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