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utils.js
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utils.js
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/*
* EJS Embedded JavaScript templates
* Copyright 2112 Matthew Eernisse (mde@fleegix.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/**
* Private utility functions
* @module utils
* @private
*/
'use strict';
var regExpChars = /[|\\{}()[\]^$+*?.]/g;
var hasOwnProperty = Object.prototype.hasOwnProperty;
var hasOwn = function (obj, key) { return hasOwnProperty.apply(obj, [key]); };
/**
* Escape characters reserved in regular expressions.
*
* If `string` is `undefined` or `null`, the empty string is returned.
*
* @param {String} string Input string
* @return {String} Escaped string
* @static
* @private
*/
exports.escapeRegExpChars = function (string) {
// istanbul ignore if
if (!string) {
return '';
}
return String(string).replace(regExpChars, '\\$&');
};
var _ENCODE_HTML_RULES = {
'&': '&',
'<': '<',
'>': '>',
'"': '"',
"'": '''
};
var _MATCH_HTML = /[&<>'"]/g;
function encode_char(c) {
return _ENCODE_HTML_RULES[c] || c;
}
/**
* Stringified version of constants used by {@link module:utils.escapeXML}.
*
* It is used in the process of generating {@link ClientFunction}s.
*
* @readonly
* @type {String}
*/
var escapeFuncStr =
'var _ENCODE_HTML_RULES = {\n'
+ ' "&": "&"\n'
+ ' , "<": "<"\n'
+ ' , ">": ">"\n'
+ ' , \'"\': """\n'
+ ' , "\'": "'"\n'
+ ' }\n'
+ ' , _MATCH_HTML = /[&<>\'"]/g;\n'
+ 'function encode_char(c) {\n'
+ ' return _ENCODE_HTML_RULES[c] || c;\n'
+ '};\n';
/**
* Escape characters reserved in XML.
*
* If `markup` is `undefined` or `null`, the empty string is returned.
*
* @implements {EscapeCallback}
* @param {String} markup Input string
* @return {String} Escaped string
* @static
* @private
*/
exports.escapeXML = function (markup) {
return markup == undefined
? ''
: String(markup)
.replace(_MATCH_HTML, encode_char);
};
function escapeXMLToString() {
return Function.prototype.toString.call(this) + ';\n' + escapeFuncStr;
}
try {
if (typeof Object.defineProperty === 'function') {
// If the Function prototype is frozen, the "toString" property is non-writable. This means that any objects which inherit this property
// cannot have the property changed using an assignment. If using strict mode, attempting that will cause an error. If not using strict
// mode, attempting that will be silently ignored.
// However, we can still explicitly shadow the prototype's "toString" property by defining a new "toString" property on this object.
Object.defineProperty(exports.escapeXML, 'toString', { value: escapeXMLToString });
} else {
// If Object.defineProperty() doesn't exist, attempt to shadow this property using the assignment operator.
exports.escapeXML.toString = escapeXMLToString;
}
} catch (err) {
console.warn('Unable to set escapeXML.toString (is the Function prototype frozen?)');
}
/**
* Naive copy of properties from one object to another.
* Does not recurse into non-scalar properties
* Does not check to see if the property has a value before copying
*
* @param {Object} to Destination object
* @param {Object} from Source object
* @return {Object} Destination object
* @static
* @private
*/
exports.shallowCopy = function (to, from) {
from = from || {};
if ((to !== null) && (to !== undefined)) {
for (var p in from) {
if (!hasOwn(from, p)) {
continue;
}
if (p === '__proto__' || p === 'constructor') {
continue;
}
to[p] = from[p];
}
}
return to;
};
/**
* Naive copy of a list of key names, from one object to another.
* Only copies property if it is actually defined
* Does not recurse into non-scalar properties
*
* @param {Object} to Destination object
* @param {Object} from Source object
* @param {Array} list List of properties to copy
* @return {Object} Destination object
* @static
* @private
*/
exports.shallowCopyFromList = function (to, from, list) {
list = list || [];
from = from || {};
if ((to !== null) && (to !== undefined)) {
for (var i = 0; i < list.length; i++) {
var p = list[i];
if (typeof from[p] != 'undefined') {
if (!hasOwn(from, p)) {
continue;
}
if (p === '__proto__' || p === 'constructor') {
continue;
}
to[p] = from[p];
}
}
}
return to;
};
/**
* Simple in-process cache implementation. Does not implement limits of any
* sort.
*
* @implements {Cache}
* @static
* @private
*/
exports.cache = {
_data: {},
set: function (key, val) {
this._data[key] = val;
},
get: function (key) {
return this._data[key];
},
remove: function (key) {
delete this._data[key];
},
reset: function () {
this._data = {};
}
};
/**
* Transforms hyphen case variable into camel case.
*
* @param {String} string Hyphen case string
* @return {String} Camel case string
* @static
* @private
*/
exports.hyphenToCamel = function (str) {
return str.replace(/-[a-z]/g, function (match) { return match[1].toUpperCase(); });
};
/**
* Returns a null-prototype object in runtimes that support it
*
* @return {Object} Object, prototype will be set to null where possible
* @static
* @private
*/
exports.createNullProtoObjWherePossible = (function () {
if (typeof Object.create == 'function') {
return function () {
return Object.create(null);
};
}
if (!({__proto__: null} instanceof Object)) {
return function () {
return {__proto__: null};
};
}
// Not possible, just pass through
return function () {
return {};
};
})();
/**
* Copies own-properties from one object to a null-prototype object for basic
* protection against prototype pollution
*
* @return {Object} Object with own-properties of input object
* @static
* @private
*/
exports.hasOwnOnlyObject = function (obj) {
var o = exports.createNullProtoObjWherePossible();
for (var p in obj) {
if (hasOwn(obj, p)) {
o[p] = obj[p];
}
}
return o;
};