read-more-react/dist/utils/trimText.js

A moderately intelligent truncation of text for react

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var PUNCTUATION_LIST = [".", ",", "!", "?", "'", "{", "}", "(", ")", "[", "]", "/"];

var trimText = function trimText(text) {
  var min = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 80;
  var ideal = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 100;
  var max = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 200;

  //This main function uses two pointers to move out from the ideal, to find the first instance of a punctuation mark followed by a space. If one cannot be found, it will go with the first space closest to the ideal.
  if (max < min || ideal > max || ideal < min) {
    throw new Error("The minimum length must be less than the maximum, and the ideal must be between the minimum and maximum.");
  }

  if (text.length < ideal) {
    return [text, ''];
  }

  var pointerOne = ideal;
  var pointerTwo = ideal;
  var firstSpace, resultIdx;

  var setSpace = function setSpace(idx) {
    if (spaceMatch(text[idx])) {
      firstSpace = firstSpace || idx;
    }
  };

  while (pointerOne < max || pointerTwo > min) {
    if (checkMatch(pointerOne, text, max, min)) {
      resultIdx = pointerOne + 1;
      break;
    } else if (checkMatch(pointerTwo, text, max, min)) {
      resultIdx = pointerTwo + 1;
      break;
    } else {
      setSpace(pointerOne);
      setSpace(pointerTwo);
    }

    pointerOne++;
    pointerTwo--;
  }

  if (resultIdx === undefined) {
    if (firstSpace && firstSpace >= min && firstSpace <= max) {
      resultIdx = firstSpace;
    } else if (ideal - min < max - ideal) {
      resultIdx = min;
    } else {
      resultIdx = max;
    }
  }

  return [text.slice(0, resultIdx), text.slice(resultIdx).trim()];
};

var spaceMatch = function spaceMatch(character) {
  if (character === " ") {
    return true;
  }
};

var punctuationMatch = function punctuationMatch(idx, text) {
  var punctuationIdx = PUNCTUATION_LIST.indexOf(text[idx]);

  if (punctuationIdx >= 0 && spaceMatch(text[idx + 1])) {
    return true;
  }
};

var checkMatch = function checkMatch(idx, text, max, min) {
  if (idx < max && idx > min && punctuationMatch(idx, text)) {
    return true;
  }
};

var _default = trimText;
exports["default"] = _default;