140 lines
16 KiB
JavaScript
140 lines
16 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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class RangeTree {
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constructor(start, end, delta, children) {
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this.start = start;
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this.end = end;
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this.delta = delta;
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this.children = children;
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}
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/**
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* @precodition `ranges` are well-formed and pre-order sorted
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*/
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static fromSortedRanges(ranges) {
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let root;
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// Stack of parent trees and parent counts.
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const stack = [];
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for (const range of ranges) {
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const node = new RangeTree(range.startOffset, range.endOffset, range.count, []);
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if (root === undefined) {
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root = node;
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stack.push([node, range.count]);
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continue;
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}
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let parent;
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let parentCount;
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while (true) {
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[parent, parentCount] = stack[stack.length - 1];
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// assert: `top !== undefined` (the ranges are sorted)
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if (range.startOffset < parent.end) {
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break;
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}
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else {
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stack.pop();
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}
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}
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node.delta -= parentCount;
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parent.children.push(node);
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stack.push([node, range.count]);
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}
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return root;
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}
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normalize() {
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const children = [];
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let curEnd;
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let head;
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const tail = [];
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for (const child of this.children) {
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if (head === undefined) {
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head = child;
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}
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else if (child.delta === head.delta && child.start === curEnd) {
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tail.push(child);
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}
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else {
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endChain();
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head = child;
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}
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curEnd = child.end;
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}
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if (head !== undefined) {
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endChain();
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}
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if (children.length === 1) {
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const child = children[0];
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if (child.start === this.start && child.end === this.end) {
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this.delta += child.delta;
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this.children = child.children;
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// `.lazyCount` is zero for both (both are after normalization)
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return;
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}
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}
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this.children = children;
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function endChain() {
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if (tail.length !== 0) {
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head.end = tail[tail.length - 1].end;
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for (const tailTree of tail) {
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for (const subChild of tailTree.children) {
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subChild.delta += tailTree.delta - head.delta;
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head.children.push(subChild);
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}
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}
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tail.length = 0;
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}
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head.normalize();
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children.push(head);
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}
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}
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/**
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* @precondition `tree.start < value && value < tree.end`
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* @return RangeTree Right part
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*/
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split(value) {
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let leftChildLen = this.children.length;
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let mid;
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// TODO(perf): Binary search (check overhead)
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for (let i = 0; i < this.children.length; i++) {
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const child = this.children[i];
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if (child.start < value && value < child.end) {
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mid = child.split(value);
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leftChildLen = i + 1;
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break;
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}
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else if (child.start >= value) {
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leftChildLen = i;
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break;
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}
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}
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const rightLen = this.children.length - leftChildLen;
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const rightChildren = this.children.splice(leftChildLen, rightLen);
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if (mid !== undefined) {
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rightChildren.unshift(mid);
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}
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const result = new RangeTree(value, this.end, this.delta, rightChildren);
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this.end = value;
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return result;
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}
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/**
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* Get the range coverages corresponding to the tree.
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*
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* The ranges are pre-order sorted.
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*/
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toRanges() {
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const ranges = [];
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// Stack of parent trees and counts.
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const stack = [[this, 0]];
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while (stack.length > 0) {
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const [cur, parentCount] = stack.pop();
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const count = parentCount + cur.delta;
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ranges.push({ startOffset: cur.start, endOffset: cur.end, count });
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for (let i = cur.children.length - 1; i >= 0; i--) {
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stack.push([cur.children[i], count]);
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}
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}
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return ranges;
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}
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}
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exports.RangeTree = RangeTree;
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//# sourceMappingURL=data:application/json;charset=utf8;base64,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