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/*
* pwgen.js
*
* (c) Peter <i@peter.am> 2011
* Based on code of:
* KATO Kazuyoshi <kzys@8-p.info> http://8-p.info/pwgen/
* Frank4DD http://www.frank4dd.com/howto/various/pwgen.htm
*
* This program is a JavaScript port of pwgen.
* The original C source code written by Theodore Ts'o.
* <http://sourceforge.net/projects/pwgen/>
*
* This file may be distributed under the terms of the GNU General
* Public License.
*/
var pwgen_CONSONANT = 1;
var pwgen_VOWEL = (1 << 1);
var pwgen_DIPTHONG = (1 << 2);
var pwgen_NOT_FIRST = (1 << 3);
var pwgen_ELEMENTS = [
[ "a", pwgen_VOWEL ],
[ "ae", pwgen_VOWEL | pwgen_DIPTHONG ],
[ "ah", pwgen_VOWEL | pwgen_DIPTHONG ],
[ "ai", pwgen_VOWEL | pwgen_DIPTHONG ],
[ "b", pwgen_CONSONANT ],
[ "c", pwgen_CONSONANT ],
[ "ch", pwgen_CONSONANT | pwgen_DIPTHONG ],
[ "d", pwgen_CONSONANT ],
[ "e", pwgen_VOWEL ],
[ "ee", pwgen_VOWEL | pwgen_DIPTHONG ],
[ "ei", pwgen_VOWEL | pwgen_DIPTHONG ],
[ "f", pwgen_CONSONANT ],
[ "g", pwgen_CONSONANT ],
[ "gh", pwgen_CONSONANT | pwgen_DIPTHONG | pwgen_NOT_FIRST ],
[ "h", pwgen_CONSONANT ],
[ "i", pwgen_VOWEL ],
[ "ie", pwgen_VOWEL | pwgen_DIPTHONG ],
[ "j", pwgen_CONSONANT ],
[ "k", pwgen_CONSONANT ],
[ "l", pwgen_CONSONANT ],
[ "m", pwgen_CONSONANT ],
[ "n", pwgen_CONSONANT ],
[ "ng", pwgen_CONSONANT | pwgen_DIPTHONG | pwgen_NOT_FIRST ],
[ "o", pwgen_VOWEL ],
[ "oh", pwgen_VOWEL | pwgen_DIPTHONG ],
[ "oo", pwgen_VOWEL | pwgen_DIPTHONG],
[ "p", pwgen_CONSONANT ],
[ "ph", pwgen_CONSONANT | pwgen_DIPTHONG ],
[ "qu", pwgen_CONSONANT | pwgen_DIPTHONG],
[ "r", pwgen_CONSONANT ],
[ "s", pwgen_CONSONANT ],
[ "sh", pwgen_CONSONANT | pwgen_DIPTHONG],
[ "t", pwgen_CONSONANT ],
[ "th", pwgen_CONSONANT | pwgen_DIPTHONG],
[ "u", pwgen_VOWEL ],
[ "v", pwgen_CONSONANT ],
[ "w", pwgen_CONSONANT ],
[ "x", pwgen_CONSONANT ],
[ "y", pwgen_CONSONANT ],
[ "z", pwgen_CONSONANT ]
];
function pwgen_generate(pwlen, inc_capital, inc_number, inc_spec) {
var result = null;
while (! result)
result = pwgen_generate0(pwlen, inc_capital, inc_number, inc_spec);
return result;
}
function pwgen_generate0(pwlen, inc_capital, inc_number, inc_spec) {
var result = "";
var prev = 0;
var isFirst = true;
var shouldBe = (gen_rand0() < 0.5) ? pwgen_VOWEL : pwgen_CONSONANT;
while (result.length < pwlen) {
i = Math.floor((pwgen_ELEMENTS.length - 1) * gen_rand0());
str = pwgen_ELEMENTS[i][0];
flags = pwgen_ELEMENTS[i][1];
/* Filter on the basic type of the next element */
if ((flags & shouldBe) == 0) {
continue;
}
/* Handle the NOT_FIRST flag */
if (isFirst && (flags & pwgen_NOT_FIRST)) {
continue;
}
/* Don't allow VOWEL followed a Vowel/Dipthong pair */
if ((prev & pwgen_VOWEL) && (flags & pwgen_VOWEL) && (flags & pwgen_DIPTHONG)) {
continue;
}
/* Don't allow us to overflow the buffer */
if ( (result.length + str.length) > pwlen) {
continue;
}
if (inc_capital) {
if ((isFirst || (flags & pwgen_CONSONANT)) &&
(gen_rand0() > 0.3)) {
str = str.slice(0, 1).toUpperCase() + str.slice(1, str.length);
inc_capital = false;
}
}
/*
* OK, we found an element which matches our criteria,
* let's do it!
*/
result += str;
if (inc_number) {
if (!isFirst && (gen_rand0() < 0.3)) {
if ( (result.length + str.length) > pwlen)
result = result.slice(0,-1);
result += Math.floor(10 * gen_rand0()).toString();
inc_number = false;
isFirst = true;
prev = 0;
shouldBe = (gen_rand0() < 0.5) ? pwgen_VOWEL : pwgen_CONSONANT;
continue;
}
}
if (inc_spec) {
if (!isFirst && (gen_rand0() < 0.3)) {
if ( (result.length + str.length) > pwlen)
result = result.slice(0,-1);
var possible = genpas_spec_symbols;
result += possible.charAt(Math.floor(gen_rand0() * possible.length));
inc_spec = false;
isFirst = true;
prev = 0;
shouldBe = (gen_rand0() < 0.5) ? pwgen_VOWEL : pwgen_CONSONANT;
continue;
}
}
/*
* OK, figure out what the next element should be
*/
if (shouldBe == pwgen_CONSONANT) {
shouldBe = pwgen_VOWEL;
} else { /* should_be == VOWEL */
if ((prev & pwgen_VOWEL) ||
(flags & pwgen_DIPTHONG) || (gen_rand0() > 0.3)) {
shouldBe = pwgen_CONSONANT;
} else {
shouldBe = pwgen_VOWEL;
}
}
prev = flags;
isFirst = false;
}
if (inc_capital || inc_number || inc_spec)
return null;
return result;
}
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