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NodeUtils.ts
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141 lines (115 loc) · 3.95 KB
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import * as escodegen from 'escodegen-wallaby';
import * as espree from 'espree';
import * as estraverse from 'estraverse';
import * as ESTree from 'estree';
import { TObject } from '../types/TObject';
import { NodeGuards } from './NodeGuards';
import { NodeMetadata } from './NodeMetadata';
export class NodeUtils {
/**
* @param {T} literalNode
* @returns {T}
*/
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 {Statement[]}
*/
public static convertCodeToStructure (code: string): ESTree.Statement[] {
const structure: ESTree.Program = espree.parse(code, { 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 {
estraverse.replace(astTree, {
enter: NodeUtils.parentizeNode
});
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: TObject = {};
Object
.keys(node)
.forEach((property: string) => {
if (property === 'parentNode') {
return;
}
const value: T[keyof T] = node[<keyof T>property];
let clonedValue: T[keyof T] | T[keyof T][] | null;
if (value === null || value instanceof RegExp) {
clonedValue = value;
} else if (Array.isArray(value)) {
clonedValue = value.map(NodeUtils.cloneRecursive);
} else if (typeof value === 'object') {
clonedValue = NodeUtils.cloneRecursive(value);
} else {
clonedValue = value;
}
copy[property] = clonedValue;
});
return <T>copy;
}
}