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

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+import CompExpressionInterface from './CompInterface';
+import ExpressionManager from './ExpressionManager';
+
+const Expressions = (function () {
+  var ob = {};
+  ob.initExpressions = initExpressions;
+  ob.resetFrame = ExpressionManager.resetFrame;
+
+  function initExpressions(animation) {
+    var stackCount = 0;
+    var registers = [];
+
+    function pushExpression() {
+      stackCount += 1;
+    }
+
+    function popExpression() {
+      stackCount -= 1;
+      if (stackCount === 0) {
+        releaseInstances();
+      }
+    }
+
+    function registerExpressionProperty(expression) {
+      if (registers.indexOf(expression) === -1) {
+        registers.push(expression);
+      }
+    }
+
+    function releaseInstances() {
+      var i;
+      var len = registers.length;
+      for (i = 0; i < len; i += 1) {
+        registers[i].release();
+      }
+      registers.length = 0;
+    }
+
+    animation.renderer.compInterface = CompExpressionInterface(animation.renderer);
+    animation.renderer.globalData.projectInterface.registerComposition(animation.renderer);
+    animation.renderer.globalData.pushExpression = pushExpression;
+    animation.renderer.globalData.popExpression = popExpression;
+    animation.renderer.globalData.registerExpressionProperty = registerExpressionProperty;
+  }
+  return ob;
+}());
+
+export default Expressions;