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fixed TM example and compiler error

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Parker TenBroeck 2026-04-10 16:36:42 -04:00
parent 7cfd6c1fcd
commit b26abc1cfc
2 changed files with 16 additions and 8 deletions
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7
automata/src/automatan/tm.rs
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@ -413,6 +413,13 @@ impl<'a, 'b> TmCompiler<'a, 'b> {
.emit_error("transition state not defined as state", to_state.1); .emit_error("transition state not defined as state", to_state.1);
continue; continue;
}; };
if !self.symbols.contains_key(&Symbol(to_tape.0)) {
self.ctx.emit_error(
"transition tape symbol not defined as tape symbol",
to_tape.1,
);
return;
};
let entry: &mut _ = self let entry: &mut _ = self
.transitions .transitions

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

@ -369,7 +369,7 @@ d(q1, b, B) = { (q1, epsilon) }`,
), ),
new Example("TM", "a^nb^n", new Example("TM", "a^nb^n",
`// accepts all strings on {a,b}+ of the form anbn `// accepts all strings on {a,b}+ of the form a^n^bn
type = TM type = TM
Q = { q0, q1, q2, q3, q4 } // set of internal states Q = { q0, q1, q2, q3, q4 } // set of internal states
@ -378,18 +378,19 @@ T = { a, b, X, Y, B } // tape alphabet
B = B // the blank symbol (tape initializer symbol) B = B // the blank symbol (tape initializer symbol)
q0 = q0 // initial state q0 = q0 // initial state
d(q0,a)=(q1,x,R) d(q0,a)=(q1,X,R)
d(q1,a)=(q1,a,R) d(q1,a)=(q1,a,R)
d(q1,Y)=(q1,y,R) d(q1,Y)=(q1,Y,R)
d(q1,b)=(q2,y,L) d(q1,b)=(q2,Y,L)
d(q2,Y)=(q2,y,L) d(q2,Y)=(q2,Y,L)
d(q2,a)=(q2,a,L) d(q2,a)=(q2,a,L)
d(q2,X)=(q0,x,R) d(q2,X)=(q0,X,R)
d(q0,Y)=(q3,y,R) d(q0,Y)=(q3,Y,R)
d(q3,Y)=(q3,y,R) d(q3,Y)=(q3,Y,R)
d(q3,B)=(q4,B,R) d(q3,B)=(q4,B,R)
`), `),
// new Example("CFG", "definition", // new Example("CFG", "definition",