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cl-token: Break operators into their own separate enum, to make future pratt parsing easier

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This commit is contained in:
John 2024-04-12 16:20:24 -05:00
parent 2091cce570
commit 290ede2fa3
4 changed files with 304 additions and 250 deletions
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117
cl-lexer/src/lib.rs
View File

@ -2,7 +2,7 @@
#![warn(clippy::all)]
#![feature(decl_macro)]
use cl_structures::span::Loc;
use cl_token::{TokenKind as Kind, *};
use cl_token::{token_type::Op, TokenKind as Kind, *};
use std::{
iter::Peekable,
str::{Chars, FromStr},
@ -97,33 +97,33 @@ impl<'t> Lexer<'t> {
/// Scans through the text, searching for the next [Token]
pub fn scan(&mut self) -> LResult<Token> {
match self.skip_whitespace().peek()? {
'{' => self.consume()?.produce(Kind::LCurly, ()),
'}' => self.consume()?.produce(Kind::RCurly, ()),
'[' => self.consume()?.produce(Kind::LBrack, ()),
']' => self.consume()?.produce(Kind::RBrack, ()),
'(' => self.consume()?.produce(Kind::LParen, ()),
')' => self.consume()?.produce(Kind::RParen, ()),
'{' => self.consume()?.produce_op(Op::LCurly),
'}' => self.consume()?.produce_op(Op::RCurly),
'[' => self.consume()?.produce_op(Op::LBrack),
']' => self.consume()?.produce_op(Op::RBrack),
'(' => self.consume()?.produce_op(Op::LParen),
')' => self.consume()?.produce_op(Op::RParen),
'&' => self.consume()?.amp(),
'@' => self.consume()?.produce(Kind::At, ()),
'\\' => self.consume()?.produce(Kind::Backslash, ()),
'@' => self.consume()?.produce_op(Op::At),
'\\' => self.consume()?.produce_op(Op::Backslash),
'!' => self.consume()?.bang(),
'|' => self.consume()?.bar(),
':' => self.consume()?.colon(),
',' => self.consume()?.produce(Kind::Comma, ()),
',' => self.consume()?.produce_op(Op::Comma),
'.' => self.consume()?.dot(),
'=' => self.consume()?.equal(),
'`' => self.consume()?.produce(Kind::Grave, ()),
'`' => self.consume()?.produce_op(Op::Grave),
'>' => self.consume()?.greater(),
'#' => self.consume()?.hash(),
'<' => self.consume()?.less(),
'-' => self.consume()?.minus(),
'+' => self.consume()?.plus(),
'?' => self.consume()?.produce(Kind::Question, ()),
'?' => self.consume()?.produce_op(Op::Question),
'%' => self.consume()?.rem(),
';' => self.consume()?.produce(Kind::Semi, ()),
';' => self.consume()?.produce_op(Op::Semi),
'/' => self.consume()?.slash(),
'*' => self.consume()?.star(),
'~' => self.consume()?.produce(Kind::Tilde, ()),
'~' => self.consume()?.produce_op(Op::Tilde),
'^' => self.consume()?.xor(),
'0' => self.consume()?.int_with_base(),
'1'..='9' => self.digits::<10>(),
@ -157,11 +157,14 @@ impl<'t> Lexer<'t> {
.copied()
.ok_or(Error::end_of_file(self.line(), self.col()))
}
fn produce(&mut self, ty: TokenKind, data: impl Into<TokenData>) -> LResult<Token> {
fn produce(&mut self, kind: TokenKind, data: impl Into<TokenData>) -> LResult<Token> {
let loc = self.start_loc;
self.start_loc = self.current_loc;
self.start = self.current;
Ok(Token::new(ty, data, loc.0, loc.1))
Ok(Token::new(kind, data, loc.0, loc.1))
}
fn produce_op(&mut self, kind: Op) -> LResult<Token> {
self.produce(TokenKind::Op(kind), ())
}
fn skip_whitespace(&mut self) -> &mut Self {
while let Ok(c) = self.peek() {
@ -192,120 +195,120 @@ impl<'t> Lexer<'t> {
impl<'t> Lexer<'t> {
fn amp(&mut self) -> LResult<Token> {
match self.peek() {
Ok('&') => self.consume()?.produce(Kind::AmpAmp, ()),
Ok('=') => self.consume()?.produce(Kind::AmpEq, ()),
_ => self.produce(Kind::Amp, ()),
Ok('&') => self.consume()?.produce_op(Op::AmpAmp),
Ok('=') => self.consume()?.produce_op(Op::AmpEq),
_ => self.produce_op(Op::Amp),
}
}
fn bang(&mut self) -> LResult<Token> {
match self.peek() {
Ok('!') => self.consume()?.produce(Kind::BangBang, ()),
Ok('=') => self.consume()?.produce(Kind::BangEq, ()),
_ => self.produce(Kind::Bang, ()),
Ok('!') => self.consume()?.produce_op(Op::BangBang),
Ok('=') => self.consume()?.produce_op(Op::BangEq),
_ => self.produce_op(Op::Bang),
}
}
fn bar(&mut self) -> LResult<Token> {
match self.peek() {
Ok('|') => self.consume()?.produce(Kind::BarBar, ()),
Ok('=') => self.consume()?.produce(Kind::BarEq, ()),
_ => self.produce(Kind::Bar, ()),
Ok('|') => self.consume()?.produce_op(Op::BarBar),
Ok('=') => self.consume()?.produce_op(Op::BarEq),
_ => self.produce_op(Op::Bar),
}
}
fn colon(&mut self) -> LResult<Token> {
match self.peek() {
Ok(':') => self.consume()?.produce(Kind::ColonColon, ()),
_ => self.produce(Kind::Colon, ()),
Ok(':') => self.consume()?.produce_op(Op::ColonColon),
_ => self.produce_op(Op::Colon),
}
}
fn dot(&mut self) -> LResult<Token> {
match self.peek() {
Ok('.') => {
if let Ok('=') = self.consume()?.peek() {
self.consume()?.produce(Kind::DotDotEq, ())
self.consume()?.produce_op(Op::DotDotEq)
} else {
self.produce(Kind::DotDot, ())
self.produce_op(Op::DotDot)
}
}
_ => self.produce(Kind::Dot, ()),
_ => self.produce_op(Op::Dot),
}
}
fn equal(&mut self) -> LResult<Token> {
match self.peek() {
Ok('=') => self.consume()?.produce(Kind::EqEq, ()),
Ok('>') => self.consume()?.produce(Kind::FatArrow, ()),
_ => self.produce(Kind::Eq, ()),
Ok('=') => self.consume()?.produce_op(Op::EqEq),
Ok('>') => self.consume()?.produce_op(Op::FatArrow),
_ => self.produce_op(Op::Eq),
}
}
fn greater(&mut self) -> LResult<Token> {
match self.peek() {
Ok('=') => self.consume()?.produce(Kind::GtEq, ()),
Ok('=') => self.consume()?.produce_op(Op::GtEq),
Ok('>') => {
if let Ok('=') = self.consume()?.peek() {
self.consume()?.produce(Kind::GtGtEq, ())
self.consume()?.produce_op(Op::GtGtEq)
} else {
self.produce(Kind::GtGt, ())
self.produce_op(Op::GtGt)
}
}
_ => self.produce(Kind::Gt, ()),
_ => self.produce_op(Op::Gt),
}
}
fn hash(&mut self) -> LResult<Token> {
match self.peek() {
Ok('!') => self.consume()?.produce(Kind::HashBang, ()),
_ => self.produce(Kind::Hash, ()),
Ok('!') => self.consume()?.produce_op(Op::HashBang),
_ => self.produce_op(Op::Hash),
}
}
fn less(&mut self) -> LResult<Token> {
match self.peek() {
Ok('=') => self.consume()?.produce(Kind::LtEq, ()),
Ok('=') => self.consume()?.produce_op(Op::LtEq),
Ok('<') => {
if let Ok('=') = self.consume()?.peek() {
self.consume()?.produce(Kind::LtLtEq, ())
self.consume()?.produce_op(Op::LtLtEq)
} else {
self.produce(Kind::LtLt, ())
self.produce_op(Op::LtLt)
}
}
_ => self.produce(Kind::Lt, ()),
_ => self.produce_op(Op::Lt),
}
}
fn minus(&mut self) -> LResult<Token> {
match self.peek() {
Ok('=') => self.consume()?.produce(Kind::MinusEq, ()),
Ok('>') => self.consume()?.produce(Kind::Arrow, ()),
_ => self.produce(Kind::Minus, ()),
Ok('=') => self.consume()?.produce_op(Op::MinusEq),
Ok('>') => self.consume()?.produce_op(Op::Arrow),
_ => self.produce_op(Op::Minus),
}
}
fn plus(&mut self) -> LResult<Token> {
match self.peek() {
Ok('=') => self.consume()?.produce(Kind::PlusEq, ()),
_ => self.produce(Kind::Plus, ()),
Ok('=') => self.consume()?.produce_op(Op::PlusEq),
_ => self.produce_op(Op::Plus),
}
}
fn rem(&mut self) -> LResult<Token> {
match self.peek() {
Ok('=') => self.consume()?.produce(Kind::RemEq, ()),
_ => self.produce(Kind::Rem, ()),
Ok('=') => self.consume()?.produce_op(Op::RemEq),
_ => self.produce_op(Op::Rem),
}
}
fn slash(&mut self) -> LResult<Token> {
match self.peek() {
Ok('=') => self.consume()?.produce(Kind::SlashEq, ()),
Ok('=') => self.consume()?.produce_op(Op::SlashEq),
Ok('/') => self.consume()?.line_comment(),
Ok('*') => self.consume()?.block_comment(),
_ => self.produce(Kind::Slash, ()),
_ => self.produce_op(Op::Slash),
}
}
fn star(&mut self) -> LResult<Token> {
match self.peek() {
Ok('=') => self.consume()?.produce(Kind::StarEq, ()),
_ => self.produce(Kind::Star, ()),
Ok('=') => self.consume()?.produce_op(Op::StarEq),
_ => self.produce_op(Op::Star),
}
}
fn xor(&mut self) -> LResult<Token> {
match self.peek() {
Ok('=') => self.consume()?.produce(Kind::XorEq, ()),
Ok('^') => self.consume()?.produce(Kind::XorXor, ()),
_ => self.produce(Kind::Xor, ()),
Ok('=') => self.consume()?.produce_op(Op::XorEq),
Ok('^') => self.consume()?.produce_op(Op::XorXor),
_ => self.produce_op(Op::Xor),
}
}
}

109
cl-lexer/src/tests.rs
View File

@ -109,59 +109,64 @@ mod string {
}
}
mod punct {
use cl_token::token_type::Op;
macro op($op:ident) {
TokenKind::Op(Op::$op)
}
use super::*;
test_lexer_output_type! {
l_curly { "{ {" => [ TokenKind::LCurly, TokenKind::LCurly ] }
r_curly { "} }" => [ TokenKind::RCurly, TokenKind::RCurly ] }
l_brack { "[ [" => [ TokenKind::LBrack, TokenKind::LBrack ] }
r_brack { "] ]" => [ TokenKind::RBrack, TokenKind::RBrack ] }
l_paren { "( (" => [ TokenKind::LParen, TokenKind::LParen ] }
r_paren { ") )" => [ TokenKind::RParen, TokenKind::RParen ] }
amp { "& &" => [ TokenKind::Amp, TokenKind::Amp ] }
amp_amp { "&& &&" => [ TokenKind::AmpAmp, TokenKind::AmpAmp ] }
amp_eq { "&= &=" => [ TokenKind::AmpEq, TokenKind::AmpEq ] }
arrow { "-> ->" => [ TokenKind::Arrow, TokenKind::Arrow] }
at { "@ @" => [ TokenKind::At, TokenKind::At] }
backslash { "\\ \\" => [ TokenKind::Backslash, TokenKind::Backslash] }
bang { "! !" => [ TokenKind::Bang, TokenKind::Bang] }
bangbang { "!! !!" => [ TokenKind::BangBang, TokenKind::BangBang] }
bangeq { "!= !=" => [ TokenKind::BangEq, TokenKind::BangEq] }
bar { "| |" => [ TokenKind::Bar, TokenKind::Bar] }
barbar { "|| ||" => [ TokenKind::BarBar, TokenKind::BarBar] }
bareq { "|= |=" => [ TokenKind::BarEq, TokenKind::BarEq] }
colon { ": :" => [ TokenKind::Colon, TokenKind::Colon] }
comma { ", ," => [ TokenKind::Comma, TokenKind::Comma] }
dot { ". ." => [ TokenKind::Dot, TokenKind::Dot] }
dotdot { ".. .." => [ TokenKind::DotDot, TokenKind::DotDot] }
dotdoteq { "..= ..=" => [ TokenKind::DotDotEq, TokenKind::DotDotEq] }
eq { "= =" => [ TokenKind::Eq, TokenKind::Eq] }
eqeq { "== ==" => [ TokenKind::EqEq, TokenKind::EqEq] }
fatarrow { "=> =>" => [ TokenKind::FatArrow, TokenKind::FatArrow] }
grave { "` `" => [ TokenKind::Grave, TokenKind::Grave] }
gt { "> >" => [ TokenKind::Gt, TokenKind::Gt] }
gteq { ">= >=" => [ TokenKind::GtEq, TokenKind::GtEq] }
gtgt { ">> >>" => [ TokenKind::GtGt, TokenKind::GtGt] }
gtgteq { ">>= >>=" => [ TokenKind::GtGtEq, TokenKind::GtGtEq] }
hash { "# #" => [ TokenKind::Hash, TokenKind::Hash] }
lt { "< <" => [ TokenKind::Lt, TokenKind::Lt] }
lteq { "<= <=" => [ TokenKind::LtEq, TokenKind::LtEq] }
ltlt { "<< <<" => [ TokenKind::LtLt, TokenKind::LtLt] }
ltlteq { "<<= <<=" => [ TokenKind::LtLtEq, TokenKind::LtLtEq] }
minus { "- -" => [ TokenKind::Minus, TokenKind::Minus] }
minuseq { "-= -=" => [ TokenKind::MinusEq, TokenKind::MinusEq] }
plus { "+ +" => [ TokenKind::Plus, TokenKind::Plus] }
pluseq { "+= +=" => [ TokenKind::PlusEq, TokenKind::PlusEq] }
question { "? ?" => [ TokenKind::Question, TokenKind::Question] }
rem { "% %" => [ TokenKind::Rem, TokenKind::Rem] }
remeq { "%= %=" => [ TokenKind::RemEq, TokenKind::RemEq] }
semi { "; ;" => [ TokenKind::Semi, TokenKind::Semi] }
slash { "/ /" => [ TokenKind::Slash, TokenKind::Slash] }
slasheq { "/= /=" => [ TokenKind::SlashEq, TokenKind::SlashEq] }
star { "* *" => [ TokenKind::Star, TokenKind::Star] }
stareq { "*= *=" => [ TokenKind::StarEq, TokenKind::StarEq] }
tilde { "~ ~" => [ TokenKind::Tilde, TokenKind::Tilde] }
xor { "^ ^" => [ TokenKind::Xor, TokenKind::Xor] }
xoreq { "^= ^=" => [ TokenKind::XorEq, TokenKind::XorEq] }
xorxor { "^^ ^^" => [ TokenKind::XorXor, TokenKind::XorXor] }
l_curly { "{ {" => [ op!(LCurly), op!(LCurly) ] }
r_curly { "} }" => [ op!(RCurly), op!(RCurly) ] }
l_brack { "[ [" => [ op!(LBrack), op!(LBrack) ] }
r_brack { "] ]" => [ op!(RBrack), op!(RBrack) ] }
l_paren { "( (" => [ op!(LParen), op!(LParen) ] }
r_paren { ") )" => [ op!(RParen), op!(RParen) ] }
amp { "& &" => [ op!(Amp), op!(Amp) ] }
amp_amp { "&& &&" => [ op!(AmpAmp), op!(AmpAmp) ] }
amp_eq { "&= &=" => [ op!(AmpEq), op!(AmpEq) ] }
arrow { "-> ->" => [ op!(Arrow), op!(Arrow)] }
at { "@ @" => [ op!(At), op!(At)] }
backslash { "\\ \\" => [ op!(Backslash), op!(Backslash)] }
bang { "! !" => [ op!(Bang), op!(Bang)] }
bangbang { "!! !!" => [ op!(BangBang), op!(BangBang)] }
bangeq { "!= !=" => [ op!(BangEq), op!(BangEq)] }
bar { "| |" => [ op!(Bar), op!(Bar)] }
barbar { "|| ||" => [ op!(BarBar), op!(BarBar)] }
bareq { "|= |=" => [ op!(BarEq), op!(BarEq)] }
colon { ": :" => [ op!(Colon), op!(Colon)] }
comma { ", ," => [ op!(Comma), op!(Comma)] }
dot { ". ." => [ op!(Dot), op!(Dot)] }
dotdot { ".. .." => [ op!(DotDot), op!(DotDot)] }
dotdoteq { "..= ..=" => [ op!(DotDotEq), op!(DotDotEq)] }
eq { "= =" => [ op!(Eq), op!(Eq)] }
eqeq { "== ==" => [ op!(EqEq), op!(EqEq)] }
fatarrow { "=> =>" => [ op!(FatArrow), op!(FatArrow)] }
grave { "` `" => [ op!(Grave), op!(Grave)] }
gt { "> >" => [ op!(Gt), op!(Gt)] }
gteq { ">= >=" => [ op!(GtEq), op!(GtEq)] }
gtgt { ">> >>" => [ op!(GtGt), op!(GtGt)] }
gtgteq { ">>= >>=" => [ op!(GtGtEq), op!(GtGtEq)] }
hash { "# #" => [ op!(Hash), op!(Hash)] }
lt { "< <" => [ op!(Lt), op!(Lt)] }
lteq { "<= <=" => [ op!(LtEq), op!(LtEq)] }
ltlt { "<< <<" => [ op!(LtLt), op!(LtLt)] }
ltlteq { "<<= <<=" => [ op!(LtLtEq), op!(LtLtEq)] }
minus { "- -" => [ op!(Minus), op!(Minus)] }
minuseq { "-= -=" => [ op!(MinusEq), op!(MinusEq)] }
plus { "+ +" => [ op!(Plus), op!(Plus)] }
pluseq { "+= +=" => [ op!(PlusEq), op!(PlusEq)] }
question { "? ?" => [ op!(Question), op!(Question)] }
rem { "% %" => [ op!(Rem), op!(Rem)] }
remeq { "%= %=" => [ op!(RemEq), op!(RemEq)] }
semi { "; ;" => [ op!(Semi), op!(Semi)] }
slash { "/ /" => [ op!(Slash), op!(Slash)] }
slasheq { "/= /=" => [ op!(SlashEq), op!(SlashEq)] }
star { "* *" => [ op!(Star), op!(Star)] }
stareq { "*= *=" => [ op!(StarEq), op!(StarEq)] }
tilde { "~ ~" => [ op!(Tilde), op!(Tilde)] }
xor { "^ ^" => [ op!(Xor), op!(Xor)] }
xoreq { "^= ^=" => [ op!(XorEq), op!(XorEq)] }
xorxor { "^^ ^^" => [ op!(XorXor), op!(XorXor)] }
}
}

206
cl-parser/src/parser.rs
View File

@ -6,6 +6,7 @@ use crate::error::{
};
use cl_ast::*;
use cl_lexer::Lexer;
use cl_token::token_type::Op;
/// Parses a sequence of [Tokens](Token) into an [AST](cl_ast)
pub struct Parser<'t> {
@ -84,15 +85,19 @@ impl<'t> Parser<'t> {
Err(self.error(Expected { want, got }, while_parsing))
}
}
#[inline]
pub fn match_op(&mut self, want: Op, while_parsing: Parsing) -> PResult<Token> {
self.match_type(TokenKind::Op(want), while_parsing)
}
}
// the three matched delimiter pairs
/// Square brackets: `[` `]`
const BRACKETS: (TokenKind, TokenKind) = (TokenKind::LBrack, TokenKind::RBrack);
const BRACKETS: (TokenKind, TokenKind) = (TokenKind::Op(Op::LBrack), TokenKind::Op(Op::RBrack));
/// Curly braces: `{` `}`
const CURLIES: (TokenKind, TokenKind) = (TokenKind::LCurly, TokenKind::RCurly);
const CURLIES: (TokenKind, TokenKind) = (TokenKind::Op(Op::LCurly), TokenKind::Op(Op::RCurly));
/// Parentheses: `(` `)`
const PARENS: (TokenKind, TokenKind) = (TokenKind::LParen, TokenKind::RParen);
const PARENS: (TokenKind, TokenKind) = (TokenKind::Op(Op::LParen), TokenKind::Op(Op::RParen));
/// Parses constructions of the form `delim.0 f delim.1` (i.e. `(` `foobar` `)`)
const fn delim<'t, T>(
@ -150,7 +155,7 @@ const fn rep<'t, T>(
/// Expands to a pattern which matches item-like [Token] [TokenKind]s
macro item_like() {
TokenKind::Hash
TokenKind::Op(Op::Hash)
| TokenKind::Pub
| TokenKind::Type
| TokenKind::Const
@ -168,7 +173,7 @@ impl<'t> Parser<'t> {
pub fn file(&mut self) -> PResult<File> {
let mut items = vec![];
while match self.peek_kind(Parsing::File) {
Ok(TokenKind::RCurly) | Err(Error { reason: EndOfInput, .. }) => false,
Ok(TokenKind::Op(Op::RCurly)) | Err(Error { reason: EndOfInput, .. }) => false,
Ok(_) => true,
Err(e) => Err(e)?,
} {
@ -203,13 +208,13 @@ impl<'t> Parser<'t> {
/// See also: [Parser::path_part], [Parser::identifier]
pub fn path(&mut self) -> PResult<Path> {
const PARSING: Parsing = Parsing::PathExpr;
let absolute = matches!(self.peek_kind(PARSING)?, TokenKind::ColonColon);
let absolute = matches!(self.peek_kind(PARSING)?, TokenKind::Op(Op::ColonColon));
if absolute {
self.consume_peeked();
}
let mut parts = vec![self.path_part()?];
while let Ok(TokenKind::ColonColon) = self.peek_kind(PARSING) {
while let Ok(TokenKind::Op(Op::ColonColon)) = self.peek_kind(PARSING) {
self.consume_peeked();
parts.push(self.path_part()?);
}
@ -225,7 +230,7 @@ impl<'t> Parser<'t> {
Ok(Stmt {
kind: self.stmtkind()?,
semi: match self.peek_kind(PARSING) {
Ok(TokenKind::Semi) => {
Ok(TokenKind::Op(Op::Semi)) => {
self.consume_peeked();
Semi::Terminated
}
@ -247,11 +252,16 @@ impl<'t> Parser<'t> {
impl<'t> Parser<'t> {
/// Parses an [attribute set](Attrs)
pub fn attributes(&mut self) -> PResult<Attrs> {
if self.match_type(TokenKind::Hash, Parsing::Attrs).is_err() {
if self.match_op(Op::Hash, Parsing::Attrs).is_err() {
return Ok(Attrs { meta: vec![] });
}
let meta = delim(
sep(Self::meta, TokenKind::Comma, BRACKETS.1, Parsing::Attrs),
sep(
Self::meta,
TokenKind::Op(Op::Comma),
BRACKETS.1,
Parsing::Attrs,
),
BRACKETS,
Parsing::Attrs,
);
@ -263,16 +273,16 @@ impl<'t> Parser<'t> {
pub fn meta_kind(&mut self) -> PResult<MetaKind> {
const PARSING: Parsing = Parsing::Meta;
let lit_tuple = delim(
sep(Self::literal, TokenKind::Comma, PARENS.1, PARSING),
sep(Self::literal, TokenKind::Op(Op::Comma), PARENS.1, PARSING),
PARENS,
PARSING,
);
Ok(match self.peek_kind(PARSING) {
Ok(TokenKind::Eq) => {
Ok(TokenKind::Op(Op::Eq)) => {
self.consume_peeked();
MetaKind::Equals(self.literal()?)
}
Ok(TokenKind::LParen) => MetaKind::Func(lit_tuple(self)?),
Ok(TokenKind::Op(Op::LParen)) => MetaKind::Func(lit_tuple(self)?),
_ => MetaKind::Plain,
})
}
@ -302,13 +312,13 @@ impl<'t> Parser<'t> {
self.match_type(TokenKind::Type, PARSING)?;
let out = Ok(Alias {
to: self.identifier()?,
from: if self.match_type(TokenKind::Eq, PARSING).is_ok() {
from: if self.match_op(Op::Eq, PARSING).is_ok() {
Some(self.ty()?.into())
} else {
None
},
});
self.match_type(TokenKind::Semi, PARSING)?;
self.match_op(Op::Semi, PARSING)?;
out
}
@ -318,15 +328,15 @@ impl<'t> Parser<'t> {
let out = Ok(Const {
name: self.identifier()?,
ty: {
self.match_type(TokenKind::Colon, PARSING)?;
self.match_op(Op::Colon, PARSING)?;
self.ty()?.into()
},
init: {
self.match_type(TokenKind::Eq, PARSING)?;
self.match_op(Op::Eq, PARSING)?;
self.expr()?.into()
},
});
self.match_type(TokenKind::Semi, PARSING)?;
self.match_op(Op::Semi, PARSING)?;
out
}
pub fn parse_static(&mut self) -> PResult<Static> {
@ -336,15 +346,15 @@ impl<'t> Parser<'t> {
mutable: self.mutability()?,
name: self.identifier()?,
ty: {
self.match_type(TokenKind::Colon, PARSING)?;
self.match_op(Op::Colon, PARSING)?;
self.ty()?.into()
},
init: {
self.match_type(TokenKind::Eq, PARSING)?;
self.match_op(Op::Eq, PARSING)?;
self.expr()?.into()
},
});
self.match_type(TokenKind::Semi, PARSING)?;
self.match_op(Op::Semi, PARSING)?;
out
}
pub fn parse_module(&mut self) -> PResult<Module> {
@ -357,12 +367,12 @@ impl<'t> Parser<'t> {
let inline = delim(Self::file, CURLIES, PARSING);
match self.peek_kind(PARSING)? {
TokenKind::LCurly => Ok(ModuleKind::Inline(inline(self)?)),
TokenKind::Semi => {
TokenKind::Op(Op::LCurly) => Ok(ModuleKind::Inline(inline(self)?)),
TokenKind::Op(Op::Semi) => {
self.consume_peeked();
Ok(ModuleKind::Outline)
}
got => Err(self.error(Expected { want: TokenKind::Semi, got }, PARSING)),
got => Err(self.error(Expected { want: TokenKind::Op(Op::Semi), got }, PARSING)),
}
}
pub fn parse_function(&mut self) -> PResult<Function> {
@ -372,16 +382,16 @@ impl<'t> Parser<'t> {
name: self.identifier()?,
args: self.parse_params()?,
rety: match self.peek_kind(PARSING)? {
TokenKind::LCurly | TokenKind::Semi => None,
TokenKind::Arrow => {
TokenKind::Op(Op::LCurly) | TokenKind::Op(Op::Semi) => None,
TokenKind::Op(Op::Arrow) => {
self.consume_peeked();
Some(self.ty()?.into())
}
got => Err(self.error(Expected { want: TokenKind::Arrow, got }, PARSING))?,
got => Err(self.error(Expected { want: TokenKind::Op(Op::Arrow), got }, PARSING))?,
},
body: match self.peek_kind(PARSING)? {
TokenKind::LCurly => Some(self.block()?),
TokenKind::Semi => {
TokenKind::Op(Op::LCurly) => Some(self.block()?),
TokenKind::Op(Op::Semi) => {
self.consume_peeked();
None
}
@ -392,7 +402,12 @@ impl<'t> Parser<'t> {
pub fn parse_params(&mut self) -> PResult<Vec<Param>> {
const PARSING: Parsing = Parsing::Function;
delim(
sep(Self::parse_param, TokenKind::Comma, PARENS.1, PARSING),
sep(
Self::parse_param,
TokenKind::Op(Op::Comma),
PARENS.1,
PARSING,
),
PARENS,
PARSING,
)(self)
@ -402,7 +417,7 @@ impl<'t> Parser<'t> {
mutability: self.mutability()?,
name: self.identifier()?,
ty: {
self.match_type(TokenKind::Colon, Parsing::Param)?;
self.match_op(Op::Colon, Parsing::Param)?;
self.ty()?.into()
},
})
@ -413,13 +428,13 @@ impl<'t> Parser<'t> {
Ok(Struct {
name: self.identifier()?,
kind: match self.peek_kind(PARSING)? {
TokenKind::LParen => self.structkind_tuple()?,
TokenKind::LCurly => self.structkind_struct()?,
TokenKind::Semi => {
TokenKind::Op(Op::LParen) => self.structkind_tuple()?,
TokenKind::Op(Op::LCurly) => self.structkind_struct()?,
TokenKind::Op(Op::Semi) => {
self.consume_peeked();
StructKind::Empty
}
got => Err(self.error(Expected { want: TokenKind::Semi, got }, PARSING))?,
got => Err(self.error(Expected { want: TokenKind::Op(Op::Semi), got }, PARSING))?,
},
})
}
@ -427,7 +442,7 @@ impl<'t> Parser<'t> {
const PARSING: Parsing = Parsing::StructKind;
Ok(StructKind::Tuple(delim(
sep(Self::ty, TokenKind::Comma, PARENS.1, PARSING),
sep(Self::ty, TokenKind::Op(Op::Comma), PARENS.1, PARSING),
PARENS,
PARSING,
)(self)?))
@ -435,7 +450,12 @@ impl<'t> Parser<'t> {
pub fn structkind_struct(&mut self) -> PResult<StructKind> {
const PARSING: Parsing = Parsing::StructKind;
Ok(StructKind::Struct(delim(
sep(Self::struct_member, TokenKind::Comma, CURLIES.1, PARSING),
sep(
Self::struct_member,
TokenKind::Op(Op::Comma),
CURLIES.1,
PARSING,
),
CURLIES,
PARSING,
)(self)?))
@ -446,7 +466,7 @@ impl<'t> Parser<'t> {
vis: self.visibility()?,
name: self.identifier()?,
ty: {
self.match_type(TokenKind::Colon, PARSING)?;
self.match_op(Op::Colon, PARSING)?;
self.ty()?
},
})
@ -458,17 +478,17 @@ impl<'t> Parser<'t> {
Ok(Enum {
name: self.identifier()?,
kind: match self.peek_kind(PARSING)? {
TokenKind::LCurly => EnumKind::Variants(delim(
TokenKind::Op(Op::LCurly) => EnumKind::Variants(delim(
sep(
Self::enum_variant,
TokenKind::Comma,
TokenKind::RCurly,
TokenKind::Op(Op::Comma),
TokenKind::Op(Op::RCurly),
PARSING,
),
CURLIES,
PARSING,
)(self)?),
TokenKind::Semi => {
TokenKind::Op(Op::Semi) => {
self.consume_peeked();
EnumKind::NoVariants
}
@ -482,16 +502,16 @@ impl<'t> Parser<'t> {
Ok(Variant {
name: self.identifier()?,
kind: match self.peek_kind(PARSING)? {
TokenKind::Eq => self.variantkind_clike()?,
TokenKind::LCurly => self.variantkind_struct()?,
TokenKind::LParen => self.variantkind_tuple()?,
TokenKind::Op(Op::Eq) => self.variantkind_clike()?,
TokenKind::Op(Op::LCurly) => self.variantkind_struct()?,
TokenKind::Op(Op::LParen) => self.variantkind_tuple()?,
_ => VariantKind::Plain,
},
})
}
pub fn variantkind_clike(&mut self) -> PResult<VariantKind> {
const PARSING: Parsing = Parsing::VariantKind;
self.match_type(TokenKind::Eq, PARSING)?;
self.match_op(Op::Eq, PARSING)?;
let tok = self.match_type(TokenKind::Integer, PARSING)?;
Ok(VariantKind::CLike(match tok.data() {
TokenData::Integer(i) => *i,
@ -503,8 +523,8 @@ impl<'t> Parser<'t> {
Ok(VariantKind::Struct(delim(
sep(
Self::struct_member,
TokenKind::Comma,
TokenKind::RCurly,
TokenKind::Op(Op::Comma),
TokenKind::Op(Op::RCurly),
PARSING,
),
CURLIES,
@ -514,7 +534,12 @@ impl<'t> Parser<'t> {
pub fn variantkind_tuple(&mut self) -> PResult<VariantKind> {
const PARSING: Parsing = Parsing::VariantKind;
Ok(VariantKind::Tuple(delim(
sep(Self::ty, TokenKind::Comma, TokenKind::RParen, PARSING),
sep(
Self::ty,
TokenKind::Op(Op::Comma),
TokenKind::Op(Op::RParen),
PARSING,
),
PARENS,
PARSING,
)(self)?))
@ -550,7 +575,7 @@ impl<'t> Parser<'t> {
pub fn tykind(&mut self) -> PResult<TyKind> {
const PARSING: Parsing = Parsing::TyKind;
let out = match self.peek_kind(PARSING)? {
TokenKind::Bang => {
TokenKind::Op(Op::Bang) => {
self.consume_peeked();
TyKind::Never
}
@ -558,8 +583,8 @@ impl<'t> Parser<'t> {
self.consume_peeked();
TyKind::SelfTy
}
TokenKind::Amp | TokenKind::AmpAmp => self.tyref()?.into(),
TokenKind::LParen => self.tytuple()?.into(),
TokenKind::Op(Op::Amp) | TokenKind::Op(Op::AmpAmp) => self.tyref()?.into(),
TokenKind::Op(Op::LParen) => self.tytuple()?.into(),
TokenKind::Fn => self.tyfn()?.into(),
path_like!() => self.path()?.into(),
t => Err(self.error(Unexpected(t), PARSING))?,
@ -572,7 +597,7 @@ impl<'t> Parser<'t> {
const PARSING: Parsing = Parsing::TyTuple;
Ok(TyTuple {
types: delim(
sep(Self::ty, TokenKind::Comma, PARENS.1, PARSING),
sep(Self::ty, TokenKind::Op(Op::Comma), PARENS.1, PARSING),
PARENS,
PARSING,
)(self)?,
@ -584,8 +609,8 @@ impl<'t> Parser<'t> {
let mut count = 0;
loop {
match self.peek_kind(PARSING)? {
TokenKind::Amp => count += 1,
TokenKind::AmpAmp => count += 2,
TokenKind::Op(Op::Amp) => count += 1,
TokenKind::Op(Op::AmpAmp) => count += 2,
_ => break,
}
self.consume_peeked();
@ -600,7 +625,7 @@ impl<'t> Parser<'t> {
args: self.tytuple()?,
rety: {
match self.peek_kind(PARSING)? {
TokenKind::Arrow => {
TokenKind::Op(Op::Arrow) => {
self.consume_peeked();
Some(self.ty()?.into())
}
@ -613,11 +638,16 @@ impl<'t> Parser<'t> {
/// Expands to a pattern which matches literal-like [TokenKind]s
macro literal_like() {
TokenKind::True | TokenKind::False | TokenKind::String | TokenKind::Character | TokenKind::Integer | TokenKind::Float
TokenKind::True
| TokenKind::False
| TokenKind::String
| TokenKind::Character
| TokenKind::Integer
| TokenKind::Float
}
/// Expands to a pattern which matches path-like [token Types](Type)
macro path_like() {
TokenKind::Super | TokenKind::SelfKw | TokenKind::Identifier | TokenKind::ColonColon
TokenKind::Super | TokenKind::SelfKw | TokenKind::Identifier | TokenKind::Op(Op::ColonColon)
}
/// # Path parsing
impl<'t> Parser<'t> {
@ -650,7 +680,7 @@ impl<'t> Parser<'t> {
/// See also: [Parser::stmt]
pub fn stmtkind(&mut self) -> PResult<StmtKind> {
Ok(match self.peek_kind(Parsing::StmtKind)? {
TokenKind::Semi => StmtKind::Empty,
TokenKind::Op(Op::Semi) => StmtKind::Empty,
TokenKind::Let => self.parse_let()?.into(),
item_like!() => self.item()?.into(),
_ => self.expr()?.into(),
@ -662,13 +692,13 @@ impl<'t> Parser<'t> {
Ok(Let {
mutable: self.mutability()?,
name: self.identifier()?,
ty: if Ok(TokenKind::Colon) == self.peek_kind(Parsing::Let) {
ty: if Ok(TokenKind::Op(Op::Colon)) == self.peek_kind(Parsing::Let) {
self.consume_peeked();
Some(self.ty()?.into())
} else {
None
},
init: if Ok(TokenKind::Eq) == self.peek_kind(Parsing::Let) {
init: if Ok(TokenKind::Op(Op::Eq)) == self.peek_kind(Parsing::Let) {
self.consume_peeked();
Some(self.expr()?.into())
} else {
@ -782,10 +812,10 @@ impl<'t> Parser<'t> {
const PARSING: Parsing = Parsing::Call;
let callee = self.expr_from(Self::exprkind_index)?;
let mut args = vec![];
while Ok(TokenKind::LParen) == self.peek_kind(PARSING) {
while Ok(TokenKind::Op(Op::LParen)) == self.peek_kind(PARSING) {
self.consume_peeked();
args.push(self.tuple()?);
self.match_type(TokenKind::RParen, PARSING)?;
self.match_op(Op::RParen, PARSING)?;
}
if args.is_empty() {
Ok(callee.kind)
@ -797,12 +827,12 @@ impl<'t> Parser<'t> {
pub fn exprkind_index(&mut self) -> PResult<ExprKind> {
const PARSING: Parsing = Parsing::Index;
let head = self.expr_from(Self::exprkind_primary)?;
if Ok(TokenKind::LBrack) != self.peek_kind(PARSING) {
if Ok(TokenKind::Op(Op::LBrack)) != self.peek_kind(PARSING) {
return Ok(head.kind);
}
let mut indices = vec![];
while Ok(TokenKind::LBrack) == self.peek_kind(PARSING) {
while Ok(TokenKind::Op(Op::LBrack)) == self.peek_kind(PARSING) {
indices.push(delim(Self::tuple, BRACKETS, PARSING)(self)?.into());
}
Ok(Index { head: head.into(), indices }.into())
@ -810,10 +840,10 @@ impl<'t> Parser<'t> {
/// Delegates to the set of highest-priority rules based on unambiguous pattern matching
pub fn exprkind_primary(&mut self) -> PResult<ExprKind> {
match self.peek_kind(Parsing::Expr)? {
TokenKind::Amp | TokenKind::AmpAmp => self.exprkind_addrof(),
TokenKind::LCurly => self.exprkind_block(),
TokenKind::LBrack => self.exprkind_array(),
TokenKind::LParen => self.exprkind_empty_group_or_tuple(),
TokenKind::Op(Op::Amp) | TokenKind::Op(Op::AmpAmp) => self.exprkind_addrof(),
TokenKind::Op(Op::LCurly) => self.exprkind_block(),
TokenKind::Op(Op::LBrack) => self.exprkind_array(),
TokenKind::Op(Op::LParen) => self.exprkind_empty_group_or_tuple(),
literal_like!() => Ok(self.literal()?.into()),
path_like!() => Ok(self.path()?.into()),
TokenKind::If => Ok(self.parse_if()?.into()),
@ -831,8 +861,8 @@ impl<'t> Parser<'t> {
/// so they can't be independent subexpressions
pub fn exprkind_array(&mut self) -> PResult<ExprKind> {
const PARSING: Parsing = Parsing::Array;
const START: TokenKind = TokenKind::LBrack;
const END: TokenKind = TokenKind::RBrack;
const START: TokenKind = TokenKind::Op(Op::LBrack);
const END: TokenKind = TokenKind::Op(Op::RBrack);
self.match_type(START, PARSING)?;
match self.peek_kind(PARSING)? {
END => {
@ -845,10 +875,10 @@ impl<'t> Parser<'t> {
/// [ArrayRep] = `[` [Expr] `;` [Expr] `]`
pub fn exprkind_array_rep(&mut self) -> PResult<ExprKind> {
const PARSING: Parsing = Parsing::Array;
const END: TokenKind = TokenKind::RBrack;
const END: TokenKind = TokenKind::Op(Op::RBrack);
let first = self.expr()?;
let out: ExprKind = match self.peek_kind(PARSING)? {
TokenKind::Semi => ArrayRep {
TokenKind::Op(Op::Semi) => ArrayRep {
value: first.into(),
repeat: {
self.consume_peeked();
@ -856,12 +886,14 @@ impl<'t> Parser<'t> {
},
}
.into(),
TokenKind::RBrack => Array { values: vec![first] }.into(),
TokenKind::Comma => Array {
TokenKind::Op(Op::RBrack) => Array { values: vec![first] }.into(),
TokenKind::Op(Op::Comma) => Array {
values: {
self.consume_peeked();
let mut out = vec![first];
out.extend(sep(Self::expr, TokenKind::Comma, END, PARSING)(self)?);
out.extend(sep(Self::expr, TokenKind::Op(Op::Comma), END, PARSING)(
self,
)?);
out
},
}
@ -878,8 +910,8 @@ impl<'t> Parser<'t> {
let mut count = 0;
loop {
match self.peek_kind(PARSING)? {
TokenKind::Amp => count += 1,
TokenKind::AmpAmp => count += 2,
TokenKind::Op(Op::Amp) => count += 1,
TokenKind::Op(Op::AmpAmp) => count += 2,
_ => break,
}
self.consume_peeked();
@ -894,13 +926,13 @@ impl<'t> Parser<'t> {
///
/// [ExprKind::Empty] and [Group] are special cases of [Tuple]
pub fn exprkind_empty_group_or_tuple(&mut self) -> PResult<ExprKind> {
self.match_type(TokenKind::LParen, Parsing::Group)?;
self.match_op(Op::LParen, Parsing::Group)?;
let out = match self.peek_kind(Parsing::Group)? {
TokenKind::RParen => Ok(ExprKind::Empty),
TokenKind::Op(Op::RParen) => Ok(ExprKind::Empty),
_ => self.exprkind_group(),
};
match self.peek_kind(Parsing::Group) {
Ok(TokenKind::RParen) => self.consume_peeked(),
Ok(TokenKind::Op(Op::RParen)) => self.consume_peeked(),
_ => Err(self.error(UnmatchedParentheses, Parsing::Group))?,
};
out
@ -909,13 +941,13 @@ impl<'t> Parser<'t> {
pub fn exprkind_group(&mut self) -> PResult<ExprKind> {
let first = self.expr()?;
match self.peek_kind(Parsing::Group)? {
TokenKind::Comma => {
TokenKind::Op(Op::Comma) => {
let mut exprs = vec![first];
self.consume_peeked();
while TokenKind::RParen != self.peek_kind(Parsing::Tuple)? {
while TokenKind::Op(Op::RParen) != self.peek_kind(Parsing::Tuple)? {
exprs.push(self.expr()?);
match self.peek_kind(Parsing::Tuple)? {
TokenKind::Comma => self.consume_peeked(),
TokenKind::Op(Op::Comma) => self.consume_peeked(),
_ => break,
};
}
@ -957,7 +989,7 @@ impl<'t> Parser<'t> {
} {
exprs.push(expr);
match self.peek_kind(Parsing::Tuple)? {
TokenKind::Comma => self.consume_peeked(),
TokenKind::Op(Op::Comma) => self.consume_peeked(),
_ => break,
};
}
@ -1034,7 +1066,7 @@ macro operator($($name:ident ($returns:ident) {$($t:ident => $p:ident),*$(,)?};)
pub fn $name (&mut self) -> PResult<$returns> {
const PARSING: Parsing = Parsing::$returns;
let out = Ok(match self.peek_kind(PARSING) {
$(Ok(TokenKind::$t) => $returns::$p,)*
$(Ok(TokenKind::Op(Op::$t)) => $returns::$p,)*
Err(e) => Err(e)?,
Ok(t) => Err(self.error(Unexpected(t), PARSING))?,
});
@ -1105,7 +1137,7 @@ impl<'t> Parser<'t> {
pub fn member_op(&mut self) -> PResult<()> {
const PARSING: Parsing = Parsing::Member;
match self.peek(PARSING)?.ty() {
TokenKind::Dot => {}
TokenKind::Op(Op::Dot) => {}
t => Err(self.error(Unexpected(t), PARSING))?,
}
self.consume_peeked();

122
cl-token/src/token_type.rs
View File

@ -42,6 +42,12 @@ pub enum TokenKind {
String,
Character,
// Delimiters and punctuation
Op(Op),
}
/// An operator character (delimiter, punctuation)
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub enum Op {
LCurly, // {
RCurly, // }
LBrack, // [
@ -136,60 +142,7 @@ impl Display for TokenKind {
TokenKind::String => "string literal".fmt(f),
TokenKind::Character => "char literal".fmt(f),
TokenKind::LCurly => "left curly".fmt(f),
TokenKind::RCurly => "right curly".fmt(f),
TokenKind::LBrack => "left brack".fmt(f),
TokenKind::RBrack => "right brack".fmt(f),
TokenKind::LParen => "left paren".fmt(f),
TokenKind::RParen => "right paren".fmt(f),
TokenKind::Amp => "and".fmt(f),
TokenKind::AmpAmp => "and-and".fmt(f),
TokenKind::AmpEq => "and-assign".fmt(f),
TokenKind::Arrow => "arrow".fmt(f),
TokenKind::At => "at".fmt(f),
TokenKind::Backslash => "backslash".fmt(f),
TokenKind::Bang => "bang".fmt(f),
TokenKind::BangBang => "not-not".fmt(f),
TokenKind::BangEq => "not equal to".fmt(f),
TokenKind::Bar => "or".fmt(f),
TokenKind::BarBar => "or-or".fmt(f),
TokenKind::BarEq => "or-assign".fmt(f),
TokenKind::Colon => "colon".fmt(f),
TokenKind::ColonColon => "path separator".fmt(f),
TokenKind::Comma => "comma".fmt(f),
TokenKind::Dot => "dot".fmt(f),
TokenKind::DotDot => "exclusive range".fmt(f),
TokenKind::DotDotEq => "inclusive range".fmt(f),
TokenKind::Eq => "assign".fmt(f),
TokenKind::EqEq => "equal to".fmt(f),
TokenKind::FatArrow => "fat arrow".fmt(f),
TokenKind::Grave => "grave".fmt(f),
TokenKind::Gt => "greater than".fmt(f),
TokenKind::GtEq => "greater than or equal to".fmt(f),
TokenKind::GtGt => "shift right".fmt(f),
TokenKind::GtGtEq => "shift right-assign".fmt(f),
TokenKind::Hash => "hash".fmt(f),
TokenKind::HashBang => "shebang".fmt(f),
TokenKind::Lt => "less than".fmt(f),
TokenKind::LtEq => "less than or equal to".fmt(f),
TokenKind::LtLt => "shift left".fmt(f),
TokenKind::LtLtEq => "shift left-assign".fmt(f),
TokenKind::Minus => "sub".fmt(f),
TokenKind::MinusEq => "sub-assign".fmt(f),
TokenKind::Plus => "add".fmt(f),
TokenKind::PlusEq => "add-assign".fmt(f),
TokenKind::Question => "huh?".fmt(f),
TokenKind::Rem => "rem".fmt(f),
TokenKind::RemEq => "rem-assign".fmt(f),
TokenKind::Semi => "ignore".fmt(f),
TokenKind::Slash => "div".fmt(f),
TokenKind::SlashEq => "div-assign".fmt(f),
TokenKind::Star => "star".fmt(f),
TokenKind::StarEq => "star-assign".fmt(f),
TokenKind::Tilde => "tilde".fmt(f),
TokenKind::Xor => "xor".fmt(f),
TokenKind::XorEq => "xor-assign".fmt(f),
TokenKind::XorXor => "cat-ears".fmt(f),
TokenKind::Op(op) => op.fmt(f),
}
}
}
@ -228,3 +181,64 @@ impl FromStr for TokenKind {
})
}
}
impl Display for Op {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Op::LCurly => "left curly".fmt(f),
Op::RCurly => "right curly".fmt(f),
Op::LBrack => "left brack".fmt(f),
Op::RBrack => "right brack".fmt(f),
Op::LParen => "left paren".fmt(f),
Op::RParen => "right paren".fmt(f),
Op::Amp => "and".fmt(f),
Op::AmpAmp => "and-and".fmt(f),
Op::AmpEq => "and-assign".fmt(f),
Op::Arrow => "arrow".fmt(f),
Op::At => "at".fmt(f),
Op::Backslash => "backslash".fmt(f),
Op::Bang => "bang".fmt(f),
Op::BangBang => "not-not".fmt(f),
Op::BangEq => "not equal to".fmt(f),
Op::Bar => "or".fmt(f),
Op::BarBar => "or-or".fmt(f),
Op::BarEq => "or-assign".fmt(f),
Op::Colon => "colon".fmt(f),
Op::ColonColon => "path separator".fmt(f),
Op::Comma => "comma".fmt(f),
Op::Dot => "dot".fmt(f),
Op::DotDot => "exclusive range".fmt(f),
Op::DotDotEq => "inclusive range".fmt(f),
Op::Eq => "assign".fmt(f),
Op::EqEq => "equal to".fmt(f),
Op::FatArrow => "fat arrow".fmt(f),
Op::Grave => "grave".fmt(f),
Op::Gt => "greater than".fmt(f),
Op::GtEq => "greater than or equal to".fmt(f),
Op::GtGt => "shift right".fmt(f),
Op::GtGtEq => "shift right-assign".fmt(f),
Op::Hash => "hash".fmt(f),
Op::HashBang => "shebang".fmt(f),
Op::Lt => "less than".fmt(f),
Op::LtEq => "less than or equal to".fmt(f),
Op::LtLt => "shift left".fmt(f),
Op::LtLtEq => "shift left-assign".fmt(f),
Op::Minus => "sub".fmt(f),
Op::MinusEq => "sub-assign".fmt(f),
Op::Plus => "add".fmt(f),
Op::PlusEq => "add-assign".fmt(f),
Op::Question => "huh?".fmt(f),
Op::Rem => "rem".fmt(f),
Op::RemEq => "rem-assign".fmt(f),
Op::Semi => "ignore".fmt(f),
Op::Slash => "div".fmt(f),
Op::SlashEq => "div-assign".fmt(f),
Op::Star => "star".fmt(f),
Op::StarEq => "star-assign".fmt(f),
Op::Tilde => "tilde".fmt(f),
Op::Xor => "xor".fmt(f),
Op::XorEq => "xor-assign".fmt(f),
Op::XorXor => "cat-ears".fmt(f),
}
}
}