simplify parse_bottom_expr more
This commit is contained in:
Mazdak Farrokhzad
parent
948ff674f9
commit
3d5dbcb44a
1 changed files with 76 additions and 78 deletions
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@ -824,90 +824,88 @@ impl<'a> Parser<'a> {
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// Note: when adding new syntax here, don't forget to adjust `TokenKind::can_begin_expr()`.
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let lo = self.token.span;
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match self.token.kind {
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if let token::Literal(_) = self.token.kind {
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// This match arm is a special-case of the `_` match arm below and
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// could be removed without changing functionality, but it's faster
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// to have it here, especially for programs with large constants.
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token::Literal(_) => self.parse_lit_expr(attrs),
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token::OpenDelim(token::Paren) => self.parse_tuple_parens_expr(attrs),
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token::OpenDelim(token::Brace) => {
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self.parse_block_expr(None, lo, BlockCheckMode::Default, attrs)
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}
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token::BinOp(token::Or) | token::OrOr => self.parse_closure_expr(attrs),
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token::OpenDelim(token::Bracket) => self.parse_array_or_repeat_expr(attrs),
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_ => {
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if self.eat_lt() {
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let (qself, path) = self.parse_qpath(PathStyle::Expr)?;
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Ok(self.mk_expr(lo.to(path.span), ExprKind::Path(Some(qself), path), attrs))
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} else if self.token.is_path_start() {
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self.parse_path_start_expr(attrs)
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} else if self.check_keyword(kw::Move) || self.check_keyword(kw::Static) {
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self.parse_closure_expr(attrs)
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} else if self.eat_keyword(kw::If) {
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self.parse_if_expr(attrs)
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} else if self.eat_keyword(kw::For) {
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self.parse_for_expr(None, self.prev_span, attrs)
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} else if self.eat_keyword(kw::While) {
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self.parse_while_expr(None, self.prev_span, attrs)
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} else if let Some(label) = self.eat_label() {
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self.parse_labeled_expr(label, attrs)
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} else if self.eat_keyword(kw::Loop) {
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self.parse_loop_expr(None, self.prev_span, attrs)
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} else if self.eat_keyword(kw::Continue) {
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let kind = ExprKind::Continue(self.eat_label());
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Ok(self.mk_expr(lo.to(self.prev_span), kind, attrs))
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} else if self.eat_keyword(kw::Match) {
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let match_sp = self.prev_span;
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self.parse_match_expr(attrs).map_err(|mut err| {
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err.span_label(match_sp, "while parsing this match expression");
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err
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})
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} else if self.eat_keyword(kw::Unsafe) {
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let mode = BlockCheckMode::Unsafe(ast::UserProvided);
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self.parse_block_expr(None, lo, mode, attrs)
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} else if self.is_do_catch_block() {
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self.recover_do_catch(attrs)
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} else if self.is_try_block() {
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self.expect_keyword(kw::Try)?;
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self.parse_try_block(lo, attrs)
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} else if self.eat_keyword(kw::Return) {
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self.parse_return_expr(attrs)
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} else if self.eat_keyword(kw::Break) {
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self.parse_break_expr(attrs)
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} else if self.eat_keyword(kw::Yield) {
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self.parse_yield_expr(attrs)
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} else if self.eat_keyword(kw::Let) {
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self.parse_let_expr(attrs)
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} else if !self.unclosed_delims.is_empty() && self.check(&token::Semi) {
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// Don't complain about bare semicolons after unclosed braces
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// recovery in order to keep the error count down. Fixing the
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// delimiters will possibly also fix the bare semicolon found in
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// expression context. For example, silence the following error:
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//
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// error: expected expression, found `;`
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// --> file.rs:2:13
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// |
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// 2 | foo(bar(;
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// | ^ expected expression
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self.bump();
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Ok(self.mk_expr_err(self.token.span))
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} else if self.token.span.rust_2018() {
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// `Span::rust_2018()` is somewhat expensive; don't get it repeatedly.
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if self.check_keyword(kw::Async) {
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if self.is_async_block() { // Check for `async {` and `async move {`.
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self.parse_async_block(attrs)
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} else {
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self.parse_closure_expr(attrs)
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}
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} else if self.eat_keyword(kw::Await) {
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self.recover_incorrect_await_syntax(lo, self.prev_span, attrs)
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} else {
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self.parse_lit_expr(attrs)
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}
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self.parse_lit_expr(attrs)
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} else if self.check(&token::OpenDelim(token::Paren)) {
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self.parse_tuple_parens_expr(attrs)
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} else if self.check(&token::OpenDelim(token::Brace)) {
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self.parse_block_expr(None, lo, BlockCheckMode::Default, attrs)
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} else if self.check(&token::BinOp(token::Or)) || self.check(&token::OrOr) {
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self.parse_closure_expr(attrs)
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} else if self.check(&token::OpenDelim(token::Bracket)) {
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self.parse_array_or_repeat_expr(attrs)
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} else if self.eat_lt() {
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let (qself, path) = self.parse_qpath(PathStyle::Expr)?;
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Ok(self.mk_expr(lo.to(path.span), ExprKind::Path(Some(qself), path), attrs))
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} else if self.token.is_path_start() {
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self.parse_path_start_expr(attrs)
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} else if self.check_keyword(kw::Move) || self.check_keyword(kw::Static) {
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self.parse_closure_expr(attrs)
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} else if self.eat_keyword(kw::If) {
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self.parse_if_expr(attrs)
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} else if self.eat_keyword(kw::For) {
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self.parse_for_expr(None, self.prev_span, attrs)
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} else if self.eat_keyword(kw::While) {
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self.parse_while_expr(None, self.prev_span, attrs)
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} else if let Some(label) = self.eat_label() {
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self.parse_labeled_expr(label, attrs)
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} else if self.eat_keyword(kw::Loop) {
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self.parse_loop_expr(None, self.prev_span, attrs)
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} else if self.eat_keyword(kw::Continue) {
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let kind = ExprKind::Continue(self.eat_label());
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Ok(self.mk_expr(lo.to(self.prev_span), kind, attrs))
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} else if self.eat_keyword(kw::Match) {
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let match_sp = self.prev_span;
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self.parse_match_expr(attrs).map_err(|mut err| {
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err.span_label(match_sp, "while parsing this match expression");
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err
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})
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} else if self.eat_keyword(kw::Unsafe) {
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self.parse_block_expr(None, lo, BlockCheckMode::Unsafe(ast::UserProvided), attrs)
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} else if self.is_do_catch_block() {
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self.recover_do_catch(attrs)
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} else if self.is_try_block() {
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self.expect_keyword(kw::Try)?;
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self.parse_try_block(lo, attrs)
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} else if self.eat_keyword(kw::Return) {
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self.parse_return_expr(attrs)
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} else if self.eat_keyword(kw::Break) {
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self.parse_break_expr(attrs)
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} else if self.eat_keyword(kw::Yield) {
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self.parse_yield_expr(attrs)
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} else if self.eat_keyword(kw::Let) {
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self.parse_let_expr(attrs)
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} else if !self.unclosed_delims.is_empty() && self.check(&token::Semi) {
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// Don't complain about bare semicolons after unclosed braces
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// recovery in order to keep the error count down. Fixing the
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// delimiters will possibly also fix the bare semicolon found in
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// expression context. For example, silence the following error:
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//
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// error: expected expression, found `;`
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// --> file.rs:2:13
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// |
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// 2 | foo(bar(;
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// | ^ expected expression
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self.bump();
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Ok(self.mk_expr_err(self.token.span))
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} else if self.token.span.rust_2018() {
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// `Span::rust_2018()` is somewhat expensive; don't get it repeatedly.
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if self.check_keyword(kw::Async) {
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if self.is_async_block() { // Check for `async {` and `async move {`.
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self.parse_async_block(attrs)
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} else {
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self.parse_lit_expr(attrs)
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self.parse_closure_expr(attrs)
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}
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} else if self.eat_keyword(kw::Await) {
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self.recover_incorrect_await_syntax(lo, self.prev_span, attrs)
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} else {
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self.parse_lit_expr(attrs)
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}
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} else {
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self.parse_lit_expr(attrs)
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}
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}
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