Generate a summary

generateSummary.js

function mergeArr(arr1, arr2) {
    for (var i = 0; i < arr1.length; i++) {

        for (var j = 0; j < arr2.length; j++) {
            if (i !== j)
                continue;

            arr2[j] = arr1[i];
        }
    }

    return arr2;
}

function makeSummary(arr) {
    var count = 0;

    for (var i = 0; i < arr.length; i++) {

        if (arr[i] == 'N') {
            count++;
            arr[i] = count + '';

            continue;
        }

        if (arr[i].indexOf('.') > -1) {
            var newArr = [];
            var oldCount = 0;
            var arrX = arr[i].split('.');
            var arrOval = arr[i - 1].split('.');

            newArr = mergeArr(arrOval, arrX);

            if (arr[i - 1].length > arr[i].length) {
                var j = 1;

                for (j; j < arr.length; j++) {
                    if (arr[i - j].length === arr[i].length)
                        break;
                }

                var arrPreviousVal = arr[i - j].split('.');

                oldCount = parseInt(arrPreviousVal[arrPreviousVal.length - 1]);

                newArr[newArr.length - 1] = (oldCount + 1);

                arr[i] = newArr.join('.');

                continue;
            }

            if (arr[i - 1].length === arr[i].length) {
                oldCount = parseInt(arrOval[arrOval.length - 1]);

                newArr[newArr.length - 1] = (oldCount + 1);

                arr[i] = newArr.join('.');
            } else {
                arr[i] = makeSummary(newArr).join('.');
            }
        }

    }

    return arr;
}

String.prototype.contains = function(arg) {
    return this.indexOf(arg) > -1;
};

function getSumFromText(val) {
    var pos = 0;
    var aux = '';
    var arr = [];

    for (var i = 0; i < val.length; i++) {
        if (val[i] !== '[') 
            continue;

        aux = '';
        pos = i + 1;

        while (val[pos] !== ']') {
            aux += val[pos];
            pos++;
        }

        if ((aux.contains('N') && aux.length === 1) || aux.contains('N.'))
            arr.push(aux);
    }

    return arr;
}

function setSumToText(text, arr) {
    var pos = 0;
    var aux = '';
    var count = 0;
    var iniTxt = '';
    var endTxt = '';

    for (var i = 0; i < text.length; i++) {
        if (text[i] !== '[') 
            continue;

        aux = '';
        pos = i + 1;

        while (text[pos] !== ']') {
            aux += text[pos];
            pos++;
        }

        if ((aux.contains('N') && aux.length === 1) || aux.contains('N.')) {
            iniTxt = text.substring(0, i);
            endTxt = text.substring((pos + 1), text.length);

            text = iniTxt + arr[count] + endTxt;

            count++;
        }
    }

    return text;
}

function generateSummary(txt) {
    var arr = getSumFromText(txt);

    arr = makeSummary(arr);

    return setSumToText(txt, arr);
}

var txt = '[N] asdasdasdas [TECNICO] da [N.N] asdasdasd [N] weqweasdqweqweasd [N.N] weqwewqeq [N.N] asqweasdqwe ' +
            '[N.N.N] weqe qweq e [N.N] weqeasd a [N.N.N] weqweqwe qweqw  [N.N] eqweqweqwe qweqw [N] sada sdqwew qe [N.N]';

generateSummary(txt);