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ITX.php
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2001-01-24
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<?php
//
// +----------------------------------------------------------------------+
// | PHP version 4.0 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2001 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Ulf Wendel <ulf.wendel@phpdoc.de> |
// +----------------------------------------------------------------------+
//
// $Id: ITX.php,v 1.4 2001/01/24 11:19:28 sbergmann Exp $
//
require_once "HTML/IT.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 some parts of your layout easily.
*
* Note that you can replace an existing block and add new blocks add runtime.
* Adding new blocks means changing a variable placeholder to a block.
*
* @author Ulf Wendel <uw@netuse.de>
* @access public
* @version $Id: ITX.php,v 1.4 2001/01/24 11:19:28 sbergmann Exp $
*/
class IntegratedTemplateExtension extends IntegratedTemplate {
/**
* 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
*/
var $checkblocknameRegExp = "";
/**
* Functionnameprefix used when searching function calls in the template.
* @var string
*/
var $functionPrefix = "func_";
/**
* Functionname RegExp.
* @var string
*/
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.
*
* @var string
* @see IntegratedTemplateExtension()
*/
var $functionRegExp = "";
/**
* List of functions found in the template.
*
* @var array
*/
var $functions = array();
/**
* List of callback functions specified by the user.
*
* @var array
*/
var $callback = array();
/**
* Builds some complex regexps and calls the constructor of the parent class.
*
* Make sure that you call this constructor if you derive you own
* template class from this one.
*
* @see IntegratedTemplate()
*/
function IntegratedTemplateExtension($root = "") {
$this->checkblocknameRegExp = "@" . $this->blocknameRegExp . "@";
$this->functionRegExp = "@" . $this->functionPrefix . "(" . $this->functionnameRegExp . ")\s*\(@sm";
$this->IntegratedTemplate($root);
} // end func constructor
function init() {
$this->free();
$this->buildFunctionlist();
$this->findBlocks($this->template);
$this->buildBlockvariablelist();
} // end func init
/**
* Replaces an existing block with new content. Warning: not implemented yet.
*
* The Replacement does not affect previously added variables. All data is cached.
* In case the new block does contain less or other variable placeholder the previously
* passed data that is no longer referenced will be deleted. The internal list
* of allowed variables gets updated as well.
*
* In case the original block contains other blocks it must eighter have placeholder
* for the inner blocks or contain them. If you want to use placeholder the placeholder must
* look like openingDelimiter."__".blockname."__".closingDelimiter .
*
* Due to the cache updates replaceBlock() and replaceBlockfile() are "expensive" operations
* which means extensive usage will slow down your script. So try to avoid them and if
* you can't do so try to use them before you pass lots of variables to the block you're
* replacing.
*
* @param string Blockname
* @param string Blockcontent
* @return boolean
* @see replaceBlockfile(), addBlock(), addBlockfile()
* @access public
*/
function replaceBlock($block, $template) {
if (!isset($this->blocklist[$block])) {
$this->halt("The block '$block' does not exist in the template and thus it can't be replaced.", __FILE__, __LINE__);
return false;
}
if (""==$template) {
$this->halt("No block content given.", __FILE__, __LINE__);
return false;
}
print "This function has not been coded yet.";
// find inner blocks
// add to variablelist
// compare variable list
// update caches
return true;
} // end func replaceBlock
/**
* Replaces an existing block with new content from a file. Warning: not implemented yet.
* @brother replaceBlock()
* @param string Blockname
* @param string Name of the file that contains the blockcontent
*/
function replaceBlockfile($block, $filename) {
return $this->replaceBlock($block, $this->getFile($filename));
} // 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 Name of the variable placeholder, the name must be unique within the template.
* @param string Name of the block to be added
* @param string Content of the block
* @return boolean
* @see addBlockfile()
* @access public
*/
function addBlock($placeholder, $blockname, $template) {
// Don't trust any user even if it's a programmer or yourself...
if ("" == $placeholder) {
$this->halt("No variable placeholder given.", __FILE__, __LINE__);
return false;
} else if ("" == $blockname || !preg_match($this->checkblocknameRegExp, $blockname) ) {
print $this->checkblocknameRegExp;
$this->halt("No or invalid blockname '$blockname' given.", __FILE__, __LINE__);
return false;
} else if ("" == $template) {
$this->halt("No block content given.", __FILE__, __LINE__);
return false;
} else if (isset($this->blocklist[$blockname])) {
$this->halt("The block already exists.", __FILE__, __LINE__);
return false;
}
// Hmm, we should do some more tests.
$parents = $this->findPlaceholderBlocks($placeholder);
if (0 == count($parents)) {
$this->halt("The variable placeholder '$placeholder' was not found in the template.", __FILE__, __LINE__);
return false;
} else if ( count($parents) > 1 ) {
reset($parents);
while (list($k, $parent) = each($parents))
$msg .= "$parent, ";
$msg = substr($parent, -2);
$this->halt("The variable placeholder '$placeholder' must be unique, found in multiple blocks '$msg'.", __FILE__, __LINE__);
return false;
}
$template = "<!-- BEGIN $blockname -->" . $template . "<!-- END $blockname -->";
$this->findBlocks($template);
if ($this->flagBlocktrouble)
return false; // findBlocks() already throws an exception
$this->blockinner[$parents[0]][] = $blockname;
$this->blocklist[$parents[0]] = preg_replace( "@" . $this->openingDelimiter . $placeholder . $this->closingDelimiter . "@",
$this->openingDelimiter . "__" . $blockname . "__" . $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 Name of the variable placeholder to be converted
* @param string Name of the block to be added
* @param string File that contains the block
* @brother addBlock()
*/
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 Name of the placeholder you're searching
* @param string 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.
* @access public
*/
function placeholderExists($placeholder, $block = "") {
if ("" == $placeholder) {
$this->halt("No placeholder name given.", __FILE__, __LINE__);
return "";
}
if ("" != $block && !isset($this->blocklist[$block])) {
$this->halt("Unknown block '$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 ($variable == $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)) {
reset($variables);
while (list($k, $variable) = each($variables))
if ($variable == $placeholder) {
$found = $blockname;
break 2;
}
}
}
return $found;
} // end func placeholderExists
/**
* Checks the list of function calls in the template and calls their callback function.
*
* @access public
*/
function performCallback() {
reset($this->functions);
while (list($func_id, $function) = each($this->functions)) {
if (isset($this->callback[$function["name"]])) {
if ("" != $this->callback[$function["name"]]["object"])
$this->setFunctioncontent($func_id,
call_user_method(
$this->callback[$function["name"]]["function"],
$GLOBALS[$this->callback[$function["name"]]["object"]],
$function["args"]
)
);
else
$this->setFunctioncontent( $func_id,
call_user_func(
$this->callback[$function["name"]]["function"],
$function["args"]
)
);
}
}
} // end func performCallback
/**
* Returns a list of all function calls in the current template.
*
* @return array
* @access public
*/
function getFunctioncalls() {
return $this->functions;
} // end func getFunctioncalls
/**
* Replaces a function call with the given replacement.
*
* @param int Function ID
* @param string Replacement
* @access public
*/
function setFunctioncontent($functionID, $replacement) {
$this->variableCache["__function" . $functionID . "__"] = $replacement;
} // end func setFunctioncontent
/**
* Sets a callback function.
*
* @param string Function name in the template
* @param string Name of the callback function
* @param string Name of the callback object
* @return boolean False on failure.
* @access public
*/
function setCallbackFunction($tplfunction, $callbackfunction, $callbackobject = "") {
if ("" == $tplfunction || "" == $callbackfunction) {
$this->halt("No template function ('$tplfunction') and/or no callback function ('$callback') given.", __FILE__, __LINE__);
return false;
}
$this->callback[$tplfunction] = array(
"function" => $callbackfunction,
"object" => $callbackobject
);
return true;
} // end func setCallbackFunction
/**
* Sets the Callback function lookup table
*
* @param array function table - array[templatefunction] = array( "function" => userfunction, "object" => userobject )
* @access public
*/
function setCallbackFuntiontable($functions) {
$this->callback = $functions;
} // end func setCallbackFunctiontable
/**
* 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 $blocklist;
} // end func getBlocklist
/**
* Checks wheter a block exists.
*
* @param string
* @return boolean
* @access public
* @see getBlocklist()
*/
function blockExists($blockname) {
return isset($this->blocklist[$blockname]);
} // end func blockExists
/**
* Returns a list of variables of a block.
*
* @param string Blockname
* @return array [varname => varname]
* @access public
* @see BlockvariableExists()
*/
function getBlockvariables($block) {
if (!isset($this->blockvariables[$block]))
return array();
$variables = array();
foreach ($this->blockvariables as $variable => $v)
$variables[$variable] = $variable;
return $variables;
} // end func getBlockvariables
/**
* Checks wheter a block variable exists.
*
* @param string Blockname
* @param string Variablename
* @return boolean
* @access public
* @see getBlockvariables()
*/
function BlockvariableExists($block, $variable) {
return isset($this->blockvariables[$block][$variable]);
} // end func BlockvariableExists
/**
* Builds a functionlist from the template.
*/
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();
$this->template = str_replace($regs[0] . $head . ")", "{__function" . $num . "__}", $this->template);
$template = str_replace($regs[0] . $head . ")", "{__function" . $num . "__}", $template);
while ("" != $head && $arg = $this->getValue($head, ",")) {
$args[] = trim($arg);
if ($arg == $head)
break;
$head = substr($head, strlen($arg) + 1);
}
$this->functions[$num++] = array(
"name" => $regs[1],
"args" => $args
);
}
} // end func buildFunctionlist
function getValue($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, $i);
} // end func getValue
/**
* Deletes one or many variables from the block variable list.
*
* @param string Blockname
* @param mixed Name of one variable or array of variables ( array ( name => true ) ) to be stripped.
*/
function deleteFromBlockvariablelist($block, $variables) {
if (!is_array($variables))
$variables = array($variables => true);
reset($this->blockvariables[$block]);
while (list($k, $varname) = each($this->blockvariables[$block]))
if (isset($variables[$varname]))
unset($this->blockvariables[$block][$k]);
} // end deleteFromBlockvariablelist
/**
* Updates the variable list of a block.
*
* @param string Blockname
*/
function updateBlockvariablelist($block) {
preg_match_all( $this->variablesRegExp, $this->blocklist[$block], $regs );
$this->blockvariables[$block] = $regs[1];
} // end func updateBlockvariablelist
/**
* Returns an array of blocknames where the given variable placeholder is used.
*
* @param string Variable placeholder
* @return array $parents parents[0..n] = blockname
*/
function findPlaceholderBlocks($variable) {
$parents = array();
reset($this->blocklist);
while (list($blockname, $content) = each($this->blocklist)) {
reset($this->blockvariables[$blockname]);
while (list($k, $varname) = each($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 Warning
* @param string File where the warning occured
* @param int Linenumber where the warning occured
* @see $warn, $printWarning, $haltOnWarning
*/
function warning($message, $file="", $line=0) {
$message = sprintf("IntegratedTemplateExtension Warning: %s [File: %s, Line: %d]",
$message,
$file,
$line );
$this->warn[] = $message;
if ($this->printWarning)
print $message;
if ($this->haltOnError)
die($message);
} // end func warning
} // end class IntegratedTemplateExtension
?>