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(function(factory) {
    if (typeof define === 'function' && define.amd) {
        // AMD. Register as an anonymous module.
        define(['jquery'], factory);
    } else if (typeof exports === 'object') {
        // Node/CommonJS
        factory(require('jquery'));
    } else {
        // Browser globals
        factory(jQuery);
    }
}(function($) {

    var ua = navigator.userAgent,
        iPhone = /iphone/i.test(ua),
        chrome = /chrome/i.test(ua),
        android = /android/i.test(ua),
        caretTimeoutId;

    $.mask = {
        //Predefined character definitions
        definitions: {
            '9': "[0-9]",
            'a': "[A-Za-z]",
            '*': "[A-Za-z0-9]"
        },
        autoclear: true,
        dataName: "rawMaskFn",
        placeholder: '_'
    };

    $.fn.extend({
        //Helper Function for Caret positioning
        caret: function(begin, end) {
            var range;

            if (this.length === 0 || this.is(":hidden") || this.get(0) !== document.activeElement) {
                return;
            }

            if (typeof begin == 'number') {
                end = (typeof end === 'number') ? end : begin;
                return this.each(function() {
                    if (this.setSelectionRange) {
                        this.setSelectionRange(begin, end);
                    } else if (this.createTextRange) {
                        range = this.createTextRange();
                        range.collapse(true);
                        range.moveEnd('character', end);
                        range.moveStart('character', begin);
                        range.select();
                    }
                });
            } else {
                if (this[0].setSelectionRange) {
                    begin = this[0].selectionStart;
                    end = this[0].selectionEnd;
                } else if (document.selection && document.selection.createRange) {
                    range = document.selection.createRange();
                    begin = 0 - range.duplicate().moveStart('character', -100000);
                    end = begin + range.text.length;
                }
                return {
                    begin: begin,
                    end: end
                };
            }
        },
        unmask: function() {
            return this.trigger("unmask");
        },
        mask: function(mask, settings) {
            var input,
                defs,
                tests,
                partialPosition,
                firstNonMaskPos,
                lastRequiredNonMaskPos,
                len,
                oldVal;

            if (!mask && this.length > 0) {
                input = $(this[0]);
                var fn = input.data($.mask.dataName)
                return fn ? fn() : undefined;
            }

            settings = $.extend({
                autoclear: $.mask.autoclear,
                placeholder: $.mask.placeholder, // Load default placeholder
                completed: null
            }, settings);


            defs = $.mask.definitions;
            tests = [];
            partialPosition = len = mask.length;
            firstNonMaskPos = null;

            mask = String(mask);

            $.each(mask.split(""), function(i, c) {
                if (c == '?') {
                    len--;
                    partialPosition = i;
                } else if (defs[c]) {
                    tests.push(new RegExp(defs[c]));
                    if (firstNonMaskPos === null) {
                        firstNonMaskPos = tests.length - 1;
                    }
                    if (i < partialPosition) {
                        lastRequiredNonMaskPos = tests.length - 1;
                    }
                } else {
                    tests.push(null);
                }
            });

            return this.trigger("unmask").each(function() {
                var input = $(this),
                    buffer = $.map(
                        mask.split(""),
                        function(c, i) {
                            if (c != '?') {
                                return defs[c] ? getPlaceholder(i) : c;
                            }
                        }),
                    defaultBuffer = buffer.join(''),
                    focusText = input.val();

                function tryFireCompleted() {
                    if (!settings.completed) {
                        return;
                    }

                    for (var i = firstNonMaskPos; i <= lastRequiredNonMaskPos; i++) {
                        if (tests[i] && buffer[i] === getPlaceholder(i)) {
                            return;
                        }
                    }
                    settings.completed.call(input);
                }

                function getPlaceholder(i) {
                    if (i < settings.placeholder.length)
                        return settings.placeholder.charAt(i);
                    return settings.placeholder.charAt(0);
                }

                function seekNext(pos) {
                    while (++pos < len && !tests[pos]);
                    return pos;
                }

                function seekPrev(pos) {
                    while (--pos >= 0 && !tests[pos]);
                    return pos;
                }

                function shiftL(begin, end) {
                    var i,
                        j;

                    if (begin < 0) {
                        return;
                    }

                    for (i = begin, j = seekNext(end); i < len; i++) {
                        if (tests[i]) {
                            if (j < len && tests[i].test(buffer[j])) {
                                buffer[i] = buffer[j];
                                buffer[j] = getPlaceholder(j);
                            } else {
                                break;
                            }

                            j = seekNext(j);
                        }
                    }
                    writeBuffer();
                    input.caret(Math.max(firstNonMaskPos, begin));
                }

                function shiftR(pos) {
                    var i,
                        c,
                        j,
                        t;

                    for (i = pos, c = getPlaceholder(pos); i < len; i++) {
                        if (tests[i]) {
                            j = seekNext(i);
                            t = buffer[i];
                            buffer[i] = c;
                            if (j < len && tests[j].test(t)) {
                                c = t;
                            } else {
                                break;
                            }
                        }
                    }
                }

                function androidInputEvent(e) {
                    var curVal = input.val();
                    var pos = input.caret();
                    if (oldVal && oldVal.length && oldVal.length > curVal.length) {
                        // a deletion or backspace happened
                        checkVal(true);
                        while (pos.begin > 0 && !tests[pos.begin - 1])
                            pos.begin--;
                        if (pos.begin === 0) {
                            while (pos.begin < firstNonMaskPos && !tests[pos.begin])
                                pos.begin++;
                        }
                        input.caret(pos.begin, pos.begin);
                    } else {
                        var pos2 = checkVal(true);
                        var lastEnteredValue = curVal.charAt(pos.begin);
                        if (pos.begin < len) {
                            if (!tests[pos.begin]) {
                                pos.begin++;
                                if (tests[pos.begin].test(lastEnteredValue)) {
                                    pos.begin++;
                                }
                            } else {
                                if (tests[pos.begin].test(lastEnteredValue)) {
                                    pos.begin++;
                                }
                            }
                        }
                        input.caret(pos.begin, pos.begin);
                    }
                    tryFireCompleted();
                }


                function blurEvent(e) {
                    checkVal();

                    if (input.val() != focusText)
                        input.change();
                }

                function keydownEvent(e) {
                    if (input.prop("readonly")) {
                        return;
                    }

                    var k = e.which || e.keyCode,
                        pos,
                        begin,
                        end;
                    oldVal = input.val();
                    //backspace, delete, and escape get special treatment
                    if (k === 8 || k === 46 || (iPhone && k === 127)) {
                        pos = input.caret();
                        begin = pos.begin;
                        end = pos.end;

                        if (end - begin === 0) {
                            begin = k !== 46 ? seekPrev(begin) : (end = seekNext(begin - 1));
                            end = k === 46 ? seekNext(end) : end;
                        }
                        clearBuffer(begin, end);
                        shiftL(begin, end - 1);

                        e.preventDefault();
                    } else if (k === 13) { // enter
                        blurEvent.call(this, e);
                    } else if (k === 27) { // escape
                        input.val(focusText);
                        input.caret(0, checkVal());
                        e.preventDefault();
                    }
                }

                function keypressEvent(e) {
                    if (input.prop("readonly")) {
                        return;
                    }

                    var k = e.which || e.keyCode,
                        pos = input.caret(),
                        p,
                        c,
                        next;

                    if (e.ctrlKey || e.altKey || e.metaKey || k < 32) { //Ignore
                        return;
                    } else if (k && k !== 13) {
                        if (pos.end - pos.begin !== 0) {
                            clearBuffer(pos.begin, pos.end);
                            shiftL(pos.begin, pos.end - 1);
                        }

                        p = seekNext(pos.begin - 1);
                        if (p < len) {
                            c = String.fromCharCode(k);
                            if (tests[p].test(c)) {
                                shiftR(p);

                                buffer[p] = c;
                                writeBuffer();
                                next = seekNext(p);

                                if (android) {
                                    //Path for CSP Violation on FireFox OS 1.1
                                    var proxy = function() {
                                        $.proxy($.fn.caret, input, next)();
                                    };

                                    setTimeout(proxy, 0);
                                } else {
                                    input.caret(next);
                                }
                                if (pos.begin <= lastRequiredNonMaskPos) {
                                    tryFireCompleted();
                                }
                            }
                        }
                        e.preventDefault();
                    }
                }

                function clearBuffer(start, end) {
                    var i;
                    for (i = start; i < end && i < len; i++) {
                        if (tests[i]) {
                            buffer[i] = getPlaceholder(i);
                        }
                    }
                }

                function writeBuffer() {
                    input.val(buffer.join(''));
                }

                function checkVal(allow) {
                    //try to place characters where they belong
                    var test = input.val(),
                        lastMatch = -1,
                        i,
                        c,
                        pos;

                    for (i = 0, pos = 0; i < len; i++) {
                        if (tests[i]) {
                            buffer[i] = getPlaceholder(i);
                            while (pos++ < test.length) {
                                c = test.charAt(pos - 1);
                                if (tests[i].test(c)) {
                                    buffer[i] = c;
                                    lastMatch = i;
                                    break;
                                }
                            }
                            if (pos > test.length) {
                                clearBuffer(i + 1, len);
                                break;
                            }
                        } else {
                            if (buffer[i] === test.charAt(pos)) {
                                pos++;
                            }
                            if (i < partialPosition) {
                                lastMatch = i;
                            }
                        }
                    }
                    if (allow) {
                        writeBuffer();
                    } else if (lastMatch + 1 < partialPosition) {
                        if (settings.autoclear || buffer.join('') === defaultBuffer) {
                            // Invalid value. Remove it and replace it with the
                            // mask, which is the default behavior.
                            if (input.val()) input.val("");
                            clearBuffer(0, len);
                        } else {
                            // Invalid value, but we opt to show the value to the
                            // user and allow them to correct their mistake.
                            writeBuffer();
                        }
                    } else {
                        writeBuffer();
                        input.val(input.val().substring(0, lastMatch + 1));
                    }
                    return (partialPosition ? i : firstNonMaskPos);
                }

                input.data($.mask.dataName, function() {
                    return $.map(buffer, function(c, i) {
                        return tests[i] && c != getPlaceholder(i) ? c : null;
                    }).join('');
                });


                input
                    .one("unmask", function() {
                        input
                            .off(".mask")
                            .removeData($.mask.dataName);
                    })
                    .on("focus.mask", function() {
                        if (input.prop("readonly")) {
                            return;
                        }

                        clearTimeout(caretTimeoutId);
                        var pos;

                        focusText = input.val();

                        pos = checkVal();

                        caretTimeoutId = setTimeout(function() {
                            if (input.get(0) !== document.activeElement) {
                                return;
                            }
                            writeBuffer();
                            if (pos == mask.replace("?", "").length) {
                                input.caret(0, pos);
                            } else {
                                input.caret(pos);
                            }
                        }, 10);
                    })
                    .on("blur.mask", blurEvent)
                    .on("keydown.mask", keydownEvent)
                    .on("keypress.mask", keypressEvent)
                    .on("input.mask paste.mask", function() {
                        if (input.prop("readonly")) {
                            return;
                        }

                        setTimeout(function() {
                            var pos = checkVal(true);
                            input.caret(pos);
                            tryFireCompleted();
                        }, 0);
                    });
                if (chrome && android) {
                    input
                        .off('input.mask')
                        .on('input.mask', androidInputEvent);
                }
                checkVal(); //Perform initial check for existing values
            });
        }
    });
}));