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mondo: improve mondo package api + update readme

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Felix Roos 2025-03-29 21:33:51 +01:00
parent 2e017e46f9
commit c9cafa37fd
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4 changed files with 89 additions and 60 deletions
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24
packages/mondo/mondo.mjs
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@ -306,11 +306,10 @@ export function printAst(ast, compact = false, lvl = 0) {
// lisp runner
export class MondoRunner {
constructor(lib) {
constructor(evaluator) {
this.parser = new MondoParser();
this.lib = lib;
this.assert(!!this.lib.leaf, `no handler for leaft nodes! add "leaf" to your lib`);
this.assert(!!this.lib.call, `no handler for call nodes! add "call" to your lib`);
this.evaluator = evaluator;
this.assert(typeof evaluator === 'function', `expected an evaluator function to be passed to new MondoRunner`);
}
// a helper to check conditions and throw if they are not met
assert(condition, error) {
@ -331,15 +330,10 @@ export class MondoRunner {
} else if (['quotes_double', 'quotes_single'].includes(ast.type)) {
ast.value = ast.value.slice(1, -1);
}
return this.lib.leaf(ast, scope);
return this.evaluator(ast, scope);
}
// is list
if (!ast.children.length) {
throw new Error(`empty list`);
}
if (ast.children[0].value === 'lambda') {
if (ast.children[0]?.value === 'lambda') {
const [_, args, body] = ast.children;
const argNames = args.children.map((child) => child.value);
return (x) => {
@ -349,10 +343,8 @@ export class MondoRunner {
return this.evaluate(body, scope);
};
}
const args = ast.children.map((arg) => this.evaluate(arg, scope));
// we could short circuit arg[0] if its plain...
// evaluate args
return this.lib.call(args[0], args.slice(1), scope);
// evaluate all children before evaluating list
ast.children = ast.children.map((arg) => this.evaluate(arg, scope));
return this.evaluator(ast, scope);
}
}