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Parse _name in terms as undefined #78

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Merged
merged 1 commit into from
Mar 11, 2022
Merged

Parse _name in terms as undefined #78

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11 changes: 8 additions & 3 deletions src/lambda-calculus.js
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Original file line number Diff line number Diff line change
Expand Up @@ -232,7 +232,10 @@ function parse(code) {
const r = name(i);
if ( r ) {
const [j,name] = r;
return [j,new V(name)];
if ( name==="_" )
return [j,new V("()")];
else
return [j,new V(name)];
} else
return null;
}
Expand Down Expand Up @@ -325,8 +328,10 @@ function evalLC(term) {
let argEnv;
if ( arg?.term && arg?.env ) ({ term: arg, env: argEnv } = arg); // if callback is passed another callback, or a term
const termVal = new Tuple( typeof arg === 'number' ? fromInt(arg) : arg , new Env(argEnv) );
if (term.name === "_") return runEval( new Tuple(term.body, new Env(env)), stack );
return runEval( new Tuple(term.body, new Env(env).setThunk(term.name, termVal)), stack );
if ( term.name==="_" )
return runEval( new Tuple(term.body, new Env(env)), stack );
else
return runEval( new Tuple(term.body, new Env(env).setThunk(term.name, termVal)), stack );
}
return Object.assign( result, {term,env} );
}
Expand Down