Function saveStateAndInvoke

test/fixtures/snapshot/typescript.js:91641–91658

* Visits a node, saving and restoring state variables on the stack. * * @param node The node to visit.

(node, f)

         * @param node The node to visit.
         */
        function saveStateAndInvoke(node, f) {
            // Save state
            var savedCurrentScope = currentLexicalScope;
            var savedCurrentNameScope = currentNameScope;
            var savedCurrentScopeFirstDeclarationsOfName = currentScopeFirstDeclarationsOfName;
            var savedCurrentClassHasParameterProperties = currentClassHasParameterProperties;
            // Handle state changes before visiting a node.
            onBeforeVisitNode(node);
            var visited = f(node);
            // Restore state
            if (currentLexicalScope !== savedCurrentScope) {
                currentScopeFirstDeclarationsOfName = savedCurrentScopeFirstDeclarationsOfName;
            }
            currentLexicalScope = savedCurrentScope;
            currentNameScope = savedCurrentNameScope;
            currentClassHasParameterProperties = savedCurrentClassHasParameterProperties;
            return visited;
        }
        /**
         * Performs actions that should always occur immediately before visiting a node.
         *