Code coverage report for src/stack-trace-analyzer/StackTraceAnalyzer.ts

# All files / src/stack-trace-analyzer StackTraceAnalyzer.ts

97.3% Statements 36/37
91.67% Branches 11/12
100% Functions 3/3
97.3% Lines 36/37

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     import * as estraverse from 'estraverse';
    import * as ESTree from 'estree';

    import { TCalleeDataExtractor } from '../types/TCalleeDataExtractor';

    import { ICalleeData } from '../interfaces/stack-trace-analyzer/ICalleeData';
    import { IStackTraceAnalyzer } from '../interfaces/stack-trace-analyzer/IStackTraceAnalyzer';
    import { IStackTraceData } from '../interfaces/stack-trace-analyzer/IStackTraceData';

    import { NodeType } from '../enums/NodeType';

    import { FunctionDeclarationCalleeDataExtractor } from './callee-data-extractors/FunctionDeclarationCalleeDataExtractor';
    import { FunctionExpressionCalleeDataExtractor } from './callee-data-extractors/FunctionExpressionCalleeDataExtractor';
    import { ObjectExpressionCalleeDataExtractor } from './callee-data-extractors/ObjectExpressionCalleeDataExtractor';

    import { Node } from '../node/Node';
    import { NodeUtils } from '../node/NodeUtils';

    /**
     * This class generates a data with code stack trace functions calls
     *
     * For example:
     *
     * function Foo () {
     *     var baz = function () {
     *
     *     }
     *
     *     baz();
     * }
     *
     * foo();
     *
     * Will generate a structure like:
     *
     * [
     *      {
     *          callee: FOO_FUNCTION_NODE
     *          name: 'Foo',
     *          trace: [
     *              {
     *                  callee: BAZ_FUNCTION_NODE,
     *                  name: 'baz,
     *                  trace: []
     *              }
     *          ]
     *      }
     * ]
     */
    export class StackTraceAnalyzer implements IStackTraceAnalyzer {
        /**
         * @type {number}
         */
        private static limitThresholdActivationLength: number = 25;

        /**
         * @type {number}
         */
        private static limitThreshold: number = 0.002;

        /**
         * @type {ESTree.Node[]}
         */
        private blockScopeBody: ESTree.Node[];

        /**
         * @type {Map<string, TCalleeDataExtractor>}
         */
        private calleeDataExtractors: Map <string, TCalleeDataExtractor> = new Map <string, TCalleeDataExtractor> ([
            [NodeType.FunctionDeclaration, FunctionDeclarationCalleeDataExtractor],
            [NodeType.FunctionExpression, FunctionExpressionCalleeDataExtractor],
            [NodeType.ObjectExpression, ObjectExpressionCalleeDataExtractor]
        ]);

        /**
         * @param blockScopeBody
         */
        constructor (blockScopeBody: ESTree.Node[]) {
            this.blockScopeBody = blockScopeBody;
        }

        /**
         * @param blockScopeBodyLength
         * @returns {number}
         */
        public static getLimitIndex (blockScopeBodyLength: number): number {
            const lastIndex: number = blockScopeBodyLength - 1;
            const limitThresholdActivationIndex: number = StackTraceAnalyzer.limitThresholdActivationLength - 1;

            let limitIndex: number = lastIndex;

            if (lastIndex > limitThresholdActivationIndex) {
                limitIndex = Math.round(
                    limitThresholdActivationIndex + (lastIndex * StackTraceAnalyzer.limitThreshold)
                );

                Iif (limitIndex > lastIndex) {
                    limitIndex = lastIndex;
                }
            }

            return limitIndex;
        }

        /**
         * @returns {IStackTraceData[]}
         */
        public analyze (): IStackTraceData[] {
            return this.analyzeRecursive(this.blockScopeBody);
        }

        /**
         * @param blockScopeBody
         * @returns {IStackTraceData[]}
         */
        private analyzeRecursive (blockScopeBody: ESTree.Node[]): IStackTraceData[] {
            const limitIndex: number = StackTraceAnalyzer.getLimitIndex(blockScopeBody.length);
            const stackTraceData: IStackTraceData[] = [];

            for (
                let index: number = 0, blockScopeBodyLength: number = blockScopeBody.length;
                index < blockScopeBodyLength;
                index++
            ) {
                let rootNode: ESTree.Node = blockScopeBody[index];

                if (index > limitIndex) {
                    break;
                }

                estraverse.traverse(rootNode, {
                    enter: (node: ESTree.Node): any => {
                        if (!Node.isCallExpressionNode(node) || rootNode.parentNode !== NodeUtils.getBlockScopeOfNode(node)) {
                            return;
                        }

                        this.calleeDataExtractors.forEach((calleeDataExtractor: TCalleeDataExtractor) => {
                            const calleeData: ICalleeData|null = new calleeDataExtractor(
                                blockScopeBody,
                                node.callee
                            ).extract();

                            if (!calleeData) {
                                return;
                            }

                            stackTraceData.push(Object.assign({}, calleeData, {
                                stackTrace: this.analyzeRecursive(calleeData.callee.body)
                            }));
                        });
                    }
                });
            }

            return stackTraceData;
        }
    }