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/*** module: node_modules/absol-acomp/js/tokenizeiput/TIHistory.js ***/
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

/***
 * @param {TokenizeInput} elt
 * @constructor
 */
function TIHistory(elt) {
  this.elt = elt;
  this.stack = [];
  this.topIdx = -1;
}

TIHistory.prototype.commit = function (text, offset) {
  while (this.topIdx < this.stack.length - 1) {
    this.stack.pop();
  }

  var lastText = this.stack.length > 0 ? this.stack[this.stack.length - 1].text : null;

  if (text === lastText) {
    if (this.stack[this.stack.length - 1].offset !== offset) this.stack[this.stack.length - 1].offset = offset;
  } else {
    this.topIdx = this.stack.length;
    var record = {
      text: text,
      offset: offset
    };
    this.stack.push(record);
    this.elt.emit('change', {
      target: this,
      value: record.text,
      action: 'commit',
      record: record,
      type: 'change'
    }, this);
  }
};

TIHistory.prototype.undo = function () {
  if (this.topIdx <= 0) return;
  this.topIdx--;
  var record = this.stack[this.topIdx];
  this.elt.applyData(record.text, record.offset);
  this.elt.emit('change', {
    target: this,
    value: record.text,
    action: 'undo',
    record: record,
    type: 'change'
  }, this);
};

TIHistory.prototype.redo = function () {
  if (this.topIdx + 1 >= this.stack.length) return;
  this.topIdx++;
  var record = this.stack[this.topIdx];
  this.elt.applyData(record.text, record.offset);
  this.elt.emit('change', {
    target: this,
    value: record.text,
    action: 'redo',
    record: record,
    type: 'change'
  }, this);
};

var _default = TIHistory;
exports.default = _default;