player/js/utils/expressions/ExpressionManager.js

var ExpressionManager = (function(){
    'use strict';
    var ob = {};
    var Math = BMMath;
    var window = null;
    var document = null;

    function $bm_isInstanceOfArray(arr) {
        return arr.constructor === Array || arr.constructor === Float32Array;
    }

    function isNumerable(tOfV, v) {
        return tOfV === 'number' || tOfV === 'boolean' || tOfV === 'string' || v instanceof Number;
    }

    function $bm_neg(a){
        var tOfA = typeof a;
        if(tOfA === 'number' || tOfA === 'boolean'  || a instanceof Number ){
            return -a;
        }
        if($bm_isInstanceOfArray(a)){
            var i, lenA = a.length;
            var retArr = [];
            for(i=0;i<lenA;i+=1){
                retArr[i] = -a[i];
            }
            return retArr;
        }
    }

    var easeInBez = BezierFactory.getBezierEasing(0.333,0,.833,.833, 'easeIn').get;
    var easeOutBez = BezierFactory.getBezierEasing(0.167,0.167,.667,1, 'easeOut').get;
    var easeInOutBez = BezierFactory.getBezierEasing(.33,0,.667,1, 'easeInOut').get;

    function sum(a,b) {
        var tOfA = typeof a;
        var tOfB = typeof b;
        if(tOfA === 'string' || tOfB === 'string'){
            return a + b;
        }
        if(isNumerable(tOfA, a) && isNumerable(tOfB, b)) {
            return a + b;
        }
        if($bm_isInstanceOfArray(a) && isNumerable(tOfB, b)){
            a = a.slice(0);
            a[0] = a[0] + b;
            return a;
        }
        if(isNumerable(tOfA, a) && $bm_isInstanceOfArray(b)){
            b = b.slice(0);
            b[0] = a + b[0];
            return b;
        }
        if($bm_isInstanceOfArray(a) && $bm_isInstanceOfArray(b)){
            
            var i = 0, lenA = a.length, lenB = b.length;
            var retArr = [];
            while(i<lenA || i < lenB){
                if((typeof a[i] === 'number' || a[i] instanceof Number) && (typeof b[i] === 'number' || b[i] instanceof Number)){
                    retArr[i] = a[i] + b[i];
                }else{
                    retArr[i] = b[i] === undefined ? a[i] : a[i] || b[i];
                }
                i += 1;
            }
            return retArr;
        }
        return 0;
    }
    var add = sum;

    function sub(a,b) {
        var tOfA = typeof a;
        var tOfB = typeof b;
        if(isNumerable(tOfA, a) && isNumerable(tOfB, b)) {
            if(tOfA === 'string') {
                a = parseInt(a);
            }
            if(tOfB === 'string') {
                b = parseInt(b);
            }
            return a - b;
        }
        if( $bm_isInstanceOfArray(a) && isNumerable(tOfB, b)){
            a = a.slice(0);
            a[0] = a[0] - b;
            return a;
        }
        if(isNumerable(tOfA, a) &&  $bm_isInstanceOfArray(b)){
            b = b.slice(0);
            b[0] = a - b[0];
            return b;
        }
        if($bm_isInstanceOfArray(a) && $bm_isInstanceOfArray(b)){
            var i = 0, lenA = a.length, lenB = b.length;
            var retArr = [];
            while(i<lenA || i < lenB){
                if((typeof a[i] === 'number' || a[i] instanceof Number) && (typeof b[i] === 'number' || b[i] instanceof Number)){
                    retArr[i] = a[i] - b[i];
                }else{
                    retArr[i] = b[i] === undefined ? a[i] : a[i] || b[i];
                }
                i += 1;
            }
            return retArr;
        }
        return 0;
    }

    function mul(a,b) {
        var tOfA = typeof a;
        var tOfB = typeof b;
        var arr;
        if(isNumerable(tOfA, a) && isNumerable(tOfB, b)) {
            return a * b;
        }

        var i, len;
        if($bm_isInstanceOfArray(a) && isNumerable(tOfB, b)){
            len = a.length;
            arr = createTypedArray('float32', len);
            for(i=0;i<len;i+=1){
                arr[i] = a[i] * b;
            }
            return arr;
        }
        if(isNumerable(tOfA, a) && $bm_isInstanceOfArray(b)){
            len = b.length;
            arr = createTypedArray('float32', len);
            for(i=0;i<len;i+=1){
                arr[i] = a * b[i];
            }
            return arr;
        }
        return 0;
    }

    function div(a,b) {
        var tOfA = typeof a;
        var tOfB = typeof b;
        var arr;
        if(isNumerable(tOfA, a) && isNumerable(tOfB, b)) {
            return a / b;
        }
        var i, len;
        if($bm_isInstanceOfArray(a) && isNumerable(tOfB, b)){
            len = a.length;
            arr = createTypedArray('float32', len);
            for(i=0;i<len;i+=1){
                arr[i] = a[i] / b;
            }
            return arr;
        }
        if(isNumerable(tOfA, a) && $bm_isInstanceOfArray(b)){
            len = b.length;
            arr = createTypedArray('float32', len);
            for(i=0;i<len;i+=1){
                arr[i] = a / b[i];
            }
            return arr;
        }
        return 0;
    }
    function mod(a,b) {
        if(typeof a === 'string') {
            a = parseInt(a);
        }
        if(typeof b === 'string') {
            b = parseInt(b);
        }
        return a % b;
    }

    function clamp(num, min, max) {
        if(min > max){
            var mm = max;
            max = min;
            min = mm;
        }
        return Math.min(Math.max(num, min), max);
    }

    function radiansToDegrees(val) {
        return val/degToRads;
    }
    var radians_to_degrees = radiansToDegrees;

    function degreesToRadians(val) {
        return val*degToRads;
    }
    var degrees_to_radians = radiansToDegrees;

    var helperLengthArray = [0,0,0,0,0,0];

    function length(arr1, arr2) {
        if (typeof arr1 === 'number' || arr1 instanceof Number) {
            arr2 = arr2 || 0;
            return Math.abs(arr1 - arr2);
        }
        if(!arr2) {
            arr2 = helperLengthArray;
        }
        var i, len = Math.min(arr1.length, arr2.length);
        var addedLength = 0;
        for (i = 0; i < len; i += 1) {
            addedLength += Math.pow(arr2[i] - arr1[i], 2);
        }
        return Math.sqrt(addedLength);
    }

    function normalize(vec) {
        return div(vec, length(vec));
    }

    function rgbToHsl(val) {
        var r = val[0]; var g = val[1]; var b = val[2];
        var max = Math.max(r, g, b), min = Math.min(r, g, b);
        var h, s, l = (max + min) / 2;

        if(max == min){
            h = s = 0; // achromatic
        }else{
            var d = max - min;
            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
            switch(max){
                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
                case g: h = (b - r) / d + 2; break;
                case b: h = (r - g) / d + 4; break;
            }
            h /= 6;
        }

        return [h, s, l,val[3]];
    }

    function hue2rgb(p, q, t){
        if(t < 0) t += 1;
        if(t > 1) t -= 1;
        if(t < 1/6) return p + (q - p) * 6 * t;
        if(t < 1/2) return q;
        if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
        return p;
    }

    function hslToRgb(val){
        var h = val[0];
        var s = val[1];
        var l = val[2];

        var r, g, b;

        if(s === 0){
            r = g = b = l; // achromatic
        }else{

            var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
            var p = 2 * l - q;
            r = hue2rgb(p, q, h + 1/3);
            g = hue2rgb(p, q, h);
            b = hue2rgb(p, q, h - 1/3);
        }

        return [r, g , b, val[3]];
    }

    function linear(t, tMin, tMax, value1, value2){
        if(value1 === undefined || value2 === undefined){
            value1 = tMin;
            value2 = tMax;
            tMin = 0;
            tMax = 1;
        }
        if(tMax < tMin) {
            var _tMin = tMax;
            tMax = tMin;
            tMin = _tMin;
        }
        if(t <= tMin) {
            return value1;
        }else if(t >= tMax){
            return value2;
        }
        var perc = tMax === tMin ? 0 : (t-tMin)/(tMax-tMin);
        if(!value1.length){
            return value1 + (value2-value1)*perc;
        }
        var i, len = value1.length;
        var arr = createTypedArray('float32', len);
        for(i=0;i<len;i+=1){
            arr[i] = value1[i] + (value2[i]-value1[i])*perc;
        }
        return arr;
    }
    function random(min,max){
        if(max === undefined){
            if(min === undefined){
                min = 0;
                max = 1;
            } else {
                max = min;
                min = undefined;
            }
        }
        if(max.length){
            var i, len = max.length;
            if(!min){
                min = createTypedArray('float32', len);
            }
            var arr = createTypedArray('float32', len);
            var rnd = BMMath.random();
            for(i=0;i<len;i+=1){
                arr[i] = min[i] + rnd*(max[i]-min[i]);
            }
            return arr;
        }
        if(min === undefined){
            min = 0;
        }
        var rndm = BMMath.random();
        return min + rndm*(max-min);
    }

    function createPath(points, inTangents, outTangents, closed) {
        var i, len = points.length;
        var path = shape_pool.newElement();
        path.setPathData(!!closed, len);
        var arrPlaceholder = [0,0], inVertexPoint, outVertexPoint;
        for(i = 0; i < len; i += 1) {
            inVertexPoint = (inTangents && inTangents[i]) ? inTangents[i] : arrPlaceholder;
            outVertexPoint = (outTangents && outTangents[i]) ? outTangents[i] : arrPlaceholder;
            path.setTripleAt(points[i][0],points[i][1],outVertexPoint[0] + points[i][0],outVertexPoint[1] + points[i][1],inVertexPoint[0] + points[i][0],inVertexPoint[1] + points[i][1],i,true);
        }
        return path;
    }

    function initiateExpression(elem,data,property){
        var val = data.x;
        var needsVelocity = /velocity(?![\w\d])/.test(val);
        var _needsRandom = val.indexOf('random') !== -1;
        var elemType = elem.data.ty;
        var transform,$bm_transform,content,effect;
        var thisProperty = property;
        thisProperty.valueAtTime = thisProperty.getValueAtTime;
        elem.comp.frameDuration = 1/elem.comp.globalData.frameRate;
        var inPoint = elem.data.ip/elem.comp.globalData.frameRate;
        var outPoint = elem.data.op/elem.comp.globalData.frameRate;
        var width = elem.data.sw ? elem.data.sw : 0;
        var height = elem.data.sh ? elem.data.sh : 0;
        var name = elem.data.nm;
        var loopIn, loop_in, loopOut, loop_out;
        var toWorld,fromWorld,fromComp,toComp,fromCompToSurface, position, rotation, anchorPoint, scale, thisLayer,thisComp,mask,valueAtTime,velocityAtTime;
        var __expression_functions = [];
        if(data.xf) {
            var i, len = data.xf.length;
            for(i = 0; i < len; i += 1) {
                __expression_functions[i] = eval('(function(){ return ' + data.xf[i] + '}())');
            }
        }

        var scoped_bm_rt;
        var expression_function = eval('[function _expression_function(){' + val+';scoped_bm_rt=$bm_rt}' + ']')[0];
        var numKeys = property.kf ? data.k.length : 0;

        var active = !this.data || this.data.hd !== true;

        var wiggle = function wiggle(freq,amp){
            var i,j, len = this.pv.length ? this.pv.length : 1;
            var addedAmps = createTypedArray('float32', len);
            freq = 5;
            var iterations = Math.floor(time*freq);
            i = 0;
            j = 0;
            while(i<iterations){
                //var rnd = BMMath.random();
                for(j=0;j<len;j+=1){
                    addedAmps[j] += -amp + amp*2*BMMath.random();
                    //addedAmps[j] += -amp + amp*2*rnd;
                }
                i += 1;
            }
            //var rnd2 = BMMath.random();
            var periods = time*freq;
            var perc = periods - Math.floor(periods);
            var arr = createTypedArray('float32', len);
            if(len>1){
                for(j=0;j<len;j+=1){
                    arr[j] = this.pv[j] + addedAmps[j] + (-amp + amp*2*BMMath.random())*perc;
                    //arr[j] = this.pv[j] + addedAmps[j] + (-amp + amp*2*rnd)*perc;
                    //arr[i] = this.pv[i] + addedAmp + amp1*perc + amp2*(1-perc);
                }
                return arr;
            } else {
                return this.pv + addedAmps[0] + (-amp + amp*2*BMMath.random())*perc;
            }
        }.bind(this);

        if(thisProperty.loopIn) {
            loopIn = thisProperty.loopIn.bind(thisProperty);
            loop_in = loopIn;
        }

        if(thisProperty.loopOut) {
            loopOut = thisProperty.loopOut.bind(thisProperty);
            loop_out = loopOut;
        }

        function loopInDuration(type,duration){
            return loopIn(type,duration,true);
        }

        function loopOutDuration(type,duration){
            return loopOut(type,duration,true);
        }

        if(this.getValueAtTime) {
            valueAtTime = this.getValueAtTime.bind(this);
        }

        if(this.getVelocityAtTime) {
            velocityAtTime = this.getVelocityAtTime.bind(this);
        }

        var comp = elem.comp.globalData.projectInterface.bind(elem.comp.globalData.projectInterface);

        function lookAt(elem1,elem2){
            var fVec = [elem2[0]-elem1[0],elem2[1]-elem1[1],elem2[2]-elem1[2]];
            var pitch = Math.atan2(fVec[0],Math.sqrt(fVec[1]*fVec[1]+fVec[2]*fVec[2]))/degToRads;
            var yaw = -Math.atan2(fVec[1],fVec[2])/degToRads;
            return [yaw,pitch,0];
        }

        function easeOut(t, tMin, tMax, val1, val2){
            return applyEase(easeOutBez, t, tMin, tMax, val1, val2);
        }

        function easeIn(t, tMin, tMax, val1, val2){
            return applyEase(easeInBez, t, tMin, tMax, val1, val2);
        }

        function ease(t, tMin, tMax, val1, val2){
            return applyEase(easeInOutBez, t, tMin, tMax, val1, val2);
        }

        function applyEase(fn, t, tMin, tMax, val1, val2) {
            if(val1 === undefined){
                val1 = tMin;
                val2 = tMax;
            } else {
                t = (t - tMin) / (tMax - tMin);
            }
            t = t > 1 ? 1 : t < 0 ? 0 : t;
            var mult = fn(t);
            if($bm_isInstanceOfArray(val1)) {
                var i, len = val1.length;
                var arr = createTypedArray('float32', len);
                for (i = 0; i < len; i += 1) {
                    arr[i] = (val2[i] - val1[i]) * mult + val1[i];
                }
                return arr;
            } else {
                return (val2 - val1) * mult + val1;
            }
        }

        function nearestKey(time){
            var i, len = data.k.length,index,keyTime;
            if(!data.k.length || typeof(data.k[0]) === 'number'){
                index = 0;
                keyTime = 0;
            } else {
                index = -1;
                time *= elem.comp.globalData.frameRate;
                if (time < data.k[0].t) {
                    index = 1;
                    keyTime = data.k[0].t;
                } else {
                    for(i=0;i<len-1;i+=1){
                        if(time === data.k[i].t){
                            index = i + 1;
                            keyTime = data.k[i].t;
                            break;
                        }else if(time>data.k[i].t && time<data.k[i+1].t){
                            if(time-data.k[i].t > data.k[i+1].t - time){
                                index = i + 2;
                                keyTime = data.k[i+1].t;
                            } else {
                                index = i + 1;
                                keyTime = data.k[i].t;
                            }
                            break;
                        }
                    }
                    if(index === -1){
                        index = i + 1;
                        keyTime = data.k[i].t;
                    }
                }
                
            }
            var ob = {};
            ob.index = index;
            ob.time = keyTime/elem.comp.globalData.frameRate;
            return ob;
        }

        function key(ind){
            var ob, i, len;
            if(!data.k.length || typeof(data.k[0]) === 'number'){
                throw new Error('The property has no keyframe at index ' + ind);
            }
            ind -= 1;
            ob = {
                time: data.k[ind].t/elem.comp.globalData.frameRate
            };
            var arr;
            if(ind === data.k.length - 1 && !data.k[ind].h){
                arr = data.k[ind-1].e;
            }else{
                arr = data.k[ind].s;
            }
            len = arr.length;
            for(i=0;i<len;i+=1){
                ob[i] = arr[i];
            }
            return ob;
        }

        function framesToTime(frames, fps) { 
            if (!fps) {
                fps = elem.comp.globalData.frameRate;
            }
            return frames / fps;
        }

        function timeToFrames(t, fps) {
            if (!t && t !== 0) {
                t = time;
            }
            if (!fps) {
                fps = elem.comp.globalData.frameRate;
            }
            return t * fps;
        }

        function seedRandom(seed){
            BMMath.seedrandom(randSeed + seed);
        }

        function sourceRectAtTime() {
            return elem.sourceRectAtTime();
        }

        function substring(init, end) {
            if(typeof value === 'string') {
                if(end === undefined) {
                return value.substring(init)
                }
                return value.substring(init, end)
            }
            return '';
        }

        function substr(init, end) {
            if(typeof value === 'string') {
                if(end === undefined) {
                return value.substr(init)
                }
                return value.substr(init, end)
            }
            return '';
        }

        var time, velocity, value, text, textIndex, textTotal, selectorValue;
        var index = elem.data.ind;
        var hasParent = !!(elem.hierarchy && elem.hierarchy.length);
        var parent;
        var randSeed = Math.floor(Math.random()*1000000);
        var globalData = elem.globalData;
        function executeExpression(_value) {
            // globalData.pushExpression();
            value = _value;
            if (_needsRandom) {
                seedRandom(randSeed);
            }
            if (this.frameExpressionId === elem.globalData.frameId && this.propType !== 'textSelector') {
                return value;
            }
            if(this.propType === 'textSelector'){
                textIndex = this.textIndex;
                textTotal = this.textTotal;
                selectorValue = this.selectorValue;
            }
            if (!thisLayer) {
                text = elem.layerInterface.text;
                thisLayer = elem.layerInterface;
                thisComp = elem.comp.compInterface;
                toWorld = thisLayer.toWorld.bind(thisLayer);
                fromWorld = thisLayer.fromWorld.bind(thisLayer);
                fromComp = thisLayer.fromComp.bind(thisLayer);
                toComp = thisLayer.toComp.bind(thisLayer);
                mask = thisLayer.mask ? thisLayer.mask.bind(thisLayer) : null;
                fromCompToSurface = fromComp;
            }
            if (!transform) {
                transform = elem.layerInterface("ADBE Transform Group");
                $bm_transform = transform;
                if(transform) {
                    anchorPoint = transform.anchorPoint;
                    /*position = transform.position;
                    rotation = transform.rotation;
                    scale = transform.scale;*/
                }
            }
            
            if (elemType === 4 && !content) {
                content = thisLayer("ADBE Root Vectors Group");
            }
            if (!effect) {
                effect = thisLayer(4);
            }
            hasParent = !!(elem.hierarchy && elem.hierarchy.length);
            if (hasParent && !parent) {
                parent = elem.hierarchy[0].layerInterface;
            }
            time = this.comp.renderedFrame/this.comp.globalData.frameRate;
            if (needsVelocity) {
                velocity = velocityAtTime(time);
            }
            expression_function();
            this.frameExpressionId = elem.globalData.frameId;


            //TODO: Check if it's possible to return on ShapeInterface the .v value
            if (scoped_bm_rt.propType === "shape") {
                scoped_bm_rt = scoped_bm_rt.v;
            }
            // globalData.popExpression();
            return scoped_bm_rt;
        }
        return executeExpression;
    }

    ob.initiateExpression = initiateExpression;
    return ob;
}());