345 lines
7.6 KiB
JavaScript
345 lines
7.6 KiB
JavaScript
(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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typeof define === 'function' && define.amd ? define(['exports'], factory) :
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(global = global || self, factory(global.estreeWalker = {}));
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}(this, (function (exports) { 'use strict';
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// @ts-check
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/** @typedef { import('estree').BaseNode} BaseNode */
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/** @typedef {{
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skip: () => void;
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remove: () => void;
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replace: (node: BaseNode) => void;
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}} WalkerContext */
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class WalkerBase {
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constructor() {
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/** @type {boolean} */
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this.should_skip = false;
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/** @type {boolean} */
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this.should_remove = false;
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/** @type {BaseNode | null} */
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this.replacement = null;
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/** @type {WalkerContext} */
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this.context = {
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skip: () => (this.should_skip = true),
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remove: () => (this.should_remove = true),
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replace: (node) => (this.replacement = node)
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};
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}
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/**
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*
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* @param {any} parent
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* @param {string} prop
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* @param {number} index
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* @param {BaseNode} node
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*/
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replace(parent, prop, index, node) {
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if (parent) {
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if (index !== null) {
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parent[prop][index] = node;
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} else {
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parent[prop] = node;
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}
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}
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}
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/**
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*
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* @param {any} parent
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* @param {string} prop
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* @param {number} index
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*/
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remove(parent, prop, index) {
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if (parent) {
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if (index !== null) {
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parent[prop].splice(index, 1);
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} else {
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delete parent[prop];
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}
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}
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}
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}
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// @ts-check
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/** @typedef { import('estree').BaseNode} BaseNode */
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/** @typedef { import('./walker.js').WalkerContext} WalkerContext */
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/** @typedef {(
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* this: WalkerContext,
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* node: BaseNode,
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* parent: BaseNode,
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* key: string,
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* index: number
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* ) => void} SyncHandler */
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class SyncWalker extends WalkerBase {
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/**
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*
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* @param {SyncHandler} enter
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* @param {SyncHandler} leave
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*/
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constructor(enter, leave) {
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super();
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/** @type {SyncHandler} */
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this.enter = enter;
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/** @type {SyncHandler} */
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this.leave = leave;
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}
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/**
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*
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* @param {BaseNode} node
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* @param {BaseNode} parent
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* @param {string} [prop]
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* @param {number} [index]
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* @returns {BaseNode}
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*/
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visit(node, parent, prop, index) {
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if (node) {
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if (this.enter) {
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const _should_skip = this.should_skip;
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const _should_remove = this.should_remove;
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const _replacement = this.replacement;
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this.should_skip = false;
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this.should_remove = false;
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this.replacement = null;
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this.enter.call(this.context, node, parent, prop, index);
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if (this.replacement) {
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node = this.replacement;
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this.replace(parent, prop, index, node);
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}
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if (this.should_remove) {
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this.remove(parent, prop, index);
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}
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const skipped = this.should_skip;
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const removed = this.should_remove;
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this.should_skip = _should_skip;
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this.should_remove = _should_remove;
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this.replacement = _replacement;
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if (skipped) return node;
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if (removed) return null;
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}
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for (const key in node) {
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const value = node[key];
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if (typeof value !== "object") {
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continue;
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} else if (Array.isArray(value)) {
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for (let i = 0; i < value.length; i += 1) {
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if (value[i] !== null && typeof value[i].type === 'string') {
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if (!this.visit(value[i], node, key, i)) {
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// removed
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i--;
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}
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}
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}
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} else if (value !== null && typeof value.type === "string") {
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this.visit(value, node, key, null);
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}
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}
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if (this.leave) {
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const _replacement = this.replacement;
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const _should_remove = this.should_remove;
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this.replacement = null;
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this.should_remove = false;
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this.leave.call(this.context, node, parent, prop, index);
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if (this.replacement) {
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node = this.replacement;
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this.replace(parent, prop, index, node);
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}
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if (this.should_remove) {
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this.remove(parent, prop, index);
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}
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const removed = this.should_remove;
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this.replacement = _replacement;
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this.should_remove = _should_remove;
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if (removed) return null;
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}
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}
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return node;
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}
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}
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// @ts-check
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/** @typedef { import('estree').BaseNode} BaseNode */
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/** @typedef { import('./walker').WalkerContext} WalkerContext */
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/** @typedef {(
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* this: WalkerContext,
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* node: BaseNode,
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* parent: BaseNode,
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* key: string,
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* index: number
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* ) => Promise<void>} AsyncHandler */
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class AsyncWalker extends WalkerBase {
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/**
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*
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* @param {AsyncHandler} enter
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* @param {AsyncHandler} leave
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*/
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constructor(enter, leave) {
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super();
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/** @type {AsyncHandler} */
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this.enter = enter;
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/** @type {AsyncHandler} */
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this.leave = leave;
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}
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/**
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*
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* @param {BaseNode} node
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* @param {BaseNode} parent
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* @param {string} [prop]
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* @param {number} [index]
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* @returns {Promise<BaseNode>}
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*/
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async visit(node, parent, prop, index) {
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if (node) {
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if (this.enter) {
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const _should_skip = this.should_skip;
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const _should_remove = this.should_remove;
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const _replacement = this.replacement;
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this.should_skip = false;
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this.should_remove = false;
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this.replacement = null;
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await this.enter.call(this.context, node, parent, prop, index);
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if (this.replacement) {
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node = this.replacement;
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this.replace(parent, prop, index, node);
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}
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if (this.should_remove) {
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this.remove(parent, prop, index);
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}
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const skipped = this.should_skip;
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const removed = this.should_remove;
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this.should_skip = _should_skip;
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this.should_remove = _should_remove;
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this.replacement = _replacement;
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if (skipped) return node;
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if (removed) return null;
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}
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for (const key in node) {
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const value = node[key];
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if (typeof value !== "object") {
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continue;
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} else if (Array.isArray(value)) {
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for (let i = 0; i < value.length; i += 1) {
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if (value[i] !== null && typeof value[i].type === 'string') {
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if (!(await this.visit(value[i], node, key, i))) {
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// removed
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i--;
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}
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}
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}
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} else if (value !== null && typeof value.type === "string") {
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await this.visit(value, node, key, null);
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}
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}
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if (this.leave) {
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const _replacement = this.replacement;
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const _should_remove = this.should_remove;
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this.replacement = null;
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this.should_remove = false;
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await this.leave.call(this.context, node, parent, prop, index);
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if (this.replacement) {
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node = this.replacement;
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this.replace(parent, prop, index, node);
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}
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if (this.should_remove) {
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this.remove(parent, prop, index);
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}
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const removed = this.should_remove;
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this.replacement = _replacement;
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this.should_remove = _should_remove;
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if (removed) return null;
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}
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}
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return node;
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}
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}
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// @ts-check
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/** @typedef { import('estree').BaseNode} BaseNode */
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/** @typedef { import('./sync.js').SyncHandler} SyncHandler */
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/** @typedef { import('./async.js').AsyncHandler} AsyncHandler */
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/**
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*
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* @param {BaseNode} ast
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* @param {{
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* enter?: SyncHandler
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* leave?: SyncHandler
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* }} walker
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* @returns {BaseNode}
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*/
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function walk(ast, { enter, leave }) {
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const instance = new SyncWalker(enter, leave);
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return instance.visit(ast, null);
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}
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/**
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*
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* @param {BaseNode} ast
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* @param {{
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* enter?: AsyncHandler
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* leave?: AsyncHandler
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* }} walker
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* @returns {Promise<BaseNode>}
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*/
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async function asyncWalk(ast, { enter, leave }) {
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const instance = new AsyncWalker(enter, leave);
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return await instance.visit(ast, null);
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}
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exports.asyncWalk = asyncWalk;
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exports.walk = walk;
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Object.defineProperty(exports, '__esModule', { value: true });
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})));
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