"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = loadBlockHoistPlugin;
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function _traverse() {
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const data = require("@babel/traverse");
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_traverse = function () {
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return data;
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};
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return data;
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}
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var _plugin = require("../config/plugin");
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let LOADED_PLUGIN;
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function loadBlockHoistPlugin() {
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if (!LOADED_PLUGIN) {
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LOADED_PLUGIN = new _plugin.default(Object.assign({}, blockHoistPlugin, {
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visitor: _traverse().default.explode(blockHoistPlugin.visitor)
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}), {});
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}
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return LOADED_PLUGIN;
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}
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function priority(bodyNode) {
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const priority = bodyNode == null ? void 0 : bodyNode._blockHoist;
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if (priority == null) return 1;
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if (priority === true) return 2;
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return priority;
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}
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function stableSort(body) {
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const buckets = Object.create(null);
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for (let i = 0; i < body.length; i++) {
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const n = body[i];
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const p = priority(n);
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const bucket = buckets[p] || (buckets[p] = []);
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bucket.push(n);
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}
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const keys = Object.keys(buckets).map(k => +k).sort((a, b) => b - a);
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let index = 0;
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for (const key of keys) {
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const bucket = buckets[key];
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for (const n of bucket) {
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body[index++] = n;
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}
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}
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return body;
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}
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const blockHoistPlugin = {
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name: "internal.blockHoist",
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visitor: {
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Block: {
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exit({
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node
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}) {
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const {
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body
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} = node;
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let max = Math.pow(2, 30) - 1;
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let hasChange = false;
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for (let i = 0; i < body.length; i++) {
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const n = body[i];
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const p = priority(n);
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if (p > max) {
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hasChange = true;
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break;
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}
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max = p;
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}
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if (!hasChange) return;
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node.body = stableSort(body.slice());
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}
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}
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}
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};
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