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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const path = require("path");
/**
* @template T
* @typedef {Object} TreeNode
* @property {string} filePath
* @property {TreeNode} parent
* @property {TreeNode[]} children
* @property {number} entries
* @property {boolean} active
* @property {T[] | T | undefined} value
*/
/**
* @template T
* @param {Map<string, T[] | T} plan
* @param {number} limit
* @returns {Map<string, Map<T, string>>} the new plan
*/
module.exports = (plan, limit) => {
const treeMap = new Map();
// Convert to tree
for (const [filePath, value] of plan) {
treeMap.set(filePath, {
filePath,
parent: undefined,
children: undefined,
entries: 1,
active: true,
value
});
}
let currentCount = treeMap.size;
// Create parents and calculate sum of entries
for (const node of treeMap.values()) {
const parentPath = path.dirname(node.filePath);
if (parentPath !== node.filePath) {
let parent = treeMap.get(parentPath);
if (parent === undefined) {
parent = {
filePath: parentPath,
parent: undefined,
children: [node],
entries: node.entries,
active: false,
value: undefined
};
treeMap.set(parentPath, parent);
node.parent = parent;
} else {
node.parent = parent;
if (parent.children === undefined) {
parent.children = [node];
} else {
parent.children.push(node);
}
do {
parent.entries += node.entries;
parent = parent.parent;
} while (parent);
}
}
}
// Reduce until limit reached
while (currentCount > limit) {
// Select node that helps reaching the limit most effectively without overmerging
const overLimit = currentCount - limit;
let bestNode = undefined;
let bestCost = Infinity;
for (const node of treeMap.values()) {
if (node.entries <= 1 || !node.children || !node.parent) continue;
if (node.children.length === 0) continue;
if (node.children.length === 1 && !node.value) continue;
// Try to select the node with has just a bit more entries than we need to reduce
// When just a bit more is over 30% over the limit,
// also consider just a bit less entries then we need to reduce
const cost =
node.entries - 1 >= overLimit
? node.entries - 1 - overLimit
: overLimit - node.entries + 1 + limit * 0.3;
if (cost < bestCost) {
bestNode = node;
bestCost = cost;
}
}
if (!bestNode) break;
// Merge all children
const reduction = bestNode.entries - 1;
bestNode.active = true;
bestNode.entries = 1;
currentCount -= reduction;
let parent = bestNode.parent;
while (parent) {
parent.entries -= reduction;
parent = parent.parent;
}
const queue = new Set(bestNode.children);
for (const node of queue) {
node.active = false;
node.entries = 0;
if (node.children) {
for (const child of node.children) queue.add(child);
}
}
}
// Write down new plan
const newPlan = new Map();
for (const rootNode of treeMap.values()) {
if (!rootNode.active) continue;
const map = new Map();
const queue = new Set([rootNode]);
for (const node of queue) {
if (node.active && node !== rootNode) continue;
if (node.value) {
if (Array.isArray(node.value)) {
for (const item of node.value) {
map.set(item, node.filePath);
}
} else {
map.set(node.value, node.filePath);
}
}
if (node.children) {
for (const child of node.children) {
queue.add(child);
}
}
}
newPlan.set(rootNode.filePath, map);
}
return newPlan;
};