alexa-ssml/lib/renderToString.js

JSX for Alexa Skills Kit SSML

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.default = renderToString;

var _xmlbuilder = require('xmlbuilder');

var _xmlbuilder2 = _interopRequireDefault(_xmlbuilder);

var _kebabCase = require('lodash/kebabCase');

var _kebabCase2 = _interopRequireDefault(_kebabCase);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }

// custom stringify options for xml builder
// just kebab-cases all attributes and tag names
var customStringifyOptions = {
    eleName: function eleName() {
        var val = arguments.length <= 0 || arguments[0] === undefined ? '' : arguments[0];

        return this.assertLegalChar((0, _kebabCase2.default)(val));
    },
    attName: function attName() {
        var val = arguments.length <= 0 || arguments[0] === undefined ? '' : arguments[0];

        return (0, _kebabCase2.default)(val);
    }
};

/**
 * Recursively turns jsx children into xml nodes
 * @param {Array} children
 * @param {XMLNode} node
 */
function renderNode(node) {
    var children = arguments.length <= 1 || arguments[1] === undefined ? [] : arguments[1];

    [].concat(_toConsumableArray(children)).forEach(function (child) {
        if (child && child.tag) {
            node.ele(child.tag, child.props);
            renderNode(node, child.children);
            node.end();
        } else {
            node.text(child);
        }
    });
}

/**
 * Nested JSON to pretty string
 * @param {Object} data
 * @return {String}
 */
function renderToString(_ref) {
    var tag = _ref.tag;
    var children = _ref.children;
    var options = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];

    if (tag !== 'speak') {
        throw new Error('SSML must start with a \'speak\' tag, currently \'' + tag + '\'');
    }

    var xml = _xmlbuilder2.default.create(tag, {
        stringify: customStringifyOptions,
        headless: true
    });

    renderNode(xml, children);

    return xml.end(options);
}