export 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; } } //# 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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":""}