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<?php
/**
* String handling methods.
*
* PHP versions 4 and 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs
* @since CakePHP(tm) v 1.2.0.5551
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

/**
* String handling methods.
*
*
* @package cake
* @subpackage cake.cake.libs
*/
class String {

/**
* Generate a random UUID
*
* @see http://www.ietf.org/rfc/rfc4122.txt
* @return RFC 4122 UUID
* @static
*/
function uuid() {
$node = env('SERVER_ADDR');
$pid = null;

if (strpos($node, ':') !== false) {
if (substr_count($node, '::')) {
$node = str_replace(
'::', str_repeat(':0000', 8 - substr_count($node, ':')) . ':', $node
);
}
$node = explode(':', $node) ;
$ipv6 = '' ;

foreach ($node as $id) {
$ipv6 .= str_pad(base_convert($id, 16, 2), 16, 0, STR_PAD_LEFT);
}
$node = base_convert($ipv6, 2, 10);

if (strlen($node) < 38) {
$node = null;
} else {
$node = crc32($node);
}
} elseif (empty($node)) {
$host = env('HOSTNAME');

if (empty($host)) {
$host = env('HOST');
}

if (!empty($host)) {
$ip = gethostbyname($host);

if ($ip === $host) {
$node = crc32($host);
} else {
$node = ip2long($ip);
}
}
} elseif ($node !== '127.0.0.1') {
$node = ip2long($node);
} else {
$node = null;
}

if (empty($node)) {
$node = crc32(Configure::read('Security.salt'));
}

if (function_exists('zend_thread_id')) {
$pid = zend_thread_id();
} else {
$pid = getmypid();
}

if (!$pid || $pid > 65535) {
$pid = mt_rand(0, 0xfff) | 0x4000;
}

list($timeMid, $timeLow) = explode(' ', microtime());
$uuid = sprintf(
"%08x-%04x-%04x-%02x%02x-%04x%08x", (int)$timeLow, (int)substr($timeMid, 2) & 0xffff,
mt_rand(0, 0xfff) | 0x4000, mt_rand(0, 0x3f) | 0x80, mt_rand(0, 0xff), $pid, $node
);

return $uuid;
}

/**
* Tokenizes a string using $separator, ignoring any instance of $separator that appears between
* $leftBound and $rightBound
*
* @param string $data The data to tokenize
* @param string $separator The token to split the data on.
* @param string $leftBound The left boundary to ignore separators in.
* @param string $rightBound The right boundary to ignore separators in.
* @return array Array of tokens in $data.
* @access public
* @static
*/
function tokenize($data, $separator = ',', $leftBound = '(', $rightBound = ')') {
if (empty($data) || is_array($data)) {
return $data;
}

$depth = 0;
$offset = 0;
$buffer = '';
$results = array();
$length = strlen($data);
$open = false;

while ($offset <= $length) {
$tmpOffset = -1;
$offsets = array(
strpos($data, $separator, $offset),
strpos($data, $leftBound, $offset),
strpos($data, $rightBound, $offset)
);
for ($i = 0; $i < 3; $i++) {
if ($offsets[$i] !== false && ($offsets[$i] < $tmpOffset || $tmpOffset == -1)) {
$tmpOffset = $offsets[$i];
}
}
if ($tmpOffset !== -1) {
$buffer .= substr($data, $offset, ($tmpOffset - $offset));
if ($data{$tmpOffset} == $separator && $depth == 0) {
$results[] = $buffer;
$buffer = '';
} else {
$buffer .= $data{$tmpOffset};
}
if ($leftBound != $rightBound) {
if ($data{$tmpOffset} == $leftBound) {
$depth++;
}
if ($data{$tmpOffset} == $rightBound) {
$depth--;
}
} else {
if ($data{$tmpOffset} == $leftBound) {
if (!$open) {
$depth++;
$open = true;
} else {
$depth--;
$open = false;
}
}
}
$offset = ++$tmpOffset;
} else {
$results[] = $buffer . substr($data, $offset);
$offset = $length + 1;
}
}
if (empty($results) && !empty($buffer)) {
$results[] = $buffer;
}

if (!empty($results)) {
$data = array_map('trim', $results);
} else {
$data = array();
}
return $data;
}

/**
* Replaces variable placeholders inside a $str with any given $data. Each key in the $data array
* corresponds to a variable placeholder name in $str.
* Example: `String::insert(':name is :age years old.', array('name' => 'Bob', '65'));`
* Returns: Bob is 65 years old.
*
* Available $options are:
*
* - before: The character or string in front of the name of the variable placeholder (Defaults to `:`)
* - after: The character or string after the name of the variable placeholder (Defaults to null)
* - escape: The character or string used to escape the before character / string (Defaults to `\`)
* - format: A regex to use for matching variable placeholders. Default is: `/(?<!\\)\:%s/`
* (Overwrites before, after, breaks escape / clean)
* - clean: A boolean or array with instructions for String::cleanInsert
*
* @param string $str A string containing variable placeholders
* @param string $data A key => val array where each key stands for a placeholder variable name
* to be replaced with val
* @param string $options An array of options, see description above
* @return string
* @access public
* @static
*/
function insert($str, $data, $options = array()) {
$defaults = array(
'before' => ':', 'after' => null, 'escape' => '\\', 'format' => null, 'clean' => false
);
$options += $defaults;
$format = $options['format'];
$data = (array)$data;
if (empty($data)) {
return ($options['clean']) ? String::cleanInsert($str, $options) : $str;
}

if (!isset($format)) {
$format = sprintf(
'/(?<!%s)%s%%s%s/',
preg_quote($options['escape'], '/'),
str_replace('%', '%%', preg_quote($options['before'], '/')),
str_replace('%', '%%', preg_quote($options['after'], '/'))
);
}

if (strpos($str, '?') !== false && is_numeric(key($data))) {
$offset = 0;
while (($pos = strpos($str, '?', $offset)) !== false) {
$val = array_shift($data);
$offset = $pos + strlen($val);
$str = substr_replace($str, $val, $pos, 1);
}
return ($options['clean']) ? String::cleanInsert($str, $options) : $str;
} else {
asort($data);

$hashKeys = array();
foreach ($data as $key => $value) {
$hashKeys[] = crc32($key);
}

$tempData = array_combine(array_keys($data), array_values($hashKeys));
krsort($tempData);
foreach ($tempData as $key => $hashVal) {
$key = sprintf($format, preg_quote($key, '/'));
$str = preg_replace($key, $hashVal, $str);
}
$dataReplacements = array_combine($hashKeys, array_values($data));
foreach ($dataReplacements as $tmpHash => $tmpValue) {
$tmpValue = (is_array($tmpValue)) ? '' : $tmpValue;
$str = str_replace($tmpHash, $tmpValue, $str);
}
}

if (!isset($options['format']) && isset($options['before'])) {
$str = str_replace($options['escape'].$options['before'], $options['before'], $str);
}
return ($options['clean']) ? String::cleanInsert($str, $options) : $str;
}

/**
* Cleans up a String::insert() formated string with given $options depending on the 'clean' key in
* $options. The default method used is text but html is also available. The goal of this function
* is to replace all whitespace and uneeded markup around placeholders that did not get replaced
* by String::insert().
*
* @param string $str
* @param string $options
* @return string
* @access public
* @static
* @see String::insert()
*/
function cleanInsert($str, $options) {
$clean = $options['clean'];
if (!$clean) {
return $str;
}
if ($clean === true) {
$clean = array('method' => 'text');
}
if (!is_array($clean)) {
$clean = array('method' => $options['clean']);
}
switch ($clean['method']) {
case 'html':
$clean = array_merge(array(
'word' => '[\w,.]+',
'andText' => true,
'replacement' => '',
), $clean);
$kleenex = sprintf(
'/[\s]*[a-z]+=(")(%s%s%s[\s]*)+\\1/i',
preg_quote($options['before'], '/'),
$clean['word'],
preg_quote($options['after'], '/')
);
$str = preg_replace($kleenex, $clean['replacement'], $str);
if ($clean['andText']) {
$options['clean'] = array('method' => 'text');
$str = String::cleanInsert($str, $options);
}
break;
case 'text':
$clean = array_merge(array(
'word' => '[\w,.]+',
'gap' => '[\s]*(?:(?:and|or)[\s]*)?',
'replacement' => '',
), $clean);

$kleenex = sprintf(
'/(%s%s%s%s|%s%s%s%s)/',
preg_quote($options['before'], '/'),
$clean['word'],
preg_quote($options['after'], '/'),
$clean['gap'],
$clean['gap'],
preg_quote($options['before'], '/'),
$clean['word'],
preg_quote($options['after'], '/')
);
$str = preg_replace($kleenex, $clean['replacement'], $str);
break;
}
return $str;
}
}
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