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<?php
/**
* Integrated Template - IT
*
* PHP version 4
*
* Copyright (c) 1997-2007 Ulf Wendel, Pierre-Alain Joye,
* David Soria Parra
*
* This source file is subject to the New BSD license, That is bundled
* with this package in the file LICENSE, and is available through
* the world-wide-web at
* http://www.opensource.org/licenses/bsd-license.php
* If you did not receive a copy of the new BSDlicense and are unable
* to obtain it through the world-wide-web, please send a note to
* pajoye@php.net so we can mail you a copy immediately.
*
* Author: Ulf Wendel <ulf.wendel@phpdoc.de>
* Pierre-Alain Joye <pajoye@php.net>
* David Soria Parra <dsp@php.net>
*
* @category HTML
* @package HTML_Template_IT
* @author Ulf Wendel <uw@netuse.de>
* @license BSD http://www.opensource.org/licenses/bsd-license.php
* @version CVS: $Id$
* @link http://pear.php.net/packages/HTML_Template_IT
* @access public
*/
require_once 'HTML/Template/IT.php';
require_once 'HTML/Template/IT_Error.php';
/**
* Integrated Template Extension - ITX
*
* With this class you get the full power of the phplib template class.
* You may have one file with blocks in it but you have as well one main file
* and multiple files one for each block. This is quite usefull when you have
* user configurable websites. Using blocks not in the main template allows
* you to modify some parts of your layout easily.
*
* Note that you can replace an existing block and add new blocks at runtime.
* Adding new blocks means changing a variable placeholder to a block.
*
* @category HTML
* @package HTML_Template_IT
* @author Ulf Wendel <uw@netuse.de>
* @license BSD http://www.opensource.org/licenses/bsd-license.php
* @link http://pear.php.net/packages/HTML_Template_IT
* @access public
*/
class HTML_Template_ITX extends HTML_Template_IT
{
/**
* Array with all warnings.
* @var array
* @access public
* @see $printWarning, $haltOnWarning, warning()
*/
var $warn = array();
/**
* Print warnings?
* @var array
* @access public
* @see $haltOnWarning, $warn, warning()
*/
var $printWarning = false;
/**
* Call die() on warning?
* @var boolean
* @access public
* @see $warn, $printWarning, warning()
*/
var $haltOnWarning = false;
/**
* RegExp used to test for a valid blockname.
* @var string
* @access private
*/
var $checkblocknameRegExp = '';
/**
* Functionnameprefix used when searching function calls in the template.
* @var string
* @access public
*/
var $functionPrefix = 'func_';
/**
* Functionname RegExp.
* @var string
* @access public
*/
var $functionnameRegExp = '[_a-zA-Z]+[A-Za-z_0-9]*';
/**
* RegExp used to grep function calls in the template.
*
* The variable gets set by the constructor.
*
* @access private
* @var string
* @see HTML_Template_IT()
*/
var $functionRegExp = '';
/**
* List of functions found in the template.
*
* @access private
* @var array
*/
var $functions = array();
/**
* List of callback functions specified by the user.
*
* @access private
* @var array
*/
var $callback = array();
/**
* Builds some complex regexps and calls the constructor
* of the parent class.
*
* Make sure that you call this constructor if you derive your own
* template class from this one.
*
* @param string $root Root node?
*
* @access public
* @see HTML_Template_IT()
*/
function __construct($root = '')
{
$this->checkblocknameRegExp = '@' . $this->blocknameRegExp . '@';
$this->functionRegExp = '@' . $this->functionPrefix . '(' .
$this->functionnameRegExp . ')\s*\(@sm';
parent::__construct($root);
} // end func constructor
/**
* Clears all datafields of the object and rebuild the internal blocklist
*
* LoadTemplatefile() and setTemplate() automatically call this function
* when a new template is given. Don't use this function
* unless you know what you're doing.
*
* @access private
* @return null
*/
function init()
{
$this->free();
$this->buildFunctionlist();
$this->findBlocks($this->template);
// we don't need it any more
$this->template = '';
$this->buildBlockvariablelist();
} // end func init
/**
* Replaces an existing block with new content.
*
* This function will replace a block of the template and all blocks
* contained in the replaced block and add a new block insted, means
* you can dynamically change your template.
*
* Note that changing the template structure violates one of the IT[X]
* development goals. I've tried to write a simple to use template engine
* supporting blocks. In contrast to other systems IT[X] analyses the way
* you've nested blocks and knows which block belongs into another block.
* The nesting information helps to make the API short and simple. Replacing
* blocks does not only mean that IT[X] has to update the nesting
* information (relatively time consumpting task) but you have to make sure
* that you do not get confused due to the template change itself.
*
* @param string $block Blockname
* @param string $template Blockcontent
* @param boolean $keep_content true if the new block inherits the content
* of the old block
*
* @return boolean
* @throws IT_Error
* @see replaceBlockfile(), addBlock(), addBlockfile()
* @access public
*/
function replaceBlock($block, $template, $keep_content = false)
{
if (!isset($this->blocklist[$block])) {
return new IT_Error("The block "."'$block'".
" does not exist in the template and thus it can't be replaced.",
__FILE__, __LINE__);
}
if ($template == '') {
return new IT_Error('No block content given.', __FILE__, __LINE__);
}
if ($keep_content) {
$blockdata = $this->blockdata[$block];
}
// remove all kinds of links to the block / data of the block
$this->removeBlockData($block);
$template = "<!-- BEGIN $block -->" . $template . "<!-- END $block -->";
$parents = $this->blockparents[$block];
$this->findBlocks($template);
$this->blockparents[$block] = $parents;
// KLUDGE: rebuild the list for all block - could be done faster
$this->buildBlockvariablelist();
if ($keep_content) {
$this->blockdata[$block] = $blockdata;
}
// old TODO - I'm not sure if we need this
// update caches
return true;
} // end func replaceBlock
/**
* Replaces an existing block with new content from a file.
*
* @param string $block Blockname
* @param string $filename Name of the file that contains the blockcontent
* @param boolean $keep_content true if the new block inherits the content of
* the old block
*
* @brother replaceBlock()
* @access public
* @return null
*/
function replaceBlockfile($block, $filename, $keep_content = false)
{
return $this->replaceBlock($block, $this->getFile($filename), $keep_content);
} // end func replaceBlockfile
/**
* Adds a block to the template changing a variable placeholder
* to a block placeholder.
*
* Add means "replace a variable placeholder by a new block".
* This is different to PHPLibs templates. The function loads a
* block, creates a handle for it and assigns it to a certain
* variable placeholder. To to the same with PHPLibs templates you would
* call set_file() to create the handle and parse() to assign the
* parsed block to a variable. By this PHPLibs templates assume
* that you tend to assign a block to more than one one placeholder.
* To assign a parsed block to more than only the placeholder you specify
* in this function you have to use a combination of getBlock()
* and setVariable().
*
* As no updates to cached data is necessary addBlock() and addBlockfile()
* are rather "cheap" meaning quick operations.
*
* The block content must not start with <!-- BEGIN blockname -->
* and end with <!-- END blockname --> this would cause overhead and
* produce an error.
*
* @param string $placeholder Name of the variable placeholder, the name
* must be unique within the template.
* @param string $blockname Name of the block to be added
* @param string $template Content of the block
*
* @return boolean
* @throws IT_Error
* @see addBlockfile()
* @access public
*/
function addBlock($placeholder, $blockname, $template)
{
// Don't trust any user even if it's a programmer or yourself...
if ($placeholder == '') {
return new IT_Error('No variable placeholder given.',
__FILE__, __LINE__);
} elseif ($blockname == '' ||
!preg_match($this->checkblocknameRegExp, $blockname)
) {
return new IT_Error("No or invalid blockname '$blockname' given.",
__FILE__, __LINE__);
} elseif ($template == '') {
return new IT_Error('No block content given.', __FILE__, __LINE__);
} elseif (isset($this->blocklist[$blockname])) {
return new IT_Error('The block already exists.',
__FILE__, __LINE__);
}
// find out where to insert the new block
$parents = $this->findPlaceholderBlocks($placeholder);
if (count($parents) == 0) {
return new IT_Error("The variable placeholder".
" '$placeholder' was not found in the template.",
__FILE__, __LINE__);
} elseif (count($parents) > 1) {
reset($parents);
while (list($k, $parent) = each($parents)) {
$msg .= "$parent, ";
}
$msg = substr($parent, -2);
return new IT_Error("The variable placeholder "."'$placeholder'".
" must be unique, found in multiple blocks '$msg'.",
__FILE__, __LINE__);
}
$template = "<!-- BEGIN $blockname -->"
. $template
. "<!-- END $blockname -->";
$this->findBlocks($template);
if ($this->flagBlocktrouble) {
return false; // findBlocks() already throws an exception
}
$this->blockinner[$parents[0]][] = $blockname;
$escblockname = '__' . $blockname . '__';
$this->blocklist[$parents[0]] = preg_replace(
'@' . $this->openingDelimiter . $placeholder .
$this->closingDelimiter . '@',
$this->openingDelimiter . $escblockname . $this->closingDelimiter,
$this->blocklist[$parents[0]]
);
$this->deleteFromBlockvariablelist($parents[0], $placeholder);
$this->updateBlockvariablelist($blockname);
return true;
} // end func addBlock
/**
* Adds a block taken from a file to the template changing a variable
* placeholder to a block placeholder.
*
* @param string $placeholder Name of the variable placeholder to be converted
* @param string $blockname Name of the block to be added
* @param string $filename File that contains the block
*
* @brother addBlock()
* @access public
* @return null
*/
function addBlockfile($placeholder, $blockname, $filename)
{
return $this->addBlock($placeholder, $blockname, $this->getFile($filename));
} // end func addBlockfile
/**
* Returns the name of the (first) block that contains
* the specified placeholder.
*
* @param string $placeholder Name of the placeholder you're searching
* @param string $block Name of the block to scan. If left out (default)
* all blocks are scanned.
*
* @return string Name of the (first) block that contains
* the specified placeholder.
* If the placeholder was not found or an error occured
* an empty string is returned.
* @throws IT_Error
* @access public
*/
function placeholderExists($placeholder, $block = '')
{
if ($placeholder == '') {
new IT_Error('No placeholder name given.', __FILE__, __LINE__);
return '';
}
if ($block != '' && !isset($this->blocklist[$block])) {
new IT_Error("Unknown block '$block'.", __FILE__, __LINE__);
return '';
}
// name of the block where the given placeholder was found
$found = '';
if ($block != '') {
if (is_array($variables = $this->blockvariables[$block])) {
// search the value in the list of blockvariables
reset($variables);
while (list($k, $variable) = each($variables)) {
if ($k == $placeholder) {
$found = $block;
break;
}
}
}
} else {
// search all blocks and return the name of the first block that
// contains the placeholder
reset($this->blockvariables);
while (list($blockname, $variables) = each($this->blockvariables)) {
if (is_array($variables) && isset($variables[$placeholder])) {
$found = $blockname;
break;
}
}
}
return $found;
} // end func placeholderExists
/**
* Checks the list of function calls in the template and
* calls their callback function.
*
* @access public
* @return null
*/
function performCallback()
{
reset($this->functions);
while (list($func_id, $function) = each($this->functions)) {
if (isset($this->callback[$function['name']])) {
if ($this->callback[$function['name']]['expandParameters']) {
$callFunction = 'call_user_func_array';
} else {
$callFunction = 'call_user_func';
}
if ($this->callback[$function['name']]['object'] != '') {
$call = $callFunction(
array(
&$GLOBALS[$this->callback[$function['name']]['object']],
$this->callback[$function['name']]['function']),
$function['args']);
} else {
$call = $callFunction(
$this->callback[$function['name']]['function'],
$function['args']);
}
$this->variableCache['__function' . $func_id . '__'] = $call;
}
}
} // end func performCallback
/**
* Returns a list of all function calls in the current template.
*
* @return array
* @access public
*/
function getFunctioncalls()
{
return $this->functions;
} // end func getFunctioncalls
/**
* Replaces a function call with the given replacement.
*
* @param int $functionID Function ID
* @param string $replacement Replacement
*
* @access public
* @deprecated
* @return null
*/
function setFunctioncontent($functionID, $replacement)
{
$this->variableCache['__function' . $functionID . '__'] = $replacement;
} // end func setFunctioncontent
/**
* Sets a callback function.
*
* IT[X] templates (note the X) can contain simple function calls.
* "function call" means that the editor of the template can add
* special placeholder to the template like 'func_h1("embedded in h1")'.
* IT[X] will grab this function calls and allow you to define a callback
* function for them.
*
* This is an absolutely evil feature. If your application makes heavy
* use of such callbacks and you're even implementing if-then etc. on
* the level of a template engine you're reiventing the wheel... - that's
* actually how PHP came into life. Anyway, sometimes it's handy.
*
* Consider also using XML/XSLT or native PHP. And please do not push
* IT[X] any further into this direction of adding logics to the template
* engine.
*
* For those of you ready for the X in IT[X]:
*
* <?php
* ...
* function h_one($args) {
* return sprintf('<h1>%s</h1>', $args[0]);
* }
*
* ...
* $itx = new HTML_Template_ITX(...);
* ...
* $itx->setCallbackFunction('h1', 'h_one');
* $itx->performCallback();
* ?>
*
* template:
* func_h1('H1 Headline');
*
* @param string $tplfunction Function name in the template
* @param string $callbackfunction Name of the callback function
* @param string $callbackobject Name of the callback object
* @param boolean $expandCallbackParameters If the callback is called with
* a list of parameters or with an
* array holding the parameters
*
* @return boolean False on failure.
* @throws IT_Error
* @access public
* @deprecated The $callbackobject parameter is depricated since
* version 1.2 and might be dropped in further versions.
*/
function setCallbackFunction($tplfunction, $callbackfunction,
$callbackobject = '',
$expandCallbackParameters = false) {
if ($tplfunction == '' || $callbackfunction == '') {
return new IT_Error("No template function "."('$tplfunction')".
" and/or no callback function ('$callback') given.",
__FILE__, __LINE__);
}
$this->callback[$tplfunction] = array(
'function' => $callbackfunction,
'object' => $callbackobject,
'expandParameters' => (boolean)
$expandCallbackParameters);
return true;
} // end func setCallbackFunction
/**
* Sets the Callback function lookup table
*
* @param array $functions function table
* array[templatefunction] =
* array(
* "function" => userfunction,
* "object" => userobject
* )
*
* @access public
* @return null
*/
function setCallbackFuntiontable($functions)
{
$this->callback = $functions;
} // end func setCallbackFunctiontable
/**
* Recursively removes all data assiciated with a block, including
* all inner blocks
*
* @param string $block block to be removed
*
* @return null
* @access private
*/
function removeBlockData($block)
{
if (isset($this->blockinner[$block])) {
foreach ($this->blockinner[$block] as $k => $inner) {
$this->removeBlockData($inner);
}
unset($this->blockinner[$block]);
}
unset($this->blocklist[$block]);
unset($this->blockdata[$block]);
unset($this->blockvariables[$block]);
unset($this->touchedBlocks[$block]);
} // end func removeBlockinner
/**
* Returns a list of blocknames in the template.
*
* @return array [blockname => blockname]
* @access public
* @see blockExists()
*/
function getBlocklist()
{
$blocklist = array();
foreach ($this->blocklist as $block => $content) {
$blocklist[$block] = $block;
}
return $blocklist;
} // end func getBlocklist
/**
* Checks wheter a block exists.
*
* @param string $blockname Blockname
*
* @return boolean
* @access public
* @see getBlocklist()
*/
function blockExists($blockname)
{
return isset($this->blocklist[$blockname]);
} // end func blockExists
/**
* Returns a list of variables of a block.
*
* @param string $block Blockname
*
* @return array [varname => varname]
* @access public
* @see BlockvariableExists()
*/
function getBlockvariables($block)
{
if (!isset($this->blockvariables[$block])) {
return array();
}
$variables = array();
foreach ($this->blockvariables[$block] as $variable => $v) {
$variables[$variable] = $variable;
}
return $variables;
} // end func getBlockvariables
/**
* Checks wheter a block variable exists.
*
* @param string $block Blockname
* @param string $variable Variablename
*
* @return boolean
* @access public
* @see getBlockvariables()
*/
function BlockvariableExists($block, $variable)
{
return isset($this->blockvariables[$block][$variable]);
} // end func BlockvariableExists
/**
* Builds a functionlist from the template.
*
* @access private
* @return null
*/
function buildFunctionlist()
{
$this->functions = array();
$template = $this->template;
$num = 0;
while (preg_match($this->functionRegExp, $template, $regs)) {
$pos = strpos($template, $regs[0]);
$template = substr($template, $pos + strlen($regs[0]));
$head = $this->getValue($template, ')');
$args = array();
$search = $regs[0] . $head . ')';
$replace = $this->openingDelimiter .
'__function' . $num . '__' .
$this->closingDelimiter;
$this->template = str_replace($search, $replace, $this->template);
$template = str_replace($search, $replace, $template);
while ($head != '' && $args2 = $this->getValue($head, ',')) {
$arg2 = trim($args2);
$args[] = ('"' == $arg2{0} || "'" == $arg2{0}) ?
substr($arg2, 1, -1) : $arg2;
if ($arg2 == $head) {
break;
}
$head = substr($head, strlen($arg2) + 1);
}
$this->functions[$num++] = array('name' => $regs[1],
'args' => $args);
}
} // end func buildFunctionlist
/**
* Truncates the given code from the first occurence of
* $delimiter but ignores $delimiter enclosed by " or '.
*
* @param string $code The code which should be parsed
* @param string $delimiter The delimiter char
*
* @access private
* @return string
* @see buildFunctionList()
*/
function getValue($code, $delimiter)
{
if ($code == '') {
return '';
}
if (!is_array($delimiter)) {
$delimiter = array($delimiter => true);
}
$len = strlen($code);
$enclosed = false;
$enclosed_by = '';
if (isset($delimiter[$code[0]])) {
$i = 1;
} else {
for ($i = 0; $i < $len; ++$i) {
$char = $code[$i];
if (($char == '"' || $char == "'")
&& ($char == $enclosed_by || '' == $enclosed_by)
&& (0 == $i || ($i > 0 && '\\' != $code[$i - 1]))
) {
if (!$enclosed) {
$enclosed_by = $char;
} else {
$enclosed_by = "";
}
$enclosed = !$enclosed;
}
if (!$enclosed && isset($delimiter[$char])) {
break;
}
}
}
return substr($code, 0, $i);
} // end func getValue
/**
* Deletes one or many variables from the block variable list.
*
* @param string $block Blockname
* @param mixed $variables Name of one variable or array of variables
* (array (name => true ) ) to be stripped.
*
* @access private
* @return null
*/
function deleteFromBlockvariablelist($block, $variables)
{
if (!is_array($variables)) {
$variables = array($variables => true);
}
reset($this->blockvariables[$block]);
while (list($varname, $val) = each($this->blockvariables[$block])) {
if (isset($variables[$varname])) {
unset($this->blockvariables[$block][$varname]);
}
}
} // end deleteFromBlockvariablelist
/**
* Updates the variable list of a block.
*
* @param string $block Blockname
*
* @access private
* @return null
*/
function updateBlockvariablelist($block)
{
preg_match_all(
$this->variablesRegExp,
$this->blocklist[$block], $regs
);
if (count($regs[1]) != 0) {
foreach ($regs[1] as $k => $var) {
$this->blockvariables[$block][$var] = true;
}
} else {
$this->blockvariables[$block] = array();
}
// check if any inner blocks were found
if (isset($this->blockinner[$block])
&& is_array($this->blockinner[$block])
&& count($this->blockinner[$block]) > 0
) {
/*
* loop through inner blocks, registering the variable
* placeholders in each
*/
foreach ($this->blockinner[$block] as $childBlock) {
$this->updateBlockvariablelist($childBlock);
}
}
} // end func updateBlockvariablelist
/**
* Returns an array of blocknames where the given variable
* placeholder is used.
*
* @param string $variable Variable placeholder
*
* @return array $parents parents[0..n] = blockname
* @access public
*/
function findPlaceholderBlocks($variable)
{
$parents = array();
reset($this->blocklist);
while (list($blockname, $content) = each($this->blocklist)) {
reset($this->blockvariables[$blockname]);
while (list($varname, $val) = each($this->blockvariables[$blockname])) {
if ($variable == $varname) {
$parents[] = $blockname;
}
}
}
return $parents;
} // end func findPlaceholderBlocks
/**
* Handles warnings, saves them to $warn and prints them or
* calls die() depending on the flags
*
* @param string $message Warning
* @param string $file File where the warning occured
* @param int $line Linenumber where the warning occured
*
* @see $warn, $printWarning, $haltOnWarning
* @access private
* @return null
*/
function warning($message, $file = '', $line = 0)
{
$message = sprintf(
'HTML_Template_ITX Warning: %s [File: %s, Line: %d]',
$message,
$file,
$line
);
$this->warn[] = $message;
if ($this->printWarning) {
print $message;
}
if ($this->haltOnWarning) {
die($message);
}
} // end func warning
} // end class HTML_Template_ITX
?>