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| import * as escodegen from 'escodegen';
import * as esprima from 'esprima';
import * as estraverse from 'estraverse';
import * as ESTree from 'estree';
import { TNodeWithBlockStatement } from '../types/node/TNodeWithBlockStatement';
import { TStatement } from '../types/node/TStatement';
import { NodeType } from '../enums/NodeType';
import { Node } from './Node';
import { Nodes } from './Nodes';
export class NodeUtils {
/**
* @type {string[]}
*/
private static readonly nodesWithBlockScope: string[] = [
NodeType.ArrowFunctionExpression,
NodeType.FunctionDeclaration,
NodeType.FunctionExpression,
NodeType.MethodDefinition,
NodeType.Program
];
/**
* @param astTree
* @return {T}
*/
public static addXVerbatimPropertyToLiterals <T extends ESTree.Node> (astTree: T): T {
NodeUtils.typedReplace(astTree, NodeType.Literal, {
leave: (literalNode: ESTree.Literal) => {
literalNode['x-verbatim-property'] = {
content : literalNode.raw,
precedence: escodegen.Precedence.Primary
};
}
});
return astTree;
}
/**
* @param code
* @returns {TStatement[]}
*/
public static convertCodeToStructure (code: string): TStatement[] {
let structure: ESTree.Program = esprima.parse(code);
structure = NodeUtils.addXVerbatimPropertyToLiterals(structure);
structure = NodeUtils.parentize(structure);
return <TStatement[]>structure.body;
}
/**
* @param structure
* @returns {string}
*/
public static convertStructureToCode (structure: ESTree.Node[]): string {
let code: string = '';
structure.forEach((node: ESTree.Node) => {
code += escodegen.generate(node, {
sourceMapWithCode: true
}).code;
});
return code;
}
/**
* @param node
* @param index
* @returns {ESTree.Node}
*/
public static getBlockStatementNodeByIndex (node: ESTree.Node, index: number = 0): ESTree.Node {
if (Node.isNodeHasBlockStatement(node)) {
if (node.body[index] === undefined) {
throw new ReferenceError(`Wrong index \`${index}\`. Block-statement body length is \`${node.body.length}\``);
}
return node.body[index];
}
throw new TypeError('The specified node have no a block-statement');
}
/**
* @param node
* @param blockScopes
* @returns {ESTree.Node}
*/
public static getBlockScopesOfNode (node: ESTree.Node, blockScopes: TNodeWithBlockStatement[] = []): TNodeWithBlockStatement[] {
const parentNode: ESTree.Node | undefined = node.parentNode;
if (!parentNode) {
throw new ReferenceError('`parentNode` property of given node is `undefined`');
}
if (Node.isBlockStatementNode(parentNode)) {
Iif (!parentNode.parentNode) {
throw new ReferenceError('`parentNode` property of `parentNode` of given node is `undefined`');
}
if (NodeUtils.nodesWithBlockScope.includes(parentNode.parentNode.type)) {
blockScopes.push(parentNode);
}
}
if (!Node.isProgramNode(parentNode)) {
return NodeUtils.getBlockScopesOfNode(parentNode, blockScopes);
}
blockScopes.push(parentNode);
return blockScopes;
}
/**
* @param node
* @param depth
* @returns {number}
*/
public static getNodeBlockScopeDepth (node: ESTree.Node, depth: number = 0): number {
const parentNode: ESTree.Node | undefined = node.parentNode;
if (!parentNode) {
throw new ReferenceError('`parentNode` property of given node is `undefined`');
}
if (Node.isProgramNode(parentNode)) {
return depth;
}
if (Node.isBlockStatementNode(node) && NodeUtils.nodesWithBlockScope.includes(parentNode.type)) {
return NodeUtils.getNodeBlockScopeDepth(parentNode, ++depth);
}
return NodeUtils.getNodeBlockScopeDepth(parentNode, depth);
}
/**
* @param unaryExpressionNode
* @returns {ESTree.Node}
*/
public static getUnaryExpressionArgumentNode (unaryExpressionNode: ESTree.UnaryExpression): ESTree.Node {
if (Node.isUnaryExpressionNode(unaryExpressionNode.argument)) {
return NodeUtils.getUnaryExpressionArgumentNode(unaryExpressionNode.argument);
}
return unaryExpressionNode.argument;
}
/**
* @param astTree
* @return {T}
*/
public static parentize <T extends ESTree.Node> (astTree: T): T {
let isRootNode: boolean = true;
estraverse.traverse(astTree, {
enter: (node: ESTree.Node, parentNode: ESTree.Node): any => {
let value: ESTree.Node;
if (isRootNode) {
if (node.type === NodeType.Program) {
value = node;
} else {
value = Nodes.getProgramNode(<TStatement[]>[node]);
value.parentNode = value;
}
isRootNode = false;
} else {
value = parentNode || node;
}
node.parentNode = value;
node.obfuscatedNode = false;
}
});
return astTree;
}
/**
* @param astTree
* @param nodeType
* @param visitor
*/
public static typedReplace (
astTree: ESTree.Node,
nodeType: string,
visitor: {enter?: (node: ESTree.Node) => void, leave?: (node: ESTree.Node) => void},
): void {
NodeUtils.typedTraverse(astTree, nodeType, visitor, 'replace');
}
/**
* @param astTree
* @param nodeType
* @param visitor
* @param traverseType
*/
public static typedTraverse (
astTree: ESTree.Node,
nodeType: string,
visitor: estraverse.Visitor,
traverseType: string = 'traverse'
): void {
(<any>estraverse)[traverseType](astTree, {
enter: (node: ESTree.Node, parentNode: ESTree.Node): any => {
if (node.type === nodeType && visitor.enter) {
return visitor.enter(node, parentNode);
}
},
leave: (node: ESTree.Node, parentNode: ESTree.Node): any => {
if (node.type === nodeType && visitor.leave) {
return visitor.leave(node, parentNode);
}
}
});
}
}
|