refactor: backport syntux mod

1 files changed, 8 insertions, 59 deletions

diff --git a/src/modules/visitor.rs b/src/modules/visitor.rs
index a2055b6f4ea..ad9111f7a9f 100644
--- a/src/modules/visitor.rs
+++ b/src/modules/visitor.rs
@@ -1,11 +1,10 @@
-use rustc_parse::{stream_to_parser_with_base_dir, Directory};
-use rustc_session::parse::ParseSess;
-use rustc_span::{symbol::kw, Symbol};
+use rustc_span::Symbol;
 use syntax::ast;
-use syntax::token::{DelimToken, TokenKind};
 use syntax::visit::Visitor;
 
 use crate::attr::MetaVisitor;
+use crate::syntux::parser::{Directory, Parser};
+use crate::syntux::session::ParseSess;
 
 pub(crate) struct ModItem {
     pub(crate) item: ast::Item,
@@ -15,11 +14,11 @@ pub(crate) struct ModItem {
 pub(crate) struct CfgIfVisitor<'a> {
     parse_sess: &'a ParseSess,
     mods: Vec<ModItem>,
-    base_dir: Directory,
+    base_dir: &'a Directory,
 }
 
 impl<'a> CfgIfVisitor<'a> {
-    pub(crate) fn new(parse_sess: &'a ParseSess, base_dir: Directory) -> CfgIfVisitor<'a> {
+    pub(crate) fn new(parse_sess: &'a ParseSess, base_dir: &'a Directory) -> CfgIfVisitor<'a> {
         CfgIfVisitor {
             mods: vec![],
             parse_sess,
@@ -65,59 +64,9 @@ impl<'a, 'ast: 'a> CfgIfVisitor<'a> {
             }
         };
 
-        let ts = mac.args.inner_tokens();
-        let mut parser =
-            stream_to_parser_with_base_dir(self.parse_sess, ts.clone(), self.base_dir.clone());
-        parser.cfg_mods = false;
-        let mut process_if_cfg = true;
-
-        while parser.token.kind != TokenKind::Eof {
-            if process_if_cfg {
-                if !parser.eat_keyword(kw::If) {
-                    return Err("Expected `if`");
-                }
-                parser
-                    .parse_attribute(false)
-                    .map_err(|_| "Failed to parse attributes")?;
-            }
-
-            if !parser.eat(&TokenKind::OpenDelim(DelimToken::Brace)) {
-                return Err("Expected an opening brace");
-            }
-
-            while parser.token != TokenKind::CloseDelim(DelimToken::Brace)
-                && parser.token.kind != TokenKind::Eof
-            {
-                let item = match parser.parse_item() {
-                    Ok(Some(item_ptr)) => item_ptr.into_inner(),
-                    Ok(None) => continue,
-                    Err(mut err) => {
-                        err.cancel();
-                        parser.sess.span_diagnostic.reset_err_count();
-                        return Err(
-                            "Expected item inside cfg_if block, but failed to parse it as an item",
-                        );
-                    }
-                };
-                if let ast::ItemKind::Mod(..) = item.kind {
-                    self.mods.push(ModItem { item });
-                }
-            }
-
-            if !parser.eat(&TokenKind::CloseDelim(DelimToken::Brace)) {
-                return Err("Expected a closing brace");
-            }
-
-            if parser.eat(&TokenKind::Eof) {
-                break;
-            }
-
-            if !parser.eat_keyword(kw::Else) {
-                return Err("Expected `else`");
-            }
-
-            process_if_cfg = parser.token.is_keyword(kw::If);
-        }
+        let items = Parser::parse_cfg_if(self.parse_sess, mac, &self.base_dir)?;
+        self.mods
+            .append(&mut items.into_iter().map(|item| ModItem { item }).collect());
 
         Ok(())
     }