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improved error messages for TM and PDA's

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ParkerTenBroeck 2026-01-11 21:35:39 -05:00
parent c06a0a0147
commit d6e4fff782
12 changed files with 817 additions and 537 deletions
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27
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)));
}

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)]

705
automata/src/automatan/pda.rs
View file

@ -2,9 +2,15 @@ use std::collections::HashSet;
use super::*;
use crate::{delta_lower, dual_struct_serde, 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,
};
dual_struct_serde! {
#[derive(Debug, PartialEq, Eq, Clone, Hash)]
@ -54,315 +60,446 @@ dual_struct_serde! { {#[serde_with::serde_as]}
}
}
pub struct PdaCompiler<'a, 'b> {
ctx: &'b mut Context<'a>,
options: Options,
initial_state: Option<(State<'a>, Span)>,
initial_stack: Option<(Symbol<'a>, 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 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;
impl<'a, 'b> PdaCompiler<'a, 'b> {
pub fn new(ctx: &'b mut Context<'a>, options: Options) -> Self {
Self {
ctx,
options,
let mut transitions: HashMap<TransitionFrom<'a>, HashSet<TransitionTo<'a>>> =
HashMap::new();
initial_state: Default::default(),
initial_stack: 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 {
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(sigma_upper!(pat), _), list) => {
if !alphabet.is_empty() {
ctx.emit_error("alphabet 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 ident.chars().count() != 1 {
ctx.emit_error("letter cannot be longer than one char", item.1);
}
if alphabet
.insert(Letter(ident), LetterInfo { definition: item.1 })
.is_some()
{
ctx.emit_error("letter redefined", item.1);
}
}
if list.is_empty() {
ctx.emit_error("alphabet cannot be empty", span);
}
}
TL::Item(S("F", _), list) => {
if final_states.is_some() {
ctx.emit_error("final states already set", span);
}
let mut map = HashMap::new();
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 map
.insert(State(ident), StateInfo { definition: item.1 })
.is_some()
{
ctx.emit_error("final state redefined", item.1);
}
} else {
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);
}
}
if list.is_empty() {
ctx.emit_error("stack symbols cannot be empty", span);
}
}
TL::Item(S(INITIAL_STATE, _), 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(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);
}
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) => {
let list = list.set_weak();
let Some((state, letter, stack_symbol)) =
tuple.as_ref().expect_pda_transition_function(ctx)
else {
continue;
};
if !states.contains_key(&State(state.0)) {
ctx.emit_error("transition state not defined as state", state.1);
continue;
};
if !symbols.contains_key(&Symbol(stack_symbol.0)) {
ctx.emit_error(
"transition stack symbol not defined as stack symbol",
stack_symbol.1,
);
continue;
};
let letter: Option<Letter<'_>> = match letter.0 {
Sym::Epsilon(_) => {
if !options.epsilon_moves {
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,
);
}
Some(Letter(val))
}
};
for item in list {
let Some((next_state, stack)) = item
.expect_tuple(ctx)
.and_then(|item| item.expect_pda_transition(ctx))
else {
continue;
};
if !states.contains_key(&State(next_state.0)) {
ctx.emit_error("transition state not defined as state", next_state.1);
continue;
};
let stack: Vec<_> = stack
.iter()
.rev()
.filter_map(|symbol| {
if matches!(symbol.0, ast::Item::Symbol(Sym::Epsilon(_))) {
return None;
}
let ident = symbol.expect_ident(ctx)?;
if !symbols.contains_key(&Symbol(ident)) {
ctx.emit_error("transition stack symbol not defined", symbol.1);
return None;
};
Some(Symbol(ident))
})
.collect();
let entry: &mut _ = 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.insert(TransitionTo {
state: State(next_state.0),
stack,
function: tuple.1,
transition: item.1,
}) {
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),
}
self.compile_top_level(element, span);
}
if symbols.is_empty() {
ctx.emit_error_locless("stack symbols never defined");
if self.states_def.is_none() {
self.ctx
.emit_error_locless("states never defined")
.emit_help_logless("add: Q = {...}");
}
if alphabet.is_empty() {
ctx.emit_error_locless("alphabet never defined");
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 states.is_empty() {
ctx.emit_error_locless("states never defined");
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)));
}
let initial_stack = match initial_stack {
Some(some) => some,
// 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 symbols.contains_key(&Symbol("Z0")) {
ctx.emit_warning_locless(
"initial stack symbol not defined, defaulting to 'Z0'",
);
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 {
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");
self.ctx
.emit_error_locless("initial state not defined")
.emit_help_logless(format!("add: {INITIAL_STATE} = ..."));
}
State("q0")
}
};
if ctx.contains_errors() {
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;
}
Some(Pda {
initial_state,
initial_stack,
states,
symbols,
alphabet,
final_states,
transitions,
states: self.states,
symbols: self.symbols,
alphabet: self.alphabet,
final_states: Some(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) => 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, final states, initial state, initial stack"), dest_s);
}
TL::TransitionFunc(S((S(delta_lower!(pat), _), args), _), list) => {
self.compile_transition_function(args, 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_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 list.is_empty() {
self.ctx.emit_error("states cannot be empty", top_level);
}
self.states_def = Some(top_level);
}
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_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 {
self.ctx
.emit_error("letter cannot be longer than one char", item.1);
}
if let Some(previous) = self
.alphabet
.insert(Letter(ident), LetterInfo { definition: item.1 })
{
self.ctx
.emit_error("letter redefined", item.1)
.emit_help("previously defined here", previous.definition);
}
}
if list.is_empty() {
self.ctx.emit_error("alphabet cannot be empty", top_level);
}
self.alphabet_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 {
self.ctx
.emit_error("final state not defined in set of states", item.1);
}
}
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_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>>,
list: Spanned<ast::Item<'a>>,
) {
let list = list.set_weak();
let Some((state, letter, stack_symbol)) =
args.as_ref().expect_pda_transition_function(self.ctx)
else {
return;
};
if !self.states.contains_key(&State(state.0)) {
self.ctx
.emit_error("transition state not defined as state", state.1);
return;
};
if !self.symbols.contains_key(&Symbol(stack_symbol.0)) {
self.ctx.emit_error(
"transition stack symbol not defined as stack symbol",
stack_symbol.1,
);
return;
};
let letter: Option<Letter<'_>> = match letter.0 {
Sym::Epsilon(_) => {
if !self.options.epsilon_moves {
self.ctx.emit_error("epsilon moves not permitted", letter.1);
}
None
}
Sym::Ident(val) => {
if !self.alphabet.contains_key(&Letter(val)) {
self.ctx
.emit_error("transition letter not defined in alphabet", letter.1);
}
Some(Letter(val))
}
};
for item in list {
let Some((next_state, stack)) = item
.expect_tuple(self.ctx)
.and_then(|item| item.expect_pda_transition(self.ctx))
else {
continue;
};
if !self.states.contains_key(&State(next_state.0)) {
self.ctx
.emit_error("transition state not defined as state", next_state.1);
continue;
};
let stack: Vec<_> = stack
.iter()
.rev()
.filter_map(|symbol| {
if matches!(symbol.0, ast::Item::Symbol(Sym::Epsilon(_))) {
return None;
}
let ident = symbol.expect_ident(self.ctx)?;
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 _ = self
.transitions
.entry(TransitionFrom {
letter,
state: State(state.0),
symbol: Symbol(stack_symbol.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(next_state.0),
stack,
function: args.1,
transition: item.1,
}) {
self.ctx.emit_warning("duplicate transition", item.1);
}
}
}
}
impl<'a, 'b> Spanned<&'b ast::Tuple<'a>> {
@ -382,10 +519,12 @@ impl<'a, 'b> Spanned<&'b ast::Tuple<'a>> {
Spanned(symbol, *symbol_span),
));
}
_ => _ = ctx.emit_error(
"expected PDA transition function (state, letter|epsilon, symbol)",
self.1,
),
_ => {
_ = ctx.emit_error(
"expected PDA transition function (state, letter|epsilon, symbol)",
self.1,
)
}
}
None
}

547
automata/src/automatan/tm.rs
View file

@ -2,9 +2,14 @@ use std::collections::HashSet;
use super::*;
use crate::{delta_lower, dual_struct_serde, gamma_upper, loader::{
BLANK_SYMBOL, Context, Spanned, ast::{self, Symbol as Sym}, log::LogSink
}};
use crate::{
delta_lower, dual_struct_serde,
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> {
@ -43,7 +48,7 @@ dual_struct_serde! {{#[serde_with::serde_as]}
#[serde(borrow)]
pub initial_state: State<'a>,
#[serde(borrow)]
pub initial_tape: Symbol<'a>,
pub blank_symbol: Symbol<'a>,
#[serde(borrow)]
pub states: HashMap<State<'a>, StateInfo>,
#[serde(borrow)]
@ -52,7 +57,7 @@ dual_struct_serde! {{#[serde_with::serde_as]}
#[serde(borrow)]
pub final_states: HashMap<State<'a>, StateInfo>,
#[serde(borrow)]
#[serde_as(as = "serde_with::Seq<(_, _)>")]
pub transitions: HashMap<TransitionFrom<'a>, HashSet<TransitionTo<'a>>>,
@ -65,237 +70,341 @@ impl<'a> Tm<'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 {
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(name, dest_s), _) => {
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(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),
}
self.compile_top_level(element, span);
}
if symbols.is_empty() {
ctx.emit_error_locless("tape symbols never defined");
if self.final_states_def.is_none() {
self.ctx
.emit_error_locless("final states never defined")
.emit_help_logless("add: F = {...}");
}
if states.is_empty() {
ctx.emit_error_locless("states never defined");
}
let initial_tape = match initial_tape {
Some(some) => some,
let initial_state = match self.initial_state {
Some(some) => some.0,
None => {
if symbols.contains_key(&Symbol("z0")) {
ctx.emit_warning_locless("initial tape symbol not defined, defaulting to 'z0'");
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 {
ctx.emit_error_locless("initial tape 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");
self.ctx
.emit_error_locless("initial state not defined")
.emit_help_logless(format!("add: {BLANK_SYMBOL} = ..."));
}
State("q0")
}
};
if ctx.contains_errors() {
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,
initial_tape,
states,
symbols,
final_states,
transitions,
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) => self.compile_states(list, span),
TL::Item(S(delta_lower!(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), _) => {
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), _), args), _), list) => {
self.compile_transition_function(args, 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_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 list.is_empty() {
self.ctx.emit_error("states cannot be empty", top_level);
}
self.states_def = Some(top_level);
}
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 {
self.ctx
.emit_error("final state not defined in set of states", item.1);
}
}
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.states.contains_key(&State(ident)) {
self.blank_symbol = Some((Symbol(ident), top_level))
} else {
self.ctx
.emit_error("blank 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>>,
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;
};
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 !self.states.contains_key(&State(to_state.0)) {
self.ctx
.emit_error("transition state not defined as state", to_state.1);
continue;
};
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: args.1,
transition: item.1,
}) {
self.ctx.emit_warning("duplicate transition", item.1);
}
}
}
}
impl<'a> Spanned<&ast::Tuple<'a>> {
@ -343,10 +452,12 @@ impl<'a> Spanned<&ast::Tuple<'a>> {
Spanned(direction, *direction_span),
));
}
_ => _ = ctx.emit_error(
"expected TM transition function (state, symbol, direction)",
self.1,
),
_ => {
_ = ctx.emit_error(
"expected TM transition function (state, symbol, direction)",
self.1,
)
}
}
None
}

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>,

10
automata/src/loader/mod.rs
View file

@ -1,8 +1,10 @@
use crate::{
automatan::*, dual_enum_serde, dual_struct_serde, loader::{
automatan::*,
dual_enum_serde,
loader::{
ast::TopLevel,
log::{LogEntry, LogSink},
}
},
};
pub mod ast;
@ -119,8 +121,8 @@ impl<'a> Context<'a> {
}
}
dual_enum_serde!{
{#[serde(tag = "type")] #[serde(rename_all = "snake_case")]}
dual_enum_serde! {
{#[serde(tag = "type")] #[serde(rename_all = "snake_case")]}
#[derive(Clone, Debug)]
pub enum Machine<'a> {
Fa(#[serde(borrow)] fa::Fa<'a>),

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() {}

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

@ -189,7 +189,7 @@ 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>;

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,