// ******* Expr MANAGER ******** //
$axure.internal(function($ax) {
    var _expr = $ax.expr = {};
    var _binOpHandlers = {
        '&&': function(left, right) { return _binOpOverride(left, right, function(left) { return $ax.getBool(left) && $ax.getBool(right()); }); },
        '||': function(left, right) { return _binOpOverride(left, right, function(left) { return $ax.getBool(left) || $ax.getBool(right()); }); },
        '==': function(left, right) { return isEqual(left, right, true); },
        '!=': function(left, right) { return !isEqual(left, right, true); },
        '>': function(left, right) { return _binOpNum(left, right, function(left, right) { return left > right; }); },
        '<': function(left, right) { return _binOpNum(left, right, function(left, right) { return left < right; }); },
        '>=': function(left, right) { return _binOpNum(left, right, function(left, right) { return left >= right; }); },
        '<=': function(left, right) { return _binOpNum(left, right, function(left, right) { return left <= right; }); }
    };

    var checkOps = function(left, right) {
        return left == undefined || right == undefined;
    };

    var isEqual = function (left, right, isFunction) {
        if (isFunction) {
            //if left and right is function, then get the value
            //otherwise left and right should be already the value we want
            left = left();
            right = right();
        }

        if(checkOps(left, right)) return false;

        if(left instanceof Date && right instanceof Date) {
            if(left.getMilliseconds() != right.getMilliseconds()) return false;
            if(left.getSeconds() != right.getSeconds()) return false;
            if(left.getMinutes() != right.getMinutes()) return false;
            if(left.getHours() != right.getHours()) return false;
            if(left.getDate() != right.getDate()) return false;
            if(left.getMonth() != right.getMonth()) return false;
            if(left.getYear() != right.getYear()) return false;
            return true;
        }

        if(left instanceof Object && right instanceof Object) {
            var prop;
            // Go through all of lefts properties and compare them to rights.
            for(prop in left) {
                if(!left.hasOwnProperty(prop)) continue;
                // If left has a property that the right doesn't they are not equal.
                if(!right.hasOwnProperty(prop)) return false;
                // If any of their properties are not equal, they are not equal.
                if(!isEqual(left[prop], right[prop], false)) return false;
            }

            for(prop in right) {
                // final check to make sure right doesn't have some extra properties that make them not equal.
                if(left.hasOwnProperty(prop) != right.hasOwnProperty(prop)) return false;
            }

            return true;
        }
        return $ax.getBool(left) == $ax.getBool(right);
    };

    var _binOpOverride = function(left, right, func) {
        left = left();
        if(left == undefined) return false;
        var res = func(left, right);
        return res == undefined ? false : res;
    };

    var _binOpNum = function(left, right, func) {
        var left = left();
        var right = right();
        if(checkOps(left, right)) return false;

        return func(left, Number(right));
    };

    var _exprHandlers = {};
    _exprHandlers.array = function(expr, eventInfo) {
        var returnVal = [];
        for(var i = 0; i < expr.items.length; i++) {
            returnVal[returnVal.length] = _evaluateExpr(expr.items[i], eventInfo);
        }
        return returnVal;
    };

    _exprHandlers.binaryOp = function(expr, eventInfo) {
        var left = function() { return expr.leftExpr && _evaluateExpr(expr.leftExpr, eventInfo); };
        var right = function() { return expr.rightExpr && _evaluateExpr(expr.rightExpr, eventInfo); };

        if(left == undefined || right == undefined) return false;
        return _binOpHandlers[expr.op](left, right);
    };

    _exprHandlers.block = function(expr, eventInfo) {
        var subExprs = expr.subExprs;
        for(var i = 0; i < subExprs.length; i++) {
            _evaluateExpr(subExprs[i], eventInfo); //ignore the result
        }
    };

    _exprHandlers.booleanLiteral = function(expr) {
        return expr.value;
    };

    _exprHandlers.nullLiteral = function() { return null; };

    _exprHandlers.pathLiteral = function(expr, eventInfo) {
        if(expr.isThis) return [eventInfo.srcElement];
        if(expr.isFocused && window.lastFocusedControl) {
            $ax('#' + window.lastFocusedControl).focus();
            return [window.lastFocusedControl];
        }
        if(expr.isTarget) return [eventInfo.targetElement];

        return $ax.getElementIdsFromPath(expr.value, eventInfo);
    };

    _exprHandlers.panelDiagramLiteral = function(expr, eventInfo) {
        var elementIds = $ax.getElementIdsFromPath(expr.panelPath, eventInfo);
        var elementIdsWithSuffix = [];
        var suffix = '_state' + expr.panelIndex;
        for(var i = 0; i < elementIds.length; i++) {
            elementIdsWithSuffix[i] = $ax.repeater.applySuffixToElementId(elementIds[i], suffix);
        }
        return String($jobj(elementIdsWithSuffix).data('label'));
    };

    _exprHandlers.fcall = function(expr, eventInfo) {
        var oldTarget = eventInfo.targetElement;
        var targets = [];
        var fcallArgs = [];
        var exprArgs = expr.arguments;
        for(var i = 0; i < expr.arguments.length; i++) {
            var exprArg = exprArgs[i];
            var fcallArg = '';
            if(targets.length) {
                for(var j = 0; j < targets.length; j++) {
                    if(exprArg == null) {
                        fcallArgs[j][i] = null;
                        continue;
                    }
                    eventInfo.targetElement = targets[j];
                    fcallArg = _evaluateExpr(exprArg, eventInfo);
                    if(typeof (fcallArg) == 'undefined') return '';
                    fcallArgs[j][i] = fcallArg;
                }
            } else {
                if(exprArg == null) {
                    fcallArgs[i] = null;
                    continue;
                }
                fcallArg = _evaluateExpr(exprArg, eventInfo);
                if(typeof (fcallArg) == 'undefined') return '';
                fcallArgs[i] = fcallArg;
            }

            // We do support null exprArgs...
            // TODO: This makes 2 assumptions that may change in the future. 1. The pathLiteral is the always the first arg. 2. there is always only 1 pathLiteral
            if(exprArg && exprArg.exprType == 'pathLiteral') {
                targets = fcallArg;

                // fcallArgs is now an array of an array of args
                for(j = 0; j < targets.length; j++) fcallArgs[j] = [[fcallArg[j]]];
            }
        }

        // we want to preserve the target element from outside this function.
        eventInfo.targetElement = oldTarget;

        var retval = '';
        if(targets.length) {
            // Go backwards so retval is the first item.
            for(i = targets.length - 1; i >= 0; i--) {
                var args = fcallArgs[i];
                // Add event info to the end
                args[args.length] = eventInfo;
                retval = _exprFunctions[expr.functionName].apply(this, args);
            }
        } else fcallArgs[fcallArgs.length] = eventInfo;
        return targets.length ? retval : _exprFunctions[expr.functionName].apply(this, fcallArgs);
    };

    _exprHandlers.globalVariableLiteral = function(expr) {
        return expr.variableName;
    };

    _exprHandlers.keyPressLiteral = function(expr) {
        var keyInfo = {};
        keyInfo.keyCode = expr.keyCode;
        keyInfo.ctrl = expr.ctrl;
        keyInfo.alt = expr.alt;
        keyInfo.shift = expr.shift;

        return keyInfo;
    };

    _exprHandlers.adaptiveViewLiteral = function(expr) {
        return expr.id;
    };

    _exprHandlers.optionLiteral = function(expr) {
        return expr.value;
    }

    var _substituteSTOs = function(expr, eventInfo) {
        //first evaluate the local variables
        var scope = {};
        for(var varName in expr.localVariables) {
            scope[varName] = $ax.expr.evaluateExpr(expr.localVariables[varName], eventInfo);
        }

        // TODO: [ben] Date and data object (obj with info for url or image) both need to return non-strings.
        var i = 0;
        var retval;
        var retvalString = expr.value.replace(/\[\[(?!\[)(.*?)\]\](?=\]*)/g, function(match) {
            var sto = expr.stos[i++];
            if(sto.sto == 'error') return match;
            try {
                var result = $ax.evaluateSTO(sto, scope, eventInfo);
            } catch(e) {
                return match;
            }

            if((result instanceof Object) && i == 1 && expr.value.substring(0, 2) == '[[' &&
                expr.value.substring(expr.value.length - 2) == ']]') {
                // If the result was an object, this was the first result, and the whole thing was this expresion.
                retval = result;
            }
            return ((result instanceof Object) && (result.label || result.text)) || result;
        });
        // If more than one group returned, the object is not valid
        if(i != 1) retval = false;
        return retval || retvalString;
    };

    _exprHandlers.htmlLiteral = function (expr, eventInfo) {
        eventInfo.htmlLiteral = true;
        var html = _substituteSTOs(expr, eventInfo);
        eventInfo.htmlLiteral = false
        return html;
    };

    _exprHandlers.stringLiteral = function(expr, eventInfo) {
        return _substituteSTOs(expr, eventInfo);
    };

    var _exprFunctions = {};

    _exprFunctions.ToLowerCase = function (value) {
        let str = _exprFunctions.ToString(value);
        return str.toLowerCase();
    };

    _exprFunctions.SetErrorState = function (elementIds, value) {
        var toggle = value == 'toggle';
        var boolValue = Boolean(value) && value != 'false';

        for(var i = 0; i < elementIds.length; i++) {
            var query = $ax('#' + elementIds[i]);
            query.error(toggle ? !query.error() : boolValue);
        }
    };

    _exprFunctions.SetCheckState = function(elementIds, value) {
        var toggle = value == 'toggle';
        var boolValue = Boolean(value) && value != 'false';

        for(var i = 0; i < elementIds.length; i++) {
            var query = $ax('#' + elementIds[i]);
            query.selected(toggle ? !query.selected() : boolValue);
        }
    };

    _exprFunctions.SetSelectedOption = function(elementIds, value) {
        for(var i = 0; i < elementIds.length; i++) {
            var elementId = elementIds[i];
            var obj = $jobj($ax.INPUT(elementId));

            if(obj.val() == value) return;
            obj.val(value);

            if($ax.event.HasSelectionChanged($ax.getObjectFromElementId(elementId))) $ax.event.raiseSyntheticEvent(elementId, 'onSelectionChange');
        }
    };

    _exprFunctions.SetGlobalVariableValue = function(varName, value) {
        $ax.globalVariableProvider.setVariableValue(varName, value);
    };

    _exprFunctions.SetWidgetFormText = function(elementIds, value) {
        for(var i = 0; i < elementIds.length; i++) {
            var elementId = elementIds[i];
            var inputId = $ax.repeater.applySuffixToElementId(elementId, '_input');

            var obj = $jobj(inputId);
            if(obj.val() == value || (value == '' && $ax.placeholderManager.isActive(elementId))) return;
            obj.val(value);
            $ax.placeholderManager.updatePlaceholder(elementId, !value);
            if($ax.event.HasTextChanged($ax.getObjectFromElementId(elementId))) $ax.event.TryFireTextChanged(elementId);
        }
    };

    _exprFunctions.SetFocusedWidgetText = function(elementId, value) {
        if(window.lastFocusedControl) {
            var elementId = window.lastFocusedControl;
            var type = $obj(elementId).type;
            if ($ax.public.fn.IsTextBox(type) || $ax.public.fn.IsTextArea(type)) _exprFunctions.SetWidgetFormText([elementId], value);
            else _exprFunctions.SetWidgetRichText([elementId], value, true);
        }
    };

    _exprFunctions.GetRtfElementHeight = function(rtfElement) {
        if(rtfElement.innerHTML == '') rtfElement.innerHTML = '&nbsp;';
        return rtfElement.offsetHeight;
    };

    _exprFunctions.SetWidgetRichText = function(ids, value, plain) {
        // Converts dates, widgetinfo, and the like to strings.
        value = _exprFunctions.ToString(value);

        //Replace any newlines with line breaks
        var finalValue = value.replace(/\r\n/g, '<br>').replace(/\n/g, '<br>');

        for(var i = 0; i < ids.length; i++) {
            var id = ids[i];

            // If calling this on button shape, get the id of the rich text panel inside instead
            if($obj(id).type !== $ax.constants.LINK_TYPE) id = $ax.GetTextPanelId(id, true);

            var element = window.document.getElementById(id);
            $ax.visibility.SetVisible(element, value != '');

            $ax.style.transformTextWithVerticalAlignment(id, function() {
                var spans = $jobj(id).find('span');
                if(plain) {
                    // Can't set value as text because '<br/>' doesn't actually do a line break
                    // Can't set vaule as html because it doesn't like '<' and ignores all after it
                    // Create tags yourself
                    var lines = value.split(/\r\n|\n/);
                    //if we are dealing with only one line, just reuse the old one
                    if(spans.length === 1 && lines.length === 1) {
                        $(spans[0]).text(value);
                        return;
                    }

                    // Wrap in span and p, style them accordingly.
                    var span = $('<span></span>');
                    if(spans.length > 0) {
                        span.attr('style', $(spans[0]).attr('style'));
                        span.attr('id', $(spans[0]).attr('id'));
                    }

                    if(lines.length == 1) span.text(value);
                    else {
                        for(var i = 0; i < lines.length; i++) {
                            if(i != 0) span.append($('<br />'));
                            var line = lines[i];
                            if(line.length == 0) continue;

                            var subSpan = $('<span />');
                            subSpan.text(line);
                            span.append(subSpan);
                        }
                    }

                    var ps = $jobj(id).find('p');
                    if(ps && ps.length) {
                        ps[0].innerHTML = $('<div></div>').append(span).html();;
                        if(ps.length > 1) {
                            for(var i = 1; i < ps.length; i++) {
                                $(ps[i]).remove();
                            }
                        }
                    } else {
                        var p = $('<p></p>');
                        p.append(span);
                        element.innerHTML = $('<div></div>').append(p).html();
                    }
                } else element.innerHTML = finalValue;
            });

            if(!plain) $ax.style.CacheOriginalText(id, true);

            autofitWidget(ids[i]);
        }
    };

    var _autoFitIds = $ax.expr.autoFitIds = {};

    _setAutoFitId = $ax.expr.setAutoFitId = function (scriptId, css) {
        _autoFitIds[scriptId] = css;
    };

    $ax.expr.clearAutoFittedIds = function (elementIds) {
        for (var i = 0; i < elementIds.length; i++) {
            var id = elementIds[i];
            delete _autoFitIds[id];
        }
    };

    $ax.expr.updateAutoFitted = function () {
        for (var id  in _autoFitIds) {
            autofitWidget(id);
        }
    }

    var _needsDisplay = function (id) {
        var parent = document.getElementById(id);
        while (parent) {
            if (parent.style.display == 'none') return true;
            parent = parent.parentElement;
        }
        return false;
    };

    var _getMeasureContainer = function () {
        var $container = $jobj("measure");
        if ($container.length == 0) {
            $container = $("<div id='measure' style='position: absolute; width:0px; height:0px'></div>");
            $("body").append($container);
        }
        return $container;
    };

    var _displayWidgetIfNeeded = function(id) {        
        var jobj = $jobj(id);
        var needsDisplay = _needsDisplay(id);
        if(!needsDisplay) return {
            jObject: jobj,
            trap: undefined
        };

        var $container = _getMeasureContainer();
        jobj = jobj.clone();
        $container.append(jobj);
        jobj.css('display', 'block');
        
        return {
            jObject: jobj,
            trap: function() {
                jobj.remove();
            }
        };
    }
    $ax.expr.displayWidgetIfNeeded = _displayWidgetIfNeeded;


    var _displayWidgetAndParents = function(id) {
        var parents = $ax('#' + id).getParents(true, '*')[0];
        parents.push(id); // also need to show self

        var displayed = [];
        for(var i = 0; i < parents.length; i++) {
            var currId = parents[i];
            var currObj = $jobj(currId);
            if(currObj.css('display') == 'none') {
                currObj.css('display', 'block');
                displayed.push(currId);
            }
        }

        return function() {
            for(var i = 0; i < displayed.length; i++) {
                $jobj(displayed[i]).css('display', 'none');
            }
        };
    }
    $ax.expr.displayWidgetAndParents = _displayWidgetAndParents;

    var autofitWidget = function (id) {

        var obj = $obj(id);
        if (obj.autoFitHeight || obj.autoFitWidth) {

            var values = _displayWidgetIfNeeded(id);
            var jobj = values.jObject;
            var trap = values.trap;

            var query = $ax('#' + id);
            var size = query.size();
            var css = {
                width: size.width,
                height: size.height
            };

            var textId = $ax.GetTextPanelId(id, true);
            var style = $ax.style.computeFullStyle(id, $ax.style.generateState(id), $ax.adaptive.currentViewId);

            if (obj.autoFitHeight) {
                var jText = jobj.children('#' + textId);
                var newHeight = jText.height();
                if (style.paddingTop) newHeight += Number(style.paddingTop);
                if (style.paddingBottom) newHeight += Number(style.paddingBottom);

                if (newHeight - size.height != 0) {
                    css.height = newHeight;
                }
            };

            if (obj.autoFitWidth) {
                var pars = jobj.find('p');
                var newWidth = 0;

                for (var j = 0; j < pars.length; ++j) {
                    var spans = $(pars[j]).children('span');
                    var w = 0;
                    for (var i = 0; i < spans.length; ++i) {
                        w += $(spans[i]).width();
                    }
                    if (w > newWidth) newWidth = w;
                }

                if (style.paddingLeft) newWidth += Number(style.paddingLeft);
                if (style.paddingRight) newWidth += Number(style.paddingRight);

                if (newWidth - size.width != 0) {
                    css.width = newWidth;
                }
            };

            const deltaWidth = css.width - size.width;
            const deltaHeight = css.height - size.height;

            if (deltaWidth !== 0 || deltaHeight !== 0) {
                query.resize(css, {});

                const hAlign = style.horizontalAlignment;
                const vAlign = style.verticalAlignment;
                let dx = 0;
                let dy = 0;

                if (hAlign === "right") {
                    dx = -deltaWidth;
                } else if (hAlign === "center") {
                    dx = -deltaWidth / 2;
                }

                if (vAlign === "bottom") {
                    dy = -deltaHeight;
                } else if (vAlign === "middle") {
                    dy = -deltaHeight / 2;
                }

                if (dx !== 0 || dy !== 0) {
                    $ax.move.MoveWidget(id, dx, dy, { easing: 'none', duration: 0 }, false, null, true);
                }
            }

            if(trap) trap();

            _setAutoFitId(id, css);
        }
    }

    _exprFunctions.GetCheckState = function(ids) {
        return $ax('#' + ids[0]).selected();
    };

    _exprFunctions.GetDisabledState = function (ids) {
        return !$ax('#' + ids[0]).enabled();
    };

    _exprFunctions.GetSelectedOption = function (ids) {
        var inputs = $jobj($ax.INPUT(ids[0]));
        return inputs.length ? inputs[0].value : '';
    };

    _exprFunctions.GetErrorState = function (ids) {
        return $ax('#' + ids[0]).error();
    };

    _exprFunctions.GetNum = function(str) {
        //Setting a GlobalVariable to some blank text then setting a widget to the value of that variable would result in 0 not ""
        //I have fixed this another way so commenting this should be fine now
        //if (!str) return "";
        return isNaN(str) ? str : Number(str);
    };

    _exprFunctions.GetGlobalVariableValue = function(id) {
        return $ax.globalVariableProvider.getVariableValue(id);
    };

    _exprFunctions.GetGlobalVariableLength = function(id) {
        return _exprFunctions.GetGlobalVariableValue(id).length;
    };

    _exprFunctions.GetWidgetText = function(ids) {
        if($ax.placeholderManager.isActive(ids[0])) return '';
        var input = $ax.INPUT(ids[0]);
        return $ax('#' + ($jobj(input).length ? input : ids[0])).text();
    };

    _exprFunctions.GetFocusedWidgetText = function() {
        if(window.lastFocusedControl) {
            return $ax('#' + window.lastFocusedControl).text();
        } else {
            return "";
        }
    };

    _exprFunctions.GetWidgetValueLength = function(ids) {
        var id = ids[0];
        if(!id) return undefined;
        if($ax.placeholderManager.isActive(id)) return 0;
        var obj = $jobj($ax.INPUT(id));
        if(!obj.length) obj = $jobj(id);
        var val = obj[0].value || _exprFunctions.GetWidgetText([id]);
        return val.length;
    };

    _exprFunctions.GetPanelState = function(ids) {
        var id = ids[0];
        if(!id) return undefined;
        var stateId = $ax.visibility.GetPanelState(id);
        return stateId && String($jobj(stateId).data('label'));
    };

    _exprFunctions.GetWidgetVisibility = function(ids) {
        var id = ids[0];
        if(!id) return undefined;
        return $ax.visibility.IsIdVisible(id);
    };

    // *****************  Validation Functions ***************** //

    _exprFunctions.IsValueAlpha = function(val) {
        var isAlphaRegex = new RegExp("^[a-z\\s]+$", "gi");
        return isAlphaRegex.test(val);
    };

    _exprFunctions.IsValueNumeric = function(val) {
        var isNumericRegex = new RegExp("^[0-9,\\.\\s]+$", "gi");
        return isNumericRegex.test(val);
    };

    _exprFunctions.IsValueAlphaNumeric = function(val) {
        var isAlphaNumericRegex = new RegExp("^[0-9a-z\\s]+$", "gi");
        return isAlphaNumericRegex.test(val);
    };

    _exprFunctions.IsValueOneOf = function(val, values) {
        for(var i = 0; i < values.length; i++) {
            var option = values[i];
            if(val == option) return true;
        }
        //by default, return false
        return false;
    };

    _exprFunctions.IsValueNotAlpha = function(val) {
        return !_exprFunctions.IsValueAlpha(val);
    };

    _exprFunctions.IsValueNotNumeric = function(val) {
        return !_exprFunctions.IsValueNumeric(val);
    };

    _exprFunctions.IsValueNotAlphaNumeric = function(val) {
        return !_exprFunctions.IsValueAlphaNumeric(val);
    };

    _exprFunctions.IsValueNotOneOf = function(val, values) {
        return !_exprFunctions.IsValueOneOf(val, values);
    };

    _exprFunctions.GetKeyPressed = function(eventInfo) {
        return eventInfo.keyInfo;
    };

    _exprFunctions.GetCursorRectangles = function() {
        var rects = new Object();
        rects.lastRect = new $ax.drag.Rectangle($ax.lastMouseLocation.x, $ax.lastMouseLocation.y, 1, 1);
        rects.currentRect = new $ax.drag.Rectangle($ax.mouseLocation.x, $ax.mouseLocation.y, 1, 1);
        return rects;
    };

    _exprFunctions.GetWidgetRectangles = function (elementIds, eventInfo) {
        var elementId = elementIds[0];
        var rects = new Object();
        var jObj = $jobj(elementId);
        var invalid = jObj.length == 0;
        var parent = jObj;
        // Or are in valid if no obj can be found, or if it is not visible.
        while(parent.length != 0 && !parent.is('body')) {
            if(parent.css('display') == 'none') {
                invalid = true;
                break;
            }
            parent = parent.parent();
        }
        if(invalid) {
            rects.lastRect = rects.currentRect = new $ax.drag.Rectangle(-1, -1, -1, -1);
            return rects;
        }

        var axObj = $ax('#' + elementId);
        var boundingRect = axObj.viewportBoundingRect();
        rects.lastRect = new $ax.drag.Rectangle(
            boundingRect.left,
            boundingRect.top,
            boundingRect.width,
            boundingRect.height);
        //rects.lastRect = new $ax.drag.Rectangle(
        //        axObj.left(),
        //        axObj.top(),
        //        axObj.width(),
        //        axObj.height());

        rects.currentRect = rects.lastRect;
        return rects;
    };

    _exprFunctions.GetWidget = function(elementId) {
        return $ax.getWidgetInfo(elementId[0]);
    };

    _exprFunctions.GetAdaptiveView = function (eventInfo) {
        if (eventInfo && eventInfo.srcElement) {
            var id = eventInfo.srcElement;
            var diagramObject = $ax.getObjectFromElementId(id);
            if (diagramObject.owner.type == 'Axure:Master' || diagramObject.owner.type == 'referenceDiagramObject') {
                var viewIdChain = $ax.style.getViewIdChain($ax.adaptive.currentViewId || '', id, diagramObject);
                if (viewIdChain.length > 0) return viewIdChain[viewIdChain.length - 1];
                else return '19e82109f102476f933582835c373474';
            }
        }
        return $ax.adaptive.currentViewId || '';
    };

    _exprFunctions.IsEntering = function(movingRects, targetRects) {
        return !movingRects.lastRect.IntersectsWith(targetRects.currentRect) && movingRects.currentRect.IntersectsWith(targetRects.currentRect);
    };

    _exprFunctions.IsLeaving = function(movingRects, targetRects) {
        return movingRects.lastRect.IntersectsWith(targetRects.currentRect) && !movingRects.currentRect.IntersectsWith(targetRects.currentRect);
    };

    var _IsOver = _exprFunctions.IsOver = function(movingRects, targetRects) {
        return movingRects.currentRect.IntersectsWith(targetRects.currentRect);
    };

    _exprFunctions.IsNotOver = function(movingRects, targetRects) {
        return !_IsOver(movingRects, targetRects);
    };

    _exprFunctions.ValueContains = function(inputString, value) {
        return inputString.indexOf(value) > -1;
    };

    _exprFunctions.ValueNotContains = function(inputString, value) {
        return !_exprFunctions.ValueContains(inputString, value);
    };

    _exprFunctions.ToString = function(value) {
        if(value.isWidget) {
            return value.text;
        }
        return String(value);
    };

    var _evaluateExpr = $ax.expr.evaluateExpr = function(expr, eventInfo, toString) {
        if(expr === undefined || expr === null) return undefined;
        var result = _exprHandlers[expr.exprType](expr, eventInfo);
        return toString ? _exprFunctions.ToString(result) : result;
    };


});