string-punctuation-tokenizer/lib/selectionHelpers.js

Small library that provides functions to tokenize a string into an array of words with or without punctuation

"use strict";

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

var _occurrences = require("./occurrences");

/**
 * Splice string into array of ranges, flagging what is selected
 * @param {String} string - string.
 * @param {Array} ranges - array of ranges [[int,int],...]
 * @return {Array} - array of objects [obj,...]
 */
var spliceStringOnRanges = function spliceStringOnRanges(string, ranges) {
  var selectionArray = []; // response

  var remainingString = string; // shift the range since the loop is destructive by working on the remainingString and not original string

  var rangeShift = 0; // start the range shift at the first character

  ranges.forEach(function (range) {
    var firstCharacterPosition = range[0] - rangeShift; // original range start - the rangeShift

    var beforeSelection = remainingString.slice(0, firstCharacterPosition); // save all the text before the selection

    if (beforeSelection) {
      // only add to the array if string isn't empty
      selectionArray.push({
        text: beforeSelection,
        selected: false
      });
    }

    var shiftedRangeStart = range[0] - rangeShift; // range start - the rangeShift

    var shiftedRangeEnd = range[1] + 1 - rangeShift; // range end - rangeShift + 1 to include last character

    var selection = remainingString.slice(shiftedRangeStart, shiftedRangeEnd); // save the text in the selection

    var stringBeforeRange = string.slice(0, range[0]);
    var occurrence = (0, _occurrences.occurrencesInString)(stringBeforeRange, selection) + 1;
    var occurrences = (0, _occurrences.occurrencesInString)(string, selection);
    var selectionObject = {
      text: selection,
      selected: true,
      occurrence: occurrence,
      occurrences: occurrences
    };
    selectionArray.push(selectionObject); // add the selection to the response array
    // next iteration is using remaining string

    var lastCharacterPosition = range[1] - rangeShift + 1; // original range end position - the rangeShift + 1 to not include the last range character in the remaining string

    remainingString = remainingString.slice(lastCharacterPosition); // update the remainingString to after the range
    // shift the range up to last char of substring (before+sub)

    rangeShift += beforeSelection.length; // adjust the rangeShift by the length prior to the selection

    rangeShift += selection.length; // adjust the rangeShift by the length of the selection itself
  });

  if (remainingString) {
    // only add to the array if string isn't empty
    selectionArray.push({
      text: remainingString,
      selected: false
    });
  }

  return selectionArray;
};
/**
 * Converts ranges to array of selection objects
 * @param {String} string - text used to get the ranges of
 * @param {Array} selections - array of selections [obj,...]
 * @return {Array} - array of range objects
 */


exports.spliceStringOnRanges = spliceStringOnRanges;

var selectionsToRanges = function selectionsToRanges(string, selections) {
  var ranges = []; // response

  selections.forEach(function (selection) {
    if (string && string.includes(selection.text)) {
      // conditions to prevent errors
      var splitArray = string.split(selection.text); // split the string to get the text between occurrences

      var beforeSelection = splitArray.slice(0, selection.occurrence);
      beforeSelection = beforeSelection.join(selection.text); // get the text before the selection to handle multiple occurrences

      var start = beforeSelection.length; // the start position happens at the length of the string that comes before it

      var end = start + selection.text.length - 1; // the end position happens at the end of the selection text, but length doesn't account for 0 based position start

      var range = [start, end]; // new range

      ranges.push(range); // add the new range
    }
  });
  return ranges;
};

exports.selectionsToRanges = selectionsToRanges;

var selectionArray = function selectionArray(string, selections) {
  var selectionArray = [];
  var ranges = selectionsToRanges(string, selections);
  selectionArray = spliceStringOnRanges(string, ranges);
  return selectionArray;
};

exports.selectionArray = selectionArray;
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// response\n  let remainingString = string;\n  // shift the range since the loop is destructive by working on the remainingString and not original string\n  let rangeShift = 0; // start the range shift at the first character\n  ranges.forEach(function(range) {\n    const firstCharacterPosition = range[0]-rangeShift; // original range start - the rangeShift\n    const beforeSelection = remainingString.slice(0, firstCharacterPosition); // save all the text before the selection\n    if (beforeSelection) { // only add to the array if string isn't empty\n      selectionArray.push({text: beforeSelection, selected: false});\n    }\n    const shiftedRangeStart = range[0]-rangeShift; // range start - the rangeShift\n    const shiftedRangeEnd = range[1]+1-rangeShift; // range end - rangeShift + 1 to include last character\n    const selection = remainingString.slice(shiftedRangeStart, shiftedRangeEnd); // save the text in the selection\n    const stringBeforeRange = string.slice(0, range[0]);\n    const occurrence = occurrencesInString(stringBeforeRange, selection) + 1;\n    const occurrences = occurrencesInString(string, selection);\n    const selectionObject = {\n      text: selection,\n      selected: true,\n      occurrence: occurrence,\n      occurrences: occurrences,\n    };\n    selectionArray.push(selectionObject); // add the selection to the response array\n    // next iteration is using remaining string\n    const lastCharacterPosition = range[1]-rangeShift+1; // original range end position - the rangeShift + 1 to not include the last range character in the remaining string\n    remainingString = remainingString.slice(lastCharacterPosition); // update the remainingString to after the range\n    // shift the range up to last char of substring (before+sub)\n    rangeShift += beforeSelection.length; // adjust the rangeShift by the length prior to the selection\n    rangeShift += selection.length; // adjust the rangeShift by the length of the selection itself\n  });\n  if (remainingString) { // only add to the array if string isn't empty\n    selectionArray.push({text: remainingString, selected: false});\n  }\n  return selectionArray;\n};\n/**\n * Converts ranges to array of selection objects\n * @param {String} string - text used to get the ranges of\n * @param {Array} selections - array of selections [obj,...]\n * @return {Array} - array of range objects\n */\nexport const selectionsToRanges = (string, selections) => {\n  let ranges = []; // response\n    selections.forEach( (selection) => {\n      if (string && string.includes(selection.text)) { // conditions to prevent errors\n        const splitArray = string.split(selection.text); // split the string to get the text between occurrences\n        let beforeSelection = splitArray.slice(0, selection.occurrence);\n        beforeSelection = beforeSelection.join(selection.text); // get the text before the selection to handle multiple occurrences\n        const start = beforeSelection.length; // the start position happens at the length of the string that comes before it\n        const end = start + selection.text.length - 1; // the end position happens at the end of the selection text, but length doesn't account for 0 based position start\n        const range = [start, end]; // new range\n        ranges.push(range); // add the new range\n      }\n    });\n  return ranges;\n};\n\nexport const selectionArray = (string, selections) => {\n  let selectionArray = [];\n  let ranges = selectionsToRanges(string, selections);\n  selectionArray = spliceStringOnRanges(string, ranges);\n  return selectionArray;\n};\n"]}