bjoernager/rust
bjoernager/rust
1
Fork 0
Code Issues Pull requests Activity

Make rustc_parse_format compile on stable

Browse source 
This allows it to be used by lightweight formatting systems and may
allow it to be used by rust-analyzer.
This commit is contained in:
bjorn3 2022-04-29 18:48:58 +02:00
parent 683c582c1e
commit d33140d2dc
9 changed files with 231 additions and 191 deletions
Download patch file Download diff file Expand all files Collapse all files

34
compiler/rustc_builtin_macros/src/format.rs
View file

@ -242,7 +242,7 @@ impl<'a, 'b> Context<'a, 'b> {
fn resolve_name_inplace(&self, p: &mut parse::Piece<'_>) {
// NOTE: the `unwrap_or` branch is needed in case of invalid format
// arguments, e.g., `format_args!("{foo}")`.
let lookup = |s: Symbol| *self.names.get(&s).unwrap_or(&0);
let lookup = |s: &str| *self.names.get(&Symbol::intern(s)).unwrap_or(&0);
match *p {
parse::String(_) => {}
@ -276,7 +276,9 @@ impl<'a, 'b> Context<'a, 'b> {
// it's written second, so it should come after width/precision.
let pos = match arg.position {
parse::ArgumentIs(i) | parse::ArgumentImplicitlyIs(i) => Exact(i),
parse::ArgumentNamed(s, span) => Named(s, span),
parse::ArgumentNamed(s, span) => {
Named(Symbol::intern(s), InnerSpan::new(span.start, span.end))
}
};
let ty = Placeholder(match arg.format.ty {
@ -291,7 +293,10 @@ impl<'a, 'b> Context<'a, 'b> {
"X" => "UpperHex",
_ => {
let fmtsp = self.fmtsp;
let sp = arg.format.ty_span.map(|sp| fmtsp.from_inner(sp));
let sp = arg
.format
.ty_span
.map(|sp| fmtsp.from_inner(InnerSpan::new(sp.start, sp.end)));
let mut err = self.ecx.struct_span_err(
sp.unwrap_or(fmtsp),
&format!("unknown format trait `{}`", arg.format.ty),
@ -340,14 +345,17 @@ impl<'a, 'b> Context<'a, 'b> {
}
}
fn verify_count(&mut self, c: parse::Count) {
fn verify_count(&mut self, c: parse::Count<'_>) {
match c {
parse::CountImplied | parse::CountIs(..) => {}
parse::CountIsParam(i) => {
self.verify_arg_type(Exact(i), Count);
}
parse::CountIsName(s, span) => {
self.verify_arg_type(Named(s, span), Count);
self.verify_arg_type(
Named(Symbol::intern(s), InnerSpan::new(span.start, span.end)),
Count,
);
}
}
}
@ -425,7 +433,7 @@ impl<'a, 'b> Context<'a, 'b> {
for fmt in &self.arg_with_formatting {
if let Some(span) = fmt.precision_span {
let span = self.fmtsp.from_inner(span);
let span = self.fmtsp.from_inner(InnerSpan::new(span.start, span.end));
match fmt.precision {
parse::CountIsParam(pos) if pos > self.num_args() => {
e.span_label(
@ -471,7 +479,7 @@ impl<'a, 'b> Context<'a, 'b> {
}
}
if let Some(span) = fmt.width_span {
let span = self.fmtsp.from_inner(span);
let span = self.fmtsp.from_inner(InnerSpan::new(span.start, span.end));
match fmt.width {
parse::CountIsParam(pos) if pos > self.num_args() => {
e.span_label(
@ -610,7 +618,7 @@ impl<'a, 'b> Context<'a, 'b> {
ecx.std_path(&[sym::fmt, sym::rt, sym::v1, s])
}
fn build_count(&self, c: parse::Count) -> P<ast::Expr> {
fn build_count(&self, c: parse::Count<'_>) -> P<ast::Expr> {
let sp = self.macsp;
let count = |c, arg| {
let mut path = Context::rtpath(self.ecx, sym::Count);
@ -1033,7 +1041,7 @@ pub fn expand_preparsed_format_args(
if !parser.errors.is_empty() {
let err = parser.errors.remove(0);
let sp = if efmt_kind_is_lit {
fmt_span.from_inner(err.span)
fmt_span.from_inner(InnerSpan::new(err.span.start, err.span.end))
} else {
// The format string could be another macro invocation, e.g.:
// format!(concat!("abc", "{}"), 4);
@ -1052,14 +1060,18 @@ pub fn expand_preparsed_format_args(
}
if let Some((label, span)) = err.secondary_label {
if efmt_kind_is_lit {
e.span_label(fmt_span.from_inner(span), label);
e.span_label(fmt_span.from_inner(InnerSpan::new(span.start, span.end)), label);
}
}
e.emit();
return DummyResult::raw_expr(sp, true);
}
let arg_spans = parser.arg_places.iter().map(|span| fmt_span.from_inner(*span)).collect();
let arg_spans = parser
.arg_places
.iter()
.map(|span| fmt_span.from_inner(InnerSpan::new(span.start, span.end)))
.collect();
let named_pos: FxHashSet<usize> = names.values().cloned().collect();