simple lispy parser javascript.js

const expr = ["min", ["max", 0.5, ["toto", 1, 2]],1];

const env = {
  'eegle:min': Math.min,
  'eegle:max': Math.max,
  'UI:COMPONENT': function (x) {
    console.log('Component called', x);
    return 1;
  }
}

function templateLangVisu(expr) {
  if (typeof expr === 'number') {
    return expr;
  } else {
    const [x, ...xs] = expr;
    return x + '(' + xs.map(x => templateLangVisu(x)) + ')' 
  }
}

function templateLangEvaluator(expr, env) {
  console.log(expr);
  if (typeof expr === 'number') {
    return expr;
  } else {
    const [x, ...xs] = expr;
    if (x in env) {
      return env[x](...xs.map(x => templateLangEvaluator(x, env)));
    } else {
      console.log(x, ...xs.map(x => templateLangEvaluator(x, env)))
      return [x, ...xs.map(x => templateLangEvaluator(x, env))]
    }
  }
}


console.log('Expression visualiser');
console.log(templateLangVisu(expr))

console.log('evaluation')
console.log(templateLangEvaluator(expr, env))