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node_modules/lottie-web/player/js/utils/expressions/ExpressionValueFactory.js

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+import {
+  createTypedArray,
+} from '../helpers/arrays';
+
+const ExpressionPropertyInterface = (function () {
+  var defaultUnidimensionalValue = { pv: 0, v: 0, mult: 1 };
+  var defaultMultidimensionalValue = { pv: [0, 0, 0], v: [0, 0, 0], mult: 1 };
+
+  function completeProperty(expressionValue, property, type) {
+    Object.defineProperty(expressionValue, 'velocity', {
+      get: function () {
+        return property.getVelocityAtTime(property.comp.currentFrame);
+      },
+    });
+    expressionValue.numKeys = property.keyframes ? property.keyframes.length : 0;
+    expressionValue.key = function (pos) {
+      if (!expressionValue.numKeys) {
+        return 0;
+      }
+      var value = '';
+      if ('s' in property.keyframes[pos - 1]) {
+        value = property.keyframes[pos - 1].s;
+      } else if ('e' in property.keyframes[pos - 2]) {
+        value = property.keyframes[pos - 2].e;
+      } else {
+        value = property.keyframes[pos - 2].s;
+      }
+      var valueProp = type === 'unidimensional' ? new Number(value) : Object.assign({}, value); // eslint-disable-line no-new-wrappers
+      valueProp.time = property.keyframes[pos - 1].t / property.elem.comp.globalData.frameRate;
+      valueProp.value = type === 'unidimensional' ? value[0] : value;
+      return valueProp;
+    };
+    expressionValue.valueAtTime = property.getValueAtTime;
+    expressionValue.speedAtTime = property.getSpeedAtTime;
+    expressionValue.velocityAtTime = property.getVelocityAtTime;
+    expressionValue.propertyGroup = property.propertyGroup;
+  }
+
+  function UnidimensionalPropertyInterface(property) {
+    if (!property || !('pv' in property)) {
+      property = defaultUnidimensionalValue;
+    }
+    var mult = 1 / property.mult;
+    var val = property.pv * mult;
+    var expressionValue = new Number(val); // eslint-disable-line no-new-wrappers
+    expressionValue.value = val;
+    completeProperty(expressionValue, property, 'unidimensional');
+
+    return function () {
+      if (property.k) {
+        property.getValue();
+      }
+      val = property.v * mult;
+      if (expressionValue.value !== val) {
+        expressionValue = new Number(val); // eslint-disable-line no-new-wrappers
+        expressionValue.value = val;
+        completeProperty(expressionValue, property, 'unidimensional');
+      }
+      return expressionValue;
+    };
+  }
+
+  function MultidimensionalPropertyInterface(property) {
+    if (!property || !('pv' in property)) {
+      property = defaultMultidimensionalValue;
+    }
+    var mult = 1 / property.mult;
+    var len = (property.data && property.data.l) || property.pv.length;
+    var expressionValue = createTypedArray('float32', len);
+    var arrValue = createTypedArray('float32', len);
+    expressionValue.value = arrValue;
+    completeProperty(expressionValue, property, 'multidimensional');
+
+    return function () {
+      if (property.k) {
+        property.getValue();
+      }
+      for (var i = 0; i < len; i += 1) {
+        arrValue[i] = property.v[i] * mult;
+        expressionValue[i] = arrValue[i];
+      }
+      return expressionValue;
+    };
+  }
+
+  // TODO: try to avoid using this getter
+  function defaultGetter() {
+    return defaultUnidimensionalValue;
+  }
+
+  return function (property) {
+    if (!property) {
+      return defaultGetter;
+    } if (property.propType === 'unidimensional') {
+      return UnidimensionalPropertyInterface(property);
+    }
+    return MultidimensionalPropertyInterface(property);
+  };
+}());
+
+export default ExpressionPropertyInterface;