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rewrite lexer

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nora 2022-06-21 12:56:22 +02:00
parent 0388517fd2
commit 2226d1c160
2 changed files with 205 additions and 183 deletions
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18
Cargo.lock generated
View file

@ -5,6 +5,24 @@ version = 3
[[package]] [[package]]
name = "parser" name = "parser"
version = "0.1.0" version = "0.1.0"
dependencies = [
"peekmore",
]
[[package]]
name = "peekmore"
version = "1.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ca84ba11ed2de09f9a946e35be5efe5382bdd0621780b46ea8e24a7797b5be88"
dependencies = [
"smallvec",
]
[[package]]
name = "smallvec"
version = "1.8.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
[[package]] [[package]]
name = "uwuc" name = "uwuc"

366
parser/src/lexer.rs
View file

@ -1,5 +1,13 @@
//! Contrary to popular belief, Dennis Ritchie did not invent the C grammar. //! Contrary to popular belief, Dennis Ritchie did not invent the C grammar.
//! The C grammar was brought to Dennis Ritchie by a demon in his worst dreams //! The C grammar was brought to Dennis Ritchie by a demon in his worst dreams
//!
//! Code might be bad. Possibly.
use std::ops::Not;
use peekmore::PeekMore;
type Span = std::ops::Range<usize>;
pub enum PToken { pub enum PToken {
HeaderName(Vec<u8>), HeaderName(Vec<u8>),
@ -55,9 +63,9 @@ pub enum Punctuator {
Plus, Plus,
/// - /// -
Minus, Minus,
/// ~ /// ~ (squiggly)
Tilde, Tilde,
/// ! 🔫 /// ! 🤯
Bang, Bang,
//// % //// %
Percent, Percent,
@ -70,13 +78,13 @@ pub enum Punctuator {
/// > /// >
RightChevron, RightChevron,
/// <= /// <=
LeftChevronEqual, LeftChevronEq,
/// >= /// >=
RightChevronEqual, RightChevronEq,
/// == /// ==
EqualEqual, EqEq,
/// != /// !=
BangEqual, BangEq,
/// ^ /// ^
Caret, Caret,
/// | /// |
@ -94,27 +102,27 @@ pub enum Punctuator {
/// ... /// ...
DotDotDot, DotDotDot,
/// = /// =
Equal, Eq,
/// *= /// *=
AsteriskEqual, AsteriskEq,
/// /= /// /=
SlashEqual, SlashEq,
/// %= /// %=
PercentEqual, PercentEq,
/// += /// +=
PlusEqual, PlusEq,
/// -= /// -=
MinusEqual, MinusEq,
/// <<= /// <<=
LeftLeftChevronEqual, LeftLeftChevronEq,
/// >>= /// >>=
RightRightChevronEqual, RightRightChevronEq,
/// &= /// &=
AmspersandEqual, AmspersandEq,
/// ^= /// ^=
CaretEqual, CaretEq,
/// |= /// |=
PipeEqual, PipeEq,
/// , /// ,
Comma, Comma,
/// # %: /// # %:
@ -125,77 +133,130 @@ pub enum Punctuator {
struct PLexer<I> struct PLexer<I>
where where
I: Iterator<Item = u8>, I: Iterator<Item = (usize, u8)>,
{ {
src: peekmore::PeekMoreIterator<I>, src: peekmore::PeekMoreIterator<I>,
} }
impl<I> PLexer<I> impl<I> PLexer<I>
where where
I: Iterator<Item = u8>, I: Iterator<Item = (usize, u8)>,
{ {
/// 6.4.2 Identifiers /// 6.4.2 Identifiers
/// TODO: 6.4.3 Universal character names /// TODO: 6.4.3 Universal character names
fn identifier(&mut self, c: u8) -> PToken { fn identifier(&mut self, c: u8, mut last_span: usize) -> (PToken, usize) {
let mut ident = vec![c]; let mut ident = vec![c];
while let Some(&c) = self.src.peek() { while let Some((span, c)) = self.src.peek() {
if let b'a'..=b'z' | b'A'..=b'Z' | b'_' | b'0'..=b'9' = c { let (span, c) = (*span, *c);
if c.is_c_identifier() {
self.src.next(); self.src.next();
ident.push(c); ident.push(c);
last_span = span;
} else { } else {
break; break;
} }
} }
PToken::Identifier(ident) (PToken::Identifier(ident), last_span)
} }
/// 6.4.8 Preprocessing numbers /// 6.4.8 Preprocessing numbers
fn number(&mut self, c: u8) -> PToken { fn number(&mut self, c: u8, mut last_span: usize) -> (PToken, usize) {
let mut number = vec![c]; let mut number = vec![c];
while let Some(&c) = self.src.peek() { while let Some((span, c)) = self.src.peek() {
if let b'0'..=b'9' = c { let (span, c) = (*span, *c);
if c.is_ascii_digit() {
self.src.next(); self.src.next();
number.push(c); number.push(c);
last_span = span;
} else { } else {
break; break;
} }
} }
PToken::PpNumber(number) (PToken::PpNumber(number), last_span)
} }
/// 6.4.5 String literals /// 6.4.5 String literals
fn string_literal(&mut self) -> PToken { fn string_literal(&mut self, mut last_span: usize) -> (PToken, usize) {
let mut string = Vec::new(); let mut string = Vec::new();
while let c @ b'"' = { loop {
match self.src.next() { let next = self.src.next();
Some(next) => next, match next {
None => return PToken::Error, Some((span, c)) => {
if c == b'"' {
break;
} }
} { last_span = span;
string.push(c); string.push(c);
} }
PToken::StringLiteral(string) None => return (PToken::Error, last_span),
}
} }
fn s_p(&mut self) -> Option<&u8> { (PToken::StringLiteral(string), last_span)
}
/// source peek
fn s_p(&mut self) -> Option<&(usize, u8)> {
self.src.peek() self.src.peek()
} }
fn s_p_n(&mut self, n: usize) -> Option<&u8> { /// source peek nth
fn s_p_n(&mut self, n: usize) -> Option<&(usize, u8)> {
self.src.peek_nth(n) self.src.peek_nth(n)
} }
} }
macro_rules! triple_punct {
($self:ident, $tok:ident) => {{
$self.src.next()?;
let (end, _) = $self.src.next()?;
break (TokP(Punctuator::$tok), end);
}};
}
macro_rules! double_punct {
($self:ident, $tok:ident) => {{
let (end, _) = $self.src.next()?;
break (TokP(Punctuator::$tok), end);
}};
}
trait CLexExt {
fn is_c_identifier_nondigit(&self) -> bool;
fn is_c_identifier_digit(&self) -> bool;
fn is_c_identifier(&self) -> bool {
self.is_c_identifier_nondigit() || self.is_c_identifier_digit()
}
fn is_c_whitespace(&self) -> bool;
}
impl CLexExt for u8 {
fn is_c_identifier_nondigit(&self) -> bool {
matches!(self, b'a'..=b'z' | b'A'..=b'Z' | b'_')
}
fn is_c_identifier_digit(&self) -> bool {
matches!(self, b'0'..=b'9')
}
fn is_c_whitespace(&self) -> bool {
self.is_ascii_whitespace() // TODO: is it?
}
}
impl<'src, I> Iterator for PLexer<I> impl<'src, I> Iterator for PLexer<I>
where where
I: Iterator<Item = u8>, I: Iterator<Item = (usize, u8)>,
{ {
type Item = PToken; type Item = (PToken, Span);
/// preprocessing-token: /// preprocessing-token:
/// header-name /// header-name
@ -208,154 +269,97 @@ where
fn next(&mut self) -> Option<Self::Item> { fn next(&mut self) -> Option<Self::Item> {
use PToken::Punctuator as TokP; use PToken::Punctuator as TokP;
loop { let (start_span, char1) = self.src.next()?;
match self.src.next()? { let char2 = self.src.peek().map(|(_, c)| *c);
c @ (b'a'..=b'z' | b'A'..=b'Z' | b'_') => { let char3 = self.src.peek_nth(2).map(|(_, c)| *c);
return Some(self.identifier(c));
let (token, end_span) = loop {
match (char1, char2, char3) {
// IDENTIFIER
(c, _, _) if c.is_c_identifier_nondigit() => {
break self.identifier(c, start_span);
} }
c @ b'0'..=b'9' => return Some(self.number(c)), // NUMBER
b'"' => return Some(self.string_literal()), (c, _, _) if c.is_c_identifier_digit() => break self.number(c, start_span),
c if c.is_ascii_whitespace() => {} // STRING
b'/' if self.s_p() == Some(&b'*') => loop { (b'"', _, _) => break self.string_literal(start_span),
let first = self.src.next()?; // WHITESPACE
let second = self.s_p(); (c, _, _) if c.is_c_whitespace() => {}
if first == b'*' && second == Some(&b'/') { // COMMENTS
(b'/', Some(b'*'), _) => loop {
let (_, first) = self.src.next()?;
let second = self.s_p().map(|(_, c)| *c);
if first == b'*' && second == Some(b'/') {
self.src.next(); self.src.next();
break;
} }
}, },
b'/' if self.s_p() == Some(&b'/') => while self.src.next() != Some(b'\n') {}, (b'/', Some(b'/'), _) => while matches!(self.src.next(), Some((_, b'\n'))).not() {},
b'.' if self.s_p() == Some(&b'.') && self.s_p_n(2) == Some(&b'.') => { // TRIPLE CHARACTER PUNCTUATION
self.src.next(); (b'.', Some(b'.'), Some(b'.')) => triple_punct!(self, DotDotDot),
self.src.next(); (b'<', Some(b'<'), Some(b'=')) => triple_punct!(self, LeftLeftChevronEq),
return Some(TokP(Punctuator::LeftLeftChevronEqual)); (b'>', Some(b'>'), Some(b'=')) => triple_punct!(self, RightRightChevronEq),
} // DOUBLE CHARACTER PUNCTUATION
b'<' if self.s_p() == Some(&b'<') && self.s_p_n(2) == Some(&b'=') => { (b'<', Some(b':'), _) => double_punct!(self, BracketOpen),
self.src.next(); (b':', Some(b'>'), _) => double_punct!(self, BracketClose),
self.src.next(); (b'<', Some(b'%'), _) => double_punct!(self, BraceOpen),
return Some(TokP(Punctuator::LeftLeftChevronEqual)); (b'%', Some(b'>'), _) => double_punct!(self, BraceClose),
} (b'-', Some(b'>'), _) => double_punct!(self, Arrow),
b'>' if self.s_p() == Some(&b'>') && self.s_p_n(2) == Some(&b'=') => { (b'+', Some(b'+'), _) => double_punct!(self, PlusPlus),
self.src.next(); (b'-', Some(b'-'), _) => double_punct!(self, MinusMinus),
self.src.next(); (b'<', Some(b'<'), _) => double_punct!(self, LeftLeftChevron),
return Some(TokP(Punctuator::RightRightChevronEqual)); (b'>', Some(b'>'), _) => double_punct!(self, RightRightChevron),
} (b'<', Some(b'='), _) => double_punct!(self, PlusPlus),
b'<' if self.s_p() == Some(&b':') => { (b'>', Some(b'='), _) => double_punct!(self, RightChevronEq),
self.src.next(); (b'=', Some(b'='), _) => double_punct!(self, EqEq),
return Some(TokP(Punctuator::BracketOpen)); (b'!', Some(b'='), _) => double_punct!(self, BangEq),
} (b'&', Some(b'&'), _) => double_punct!(self, AmpersandAmpersand),
b':' if self.s_p() == Some(&b'>') => { (b'|', Some(b'|'), _) => double_punct!(self, PipePipe),
self.src.next(); (b'*', Some(b'='), _) => double_punct!(self, AsteriskEq),
return Some(TokP(Punctuator::BracketClose)); (b'/', Some(b'='), _) => double_punct!(self, SlashEq),
} (b'%', Some(b'='), _) => double_punct!(self, PercentEq),
b'<' if self.s_p() == Some(&b'%') => { (b'+', Some(b'='), _) => double_punct!(self, PlusEq),
self.src.next(); (b'-', Some(b'='), _) => double_punct!(self, MinusEq),
return Some(TokP(Punctuator::BraceOpen)); (b'&', Some(b'='), _) => double_punct!(self, AmspersandEq),
} (b'^', Some(b'='), _) => double_punct!(self, CaretEq),
b'%' if self.s_p() == Some(&b'>') => { (b'|', Some(b'='), _) => double_punct!(self, PipeEq),
self.src.next(); // SINGLE CHARACTER PUNCTUATION
return Some(TokP(Punctuator::BraceClose)); (b'[', _, _) => break (TokP(Punctuator::BracketOpen), start_span),
} (b']', _, _) => break (TokP(Punctuator::BracketClose), start_span),
b'-' if self.s_p() == Some(&b'>') => { (b'(', _, _) => break (TokP(Punctuator::ParenOpen), start_span),
self.src.next(); (b'{', _, _) => break (TokP(Punctuator::BraceOpen), start_span),
return Some(TokP(Punctuator::Arrow)); (b')', _, _) => break (TokP(Punctuator::ParenClose), start_span),
} (b'}', _, _) => break (TokP(Punctuator::BraceClose), start_span),
b'+' if self.s_p() == Some(&b'+') => { (b'.', _, _) => break (TokP(Punctuator::Dot), start_span),
self.src.next(); (b'&', _, _) => break (TokP(Punctuator::Ampersand), start_span),
return Some(TokP(Punctuator::PlusPlus)); (b'*', _, _) => break (TokP(Punctuator::Asterisk), start_span),
} (b'-', _, _) => break (TokP(Punctuator::Minus), start_span),
b'-' if self.s_p() == Some(&b'-') => { (b'~', _, _) => break (TokP(Punctuator::Tilde), start_span),
self.src.next(); (b'!', _, _) => break (TokP(Punctuator::Bang), start_span),
return Some(TokP(Punctuator::Minus)); (b'%', _, _) => break (TokP(Punctuator::Percent), start_span),
} (b'<', _, _) => break (TokP(Punctuator::LeftChevron), start_span),
b'<' if self.s_p() == Some(&b'<') => { (b'>', _, _) => break (TokP(Punctuator::RightChevron), start_span),
self.src.next(); (b'^', _, _) => break (TokP(Punctuator::Caret), start_span),
return Some(TokP(Punctuator::LeftLeftChevron)); (b'|', _, _) => break (TokP(Punctuator::Pipe), start_span),
} (b'?', _, _) => break (TokP(Punctuator::QuestionMark), start_span),
b'>' if self.s_p() == Some(&b'>') => { (b':', _, _) => break (TokP(Punctuator::Colon), start_span),
self.src.next(); (b';', _, _) => break (TokP(Punctuator::Semicolon), start_span),
return Some(TokP(Punctuator::RightRightChevron)); (b'=', _, _) => break (TokP(Punctuator::Eq), start_span),
} (b',', _, _) => break (TokP(Punctuator::Comma), start_span),
b'<' if self.s_p() == Some(&b'=') => { (b'#', _, _) => break (TokP(Punctuator::Hash), start_span),
self.src.next(); (c, _, _) => break (PToken::OtherNonWs(c), start_span),
return Some(TokP(Punctuator::LeftChevronEqual));
}
b'>' if self.s_p() == Some(&b'=') => {
self.src.next();
return Some(TokP(Punctuator::RightChevronEqual));
}
b'=' if self.s_p() == Some(&b'=') => {
self.src.next();
return Some(TokP(Punctuator::EqualEqual));
}
b'!' if self.s_p() == Some(&b'=') => {
self.src.next();
return Some(TokP(Punctuator::BangEqual));
}
b'&' if self.s_p() == Some(&b'&') => {
self.src.next();
return Some(TokP(Punctuator::AmpersandAmpersand));
}
b'|' if self.s_p() == Some(&b'|') => {
self.src.next();
return Some(TokP(Punctuator::PipePipe));
}
b'*' if self.s_p() == Some(&b'=') => {
self.src.next();
return Some(TokP(Punctuator::AsteriskEqual));
}
b'/' if self.s_p() == Some(&b'=') => {
self.src.next();
return Some(TokP(Punctuator::SlashEqual));
}
b'%' if self.s_p() == Some(&b'=') => {
self.src.next();
return Some(TokP(Punctuator::PercentEqual));
}
b'+' if self.s_p() == Some(&b'=') => {
self.src.next();
return Some(TokP(Punctuator::PlusEqual));
}
b'-' if self.s_p() == Some(&b'=') => {
self.src.next();
return Some(TokP(Punctuator::MinusEqual));
}
b'&' if self.s_p() == Some(&b'=') => {
self.src.next();
return Some(TokP(Punctuator::AmspersandEqual));
}
b'^' if self.s_p() == Some(&b'=') => {
self.src.next();
return Some(TokP(Punctuator::CaretEqual));
}
b'|' if self.s_p() == Some(&b'=') => {
self.src.next();
return Some(TokP(Punctuator::PipeEqual));
}
b'[' => return Some(TokP(Punctuator::BracketOpen)),
b']' => return Some(TokP(Punctuator::BracketClose)),
b'(' => return Some(TokP(Punctuator::ParenOpen)),
b'{' => return Some(TokP(Punctuator::BraceOpen)),
b')' => return Some(TokP(Punctuator::ParenClose)),
b'}' => return Some(TokP(Punctuator::BraceClose)),
b'.' => return Some(TokP(Punctuator::Dot)),
b'&' => return Some(TokP(Punctuator::Ampersand)),
b'*' => return Some(TokP(Punctuator::Asterisk)),
b'-' => return Some(TokP(Punctuator::Minus)),
b'~' => return Some(TokP(Punctuator::Tilde)),
b'!' => return Some(TokP(Punctuator::Bang)),
b'%' => return Some(TokP(Punctuator::Percent)),
b'<' => return Some(TokP(Punctuator::LeftChevron)),
b'>' => return Some(TokP(Punctuator::RightChevron)),
b'^' => return Some(TokP(Punctuator::Caret)),
b'|' => return Some(TokP(Punctuator::Pipe)),
b'?' => return Some(TokP(Punctuator::QuestionMark)),
b':' => return Some(TokP(Punctuator::Colon)),
b';' => return Some(TokP(Punctuator::Semicolon)),
b'=' => return Some(TokP(Punctuator::Equal)),
b',' => return Some(TokP(Punctuator::Comma)),
b'#' => return Some(TokP(Punctuator::Hash)),
c => return Some(PToken::OtherNonWs(c)),
} }
};
Some((token, start_span..end_span + 1))
} }
} }
pub fn preprocess_tokens(
src: impl Iterator<Item = (usize, u8)>,
) -> impl Iterator<Item = (PToken, std::ops::Range<usize>)> {
let lexer = PLexer {
src: src.peekmore(),
};
lexer
} }