| 1 | (function (global, factory) {
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| 2 | typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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| 3 | typeof define === 'function' && define.amd ? define(['exports'], factory) :
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| 4 | (global = global || self, factory(global.estreeWalker = {}));
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| 5 | }(this, (function (exports) { 'use strict';
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| 6 |
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| 7 | // @ts-check
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| 8 | /** @typedef { import('estree').BaseNode} BaseNode */
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| 9 |
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| 10 | /** @typedef {{
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| 11 | skip: () => void;
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| 12 | remove: () => void;
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| 13 | replace: (node: BaseNode) => void;
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| 14 | }} WalkerContext */
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| 15 |
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| 16 | class WalkerBase {
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| 17 | constructor() {
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| 18 | /** @type {boolean} */
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| 19 | this.should_skip = false;
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| 20 |
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| 21 | /** @type {boolean} */
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| 22 | this.should_remove = false;
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| 23 |
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| 24 | /** @type {BaseNode | null} */
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| 25 | this.replacement = null;
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| 26 |
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| 27 | /** @type {WalkerContext} */
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| 28 | this.context = {
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| 29 | skip: () => (this.should_skip = true),
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| 30 | remove: () => (this.should_remove = true),
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| 31 | replace: (node) => (this.replacement = node)
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| 32 | };
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| 33 | }
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| 34 |
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| 35 | /**
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| 36 | *
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| 37 | * @param {any} parent
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| 38 | * @param {string} prop
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| 39 | * @param {number} index
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| 40 | * @param {BaseNode} node
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| 41 | */
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| 42 | replace(parent, prop, index, node) {
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| 43 | if (parent) {
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| 44 | if (index !== null) {
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| 45 | parent[prop][index] = node;
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| 46 | } else {
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| 47 | parent[prop] = node;
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| 48 | }
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| 49 | }
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| 50 | }
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| 51 |
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| 52 | /**
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| 53 | *
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| 54 | * @param {any} parent
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| 55 | * @param {string} prop
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| 56 | * @param {number} index
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| 57 | */
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| 58 | remove(parent, prop, index) {
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| 59 | if (parent) {
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| 60 | if (index !== null) {
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| 61 | parent[prop].splice(index, 1);
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| 62 | } else {
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| 63 | delete parent[prop];
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| 64 | }
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| 65 | }
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| 66 | }
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| 67 | }
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| 68 |
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| 69 | // @ts-check
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| 70 |
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| 71 | /** @typedef { import('estree').BaseNode} BaseNode */
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| 72 | /** @typedef { import('./walker.js').WalkerContext} WalkerContext */
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| 73 |
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| 74 | /** @typedef {(
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| 75 | * this: WalkerContext,
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| 76 | * node: BaseNode,
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| 77 | * parent: BaseNode,
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| 78 | * key: string,
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| 79 | * index: number
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| 80 | * ) => void} SyncHandler */
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| 81 |
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| 82 | class SyncWalker extends WalkerBase {
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| 83 | /**
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| 84 | *
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| 85 | * @param {SyncHandler} enter
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| 86 | * @param {SyncHandler} leave
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| 87 | */
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| 88 | constructor(enter, leave) {
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| 89 | super();
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| 90 |
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| 91 | /** @type {SyncHandler} */
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| 92 | this.enter = enter;
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| 93 |
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| 94 | /** @type {SyncHandler} */
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| 95 | this.leave = leave;
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| 96 | }
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| 97 |
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| 98 | /**
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| 99 | *
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| 100 | * @param {BaseNode} node
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| 101 | * @param {BaseNode} parent
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| 102 | * @param {string} [prop]
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| 103 | * @param {number} [index]
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| 104 | * @returns {BaseNode}
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| 105 | */
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| 106 | visit(node, parent, prop, index) {
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| 107 | if (node) {
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| 108 | if (this.enter) {
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| 109 | const _should_skip = this.should_skip;
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| 110 | const _should_remove = this.should_remove;
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| 111 | const _replacement = this.replacement;
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| 112 | this.should_skip = false;
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| 113 | this.should_remove = false;
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| 114 | this.replacement = null;
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| 115 |
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| 116 | this.enter.call(this.context, node, parent, prop, index);
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| 117 |
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| 118 | if (this.replacement) {
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| 119 | node = this.replacement;
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| 120 | this.replace(parent, prop, index, node);
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| 121 | }
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| 122 |
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| 123 | if (this.should_remove) {
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| 124 | this.remove(parent, prop, index);
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| 125 | }
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| 126 |
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| 127 | const skipped = this.should_skip;
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| 128 | const removed = this.should_remove;
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| 129 |
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| 130 | this.should_skip = _should_skip;
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| 131 | this.should_remove = _should_remove;
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| 132 | this.replacement = _replacement;
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| 133 |
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| 134 | if (skipped) return node;
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| 135 | if (removed) return null;
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| 136 | }
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| 137 |
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| 138 | for (const key in node) {
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| 139 | const value = node[key];
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| 140 |
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| 141 | if (typeof value !== "object") {
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| 142 | continue;
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| 143 | } else if (Array.isArray(value)) {
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| 144 | for (let i = 0; i < value.length; i += 1) {
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| 145 | if (value[i] !== null && typeof value[i].type === 'string') {
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| 146 | if (!this.visit(value[i], node, key, i)) {
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| 147 | // removed
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| 148 | i--;
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| 149 | }
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| 150 | }
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| 151 | }
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| 152 | } else if (value !== null && typeof value.type === "string") {
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| 153 | this.visit(value, node, key, null);
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| 154 | }
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| 155 | }
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| 156 |
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| 157 | if (this.leave) {
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| 158 | const _replacement = this.replacement;
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| 159 | const _should_remove = this.should_remove;
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| 160 | this.replacement = null;
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| 161 | this.should_remove = false;
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| 162 |
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| 163 | this.leave.call(this.context, node, parent, prop, index);
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| 164 |
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| 165 | if (this.replacement) {
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| 166 | node = this.replacement;
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| 167 | this.replace(parent, prop, index, node);
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| 168 | }
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| 169 |
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| 170 | if (this.should_remove) {
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| 171 | this.remove(parent, prop, index);
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| 172 | }
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| 173 |
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| 174 | const removed = this.should_remove;
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| 175 |
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| 176 | this.replacement = _replacement;
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| 177 | this.should_remove = _should_remove;
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| 178 |
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| 179 | if (removed) return null;
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| 180 | }
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| 181 | }
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| 182 |
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| 183 | return node;
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| 184 | }
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| 185 | }
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| 186 |
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| 187 | // @ts-check
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| 188 |
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| 189 | /** @typedef { import('estree').BaseNode} BaseNode */
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| 190 | /** @typedef { import('./walker').WalkerContext} WalkerContext */
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| 191 |
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| 192 | /** @typedef {(
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| 193 | * this: WalkerContext,
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| 194 | * node: BaseNode,
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| 195 | * parent: BaseNode,
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| 196 | * key: string,
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| 197 | * index: number
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| 198 | * ) => Promise<void>} AsyncHandler */
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| 199 |
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| 200 | class AsyncWalker extends WalkerBase {
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| 201 | /**
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| 202 | *
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| 203 | * @param {AsyncHandler} enter
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| 204 | * @param {AsyncHandler} leave
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| 205 | */
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| 206 | constructor(enter, leave) {
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| 207 | super();
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| 208 |
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| 209 | /** @type {AsyncHandler} */
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| 210 | this.enter = enter;
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| 211 |
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| 212 | /** @type {AsyncHandler} */
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| 213 | this.leave = leave;
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| 214 | }
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| 215 |
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| 216 | /**
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| 217 | *
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| 218 | * @param {BaseNode} node
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| 219 | * @param {BaseNode} parent
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| 220 | * @param {string} [prop]
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| 221 | * @param {number} [index]
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| 222 | * @returns {Promise<BaseNode>}
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| 223 | */
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| 224 | async visit(node, parent, prop, index) {
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| 225 | if (node) {
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| 226 | if (this.enter) {
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| 227 | const _should_skip = this.should_skip;
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| 228 | const _should_remove = this.should_remove;
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| 229 | const _replacement = this.replacement;
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| 230 | this.should_skip = false;
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| 231 | this.should_remove = false;
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| 232 | this.replacement = null;
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| 233 |
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| 234 | await this.enter.call(this.context, node, parent, prop, index);
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| 235 |
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| 236 | if (this.replacement) {
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| 237 | node = this.replacement;
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| 238 | this.replace(parent, prop, index, node);
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| 239 | }
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| 240 |
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| 241 | if (this.should_remove) {
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| 242 | this.remove(parent, prop, index);
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| 243 | }
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| 244 |
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| 245 | const skipped = this.should_skip;
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| 246 | const removed = this.should_remove;
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| 247 |
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| 248 | this.should_skip = _should_skip;
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| 249 | this.should_remove = _should_remove;
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| 250 | this.replacement = _replacement;
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| 251 |
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| 252 | if (skipped) return node;
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| 253 | if (removed) return null;
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| 254 | }
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| 255 |
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| 256 | for (const key in node) {
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| 257 | const value = node[key];
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| 258 |
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| 259 | if (typeof value !== "object") {
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| 260 | continue;
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| 261 | } else if (Array.isArray(value)) {
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| 262 | for (let i = 0; i < value.length; i += 1) {
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| 263 | if (value[i] !== null && typeof value[i].type === 'string') {
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| 264 | if (!(await this.visit(value[i], node, key, i))) {
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| 265 | // removed
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| 266 | i--;
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| 267 | }
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| 268 | }
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| 269 | }
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| 270 | } else if (value !== null && typeof value.type === "string") {
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| 271 | await this.visit(value, node, key, null);
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| 272 | }
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| 273 | }
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| 274 |
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| 275 | if (this.leave) {
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| 276 | const _replacement = this.replacement;
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| 277 | const _should_remove = this.should_remove;
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| 278 | this.replacement = null;
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| 279 | this.should_remove = false;
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| 280 |
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| 281 | await this.leave.call(this.context, node, parent, prop, index);
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| 282 |
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| 283 | if (this.replacement) {
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| 284 | node = this.replacement;
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| 285 | this.replace(parent, prop, index, node);
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| 286 | }
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| 287 |
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| 288 | if (this.should_remove) {
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| 289 | this.remove(parent, prop, index);
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| 290 | }
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| 291 |
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| 292 | const removed = this.should_remove;
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| 293 |
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| 294 | this.replacement = _replacement;
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| 295 | this.should_remove = _should_remove;
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| 296 |
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| 297 | if (removed) return null;
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| 298 | }
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| 299 | }
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| 300 |
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| 301 | return node;
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| 302 | }
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| 303 | }
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| 304 |
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| 305 | // @ts-check
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| 306 |
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| 307 | /** @typedef { import('estree').BaseNode} BaseNode */
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| 308 | /** @typedef { import('./sync.js').SyncHandler} SyncHandler */
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| 309 | /** @typedef { import('./async.js').AsyncHandler} AsyncHandler */
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| 310 |
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| 311 | /**
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| 312 | *
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| 313 | * @param {BaseNode} ast
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| 314 | * @param {{
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| 315 | * enter?: SyncHandler
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| 316 | * leave?: SyncHandler
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| 317 | * }} walker
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| 318 | * @returns {BaseNode}
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| 319 | */
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| 320 | function walk(ast, { enter, leave }) {
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| 321 | const instance = new SyncWalker(enter, leave);
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| 322 | return instance.visit(ast, null);
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| 323 | }
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| 324 |
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| 325 | /**
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| 326 | *
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| 327 | * @param {BaseNode} ast
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| 328 | * @param {{
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| 329 | * enter?: AsyncHandler
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| 330 | * leave?: AsyncHandler
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| 331 | * }} walker
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| 332 | * @returns {Promise<BaseNode>}
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| 333 | */
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| 334 | async function asyncWalk(ast, { enter, leave }) {
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| 335 | const instance = new AsyncWalker(enter, leave);
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| 336 | return await instance.visit(ast, null);
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| 337 | }
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| 338 |
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| 339 | exports.asyncWalk = asyncWalk;
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| 340 | exports.walk = walk;
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| 341 |
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| 342 | Object.defineProperty(exports, '__esModule', { value: true });
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| 343 |
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| 344 | })));
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