numenor/lib/Compiler/Evaluator/index.js

Customizable, safe evaluator of JavaScript-like expressions.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.mark = mark;
exports.hasAsyncValue = hasAsyncValue;
exports.hasConstValue = hasConstValue;
exports.makeConstEval = makeConstEval;
exports.evalConst = evalConst;
exports.AsyncValue = exports.ConstValue = exports.ValueLookup = void 0;
var ValueLookup = Symbol.for('numenor:context:lookup');
exports.ValueLookup = ValueLookup;
var ConstValue = Symbol.for('numenor:eval:const');
exports.ConstValue = ConstValue;
var AsyncValue = Symbol.for('numenor:eval:async');
exports.AsyncValue = AsyncValue;

function mark(attrib, evaluator) {
  if (attrib.isConst) {
    evaluator[ConstValue] = true;
  }

  if (attrib.isAsync) {
    evaluator[AsyncValue] = true;
  }

  return evaluator;
}

function hasAsyncValue(object) {
  return object[AsyncValue] === true;
}

function hasConstValue(object) {
  return object[ConstValue] === true;
}

function makeConstEval(value) {
  return mark({
    isConst: true
  }, function () {
    return value;
  });
}

function evalConst(evaluator) {
  return evaluator(Object.create(null), []);
}