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NodeUtils.ts
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178 lines (147 loc) · 4.86 KB
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import * as escodegen from 'escodegen';
import * as esprima from 'esprima';
import * as estraverse from 'estraverse';
import { INode } from './interfaces/nodes/INode';
import { TNodeWithBlockStatement } from "./types/TNodeWithBlockStatement";
import { TStatement } from "./types/nodes/TStatement";
import { NodeType } from "./enums/NodeType";
import { Nodes } from "./Nodes";
import { Utils } from "./Utils";
export class NodeUtils {
/**
* @type {string[]}
*/
private static nodesWithBlockScope: string[] = [
NodeType.ArrowFunctionExpression,
NodeType.FunctionDeclaration,
NodeType.FunctionExpression,
NodeType.MethodDefinition,
NodeType.Program
];
/**
* @param node
*/
public static addXVerbatimPropertyToLiterals (node: INode): void {
estraverse.replace(node, {
enter: (node: INode, parentNode: INode): any => {
if (Nodes.isLiteralNode(node)) {
node['x-verbatim-property'] = {
content : node.raw,
precedence: escodegen.Precedence.Primary
};
}
}
});
}
/**
* @param blockScopeBody
* @param node
*/
public static appendNode (blockScopeBody: INode[], node: INode): void {
if (!NodeUtils.validateNode(node)) {
return;
}
blockScopeBody.push(node);
}
/**
* @param code
* @returns {INode}
*/
public static convertCodeToStructure (code: string): INode {
let structure: INode = esprima.parse(code);
NodeUtils.addXVerbatimPropertyToLiterals(structure);
NodeUtils.parentize(structure);
return NodeUtils.getBlockStatementNodeByIndex(structure);
}
/**
* @param node
* @param index
* @returns {INode}
*/
public static getBlockStatementNodeByIndex (node: INode, index: number = 0): INode {
if (Nodes.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 depth
* @returns {INode}
*/
public static getBlockScopeOfNode (node: INode, depth: number = 0): TNodeWithBlockStatement {
let parentNode: INode | undefined = node.parentNode;
if (!parentNode) {
throw new ReferenceError('`parentNode` property of given node is `undefined`');
}
if (Nodes.isBlockStatementNode(parentNode)) {
if (!parentNode.parentNode) {
throw new ReferenceError('`parentNode` property of `parentNode` of given node is `undefined`');
}
if (!Utils.arrayContains(NodeUtils.nodesWithBlockScope, parentNode.parentNode.type)) {
return NodeUtils.getBlockScopeOfNode(parentNode, depth);
} else if (depth > 0) {
return NodeUtils.getBlockScopeOfNode(parentNode, --depth);
}
return parentNode;
}
if (Nodes.isProgramNode(parentNode)) {
return parentNode;
}
return NodeUtils.getBlockScopeOfNode(parentNode);
}
/**
* @param blockScopeBody
* @param node
* @param index
*/
public static insertNodeAtIndex (blockScopeBody: INode[], node: INode, index: number): void {
if (!NodeUtils.validateNode(node)) {
return;
}
blockScopeBody.splice(index, 0, node);
}
/**
* @param node
*/
public static parentize (node: INode): void {
let isRootNode: boolean = true;
estraverse.replace(node, {
enter: (node: INode, parentNode: INode): any => {
let value: INode;
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;
}
});
}
/**
* @param blockScopeBody
* @param node
*/
public static prependNode (blockScopeBody: INode[], node: INode): void {
if (!NodeUtils.validateNode(node)) {
return;
}
blockScopeBody.unshift(node);
}
/**
* @param node
* @returns {boolean}
*/
private static validateNode (node: INode): boolean {
return !!node && node.hasOwnProperty('type');
}
}