			let Some(member) = self.members.get(&step) else {
+				return Err(WalkError{ pos, kind: WalkErrorKind::Missing })
+			};
+			if public_only && !member.public {
+				return Err(WalkError { pos, kind: WalkErrorKind::Private })
+			}
+			match &member.kind {
+				MemberKind::Module(m) => cur = m,
+				MemberKind::Alias()
+			}
+		}
+	}
+}
 
 pub struct Member {
 	pub public: bool,
-	pub root: WeakTree,
-	pub canonical_path: Sym,
-	pub lazy: RefCell<Option<(LazyMemberHandle, Rc<ParsedModule>)>>,
+	pub path: Sym,
+	pub lazy: RefCell<Option<LazyMemberHandle>>,
 	pub kind: OnceCell<MemberKind>,
 }
 impl Member {
@@ -82,10 +147,8 @@ impl Member {
 	}
 	pub async fn kind(&self, consts: &mut HashMap<Sym, Expr>) -> &MemberKind {
 		(self.kind.get_or_init(async {
-			let (handle, root) =
-				self.lazy.borrow_mut().take().expect("If kind is uninit, lazy must be Some");
-			let parsed = handle.run(consts).await;
-			MemberKind::from_parsed(&parsed, &root).await
+			let handle = self.lazy.borrow_mut().take().expect("If kind is uninit, lazy must be Some");
+			handle.run(consts).await
 		}))
 		.await
 	}
@@ -94,6 +157,8 @@ impl Member {
 pub enum MemberKind {
 	Const,
 	Module(Module),
+	/// This must be pointing at the final value, not a second alias.
+	Alias(Sym),
 }
 impl MemberKind {
 	async fn from_parsed(parsed: &ParsedMemberKind, root: &ParsedModule) -> Self {
@@ -110,33 +175,24 @@ pub struct LazyMemberHandle {
 	path: Sym,
 }
 impl LazyMemberHandle {
-	pub async fn run(self, consts: &mut HashMap<Sym, Expr>) -> ParsedMemberKind {
+	pub async fn run(self, consts: &mut HashMap<Sym, Expr>) -> MemberKind {
 		match self.sys.get_tree(self.id).await {
 			api::MemberKind::Const(c) => {
 				let mut pctx =
 					ExprParseCtx { ctx: self.sys.ctx().clone(), exprs: self.sys.ext().exprs().clone() };
 				consts.insert(self.path, Expr::from_api(&c, PathSetBuilder::new(), &mut pctx).await);
-				ParsedMemberKind::Const
+				MemberKind::Const
 			},
-			api::MemberKind::Module(m) => ParsedMemberKind::Mod(
-				ParsedModule::from_api(m, &mut ParsedFromApiCx {
-					sys: &self.sys,
-					consts,
-					path: self.path.tok(),
-				})
+			api::MemberKind::Module(m) => MemberKind::Module(
+				Module::from_api(m, &mut TreeFromApiCtx { sys: &self.sys, consts, path: self.path.tok() })
 					.await,
 			),
 			api::MemberKind::Lazy(id) => Self { id, ..self }.run(consts).boxed_local().await,
+			api::MemberKind::Import(path) => MemberKind::Alias(Sym::from_api(path, self.sys.i()).await),
 		}
 	}
-	pub async fn into_member(self, public: bool, name: Tok<String>) -> Member {
-		Member {
-			name,
-			public,
-			canonical_path: self.path.clone(),
-			kind: OnceCell::new(),
-			lazy: Mutex::new(Some(self)),
-		}
+	pub async fn into_member(self, public: bool, path: Sym) -> Member {
+		Member { public, path, kind: OnceCell::new(), lazy: RefCell::new(Some(self)) }
 	}
 }