module.exports = function promiseDeepProp(obj, path, handler) {
const props = path ? path.split(".") : [];
let value = obj;
return promiseEach(props, prop => {
if (!prop)
throw error(INVALID_PATH, {path});
if (isPlainObject(value)) {
if (!value.hasOwnProperty(prop)) {
value = undefined;
return false; // exit the loop
}
} else if (Array.isArray(value)) {
const index = Number(prop);
if (Number.isNaN(index))
throw error(INVALID_INDEX_VALUE, {path, index});
if (index < 0 || index >= value.length)
throw error(INDEX_OUT_OF_RANGE, {path, index});
prop = index;
} else {
throw error(OBJECT_OR_ARRAY_REQUIRED, {path, prop});
}
const parent = value;
value = value[prop];
return promiseSync(handler(value, prop, parent), val => {
value = val;
});
}).then(() => value);
};
// Resolves an expression (i.e. `expr` in `${expr}') of a variable
// reference to a concrete value.
_resolveExpr(vars, expr, options) {
return promiseEach(expr.split(","), ref => {
ref = ref.trim();
const info = this._parseRef(vars, ref, options);
return this._resolveRef(vars, info, options);
});
}
function _cloneObject(obj, path) {
const des = {};
const props = Object.keys(obj);
return promiseEach(props, prop => {
return promiseSync(_clone(obj[prop], prop, obj, path + "." + prop), value => {
des[prop] = value;
});
}).then(() => des);
}