let attrs = self.parse_outer_attributes()?;
let lo = self.token.span;
- if self.eat_keyword(kw::Let) {
- return self.parse_local_mk(lo, attrs.into()).map(Some);
- }
- if self.is_kw_followed_by_ident(kw::Mut) {
- return self.recover_stmt_local(lo, attrs.into(), "missing keyword", "let mut");
- }
- if self.is_kw_followed_by_ident(kw::Auto) {
+ let stmt = if self.eat_keyword(kw::Let) {
+ self.parse_local_mk(lo, attrs.into())?
+ } else if self.is_kw_followed_by_ident(kw::Mut) {
+ self.recover_stmt_local(lo, attrs.into(), "missing keyword", "let mut")?
+ } else if self.is_kw_followed_by_ident(kw::Auto) {
self.bump(); // `auto`
let msg = "write `let` instead of `auto` to introduce a new variable";
- return self.recover_stmt_local(lo, attrs.into(), msg, "let");
- }
- if self.is_kw_followed_by_ident(sym::var) {
+ self.recover_stmt_local(lo, attrs.into(), msg, "let")?
+ } else if self.is_kw_followed_by_ident(sym::var) {
self.bump(); // `var`
let msg = "write `let` instead of `var` to introduce a new variable";
- return self.recover_stmt_local(lo, attrs.into(), msg, "let");
- }
-
- // Starts like a simple path, being careful to avoid contextual keywords,
- // e.g., `union`, items with `crate` visibility, or `auto trait` items.
- // We aim to parse an arbitrary path `a::b` but not something that starts like a path
- // (1 token), but it fact not a path. Also, we avoid stealing syntax from `parse_item_`.
- if self.token.is_path_start() && !self.token.is_qpath_start() && !self.is_path_start_item()
+ self.recover_stmt_local(lo, attrs.into(), msg, "let")?
+ } else if self.token.is_path_start()
+ && !self.token.is_qpath_start()
+ && !self.is_path_start_item()
{
- let path = self.parse_path(PathStyle::Expr)?;
-
- if self.eat(&token::Not) {
- return self.parse_stmt_mac(lo, attrs.into(), path);
- }
-
- let expr = if self.check(&token::OpenDelim(token::Brace)) {
- self.parse_struct_expr(lo, path, AttrVec::new())?
- } else {
- let hi = self.prev_span;
- self.mk_expr(lo.to(hi), ExprKind::Path(None, path), AttrVec::new())
- };
-
- let expr = self.with_res(Restrictions::STMT_EXPR, |this| {
- let expr = this.parse_dot_or_call_expr_with(expr, lo, attrs.into())?;
- this.parse_assoc_expr_with(0, LhsExpr::AlreadyParsed(expr))
- })?;
- return Ok(Some(self.mk_stmt(lo.to(self.prev_span), StmtKind::Expr(expr))));
- }
-
- // FIXME: Bad copy of attrs
- let old_directory_ownership =
- mem::replace(&mut self.directory.ownership, DirectoryOwnership::UnownedViaBlock);
- let item = self.parse_item_(attrs.clone(), false, true)?;
- self.directory.ownership = old_directory_ownership;
-
- if let Some(item) = item {
- return Ok(Some(self.mk_stmt(lo.to(item.span), StmtKind::Item(item))));
- }
-
- // Do not attempt to parse an expression if we're done here.
- if self.token == token::Semi {
+ // We have avoided contextual keywords like `union`, items with `crate` visibility,
+ // or `auto trait` items. We aim to parse an arbitrary path `a::b` but not something
+ // that starts like a path (1 token), but it fact not a path.
+ // Also, we avoid stealing syntax from `parse_item_`.
+ self.parse_stmt_path_start(lo, attrs)?
+ } else if let Some(item) = self.parse_stmt_item(attrs.clone())? {
+ // FIXME: Bad copy of attrs
+ self.mk_stmt(lo.to(item.span), StmtKind::Item(P(item)))
+ } else if self.token == token::Semi {
+ // Do not attempt to parse an expression if we're done here.
self.error_outer_attrs(&attrs);
self.bump();
let mut last_semi = lo;
ExprKind::Tup(Vec::new()),
AttrVec::new(),
));
- return Ok(Some(self.mk_stmt(lo.to(last_semi), kind)));
- }
-
- if self.token == token::CloseDelim(token::Brace) {
+ self.mk_stmt(lo.to(last_semi), kind)
+ } else if self.token != token::CloseDelim(token::Brace) {
+ // Remainder are line-expr stmts.
+ let e = self.parse_expr_res(Restrictions::STMT_EXPR, Some(attrs.into()))?;
+ self.mk_stmt(lo.to(e.span), StmtKind::Expr(e))
+ } else {
self.error_outer_attrs(&attrs);
return Ok(None);
+ };
+ Ok(Some(stmt))
+ }
+
+ fn parse_stmt_item(&mut self, attrs: Vec<Attribute>) -> PResult<'a, Option<ast::Item>> {
+ let old = mem::replace(&mut self.directory.ownership, DirectoryOwnership::UnownedViaBlock);
+ let item = self.parse_item_common(attrs, false, true, |_| true)?;
+ self.directory.ownership = old;
+ Ok(item)
+ }
+
+ fn parse_stmt_path_start(&mut self, lo: Span, attrs: Vec<Attribute>) -> PResult<'a, Stmt> {
+ let path = self.parse_path(PathStyle::Expr)?;
+
+ if self.eat(&token::Not) {
+ return self.parse_stmt_mac(lo, attrs.into(), path);
}
- // Remainder are line-expr stmts.
- let e = self.parse_expr_res(Restrictions::STMT_EXPR, Some(attrs.into()))?;
- Ok(Some(self.mk_stmt(lo.to(e.span), StmtKind::Expr(e))))
+ let expr = if self.check(&token::OpenDelim(token::Brace)) {
+ self.parse_struct_expr(lo, path, AttrVec::new())?
+ } else {
+ let hi = self.prev_span;
+ self.mk_expr(lo.to(hi), ExprKind::Path(None, path), AttrVec::new())
+ };
+
+ let expr = self.with_res(Restrictions::STMT_EXPR, |this| {
+ let expr = this.parse_dot_or_call_expr_with(expr, lo, attrs.into())?;
+ this.parse_assoc_expr_with(0, LhsExpr::AlreadyParsed(expr))
+ })?;
+ Ok(self.mk_stmt(lo.to(self.prev_span), StmtKind::Expr(expr)))
}
/// Parses a statement macro `mac!(args)` provided a `path` representing `mac`.
/// At this point, the `!` token after the path has already been eaten.
- fn parse_stmt_mac(
- &mut self,
- lo: Span,
- attrs: AttrVec,
- path: ast::Path,
- ) -> PResult<'a, Option<Stmt>> {
+ fn parse_stmt_mac(&mut self, lo: Span, attrs: AttrVec, path: ast::Path) -> PResult<'a, Stmt> {
let args = self.parse_mac_args()?;
let delim = args.delim();
let hi = self.prev_span;
let e = self.parse_assoc_expr_with(0, LhsExpr::AlreadyParsed(e))?;
StmtKind::Expr(e)
};
- Ok(Some(self.mk_stmt(lo.to(hi), kind)))
+ Ok(self.mk_stmt(lo.to(hi), kind))
}
/// Error on outer attributes in this context.
attrs: AttrVec,
msg: &str,
sugg: &str,
- ) -> PResult<'a, Option<Stmt>> {
+ ) -> PResult<'a, Stmt> {
let stmt = self.parse_local_mk(lo, attrs)?;
self.struct_span_err(lo, "invalid variable declaration")
.span_suggestion(lo, msg, sugg.to_string(), Applicability::MachineApplicable)
.emit();
- Ok(Some(stmt))
+ Ok(stmt)
}
fn parse_local_mk(&mut self, lo: Span, attrs: AttrVec) -> PResult<'a, Stmt> {
- let local = self.parse_local(attrs.into())?;
+ let local = self.parse_local(attrs)?;
Ok(self.mk_stmt(lo.to(self.prev_span), StmtKind::Local(local)))
}
let mut eat_semi = true;
match stmt.kind {
- StmtKind::Expr(ref expr) if self.token != token::Eof => {
- // expression without semicolon
- if classify::expr_requires_semi_to_be_stmt(expr) {
- // Just check for errors and recover; do not eat semicolon yet.
- if let Err(mut e) =
- self.expect_one_of(&[], &[token::Semi, token::CloseDelim(token::Brace)])
- {
- if let TokenKind::DocComment(..) = self.token.kind {
- if let Ok(snippet) = self.span_to_snippet(self.token.span) {
- let sp = self.token.span;
- let marker = &snippet[..3];
- let (comment_marker, doc_comment_marker) = marker.split_at(2);
-
- e.span_suggestion(
- sp.with_hi(sp.lo() + BytePos(marker.len() as u32)),
- &format!(
- "add a space before `{}` to use a regular comment",
- doc_comment_marker,
- ),
- format!("{} {}", comment_marker, doc_comment_marker),
- Applicability::MaybeIncorrect,
- );
- }
+ // Expression without semicolon.
+ StmtKind::Expr(ref expr)
+ if self.token != token::Eof && classify::expr_requires_semi_to_be_stmt(expr) =>
+ {
+ // Just check for errors and recover; do not eat semicolon yet.
+ if let Err(mut e) =
+ self.expect_one_of(&[], &[token::Semi, token::CloseDelim(token::Brace)])
+ {
+ if let TokenKind::DocComment(..) = self.token.kind {
+ if let Ok(snippet) = self.span_to_snippet(self.token.span) {
+ let sp = self.token.span;
+ let marker = &snippet[..3];
+ let (comment_marker, doc_comment_marker) = marker.split_at(2);
+
+ e.span_suggestion(
+ sp.with_hi(sp.lo() + BytePos(marker.len() as u32)),
+ &format!(
+ "add a space before `{}` to use a regular comment",
+ doc_comment_marker,
+ ),
+ format!("{} {}", comment_marker, doc_comment_marker),
+ Applicability::MaybeIncorrect,
+ );
}
- e.emit();
- self.recover_stmt();
- // Don't complain about type errors in body tail after parse error (#57383).
- let sp = expr.span.to(self.prev_span);
- stmt.kind = StmtKind::Expr(self.mk_expr_err(sp));
}
+ e.emit();
+ self.recover_stmt();
+ // Don't complain about type errors in body tail after parse error (#57383).
+ let sp = expr.span.to(self.prev_span);
+ stmt.kind = StmtKind::Expr(self.mk_expr_err(sp));
}
}
StmtKind::Local(..) => {
projects / rust.git / blobdiff