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Parker TenBroeck 2026-01-12 23:34:10 -05:00
commit d91768a5e6
24 changed files with 1764 additions and 958 deletions
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37
automata/src/automatan/fa.rs
View file

@ -3,11 +3,13 @@ use std::collections::HashSet;
use super::*;
use crate::{
delta_lower, dual_struct_serde, epsilon, loader::{
delta_lower, dual_struct_serde, epsilon,
loader::{
Context, INITIAL_STATE, Spanned,
ast::{self, Symbol as Sym, TopLevel},
log::LogSink,
}, sigma_upper
},
sigma_upper,
};
dual_struct_serde! {
@ -104,6 +106,12 @@ impl<'a, 'b> FaCompiler<'a, 'b> {
self.compile_top_level(element, span);
}
if self.states_def.is_none() {
self.ctx
.emit_error_locless("states never defined")
.emit_help_logless("add: Q = {...}");
}
if self.alphabet_def.is_none() {
self.ctx
.emit_error_locless("alphabet never defined")
@ -111,12 +119,6 @@ impl<'a, 'b> FaCompiler<'a, 'b> {
.emit_info_logless(concat!("E can be ", sigma_upper!(str)));
}
if self.states_def.is_none() {
self.ctx
.emit_error_locless("states never defined")
.emit_help_logless("add: Q = {...}");
}
if self.final_states_def.is_none() {
self.ctx
.emit_error_locless("final states never defined")
@ -139,9 +141,12 @@ impl<'a, 'b> FaCompiler<'a, 'b> {
}
};
if self.transitions.is_empty(){
self.ctx.emit_warning_locless("no transitions defined")
.emit_help_logless("consider defining one: d(state, letter|epsilon) = state | {state, state, ...}")
if self.transitions.is_empty() {
self.ctx
.emit_warning_locless("no transitions defined")
.emit_help_logless(
"consider defining one: d(state, letter|epsilon) = state | {state, ...}",
)
.emit_info_logless(concat!("d can be ", delta_lower!(str)))
.emit_info_logless(concat!("epsilon can be ", epsilon!(str)));
}
@ -168,11 +173,11 @@ impl<'a, 'b> FaCompiler<'a, 'b> {
TL::Item(S("F", _), list) => self.compile_final_states(list, span),
TL::Item(S(INITIAL_STATE, _), item) => self.compile_initial_state(item, span),
TL::Item(S(name, dest_s), _) => {
self.ctx.emit_error(format!("unknown item {name:?}, expected states, alphabet, final states, initial state"), dest_s);
self.ctx.emit_error(format!("unknown item {name:?}, expected states | alphabet | final states | initial state"), dest_s);
}
TL::TransitionFunc(S((S(delta_lower!(pat), _), args), _), list) => {
self.compile_transition_function(args, list)
TL::TransitionFunc(S((S(delta_lower!(pat), _), args), func), list) => {
self.compile_transition_function(args, func, list)
}
TL::TransitionFunc(S((S(name, _), _), dest_s), _) => {
self.ctx.emit_error(
@ -308,6 +313,7 @@ impl<'a, 'b> FaCompiler<'a, 'b> {
fn compile_transition_function(
&mut self,
args: Spanned<ast::Tuple<'a>>,
function: Span,
list: Spanned<ast::Item<'a>>,
) {
let list = list.set_weak();
@ -363,8 +369,7 @@ impl<'a, 'b> FaCompiler<'a, 'b> {
}
if let Some(previous) = entry.replace(TransitionTo {
state: State(next_state.0),
function: args.1,
function,
transition: item.1,
}) {
self.ctx

19
automata/src/automatan/mod.rs
View file

@ -6,7 +6,6 @@ pub mod fa;
pub mod pda;
pub mod tm;
#[derive(Clone, Copy, Debug)]
pub struct Options {
pub non_deterministic: bool,
@ -14,15 +13,27 @@ pub struct Options {
}
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize), serde(transparent))]
#[cfg_attr(
feature = "serde",
derive(serde::Serialize, serde::Deserialize),
serde(transparent)
)]
pub struct State<'a>(pub &'a str);
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize), serde(transparent))]
#[cfg_attr(
feature = "serde",
derive(serde::Serialize, serde::Deserialize),
serde(transparent)
)]
pub struct Symbol<'a>(pub &'a str);
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize), serde(transparent))]
#[cfg_attr(
feature = "serde",
derive(serde::Serialize, serde::Deserialize),
serde(transparent)
)]
pub struct Letter<'a>(pub &'a str);
#[derive(Clone, Debug)]

626
automata/src/automatan/pda.rs
View file

@ -2,234 +2,513 @@ use std::collections::HashSet;
use super::*;
use crate::{delta_lower, gamma_upper, loader::{
Context, INITIAL_STACK, INITIAL_STATE, Spanned, ast::{self, Symbol as Sym}, log::LogSink
}, sigma_upper};
use crate::{
delta_lower, dual_struct_serde, epsilon, gamma_upper,
loader::{
Context, INITIAL_STACK, INITIAL_STATE, Spanned,
ast::{self, Symbol as Sym},
log::LogSink,
},
sigma_upper,
};
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
pub struct TransitionFrom<'a> {
dual_struct_serde! {
#[derive(Debug, PartialEq, Eq, Clone, Hash)]
pub struct TransitionFrom<'a> {
#[serde(borrow)]
pub state: State<'a>,
#[serde(borrow)]
pub letter: Option<Letter<'a>>,
#[serde(borrow)]
pub symbol: Symbol<'a>,
}
}
#[derive(Debug, PartialEq, Eq, Clone, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
pub struct TransitionTo<'a> {
dual_struct_serde! {
#[derive(Debug, PartialEq, Eq, Clone, Hash)]
pub struct TransitionTo<'a> {
#[serde(borrow)]
pub state: State<'a>,
#[serde(borrow)]
pub stack: Vec<Symbol<'a>>,
pub transition: Span,
pub function: Span,
}
}
#[derive(Clone, Debug)]
#[allow(unused)]
#[cfg_attr(feature = "serde", serde_with::serde_as)]
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
pub struct Pda<'a> {
dual_struct_serde! { {#[serde_with::serde_as]}
#[derive(Clone, Debug)]
pub struct Pda<'a> {
#[serde(borrow)]
pub initial_state: State<'a>,
#[serde(borrow)]
pub initial_stack: Symbol<'a>,
#[serde(borrow)]
pub states: HashMap<State<'a>, StateInfo>,
#[serde(borrow)]
pub symbols: HashMap<Symbol<'a>, SymbolInfo>,
#[serde(borrow)]
pub alphabet: HashMap<Letter<'a>, LetterInfo>,
#[serde(borrow)]
pub final_states: Option<HashMap<State<'a>, StateInfo>>,
#[cfg(feature = "serde")]
#[serde(borrow)]
#[serde_as(as = "serde_with::Seq<(_, _)>")]
pub transitions: HashMap<TransitionFrom<'a>, HashSet<TransitionTo<'a>>>,
}
}
#[cfg(not(feature = "serde"))]
pub transitions: HashMap<TransitionFrom<'a>, HashSet<TransitionTo<'a>>>,
#[derive(Clone, Copy)]
enum AcceptBy {
EmptyStack,
FinalState,
}
pub struct PdaCompiler<'a, 'b> {
ctx: &'b mut Context<'a>,
options: Options,
initial_state: Option<(State<'a>, Span)>,
initial_stack: Option<(Symbol<'a>, Span)>,
accept_by: Option<(AcceptBy, Span)>,
states: HashMap<State<'a>, StateInfo>,
states_def: Option<Span>,
symbols: HashMap<Symbol<'a>, SymbolInfo>,
symbols_def: Option<Span>,
alphabet: HashMap<Letter<'a>, LetterInfo>,
alphabet_def: Option<Span>,
final_states: HashMap<State<'a>, StateInfo>,
final_states_def: Option<Span>,
transitions: HashMap<TransitionFrom<'a>, HashSet<TransitionTo<'a>>>,
}
impl<'a> Pda<'a> {
pub fn parse(
pub fn compile(
items: impl Iterator<Item = Spanned<ast::TopLevel<'a>>>,
ctx: &mut Context<'a>,
options: Options,
) -> Option<Pda<'a>> {
let mut initial_state = None;
let mut initial_stack = None;
PdaCompiler::new(ctx, options).compile(items)
}
}
let mut states = HashMap::new();
let mut symbols = HashMap::new();
let mut alphabet = HashMap::new();
let mut final_states = None;
macro_rules! accept_empty {
($ident: ident) => {
$crate::maker!($ident: "N","n","null","empty","E","Z0","z0")
};
}
let mut transitions: HashMap<TransitionFrom<'a>, HashSet<TransitionTo<'a>>> =
HashMap::new();
macro_rules! accept_final {
($ident: ident) => {
$crate::maker!($ident: "F","final")
};
}
impl<'a, 'b> PdaCompiler<'a, 'b> {
pub fn new(ctx: &'b mut Context<'a>, options: Options) -> Self {
Self {
ctx,
options,
initial_state: Default::default(),
initial_stack: Default::default(),
accept_by: Default::default(),
states: Default::default(),
states_def: Default::default(),
symbols: Default::default(),
symbols_def: Default::default(),
alphabet: Default::default(),
alphabet_def: Default::default(),
final_states: Default::default(),
final_states_def: Default::default(),
transitions: Default::default(),
}
}
pub fn compile(
mut self,
items: impl Iterator<Item = Spanned<ast::TopLevel<'a>>>,
) -> Option<Pda<'a>> {
for Spanned(element, span) in items {
self.compile_top_level(element, span);
}
if self.states_def.is_none() {
self.ctx
.emit_error_locless("states never defined")
.emit_help_logless("add: Q = {...}");
}
if self.alphabet_def.is_none() {
self.ctx
.emit_error_locless("alphabet never defined")
.emit_help_logless("add: E = {...}")
.emit_info_logless(concat!("E can be ", sigma_upper!(str)));
}
if self.symbols_def.is_none() {
self.ctx
.emit_error_locless("stack symbols never defined")
.emit_help_logless("add: G = {...}")
.emit_info_logless(concat!("G can be ", gamma_upper!(str)));
}
if self.accept_by.is_none() {
self.ctx
.emit_error_locless("accept by never defined")
.emit_help_logless("add: accept = N|F")
.emit_info_logless(concat!(
"accept by empty stack N can be ",
accept_empty!(str)
))
.emit_info_logless(concat!(
"accept by final state F can be ",
accept_final!(str)
));
}
if self.final_states_def.is_none()
&& matches!(self.accept_by, Some((AcceptBy::FinalState, _)))
{
self.ctx
.emit_error_locless("final states never defined")
.emit_help_logless("add: F = {...}");
}else if let (Some((AcceptBy::EmptyStack, empty)), Some(states)) = (self.accept_by, self.final_states_def){
self.ctx
.emit_error_locless("final states defined alongside accept by empty stack")
.emit_help("either remote to accept by empty stack", states)
.emit_help("or remote to accept by final state", empty);
}
let initial_state = match self.initial_state {
Some(some) => some.0,
None => {
if self.states.contains_key(&State("q0")) {
self.ctx
.emit_warning_locless("initial state not defined, defaulting to 'q0'")
.emit_help_logless(format!("add: {INITIAL_STATE} = q0"));
} else {
self.ctx
.emit_error_locless("initial state not defined")
.emit_help_logless(format!("add: {INITIAL_STATE} = ..."));
}
State("q0")
}
};
let initial_stack = match self.initial_stack {
Some(some) => some.0,
None => {
if self.symbols.contains_key(&Symbol("Z0")) {
self.ctx
.emit_warning_locless(
"initial stack symbol not defined, defaulting to 'Z0'",
)
.emit_help_logless(format!("add: {INITIAL_STACK} = Z0"));
} else {
self.ctx
.emit_error_locless("initial stack symbol not defined")
.emit_help_logless(format!("add: {INITIAL_STACK} = ..."));
}
Symbol("Z0")
}
};
if self.transitions.is_empty() {
self.ctx
.emit_warning_locless("no transitions defined")
.emit_help_logless(
"consider defining one: d(state, letter|epsilon, symbol) = (state, [symbol]) | {(state, [symbol]), ...}",
)
.emit_info_logless(concat!("d can be ", delta_lower!(str)))
.emit_info_logless(concat!("epsilon can be ", epsilon!(str)));
}
if self.ctx.contains_errors() {
return None;
}
let final_states =
matches!(self.accept_by, Some((AcceptBy::FinalState, _))).then_some(self.final_states);
Some(Pda {
initial_state,
initial_stack,
states: self.states,
symbols: self.symbols,
alphabet: self.alphabet,
final_states,
transitions: self.transitions,
})
}
fn compile_top_level(&mut self, element: ast::TopLevel<'a>, span: Span) {
use Spanned as S;
use ast::TopLevel as TL;
match element {
TL::Item(S("Q", _), list) => {
if !states.is_empty() {
ctx.emit_error("states already set", span);
TL::Item(S("accept", _), item) => self.compile_accept_by(item, span),
TL::Item(S("Q", _), list) => self.compile_states(list, span),
TL::Item(S(gamma_upper!(pat), _), list) => self.compile_symbols(list, span),
TL::Item(S(sigma_upper!(pat), _), list) => self.compile_alphabet(list, span),
TL::Item(S("F", _), list) => self.compile_final_states(list, span),
TL::Item(S(INITIAL_STATE, _), item) => self.compile_initial_state(item, span),
TL::Item(S(INITIAL_STACK, _), item) => self.compile_initial_stack(item, span),
TL::Item(S(name, dest_s), _) => {
self.ctx.emit_error(format!("unknown item {name:?}, expected states | stack symbols | alphabet | accept by | final states | initial state | initial stack"), dest_s);
}
let Some(list) = list.expect_set(ctx) else {
continue;
TL::TransitionFunc(S((S(delta_lower!(pat), _), args), func), list) => {
self.compile_transition_function(args, func, list)
}
TL::TransitionFunc(S((S(name, _), _), dest_s), _) => {
self.ctx.emit_error(
format!(
"unknown function {name:?}, expected transition function ( {} )",
delta_lower!(str)
),
dest_s,
);
}
TL::ProductionRule(_, _) => {
self.ctx.emit_error("unexpected production rule", span);
}
TL::Table() => _ = self.ctx.emit_error("unexpected table", span),
}
}
fn compile_accept_by(&mut self, item: Spanned<ast::Item<'a>>, top_level: Span) {
if let Some((_, previous)) = self.accept_by {
self.ctx
.emit_error("accept by already set", top_level)
.emit_info("previously defined here", previous);
}
let Some(by) = item.expect_ident(self.ctx) else {
return;
};
let by = match by {
accept_empty!(pat) => AcceptBy::EmptyStack,
accept_final!(pat) => AcceptBy::FinalState,
_ => {
self.ctx.emit_error("invalid accept by", item.1);
return;
}
};
self.accept_by = Some((by, top_level));
}
fn compile_states(&mut self, list: Spanned<ast::Item<'a>>, top_level: Span) {
if let Some(previous) = self.states_def {
self.ctx
.emit_error("states already set", top_level)
.emit_info("previously defined here", previous);
}
let Some(list) = list.expect_set(self.ctx) else {
return;
};
for item in list {
let Some(ident) = item.expect_ident(ctx) else {
let Some(ident) = item.expect_ident(self.ctx) else {
continue;
};
if states
if let Some(previous) = self
.states
.insert(State(ident), StateInfo { definition: item.1 })
.is_some()
{
ctx.emit_error("state redefined", item.1);
self.ctx
.emit_error("state redefined", item.1)
.emit_info("previously defined here", previous.definition);
}
}
if list.is_empty() {
ctx.emit_error("states cannot be empty", span);
self.ctx.emit_error("states cannot be empty", top_level);
}
self.states_def = Some(top_level);
}
TL::Item(S(sigma_upper!(pat), _), list) => {
if !alphabet.is_empty() {
ctx.emit_error("alphabet already set", span);
fn compile_symbols(&mut self, list: Spanned<ast::Item<'a>>, top_level: Span) {
if let Some(previous) = self.symbols_def {
self.ctx
.emit_error("stack symbols already set", top_level)
.emit_info("previously defined here", previous);
}
let Some(list) = list.expect_set(ctx) else {
continue;
let Some(list) = list.expect_set(self.ctx) else {
return;
};
for item in list {
let Some(ident) = item.expect_ident(ctx) else {
let Some(ident) = item.expect_ident(self.ctx) else {
continue;
};
if let Some(previous) = self
.symbols
.insert(Symbol(ident), SymbolInfo { definition: item.1 })
{
self.ctx
.emit_error("stack symbol redefined", item.1)
.emit_info("previously defined here", previous.definition);
}
}
if list.is_empty() {
self.ctx.emit_error("states cannot be empty", top_level);
}
self.symbols_def = Some(top_level);
}
fn compile_alphabet(&mut self, list: Spanned<ast::Item<'a>>, top_level: Span) {
if let Some(previous) = self.alphabet_def {
self.ctx
.emit_error("alphabet already set", top_level)
.emit_info("previously defined here", previous);
}
let Some(list) = list.expect_set(self.ctx) else {
return;
};
for item in list {
let Some(ident) = item.expect_ident(self.ctx) else {
continue;
};
if ident.chars().count() != 1 {
ctx.emit_error("letter cannot be longer than one char", item.1);
self.ctx
.emit_error("letter cannot be longer than one char", item.1);
}
if alphabet
if let Some(previous) = self
.alphabet
.insert(Letter(ident), LetterInfo { definition: item.1 })
.is_some()
{
ctx.emit_error("letter redefined", item.1);
self.ctx
.emit_error("letter redefined", item.1)
.emit_help("previously defined here", previous.definition);
}
}
if list.is_empty() {
ctx.emit_error("alphabet cannot be empty", span);
self.ctx.emit_error("alphabet cannot be empty", top_level);
}
self.alphabet_def = Some(top_level);
}
TL::Item(S("F", _), list) => {
if final_states.is_some() {
ctx.emit_error("final states already set", span);
fn compile_final_states(&mut self, list: Spanned<ast::Item<'a>>, top_level: Span) {
if let Some(previous) = self.final_states_def {
self.ctx
.emit_error("final states already set", top_level)
.emit_help("previously defined here", previous);
}
let mut map = HashMap::new();
let Some(list) = list.expect_set(ctx) else {
continue;
let Some(list) = list.expect_set(self.ctx) else {
return;
};
for item in list {
let Some(ident) = item.expect_ident(ctx) else {
let Some(ident) = item.expect_ident(self.ctx) else {
continue;
};
if states.contains_key(&State(ident)) {
if map
if self.states.contains_key(&State(ident)) {
if self
.final_states
.insert(State(ident), StateInfo { definition: item.1 })
.is_some()
{
ctx.emit_error("final state redefined", item.1);
self.ctx.emit_error("final state redefined", item.1);
}
} else {
ctx.emit_error("final state not defined in set of states", item.1);
self.ctx
.emit_error("final state not defined in set of states", item.1);
}
}
final_states = Some(map);
}
TL::Item(S(gamma_upper!(pat), _), list) => {
if !symbols.is_empty() {
ctx.emit_error("stack symbols already set", span);
}
let Some(list) = list.expect_set(ctx) else {
continue;
};
for item in list {
let Some(ident) = item.expect_ident(ctx) else {
continue;
};
if symbols
.insert(Symbol(ident), SymbolInfo { definition: item.1 })
.is_some()
{
ctx.emit_error("stack symbol redefined", item.1);
}
self.final_states_def = Some(top_level);
}
if list.is_empty() {
ctx.emit_error("stack symbols cannot be empty", span);
}
}
TL::Item(S(INITIAL_STATE, _), S(src, src_d)) => match src {
fn compile_initial_state(
&mut self,
Spanned(src, src_d): Spanned<ast::Item<'a>>,
top_level: Span,
) {
match src {
ast::Item::Symbol(Sym::Ident(ident)) => {
if initial_state.is_some() {
ctx.emit_error("initial state already set", span);
if let Some((_, previous)) = self.initial_state {
self.ctx
.emit_error("initial state already set", top_level)
.emit_help("previously defined here", previous);
}
if states.contains_key(&State(ident)) {
initial_state = Some(State(ident))
if self.states.contains_key(&State(ident)) {
self.initial_state = Some((State(ident), top_level))
} else {
ctx.emit_error("initial state symbol not defined as a state", src_d);
self.ctx
.emit_error("initial state symbol not defined as a state", src_d);
}
}
_ => _ = ctx.emit_error("expected ident", src_d),
},
TL::Item(S(INITIAL_STACK, _), S(src, src_d)) => match src {
ast::Item::Symbol(Sym::Ident(ident)) => {
if initial_stack.is_some() {
ctx.emit_error("initial stack already set", span);
_ => _ = self.ctx.emit_error("expected ident", src_d),
}
if symbols.contains_key(&Symbol(ident)) {
initial_stack = Some(Symbol(ident));
} else {
ctx.emit_error(
"initial stack symbol not defined as a stack symbol",
src_d,
);
}
}
_ => _ = ctx.emit_error("expected ident", src_d),
},
TL::Item(S(name, dest_s), _) => {
ctx.emit_error(format!("unknown item {name:?}, expected states, alphabet, symbols, final states, initial state, initial stack"), dest_s);
}
TL::TransitionFunc(S((S(delta_lower!(pat), _), tuple), _), list) => {
fn compile_initial_stack(
&mut self,
Spanned(src, src_d): Spanned<ast::Item<'a>>,
top_level: Span,
) {
match src {
ast::Item::Symbol(Sym::Ident(ident)) => {
if let Some((_, previous)) = self.initial_stack {
self.ctx
.emit_error("initial stack symbol already set", top_level)
.emit_help("previously defined here", previous);
}
if self.symbols.contains_key(&Symbol(ident)) {
self.initial_stack = Some((Symbol(ident), top_level))
} else {
self.ctx
.emit_error("initial stack symbol not defined as a state", src_d);
}
}
_ => _ = self.ctx.emit_error("expected ident", src_d),
}
}
fn compile_transition_function(
&mut self,
args: Spanned<ast::Tuple<'a>>,
function: Span,
list: Spanned<ast::Item<'a>>,
) {
let list = list.set_weak();
let Some((state, letter, stack_symbol)) =
tuple.as_ref().expect_pda_transition_function(ctx)
args.as_ref().expect_pda_transition_function(self.ctx)
else {
continue;
return;
};
if !states.contains_key(&State(state.0)) {
ctx.emit_error("transition state not defined as state", state.1);
continue;
if !self.states.contains_key(&State(state.0)) {
self.ctx
.emit_error("transition state not defined as state", state.1);
return;
};
if !symbols.contains_key(&Symbol(stack_symbol.0)) {
ctx.emit_error(
if !self.symbols.contains_key(&Symbol(stack_symbol.0)) {
self.ctx.emit_error(
"transition stack symbol not defined as stack symbol",
stack_symbol.1,
);
continue;
return;
};
let letter: Option<Letter<'_>> = match letter.0 {
Sym::Epsilon(_) => {
if !options.epsilon_moves {
ctx.emit_error("epsilon moves not permitted", letter.1);
if !self.options.epsilon_moves {
self.ctx.emit_error("epsilon moves not permitted", letter.1);
}
None
}
Sym::Ident(val) => {
if !alphabet.contains_key(&Letter(val)) {
ctx.emit_error(
"transition letter not defined in alphabet",
letter.1,
);
if !self.alphabet.contains_key(&Letter(val)) {
self.ctx
.emit_error("transition letter not defined in alphabet", letter.1);
}
Some(Letter(val))
}
@ -237,14 +516,15 @@ impl<'a> Pda<'a> {
for item in list {
let Some((next_state, stack)) = item
.expect_tuple(ctx)
.and_then(|item| item.expect_pda_transition(ctx))
.expect_tuple(self.ctx)
.and_then(|item| item.expect_pda_transition(self.ctx))
else {
continue;
};
if !states.contains_key(&State(next_state.0)) {
ctx.emit_error("transition state not defined as state", next_state.1);
if !self.states.contains_key(&State(next_state.0)) {
self.ctx
.emit_error("transition state not defined as state", next_state.1);
continue;
};
@ -255,105 +535,39 @@ impl<'a> Pda<'a> {
if matches!(symbol.0, ast::Item::Symbol(Sym::Epsilon(_))) {
return None;
}
let ident = symbol.expect_ident(ctx)?;
let ident = symbol.expect_ident(self.ctx)?;
if !symbols.contains_key(&Symbol(ident)) {
ctx.emit_error("transition stack symbol not defined", symbol.1);
if !self.symbols.contains_key(&Symbol(ident)) {
self.ctx
.emit_error("transition stack symbol not defined", symbol.1);
return None;
};
Some(Symbol(ident))
})
.collect();
let entry: &mut _ = transitions
let entry: &mut _ = self
.transitions
.entry(TransitionFrom {
letter,
state: State(state.0),
symbol: Symbol(stack_symbol.0),
})
.or_default();
if !entry.is_empty() && !options.non_deterministic {
ctx.emit_error("transition already defined for this starting point (non determinism not permitted)", item.1);
if !entry.is_empty() && !self.options.non_deterministic {
self.ctx.emit_error("transition already defined for this starting point (non determinism not permitted)", item.1);
}
if !entry.insert(TransitionTo {
state: State(next_state.0),
stack,
function: tuple.1,
function,
transition: item.1,
}) {
ctx.emit_warning("duplicate transition", item.1);
self.ctx.emit_warning("duplicate transition", item.1);
}
}
}
TL::TransitionFunc(S((S(name, _), _), dest_s), _) => {
ctx.emit_error(
format!(
"unknown function {name:?}, expected transition function ( {} )", delta_lower!(str)
),
dest_s,
);
}
TL::ProductionRule(_, _) => {
ctx.emit_error("unexpected production rule", span);
}
TL::Table() => _ = ctx.emit_error("unexpected table", span),
}
}
if symbols.is_empty() {
ctx.emit_error_locless("stack symbols never defined");
}
if alphabet.is_empty() {
ctx.emit_error_locless("alphabet never defined");
}
if states.is_empty() {
ctx.emit_error_locless("states never defined");
}
let initial_stack = match initial_stack {
Some(some) => some,
None => {
if symbols.contains_key(&Symbol("Z0")) {
ctx.emit_warning_locless(
"initial stack symbol not defined, defaulting to 'Z0'",
);
} else {
ctx.emit_error_locless("initial stack symbol not defined");
}
Symbol("Z0")
}
};
let initial_state = match initial_state {
Some(some) => some,
None => {
if states.contains_key(&State("q0")) {
ctx.emit_warning_locless("initial state not defined, defaulting to 'q0'");
} else {
ctx.emit_error_locless("initial state not defined");
}
State("q0")
}
};
if ctx.contains_errors() {
return None;
}
Some(Pda {
initial_state,
initial_stack,
states,
symbols,
alphabet,
final_states,
transitions,
})
}
}
impl<'a, 'b> Spanned<&'b ast::Tuple<'a>> {
@ -373,10 +587,12 @@ impl<'a, 'b> Spanned<&'b ast::Tuple<'a>> {
Spanned(symbol, *symbol_span),
));
}
_ => _ = ctx.emit_error(
_ => {
_ = ctx.emit_error(
"expected PDA transition function (state, letter|epsilon, symbol)",
self.1,
),
)
}
}
None
}

558
automata/src/automatan/tm.rs
View file

@ -2,291 +2,411 @@ use std::collections::HashSet;
use super::*;
use crate::{delta_lower, gamma_upper, loader::{
BLANK_SYMBOL, Context, Spanned, ast::{self, Symbol as Sym}, log::LogSink
}};
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
pub struct TransitionFrom<'a> {
use crate::{
delta_lower, dual_struct_serde, gamma_upper, loader::{
BLANK_SYMBOL, Context, INITIAL_STATE, Spanned,
ast::{self, Symbol as Sym},
log::LogSink,
}
};
dual_struct_serde! {
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
pub struct TransitionFrom<'a> {
#[serde(borrow)]
pub state: State<'a>,
#[serde(borrow)]
pub symbol: Symbol<'a>,
}
}
#[derive(Debug, PartialEq, Eq, Clone, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum Direction {
#[serde(rename = "<")]
Left,
#[serde(rename = ">")]
Right,
#[serde(rename = "_")]
None,
}
#[derive(Debug, PartialEq, Eq, Clone, Hash)]
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
pub struct TransitionTo<'a> {
dual_struct_serde! {
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
pub struct TransitionTo<'a> {
#[serde(borrow)]
pub state: State<'a>,
#[serde(borrow)]
pub symbol: Symbol<'a>,
pub direction: Direction,
pub transition: Span,
pub function: Span,
}
}
#[derive(Clone, Debug)]
#[allow(unused)]
#[cfg_attr(feature = "serde", serde_with::serde_as)]
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
pub struct Tm<'a> {
dual_struct_serde! {{#[serde_with::serde_as]}
#[derive(Clone, Debug)]
pub struct Tm<'a> {
#[serde(borrow)]
pub initial_state: State<'a>,
pub initial_tape: Symbol<'a>,
#[serde(borrow)]
pub blank_symbol: Symbol<'a>,
#[serde(borrow)]
pub states: HashMap<State<'a>, StateInfo>,
#[serde(borrow)]
pub symbols: HashMap<Symbol<'a>, SymbolInfo>,
#[serde(borrow)]
pub final_states: HashMap<State<'a>, StateInfo>,
#[cfg(feature = "serde")]
#[serde(borrow)]
#[serde_as(as = "serde_with::Seq<(_, _)>")]
pub transitions: HashMap<TransitionFrom<'a>, HashSet<TransitionTo<'a>>>,
#[cfg(not(feature = "serde"))]
pub transitions: HashMap<TransitionFrom<'a>, HashSet<TransitionTo<'a>>>,
}
}
impl<'a> Tm<'a> {
pub fn parse(
pub fn compile(
items: impl Iterator<Item = Spanned<ast::TopLevel<'a>>>,
ctx: &mut Context<'a>,
options: Options,
) -> Option<Tm<'a>> {
let mut initial_state = None;
let mut initial_tape = None;
TmCompiler::new(ctx, options).compile(items)
}
}
let mut states = HashMap::new();
let mut symbols = HashMap::new();
let mut final_states = HashMap::new();
pub struct TmCompiler<'a, 'b> {
ctx: &'b mut Context<'a>,
options: Options,
let mut transitions: HashMap<TransitionFrom<'a>, HashSet<TransitionTo<'a>>> =
HashMap::new();
initial_state: Option<(State<'a>, Span)>,
blank_symbol: Option<(Symbol<'a>, Span)>,
states: HashMap<State<'a>, StateInfo>,
states_def: Option<Span>,
symbols: HashMap<Symbol<'a>, SymbolInfo>,
symbols_def: Option<Span>,
final_states: HashMap<State<'a>, StateInfo>,
final_states_def: Option<Span>,
transitions: HashMap<TransitionFrom<'a>, HashSet<TransitionTo<'a>>>,
}
impl<'a, 'b> TmCompiler<'a, 'b> {
pub fn new(ctx: &'b mut Context<'a>, options: Options) -> Self {
Self {
ctx,
options,
initial_state: Default::default(),
blank_symbol: Default::default(),
states: Default::default(),
states_def: Default::default(),
symbols: Default::default(),
symbols_def: Default::default(),
final_states: Default::default(),
final_states_def: Default::default(),
transitions: Default::default(),
}
}
pub fn compile(
mut self,
items: impl Iterator<Item = Spanned<ast::TopLevel<'a>>>,
) -> Option<Tm<'a>> {
for Spanned(element, span) in items {
self.compile_top_level(element, span);
}
if self.final_states_def.is_none() {
self.ctx
.emit_error_locless("final states never defined")
.emit_help_logless("add: F = {...}");
}
let initial_state = match self.initial_state {
Some(some) => some.0,
None => {
if self.states.contains_key(&State("q0")) {
self.ctx
.emit_warning_locless("initial state not defined, defaulting to 'q0'")
.emit_help_logless(format!("add: {INITIAL_STATE} = q0"));
} else {
self.ctx
.emit_error_locless("initial state not defined")
.emit_help_logless(format!("add: {BLANK_SYMBOL} = ..."));
}
State("q0")
}
};
let blank_symbol = match self.blank_symbol {
Some(some) => some.0,
None => {
if self.symbols.contains_key(&Symbol("B")) {
self.ctx
.emit_warning_locless("blank symbol not defined, defaulting to 'B'")
.emit_help_logless(format!("add: {BLANK_SYMBOL} = B"));
} else {
self.ctx
.emit_error_locless("blank symbol not defined")
.emit_help_logless(format!("add: {BLANK_SYMBOL} = ..."));
}
Symbol("B")
}
};
if self.transitions.is_empty() {
self.ctx
.emit_warning_locless("no transitions defined")
.emit_help_logless(
"consider defining one: d(state, symbol) = (state, symbol, direction) | {(state, symbol, direction), ...}",
)
.emit_info_logless(concat!("d can be ", delta_lower!(str)));
}
if self.ctx.contains_errors() {
return None;
}
Some(Tm {
initial_state,
blank_symbol,
states: self.states,
symbols: self.symbols,
final_states: self.final_states,
transitions: self.transitions,
})
}
fn compile_top_level(&mut self, element: ast::TopLevel<'a>, span: Span) {
use Spanned as S;
use ast::TopLevel as TL;
match element {
TL::Item(S("Q", _), list) => {
if !states.is_empty() {
ctx.emit_error("states already set", span);
}
let Some(list) = list.expect_set(ctx) else {
continue;
};
for item in list {
let Some(ident) = item.expect_ident(ctx) else {
continue;
};
if states
.insert(State(ident), StateInfo { definition: item.1 })
.is_some()
{
ctx.emit_error("state redefined", item.1);
}
}
if list.is_empty() {
ctx.emit_error("states cannot be empty", span);
}
}
TL::Item(S("F", _), list) => {
if !final_states.is_empty() {
ctx.emit_error("final states already set", span);
}
let Some(list) = list.expect_set(ctx) else {
continue;
};
for item in list {
let Some(ident) = item.expect_ident(ctx) else {
continue;
};
if states.contains_key(&State(ident)) {
if final_states
.insert(State(ident), StateInfo { definition: item.1 })
.is_none()
{
ctx.emit_error("final state redefined", item.1);
}
} else {
ctx.emit_error("final state not defined in set of states", item.1);
}
}
}
TL::Item(S(gamma_upper!(pat), _), list) => {
if !symbols.is_empty() {
ctx.emit_error("tape symbols already set", span);
}
let Some(list) = list.expect_set(ctx) else {
continue;
};
for item in list {
let Some(ident) = item.expect_ident(ctx) else {
continue;
};
if symbols
.insert(Symbol(ident), SymbolInfo { definition: item.1 })
.is_some()
{
ctx.emit_error("tape symbol redefined", item.1);
}
}
if list.is_empty() {
ctx.emit_error("tape symbols cannot be empty", span);
}
}
TL::Item(S("q0", _), S(src, src_d)) => match src {
ast::Item::Symbol(Sym::Ident(ident)) => {
if initial_state.is_some() {
ctx.emit_error("initial state already set", span);
}
if states.contains_key(&State(ident)) {
initial_state = Some(State(ident))
} else {
ctx.emit_error("initial state symbol not defined as a state", src_d);
}
}
_ => _ = ctx.emit_error("expected ident", src_d),
},
TL::Item(S(BLANK_SYMBOL, _), S(src, src_d)) => match src {
ast::Item::Symbol(Sym::Ident(ident)) => {
if initial_tape.is_some() {
ctx.emit_error("initial tape symbol already set", span);
}
if symbols.contains_key(&Symbol(ident)) {
initial_tape = Some(Symbol(ident));
} else {
ctx.emit_error(
"initial tape symbol not defined as a tape symbol",
src_d,
);
}
}
_ => _ = ctx.emit_error("expected ident", src_d),
},
TL::Item(S("Q", _), list) => self.compile_states(list, span),
TL::Item(S(gamma_upper!(pat), _), list) => self.compile_symbols(list, span),
TL::Item(S("F", _), list) => self.compile_final_states(list, span),
TL::Item(S(INITIAL_STATE, _), item) => self.compile_initial_state(item, span),
TL::Item(S(BLANK_SYMBOL, _), item) => self.compile_blank_symbol(item, span),
TL::Item(S(name, dest_s), _) => {
ctx.emit_error(format!("unknown item {name:?}, expected states, symbols, final states, initial state, blank symbol"), dest_s);
self.ctx.emit_error(format!("unknown item {name:?}, expected states | symbols | final states | initial state | blank symbol"), dest_s);
}
TL::TransitionFunc(S((S(delta_lower!(pat), _), tuple), _), list) => {
let list = list.set_weak();
let Some((from_state, from_tape)) =
tuple.as_ref().expect_tm_transition_function(ctx)
else {
continue;
};
if !states.contains_key(&State(from_state.0)) {
ctx.emit_error("transition state not defined as state", from_state.1);
continue;
};
if !symbols.contains_key(&Symbol(from_tape.0)) {
ctx.emit_error(
"transition tape symbol not defined as tape symbol",
from_tape.1,
);
continue;
};
for item in list {
let Some((to_state, to_tape, direction)) = item
.expect_tuple(ctx)
.and_then(|item| item.expect_tm_transition(ctx))
else {
continue;
};
if !states.contains_key(&State(to_state.0)) {
ctx.emit_error("transition state not defined as state", to_state.1);
continue;
};
let entry: &mut _ = transitions
.entry(TransitionFrom {
state: State(from_state.0),
symbol: Symbol(from_tape.0),
})
.or_default();
if !entry.is_empty() && !options.non_deterministic {
ctx.emit_error("transition already defined for this starting point (non determinism not permitted)", item.1);
}
if !entry.insert(TransitionTo {
state: State(to_state.0),
symbol: Symbol(to_tape.0),
direction: direction.0,
function: tuple.1,
transition: item.1,
}) {
ctx.emit_warning("duplicate transition", item.1);
}
}
TL::TransitionFunc(S((S(delta_lower!(pat), _), args), func), list) => {
self.compile_transition_function(args, func, list)
}
TL::TransitionFunc(S((S(name, _), _), dest_s), _) => {
ctx.emit_error(
self.ctx.emit_error(
format!(
"unknown function {name:?}, expected transition function ( {} )", delta_lower!(str)
"unknown function {name:?}, expected transition function ( {} )",
delta_lower!(str)
),
dest_s,
);
}
TL::ProductionRule(_, _) => {
ctx.emit_error("unexpected production rule", span);
self.ctx.emit_error("unexpected production rule", span);
}
TL::Table() => _ = ctx.emit_error("unexpected table", span),
TL::Table() => _ = self.ctx.emit_error("unexpected table", span),
}
}
if symbols.is_empty() {
ctx.emit_error_locless("tape symbols never defined");
fn compile_states(&mut self, list: Spanned<ast::Item<'a>>, top_level: Span) {
if let Some(previous) = self.states_def {
self.ctx
.emit_error("states already set", top_level)
.emit_info("previously defined here", previous);
}
let Some(list) = list.expect_set(self.ctx) else {
return;
};
for item in list {
let Some(ident) = item.expect_ident(self.ctx) else {
continue;
};
if let Some(previous) = self
.states
.insert(State(ident), StateInfo { definition: item.1 })
{
self.ctx
.emit_error("state redefined", item.1)
.emit_info("previously defined here", previous.definition);
}
}
if states.is_empty() {
ctx.emit_error_locless("states never defined");
if list.is_empty() {
self.ctx.emit_error("states cannot be empty", top_level);
}
self.states_def = Some(top_level);
}
let initial_tape = match initial_tape {
Some(some) => some,
None => {
if symbols.contains_key(&Symbol("z0")) {
ctx.emit_warning_locless("initial tape symbol not defined, defaulting to 'z0'");
fn compile_symbols(&mut self, list: Spanned<ast::Item<'a>>, top_level: Span) {
if let Some(previous) = self.symbols_def {
self.ctx
.emit_error("stack symbols already set", top_level)
.emit_info("previously defined here", previous);
}
let Some(list) = list.expect_set(self.ctx) else {
return;
};
for item in list {
let Some(ident) = item.expect_ident(self.ctx) else {
continue;
};
if let Some(previous) = self
.symbols
.insert(Symbol(ident), SymbolInfo { definition: item.1 })
{
self.ctx
.emit_error("stack symbol redefined", item.1)
.emit_info("previously defined here", previous.definition);
}
}
if list.is_empty() {
self.ctx.emit_error("states cannot be empty", top_level);
}
self.symbols_def = Some(top_level);
}
fn compile_final_states(&mut self, list: Spanned<ast::Item<'a>>, top_level: Span) {
if let Some(previous) = self.final_states_def {
self.ctx
.emit_error("final states already set", top_level)
.emit_help("previously defined here", previous);
}
let Some(list) = list.expect_set(self.ctx) else {
return;
};
for item in list {
let Some(ident) = item.expect_ident(self.ctx) else {
continue;
};
if self.states.contains_key(&State(ident)) {
if self
.final_states
.insert(State(ident), StateInfo { definition: item.1 })
.is_some()
{
self.ctx.emit_error("final state redefined", item.1);
}
} else {
ctx.emit_error_locless("initial tape symbol not defined");
self.ctx
.emit_error("final state not defined in set of states", item.1);
}
Symbol("z0")
}
self.final_states_def = Some(top_level);
}
fn compile_initial_state(
&mut self,
Spanned(src, src_d): Spanned<ast::Item<'a>>,
top_level: Span,
) {
match src {
ast::Item::Symbol(Sym::Ident(ident)) => {
if let Some((_, previous)) = self.initial_state {
self.ctx
.emit_error("initial state already set", top_level)
.emit_help("previously defined here", previous);
}
if self.states.contains_key(&State(ident)) {
self.initial_state = Some((State(ident), top_level))
} else {
self.ctx
.emit_error("initial state symbol not defined as a state", src_d);
}
}
_ => _ = self.ctx.emit_error("expected ident", src_d),
}
}
fn compile_blank_symbol(
&mut self,
Spanned(src, src_d): Spanned<ast::Item<'a>>,
top_level: Span,
) {
match src {
ast::Item::Symbol(Sym::Ident(ident)) => {
if let Some((_, previous)) = self.blank_symbol {
self.ctx
.emit_error("blank symbol already set", top_level)
.emit_help("previously defined here", previous);
}
if self.symbols.contains_key(&Symbol(ident)) {
self.blank_symbol = Some((Symbol(ident), top_level))
} else {
self.ctx
.emit_error("blank symbol not defined as a symbol", src_d);
}
}
_ => _ = self.ctx.emit_error("expected ident", src_d),
}
}
fn compile_transition_function(
&mut self,
args: Spanned<ast::Tuple<'a>>,
function: Span,
list: Spanned<ast::Item<'a>>,
) {
let list = list.set_weak();
let Some((from_state, from_tape)) = args.as_ref().expect_tm_transition_function(self.ctx)
else {
return;
};
if !self.states.contains_key(&State(from_state.0)) {
self.ctx
.emit_error("transition state not defined as state", from_state.1);
return;
};
if !self.symbols.contains_key(&Symbol(from_tape.0)) {
self.ctx.emit_error(
"transition tape symbol not defined as tape symbol",
from_tape.1,
);
return;
};
let initial_state = match initial_state {
Some(some) => some,
None => {
if states.contains_key(&State("q0")) {
ctx.emit_warning_locless("initial state not defined, defaulting to 'q0'");
} else {
ctx.emit_error_locless("initial state not defined");
}
State("q0")
}
for item in list {
let Some((to_state, to_tape, direction)) = item
.expect_tuple(self.ctx)
.and_then(|item| item.expect_tm_transition(self.ctx))
else {
continue;
};
if ctx.contains_errors() {
return None;
}
if !self.states.contains_key(&State(to_state.0)) {
self.ctx
.emit_error("transition state not defined as state", to_state.1);
continue;
};
Some(Tm {
initial_state,
initial_tape,
states,
symbols,
final_states,
transitions,
let entry: &mut _ = self
.transitions
.entry(TransitionFrom {
state: State(from_state.0),
symbol: Symbol(from_tape.0),
})
.or_default();
if !entry.is_empty() && !self.options.non_deterministic {
self.ctx.emit_error("transition already defined for this starting point (non determinism not permitted)", item.1);
}
if !entry.insert(TransitionTo {
state: State(to_state.0),
symbol: Symbol(to_tape.0),
direction: direction.0,
function,
transition: item.1,
}) {
self.ctx.emit_warning("duplicate transition", item.1);
}
}
}
}
@ -335,10 +455,12 @@ impl<'a> Spanned<&ast::Tuple<'a>> {
Spanned(direction, *direction_span),
));
}
_ => _ = ctx.emit_error(
_ => {
_ = ctx.emit_error(
"expected TM transition function (state, symbol, direction)",
self.1,
),
)
}
}
None
}

80
automata/src/lib.rs
View file

@ -1,7 +1,6 @@
pub mod automatan;
pub mod loader;
#[macro_export]
macro_rules! dual_struct_serde {
($({$(#[$serde_specific:meta])*})?
@ -34,3 +33,82 @@ macro_rules! dual_struct_serde {
}
};
}
#[macro_export]
macro_rules! dual_enum_serde {
(
$( {$(#[$serde_specific:meta])*} )?
$(#[$enum_meta:meta])*
$vis:vis enum $Name:ident $(<$($gen:tt),*>)?
{
$(
$(#[$variant_meta:meta])*
$Variant:ident
$(
// Tuple variant: Variant(T1, T2, ...)
( $(
$(#[$tfield_meta:meta])*
$tfield_ty:ty
),* $(,)? )
)?
$(
// Struct variant: Variant { a: T, b: U, ... }
{ $(
$(#[$sfield_meta:meta])*
$sfield_vis:vis $sfield_name:ident : $sfield_ty:ty
),* $(,)? }
)?
),* $(,)?
}
) => {
#[cfg(feature = "serde")]
$(#[$enum_meta])*
#[derive(serde::Serialize, serde::Deserialize)]
$( $(#[$serde_specific])* )?
$vis enum $Name $(<$($gen),*>)? {
$(
$(#[$variant_meta])*
$Variant
$(
(
$(
$(#[$tfield_meta])*
$tfield_ty
),*
)
)?
$(
{
$(
$(#[$sfield_meta])*
$sfield_vis $sfield_name: $sfield_ty
),*
}
)?
),*
}
#[cfg(not(feature = "serde"))]
$(#[$enum_meta])*
$vis enum $Name $(<$($gen),*>)? {
$(
// strip variant + field attrs in non-serde version
$Variant
$(
(
$(
$tfield_ty
),*
)
)?
$(
{
$(
$sfield_vis $sfield_name: $sfield_ty
),*
}
)?
),*
}
};
}

28
automata/src/loader/ast.rs
View file

@ -77,7 +77,9 @@ impl<'a> Spanned<Item<'a>> {
pub fn expect_ident(&self, ctx: &mut Context<'a>) -> Option<&'a str> {
match &self.0 {
Item::Symbol(Symbol::Ident(ident)) => return Some(ident),
Item::Symbol(Symbol::Epsilon(_)) => _ = ctx.emit_error("expected ident found epsilon", self.1),
Item::Symbol(Symbol::Epsilon(_)) => {
_ = ctx.emit_error("expected ident found epsilon", self.1)
}
Item::Tuple(_) => _ = ctx.emit_error("expected ident found tuple", self.1),
Item::List(_) => _ = ctx.emit_error("expected ident found list", self.1),
}
@ -86,8 +88,12 @@ impl<'a> Spanned<Item<'a>> {
pub fn expect_set(&self, ctx: &mut Context<'a>) -> Option<&[Spanned<Item<'a>>]> {
match &self.0 {
Item::Symbol(Symbol::Ident(_)) => _ = ctx.emit_error("expected set found ident", self.1),
Item::Symbol(Symbol::Epsilon(_)) => _ = ctx.emit_error("expected set found epsilon", self.1),
Item::Symbol(Symbol::Ident(_)) => {
_ = ctx.emit_error("expected set found ident", self.1)
}
Item::Symbol(Symbol::Epsilon(_)) => {
_ = ctx.emit_error("expected set found epsilon", self.1)
}
Item::Tuple(_) => _ = ctx.emit_error("expected set found tuple", self.1),
Item::List(list) => return Some(&list.0),
}
@ -96,8 +102,12 @@ impl<'a> Spanned<Item<'a>> {
pub fn expect_list(&self, ctx: &mut Context<'a>) -> Option<&[Spanned<Item<'a>>]> {
match &self.0 {
Item::Symbol(Symbol::Ident(_)) => _ = ctx.emit_error("expected list found ident", self.1),
Item::Symbol(Symbol::Epsilon(_)) => _ = ctx.emit_error("expected list found epsilon", self.1),
Item::Symbol(Symbol::Ident(_)) => {
_ = ctx.emit_error("expected list found ident", self.1)
}
Item::Symbol(Symbol::Epsilon(_)) => {
_ = ctx.emit_error("expected list found epsilon", self.1)
}
Item::Tuple(_) => _ = ctx.emit_error("expected list found tuple", self.1),
Item::List(list) => return Some(&list.0),
}
@ -120,8 +130,12 @@ impl<'a> Spanned<Item<'a>> {
pub fn expect_tuple(&self, ctx: &mut Context<'a>) -> Option<Spanned<&Tuple<'a>>> {
match &self.0 {
Item::Symbol(Symbol::Ident(_)) => _ = ctx.emit_error("expected tuple found ident", self.1),
Item::Symbol(Symbol::Epsilon(_)) => _ = ctx.emit_error("expected tuple found epsilon", self.1),
Item::Symbol(Symbol::Ident(_)) => {
_ = ctx.emit_error("expected tuple found ident", self.1)
}
Item::Symbol(Symbol::Epsilon(_)) => {
_ = ctx.emit_error("expected tuple found epsilon", self.1)
}
Item::Tuple(tuple) => return Some(Spanned(tuple, self.1)),
Item::List(_) => _ = ctx.emit_error("expected tuple found list", self.1),
}

5
automata/src/loader/lexer.rs
View file

@ -96,7 +96,10 @@ fn begin_ident(c: char) -> bool {
}
fn continue_ident(c: char) -> bool {
c.is_alphanumeric() || c == '_' || c=='\'' || (!c.is_ascii() && !c.is_control() && !c.is_whitespace())
c.is_alphanumeric()
|| c == '_'
|| c == '\''
|| (!c.is_ascii() && !c.is_control() && !c.is_whitespace())
}
impl<'a> std::iter::Iterator for Lexer<'a> {

1
automata/src/loader/log.rs
View file

@ -2,7 +2,6 @@ use std::fmt::Display;
use crate::loader::Span;
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
pub struct Logs {
logs: Vec<LogEntry>,

24
automata/src/loader/mod.rs
View file

@ -1,5 +1,6 @@
use crate::{
automatan::*,
dual_enum_serde,
loader::{
ast::TopLevel,
log::{LogEntry, LogSink},
@ -120,13 +121,14 @@ impl<'a> Context<'a> {
}
}
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
#[cfg_attr(feature = "serde", serde(tag = "type"))]
#[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
pub enum Machine<'a> {
Fa(fa::Fa<'a>),
Pda(pda::Pda<'a>),
Tm(tm::Tm<'a>),
dual_enum_serde! {
{#[serde(tag = "type")] #[serde(rename_all = "snake_case")]}
#[derive(Clone, Debug)]
pub enum Machine<'a> {
Fa(#[serde(borrow)] fa::Fa<'a>),
Pda(#[serde(borrow)] pda::Pda<'a>),
Tm(#[serde(borrow)] tm::Tm<'a>),
}
}
pub fn parse_universal<'a>(ctx: &mut Context<'a>) -> Option<Machine<'a>> {
@ -194,9 +196,9 @@ pub fn parse_universal<'a>(ctx: &mut Context<'a>) -> Option<Machine<'a>> {
Some(match parse_type(items.next(), ctx)? {
Type::Dfa => Machine::Fa(fa::Fa::compile(items, ctx, D)?),
Type::Nfa => Machine::Fa(fa::Fa::compile(items, ctx, N)?),
Type::Dpda => Machine::Pda(pda::Pda::parse(items, ctx, D)?),
Type::Npda => Machine::Pda(pda::Pda::parse(items, ctx, N)?),
Type::Tm => Machine::Tm(tm::Tm::parse(items, ctx, D)?),
Type::Ntm => Machine::Tm(tm::Tm::parse(items, ctx, N)?),
Type::Dpda => Machine::Pda(pda::Pda::compile(items, ctx, D)?),
Type::Npda => Machine::Pda(pda::Pda::compile(items, ctx, N)?),
Type::Tm => Machine::Tm(tm::Tm::compile(items, ctx, D)?),
Type::Ntm => Machine::Tm(tm::Tm::compile(items, ctx, N)?),
})
}

2
automata/src/loader/parser.rs
View file

@ -93,7 +93,7 @@ impl<'a, 'b> Parser<'a, 'b> {
fn parse_as_symbol(&mut self, tok: S<T<'a>>) -> S<Symbol<'a>> {
match tok {
S(T::Tilde, r) => S(Symbol::Epsilon("~"), r),
S(T::Ident(repr@ epsilon!(pat)), r) => S(Symbol::Epsilon(repr), r),
S(T::Ident(repr @ epsilon!(pat)), r) => S(Symbol::Epsilon(repr), r),
S(T::Ident(ident), r) => S(Symbol::Ident(ident), r),
S(got, span) => {
self.ctx.emit_error(

6
cli/src/main.rs
View file

@ -1,5 +1 @@
pub fn main(){
}
pub fn main() {}

50
web/root/src/automata.ts
View file

@ -100,11 +100,11 @@ export type State = string;
export type Symbol = string;
export type Letter = string;
export type Span = [number, number];
export type Span = readonly [number, number];
export type StateInfo = { definition: Span };
export type LetterInfo = { definition: Span };
export type SymbolInfo = { definition: Span };
export type StateInfo = { readonly definition: Span };
export type LetterInfo = { readonly definition: Span };
export type SymbolInfo = { readonly definition: Span };
export type FaTransFrom = {
state: State;
@ -112,16 +112,16 @@ export type FaTransFrom = {
};
export type FaTransTo = {
state: State;
readonly state: State;
transition: Span;
function: Span;
readonly transition: Span;
readonly function: Span;
};
export type Edge = {
repr: string;
function: Span;
transition: Span;
readonly repr: string;
readonly function: Span;
readonly transition: Span;
};
export type Fa = {
@ -139,17 +139,17 @@ export type Fa = {
};
export type PdaTransFrom = {
state: State;
letter: Letter | null;
symbol: Symbol;
readonly state: State;
readonly letter: Letter | null;
readonly symbol: Symbol;
};
export type PdaTransTo = {
state: State;
stack: Symbol[];
readonly state: State;
readonly stack: readonly Symbol[];
transition: Span;
function: Span;
readonly transition: Span;
readonly function: Span;
};
export type Pda = {
@ -172,24 +172,24 @@ export type Pda = {
};
export type TmTransFrom = {
state: State;
symbol: Symbol;
readonly state: State;
readonly symbol: Symbol;
};
export type TmTransTo = {
state: State;
symbol: Symbol;
direction: "L" | "R" | "N";
readonly state: State;
readonly symbol: Symbol;
readonly direction: "<" | ">" | "_";
transition: Span;
function: Span;
readonly transition: Span;
readonly function: Span;
};
export type Tm = {
type: "tm";
initial_state: State;
initial_tape: Symbol;
blank_symbol: Symbol;
states: Map<State, StateInfo>;
symbols: Map<Symbol, SymbolInfo>;
alphabet: Map<Letter, LetterInfo>;

17
web/root/src/bus.ts
View file

@ -1,10 +1,11 @@
// deno-lint-ignore-file
import type { Machine } from "./automata.ts";
import type { Machine, Span } from "./automata.ts";
import type { Example } from "./examples.ts";
import type { Sim, SimStepResult } from "./simulation.ts";
import type wasm from "./wasm.ts";
import type { Text } from "npm:@codemirror/state";
import type { Highlight } from "./highlight.ts";
type Unsubscribe = () => void;
@ -69,14 +70,14 @@ type AppEvents = {
"editor/change": {text: string, doc: Text};
"compiled": {log: wasm.CompileLog[], ansi_log: string, machine: string|undefined};
"automata/sim/update": { simulation: Sim|null };
"automata/sim/update": Sim|null;
"automata/sim/before_step": { simulation: Sim };
"automata/sim/after_step": { simulation: Sim, result: SimStepResult };
"automata/update": { automaton: Machine };
"automata/update": Machine;
"example/selected": {example: Example};
"example/selected": Example;
"controls/editor/set_text": {text: string};
"controls/editor/set_text": string;
"controls/vis/physics": {enabled: boolean};
"controls/vis/reset_network": void;
@ -85,6 +86,12 @@ type AppEvents = {
"controls/sim/reload": void;
"controls/sim/clear": void;
"highlight/one/add": Highlight;
"highlight/one/remove": Highlight;
"highlight/all/remove": void;
"highlight/update": void;
"theme/update": void;
};

2
web/root/src/controls.ts
View file

@ -89,7 +89,7 @@ class Controls {
if (Controls.running) Controls.setRunning(false);
});
bus.on("automata/sim/update", ({ simulation }) => {
bus.on("automata/sim/update", simulation => {
Controls.simulation_active = !!simulation;
if (!simulation) Controls.stop();
});

55
web/root/src/editor.ts
View file

@ -2,6 +2,7 @@
import {
Decoration,
DecorationSet,
EditorView,
highlightActiveLine,
highlightActiveLineGutter,
@ -10,7 +11,7 @@ import {
lineNumbers,
} from "npm:@codemirror/view";
import { EditorState, StateField, Text } from "npm:@codemirror/state";
import { EditorState, RangeSetBuilder, StateEffect, StateField, Text } from "npm:@codemirror/state";
import {
defaultKeymap,
history,
@ -24,6 +25,7 @@ import wasm from "./wasm.ts";
import { Share } from "./share.ts";
import { examples } from "./examples.ts";
import { bus } from "./bus.ts";
import { current, Highlight, HighlightKind } from "./highlight.ts";
function tokenize(text: string): wasm.Tok[] {
try {
@ -45,6 +47,48 @@ function compile(
}
}
function decoForKind(kind: HighlightKind) {
// Use a class per kind so each gets a distinct color via CSS
return Decoration.mark({ class: `cm-highlight cm-highlight-${kind}` });
}
bus.on("highlight/update", _ => {
const arr = current.values().toArray().sort((a, b) => a.span[0]-b.span[0]);
editor.dispatch({ effects: setHighlights.of(arr) });
});
export const setHighlights = StateEffect.define<Highlight[]>();
export const highlightsField = StateField.define<DecorationSet>({
create() {
return Decoration.none;
},
update(highlights, tr) {
// Keep highlights aligned with document edits
highlights = highlights.map(tr.changes);
for (const e of tr.effects) {
if (e.is(setHighlights)) {
const spans = e.value;
const builder = new RangeSetBuilder<Decoration>();
for (const s of spans) {
const from = Math.max(0, Math.min(s.span[0], tr.state.doc.length));
const to = Math.max(0, Math.min(s.span[1], tr.state.doc.length));
if (to > from) builder.add(from, to, decoForKind(s.kind));
}
highlights = builder.finish();
}
}
return highlights;
},
provide: (f) => EditorView.decorations.from(f),
});
const eventBusConnection = StateField.define({
create(state) {
const text = state.doc.toString();
@ -198,6 +242,7 @@ const state = EditorState.create({
keymap.of([...defaultKeymap, ...historyKeymap]),
eventBusConnection,
highlightsField,
diagHover,
EditorView.lineWrapping,
@ -211,15 +256,15 @@ const editor = new EditorView({
bus.on(
"begin",
(_) => bus.emit("controls/editor/set_text", { text: defaultText() }),
(_) => bus.emit("controls/editor/set_text", defaultText()),
);
bus.on("controls/editor/set_text", ({ text }) => {
bus.on("controls/editor/set_text", text => {
editor.dispatch({
changes: { from: 0, to: editor.state.doc.length, insert: text },
});
});
bus.on("example/selected", ({ example }) => {
bus.emit("controls/editor/set_text", { text: example.machine });
bus.on("example/selected", example => {
bus.emit("controls/editor/set_text", example.machine);
});

31
web/root/src/examples.ts
View file

@ -81,11 +81,12 @@ d(q4, 3) = q2`,
new Example(
"DPDA",
"unequal",
`type=DPDA
`type = DPDA
Q = {q0, qas, qeq, qmb, qlb} // states
E = {a, b} // alphabet
T = {z0, A} // stack
F = {qmb, qlb} // final states
accept = F // accept by final state
q0 = q0
z0 = z0
@ -112,6 +113,7 @@ d(qmb, b, z0) = (qmb, z0)`,
Q = {q0, q1} // states
E = {a, b} // alphabet
T = {z0, A, B} // stack
accept = E // accept by empty stack
q0 = q0
z0 = z0
@ -142,6 +144,7 @@ d(q1, b, B) = { (q1, epsilon) }`,
Q = {q0, q1} // states
E = {a, b} // alphabet
T = {z0, A, B} // stack
accept = E // accept by empty stack
q0 = q0
z0 = z0
@ -160,6 +163,30 @@ d(q0, epsilon, B) = { (q1, B) }
d(q1, a, A) = { (q1, epsilon) }
d(q1, b, B) = { (q1, epsilon) }`,
),
new Example("TM", "a^nb^n",
`// accepts all strings on {a,b}+ of the form anbn
type = TM
Q = { q0, q1, q2, q3, q4 } // set of internal states
F = { q4 } // set of final states
T = { a, b, X, Y, B } // tape alphabet
B = B // the blank symbol (tape initializer symbol)
q0 = q0 // initial state
d(q0,a)=(q1,x,R)
d(q1,a)=(q1,a,R)
d(q1,Y)=(q1,y,R)
d(q1,b)=(q2,y,L)
d(q2,Y)=(q2,y,L)
d(q2,a)=(q2,a,L)
d(q2,X)=(q0,x,R)
d(q0,Y)=(q3,y,R)
d(q3,Y)=(q3,y,R)
d(q3,B)=(q4,B,R)
`)
];
const CATEGORY_ORDER: Category[] = [
@ -242,5 +269,5 @@ function buildExamplesDropdown(
const selectEl = document.getElementById("exampleSelect") as HTMLSelectElement;
buildExamplesDropdown(selectEl, examples, (example) => {
bus.emit("example/selected", {example});
bus.emit("example/selected", example);
});

85
web/root/src/highlight.ts Normal file
View file

@ -0,0 +1,85 @@
import type { Span } from "./automata.ts";
import { bus } from "./bus.ts";
import { automaton } from "./simulation.ts";
export type HighlightKind = "focus" | "error" | "warning" | "success";
export type Highlight = {
span: Span,
kind: HighlightKind,
}
type HighlightEntry = {
span: Span,
kind: HighlightKind,
count: number;
}
export const current: Map<string, HighlightEntry> = new Map();
function asKey(highlight: Highlight): string {
return `${highlight.span[0]}:${highlight.span[1]}:${highlight.kind}`
}
export function highlight_from_node_id(node_id: string) {
const state = automaton.states.get(node_id);
if (state) {
bus.emit("highlight/one/add", { kind: "success", span: state.definition })
}
}
export function dehighlight_from_node_id(node_id: string) {
const state = automaton.states.get(node_id);
if (state) {
bus.emit("highlight/one/remove", { kind: "success", span: state.definition })
}
}
export function highlight_from_edge_id(node_id: string) {
for (const edge_value of automaton.edges.get(node_id)!) {
bus.emit("highlight/one/add", { kind: "focus", span: edge_value.function })
bus.emit("highlight/one/add", { kind: "warning", span: edge_value.transition })
}
}
export function dehighlight_from_edge_id(node_id: string) {
for (const edge_value of automaton.edges.get(node_id)!) {
bus.emit("highlight/one/remove", { kind: "focus", span: edge_value.function })
bus.emit("highlight/one/remove", { kind: "warning", span: edge_value.transition })
}
}
bus.on("automata/update", _ => {
bus.emit("highlight/all/remove", undefined);
})
bus.on("highlight/one/add", (highlight) => {
const key = asKey(highlight);
if (current.has(key)) {
current.get(key)!.count += 1;
} else {
current.set(key, { count: 1, ...highlight });
bus.emit("highlight/update", undefined);
}
});
bus.on("highlight/one/remove", (highlight) => {
const key = asKey(highlight);
if (current.has(key)) {
const value = current.get(key)!
value.count -= 1;
if (value.count === 0) {
current.delete(key);
bus.emit("highlight/update", undefined);
}
}
});
bus.on("highlight/all/remove", (_) => {
if (current.size !== 0) {
current.clear();
bus.emit("highlight/update", undefined);
}
});

259
web/root/src/simulation.ts
View file

@ -1,18 +1,26 @@
import { bus } from "./bus.ts";
import type {
Fa,
Machine,
Fa,
Pda,
State,
Symbol,
Tm,
} from "./automata.ts";
import {parse_machine_from_json} from "./automata.ts";
import { FaSim } from "./simulation/fa.ts";
export { FaSim } from "./simulation/fa.ts";
import { PdaSim } from "./simulation/pda.ts";
export { PdaSim } from "./simulation/pda.ts";
import { TmSim } from "./simulation/tm.ts";
export { TmSim } from "./simulation/tm.ts";
export type SimStepResult = "pending" | "accept" | "reject";
export type Sim = FaSim | PdaSim | TmSim;
let simulation: Sim | null = null;
let automaton: Machine = {
export let simulation: Sim | null = null;
export let automaton: Machine = {
type: "fa",
alphabet: new Map(),
final_states: new Map(),
@ -28,7 +36,7 @@ bus.on("compiled", ({ machine }) => {
try {
bus.emit("controls/sim/clear", undefined);
automaton = parse_machine_from_json(machine);
bus.emit("automata/update", { automaton });
bus.emit("automata/update", automaton);
} catch (e) {
console.log(e);
}
@ -36,7 +44,7 @@ bus.on("compiled", ({ machine }) => {
});
bus.on("controls/sim/clear", (_) => {
simulation = null;
bus.emit("automata/sim/update", { simulation: null });
bus.emit("automata/sim/update", null);
});
bus.on("controls/sim/step", (_) => {
if (simulation) {
@ -48,7 +56,7 @@ bus.on("controls/sim/step", (_) => {
}
});
const machineInput = document.getElementById("machineInput") as HTMLInputElement;
machineInput.addEventListener("input", () => bus.emit("automata/sim/update", {simulation: null}));
machineInput.addEventListener("input", () => bus.emit("controls/sim/clear", undefined));
machineInput.addEventListener("keydown", (e) => {
if (e.key === "Enter") {
bus.emit("controls/sim/reload", undefined)
@ -67,10 +75,10 @@ bus.on("controls/sim/reload", (_) => {
simulation = new TmSim(automaton as Tm, input);
break;
}
bus.emit("automata/sim/update", { simulation });
bus.emit("automata/sim/update", simulation);
});
const simulationStatus = document.getElementById("simulationStatus") as HTMLInputElement;
bus.on("automata/sim/update", ({simulation}) => {
bus.on("automata/sim/update", simulation => {
if (!simulation){
simulationStatus.innerText = "N/A"
simulationStatus.style.color = "var(--fg-2)";
@ -92,234 +100,3 @@ bus.on("automata/sim/after_step", ({result}) => {
}
});
export class FaState {
readonly state: State;
readonly position: number;
readonly input: string;
readonly accepted: boolean = false;
private repr!: string;
constructor(state: State, position: number, input: string) {
this.state = state;
this.position = position;
this.input = input;
}
toString(): string {
if (!this.repr) {
this.repr = this.state + " >" + this.input.substring(this.position);
}
return this.repr;
}
}
export class FaSim {
machine: Fa;
paths: FaState[];
input: string;
current_states: Map<string, FaState[]> = new Map();
accepted: FaState[] = [];
constructor(machine: Fa, input: string) {
this.machine = machine;
this.paths = [new FaState(machine.initial_state, 0, input)];
this.current_states.set(machine.initial_state, [this.paths[0]]);
this.input = input;
}
step(): SimStepResult {
if (this.paths.length == 0) return "reject";
if (this.accepted.length != 0) return "accept";
const paths: FaState[] = [];
this.current_states.clear();
const push = (state: FaState) => {
paths.push(state);
if (!this.current_states.has(state.state)) {
this.current_states.set(state.state, []);
}
this.current_states.get(state.state)?.push(state);
if (
state.position == this.input.length &&
this.machine.final_states.has(state.state)
) {
// @ts-expect-error sillllyyyy
state.accepted = true;
this.accepted.push(state);
}
};
for (const path of this.paths) {
const letter_map = this.machine.transitions_components.get(path.state)!;
if (!letter_map) continue;
for (const to of letter_map.get(null) ?? []) {
push(new FaState(to.state, path.position, this.input));
}
if (path.position >= this.input.length) continue;
const char = this.input.charAt(path.position);
for (const to of letter_map.get(char) ?? []) {
push(new FaState(to.state, path.position + 1, this.input));
}
}
this.paths = paths;
if (this.paths.length == 0) return "reject";
if (this.accepted.length != 0) return "accept";
return "pending";
}
}
export class PdaState {
readonly state: State;
readonly stack: Symbol[];
readonly position: number;
readonly input: string;
readonly accepted: boolean = false;
private repr!: string;
constructor(state: State, stack: Symbol[], position: number, input: string) {
this.state = state;
this.stack = stack;
this.position = position;
this.input = input;
}
toString(): string {
if (!this.repr) {
this.repr = this.state + " [" + this.stack + "]" + " >" +
this.input.substring(this.position);
}
return this.repr;
}
}
export class PdaSim {
machine: Pda;
paths: PdaState[];
input: string;
current_states: Map<string, PdaState[]> = new Map();
accepted: PdaState[] = [];
constructor(machine: Pda, input: string) {
this.machine = machine;
this.paths = [
new PdaState(machine.initial_state, [machine.initial_stack], 0, input),
];
this.current_states.set(machine.initial_state, [this.paths[0]]);
this.input = input;
}
step(): SimStepResult {
if (this.paths.length == 0) return "reject";
if (this.accepted.length != 0) return "accept";
const paths: PdaState[] = [];
this.current_states.clear();
const push = (state: PdaState) => {
paths.push(state);
if (!this.current_states.has(state.state)) {
this.current_states.set(state.state, []);
}
this.current_states.get(state.state)?.push(state);
if (
state.position == this.input.length && this.machine.final_states &&
this.machine.final_states.has(state.state) ||
state.position == this.input.length && !this.machine.final_states &&
state.stack.length == 1 &&
state.stack[0] == this.machine.initial_stack
) {
// @ts-expect-error sillllyyyy
state.accepted = true;
this.accepted.push(state);
}
};
for (const path of this.paths) {
const stack = path.stack.pop()!;
const letter_map = this.machine.transitions_components.get(path.state)
?.get(stack);
if (!letter_map) continue;
for (const to of letter_map.get(null) ?? []) {
push(
new PdaState(
to.state,
path.stack.concat(to.stack),
path.position,
this.input,
),
);
}
if (path.position >= this.input.length) continue;
const char = this.input.charAt(path.position);
for (const to of letter_map.get(char) ?? []) {
push(
new PdaState(
to.state,
path.stack.concat(to.stack),
path.position + 1,
this.input,
),
);
}
}
this.paths = paths;
if (this.paths.length == 0) return "reject";
if (this.accepted.length != 0) return "accept";
return "pending";
}
}
export class TmState {
readonly state: State;
readonly tape: Symbol[];
readonly position: number;
readonly input: string;
readonly accepted: boolean = false;
private repr!: string;
constructor(state: State, tape: Symbol[], position: number, input: string) {
this.state = state;
this.tape = tape;
this.position = position;
this.input = input;
}
toString(): string {
if (!this.repr) this.repr = this.state + " " + this.position;
return this.repr;
}
}
export class TmSim {
machine: Tm;
input: string;
current_states: Map<string, TmState[]> = new Map();
accepted: TmState[] = [];
constructor(machine: Tm, input: string) {
this.machine = machine;
this.input = input;
}
step(): SimStepResult {
return "pending";
}
}

117
web/root/src/simulation/fa.ts Normal file
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@ -0,0 +1,117 @@
import type {
Fa,
FaTransTo,
State,
} from "../automata.ts";
import { SimStepResult } from "../simulation.ts";
export type FaState = {
readonly state: State;
readonly position: number;
readonly accepted: boolean;
readonly repr: string;
readonly path: readonly FaTransTo[];
};
type Initializer<T> = { -readonly [P in keyof T]?: T[P] | undefined };
export class FaSim {
readonly machine: Fa;
readonly input: string;
paths: FaState[] = [];
current_states: Map<string, FaState[]> = new Map();
accepted: FaState[] = [];
rejected: FaState[] = [];
constructor(machine: Fa, input: string) {
this.machine = machine;
this.input = input;
this.initial();
}
private accept(state: Initializer<FaState>): boolean {
const pos = state.position ?? 0;
const st = state.state!;
return pos === this.input.length && this.machine.final_states.has(st);
}
private init_state(state: Initializer<FaState>) {
state.position ??= 0;
state.accepted = this.accept(state);
state.repr = state.state + " >" + this.input.substring(state.position);
const frozen = state as FaState;
if (frozen.accepted) this.accepted.push(frozen);
this.paths.push(frozen);
if (!this.current_states.has(frozen.state)) {
this.current_states.set(frozen.state, []);
}
this.current_states.get(frozen.state)!.push(frozen);
}
private initial() {
const state: Initializer<FaState> = {
state: this.machine.initial_state,
position: 0,
path: [],
};
this.init_state(state);
}
private transition(from: FaState, to: FaTransTo, consume: boolean) {
const state: Initializer<FaState> = {
state: to.state,
position: from.position + (consume ? 1 : 0),
path: from.path.concat([to]),
};
this.init_state(state);
}
step(): SimStepResult {
if (this.accepted.length !== 0) return "accept";
if (this.paths.length === 0) return "reject";
const paths = this.paths;
this.paths = [];
this.current_states.clear();
for (const from of paths) {
const letterMap = this.machine.transitions_components.get(from.state);
if (!letterMap) {
this.rejected.push(from);
continue;
}
// epsilon transitions
const eps = letterMap.get(null) ?? [];
for (const to of eps) this.transition(from, to, false);
// consuming transitions
if (from.position >= this.input.length) {
if (eps.length === 0) this.rejected.push(from);
continue;
}
const ch = this.input.charAt(from.position);
const trs = letterMap.get(ch) ?? [];
for (const to of trs) this.transition(from, to, true);
if (eps.length === 0 && trs.length === 0) {
this.rejected.push(from);
}
}
if (this.accepted.length !== 0) return "accept";
if (this.paths.length === 0) return "reject";
return "pending";
}
}

146
web/root/src/simulation/pda.ts Normal file
View file

@ -0,0 +1,146 @@
import type {
Pda,
PdaTransTo,
State,
Symbol
} from "../automata.ts";
import { SimStepResult } from "../simulation.ts";
export type PdaState = {
readonly state: State;
readonly stack: Symbol[];
readonly position: number;
readonly accepted: boolean;
readonly repr: string;
readonly path: readonly PdaTransTo[];
};
type Initializer<T> = { -readonly [P in keyof T]?: T[P] | undefined };
export class PdaSim {
readonly machine: Pda;
readonly input: string;
paths: PdaState[] = [];
current_states: Map<string, PdaState[]> = new Map();
accepted: PdaState[] = [];
rejected: PdaState[] = [];
constructor(machine: Pda, input: string) {
this.machine = machine;
this.input = input;
this.initial();
}
private accept(state: Initializer<PdaState>): boolean {
const pos = state.position ?? 0;
const st = state.state!;
const stack = state.stack ?? [];
//accept by final state
if (pos === this.input.length && this.machine.final_states && this.machine.final_states.has(st)) {
return true;
}
//accept by empty stack
if (pos === this.input.length && !this.machine.final_states && stack.length === 1 && stack[0] === this.machine.initial_stack) {
return true;
}
return false;
}
private init_state(state: Initializer<PdaState>) {
state.stack ??= [this.machine.initial_stack];
state.position ??= 0;
state.accepted = this.accept(state);
state.repr = state.state + " [" + state.stack.join(",") + "] >" + this.input.substring(state.position);
const frozen = state as PdaState;
if (frozen.accepted) this.accepted.push(frozen);
this.paths.push(frozen);
if (!this.current_states.has(frozen.state)) {
this.current_states.set(frozen.state, []);
}
this.current_states.get(frozen.state)!.push(frozen);
}
private initial() {
const state: Initializer<PdaState> = {
state: this.machine.initial_state,
stack: [this.machine.initial_stack],
position: 0,
path: [],
};
this.init_state(state);
}
private transition(from: PdaState, to: PdaTransTo, consume: boolean) {
const stackCopy = from.stack.slice(0, from.stack.length - 1); // pop off top
const nextStack = stackCopy.concat(to.stack);
if (nextStack.length == 0) {
this.rejected.push(from)
return;
}
const state: Initializer<PdaState> = {
state: to.state,
stack: nextStack,
position: from.position + (consume ? 1 : 0),
path: from.path.concat([to]),
};
this.init_state(state);
}
step(): SimStepResult {
if (this.accepted.length !== 0) return "accept";
if (this.paths.length === 0) return "reject";
const paths = this.paths;
this.paths = [];
this.current_states.clear();
for (const from of paths) {
const top = from.stack[from.stack.length - 1];
const letterMap = this.machine.transitions_components.get(from.state)?.get(top);
if (!letterMap) {
this.rejected.push(from);
continue;
}
// epsilon transitions
const epsilon_transitions = letterMap.get(null) ?? [];
for (const to of epsilon_transitions) {
this.transition(from, to, false);
}
if (from.position >= this.input.length) {
if (epsilon_transitions.length == 0){
this.rejected.push(from);
}
continue;
}
// consuming transitions
const ch = this.input.charAt(from.position);
const transitions = letterMap.get(ch) ?? [];
for (const to of transitions) {
this.transition(from, to, true);
}
if (epsilon_transitions.length == 0 && transitions.length == 0){
this.rejected.push(from);
}
}
if (this.accepted.length !== 0) return "accept";
if (this.paths.length === 0) return "reject";
return "pending";
}
}

129
web/root/src/simulation/tm.ts Normal file
View file

@ -0,0 +1,129 @@
import type {
State,
Symbol,
Tm,
TmTransTo
} from "../automata.ts";
import { SimStepResult } from "../simulation.ts";
export type TmState = {
readonly state: State;
readonly tape: Symbol[];
readonly head: number;
readonly accepted: boolean;
readonly repr: string;
readonly path: readonly TmTransTo[];
}
type Initializer<T> = { -readonly [P in keyof T]?: T[P] | undefined };
export class TmSim {
readonly machine: Tm;
paths: TmState[] = [];
readonly input: string;
current_states: Map<string, TmState[]> = new Map();
accepted: TmState[] = [];
rejected: TmState[] = [];
constructor(machine: Tm, input: string) {
this.machine = machine;
this.input = input;
this.initial();
}
private init_state(state: Initializer<TmState>) {
state.repr = state.state + " [ " + this.machine.blank_symbol + " " + state.tape!.map((s, i, _) => i == state.head ? `[${s}]` : s).join(" ") + " " + this.machine.blank_symbol + " ]";
const frozen = state as TmState;
if (frozen.accepted) this.accepted.push(frozen);
this.paths.push(frozen);
if (!this.current_states.has(frozen.state)) {
this.current_states.set(frozen.state, []);
}
this.current_states.get(frozen.state)!.push(frozen);
}
private initial() {
const state: Initializer<TmState> = {
state: this.machine.initial_state,
accepted: this.machine.final_states.has(this.machine.initial_state),
tape: this.input.split(''),
head: 0,
path: [],
};
if (state.tape!.length == 0) state.tape!.push(this.machine.blank_symbol)
this.init_state(state);
}
private transition(from: TmState, to: TmTransTo) {
const state: Initializer<TmState> = {
state: to.state,
accepted: this.machine.final_states.has(to.state),
path: from.path.concat([to]),
};
switch (to.direction) {
case "_":
state.tape = from.tape.slice();
state.tape![from.head] = to.symbol;
state.head = from.head;
break;
case "<":
if (from.head == 0) {
state.tape = from.tape.splice(0, 0, to.symbol);
state.head = 0;
} else {
state.tape = from.tape.slice();
state.tape![from.head] = to.symbol;
state.head = from.head - 1;
}
break;
case ">":
state.head = from.head + 1;
state.tape = from.tape.slice();
state.tape![from.head] = to.symbol;
if (state.head == from.tape.length) {
state.tape!.push(this.machine.blank_symbol);
}
break;
}
this.init_state(state)
}
step(): SimStepResult {
if (this.accepted.length != 0) return "accept";
if (this.paths.length == 0) return "reject";
const paths: TmState[] = this.paths;
this.paths = [];
this.current_states.clear();
for (const from of paths) {
const symbol = from.tape[from.head];
const transitions = this.machine.transitions_components.get(from.state)?.get(symbol) ?? [];
if (transitions.length == 0) {
this.rejected.push(from);
continue;
}
for (const to of transitions) {
this.transition(from, to);
}
}
if (this.accepted.length != 0) return "accept";
if (this.paths.length == 0) return "reject";
return "pending";
}
}

102
web/root/src/visualizer.ts
View file

@ -3,13 +3,13 @@
import * as vis from "npm:vis-network/standalone";
import { bus } from "./bus.ts";
import type { Sim } from "./simulation.ts";
import type { Machine } from "./automata.ts";
import { automaton, simulation } from "./simulation.ts";
import { dehighlight_from_edge_id, dehighlight_from_node_id, highlight_from_edge_id, highlight_from_node_id } from "./highlight.ts";
bus.on("controls/vis/physics", ({enabled}) => {
bus.on("controls/vis/physics", ({ enabled }) => {
network.setOptions({ physics: { enabled } });
network.setOptions({edges: {smooth: enabled}});
network.setOptions({ edges: { smooth: enabled } });
});
bus.on("controls/vis/reset_network", _ => {
try {
@ -29,20 +29,16 @@ bus.on("automata/sim/after_step", _ => {
network.redraw();
});
let simulation: Sim | null = null;
bus.on("automata/sim/update", ({simulation: sim}) => {
simulation = sim;
bus.on("automata/sim/update", _ => {
network.redraw();
});
let automaton: Machine
bus.on("automata/update", automaton => {
bus.on("automata/update", ({automaton: auto}) => {
automaton = auto;
// Populate nodes
for (const state of automaton.states.keys()) {
const size = measureTextWidth(state, getGraphTheme().node_font)/2+10
const size = measureTextWidth(state, getGraphTheme().node_font) / 2 + 10
if (nodes.get(state)) {
nodes.update({
id: state,
@ -75,7 +71,7 @@ bus.on("automata/update", ({automaton: auto}) => {
font,
from: to_from[0],
to: to_from[1],
label: transitions.map(i => i.repr).join(automaton.type=="fa"?",":"\n"),
label: transitions.map(i => i.repr).join(automaton.type == "fa" ? "," : "\n"),
});
} else {
edges.add({
@ -83,7 +79,7 @@ bus.on("automata/update", ({automaton: auto}) => {
font,
from: to_from[0],
to: to_from[1],
label: transitions.map(i => i.repr).join(automaton.type=="fa"?",":"\n"),
label: transitions.map(i => i.repr).join(automaton.type == "fa" ? "," : "\n"),
});
}
}
@ -238,22 +234,6 @@ function measureTextWidth(text: string, font: string): number {
return ctx.measureText(text).width;
}
function chosen_edge(
_: vis.ChosenNodeValues,
id: vis.IdType,
selected: boolean,
hovered: boolean,
) {
}
function chosen_node(
_: vis.ChosenNodeValues,
id: vis.IdType,
selected: boolean,
hovered: boolean,
) {
}
const network: vis.Network = createGraph();
function createGraph(): vis.Network {
@ -286,16 +266,9 @@ function createGraph(): vis.Network {
shape: "custom",
size: 18,
// @ts-expect-error bad library
chosen: {
node: chosen_node,
},
ctxRenderer: renderNode,
},
edges: {
chosen: {
// @ts-expect-error bad library
edge: chosen_edge,
},
arrowStrikethrough: false,
arrows: "to",
},
@ -303,7 +276,7 @@ function createGraph(): vis.Network {
);
vis.DataSet;
network.on("doubleClick", (params: {nodes: string[]}) => {
network.on("doubleClick", (params: { nodes: string[] }) => {
for (const node_id of params.nodes) {
const node: vis.Node = nodes.get(node_id)!;
node.physics = !node.physics;
@ -311,6 +284,49 @@ function createGraph(): vis.Network {
}
});
network.on("hoverEdge", ({ edge }: { edge: string }) => {
highlight_from_edge_id(edge)
});
network.on('blurEdge', ({edge}: {edge: string}) => {
dehighlight_from_edge_id(edge)
});
network.on("hoverNode", ({ node }: { node: string }) => {
highlight_from_node_id(node);
});
network.on('blurNode', ({ node }: { node: string }) => {
dehighlight_from_node_id(node)
});
network.on("selectEdge", item => {
const id = network.getEdgeAt(item.pointer.DOM);
if(id)highlight_from_edge_id(id as string);
});
network.on('deselectEdge', item => {
console.log(item);
for (const edge of item.previousSelection.edges){
console.log(edge);
dehighlight_from_edge_id(edge.id)
}
});
network.on("selectNode", item => {
const id = network.getNodeAt(item.pointer.DOM);
if(id)highlight_from_node_id(id as string);
});
network.on('deselectNode', item => {
console.log(item);
for (const node of item.previousSelection.nodes){
console.log(node);
dehighlight_from_node_id(node.id)
}
});
return network;
}
@ -323,7 +339,7 @@ function renderNode({
state: { selected, hover },
style,
label,
}: {ctx: CanvasRenderingContext2D, id: string, x: number, y: number, state: {selected: boolean, hover: boolean}, style: vis.NodeOptions, label: string}) {
}: { ctx: CanvasRenderingContext2D, id: string, x: number, y: number, state: { selected: boolean, hover: boolean }, style: vis.NodeOptions, label: string }) {
return {
drawNode() {
const t = getGraphTheme();
@ -333,7 +349,7 @@ function renderNode({
const isFinal = automaton.final_states
? automaton.final_states.has(id)
: false;
const isActive = simulation?simulation.current_states.has(id):false;
const isActive = simulation ? simulation.current_states.has(id) : false;
const fill = selected ? t.bg_2 : hover ? t.bg_1 : t.bg_0;
const stroke = isActive ? t.current_node_border : t.node_border;
@ -345,7 +361,7 @@ function renderNode({
ctx.save();
ctx.font = hover||selected?t.node_font_bold:t.node_font;
ctx.font = hover || selected ? t.node_font_bold : t.node_font;
ctx.textAlign = "center";
ctx.textBaseline = "middle";
@ -382,7 +398,7 @@ function renderNode({
const lineH = 14;
let w = 0;
for (const ln of paths) w = Math.max(w, ctx.measureText(ln.toString()).width);
for (const ln of paths) w = Math.max(w, ctx.measureText(ln.repr).width);
const boxW = w + padX * 2;
const boxH = paths.length * lineH + padY * 2;
@ -398,8 +414,8 @@ function renderNode({
ctx.textBaseline = "top";
for (let i = 0; i < paths.length; i++) {
ctx.fillStyle = paths[i].accepted?t.current_node_border:t.fg_0;
ctx.fillText(paths[i].toString(), x, by + padY + i * lineH);
ctx.fillStyle = paths[i].accepted ? t.current_node_border : t.fg_0;
ctx.fillText(paths[i].repr, x, by + padY + i * lineH);
}
}

11
web/root/style/editor.scss
View file

@ -132,3 +132,14 @@
text-underline-offset: 2px;
}
.cm-highlight {
border-radius: 4px;
// padding: 0 1px;
}
.cm-highlight-warning { background: color-mix(in srgb, var(--warning) 40%, var(--bg-0)); }
.cm-highlight-focus { background: color-mix(in srgb, var(--focus) 40%, var(--bg-0)); }
.cm-highlight-success { background: color-mix(in srgb, var(--success) 40%, var(--bg-0)); }
.cm-highlight-error { background: color-mix(in srgb, var(--error) 40%, var(--bg-0)); }

2
web_lib/src/lib.rs
View file

@ -94,7 +94,7 @@ pub fn lex(input: &str) -> Vec<Tok> {
}
// ugly hack to keep single ascii letters non keyworded for user
Token::Ident(ident) if ident.is_ascii() && ident.len()==1 => Kind::Ident,
Token::Ident(ident) if ident.is_ascii() && ident.len() == 1 => Kind::Ident,
Token::Ident(
epsilon!(pat) | delta_lower!(pat) | sigma_upper!(pat) | gamma_upper!(pat),
) => Kind::Keyword,