820 lines
19 KiB
Rust
820 lines
19 KiB
Rust
#![allow(clippy::new_without_default)] // annotating structs annotated with #[bitfield] doesn't work
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use crate::arena::*;
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use crate::atom_table::*;
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use crate::machine::machine_indices::*;
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use crate::parser::char_reader::*;
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use crate::types::HeapCellValueTag;
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use std::cell::{Cell, Ref, RefCell, RefMut};
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use std::fmt;
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use std::hash::{Hash, Hasher};
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use std::io::{Error as IOError, ErrorKind};
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use std::ops::{Deref, Neg};
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use std::rc::Rc;
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use std::sync::Arc;
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use std::vec::Vec;
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use crate::parser::dashu::{Integer, Rational};
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use fxhash::FxBuildHasher;
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use indexmap::IndexMap;
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use scryer_modular_bitfield::error::OutOfBounds;
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use scryer_modular_bitfield::prelude::*;
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pub type Specifier = u32;
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pub const MAX_ARITY: usize = 1023;
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pub const XFX: u32 = 0x0001;
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pub const XFY: u32 = 0x0002;
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pub const YFX: u32 = 0x0004;
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pub const XF: u32 = 0x0010;
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pub const YF: u32 = 0x0020;
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pub const FX: u32 = 0x0040;
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pub const FY: u32 = 0x0080;
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pub const DELIMITER: u32 = 0x0100;
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pub const TERM: u32 = 0x1000;
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pub const LTERM: u32 = 0x3000;
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pub const BTERM: u32 = 0x11000;
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pub const NEGATIVE_SIGN: u32 = 0x0200;
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#[macro_export]
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macro_rules! fixnum {
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($wrapper:tt, $n:expr, $arena:expr) => {
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Fixnum::build_with_checked($n)
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.map(<$wrapper>::Fixnum)
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.unwrap_or_else(|_| <$wrapper>::Integer(arena_alloc!(Integer::from($n), $arena)))
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};
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}
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macro_rules! is_term {
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($x:expr) => {
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($x as u32 & $crate::parser::ast::TERM) != 0 || is_negate!($x)
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};
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}
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macro_rules! is_lterm {
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($x:expr) => {
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($x as u32 & $crate::parser::ast::LTERM) != 0 || is_negate!($x)
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};
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}
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macro_rules! is_op {
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($x:expr) => {
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$x as u32
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& ($crate::parser::ast::XF
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| $crate::parser::ast::YF
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| $crate::parser::ast::FX
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| $crate::parser::ast::FY
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| $crate::parser::ast::XFX
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| $crate::parser::ast::XFY
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| $crate::parser::ast::YFX)
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!= 0
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};
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}
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macro_rules! is_negate {
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($x:expr) => {
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($x as u32 & $crate::parser::ast::NEGATIVE_SIGN) != 0
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};
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}
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#[macro_export]
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macro_rules! is_prefix {
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($x:expr) => {
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$x as u32 & ($crate::parser::ast::FX | $crate::parser::ast::FY) != 0
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};
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}
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#[macro_export]
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macro_rules! is_postfix {
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($x:expr) => {
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$x as u32 & ($crate::parser::ast::XF | $crate::parser::ast::YF) != 0
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};
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}
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#[macro_export]
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macro_rules! is_infix {
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($x:expr) => {
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($x as u32
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& ($crate::parser::ast::XFX | $crate::parser::ast::XFY | $crate::parser::ast::YFX))
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!= 0
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};
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}
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#[macro_export]
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macro_rules! is_xfx {
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($x:expr) => {
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($x as u32 & $crate::parser::ast::XFX) != 0
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};
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}
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#[macro_export]
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macro_rules! is_xfy {
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($x:expr) => {
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($x as u32 & $crate::parser::ast::XFY) != 0
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};
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}
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#[macro_export]
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macro_rules! is_yfx {
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($x:expr) => {
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($x as u32 & $crate::parser::ast::YFX) != 0
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};
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}
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#[macro_export]
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macro_rules! is_yf {
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($x:expr) => {
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($x as u32 & $crate::parser::ast::YF) != 0
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};
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}
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#[macro_export]
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macro_rules! is_xf {
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($x:expr) => {
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($x as u32 & $crate::parser::ast::XF) != 0
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};
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}
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#[macro_export]
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macro_rules! is_fx {
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($x:expr) => {
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($x as u32 & $crate::parser::ast::FX) != 0
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};
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}
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#[macro_export]
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macro_rules! is_fy {
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($x:expr) => {
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($x as u32 & $crate::parser::ast::FY) != 0
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};
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
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pub enum RegType {
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Perm(usize),
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Temp(usize),
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}
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impl Default for RegType {
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fn default() -> Self {
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RegType::Temp(0)
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}
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}
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impl RegType {
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pub fn reg_num(self) -> usize {
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match self {
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RegType::Perm(reg_num) | RegType::Temp(reg_num) => reg_num,
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}
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}
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pub fn is_perm(self) -> bool {
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matches!(self, RegType::Perm(_))
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}
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}
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impl fmt::Display for RegType {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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RegType::Perm(val) => write!(f, "Y{}", val),
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RegType::Temp(val) => write!(f, "X{}", val),
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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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pub enum VarReg {
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ArgAndNorm(RegType, usize),
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Norm(RegType),
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}
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impl VarReg {
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pub fn norm(self) -> RegType {
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match self {
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VarReg::ArgAndNorm(reg, _) | VarReg::Norm(reg) => reg,
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}
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}
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}
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impl fmt::Display for VarReg {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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VarReg::Norm(RegType::Perm(reg)) => write!(f, "Y{}", reg),
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VarReg::Norm(RegType::Temp(reg)) => write!(f, "X{}", reg),
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VarReg::ArgAndNorm(RegType::Perm(reg), arg) => write!(f, "Y{} A{}", reg, arg),
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VarReg::ArgAndNorm(RegType::Temp(reg), arg) => write!(f, "X{} A{}", reg, arg),
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}
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}
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}
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impl Default for VarReg {
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fn default() -> Self {
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VarReg::Norm(RegType::default())
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}
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}
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#[macro_export]
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macro_rules! temp_v {
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($x:expr) => {
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$crate::parser::ast::RegType::Temp($x)
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};
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}
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#[macro_export]
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macro_rules! perm_v {
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($x:expr) => {
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$crate::parser::ast::RegType::Perm($x)
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};
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}
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#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
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pub enum GenContext {
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Head,
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Mid(usize),
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Last(usize), // Mid & Last: chunk_num
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}
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impl GenContext {
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#[inline]
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pub fn chunk_num(self) -> usize {
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match self {
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GenContext::Head => 0,
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GenContext::Mid(cn) | GenContext::Last(cn) => cn,
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}
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}
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#[inline]
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pub fn is_last(self) -> bool {
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matches!(self, GenContext::Last(_))
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}
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}
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#[bitfield]
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#[derive(Copy, Clone, Debug, PartialEq, Eq, Ord, PartialOrd, Hash)]
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pub struct OpDesc {
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prec: B11,
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spec: B8,
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#[allow(unused)]
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padding: B13,
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}
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impl OpDesc {
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#[inline]
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pub fn build_with(prec: u16, spec: u8) -> Self {
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OpDesc::new().with_spec(spec).with_prec(prec)
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}
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#[inline]
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pub fn get(self) -> (u16, u8) {
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(self.prec(), self.spec())
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}
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pub fn set(&mut self, prec: u16, spec: u8) {
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self.set_prec(prec);
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self.set_spec(spec);
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}
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#[inline]
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pub fn get_prec(self) -> u16 {
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self.prec()
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}
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#[inline]
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pub fn get_spec(self) -> u8 {
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self.spec()
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}
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#[inline]
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pub fn arity(self) -> usize {
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if self.spec() as u32 & (XFX | XFY | YFX) == 0 {
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1
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} else {
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2
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}
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}
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}
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// name and fixity -> operator type and precedence.
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pub type OpDir = IndexMap<(Atom, Fixity), OpDesc, FxBuildHasher>;
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#[derive(Debug, Default, Clone, Copy)]
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pub struct MachineFlags {
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pub double_quotes: DoubleQuotes,
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pub unknown: Unknown,
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}
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#[derive(Debug, Default, Clone, Copy, PartialEq)]
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pub enum DoubleQuotes {
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Atom,
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#[default]
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Chars,
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Codes,
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}
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impl DoubleQuotes {
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pub fn is_chars(self) -> bool {
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matches!(self, DoubleQuotes::Chars)
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}
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pub fn is_atom(self) -> bool {
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matches!(self, DoubleQuotes::Atom)
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}
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pub fn is_codes(self) -> bool {
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matches!(self, DoubleQuotes::Codes)
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}
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}
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#[derive(Debug, Clone, Copy, Default)]
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pub enum Unknown {
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#[default]
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Error,
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Fail,
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Warn,
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}
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impl Unknown {
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pub fn is_error(self) -> bool {
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matches!(self, Unknown::Error)
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}
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pub fn is_fail(self) -> bool {
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matches!(self, Unknown::Fail)
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}
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pub fn is_warn(self) -> bool {
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matches!(self, Unknown::Warn)
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}
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}
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pub fn default_op_dir() -> OpDir {
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let mut op_dir = OpDir::with_hasher(FxBuildHasher::default());
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op_dir.insert(
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(atom!(":-"), Fixity::In),
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OpDesc::build_with(1200, XFX as u8),
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);
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op_dir.insert(
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(atom!(":-"), Fixity::Pre),
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OpDesc::build_with(1200, FX as u8),
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);
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op_dir.insert(
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(atom!("?-"), Fixity::Pre),
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OpDesc::build_with(1200, FX as u8),
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);
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op_dir.insert(
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(atom!(","), Fixity::In),
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OpDesc::build_with(1000, XFY as u8),
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);
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op_dir
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}
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#[derive(Debug, Clone)]
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pub enum ArithmeticError {
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NonEvaluableFunctor(Literal, usize),
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UninstantiatedVar,
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}
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#[derive(Debug)]
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pub enum ParserError {
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BackQuotedString(usize, usize),
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IO(IOError),
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IncompleteReduction(usize, usize),
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InvalidSingleQuotedCharacter(char),
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LexicalError(lexical::Error),
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MissingQuote(usize, usize),
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NonPrologChar(usize, usize),
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ParseBigInt(usize, usize),
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UnexpectedChar(char, usize, usize),
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// UnexpectedEOF,
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Utf8Error(usize, usize),
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}
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impl ParserError {
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pub fn line_and_col_num(&self) -> Option<(usize, usize)> {
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match self {
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&ParserError::BackQuotedString(line_num, col_num)
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| &ParserError::IncompleteReduction(line_num, col_num)
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| &ParserError::MissingQuote(line_num, col_num)
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| &ParserError::NonPrologChar(line_num, col_num)
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| &ParserError::ParseBigInt(line_num, col_num)
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| &ParserError::UnexpectedChar(_, line_num, col_num)
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| &ParserError::Utf8Error(line_num, col_num) => Some((line_num, col_num)),
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_ => None,
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}
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}
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pub fn as_atom(&self) -> Atom {
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match self {
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ParserError::BackQuotedString(..) => atom!("back_quoted_string"),
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ParserError::IncompleteReduction(..) => atom!("incomplete_reduction"),
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ParserError::InvalidSingleQuotedCharacter(..) => {
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atom!("invalid_single_quoted_character")
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}
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ParserError::IO(e) if e.kind() == ErrorKind::UnexpectedEof => {
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atom!("unexpected_end_of_file")
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}
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ParserError::IO(e) if e.kind() == ErrorKind::InvalidData => {
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atom!("invalid_data")
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}
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ParserError::IO(_) => atom!("input_output_error"),
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ParserError::LexicalError(_) => atom!("lexical_error"),
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ParserError::MissingQuote(..) => atom!("missing_quote"),
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ParserError::NonPrologChar(..) => atom!("non_prolog_character"),
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ParserError::ParseBigInt(..) => atom!("cannot_parse_big_int"),
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ParserError::UnexpectedChar(..) => atom!("unexpected_char"),
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ParserError::Utf8Error(..) => atom!("utf8_conversion_error"),
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}
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}
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#[inline]
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pub fn unexpected_eof() -> Self {
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ParserError::IO(std::io::Error::from(ErrorKind::UnexpectedEof))
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}
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#[inline]
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pub fn is_unexpected_eof(&self) -> bool {
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if let ParserError::IO(e) = self {
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e.kind() == ErrorKind::UnexpectedEof
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} else {
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false
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}
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}
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}
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impl From<lexical::Error> for ParserError {
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fn from(e: lexical::Error) -> ParserError {
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ParserError::LexicalError(e)
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}
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}
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impl From<IOError> for ParserError {
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fn from(e: IOError) -> ParserError {
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ParserError::IO(e)
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}
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}
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impl From<&IOError> for ParserError {
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fn from(error: &IOError) -> ParserError {
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if error.get_ref().filter(|e| e.is::<BadUtf8Error>()).is_some() {
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ParserError::Utf8Error(0, 0)
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} else {
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ParserError::IO(error.kind().into())
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}
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}
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}
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#[derive(Debug, Clone, Copy)]
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pub struct CompositeOpDir<'a, 'b> {
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pub primary_op_dir: Option<&'b OpDir>,
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pub secondary_op_dir: &'a OpDir,
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}
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impl<'a, 'b> CompositeOpDir<'a, 'b> {
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#[inline]
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pub fn new(secondary_op_dir: &'a OpDir, primary_op_dir: Option<&'b OpDir>) -> Self {
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CompositeOpDir {
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primary_op_dir,
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secondary_op_dir,
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}
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}
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#[inline]
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pub(crate) fn get(&self, name: Atom, fixity: Fixity) -> Option<OpDesc> {
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let entry = if let Some(primary_op_dir) = &self.primary_op_dir {
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primary_op_dir.get(&(name, fixity))
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} else {
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None
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};
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entry
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.or_else(move || self.secondary_op_dir.get(&(name, fixity)))
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.cloned()
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}
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}
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#[derive(Debug, Clone, Copy, Eq, Hash, PartialEq, PartialOrd, Ord)]
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pub enum Fixity {
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In,
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Post,
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Pre,
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}
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#[bitfield]
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#[repr(u64)]
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#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq)]
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pub struct Fixnum {
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num: B56,
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#[allow(unused)]
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f: bool,
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#[allow(unused)]
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m: bool,
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#[allow(unused)]
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tag: B6,
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}
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impl Fixnum {
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#[inline]
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pub fn build_with(num: i64) -> Self {
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Fixnum::new()
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.with_num(u64::from_ne_bytes(num.to_ne_bytes()) & ((1 << 56) - 1))
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.with_tag(HeapCellValueTag::Fixnum as u8)
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.with_m(false)
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.with_f(false)
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}
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#[inline]
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pub fn as_cutpoint(num: i64) -> Self {
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Fixnum::new()
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.with_num(u64::from_ne_bytes(num.to_ne_bytes()) & ((1 << 56) - 1))
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.with_tag(HeapCellValueTag::CutPoint as u8)
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.with_m(false)
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.with_f(false)
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}
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#[inline]
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pub fn get_tag(&self) -> HeapCellValueTag {
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use scryer_modular_bitfield::Specifier;
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HeapCellValueTag::from_bytes(self.tag()).unwrap()
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}
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#[inline]
|
|
pub fn build_with_checked(num: i64) -> Result<Self, OutOfBounds> {
|
|
const UPPER_BOUND: i64 = (1 << 55) - 1;
|
|
const LOWER_BOUND: i64 = -(1 << 55);
|
|
|
|
if (LOWER_BOUND..=UPPER_BOUND).contains(&num) {
|
|
Ok(Fixnum::new()
|
|
.with_m(false)
|
|
.with_f(false)
|
|
.with_tag(HeapCellValueTag::Fixnum as u8)
|
|
.with_num(u64::from_ne_bytes(num.to_ne_bytes()) & ((1 << 56) - 1)))
|
|
} else {
|
|
Err(OutOfBounds {})
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn get_num(self) -> i64 {
|
|
let n = self.num() as i64;
|
|
let (n, overflowed) = (n << 8).overflowing_shr(8);
|
|
debug_assert!(!overflowed);
|
|
n
|
|
}
|
|
}
|
|
|
|
impl Neg for Fixnum {
|
|
type Output = Self;
|
|
|
|
#[inline]
|
|
fn neg(self) -> Self::Output {
|
|
Fixnum::build_with(-self.get_num())
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
|
|
pub enum Literal {
|
|
Atom(Atom),
|
|
Char(char),
|
|
CodeIndex(CodeIndex),
|
|
Fixnum(Fixnum),
|
|
Integer(TypedArenaPtr<Integer>),
|
|
Rational(TypedArenaPtr<Rational>),
|
|
Float(F64Offset),
|
|
String(Atom),
|
|
}
|
|
|
|
impl From<F64Ptr> for Literal {
|
|
#[inline(always)]
|
|
fn from(ptr: F64Ptr) -> Literal {
|
|
Literal::Float(ptr.as_offset())
|
|
}
|
|
}
|
|
|
|
impl fmt::Display for Literal {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
match self {
|
|
Literal::Atom(ref atom) => {
|
|
write!(f, "{}", atom.flat_index())
|
|
}
|
|
Literal::Char(c) => write!(f, "'{}'", *c as u32),
|
|
Literal::CodeIndex(i) => write!(f, "{:x}", i.as_ptr() as u64),
|
|
Literal::Fixnum(n) => write!(f, "{}", n.get_num()),
|
|
Literal::Integer(ref n) => write!(f, "{}", n),
|
|
Literal::Rational(ref n) => write!(f, "{}", n),
|
|
Literal::Float(ref n) => write!(f, "{}", *n),
|
|
Literal::String(ref s) => write!(f, "\"{}\"", s.as_str()),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Literal {
|
|
pub fn to_atom(&self, atom_tbl: &Arc<AtomTable>) -> Option<Atom> {
|
|
match self {
|
|
Literal::Atom(atom) => Some(atom.defrock_brackets(atom_tbl)),
|
|
_ => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone, PartialEq, Eq)]
|
|
pub struct VarPtr(Rc<RefCell<Var>>);
|
|
|
|
impl Hash for VarPtr {
|
|
#[inline(always)]
|
|
fn hash<H: Hasher>(&self, hasher: &mut H) {
|
|
self.borrow().hash(hasher)
|
|
}
|
|
}
|
|
|
|
impl Deref for VarPtr {
|
|
type Target = RefCell<Var>;
|
|
|
|
#[inline(always)]
|
|
fn deref(&self) -> &Self::Target {
|
|
self.0.deref()
|
|
}
|
|
}
|
|
|
|
impl VarPtr {
|
|
#[inline(always)]
|
|
pub(crate) fn borrow(&self) -> Ref<'_, Var> {
|
|
self.0.borrow()
|
|
}
|
|
|
|
#[inline(always)]
|
|
pub(crate) fn borrow_mut(&self) -> RefMut<'_, Var> {
|
|
self.0.borrow_mut()
|
|
}
|
|
|
|
pub(crate) fn to_var_num(&self) -> Option<usize> {
|
|
match *self.borrow() {
|
|
Var::Generated(var_num) => Some(var_num),
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
pub(crate) fn set(&self, var: Var) {
|
|
let mut var_ref = self.borrow_mut();
|
|
*var_ref = var;
|
|
}
|
|
}
|
|
|
|
impl From<Var> for VarPtr {
|
|
#[inline(always)]
|
|
fn from(value: Var) -> VarPtr {
|
|
VarPtr(Rc::new(RefCell::new(value)))
|
|
}
|
|
}
|
|
|
|
impl From<String> for VarPtr {
|
|
#[inline(always)]
|
|
fn from(value: String) -> VarPtr {
|
|
VarPtr::from(Var::from(value))
|
|
}
|
|
}
|
|
|
|
impl From<&str> for VarPtr {
|
|
#[inline(always)]
|
|
fn from(value: &str) -> VarPtr {
|
|
VarPtr::from(value.to_owned())
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
|
|
pub enum Var {
|
|
Generated(usize),
|
|
InSitu(usize),
|
|
Named(String),
|
|
}
|
|
|
|
impl From<String> for Var {
|
|
#[inline(always)]
|
|
fn from(value: String) -> Var {
|
|
Var::Named(value)
|
|
}
|
|
}
|
|
|
|
impl From<&str> for Var {
|
|
#[inline(always)]
|
|
fn from(value: &str) -> Var {
|
|
Var::Named(value.to_owned())
|
|
}
|
|
}
|
|
|
|
impl Var {
|
|
#[inline(always)]
|
|
pub fn as_str(&self) -> Option<&str> {
|
|
match self {
|
|
Var::Named(value) => Some(value),
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
#[allow(clippy::inherent_to_string)]
|
|
#[inline(always)]
|
|
pub fn to_string(&self) -> String {
|
|
match self {
|
|
Var::InSitu(n) | Var::Generated(n) => format!("_{}", n),
|
|
Var::Named(value) => value.to_owned(),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone)]
|
|
pub enum Term {
|
|
AnonVar,
|
|
Clause(Cell<RegType>, Atom, Vec<Term>),
|
|
Cons(Cell<RegType>, Box<Term>, Box<Term>),
|
|
Literal(Cell<RegType>, Literal),
|
|
// PartialString wraps a String in anticipation of it absorbing
|
|
// other PartialString variants in as_partial_string.
|
|
PartialString(Cell<RegType>, String, Box<Term>),
|
|
CompleteString(Cell<RegType>, Atom),
|
|
Var(Cell<VarReg>, VarPtr),
|
|
}
|
|
|
|
impl Term {
|
|
pub fn into_literal(self) -> Option<Literal> {
|
|
match self {
|
|
Term::Literal(_, c) => Some(c),
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
pub fn first_arg(&self) -> Option<&Term> {
|
|
match self {
|
|
Term::Clause(_, _, ref terms) => terms.first(),
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
pub fn set_name(&mut self, new_name: Atom) {
|
|
match self {
|
|
Term::Literal(_, Literal::Atom(ref mut atom)) | Term::Clause(_, ref mut atom, ..) => {
|
|
*atom = new_name;
|
|
}
|
|
_ => {}
|
|
}
|
|
}
|
|
|
|
pub fn name(&self) -> Option<Atom> {
|
|
match self {
|
|
&Term::Literal(_, Literal::Atom(ref atom)) | &Term::Clause(_, ref atom, ..) => {
|
|
Some(*atom)
|
|
}
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
pub fn arity(&self) -> usize {
|
|
match self {
|
|
Term::Clause(_, _, ref child_terms, ..) => child_terms.len(),
|
|
_ => 0,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
pub fn source_arity(terms: &[Term]) -> usize {
|
|
if let Some(Term::Literal(_, Literal::CodeIndex(_))) = terms.last() {
|
|
return terms.len() - 1;
|
|
}
|
|
|
|
terms.len()
|
|
}
|
|
|
|
pub(crate) fn unfold_by_str_once(term: &mut Term, s: Atom) -> Option<(Term, Term)> {
|
|
if let Term::Clause(_, ref name, ref mut subterms) = term {
|
|
if let Some(Term::Literal(_, Literal::CodeIndex(_))) = subterms.last() {
|
|
subterms.pop();
|
|
}
|
|
|
|
if name == &s && subterms.len() == 2 {
|
|
let snd = subterms.pop().unwrap();
|
|
let fst = subterms.pop().unwrap();
|
|
|
|
return Some((fst, snd));
|
|
}
|
|
}
|
|
|
|
None
|
|
}
|
|
|
|
pub fn unfold_by_str(mut term: Term, s: Atom) -> Vec<Term> {
|
|
let mut terms = vec![];
|
|
|
|
while let Some((fst, snd)) = unfold_by_str_once(&mut term, s) {
|
|
terms.push(fst);
|
|
term = snd;
|
|
}
|
|
|
|
terms.push(term);
|
|
terms
|
|
}
|