Code coverage report for src/node-obfuscators/VariableDeclarationTransformer.ts

# All files / src/node-obfuscators VariableDeclarationTransformer.ts

100% Statements 21/21
100% Branches 8/8
100% Functions 3/3
100% Lines 21/21

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

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

    import { ICustomNode } from '../interfaces/custom-nodes/ICustomNode';
    import { IOptions } from '../interfaces/IOptions';

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

    import { AbstractNodeObfuscator } from './AbstractNodeObfuscator';
    import { IdentifierReplacer } from './replacers/IdentifierReplacer';
    import { Node } from '../node/Node';
    import { NodeUtils } from '../node/NodeUtils';

    /**
     * replaces:
     *     var variable = 1;
     *     variable++;
     *
     * on:
     *     var _0x12d45f = 1;
     *     _0x12d45f++;
     *
     */
    export class VariableDeclarationObfuscator extends AbstractNodeObfuscator {
        /**
         * @type {IdentifierReplacer}
         */
        private identifierReplacer: IdentifierReplacer;

        /**
         * @param nodes
         * @param options
         */
        constructor(nodes: Map <string, ICustomNode>, options: IOptions) {
            super(nodes, options);

            this.identifierReplacer = new IdentifierReplacer(this.nodes, this.options);
        }

        /**
         * @param variableDeclarationNode
         * @param parentNode
         */
        public obfuscateNode (variableDeclarationNode: ESTree.VariableDeclaration, parentNode: ESTree.Node): void {
            const blockScopeOfVariableDeclarationNode: TNodeWithBlockStatement = NodeUtils
                .getBlockScopeOfNode(variableDeclarationNode);

            if (blockScopeOfVariableDeclarationNode.type === NodeType.Program) {
                return;
            }

            const scopeNode: ESTree.Node = variableDeclarationNode.kind === 'var'
                ? blockScopeOfVariableDeclarationNode
                : parentNode;

            this.storeVariableNames(variableDeclarationNode);
            this.replaceVariableNames(scopeNode);
        }

        /**
         * @param variableDeclarationNode
         */
        private storeVariableNames (variableDeclarationNode: ESTree.VariableDeclaration): void {
            variableDeclarationNode.declarations
                .forEach((declarationNode: ESTree.VariableDeclarator) => {
                    NodeUtils.typedReplace(declarationNode.id, NodeType.Identifier, {
                        enter: (node: ESTree.Identifier) => this.identifierReplacer.storeNames(node.name)
                    });
                });
        }

        /**
         * @param scopeNode
         */
        private replaceVariableNames (scopeNode: ESTree.Node): void {
            estraverse.replace(scopeNode, {
                enter: (node: ESTree.Node, parentNode: ESTree.Node): any => {
                    if (!node.obfuscated && Node.isReplaceableIdentifierNode(node, parentNode)) {
                        node.name = this.identifierReplacer.replace(node.name);
                    }
                }
            });
        }
    }