Inputmask/js/jquery.inputmask.regex.extensions.js

/*
Input Mask plugin extensions
http://github.com/RobinHerbots/jquery.inputmask
Copyright (c) 2010 - 2013 Robin Herbots
Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php)
Version: 0.0.0

Regex extensions on the jquery.inputmask base
Allows for using regular expressions as a mask
*/
(function ($) {
    $.extend($.inputmask.defaults.aliases, { // $(selector).inputmask("Regex", { regex: "[0-9]*"}
        'Regex': {
            mask: "r",
            greedy: false,
            repeat: "*",
            regex: null,
            regexTokens: null,
            //Thx to https://github.com/slevithan/regex-colorizer for the tokenizer regex
            tokenizer: /\[\^?]?(?:[^\\\]]+|\\[\S\s]?)*]?|\\(?:0(?:[0-3][0-7]{0,2}|[4-7][0-7]?)?|[1-9][0-9]*|x[0-9A-Fa-f]{2}|u[0-9A-Fa-f]{4}|c[A-Za-z]|[\S\s]?)|\((?:\?[:=!]?)?|(?:[?*+]|\{[0-9]+(?:,[0-9]*)?\})\??|[^.?*+^${[()|\\]+|./g,
            quantifierFilter: /[0-9]+[^,]/,
            definitions: {
                'r': {
                    validator: function (chrs, buffer, pos, strict, opts) {

                        function analyseRegex() {
                            var currentToken = {
                                "isQuantifier": false,
                                "matches": [],
                                "isGroup": false
                            }, match, m, opengroups = [];

                            opts.regexTokens = [];

                            // The tokenizer regex does most of the tokenization grunt work
                            while (match = opts.tokenizer.exec(opts.regex)) {
                                m = match[0];
                                switch (m.charAt(0)) {
                                    case "[": // Character class
                                    case "\\":  // Escape or backreference
                                        if (currentToken["isGroup"] !== true) {
                                            currentToken = {
                                                "isQuantifier": false,
                                                "matches": [],
                                                "isGroup": false
                                            };
                                            opts.regexTokens.push(currentToken);
                                        }
                                        if (opengroups.length > 0) {
                                            opengroups[opengroups.length - 1]["matches"].push(m);
                                        } else {
                                            currentToken["matches"].push(m);
                                        }
                                        break;
                                    case "(": // Group opening
                                        currentToken = {
                                            "isQuantifier": false,
                                            "matches": [],
                                            "isGroup": true
                                        };
                                        opengroups.push(currentToken);
                                        break;
                                    case ")": // Group closing
                                        var groupToken = opengroups.pop();
                                        if (opengroups.length > 0) {
                                            opengroups[opengroups.length - 1]["matches"].push(groupToken);
                                        } else {
                                            currentToken = groupToken;
                                            opts.regexTokens.push(currentToken);
                                        }
                                        break;
                                    case "{": //Quantifier
                                        var quantifier = {
                                            "isQuantifier": true,
                                            "matches": [m],
                                            "isGroup": false
                                        };
                                        if (opengroups.length > 0) {
                                            opengroups[opengroups.length - 1]["matches"].push(quantifier);
                                        } else {
                                            currentToken["matches"].push(quantifier);
                                        }
                                        break;
                                    default:
                                        // Vertical bar (alternator) 
                                        // ^ or $ anchor
                                        // Dot (.)
                                        // Literal character sequence
                                        if (opengroups.length > 0) {
                                            opengroups[opengroups.length - 1]["matches"].push(m);
                                        } else {
                                            currentToken["matches"].push(m);
                                        }
                                }
                            }
                        };

                        function validateRegexToken(token, fromGroup) {
                            var isvalid = false;
                            if (fromGroup) {
                                regexPart += "(";
                                openGroupCount++;
                            }
                            for (var mndx = 0; mndx < token["matches"].length; mndx++) {
                                var matchToken = token["matches"][mndx];
                                if (matchToken["isGroup"] == true) {
                                    isvalid = validateRegexToken(matchToken, true);
                                } else if (matchToken["isQuantifier"] == true) {
                                    matchToken = matchToken["matches"][0];
                                    var quantifierMax = opts.quantifierFilter.exec(matchToken)[0].replace("}", "");
                                    var testExp = regexPart + "{1," + quantifierMax + "}"; //relax quantifier validation
                                    for (var j = 0; j < openGroupCount; j++) {
                                        testExp += ")";
                                    }
                                    var exp = new RegExp("^" + testExp + "$");
                                    isvalid = exp.test(bufferStr);
                                    regexPart += matchToken;
                                }
                                else {
                                    regexPart += matchToken;
                                    var testExp = regexPart.replace(/\|$/, "");
                                    for (var j = 0; j < openGroupCount; j++) {
                                        testExp += ")";
                                    }
                                    var exp = new RegExp("^" + testExp + "$");
                                    isvalid = exp.test(bufferStr);
                                }
                                if (isvalid) break;
                            }

                            if (fromGroup) {
                                regexPart += ")";
                                openGroupCount--;
                            }

                            return isvalid;
                        }


                        if (opts.regexTokens == null) {
                            analyseRegex();
                        }

                        var cbuffer = buffer.slice(), regexPart = "", isValid = false, openGroupCount = 0;
                        cbuffer.splice(pos, 0, chrs);
                        var bufferStr = cbuffer.join('');
                        for (var i = 0; i < opts.regexTokens.length; i++) {
                            var regexToken = opts.regexTokens[i];
                            isValid = validateRegexToken(regexToken, regexPart, regexToken["isGroup"]);
                            if (isValid) break;
                        }

                        return isValid;
                    },
                    cardinality: 1
                }
            }
        }
    });
})(jQuery);