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JavaScript Lorem Ipsum Generator
/**
* @fileOverview Generates "Lorem ipsum" style text.
* @author rviscomi@gmail.com Rick Viscomi,
* tinsley@tinsology.net Mathew Tinsley
* @version 1.0
*/
/**
* Copyright (c) 2009, Mathew Tinsley (tinsley@tinsology.net)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the organization nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY MATHEW TINSLEY ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @class Jibborish generator.
*/
var LoremIpsum = function () {
};
/**
* Average number of words per sentence.
* @constant {number}
*/
LoremIpsum.WORDS_PER_SENTENCE_AVG = 24.460;
/**
* Standard deviation of the number of words per sentence.
* @constant {number}
*/
LoremIpsum.WORDS_PER_SENTENCE_STD = 5.080;
/**
* List of possible words.
* @constant {Array.string}
*/
LoremIpsum.WORDS = [
'lorem', 'ipsum', 'dolor', 'sit', 'amet', 'consectetur',
'adipiscing', 'elit', 'curabitur', 'vel', 'hendrerit', 'libero',
'eleifend', 'blandit', 'nunc', 'ornare', 'odio', 'ut',
'orci', 'gravida', 'imperdiet', 'nullam', 'purus', 'lacinia',
'a', 'pretium', 'quis', 'congue', 'praesent', 'sagittis',
'laoreet', 'auctor', 'mauris', 'non', 'velit', 'eros',
'dictum', 'proin', 'accumsan', 'sapien', 'nec', 'massa',
'volutpat', 'venenatis', 'sed', 'eu', 'molestie', 'lacus',
'quisque', 'porttitor', 'ligula', 'dui', 'mollis', 'tempus',
'at', 'magna', 'vestibulum', 'turpis', 'ac', 'diam',
'tincidunt', 'id', 'condimentum', 'enim', 'sodales', 'in',
'hac', 'habitasse', 'platea', 'dictumst', 'aenean', 'neque',
'fusce', 'augue', 'leo', 'eget', 'semper', 'mattis',
'tortor', 'scelerisque', 'nulla', 'interdum', 'tellus', 'malesuada',
'rhoncus', 'porta', 'sem', 'aliquet', 'et', 'nam',
'suspendisse', 'potenti', 'vivamus', 'luctus', 'fringilla', 'erat',
'donec', 'justo', 'vehicula', 'ultricies', 'varius', 'ante',
'primis', 'faucibus', 'ultrices', 'posuere', 'cubilia', 'curae',
'etiam', 'cursus', 'aliquam', 'quam', 'dapibus', 'nisl',
'feugiat', 'egestas', 'class', 'aptent', 'taciti', 'sociosqu',
'ad', 'litora', 'torquent', 'per', 'conubia', 'nostra',
'inceptos', 'himenaeos', 'phasellus', 'nibh', 'pulvinar', 'vitae',
'urna', 'iaculis', 'lobortis', 'nisi', 'viverra', 'arcu',
'morbi', 'pellentesque', 'metus', 'commodo', 'ut', 'facilisis',
'felis', 'tristique', 'ullamcorper', 'placerat', 'aenean', 'convallis',
'sollicitudin', 'integer', 'rutrum', 'duis', 'est', 'etiam',
'bibendum', 'donec', 'pharetra', 'vulputate', 'maecenas', 'mi',
'fermentum', 'consequat', 'suscipit', 'aliquam', 'habitant', 'senectus',
'netus', 'fames', 'quisque', 'euismod', 'curabitur', 'lectus',
'elementum', 'tempor', 'risus', 'cras'
];
/**
* Generate "Lorem ipsum" style words.
* @param num_words {number} Number of words to generate.
* @return {string} "Lorem ipsum..."
*/
LoremIpsum.prototype.generate = function (num_words) {
var words, ii, position, word, current, sentences, sentence_length, sentence;
/**
* @default 100
*/
num_words = num_words || 100;
words = [LoremIpsum.WORDS[0], LoremIpsum.WORDS[1]];
num_words -= 2;
for (ii = 0; ii < num_words; ii++) {
position = Math.floor(Math.random() * LoremIpsum.WORDS.length);
word = LoremIpsum.WORDS[position];
if (ii > 0 && words[ii - 1] === word) {
ii -= 1;
} else {
words[ii] = word;
}
}
sentences = [];
current = 0;
while (num_words > 0) {
sentence_length = this.getRandomSentenceLength();
if (num_words - sentence_length < 4) {
sentence_length = num_words;
}
num_words -= sentence_length;
sentence = [];
for (ii = current; ii < (current + sentence_length); ii++) {
sentence.push(words[ii]);
}
sentence = this.punctuate(sentence);
current += sentence_length;
sentences.push(sentence.join(' '));
}
return sentences.join(' ');
};
/**
* Insert commas and periods in the given sentence.
* @param {Array.string} sentence List of words in the sentence.
* @return {Array.string} Sentence with punctuation added.
*/
LoremIpsum.prototype.punctuate = function (sentence) {
var word_length, num_commas, ii, position;
word_length = sentence.length;
/* End the sentence with a period. */
sentence[word_length - 1] += '.';
if (word_length < 4) {
return sentence;
}
num_commas = this.getRandomCommaCount(word_length);
for (ii = 0; ii <= num_commas; ii++) {
position = Math.round(ii * word_length / (num_commas + 1));
if (position < (word_length - 1) && position > 0) {
/* Add the comma. */
sentence[position] += ',';
}
}
/* Capitalize the first word in the sentence. */
sentence[0] = sentence[0].charAt(0).toUpperCase() + sentence[0].slice(1);
return sentence;
};
/**
* Produces a random number of commas.
* @param {number} word_length Number of words in the sentence.
* @return {number} Random number of commas
*/
LoremIpsum.prototype.getRandomCommaCount = function (word_length) {
var base, average, standard_deviation;
/* Arbitrary. */
base = 6;
average = Math.log(word_length) / Math.log(base);
standard_deviation = average / base;
return Math.round(this.gaussMS(average, standard_deviation));
};
/**
* Produces a random sentence length based on the average word length
* of an English sentence.
* @return {number} Random sentence length
*/
LoremIpsum.prototype.getRandomSentenceLength = function () {
return Math.round(
this.gaussMS(
LoremIpsum.WORDS_PER_SENTENCE_AVG,
LoremIpsum.WORDS_PER_SENTENCE_STD
)
);
};
/**
* Produces a random number.
* @return {number} Random number
*/
LoremIpsum.prototype.gauss = function () {
return (Math.random() * 2 - 1) +
(Math.random() * 2 - 1) +
(Math.random() * 2 - 1);
};
/**
* Produces a random number with Gaussian distribution.
* @param {number} mean
* @param {number} standard_deviation
* @return {number} Random number
*/
LoremIpsum.prototype.gaussMS = function (mean, standard_deviation) {
return Math.round(this.gauss() * standard_deviation + mean);
};
@rviscomi

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@rviscomi rviscomi commented Dec 15, 2011

Ported from Mathew Tinsley's PHP version for extensible JavaScript. Included JSDoc-style comments for easy documentation generation.

Usage:

/* Instantiate the generator object. */
lipsum = new LoremIpsum();

/* Generate 100 words in "Lorem ipsum..." style. */
blah = lipsum.generate(100);

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