2024-06-25 12:55:25 -05:00
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use std::simd::cmp::SimdPartialEq;
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2024-05-19 11:20:42 -05:00
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2024-06-25 11:39:59 -05:00
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const fn ascii_mask(chars: &[u8]) -> u128 {
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let mut eq = 0;
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let mut i = 0;
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while i < chars.len() {
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let b = chars[i];
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eq |= 1 << b;
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i += 1;
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}
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eq
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}
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2024-05-11 09:04:13 -05:00
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#[derive(Debug, PartialEq, Eq, Clone, Copy)]
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pub struct Token {
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pub kind: TokenKind,
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pub start: u32,
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pub end: u32,
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}
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impl Token {
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pub fn range(&self) -> std::ops::Range<usize> {
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self.start as usize..self.end as usize
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}
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}
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2024-05-11 15:22:08 -05:00
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macro_rules! gen_token_kind {
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($(
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#[$atts:meta])*
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$vis:vis enum $name:ident {
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#[patterns] $(
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$pattern:ident,
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)*
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#[keywords] $(
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$keyword:ident = $keyword_lit:literal,
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)*
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#[punkt] $(
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$punkt:ident = $punkt_lit:literal,
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)*
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#[ops] $(
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#[$prec:ident] $(
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$op:ident = $op_lit:literal $(=> $assign:ident)?,
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)*
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)*
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}
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) => {
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impl std::fmt::Display for $name {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
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let sf = *self as u8;
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f.write_str(match *self {
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$( Self::$pattern => concat!('<', stringify!($pattern), '>'), )*
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$( Self::$keyword => stringify!($keyword_lit), )*
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$( Self::$punkt => stringify!($punkt_lit), )*
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$($( Self::$op => $op_lit,
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$(Self::$assign => concat!($op_lit, "="),)?)*)*
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_ => unsafe { std::str::from_utf8_unchecked(std::slice::from_ref(&sf)) },
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})
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}
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}
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impl $name {
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#[inline(always)]
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pub fn precedence(&self) -> Option<u8> {
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Some(match self {
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$($(Self::$op => ${ignore($prec)} ${index(1)},
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$(Self::$assign => 0,)?)*)*
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_ => return None,
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} + 1)
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}
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#[inline(always)]
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fn from_ident(ident: &[u8]) -> Self {
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match ident {
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$($keyword_lit => Self::$keyword,)*
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_ => Self::Ident,
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}
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}
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}
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};
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}
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#[derive(Debug, PartialEq, Eq, Clone, Copy)]
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#[repr(u8)]
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pub enum TokenKind {
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Not = b'!',
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DQuote = b'"',
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Pound = b'#',
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CtIdent = b'$',
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Mod = b'%',
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Band = b'&',
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Quote = b'\'',
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LParen = b'(',
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RParen = b')',
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Mul = b'*',
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Add = b'+',
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Comma = b',',
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Sub = b'-',
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Dot = b'.',
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Div = b'/',
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// Unused = 2-6
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Shl = b'<' - 5,
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// Unused = 8
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Shr = b'>' - 5,
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Colon = b':',
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Semi = b';',
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Lt = b'<',
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Assign = b'=',
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Gt = b'>',
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Que = b'?',
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Directive = b'@',
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2024-06-25 12:46:48 -05:00
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Comment,
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Ident,
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Number,
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Eof,
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2024-07-19 05:00:55 -05:00
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Ct,
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Return,
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If,
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Else,
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Loop,
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Break,
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Continue,
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Fn,
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Struct,
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True,
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Ctor,
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Tupl,
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Or,
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And,
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// Unused = R-Z
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LBrack = b'[',
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BSlash = b'\\',
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RBrack = b']',
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Xor = b'^',
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Tick = b'`',
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// Unused = a-z
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LBrace = b'{',
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Bor = b'|',
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RBrace = b'}',
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Tilde = b'~',
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Decl = b':' + 128,
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Eq = b'=' + 128,
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Ne = b'!' + 128,
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Le = b'<' + 128,
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Ge = b'>' + 128,
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BorAss = b'|' + 128,
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AddAss = b'+' + 128,
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SubAss = b'-' + 128,
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MulAss = b'*' + 128,
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DivAss = b'/' + 128,
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ModAss = b'%' + 128,
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XorAss = b'^' + 128,
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BandAss = b'&' + 128,
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ShrAss = b'>' - 5 + 128,
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ShlAss = b'<' - 5 + 128,
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}
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impl TokenKind {
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pub fn ass_op(self) -> Option<Self> {
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let id = (self as u8).saturating_sub(128);
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if ascii_mask(b"|+-*/%^&79") & (1u128 << id) == 0 {
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return None;
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}
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Some(unsafe { std::mem::transmute::<u8, Self>(id) })
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}
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2024-05-10 15:54:12 -05:00
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}
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2024-05-11 15:22:08 -05:00
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gen_token_kind! {
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pub enum TokenKind {
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#[patterns]
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CtIdent,
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Ident,
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Number,
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Eof,
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Directive,
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#[keywords]
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Return = b"return",
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If = b"if",
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Else = b"else",
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Loop = b"loop",
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Break = b"break",
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Continue = b"continue",
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Fn = b"fn",
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Struct = b"struct",
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True = b"true",
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#[punkt]
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Ctor = ".{",
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Tupl = ".(",
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#[ops]
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#[prec]
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Decl = ":=",
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Assign = "=",
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#[prec]
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Or = "||",
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#[prec]
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And = "&&",
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#[prec]
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Bor = "|" => BorAss,
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#[prec]
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Xor = "^" => XorAss,
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#[prec]
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Band = "&" => BandAss,
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#[prec]
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Eq = "==",
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Ne = "!=",
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#[prec]
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Le = "<=",
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2024-05-13 06:36:29 -05:00
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Ge = ">=",
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Lt = "<",
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Gt = ">",
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#[prec]
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Shl = "<<" => ShlAss,
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Shr = ">>" => ShrAss,
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#[prec]
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Add = "+" => AddAss,
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Sub = "-" => SubAss,
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#[prec]
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Mul = "*" => MulAss,
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Div = "/" => DivAss,
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Mod = "%" => ModAss,
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2024-05-10 15:54:12 -05:00
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}
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}
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2024-05-09 16:41:59 -05:00
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pub struct Lexer<'a> {
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pos: u32,
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bytes: &'a [u8],
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}
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impl<'a> Lexer<'a> {
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pub fn new(input: &'a str) -> Self {
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Self::restore(input, 0)
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}
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pub fn restore(input: &'a str, pos: u32) -> Self {
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Self { pos, bytes: input.as_bytes() }
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}
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2024-05-12 04:52:58 -05:00
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pub fn slice(&self, tok: std::ops::Range<usize>) -> &'a str {
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unsafe { std::str::from_utf8_unchecked(&self.bytes[tok]) }
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}
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fn peek(&self) -> Option<u8> {
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if std::intrinsics::unlikely(self.pos >= self.bytes.len() as u32) {
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None
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} else {
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Some(unsafe { *self.bytes.get_unchecked(self.pos as usize) })
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}
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}
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fn advance(&mut self) -> Option<u8> {
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let c = self.peek()?;
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self.pos += 1;
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Some(c)
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}
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2024-07-19 14:04:22 -05:00
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pub fn last(&mut self) -> Token {
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let mut token = self.next();
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loop {
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let next = self.next();
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if next.kind == TokenKind::Eof {
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break;
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}
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token = next;
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}
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token
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}
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2024-05-09 16:41:59 -05:00
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pub fn next(&mut self) -> Token {
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use TokenKind as T;
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loop {
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let mut start = self.pos;
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let Some(c) = self.advance() else {
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return Token { kind: T::Eof, start, end: self.pos };
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};
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2024-06-01 13:30:07 -05:00
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let advance_ident = |s: &mut Self| {
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2024-06-25 11:39:59 -05:00
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while let Some(b'a'..=b'z' | b'A'..=b'Z' | b'0'..=b'9' | b'_' | 127..) = s.peek() {
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s.advance();
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}
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};
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2024-06-25 12:12:35 -05:00
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let identity = |s: u8| unsafe { std::mem::transmute::<u8, T>(s) };
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let kind = match c {
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..=b' ' => continue,
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b'0' if self.advance_if(b'x') => {
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2024-09-01 14:07:19 -05:00
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while let Some(b'0'..=b'9' | b'A'..=b'F' | b'a'..=b'f') = self.peek() {
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2024-09-01 12:42:04 -05:00
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self.advance();
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}
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T::Number
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}
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b'0' if self.advance_if(b'b') => {
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while let Some(b'0' | b'1') = self.peek() {
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self.advance();
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}
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T::Number
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}
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2024-09-01 12:45:38 -05:00
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b'0' if self.advance_if(b'o') => {
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2024-09-01 14:07:19 -05:00
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while let Some(b'0'..=b'7') = self.peek() {
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self.advance();
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}
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T::Number
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}
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2024-05-15 03:37:39 -05:00
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b'0'..=b'9' => {
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while let Some(b'0'..=b'9') = self.peek() {
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self.advance();
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}
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T::Number
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}
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b'a'..=b'z' | b'A'..=b'Z' | b'_' | 127.. => {
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2024-06-01 13:30:07 -05:00
|
|
|
advance_ident(self);
|
|
|
|
let ident = &self.bytes[start as usize..self.pos as usize];
|
|
|
|
T::from_ident(ident)
|
2024-05-15 03:37:39 -05:00
|
|
|
}
|
2024-06-25 12:46:48 -05:00
|
|
|
b'"' | b'\'' => loop {
|
|
|
|
match self.advance() {
|
|
|
|
Some(b'\\') => _ = self.advance(),
|
|
|
|
Some(nc) if nc == c => break identity(c),
|
|
|
|
Some(_) => {}
|
|
|
|
None => break T::Eof,
|
|
|
|
}
|
|
|
|
},
|
|
|
|
b'/' if self.advance_if(b'/') => {
|
|
|
|
while let Some(l) = self.advance()
|
|
|
|
&& l != b'\n'
|
|
|
|
{}
|
|
|
|
T::Comment
|
|
|
|
}
|
|
|
|
b'/' if self.advance_if(b'*') => {
|
|
|
|
let mut depth = 1;
|
|
|
|
while let Some(l) = self.advance() {
|
|
|
|
match l {
|
|
|
|
b'/' if self.advance_if(b'*') => depth += 1,
|
|
|
|
b'*' if self.advance_if(b'/') => match depth {
|
|
|
|
1 => break,
|
|
|
|
_ => depth -= 1,
|
|
|
|
},
|
2024-05-17 12:53:59 -05:00
|
|
|
_ => {}
|
|
|
|
}
|
|
|
|
}
|
2024-06-25 12:46:48 -05:00
|
|
|
T::Comment
|
2024-05-17 12:53:59 -05:00
|
|
|
}
|
2024-05-15 03:37:39 -05:00
|
|
|
b'.' if self.advance_if(b'{') => T::Ctor,
|
|
|
|
b'.' if self.advance_if(b'(') => T::Tupl,
|
2024-06-25 12:22:49 -05:00
|
|
|
b'&' if self.advance_if(b'&') => T::And,
|
|
|
|
b'|' if self.advance_if(b'|') => T::Or,
|
2024-07-19 05:00:55 -05:00
|
|
|
b'$' if self.advance_if(b':') => T::Ct,
|
2024-06-25 12:22:49 -05:00
|
|
|
b'@' | b'$' => {
|
|
|
|
start += 1;
|
|
|
|
advance_ident(self);
|
|
|
|
identity(c)
|
|
|
|
}
|
2024-06-25 12:12:35 -05:00
|
|
|
b'<' | b'>' if self.advance_if(c) => {
|
|
|
|
identity(c - 5 + 128 * self.advance_if(b'=') as u8)
|
|
|
|
}
|
|
|
|
b':' | b'=' | b'!' | b'<' | b'>' | b'|' | b'+' | b'-' | b'*' | b'/' | b'%'
|
|
|
|
| b'^' | b'&'
|
|
|
|
if self.advance_if(b'=') =>
|
|
|
|
{
|
|
|
|
identity(c + 128)
|
|
|
|
}
|
|
|
|
_ => identity(c),
|
2024-05-15 03:37:39 -05:00
|
|
|
};
|
|
|
|
|
2024-07-08 00:22:53 -05:00
|
|
|
return Token { kind, start, end: self.pos };
|
2024-05-15 03:37:39 -05:00
|
|
|
}
|
2024-05-09 16:41:59 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
fn advance_if(&mut self, arg: u8) -> bool {
|
|
|
|
if self.peek() == Some(arg) {
|
|
|
|
self.advance();
|
|
|
|
true
|
|
|
|
} else {
|
|
|
|
false
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2024-05-12 16:19:45 -05:00
|
|
|
pub fn line_col(&self, pos: u32) -> (usize, usize) {
|
|
|
|
line_col(self.bytes, pos)
|
2024-05-09 16:41:59 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2024-05-19 11:20:42 -05:00
|
|
|
pub fn line_col(bytes: &[u8], pos: u32) -> (usize, usize) {
|
|
|
|
bytes[..pos as usize]
|
2024-05-12 16:19:45 -05:00
|
|
|
.split(|&b| b == b'\n')
|
2024-05-19 11:20:42 -05:00
|
|
|
.map(<[u8]>::len)
|
2024-05-12 16:19:45 -05:00
|
|
|
.enumerate()
|
2024-05-19 11:20:42 -05:00
|
|
|
.last()
|
|
|
|
.map(|(line, col)| (line + 1, col + 1))
|
2024-05-12 16:19:45 -05:00
|
|
|
.unwrap_or((1, 1))
|
|
|
|
}
|
|
|
|
|
2024-05-19 11:20:42 -05:00
|
|
|
pub struct LineMap {
|
|
|
|
lines: Box<[u8]>,
|
|
|
|
}
|
2024-05-09 16:41:59 -05:00
|
|
|
|
2024-05-19 11:20:42 -05:00
|
|
|
impl LineMap {
|
|
|
|
pub fn line_col(&self, mut pos: u32) -> (usize, usize) {
|
|
|
|
let mut line = 1;
|
2024-05-09 16:41:59 -05:00
|
|
|
|
2024-05-19 11:20:42 -05:00
|
|
|
let mut iter = self.lines.iter().copied();
|
|
|
|
|
2024-06-24 10:26:00 -05:00
|
|
|
loop {
|
2024-05-19 11:20:42 -05:00
|
|
|
let mut acc = 0;
|
2024-06-24 10:26:00 -05:00
|
|
|
let mut idx = 0;
|
|
|
|
loop {
|
|
|
|
let len = iter.next().unwrap();
|
|
|
|
acc |= ((len & 0x7F) as u32) << (7 * idx);
|
|
|
|
idx += 1;
|
|
|
|
if len & 0x80 == 0 {
|
|
|
|
break;
|
|
|
|
}
|
2024-05-19 11:20:42 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
if pos < acc {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
pos = pos.saturating_sub(acc);
|
|
|
|
line += 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
(line, pos as usize + 1)
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn new(input: &str) -> Self {
|
|
|
|
let bytes = input.as_bytes();
|
|
|
|
let (start, simd_mid, end) = bytes.as_simd::<16>();
|
|
|
|
|
|
|
|
let query = std::simd::u8x16::splat(b'\n');
|
|
|
|
|
|
|
|
let nl_count = start.iter().map(|&b| (b == b'\n') as usize).sum::<usize>()
|
2024-07-08 00:22:53 -05:00
|
|
|
+ simd_mid.iter().map(|s| s.simd_eq(query).to_bitmask().count_ones()).sum::<u32>()
|
|
|
|
as usize
|
2024-05-19 11:20:42 -05:00
|
|
|
+ end.iter().map(|&b| (b == b'\n') as usize).sum::<usize>();
|
|
|
|
|
|
|
|
let mut lines = Vec::with_capacity(nl_count);
|
|
|
|
let mut last_nl = 0;
|
|
|
|
|
|
|
|
let handle_rem = |offset: usize, bytes: &[u8], last_nl: &mut usize, lines: &mut Vec<u8>| {
|
|
|
|
bytes
|
|
|
|
.iter()
|
|
|
|
.copied()
|
|
|
|
.enumerate()
|
|
|
|
.filter_map(|(i, b)| (b == b'\n').then_some(i + offset))
|
|
|
|
.for_each(|i| {
|
|
|
|
lines.push((i - *last_nl + 1) as u8);
|
|
|
|
*last_nl = i + 1;
|
|
|
|
});
|
|
|
|
};
|
|
|
|
|
|
|
|
handle_rem(0, start, &mut last_nl, &mut lines);
|
|
|
|
|
|
|
|
for (i, simd) in simd_mid.iter().enumerate() {
|
|
|
|
let mask = simd.simd_eq(query);
|
|
|
|
let mut mask = mask.to_bitmask();
|
|
|
|
while mask != 0 {
|
|
|
|
let idx = mask.trailing_zeros() as usize + i * 16 + start.len();
|
|
|
|
let mut len = idx - last_nl + 1;
|
|
|
|
while len >= 0x80 {
|
2024-06-24 10:26:00 -05:00
|
|
|
lines.push(0x80 | (len & 0x7F) as u8);
|
2024-05-19 11:20:42 -05:00
|
|
|
len >>= 7;
|
2024-05-09 16:41:59 -05:00
|
|
|
}
|
2024-05-19 11:20:42 -05:00
|
|
|
lines.push(len as u8);
|
|
|
|
last_nl = idx + 1;
|
|
|
|
mask &= mask - 1;
|
|
|
|
}
|
|
|
|
}
|
2024-05-09 16:41:59 -05:00
|
|
|
|
2024-05-19 11:20:42 -05:00
|
|
|
handle_rem(bytes.len() - end.len(), end, &mut last_nl, &mut lines);
|
|
|
|
|
2024-07-08 00:22:53 -05:00
|
|
|
Self { lines: Box::from(lines) }
|
2024-05-09 16:41:59 -05:00
|
|
|
}
|
|
|
|
}
|
2024-06-24 10:26:00 -05:00
|
|
|
|
|
|
|
#[cfg(test)]
|
|
|
|
mod test {
|
|
|
|
#[test]
|
|
|
|
fn test_smh() {
|
|
|
|
let example = include_str!("../README.md");
|
|
|
|
|
|
|
|
let nlines = super::LineMap::new(example);
|
|
|
|
|
|
|
|
fn slow_nline_search(str: &str, mut pos: usize) -> (usize, usize) {
|
|
|
|
(
|
|
|
|
str.lines()
|
|
|
|
.take_while(|l| match pos.checked_sub(l.len() + 1) {
|
|
|
|
Some(nl) => (pos = nl, true).1,
|
|
|
|
None => false,
|
|
|
|
})
|
|
|
|
.count()
|
|
|
|
+ 1,
|
|
|
|
pos + 1,
|
|
|
|
)
|
|
|
|
}
|
|
|
|
|
|
|
|
for i in 0..example.len() {
|
|
|
|
assert_eq!(slow_nline_search(example, i), nlines.line_col(i as _));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|