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<?php

/* @section Helper functions */

/**

 * Retrieves the value of an element of an associative array.

 *

 * This is designed for $_GET and other HTTP variables but

 * also works for common associative arrays.

 *

 * @param $key: string

 *   Key identifier.  The default is the empty string.

 * @param $array: string

 *   Array identifier.  The default is '_GET'.  If there is

 *   no such array, the identifier is prefixed with 'HTTP'

 *   and suffixed with '_VARS' (to support the deprecated

 *   HTTP_GET_VARS etc. arrays as of PHP < 4.1).  If

 *   there is still no array with that identifier, return

 *   the empty string.

 * @param $default: string

 *   Default return value if the element specified with

 *   $key is not available in the array.  The default

 *   is the empty string.

 * @return

 *   The value of the element of that array with that key or

 *   the empty string if there is no such element or array.

 * @author

 *  Copyright (C) 2004, 2005  Thomas Lahn <php@PointedEars.de>

 */

function getVars($key = '', $array = '_GET', $default = '', $noEntities = false)

{

  global ${$array};

  if (!isset(${'HTTP'.$array.'_VARS'})) global ${'HTTP'.$array.'_VARS'};

/*

  echo "<pre>getVars: \$$array"."['$key']: return '"

    .(isset(${$array}) && isset(${$array}[$key])

    ? ${$array}[$key]

    : (isset(${'HTTP'.$array.'_VARS'}) && isset(${'HTTP'.$array.'_VARS'}[$key])

       ? ${'HTTP'.$array.'_VARS'}[$key]

       : $default)) . "'</pre><br>\n";

*/

  $result = (isset(${$array}) && isset(${$array}[$key])

    ? ${$array}[$key]

    : (isset(${'HTTP'.$array.'_VARS'}) && isset(${'HTTP'.$array.'_VARS'}[$key])

       ? ${'HTTP'.$array.'_VARS'}[$key]

       : $default));

// TODO: Escape HTML entities

/*

  if (!$noEntities)

  {

    $result = htmlentities($result);

  }

*/

  return $result;

}

/**

 * Converts the argument to a visible (X)HTML hyperlink

 * where its URI target is created from the argument.

 * Supported are e-mail addresses, domain names with

 * optional paths, and valid URIs.

 *

 * @param $text

 *   Argument to be converted.

 * @return

 *   The converted argument if it applies to a supported

 *   scheme, the unconverted argument otherwise.

 *

 * @author (C) 2001-04-04T02:03

 *   mark.young@vdhinc.com at http://php.net/manual/en/ref.strings.php

 *

 * Minor correction to my HTMLEncode function.

 *

 * @author 2002-08-29T09:00

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Added target="_blank"

 * - Added support for ftp(s)-URIs: (ht|f)

 * - Added support for search strings (?...=...&...=...), either

 *   with or without HTML entities: \?=(&\w;|&)

 * - Removed enclosing nl2br call because of preformatted display

 *

 * @author 2003-12-30T14:18

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Removed target="_blank".

 * - Added PHPdoc.

 *

 * @author 2004-01-12T12:45

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Added support for #fragment_identifiers in URIs.

 * - Added support for bugs and comments.

 *

 * @author 2004-01-13T01:29

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Added support for bug aliases.

 *

 * @author 2004-01-26T20:43

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Do not convert URIs in A elements.

 * - Do not allow URIs with "&" before search-string.

 * - camelCased function identifier.  Only classes

 *   and constructors should start with uppercase.

 *

 * @author 2004-01-27T14:07

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Allow to convert URIs preceded by ">" but not followed by "</a>".

 * - Allow ";" to be part of the search string

 *

 * @author 2004-01-29T14:10

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Require valid domain name for "bar" on conversion of "foo@bar" and

 *   "www.bar".

 * - Be case-insensitive except of bug aliases

 * - Escaped "-" in character classes if not meant as range metacharacter.

 * - Corrected year.

 *

 * @author 2004-02-14T17:37

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Accept only valid Internet domain names

 * - Accept "%" within path and query part (to escape ASCII characters)

 *

 * @author 2004-02-27T19:21

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Allow unescaped ":" in URI components, since it apparently does not

 *   "conflict with the reserved purpose" (RFC 2396, section 2.2.; here:

 *   scheme component)

 * - Allow slashes, dots and dashes in URI components

 * - Removed invalid [...(...|...)...]

 *

 * @author 2004-03-01T21:48

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Allow IPv4 addresses

 *

 * @author 2004-03-08T02:20

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Allow "+" and "," in query part

 * - Optimized character classes

 *

 * @author (C) 2004-04-23T10:03

 *   Thomas Lahn <PointedEars@selfhtml.de> at localhost

 *

 * - Rewrite to use RFC 2822 and 2369 syntax

 */

function htmlEncode($text)

{

  // see RFC 2822 "Internet Message Format"

  $local_part    = '[^()<>@,;:\\"\-\[\] \x00-\x1A\x7F]+';

  // see RFC 2396 "Uniform Resource Identifiers (URI): Generic Syntax"

  // $digit      = '\d';          // 0-9; def. not required

  // $hex        = '\da-f';     // "hex" for case-insensitive match; def. N/R

  $alpha         = 'a-z';         // "alpha" for case-insensitive match

  $alphanum      = $alpha.'\d';   // "alphanum" for case-insensitive match

  $mark          = "\-_.!~*\'()";

  $reserved      = ';/?:@&=+$,';

  $unreserved    = $alphanum.$mark;

  $escaped       = '%[\da-f]';    // contains $hex

  // added (?!gt;) to allow "<URI>"

  $uric          = '(['.$reserved.$alphanum.$mark.'](?!gt;)|'.$escaped.')';

  $uric_no_slash = '(['.$unreserved.';\?:@&=+$,](?!gt;)|'.$escaped.')';

  $pchar         = '(['.$unreserved.':@&=+$,](?!gt;)|'.$escaped.')';

  $param         = $pchar;

  $segment       = $pchar.'*(;'.$param.')*';

  $abs_path      = '/' . $segment . '(/'.$segment.')*';

  $userinfo      = '(['.$unreserved.';:&=+$,](?!gt;)|'.$escaped.')*';

  $domainlabel   = '(['.$alphanum.']'

                   . '|['.$alphanum.'](['.$alphanum.']|-)*['.$alphanum.']'

                   . ')';

  $toplabel      = '(['.$alpha.']'

                   . '|['.$alpha.'](['.$alphanum.']|-)*['.$alphanum. '])';

  $hostname      = '('.$domainlabel. '\.)*' . $toplabel . '\.?';

  $ipv4_address  = '\d+\.\d+\.\d+\.\d+';

  $host          = '(' . $hostname . '|' . $ipv4_address . ')';

  $port          = '\d*';

  $hostport      = $host . '(:' . $port . ')?';

  $server_req    = '(' . $userinfo . ')?' . $hostport; // server is required

  $reg_name      = '([' . $unreserved . '$,;:@&=+](?!gt;)|' . $escaped . ')+';

  $authority     = '(' . $server_req . '|' . $reg_name . ')';

  $net_path      = '//' . $authority . '('.$abs_path.')?';

  $query         = $uric.'*';

  $scheme        = '(ht|f)tps?';

  $hier_part     = '(' . $net_path  .'|' . $abs_path . ')(\?' . $query . ')?';

  $opaque_part   = $uric_no_slash . $uric.'*';

  $absolute_uri  = $scheme . ':(' . $hier_part . '|' . $opaque_part . ')';

  $fragment      = $uric.'*';

  // absolute URIs only

  $uri_reference = $absolute_uri . '(#' . $fragment . ')?';

  // echo '<br>'.htmlentities($local_part . '@' . $host).'<br>';

  $searcharray = array(

    "'(?i)(" . $local_part . '@' . $host . ")'i",

    "'(?i)((?:(?!://).{3}|^.{0,2}))(www\." . $hostname

      . '|' . $ipv4_address . ")'i",

    "'(?i)(?<!href=\")(" . $uri_reference . ")(?!</a>)'i",

    "'(((?i)bug)\s+#?([\dA-Z_]+)\s+((?i)comment|Kommentar)\s+#?(\d+))'",

    "'(((?i)bug)\s+#?([\dA-Z_]+))'",

    "'(((?i)comment|Kommentar)\s+#?(\d+))'"

  );

  $replacearray = array(

    "<a href=\"mailto:\\1\">\\1</a>",

    "\\1http://\\2",

    "<a href=\"\\1\">\\1</a>",

    "<a href=\"./?bug=\\3#c\\5\">\\1</a>",

    "<a href=\"./?bug=\\3#details\">\\1</a>",

    "<a href=\"#c\\3\">\\1</a>"

  );

  return preg_replace($searcharray, $replacearray, $text);

}

/**

 * Converts HTML entities to real characters using the detected

 * or specified character encoding.

 *

 * @param string $s

 * @param int[optional] $quote_style

 * @return string

 */

function htmlEntityDecode($s, $quote_style=ENT_COMPAT, $encoding=null)

{

  $s = (string) $s;

  if (is_null($encoding))

  {

    $encoding = mb_detect_encoding($s);

    if ($encoding === 'ASCII')

    {

      $encoding = 'ISO-8859-1';

    }

  }

  return html_entity_decode($s, $quote_style, $encoding);

}

/**

 * Converts the argument into a visible (X)HTML hyperlink if a condition

 * applies.

 *

 * @author

 *   (C) 2003, 2004  Thomas Lahn <selfhtml.de@PointedEars.de>

 * @param $s

 *   Content to be converted.  Required.

 * @param $sCond

 *   Condition to be true for the content to be converted.

 *   The default is <code>true</code>.

 * @param $sURI

 *   Target URI of the hyperlink.  The default is the

 *   value of $s.

 * @param $sName

 *   Value of the <code>name</code> attribute of the

 *   <code>a</code> element.  Unused if not provided

 *   or empty.

 * @param $sTitle

 *   Value of the <code>title</code> attribute of the

 *   <code>a</code> element.  Unused if not provided

 *   or empty.

 * @param $sClass

 *   Value of the <code>class</code> attribute of the

 *   <code>a</code> element.  Unused if not provided

 *   or empty.

 * @return

 *   The converted argument if the condition applies,

 *   the unconverted argument otherwise.

 */

function makeLinkIf(

  $s,

  $sCond = true,

  $sURI = NULL,

  $sTarget = '',

  $sName = '',

  $sTitle = '',

  $sClass = '')

{

  return ($sCond || $sName

          ? '<a' . ($sCond

                    ? " href=\"" . (is_null($sURI) ? $s : $sURI)

                      . "\"".($sTarget ? " target=\"$sTarget\"" : '')

                    : ''

                   )

            . ($sName  ? " name=\"$sName\""   : '')

            . ($sTitle ? " title=\"$sTitle\"" : '')

            . ($sClass ? " class=\"$sClass\"" : '')

            . '>'

          : ''

         )

         . $s

         . ($sCond || $sName ? '</a>' : '');

}

/**

 * Returns a visible (X)HTML hyperlink that uses the mailto: URI scheme.

 *

 * @author (C) 2003  Thomas Lahn <selfhtml.de@PointedEars.de>

 *

 * @author (C) 2003-12-30  Thomas Lahn <selfhtml.de@PointedEars.de>

 * - Corrected `$email ($name)'.

 * - Now uses rawurlencode(...).

 * - Added PHPdoc.

 *

 * @author (C) 2004-11-30  Thomas Lahn <selfhtml.de@PointedEars.de>

 * - Don't rawurlencode(...) parens for comments.

 *

 * @param $sAddress

 *   E-mail address.  The default is <selfhtml.de@PointedEars.de>.

 * @param $sTitle

 *   Value of the <code>title</code> attribute of the

 *   <code>a</code> element.  Unused if not provided

 *   or empty.  The default is 'PointedEars'.

 * @param $sToName

 *   Name to be used in the To header of the e-mail.

 *   Note that @link{rawurlencode()} is used to escape

 *   special characters automatically.

 *   The default is "Thomas 'PointedEars' Lahn".

 *

 * @return

 *   The converted argument if the condition applies,

 *   the unconverted argument otherwise.

 */

function mailto_link(

  $sAddress = 'selfhtml.de@PointedEars.de',

  $sTitle = 'PointedEars',

  $sToName = "Thomas 'PointedEars' Lahn",

  $sSubject = 'SELFbug',

  $sImgPath = '../../media/mail.gif'

)

{

//width="14" height="15" // image size detection not yet implemented

  return ($sImgPath != ''

          ? '<img src="' . $sImgPath . '" border="0" alt="@">&nbsp;'

          : '')

    . '<a href="mailto:'

    . ($sAddress != ''

       ? $sAddress

       : 'selfhtml.de@PointedEars.de')

    . ($sToName != ''

       ? ' (' . rawurlencode($sToName) . ')'

       : '')

    . ($sSubject != ''

       ? '?subject=' . rawurlencode($sSubject)

       : '')

    . '">' . (($sTitle != '') ? $sTitle : $sAddress) . '</a>';

}

// map bug states to numbers so that they become comparable

function array_values_to_keys($a)

{

  $aNew = array();

  foreach ($a as $key => $value)

  {

    $aNew[$value] = count($aNew);

  }

  return $aNew;

}

/**

 * Converts a string or an array of strings to an associative

 * bitmask array with the string(s) as key(s).

 *

 * Converts the argument to a bitmask array where each member's

 * value is a power of 2, so that arbitrary member values can be

 * added to an integer on which bitwise operations with the member

 * value or a combination of member values are possible.

 *

 * @author (c) 2003 Thomas Lahn <SELFbug@PointedEars.de>

 * @param $aArray

 *   String or array of strings to be converted.

 */

function getBitmaskArray($aArray)

{

  $a = array();

  if (is_array($aArray))

  {

    for ($i = 0; $i < count($aArray); $i++)

    {

      $a[$aArray[$i]] = pow(2, $i);

    }

  }

  else

    $a[$aArray] = 1;

  return $a;

}

/**

 * Returns the contents of a file as if include() was used.

 *

 * @param string $filename Path of the file to retrieve

 * @return string File contents

 */

function get_include_content($filename)

{

  if (is_file($filename))

  {

    ob_start();

    include $filename;

    $contents = ob_get_contents();

    ob_end_clean();

    return $contents;

  }

  return '';

}

/**

 * Replaces each group of expressions in a string with the same

 * corresponding string.

 *

 * @param Array[Array[string] | string, string] $map

 * @param string                                $subject

 * @return string

 *   A copy of $subject with the provided mapping applied.

 */

function preg_replace_group($map = array(), $subject = '')

{

  if ($subject)

  {

    for ($i = 0, $len = count($map); $i < $len; $i++)

    {

      $subject = preg_replace($map[$i][0], $map[$i][1], $subject);

    }

  }

  return $subject;

}

/**

 * Randomly encodes a string of characters.

 *

 * @param string $s

 *   String to be encoded

 * @param string $format = 'sgml'

 *   Encoding format.  Currently only SGML-based encoding of

 *   ASCII characters with character references is supported.

 * @return string

 */

function randomEsc($s = '', $format = 'sgml')

{

  $f = function_exists('mt_rand') ? 'mt_rand' : 'rand';

  return preg_replace_callback('/[\\x00-\\x7F]/',

    create_function('$m', "return $f(0, 1)" . '? $m[0] : "&#" . ord($m[0]) . ";";'),

    $s);

}

/**

 * Reduces sequences of two or more consecutive white-space characters

 * in an input to a single space.

 *

 * @param string $s

 * @return string

 */

function reduceWhitespace($s)

{

  return preg_replace('/\s{2,}/', ' ', $s);

}

?>