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import front.ast;
import front.ast.ident;
import front.ast.def;
import front.ast.ann;
import driver.session;
import util.common.span;
import std.map.hashmap;
import std.list.list;
import std.list.nil;
import std.list.cons;
import std.option;
import std.option.some;
import std.option.none;
import std._str;
tag scope {
scope_crate(@ast.crate);
scope_item(@ast.item);
scope_block(ast.block);
}
type env = rec(list[scope] scopes,
session.session sess);
fn lookup_name(&env e, ast.ident i) -> option.t[def] {
// log "resolving name " + i;
fn found_def_item(@ast.item i) -> option.t[def] {
alt (i.node) {
case (ast.item_fn(_, _, ?id, _)) {
ret some[def](ast.def_fn(id));
}
case (ast.item_mod(_, _, ?id)) {
ret some[def](ast.def_mod(id));
}
case (ast.item_ty(_, _, ?id, _)) {
ret some[def](ast.def_ty(id));
}
}
}
fn found_decl_stmt(@ast.stmt s) -> option.t[def] {
alt (s.node) {
case (ast.stmt_decl(?d)) {
alt (d.node) {
case (ast.decl_local(?loc)) {
ret some[def](ast.def_local(loc.id));
}
case (ast.decl_item(?it)) {
ret found_def_item(it);
}
}
}
}
ret none[def];
}
fn check_mod(ast.ident i, ast._mod m) -> option.t[def] {
alt (m.index.find(i)) {
case (some[uint](?ix)) {
ret found_def_item(m.items.(ix));
}
}
ret none[def];
}
fn in_scope(ast.ident i, &scope s) -> option.t[def] {
alt (s) {
case (scope_crate(?c)) {
ret check_mod(i, c.node.module);
}
case (scope_item(?it)) {
alt (it.node) {
case (ast.item_fn(_, ?f, _, _)) {
for (ast.arg a in f.inputs) {
if (_str.eq(a.ident, i)) {
ret some[def](ast.def_arg(a.id));
}
}
}
case (ast.item_mod(_, ?m, _)) {
ret check_mod(i, m);
}
}
}
case (scope_block(?b)) {
alt (b.node.index.find(i)) {
case (some[uint](?ix)) {
ret found_decl_stmt(b.node.stmts.(ix));
}
}
}
}
ret none[def];
}
ret std.list.find[scope,def](e.scopes, bind in_scope(i, _));
}
fn fold_expr_name(&env e, &span sp, &ast.name n,
&option.t[def] d, ann a) -> @ast.expr {
auto d_ = lookup_name(e, n.node.ident);
alt (d_) {
case (some[def](_)) {
// log "resolved name " + n.node.ident;
}
case (none[def]) {
e.sess.err("unresolved name: " + n.node.ident);
}
}
ret @fold.respan[ast.expr_](sp, ast.expr_name(n, d_, a));
}
fn update_env_for_crate(&env e, @ast.crate c) -> env {
ret rec(scopes = cons[scope](scope_crate(c), @e.scopes) with e);
}
fn update_env_for_item(&env e, @ast.item i) -> env {
ret rec(scopes = cons[scope](scope_item(i), @e.scopes) with e);
}
fn update_env_for_block(&env e, &ast.block b) -> env {
ret rec(scopes = cons[scope](scope_block(b), @e.scopes) with e);
}
fn resolve_crate(session.session sess, @ast.crate crate) -> @ast.crate {
let fold.ast_fold[env] fld = fold.new_identity_fold[env]();
fld = @rec( fold_expr_name = bind fold_expr_name(_,_,_,_,_),
update_env_for_crate = bind update_env_for_crate(_,_),
update_env_for_item = bind update_env_for_item(_,_),
update_env_for_block = bind update_env_for_block(_,_)
with *fld );
auto e = rec(scopes = nil[scope],
sess = sess);
ret fold.fold_crate[env](e, fld, crate);
}
// Local Variables:
// mode: rust
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C ../.. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End:
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