Use suggestions for printf format
This commit is contained in:
Esteban Küber
parent
f9e37625e6
commit
4d8aa5989c
5 changed files with 102 additions and 14 deletions
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@ -948,6 +948,7 @@ pub fn expand_preparsed_format_args(ecx: &mut ExtCtxt,
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($kind:ident) => {{
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let mut show_doc_note = false;
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let mut suggestions = vec![];
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for sub in foreign::$kind::iter_subs(fmt_str) {
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let trn = match sub.translate() {
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Some(trn) => trn,
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@ -956,6 +957,7 @@ pub fn expand_preparsed_format_args(ecx: &mut ExtCtxt,
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None => continue,
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};
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let pos = sub.position();
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let sub = String::from(sub.as_str());
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if explained.contains(&sub) {
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continue;
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@ -967,7 +969,14 @@ pub fn expand_preparsed_format_args(ecx: &mut ExtCtxt,
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show_doc_note = true;
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}
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diag.help(&format!("`{}` should be written as `{}`", sub, trn));
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if let Some((start, end)) = pos {
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// account for `"` and account for raw strings `r#`
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let padding = str_style.map(|i| i + 2).unwrap_or(1);
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let sp = fmt_sp.from_inner_byte_pos(start + padding, end + padding);
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suggestions.push((sp, trn));
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} else {
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diag.help(&format!("`{}` should be written as `{}`", sub, trn));
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}
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}
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if show_doc_note {
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@ -976,6 +985,12 @@ pub fn expand_preparsed_format_args(ecx: &mut ExtCtxt,
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" formatting not supported; see the documentation for `std::fmt`",
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));
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}
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if suggestions.len() > 0 {
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diag.multipart_suggestion(
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"format specifiers in Rust are written using `{}`",
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suggestions,
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);
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}
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}};
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}
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@ -14,7 +14,7 @@ pub mod printf {
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/// Represents a single `printf`-style substitution.
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#[derive(Clone, PartialEq, Debug)]
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pub enum Substitution<'a> {
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/// A formatted output substitution.
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/// A formatted output substitution with its internal byte offset.
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Format(Format<'a>),
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/// A literal `%%` escape.
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Escape,
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@ -28,6 +28,23 @@ pub mod printf {
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}
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}
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pub fn position(&self) -> Option<(usize, usize)> {
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match *self {
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Substitution::Format(ref fmt) => Some(fmt.position),
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_ => None,
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}
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}
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pub fn set_position(&mut self, start: usize, end: usize) {
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match self {
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Substitution::Format(ref mut fmt) => {
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fmt.position = (start, end);
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}
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_ => {}
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}
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}
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/// Translate this substitution into an equivalent Rust formatting directive.
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///
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/// This ignores cases where the substitution does not have an exact equivalent, or where
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@ -57,6 +74,8 @@ pub mod printf {
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pub length: Option<&'a str>,
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/// Type of parameter being converted.
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pub type_: &'a str,
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/// Byte offset for the start and end of this formatting directive.
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pub position: (usize, usize),
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}
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impl<'a> Format<'a> {
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@ -257,19 +276,28 @@ pub mod printf {
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pub fn iter_subs(s: &str) -> Substitutions {
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Substitutions {
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s,
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pos: 0,
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}
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}
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/// Iterator over substitutions in a string.
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pub struct Substitutions<'a> {
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s: &'a str,
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pos: usize,
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}
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impl<'a> Iterator for Substitutions<'a> {
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type Item = Substitution<'a>;
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fn next(&mut self) -> Option<Self::Item> {
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let (sub, tail) = parse_next_substitution(self.s)?;
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let (mut sub, tail) = parse_next_substitution(self.s)?;
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self.s = tail;
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match sub {
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Substitution::Format(_) => if let Some((start, end)) = sub.position() {
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sub.set_position(start + self.pos, end + self.pos);
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self.pos += end;
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}
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Substitution::Escape => self.pos += 2,
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}
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Some(sub)
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}
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@ -301,7 +329,9 @@ pub mod printf {
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_ => {/* fall-through */},
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}
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Cur::new_at_start(&s[start..])
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//let _ = Cur::new_at_start_with_pos(&s[..], start);
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//Cur::new_at_start(&s[start..])
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Cur::new_at_start_with_pos(&s[..], start)
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};
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// This is meant to be a translation of the following regex:
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@ -355,6 +385,7 @@ pub mod printf {
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precision: None,
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length: None,
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type_: at.slice_between(next).unwrap(),
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position: (start.at, next.at),
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}),
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next.slice_after()
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));
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@ -541,6 +572,7 @@ pub mod printf {
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drop(next);
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end = at;
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let position = (start.at, end.at);
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let f = Format {
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span: start.slice_between(end).unwrap(),
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@ -550,6 +582,7 @@ pub mod printf {
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precision,
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length,
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type_,
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position,
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};
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Some((Substitution::Format(f), end.slice_after()))
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}
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@ -755,6 +788,12 @@ pub mod shell {
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}
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}
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pub fn position(&self) -> Option<(usize, usize)> {
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match *self {
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_ => None,
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}
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}
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pub fn translate(&self) -> Option<String> {
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match *self {
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Substitution::Ordinal(n) => Some(format!("{{{}}}", n)),
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@ -918,7 +957,7 @@ mod strcursor {
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pub struct StrCursor<'a> {
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s: &'a str,
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at: usize,
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pub at: usize,
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}
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impl<'a> StrCursor<'a> {
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@ -929,6 +968,13 @@ mod strcursor {
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}
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}
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pub fn new_at_start_with_pos(s: &'a str, at: usize) -> StrCursor<'a> {
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StrCursor {
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s,
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at,
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}
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}
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pub fn at_next_cp(mut self) -> Option<StrCursor<'a>> {
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match self.try_seek_right_cp() {
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true => Some(self),
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@ -178,9 +178,10 @@ error: argument never used
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--> $DIR/ifmt-bad-arg.rs:66:27
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LL | format!("foo %s baz", "bar"); //~ ERROR: argument never used
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| ^^^^^
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| -- ^^^^^
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| |
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| help: format specifiers in Rust are written using `{}`: `{}`
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= help: `%s` should be written as `{}`
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= note: printf formatting not supported; see the documentation for `std::fmt`
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error: there is no argument named `foo`
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@ -11,6 +11,11 @@
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fn main() {
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println!("%.*3$s %s!\n", "Hello,", "World", 4); //~ ERROR multiple unused formatting arguments
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println!("%1$*2$.*3$f", 123.456); //~ ERROR never used
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println!(r###"%.*3$s
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%s!\n
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"###, "Hello,", "World", 4);
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//~^ ERROR multiple unused formatting arguments
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// correctly account for raw strings in inline suggestions
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// This should *not* produce hints, on the basis that there's equally as
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// many "correct" format specifiers. It's *probably* just an actual typo.
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@ -6,27 +6,48 @@ LL | println!("%.*3$s %s!/n", "Hello,", "World", 4); //~ ERROR multiple unus
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| multiple missing formatting specifiers
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= help: `%.*3$s` should be written as `{:.2$}`
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= help: `%s` should be written as `{}`
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= note: printf formatting not supported; see the documentation for `std::fmt`
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help: format specifiers in Rust are written using `{}`
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LL | println!("{:.2$} {}!/n", "Hello,", "World", 4); //~ ERROR multiple unused formatting arguments
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| ^^^^^^ ^^
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error: argument never used
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--> $DIR/format-foreign.rs:13:29
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LL | println!("%1$*2$.*3$f", 123.456); //~ ERROR never used
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| ^^^^^^^
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| ----------- ^^^^^^^
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| |
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| help: format specifiers in Rust are written using `{}`: `{0:1$.2$}`
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= help: `%1$*2$.*3$f` should be written as `{0:1$.2$}`
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= note: printf formatting not supported; see the documentation for `std::fmt`
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error: multiple unused formatting arguments
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--> $DIR/format-foreign.rs:16:7
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LL | println!(r###"%.*3$s
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| ______________-
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LL | | %s!/n
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LL | | "###, "Hello,", "World", 4);
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| | - ^^^^^^^^ ^^^^^^^ ^
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| |____|
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| multiple missing formatting specifiers
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= note: printf formatting not supported; see the documentation for `std::fmt`
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help: format specifiers in Rust are written using `{}`
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LL | println!(r###"{:.2$}
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LL | {}!/n
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error: argument never used
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--> $DIR/format-foreign.rs:17:30
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--> $DIR/format-foreign.rs:22:30
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LL | println!("{} %f", "one", 2.0); //~ ERROR never used
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| ^^^
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error: named argument never used
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--> $DIR/format-foreign.rs:19:39
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--> $DIR/format-foreign.rs:24:39
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LL | println!("Hi there, $NAME.", NAME="Tim"); //~ ERROR never used
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| ^^^^^
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@ -34,5 +55,5 @@ LL | println!("Hi there, $NAME.", NAME="Tim"); //~ ERROR never used
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= help: `$NAME` should be written as `{NAME}`
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= note: shell formatting not supported; see the documentation for `std::fmt`
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error: aborting due to 4 previous errors
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error: aborting due to 5 previous errors
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