mirror of
https://github.com/rust-lang/rust.git
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Slightly cleanup HasFormatSpecifier::lex_format_specifier
This commit is contained in:
Lukas Wirth
parent
a3393c9a57
commit
c3148cb396
@ -288,287 +288,220 @@ pub trait HasFormatSpecifier: AstToken {
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Some(char_ranges) => char_ranges,
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None => return,
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};
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let mut chars = char_ranges.iter().peekable();
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let mut chars = char_ranges
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.iter()
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.filter_map(|(range, res)| Some((*range, *res.as_ref().ok()?)))
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.peekable();
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while let Some((range, first_char)) = chars.next() {
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match first_char {
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Ok('{') => {
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// Format specifier, see syntax at https://doc.rust-lang.org/std/fmt/index.html#syntax
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if let Some((_, Ok('{'))) = chars.peek() {
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// Escaped format specifier, `{{`
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chars.next();
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continue;
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if let '{' = first_char {
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// Format specifier, see syntax at https://doc.rust-lang.org/std/fmt/index.html#syntax
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if let Some((_, '{')) = chars.peek() {
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// Escaped format specifier, `{{`
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chars.next();
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continue;
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}
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callback(range, FormatSpecifier::Open);
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// check for integer/identifier
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let (_, int_char) = chars.peek().copied().unwrap_or_default();
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match int_char {
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// integer
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'0'..='9' => read_integer(&mut chars, &mut callback),
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// identifier
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c if c == '_' || c.is_alphabetic() => {
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read_identifier(&mut chars, &mut callback)
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}
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_ => {}
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}
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callback(*range, FormatSpecifier::Open);
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if let Some((_, ':')) = chars.peek() {
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skip_char_and_emit(&mut chars, FormatSpecifier::Colon, &mut callback);
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// check for integer/identifier
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match chars
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.peek()
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.and_then(|next| next.1.as_ref().ok())
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.copied()
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.unwrap_or_default()
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{
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'0'..='9' => {
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// integer
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read_integer(&mut chars, &mut callback);
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// check for fill/align
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let mut cloned = chars.clone().take(2);
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let (_, first) = cloned.next().unwrap_or_default();
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let (_, second) = cloned.next().unwrap_or_default();
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match second {
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'<' | '^' | '>' => {
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// alignment specifier, first char specifies fillment
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skip_char_and_emit(&mut chars, FormatSpecifier::Fill, &mut callback);
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skip_char_and_emit(&mut chars, FormatSpecifier::Align, &mut callback);
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}
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c if c == '_' || c.is_alphabetic() => {
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// identifier
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read_identifier(&mut chars, &mut callback);
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}
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_ => {}
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}
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if let Some((_, Ok(':'))) = chars.peek() {
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skip_char_and_emit(&mut chars, FormatSpecifier::Colon, &mut callback);
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// check for fill/align
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let mut cloned = chars.clone().take(2);
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let first = cloned
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.next()
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.and_then(|next| next.1.as_ref().ok())
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.copied()
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.unwrap_or_default();
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let second = cloned
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.next()
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.and_then(|next| next.1.as_ref().ok())
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.copied()
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.unwrap_or_default();
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match second {
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'<' | '^' | '>' => {
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// alignment specifier, first char specifies fillment
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::Fill,
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&mut callback,
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);
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_ => {
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if let '<' | '^' | '>' = first {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::Align,
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&mut callback,
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);
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}
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_ => match first {
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'<' | '^' | '>' => {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::Align,
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&mut callback,
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);
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}
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_ => {}
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},
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}
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}
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// check for sign
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match chars
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.peek()
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.and_then(|next| next.1.as_ref().ok())
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.copied()
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.unwrap_or_default()
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{
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'+' | '-' => {
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// check for sign
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match chars.peek().copied().unwrap_or_default().1 {
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'+' | '-' => {
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skip_char_and_emit(&mut chars, FormatSpecifier::Sign, &mut callback);
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}
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_ => {}
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}
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// check for `#`
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if let Some((_, '#')) = chars.peek() {
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skip_char_and_emit(&mut chars, FormatSpecifier::NumberSign, &mut callback);
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}
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// check for `0`
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let mut cloned = chars.clone().take(2);
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let first = cloned.next().map(|next| next.1);
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let second = cloned.next().map(|next| next.1);
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if first == Some('0') && second != Some('$') {
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skip_char_and_emit(&mut chars, FormatSpecifier::Zero, &mut callback);
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}
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// width
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match chars.peek().copied().unwrap_or_default().1 {
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'0'..='9' => {
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read_integer(&mut chars, &mut callback);
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if let Some((_, '$')) = chars.peek() {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::Sign,
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FormatSpecifier::DollarSign,
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&mut callback,
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);
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}
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_ => {}
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}
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c if c == '_' || c.is_alphabetic() => {
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read_identifier(&mut chars, &mut callback);
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// check for `#`
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if let Some((_, Ok('#'))) = chars.peek() {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::NumberSign,
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&mut callback,
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);
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}
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// check for `0`
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let mut cloned = chars.clone().take(2);
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let first = cloned.next().and_then(|next| next.1.as_ref().ok()).copied();
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let second = cloned.next().and_then(|next| next.1.as_ref().ok()).copied();
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if first == Some('0') && second != Some('$') {
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skip_char_and_emit(&mut chars, FormatSpecifier::Zero, &mut callback);
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}
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// width
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match chars
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.peek()
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.and_then(|next| next.1.as_ref().ok())
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.copied()
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.unwrap_or_default()
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{
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'0'..='9' => {
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read_integer(&mut chars, &mut callback);
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if let Some((_, Ok('$'))) = chars.peek() {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::DollarSign,
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&mut callback,
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);
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}
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}
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c if c == '_' || c.is_alphabetic() => {
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read_identifier(&mut chars, &mut callback);
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if chars.peek().and_then(|next| next.1.as_ref().ok()).copied()
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== Some('?')
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{
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::QuestionMark,
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&mut callback,
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);
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}
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// can be either width (indicated by dollar sign, or type in which case
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// the next sign has to be `}`)
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let next =
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chars.peek().and_then(|next| next.1.as_ref().ok()).copied();
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match next {
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Some('$') => skip_char_and_emit(
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&mut chars,
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FormatSpecifier::DollarSign,
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&mut callback,
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),
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Some('}') => {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::Close,
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&mut callback,
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);
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continue;
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}
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_ => continue,
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};
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}
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_ => {}
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}
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// precision
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if let Some((_, Ok('.'))) = chars.peek() {
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skip_char_and_emit(&mut chars, FormatSpecifier::Dot, &mut callback);
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match chars
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.peek()
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.and_then(|next| next.1.as_ref().ok())
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.copied()
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.unwrap_or_default()
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{
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'*' => {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::Asterisk,
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&mut callback,
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);
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}
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'0'..='9' => {
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read_integer(&mut chars, &mut callback);
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if let Some((_, Ok('$'))) = chars.peek() {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::DollarSign,
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&mut callback,
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);
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}
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}
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c if c == '_' || c.is_alphabetic() => {
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read_identifier(&mut chars, &mut callback);
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if chars.peek().and_then(|next| next.1.as_ref().ok()).copied()
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!= Some('$')
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{
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continue;
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}
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::DollarSign,
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&mut callback,
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);
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}
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_ => {
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continue;
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}
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}
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}
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// type
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match chars
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.peek()
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.and_then(|next| next.1.as_ref().ok())
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.copied()
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.unwrap_or_default()
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{
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'?' => {
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if chars.peek().map(|&(_, c)| c) == Some('?') {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::QuestionMark,
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&mut callback,
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);
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}
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c if c == '_' || c.is_alphabetic() => {
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read_identifier(&mut chars, &mut callback);
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if chars.peek().and_then(|next| next.1.as_ref().ok()).copied()
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== Some('?')
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{
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// can be either width (indicated by dollar sign, or type in which case
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// the next sign has to be `}`)
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let next = chars.peek().map(|&(_, c)| c);
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match next {
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Some('$') => skip_char_and_emit(
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&mut chars,
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FormatSpecifier::DollarSign,
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&mut callback,
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),
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Some('}') => {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::QuestionMark,
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FormatSpecifier::Close,
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&mut callback,
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);
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continue;
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}
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_ => continue,
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};
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}
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_ => {}
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}
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// precision
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if let Some((_, '.')) = chars.peek() {
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skip_char_and_emit(&mut chars, FormatSpecifier::Dot, &mut callback);
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match chars.peek().copied().unwrap_or_default().1 {
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'*' => {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::Asterisk,
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&mut callback,
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);
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}
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'0'..='9' => {
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read_integer(&mut chars, &mut callback);
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if let Some((_, '$')) = chars.peek() {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::DollarSign,
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&mut callback,
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);
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}
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}
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_ => {}
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c if c == '_' || c.is_alphabetic() => {
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read_identifier(&mut chars, &mut callback);
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if chars.peek().map(|&(_, c)| c) != Some('$') {
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continue;
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}
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::DollarSign,
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&mut callback,
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);
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}
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_ => {
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continue;
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}
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}
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}
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match chars.peek() {
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Some((_, Ok('}'))) => {
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skip_char_and_emit(&mut chars, FormatSpecifier::Close, &mut callback);
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// type
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match chars.peek().copied().unwrap_or_default().1 {
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'?' => {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::QuestionMark,
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&mut callback,
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);
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}
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Some((_, _)) | None => continue,
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c if c == '_' || c.is_alphabetic() => {
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read_identifier(&mut chars, &mut callback);
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if chars.peek().map(|&(_, c)| c) == Some('?') {
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skip_char_and_emit(
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&mut chars,
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FormatSpecifier::QuestionMark,
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&mut callback,
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);
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}
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}
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_ => {}
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}
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}
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_ => {
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while let Some((_, Ok(next_char))) = chars.peek() {
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if next_char == &'{' {
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break;
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}
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chars.next();
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}
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if let Some((_, '}')) = chars.peek() {
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skip_char_and_emit(&mut chars, FormatSpecifier::Close, &mut callback);
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}
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};
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continue;
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}
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}
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fn skip_char_and_emit<'a, I, F>(
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fn skip_char_and_emit<I, F>(
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chars: &mut std::iter::Peekable<I>,
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emit: FormatSpecifier,
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callback: &mut F,
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) where
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I: Iterator<Item = &'a (TextRange, Result<char, rustc_lexer::unescape::EscapeError>)>,
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I: Iterator<Item = (TextRange, char)>,
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F: FnMut(TextRange, FormatSpecifier),
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{
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let (range, _) = chars.next().unwrap();
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callback(*range, emit);
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callback(range, emit);
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}
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fn read_integer<'a, I, F>(chars: &mut std::iter::Peekable<I>, callback: &mut F)
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fn read_integer<I, F>(chars: &mut std::iter::Peekable<I>, callback: &mut F)
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where
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I: Iterator<Item = &'a (TextRange, Result<char, rustc_lexer::unescape::EscapeError>)>,
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I: Iterator<Item = (TextRange, char)>,
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F: FnMut(TextRange, FormatSpecifier),
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{
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let (mut range, c) = chars.next().unwrap();
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assert!(c.as_ref().unwrap().is_ascii_digit());
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while let Some((r, Ok(next_char))) = chars.peek() {
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assert!(c.is_ascii_digit());
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while let Some(&(r, next_char)) = chars.peek() {
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if next_char.is_ascii_digit() {
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chars.next();
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range = range.cover(*r);
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range = range.cover(r);
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} else {
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break;
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}
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@ -576,17 +509,17 @@ pub trait HasFormatSpecifier: AstToken {
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callback(range, FormatSpecifier::Integer);
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}
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fn read_identifier<'a, I, F>(chars: &mut std::iter::Peekable<I>, callback: &mut F)
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fn read_identifier<I, F>(chars: &mut std::iter::Peekable<I>, callback: &mut F)
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where
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I: Iterator<Item = &'a (TextRange, Result<char, rustc_lexer::unescape::EscapeError>)>,
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I: Iterator<Item = (TextRange, char)>,
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F: FnMut(TextRange, FormatSpecifier),
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{
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let (mut range, c) = chars.next().unwrap();
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assert!(c.as_ref().unwrap().is_alphabetic() || *c.as_ref().unwrap() == '_');
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while let Some((r, Ok(next_char))) = chars.peek() {
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if *next_char == '_' || next_char.is_ascii_digit() || next_char.is_alphabetic() {
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assert!(c.is_alphabetic() || c == '_');
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while let Some(&(r, next_char)) = chars.peek() {
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if next_char == '_' || next_char.is_ascii_digit() || next_char.is_alphabetic() {
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chars.next();
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range = range.cover(*r);
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range = range.cover(r);
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} else {
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break;
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}
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