Text Statistics Counter

Counts, characters, words, sentences and paragraphs.

by plantface

JavaScript

var text = 'This is a paragraph. This is the 2nd sentence in the 1st paragraph.\nThis is another paragraph.';
var count = doCount(text);

document.body.innerHTML = '<pre>' + text + '</pre><hr>';
for (i in count) {
	document.body.innerHTML += '<p>'+ i +': ' + count[i] + '</p>';
}

/* COUNTING LIBRARY */

/**
 * Extracted from https://github.com/RadLikeWhoa/Countable/, which in 
 * turn uses `ucs2decode` function from the punycode.js library.
 */
function doCount(original) {
    var trimmed = original.replace(/[\u200B]+/, '').trim();

    return {
        paragraphs: trimmed ? (trimmed.match(/\n+/g) || []).length + 1 : 0,
        sentences: trimmed ? (trimmed.match(/[.?!…\n]+./g) || []).length + 1 : 0,
        words: trimmed ? (trimmed.replace(/['";:,.?¿\-!¡]+/g, '').match(/\S+/g) || []).length : 0,
        characters: trimmed ? _decode(trimmed.replace(/\s/g, '')).length : 0,
        all: _decode(original).length
    };
};

/**
 * `ucs2decode` function from the punycode.js library.
 *
 * Creates an array containing the decimal code points of each Unicode
 * character in the string. While JavaScript uses UCS-2 internally, this
 * function will convert a pair of surrogate halves (each of which UCS-2
 * exposes as separate characters) into a single code point, matching
 * UTF-16.
 *
 * @see     <http://goo.gl/8M09r>
 * @see     <http://goo.gl/u4UUC>
 *
 * @param   {String}  string   The Unicode input string (UCS-2).
 *
 * @return  {Array}   The new array of code points.
 */
function _decode(string) {
    var output = [],
        counter = 0,
        length = string.length,
        value, extra;

    while (counter < length) {
        value = string.charCodeAt(counter++);

        if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
            // High surrogate, and there is a next character.
            extra = string.charCodeAt(counter++);

            if ((extra & 0xFC00) === 0xDC00) {
                // Low surrogate.
                output.push(((value &...