diceware/wordlist/create-wordlist.php

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#!/usr/bin/env php
<?php
/**
* This script creates the Javascript code with the wordlist based on
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* the 1/3 most used words in English, found at http://norvig.com/ngrams/
*
*/
if (php_sapi_name() != "cli") {
print "This script can only be run from the command line!\n";
exit(1);
}
/**
* Print out syntax and exit.
*/
function printSyntax($progname) {
print "Syntax: $progname [ --dice n ]\n\n"
. "\t--dice Number of dice to generate a wordlist for. Must be between 5 and 7 inclusive. Defaults to 5.\n"
. "\n"
;
exit(1);
} // End of printSyntax()
/**
* Parse our arguments.
*
* @param array $argv Our command line arguments
*
* @return array An associative array of whatever we parsed out.
*/
function parseArgs($argv) {
$retval = array();
$progname = array_shift($argv);
while ($value = array_shift($argv)) {
$value_next = "";
if (isset($argv[0])) {
$value_next = $argv[0];
}
if ($value == "-h" || $value == "--help") {
printSyntax($progname);
}
if ($value == "--dice") {
$retval["dice"] = $value_next;
}
}
if ($retval["dice"] < 5 || $retval["dice"] > 7) {
printSyntax($progname);
}
return($retval);
} // End of parseArgs()
/**
* Read in our wordlist from Google and return an array with all words that
* passed validation.
*
* @param string $filename The filename
*
* @param integer $dice How many dice rolls to make? This number will
* be between 5 and 8, inclusive.
*
* @return array An array of words
*
*/
function readWordListPeterNorvig($filename, $dice) {
$retval = array();
$fp = @fopen($filename, "r");
if (!$fp) {
throw new Exception("Could not open '$filename' for reading");
}
$count = 0;
$max_count = array(
5 => 7776,
6 => 46656,
7 => 279936,
//8 => 1679616, // Can't do this with only 1/3rd million words ATM.
);
//
// We will tweak acceptable word length based on the number of
// dice we are rolling so we get enough words.
//
$word_lengths = array(
5 => array("min" => 4, "max" => 7),
6 => array("min" => 5, "max" => 6),
7 => array("min" => 4, "max" => 11),
);
while ($line = fgets($fp)) {
$line = rtrim($line);
list($word, $freq) = explode("\t", $line);
$len = strlen($word);
if ($len < $word_lengths[$dice]["min"] || $len > $word_lengths[$dice]["max"]) {
continue;
}
$retval[] = $word;
$count++;
if ($count > $max_count[$dice]) {
break;
}
}
//
// Put the words in alphabetical order for my own sanity.
//
sort($retval);
fclose($fp);
return($retval);
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} // End of readWordListPeterNorvig()
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/**
* Create our Javascript, but as an array
*
* @param array $words Our array of words
*
* @return string Javascript which defines an array of those words
*/
function getJsArray($words) {
$retval = ""
. "//\n"
. "// Our wordlist.\n"
. "//\n"
. "// Originally obtained from http://norvig.com/ngrams/\n"
. "//\n"
. "var wordlist = [\n"
;
$beenhere = false;
foreach ($words as $key => $value) {
if ($beenhere) {
$retval .= ",\n";
}
$retval .= "\t\"${value}\"";
$beenhere = true;
}
$retval .= "\n"
. "];\n"
. "\n"
;
return($retval);
} // End of getJsArray()
/**
* Our main entry point.
*/
function main($argv) {
$params = parseArgs($argv);
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//
// Read our file
//
$filename = "count_1w.txt";
$words = readWordListPeterNorvig($filename, $params["dice"]);
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//print_r($words); // Debugging
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//
// Get our Javascript
//
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$js = getJsArray($words);
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print $js;
} // End of main()
main($argv);