Code coverage report for src/custom-nodes/NodeAppender.ts

# All files / src/custom-nodes NodeAppender.ts

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100% Branches 8/8
100% Functions 0/0
100% Lines 14/14

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     import * as ESTree from 'estree';

    import { TNodeWithBlockStatement } from '../types/TNodeWithBlockStatement';
    import { TStatement } from '../types/TStatement';

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

    import { NodeUtils } from '../NodeUtils';
    import { Utils } from '../Utils';

    /**
     * This class appends node into a first deepest BlockStatement in order of function calls
     *
     * For example:
     *
     * function Foo () {
     *     var baz = function () {
     *
     *     }
     *
     *     baz();
     * }
     *
     * foo();
     *
     * Appends node into block statement of `baz` function expression.
     */
    export class CustomNodeAppender {
        /**
         * @param blockScopeStackTraceData
         * @param blockScopeNode
         * @param nodeBodyStatements
         * @param index
         */
        public static appendNode (
            blockScopeStackTraceData: IStackTraceData[],
            blockScopeNode: TNodeWithBlockStatement,
            nodeBodyStatements: TStatement[],
            index: number = 0
        ): void {
            let targetBlockScope: TNodeWithBlockStatement;

            if (!blockScopeStackTraceData.length) {
                targetBlockScope = blockScopeNode;
            } else {
                targetBlockScope = CustomNodeAppender.getOptimalBlockScope(
                    blockScopeStackTraceData,
                    index
                );
            }

            NodeUtils.prependNode(targetBlockScope, nodeBodyStatements);
        }

        /**
         * @param stackTraceRootLength
         */
        public static getRandomStackTraceIndex (stackTraceRootLength: number): number {
            return Utils.getRandomGenerator().integer({
                min: 0,
                max: Math.max(0, Math.round(stackTraceRootLength - 1))
            });
        }

        /**
         * @param blockScopeTraceData
         * @param index
         * @returns {ESTree.BlockStatement}
         */
        private static getOptimalBlockScope (
            blockScopeTraceData: IStackTraceData[],
            index: number
        ): ESTree.BlockStatement {
            const firstCall: IStackTraceData = blockScopeTraceData[index];

            if (firstCall.stackTrace.length) {
                return CustomNodeAppender.getOptimalBlockScope(firstCall.stackTrace, 0);
            } else {
                return firstCall.callee;
            }
        }
    }