From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- rust/proc-macro2/parse.rs | 997 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 997 insertions(+) create mode 100644 rust/proc-macro2/parse.rs (limited to 'rust/proc-macro2/parse.rs') diff --git a/rust/proc-macro2/parse.rs b/rust/proc-macro2/parse.rs new file mode 100644 index 000000000..a005dea1f --- /dev/null +++ b/rust/proc-macro2/parse.rs @@ -0,0 +1,997 @@ +// SPDX-License-Identifier: Apache-2.0 OR MIT + +use crate::fallback::{ + self, is_ident_continue, is_ident_start, Group, Ident, LexError, Literal, Span, TokenStream, + TokenStreamBuilder, +}; +use crate::{Delimiter, Punct, Spacing, TokenTree}; +use core::char; +use core::str::{Bytes, CharIndices, Chars}; + +#[derive(Copy, Clone, Eq, PartialEq)] +pub(crate) struct Cursor<'a> { + pub(crate) rest: &'a str, + #[cfg(span_locations)] + pub(crate) off: u32, +} + +impl<'a> Cursor<'a> { + pub(crate) fn advance(&self, bytes: usize) -> Cursor<'a> { + let (_front, rest) = self.rest.split_at(bytes); + Cursor { + rest, + #[cfg(span_locations)] + off: self.off + _front.chars().count() as u32, + } + } + + pub(crate) fn starts_with(&self, s: &str) -> bool { + self.rest.starts_with(s) + } + + pub(crate) fn starts_with_char(&self, ch: char) -> bool { + self.rest.starts_with(ch) + } + + pub(crate) fn starts_with_fn(&self, f: Pattern) -> bool + where + Pattern: FnMut(char) -> bool, + { + self.rest.starts_with(f) + } + + pub(crate) fn is_empty(&self) -> bool { + self.rest.is_empty() + } + + fn len(&self) -> usize { + self.rest.len() + } + + fn as_bytes(&self) -> &'a [u8] { + self.rest.as_bytes() + } + + fn bytes(&self) -> Bytes<'a> { + self.rest.bytes() + } + + fn chars(&self) -> Chars<'a> { + self.rest.chars() + } + + fn char_indices(&self) -> CharIndices<'a> { + self.rest.char_indices() + } + + fn parse(&self, tag: &str) -> Result, Reject> { + if self.starts_with(tag) { + Ok(self.advance(tag.len())) + } else { + Err(Reject) + } + } +} + +pub(crate) struct Reject; +type PResult<'a, O> = Result<(Cursor<'a>, O), Reject>; + +fn skip_whitespace(input: Cursor) -> Cursor { + let mut s = input; + + while !s.is_empty() { + let byte = s.as_bytes()[0]; + if byte == b'/' { + if s.starts_with("//") + && (!s.starts_with("///") || s.starts_with("////")) + && !s.starts_with("//!") + { + let (cursor, _) = take_until_newline_or_eof(s); + s = cursor; + continue; + } else if s.starts_with("/**/") { + s = s.advance(4); + continue; + } else if s.starts_with("/*") + && (!s.starts_with("/**") || s.starts_with("/***")) + && !s.starts_with("/*!") + { + match block_comment(s) { + Ok((rest, _)) => { + s = rest; + continue; + } + Err(Reject) => return s, + } + } + } + match byte { + b' ' | 0x09..=0x0d => { + s = s.advance(1); + continue; + } + b if b.is_ascii() => {} + _ => { + let ch = s.chars().next().unwrap(); + if is_whitespace(ch) { + s = s.advance(ch.len_utf8()); + continue; + } + } + } + return s; + } + s +} + +fn block_comment(input: Cursor) -> PResult<&str> { + if !input.starts_with("/*") { + return Err(Reject); + } + + let mut depth = 0usize; + let bytes = input.as_bytes(); + let mut i = 0usize; + let upper = bytes.len() - 1; + + while i < upper { + if bytes[i] == b'/' && bytes[i + 1] == b'*' { + depth += 1; + i += 1; // eat '*' + } else if bytes[i] == b'*' && bytes[i + 1] == b'/' { + depth -= 1; + if depth == 0 { + return Ok((input.advance(i + 2), &input.rest[..i + 2])); + } + i += 1; // eat '/' + } + i += 1; + } + + Err(Reject) +} + +fn is_whitespace(ch: char) -> bool { + // Rust treats left-to-right mark and right-to-left mark as whitespace + ch.is_whitespace() || ch == '\u{200e}' || ch == '\u{200f}' +} + +fn word_break(input: Cursor) -> Result { + match input.chars().next() { + Some(ch) if is_ident_continue(ch) => Err(Reject), + Some(_) | None => Ok(input), + } +} + +// Rustc's representation of a macro expansion error in expression position or +// type position. +const ERROR: &str = "(/*ERROR*/)"; + +pub(crate) fn token_stream(mut input: Cursor) -> Result { + let mut trees = TokenStreamBuilder::new(); + let mut stack = Vec::new(); + + loop { + input = skip_whitespace(input); + + if let Ok((rest, ())) = doc_comment(input, &mut trees) { + input = rest; + continue; + } + + #[cfg(span_locations)] + let lo = input.off; + + let first = match input.bytes().next() { + Some(first) => first, + None => match stack.last() { + None => return Ok(trees.build()), + #[cfg(span_locations)] + Some((lo, _frame)) => { + return Err(LexError { + span: Span { lo: *lo, hi: *lo }, + }) + } + #[cfg(not(span_locations))] + Some(_frame) => return Err(LexError { span: Span {} }), + }, + }; + + if let Some(open_delimiter) = match first { + b'(' if !input.starts_with(ERROR) => Some(Delimiter::Parenthesis), + b'[' => Some(Delimiter::Bracket), + b'{' => Some(Delimiter::Brace), + _ => None, + } { + input = input.advance(1); + let frame = (open_delimiter, trees); + #[cfg(span_locations)] + let frame = (lo, frame); + stack.push(frame); + trees = TokenStreamBuilder::new(); + } else if let Some(close_delimiter) = match first { + b')' => Some(Delimiter::Parenthesis), + b']' => Some(Delimiter::Bracket), + b'}' => Some(Delimiter::Brace), + _ => None, + } { + let frame = match stack.pop() { + Some(frame) => frame, + None => return Err(lex_error(input)), + }; + #[cfg(span_locations)] + let (lo, frame) = frame; + let (open_delimiter, outer) = frame; + if open_delimiter != close_delimiter { + return Err(lex_error(input)); + } + input = input.advance(1); + let mut g = Group::new(open_delimiter, trees.build()); + g.set_span(Span { + #[cfg(span_locations)] + lo, + #[cfg(span_locations)] + hi: input.off, + }); + trees = outer; + trees.push_token_from_parser(TokenTree::Group(crate::Group::_new_fallback(g))); + } else { + let (rest, mut tt) = match leaf_token(input) { + Ok((rest, tt)) => (rest, tt), + Err(Reject) => return Err(lex_error(input)), + }; + tt.set_span(crate::Span::_new_fallback(Span { + #[cfg(span_locations)] + lo, + #[cfg(span_locations)] + hi: rest.off, + })); + trees.push_token_from_parser(tt); + input = rest; + } + } +} + +fn lex_error(cursor: Cursor) -> LexError { + #[cfg(not(span_locations))] + let _ = cursor; + LexError { + span: Span { + #[cfg(span_locations)] + lo: cursor.off, + #[cfg(span_locations)] + hi: cursor.off, + }, + } +} + +fn leaf_token(input: Cursor) -> PResult { + if let Ok((input, l)) = literal(input) { + // must be parsed before ident + Ok((input, TokenTree::Literal(crate::Literal::_new_fallback(l)))) + } else if let Ok((input, p)) = punct(input) { + Ok((input, TokenTree::Punct(p))) + } else if let Ok((input, i)) = ident(input) { + Ok((input, TokenTree::Ident(i))) + } else if input.starts_with(ERROR) { + let rest = input.advance(ERROR.len()); + let repr = crate::Literal::_new_fallback(Literal::_new(ERROR.to_owned())); + Ok((rest, TokenTree::Literal(repr))) + } else { + Err(Reject) + } +} + +fn ident(input: Cursor) -> PResult { + if [ + "r\"", "r#\"", "r##", "b\"", "b\'", "br\"", "br#", "c\"", "cr\"", "cr#", + ] + .iter() + .any(|prefix| input.starts_with(prefix)) + { + Err(Reject) + } else { + ident_any(input) + } +} + +fn ident_any(input: Cursor) -> PResult { + let raw = input.starts_with("r#"); + let rest = input.advance((raw as usize) << 1); + + let (rest, sym) = ident_not_raw(rest)?; + + if !raw { + let ident = + crate::Ident::_new_fallback(Ident::new_unchecked(sym, fallback::Span::call_site())); + return Ok((rest, ident)); + } + + match sym { + "_" | "super" | "self" | "Self" | "crate" => return Err(Reject), + _ => {} + } + + let ident = + crate::Ident::_new_fallback(Ident::new_raw_unchecked(sym, fallback::Span::call_site())); + Ok((rest, ident)) +} + +fn ident_not_raw(input: Cursor) -> PResult<&str> { + let mut chars = input.char_indices(); + + match chars.next() { + Some((_, ch)) if is_ident_start(ch) => {} + _ => return Err(Reject), + } + + let mut end = input.len(); + for (i, ch) in chars { + if !is_ident_continue(ch) { + end = i; + break; + } + } + + Ok((input.advance(end), &input.rest[..end])) +} + +pub(crate) fn literal(input: Cursor) -> PResult { + let rest = literal_nocapture(input)?; + let end = input.len() - rest.len(); + Ok((rest, Literal::_new(input.rest[..end].to_string()))) +} + +fn literal_nocapture(input: Cursor) -> Result { + if let Ok(ok) = string(input) { + Ok(ok) + } else if let Ok(ok) = byte_string(input) { + Ok(ok) + } else if let Ok(ok) = c_string(input) { + Ok(ok) + } else if let Ok(ok) = byte(input) { + Ok(ok) + } else if let Ok(ok) = character(input) { + Ok(ok) + } else if let Ok(ok) = float(input) { + Ok(ok) + } else if let Ok(ok) = int(input) { + Ok(ok) + } else { + Err(Reject) + } +} + +fn literal_suffix(input: Cursor) -> Cursor { + match ident_not_raw(input) { + Ok((input, _)) => input, + Err(Reject) => input, + } +} + +fn string(input: Cursor) -> Result { + if let Ok(input) = input.parse("\"") { + cooked_string(input) + } else if let Ok(input) = input.parse("r") { + raw_string(input) + } else { + Err(Reject) + } +} + +fn cooked_string(mut input: Cursor) -> Result { + let mut chars = input.char_indices(); + + while let Some((i, ch)) = chars.next() { + match ch { + '"' => { + let input = input.advance(i + 1); + return Ok(literal_suffix(input)); + } + '\r' => match chars.next() { + Some((_, '\n')) => {} + _ => break, + }, + '\\' => match chars.next() { + Some((_, 'x')) => { + backslash_x_char(&mut chars)?; + } + Some((_, 'n' | 'r' | 't' | '\\' | '\'' | '"' | '0')) => {} + Some((_, 'u')) => { + backslash_u(&mut chars)?; + } + Some((newline, ch @ ('\n' | '\r'))) => { + input = input.advance(newline + 1); + trailing_backslash(&mut input, ch as u8)?; + chars = input.char_indices(); + } + _ => break, + }, + _ch => {} + } + } + Err(Reject) +} + +fn raw_string(input: Cursor) -> Result { + let (input, delimiter) = delimiter_of_raw_string(input)?; + let mut bytes = input.bytes().enumerate(); + while let Some((i, byte)) = bytes.next() { + match byte { + b'"' if input.rest[i + 1..].starts_with(delimiter) => { + let rest = input.advance(i + 1 + delimiter.len()); + return Ok(literal_suffix(rest)); + } + b'\r' => match bytes.next() { + Some((_, b'\n')) => {} + _ => break, + }, + _ => {} + } + } + Err(Reject) +} + +fn byte_string(input: Cursor) -> Result { + if let Ok(input) = input.parse("b\"") { + cooked_byte_string(input) + } else if let Ok(input) = input.parse("br") { + raw_byte_string(input) + } else { + Err(Reject) + } +} + +fn cooked_byte_string(mut input: Cursor) -> Result { + let mut bytes = input.bytes().enumerate(); + while let Some((offset, b)) = bytes.next() { + match b { + b'"' => { + let input = input.advance(offset + 1); + return Ok(literal_suffix(input)); + } + b'\r' => match bytes.next() { + Some((_, b'\n')) => {} + _ => break, + }, + b'\\' => match bytes.next() { + Some((_, b'x')) => { + backslash_x_byte(&mut bytes)?; + } + Some((_, b'n' | b'r' | b't' | b'\\' | b'0' | b'\'' | b'"')) => {} + Some((newline, b @ (b'\n' | b'\r'))) => { + input = input.advance(newline + 1); + trailing_backslash(&mut input, b)?; + bytes = input.bytes().enumerate(); + } + _ => break, + }, + b if b.is_ascii() => {} + _ => break, + } + } + Err(Reject) +} + +fn delimiter_of_raw_string(input: Cursor) -> PResult<&str> { + for (i, byte) in input.bytes().enumerate() { + match byte { + b'"' => { + if i > 255 { + // https://github.com/rust-lang/rust/pull/95251 + return Err(Reject); + } + return Ok((input.advance(i + 1), &input.rest[..i])); + } + b'#' => {} + _ => break, + } + } + Err(Reject) +} + +fn raw_byte_string(input: Cursor) -> Result { + let (input, delimiter) = delimiter_of_raw_string(input)?; + let mut bytes = input.bytes().enumerate(); + while let Some((i, byte)) = bytes.next() { + match byte { + b'"' if input.rest[i + 1..].starts_with(delimiter) => { + let rest = input.advance(i + 1 + delimiter.len()); + return Ok(literal_suffix(rest)); + } + b'\r' => match bytes.next() { + Some((_, b'\n')) => {} + _ => break, + }, + other => { + if !other.is_ascii() { + break; + } + } + } + } + Err(Reject) +} + +fn c_string(input: Cursor) -> Result { + if let Ok(input) = input.parse("c\"") { + cooked_c_string(input) + } else if let Ok(input) = input.parse("cr") { + raw_c_string(input) + } else { + Err(Reject) + } +} + +fn raw_c_string(input: Cursor) -> Result { + let (input, delimiter) = delimiter_of_raw_string(input)?; + let mut bytes = input.bytes().enumerate(); + while let Some((i, byte)) = bytes.next() { + match byte { + b'"' if input.rest[i + 1..].starts_with(delimiter) => { + let rest = input.advance(i + 1 + delimiter.len()); + return Ok(literal_suffix(rest)); + } + b'\r' => match bytes.next() { + Some((_, b'\n')) => {} + _ => break, + }, + b'\0' => break, + _ => {} + } + } + Err(Reject) +} + +fn cooked_c_string(mut input: Cursor) -> Result { + let mut chars = input.char_indices(); + + while let Some((i, ch)) = chars.next() { + match ch { + '"' => { + let input = input.advance(i + 1); + return Ok(literal_suffix(input)); + } + '\r' => match chars.next() { + Some((_, '\n')) => {} + _ => break, + }, + '\\' => match chars.next() { + Some((_, 'x')) => { + backslash_x_nonzero(&mut chars)?; + } + Some((_, 'n' | 'r' | 't' | '\\' | '\'' | '"')) => {} + Some((_, 'u')) => { + if backslash_u(&mut chars)? == '\0' { + break; + } + } + Some((newline, ch @ ('\n' | '\r'))) => { + input = input.advance(newline + 1); + trailing_backslash(&mut input, ch as u8)?; + chars = input.char_indices(); + } + _ => break, + }, + '\0' => break, + _ch => {} + } + } + Err(Reject) +} + +fn byte(input: Cursor) -> Result { + let input = input.parse("b'")?; + let mut bytes = input.bytes().enumerate(); + let ok = match bytes.next().map(|(_, b)| b) { + Some(b'\\') => match bytes.next().map(|(_, b)| b) { + Some(b'x') => backslash_x_byte(&mut bytes).is_ok(), + Some(b'n' | b'r' | b't' | b'\\' | b'0' | b'\'' | b'"') => true, + _ => false, + }, + b => b.is_some(), + }; + if !ok { + return Err(Reject); + } + let (offset, _) = bytes.next().ok_or(Reject)?; + if !input.chars().as_str().is_char_boundary(offset) { + return Err(Reject); + } + let input = input.advance(offset).parse("'")?; + Ok(literal_suffix(input)) +} + +fn character(input: Cursor) -> Result { + let input = input.parse("'")?; + let mut chars = input.char_indices(); + let ok = match chars.next().map(|(_, ch)| ch) { + Some('\\') => match chars.next().map(|(_, ch)| ch) { + Some('x') => backslash_x_char(&mut chars).is_ok(), + Some('u') => backslash_u(&mut chars).is_ok(), + Some('n' | 'r' | 't' | '\\' | '0' | '\'' | '"') => true, + _ => false, + }, + ch => ch.is_some(), + }; + if !ok { + return Err(Reject); + } + let (idx, _) = chars.next().ok_or(Reject)?; + let input = input.advance(idx).parse("'")?; + Ok(literal_suffix(input)) +} + +macro_rules! next_ch { + ($chars:ident @ $pat:pat) => { + match $chars.next() { + Some((_, ch)) => match ch { + $pat => ch, + _ => return Err(Reject), + }, + None => return Err(Reject), + } + }; +} + +fn backslash_x_char(chars: &mut I) -> Result<(), Reject> +where + I: Iterator, +{ + next_ch!(chars @ '0'..='7'); + next_ch!(chars @ '0'..='9' | 'a'..='f' | 'A'..='F'); + Ok(()) +} + +fn backslash_x_byte(chars: &mut I) -> Result<(), Reject> +where + I: Iterator, +{ + next_ch!(chars @ b'0'..=b'9' | b'a'..=b'f' | b'A'..=b'F'); + next_ch!(chars @ b'0'..=b'9' | b'a'..=b'f' | b'A'..=b'F'); + Ok(()) +} + +fn backslash_x_nonzero(chars: &mut I) -> Result<(), Reject> +where + I: Iterator, +{ + let first = next_ch!(chars @ '0'..='9' | 'a'..='f' | 'A'..='F'); + let second = next_ch!(chars @ '0'..='9' | 'a'..='f' | 'A'..='F'); + if first == '0' && second == '0' { + Err(Reject) + } else { + Ok(()) + } +} + +fn backslash_u(chars: &mut I) -> Result +where + I: Iterator, +{ + next_ch!(chars @ '{'); + let mut value = 0; + let mut len = 0; + for (_, ch) in chars { + let digit = match ch { + '0'..='9' => ch as u8 - b'0', + 'a'..='f' => 10 + ch as u8 - b'a', + 'A'..='F' => 10 + ch as u8 - b'A', + '_' if len > 0 => continue, + '}' if len > 0 => return char::from_u32(value).ok_or(Reject), + _ => break, + }; + if len == 6 { + break; + } + value *= 0x10; + value += u32::from(digit); + len += 1; + } + Err(Reject) +} + +fn trailing_backslash(input: &mut Cursor, mut last: u8) -> Result<(), Reject> { + let mut whitespace = input.bytes().enumerate(); + loop { + if last == b'\r' && whitespace.next().map_or(true, |(_, b)| b != b'\n') { + return Err(Reject); + } + match whitespace.next() { + Some((_, b @ (b' ' | b'\t' | b'\n' | b'\r'))) => { + last = b; + } + Some((offset, _)) => { + *input = input.advance(offset); + return Ok(()); + } + None => return Err(Reject), + } + } +} + +fn float(input: Cursor) -> Result { + let mut rest = float_digits(input)?; + if let Some(ch) = rest.chars().next() { + if is_ident_start(ch) { + rest = ident_not_raw(rest)?.0; + } + } + word_break(rest) +} + +fn float_digits(input: Cursor) -> Result { + let mut chars = input.chars().peekable(); + match chars.next() { + Some(ch) if '0' <= ch && ch <= '9' => {} + _ => return Err(Reject), + } + + let mut len = 1; + let mut has_dot = false; + let mut has_exp = false; + while let Some(&ch) = chars.peek() { + match ch { + '0'..='9' | '_' => { + chars.next(); + len += 1; + } + '.' => { + if has_dot { + break; + } + chars.next(); + if chars + .peek() + .map_or(false, |&ch| ch == '.' || is_ident_start(ch)) + { + return Err(Reject); + } + len += 1; + has_dot = true; + } + 'e' | 'E' => { + chars.next(); + len += 1; + has_exp = true; + break; + } + _ => break, + } + } + + if !(has_dot || has_exp) { + return Err(Reject); + } + + if has_exp { + let token_before_exp = if has_dot { + Ok(input.advance(len - 1)) + } else { + Err(Reject) + }; + let mut has_sign = false; + let mut has_exp_value = false; + while let Some(&ch) = chars.peek() { + match ch { + '+' | '-' => { + if has_exp_value { + break; + } + if has_sign { + return token_before_exp; + } + chars.next(); + len += 1; + has_sign = true; + } + '0'..='9' => { + chars.next(); + len += 1; + has_exp_value = true; + } + '_' => { + chars.next(); + len += 1; + } + _ => break, + } + } + if !has_exp_value { + return token_before_exp; + } + } + + Ok(input.advance(len)) +} + +fn int(input: Cursor) -> Result { + let mut rest = digits(input)?; + if let Some(ch) = rest.chars().next() { + if is_ident_start(ch) { + rest = ident_not_raw(rest)?.0; + } + } + word_break(rest) +} + +fn digits(mut input: Cursor) -> Result { + let base = if input.starts_with("0x") { + input = input.advance(2); + 16 + } else if input.starts_with("0o") { + input = input.advance(2); + 8 + } else if input.starts_with("0b") { + input = input.advance(2); + 2 + } else { + 10 + }; + + let mut len = 0; + let mut empty = true; + for b in input.bytes() { + match b { + b'0'..=b'9' => { + let digit = (b - b'0') as u64; + if digit >= base { + return Err(Reject); + } + } + b'a'..=b'f' => { + let digit = 10 + (b - b'a') as u64; + if digit >= base { + break; + } + } + b'A'..=b'F' => { + let digit = 10 + (b - b'A') as u64; + if digit >= base { + break; + } + } + b'_' => { + if empty && base == 10 { + return Err(Reject); + } + len += 1; + continue; + } + _ => break, + } + len += 1; + empty = false; + } + if empty { + Err(Reject) + } else { + Ok(input.advance(len)) + } +} + +fn punct(input: Cursor) -> PResult { + let (rest, ch) = punct_char(input)?; + if ch == '\'' { + let (after_lifetime, _ident) = ident_any(rest)?; + if after_lifetime.starts_with_char('\'') + || (after_lifetime.starts_with_char('#') && !rest.starts_with("r#")) + { + Err(Reject) + } else { + Ok((rest, Punct::new('\'', Spacing::Joint))) + } + } else { + let kind = match punct_char(rest) { + Ok(_) => Spacing::Joint, + Err(Reject) => Spacing::Alone, + }; + Ok((rest, Punct::new(ch, kind))) + } +} + +fn punct_char(input: Cursor) -> PResult { + if input.starts_with("//") || input.starts_with("/*") { + // Do not accept `/` of a comment as a punct. + return Err(Reject); + } + + let mut chars = input.chars(); + let first = match chars.next() { + Some(ch) => ch, + None => { + return Err(Reject); + } + }; + let recognized = "~!@#$%^&*-=+|;:,<.>/?'"; + if recognized.contains(first) { + Ok((input.advance(first.len_utf8()), first)) + } else { + Err(Reject) + } +} + +fn doc_comment<'a>(input: Cursor<'a>, trees: &mut TokenStreamBuilder) -> PResult<'a, ()> { + #[cfg(span_locations)] + let lo = input.off; + let (rest, (comment, inner)) = doc_comment_contents(input)?; + let fallback_span = Span { + #[cfg(span_locations)] + lo, + #[cfg(span_locations)] + hi: rest.off, + }; + let span = crate::Span::_new_fallback(fallback_span); + + let mut scan_for_bare_cr = comment; + while let Some(cr) = scan_for_bare_cr.find('\r') { + let rest = &scan_for_bare_cr[cr + 1..]; + if !rest.starts_with('\n') { + return Err(Reject); + } + scan_for_bare_cr = rest; + } + + let mut pound = Punct::new('#', Spacing::Alone); + pound.set_span(span); + trees.push_token_from_parser(TokenTree::Punct(pound)); + + if inner { + let mut bang = Punct::new('!', Spacing::Alone); + bang.set_span(span); + trees.push_token_from_parser(TokenTree::Punct(bang)); + } + + let doc_ident = crate::Ident::_new_fallback(Ident::new_unchecked("doc", fallback_span)); + let mut equal = Punct::new('=', Spacing::Alone); + equal.set_span(span); + let mut literal = crate::Literal::_new_fallback(Literal::string(comment)); + literal.set_span(span); + let mut bracketed = TokenStreamBuilder::with_capacity(3); + bracketed.push_token_from_parser(TokenTree::Ident(doc_ident)); + bracketed.push_token_from_parser(TokenTree::Punct(equal)); + bracketed.push_token_from_parser(TokenTree::Literal(literal)); + let group = Group::new(Delimiter::Bracket, bracketed.build()); + let mut group = crate::Group::_new_fallback(group); + group.set_span(span); + trees.push_token_from_parser(TokenTree::Group(group)); + + Ok((rest, ())) +} + +fn doc_comment_contents(input: Cursor) -> PResult<(&str, bool)> { + if input.starts_with("//!") { + let input = input.advance(3); + let (input, s) = take_until_newline_or_eof(input); + Ok((input, (s, true))) + } else if input.starts_with("/*!") { + let (input, s) = block_comment(input)?; + Ok((input, (&s[3..s.len() - 2], true))) + } else if input.starts_with("///") { + let input = input.advance(3); + if input.starts_with_char('/') { + return Err(Reject); + } + let (input, s) = take_until_newline_or_eof(input); + Ok((input, (s, false))) + } else if input.starts_with("/**") && !input.rest[3..].starts_with('*') { + let (input, s) = block_comment(input)?; + Ok((input, (&s[3..s.len() - 2], false))) + } else { + Err(Reject) + } +} + +fn take_until_newline_or_eof(input: Cursor) -> (Cursor, &str) { + let chars = input.char_indices(); + + for (i, ch) in chars { + if ch == '\n' { + return (input.advance(i), &input.rest[..i]); + } else if ch == '\r' && input.rest[i + 1..].starts_with('\n') { + return (input.advance(i + 1), &input.rest[..i]); + } + } + + (input.advance(input.len()), input.rest) +} -- cgit v1.3.1