136 lines
2.8 KiB
JavaScript
136 lines
2.8 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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(factory((global.estreeWalker = {})));
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}(this, (function (exports) { 'use strict';
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function walk(ast, { enter, leave }) {
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return visit(ast, null, enter, leave);
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}
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let should_skip = false;
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let should_remove = false;
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let replacement = null;
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const context = {
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skip: () => should_skip = true,
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remove: () => should_remove = true,
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replace: (node) => replacement = node
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};
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function 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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function 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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function visit(
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node,
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parent,
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enter,
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leave,
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prop,
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index
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) {
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if (node) {
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if (enter) {
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const _should_skip = should_skip;
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const _should_remove = should_remove;
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const _replacement = replacement;
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should_skip = false;
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should_remove = false;
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replacement = null;
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enter.call(context, node, parent, prop, index);
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if (replacement) {
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node = replacement;
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replace(parent, prop, index, node);
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}
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if (should_remove) {
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remove(parent, prop, index);
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}
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const skipped = should_skip;
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const removed = should_remove;
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should_skip = _should_skip;
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should_remove = _should_remove;
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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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}
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else if (Array.isArray(value)) {
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for (let j = 0, k = 0; j < value.length; j += 1, k += 1) {
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if (value[j] !== null && typeof value[j].type === 'string') {
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if (!visit(value[j], node, enter, leave, key, k)) {
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// removed
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j--;
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}
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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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visit(value, node, enter, leave, key, null);
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}
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}
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if (leave) {
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const _replacement = replacement;
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const _should_remove = should_remove;
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replacement = null;
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should_remove = false;
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leave.call(context, node, parent, prop, index);
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if (replacement) {
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node = replacement;
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replace(parent, prop, index, node);
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}
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if (should_remove) {
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remove(parent, prop, index);
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}
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const removed = should_remove;
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replacement = _replacement;
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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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exports.walk = walk;
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Object.defineProperty(exports, '__esModule', { value: true });
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})));
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