Method _createDeletionChangeset

src/node/utils/padDiff.ts:239–453

(cs: any, startAText: any, apool: any)

    return pack(unpacked.oldLen, unpacked.newLen, assem.toString(), unpacked.charBank);
  }
  _createDeletionChangeset(cs: any, startAText: any, apool: any){
    const lines = splitTextLines(startAText.text);
    const alines = splitAttributionLines(startAText.attribs, startAText.text);

    // lines and alines are what the exports is meant to apply to.
    // They may be arrays or objects with .get(i) and .length methods.
    // They include final newlines on lines.

    const linesGet = (idx: number) => {
      // @ts-ignore
      if (lines.get) {
        // @ts-ignore
        return lines.get(idx);
      } else {
        // @ts-ignore
        return lines[idx];
      }
    };

    const aLinesGet = (idx: number) => {
      // @ts-ignore
      if (alines.get) {
        // @ts-ignore
        return alines.get(idx);
      } else {
        return alines[idx];
      }
    };

    let curLine = 0;
    let curChar = 0;
    let curLineOps: { next: () => any; } | null = null;
    let curLineOpsNext: { done: any; value: any; } | null = null;
    let curLineOpsLine: number;
    let curLineNextOp = new Op('+');

    const unpacked = unpack(cs);
    const builder = new Builder(unpacked.newLen);

    const consumeAttribRuns = (numChars: number, func: Function /* (len, attribs, endsLine)*/) => {
      if (!curLineOps || curLineOpsLine !== curLine) {
        curLineOps = deserializeOps(aLinesGet(curLine));
        curLineOpsNext = curLineOps!.next();
        curLineOpsLine = curLine;
        let indexIntoLine = 0;
        while (!curLineOpsNext!.done) {
          curLineNextOp = curLineOpsNext!.value;
          curLineOpsNext = curLineOps!.next();
          if (indexIntoLine + curLineNextOp.chars >= curChar) {
            curLineNextOp.chars -= (curChar - indexIntoLine);
            break;
          }
          indexIntoLine += curLineNextOp.chars;
        }
      }

      while (numChars > 0) {
        if (!curLineNextOp.chars && curLineOpsNext!.done) {