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/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
/* eslint-disable no-shadow */
define([
'jquery',
'underscore',
'mage/utils/objects',
'mage/utils/strings'
], function ($, _, utils, stringUtils) {
'use strict';
var tmplSettings = _.templateSettings,
interpolate = /\$\{([\s\S]+?)\}/g,
opener = '${',
template,
hasStringTmpls;
/**
* Identifies whether ES6 templates are supported.
*/
hasStringTmpls = (function () {
var testString = 'var foo = "bar"; return `${ foo }` === foo';
try {
return Function(testString)();
} catch (e) {
return false;
}
})();
/**
* Objects can specify how to use templating for their properties - getting that configuration.
*
* To disable rendering for all properties of your object add __disableTmpl: true.
* To disable for specific property add __disableTmpl: {propertyName: true}.
* To limit recursion for a specific property add __disableTmpl: {propertyName: numberOfCycles}.
*
* @param {String} tmpl
* @param {Object | undefined} target
* @returns {Boolean|Object}
*/
function isTmplIgnored(tmpl, target) {
var parsedTmpl;
try {
parsedTmpl = JSON.parse(tmpl);
if (typeof parsedTmpl === 'object') {
return tmpl.includes('__disableTmpl');
}
} catch (e) {
}
if (typeof target !== 'undefined') {
if (typeof target === 'object' && target.hasOwnProperty('__disableTmpl')) {
return target.__disableTmpl;
}
}
return false;
}
if (hasStringTmpls) {
/*eslint-disable no-unused-vars, no-eval*/
/**
* Evaluates template string using ES6 templates.
*
* @param {String} tmpl - Template string.
* @param {Object} $ - Data object used in a template.
* @returns {String} Compiled template.
*/
template = function (tmpl, $) {
return eval('`' + tmpl + '`');
};
/*eslint-enable no-unused-vars, no-eval*/
} else {
/**
* Fallback function used when ES6 templates are not supported.
* Uses underscore templates renderer.
*
* @param {String} tmpl - Template string.
* @param {Object} data - Data object used in a template.
* @returns {String} Compiled template.
*/
template = function (tmpl, data) {
var cached = tmplSettings.interpolate;
tmplSettings.interpolate = interpolate;
tmpl = _.template(tmpl, {
variable: '$'
})(data);
tmplSettings.interpolate = cached;
return tmpl;
};
}
/**
* Checks if provided value contains template syntax.
*
* @param {*} value - Value to be checked.
* @returns {Boolean}
*/
function isTemplate(value) {
return typeof value === 'string' &&
value.indexOf(opener) !== -1 &&
// the below pattern almost always indicates an accident which should not cause template evaluation
// refuse to evaluate
value.indexOf('${{') === -1;
}
/**
* Iteratively processes provided string
* until no templates syntax will be found.
*
* @param {String} tmpl - Template string.
* @param {Object} data - Data object used in a template.
* @param {Boolean} [castString=false] - Flag that indicates whether template
* should be casted after evaluation to a value of another type or
* that it should be leaved as a string.
* @param {Number|undefined} maxCycles - Maximum number of rendering cycles, can be 0.
* @returns {*} Compiled template.
*/
function render(tmpl, data, castString, maxCycles) {
var last = tmpl,
cycles = 0;
while (~tmpl.indexOf(opener) && (typeof maxCycles === 'undefined' || cycles < maxCycles)) {
if (!isTmplIgnored(tmpl)) {
tmpl = template(tmpl, data);
}
if (tmpl === last) {
break;
}
last = tmpl;
cycles++;
}
return castString ?
stringUtils.castString(tmpl) :
tmpl;
}
return {
/**
* Applies provided data to the template.
*
* @param {Object|String} tmpl
* @param {Object} [data] - Data object to match with template.
* @param {Boolean} [castString=false] - Flag that indicates whether template
* should be casted after evaluation to a value of another type or
* that it should be leaved as a string.
* @returns {*}
*
* @example Template defined as a string.
* var source = { foo: 'Random Stuff', bar: 'Some' };
*
* utils.template('${ $.bar } ${ $.foo }', source);
* => 'Some Random Stuff';
*
* @example Template defined as an object.
* var tmpl = {
* key: {'${ $.$data.bar }': '${ $.$data.foo }'},
* foo: 'bar',
* x1: 2, x2: 5,
* delta: '${ $.x2 - $.x1 }',
* baz: 'Upper ${ $.foo.toUpperCase() }'
* };
*
* utils.template(tmpl, source);
* => {
* key: {'Some': 'Random Stuff'},
* foo: 'bar',
* x1: 2, x2: 5,
* delta: 3,
* baz: 'Upper BAR'
* };
*/
template: function (tmpl, data, castString, dontClone) {
if (typeof tmpl === 'string') {
return render(tmpl, data, castString);
}
if (!dontClone) {
tmpl = utils.copy(tmpl);
}
tmpl.$data = data || {};
/**
* Template iterator function.
*/
_.each(tmpl, function iterate(value, key, list) {
var disabled,
maxCycles;
if (key === '$data') {
return;
}
if (isTemplate(key)) {
delete list[key];
key = render(key, tmpl);
list[key] = value;
}
if (isTemplate(value)) {
//Getting template disabling settings, can be true for all disabled and separate settings
//for each property.
disabled = isTmplIgnored(value, list);
if (typeof disabled === 'object' && disabled.hasOwnProperty(key) && disabled[key] !== false) {
//Checking if specific settings for a property provided.
maxCycles = disabled[key];
}
if (disabled === true || maxCycles === true) {
//Rendering for all properties is disabled.
maxCycles = 0;
}
list[key] = render(value, tmpl, castString, maxCycles);
} else if ($.isPlainObject(value) || Array.isArray(value)) {
_.each(value, iterate);
}
});
delete tmpl.$data;
return tmpl;
}
};
});