xml2js validation

jox.js

'use strict';

var Joi = require('joi');

function attrs (keys) {
    return Joi.object().keys({
        __attr: Joi.compile(keys).required()
    });
}

function text (assertion) {
    assertion = assertion || Joi.string();
    return Joi.alternatives().try(
        Joi.array().length(1).includes(assertion),
        Joi.object().keys({'__text': assertion})
    );
}

function textAttr (textAssertion, attrsAssertion) {
    return Joi.object().keys({
        __attr: attrsAssertion,
        __text: textAssertion
    });
}

function tags (length, assertion) {
    var joi = Joi.array();
    if (length) {
        joi = joi.length(length);
    }
    if (typeof assertion === 'object' && !assertion.isJoi) {
        return joi.includes(Joi.object().keys(assertion));
    }
    return joi.includes(assertion);
}

module.exports = {
    attrs: attrs,
    text: text,
    tags: tags.bind(null, null),
    tag: tags.bind(null, 1),
    textAttr: textAttr
};