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import * as escodegen from '@javascript-obfuscator/escodegen';
import * as estraverse from 'estraverse';
import * as ESTree from 'estree';
import { ecmaVersion } from '../constants/EcmaVersion';
import { ASTParserFacade } from '../ASTParserFacade';
import { NodeGuards } from './NodeGuards';
import { NodeMetadata } from './NodeMetadata';
export class NodeUtils {
/**
* @param {ESTree.Literal} literalNode
* @returns {ESTree.Literal}
*/
public static addXVerbatimPropertyTo (literalNode: ESTree.Literal): ESTree.Literal {
literalNode['x-verbatim-property'] = {
content: literalNode.raw,
precedence: escodegen.Precedence.Primary
};
return literalNode;
}
/**
* @param {T} astTree
* @returns {T}
*/
public static clone <T extends ESTree.Node = ESTree.Node> (astTree: T): T {
return NodeUtils.parentizeAst(NodeUtils.cloneRecursive(astTree));
}
/**
* @param {string} code
* @returns {ESTree.Statement[]}
*/
public static convertCodeToStructure (code: string): ESTree.Statement[] {
const structure: ESTree.Program = ASTParserFacade.parse(
code,
{
ecmaVersion,
sourceType: 'script'
}
);
estraverse.replace(structure, {
enter: (node: ESTree.Node, parentNode: ESTree.Node | null): ESTree.Node => {
NodeUtils.parentizeNode(node, parentNode);
if (NodeGuards.isLiteralNode(node)) {
NodeUtils.addXVerbatimPropertyTo(node);
}
NodeMetadata.set(node, { ignoredNode: false });
return node;
}
});
return <ESTree.Statement[]>structure.body;
}
/**
* @param {NodeGuards[]} structure
* @returns {string}
*/
public static convertStructureToCode (structure: ESTree.Node[]): string {
return structure.reduce((code: string, node: ESTree.Node) => {
return code + escodegen.generate(node, {
sourceMapWithCode: true
}).code;
}, '');
}
/**
* @param {UnaryExpression} unaryExpressionNode
* @returns {NodeGuards}
*/
public static getUnaryExpressionArgumentNode (unaryExpressionNode: ESTree.UnaryExpression): ESTree.Node {
if (NodeGuards.isUnaryExpressionNode(unaryExpressionNode.argument)) {
return NodeUtils.getUnaryExpressionArgumentNode(unaryExpressionNode.argument);
}
return unaryExpressionNode.argument;
}
/**
* @param {T} astTree
* @returns {T}
*/
public static parentizeAst <T extends ESTree.Node = ESTree.Node> (astTree: T): T {
const parentNode: ESTree.Node | null = astTree.parentNode ?? null;
estraverse.replace(astTree, {
enter: NodeUtils.parentizeNode
});
if (parentNode) {
astTree.parentNode = parentNode;
}
return astTree;
}
/**
* @param {T} node
* @param {Node} parentNode
* @returns {T}
*/
public static parentizeNode <T extends ESTree.Node = ESTree.Node> (node: T, parentNode: ESTree.Node | null): T {
node.parentNode = parentNode ?? node;
return node;
}
/**
* @param {T} node
* @returns {T}
*/
private static cloneRecursive <T> (node: T): T {
if (node === null) {
return node;
}
const copy: Partial<T> = {};
const nodeKeys: (keyof T)[] = <(keyof T)[]>Object.keys(node);
nodeKeys
.forEach((property: keyof T) => {
if (property === 'parentNode') {
return;
}
const value: T[keyof T] | T[keyof T][] | null = node[property] ?? null;
let clonedValue: T[keyof T] | T[keyof T][] | null;
if (value === null || value instanceof RegExp) {
clonedValue = value;
} else if (value instanceof Array) {
clonedValue = value.map(NodeUtils.cloneRecursive);
} else if (typeof value === 'object') {
clonedValue = NodeUtils.cloneRecursive(value);
} else {
clonedValue = value;
}
copy[property] = <T[keyof T]>clonedValue;
});
return <T>copy;
}
}
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