use crate::maybe_whole;
use crate::DirectoryOwnership;
+use rustc_ast::ast;
+use rustc_ast::ast::{AttrStyle, AttrVec, Attribute, Mac, MacStmtStyle};
+use rustc_ast::ast::{Block, BlockCheckMode, Expr, ExprKind, Local, Stmt, StmtKind, DUMMY_NODE_ID};
+use rustc_ast::ptr::P;
+use rustc_ast::token::{self, TokenKind};
+use rustc_ast::util::classify;
use rustc_errors::{Applicability, PResult};
use rustc_span::source_map::{BytePos, Span};
use rustc_span::symbol::{kw, sym};
-use syntax::ast;
-use syntax::ast::{AttrStyle, AttrVec, Attribute, Mac, MacStmtStyle};
-use syntax::ast::{Block, BlockCheckMode, Expr, ExprKind, Local, Stmt, StmtKind, DUMMY_NODE_ID};
-use syntax::ptr::P;
-use syntax::token::{self, TokenKind};
-use syntax::util::classify;
use std::mem;
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()
{
- return self.parse_stmt_path_start(lo, attrs).map(Some);
- }
-
- if let Some(item) = self.parse_stmt_item(attrs.clone())? {
+ // 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
- return Ok(Some(self.mk_stmt(lo.to(item.span), StmtKind::Item(P(item)))));
- }
-
- // Do not attempt to parse an expression if we're done here.
- if self.token == token::Semi {
+ self.mk_stmt(lo.to(item.span), StmtKind::Item(P(item)))
+ } else if self.eat(&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;
- while self.token == token::Semi {
- last_semi = self.token.span;
- self.bump();
- }
- // We are encoding a string of semicolons as an an empty tuple that spans
- // the excess semicolons to preserve this info until the lint stage.
- let kind = StmtKind::Semi(self.mk_expr(
- lo.to(last_semi),
- 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, StmtKind::Empty)
+ } 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);
- }
-
- // 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))))
+ };
+ 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.clone(), false, true, |_| true)?;
+ let item = self.parse_item_common(attrs, false, true, |_| true)?;
self.directory.ownership = old;
Ok(item)
}
let expr = if self.check(&token::OpenDelim(token::Brace)) {
self.parse_struct_expr(lo, path, AttrVec::new())?
} else {
- let hi = self.prev_span;
+ let hi = self.prev_token.span;
self.mk_expr(lo.to(hi), ExprKind::Path(None, path), AttrVec::new())
};
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)))
+ Ok(self.mk_stmt(lo.to(self.prev_token.span), StmtKind::Expr(expr)))
}
/// Parses a statement macro `mac!(args)` provided a `path` representing `mac`.
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 hi = self.prev_token.span;
let style =
if delim == token::Brace { MacStmtStyle::Braces } else { MacStmtStyle::NoBraces };
/// Error on outer attributes in this context.
/// Also error if the previous token was a doc comment.
fn error_outer_attrs(&self, attrs: &[Attribute]) {
- if !attrs.is_empty() {
- if matches!(self.prev_token.kind, TokenKind::DocComment(..)) {
- self.span_fatal_err(self.prev_span, Error::UselessDocComment).emit();
+ if let [.., last] = attrs {
+ if last.is_doc_comment() {
+ self.span_fatal_err(last.span, Error::UselessDocComment).emit();
} else if attrs.iter().any(|a| a.style == AttrStyle::Outer) {
- self.struct_span_err(self.token.span, "expected statement after outer attribute")
- .emit();
+ self.struct_span_err(last.span, "expected statement after outer attribute").emit();
}
}
}
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())?;
- Ok(self.mk_stmt(lo.to(self.prev_span), StmtKind::Local(local)))
+ let local = self.parse_local(attrs)?;
+ Ok(self.mk_stmt(lo.to(self.prev_token.span), StmtKind::Local(local)))
}
/// Parses a local variable declaration.
fn parse_local(&mut self, attrs: AttrVec) -> PResult<'a, P<Local>> {
- let lo = self.prev_span;
+ let lo = self.prev_token.span;
let pat = self.parse_top_pat(GateOr::Yes)?;
let (err, ty) = if self.eat(&token::Colon) {
// Save the state of the parser before parsing type normally, in case there is a `:`
// instead of an `=` typo.
let parser_snapshot_before_type = self.clone();
- let colon_sp = self.prev_span;
+ let colon_sp = self.prev_token.span;
match self.parse_ty() {
Ok(ty) => (None, Some(ty)),
Err(mut err) => {
return Err(err);
}
};
- let hi = if self.token == token::Semi { self.token.span } else { self.prev_span };
+ let hi = if self.token == token::Semi { self.token.span } else { self.prev_token.span };
Ok(P(ast::Local { ty, pat, init, id: DUMMY_NODE_ID, span: lo.to(hi), attrs }))
}
}
let stmt_span = if self.eat(&token::Semi) {
// Expand the span to include the semicolon.
- stmt.span.with_hi(self.prev_span.hi())
+ stmt.span.with_hi(self.prev_token.span.hi())
} else {
stmt.span
};
continue;
};
}
- Ok(self.mk_block(stmts, s, lo.to(self.prev_span)))
+ Ok(self.mk_block(stmts, s, lo.to(self.prev_token.span)))
}
/// Parses a statement, including the trailing semicolon.
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_token.span);
+ stmt.kind = StmtKind::Expr(self.mk_expr_err(sp));
}
}
StmtKind::Local(..) => {
self.expect_semi()?;
eat_semi = false;
}
+ StmtKind::Empty => eat_semi = false,
_ => {}
}
if eat_semi && self.eat(&token::Semi) {
stmt = stmt.add_trailing_semicolon();
}
- stmt.span = stmt.span.to(self.prev_span);
+ stmt.span = stmt.span.to(self.prev_token.span);
Ok(Some(stmt))
}
projects / rust.git / blobdiff