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<?php
/**
* JsEngineBaseClass
*
* PHP 5
*
* CakePHP : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2011, Cake Software Foundation, Inc.
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package Cake.View.Helper
* @since CakePHP(tm) v 2.0
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
App::uses('AppHelper', 'View/Helper');
/**
* JsEngineBaseClass
*
* Abstract Base Class for All JsEngines to extend. Provides generic methods.
*
* @package Cake.View.Helper
*/
abstract class JsBaseEngineHelper extends AppHelper {
/**
* The js snippet for the current selection.
*
* @var string
*/
public $selection;
/**
* Collection of option maps. Option maps allow other helpers to use generic names for engine
* callbacks and options. Allowing uniform code access for all engine types. Their use is optional
* for end user use though.
*
* @var array
*/
protected $_optionMap = array();
/**
* An array of lowercase method names in the Engine that are buffered unless otherwise disabled.
* This allows specific 'end point' methods to be automatically buffered by the JsHelper.
*
* @var array
*/
public $bufferedMethods = array('event', 'sortable', 'drag', 'drop', 'slider');
/**
* Contains a list of callback names -> default arguments.
*
* @var array
*/
protected $_callbackArguments = array();
/**
* Constructor.
*
* @param View $View
* @param array $settings
*/
public function __construct($View, $settings = array()) {
parent::__construct($View, $settings);
}
/**
* Create an `alert()` message in Javascript
*
* @param string $message Message you want to alter.
* @return string completed alert()
*/
public function alert($message) {
return 'alert("' . $this->escape($message) . '");';
}
/**
* Redirects to a URL. Creates a window.location modification snippet
* that can be used to trigger 'redirects' from Javascript.
*
* @param mixed $url
* @param array $options
* @return string completed redirect in javascript
*/
public function redirect($url = null) {
return 'window.location = "' . Router::url($url) . '";';
}
/**
* Create a `confirm()` message
*
* @param string $message Message you want confirmed.
* @return string completed confirm()
*/
public function confirm($message) {
return 'confirm("' . $this->escape($message) . '");';
}
/**
* Generate a confirm snippet that returns false from the current
* function scope.
*
* @param string $message Message to use in the confirm dialog.
* @return string completed confirm with return script
*/
public function confirmReturn($message) {
$out = 'var _confirm = ' . $this->confirm($message);
$out .= "if (!_confirm) {\n\treturn false;\n}";
return $out;
}
/**
* Create a `prompt()` Javascript function
*
* @param string $message Message you want to prompt.
* @param string $default Default message
* @return string completed prompt()
*/
public function prompt($message, $default = '') {
return 'prompt("' . $this->escape($message) . '", "' . $this->escape($default) . '");';
}
/**
* Generates a JavaScript object in JavaScript Object Notation (JSON)
* from an array. Will use native JSON encode method if available, and $useNative == true
*
* ### Options:
*
* - `prefix` - String prepended to the returned data.
* - `postfix` - String appended to the returned data.
*
* @param array $data Data to be converted.
* @param array $options Set of options, see above.
* @return string A JSON code block
*/
public function object($data = array(), $options = array()) {
$defaultOptions = array(
'prefix' => '', 'postfix' => '',
);
$options = array_merge($defaultOptions, $options);
return $options['prefix'] . json_encode($data) . $options['postfix'];
}
/**
* Converts a PHP-native variable of any type to a JSON-equivalent representation
*
* @param mixed $val A PHP variable to be converted to JSON
* @param boolean $quoteString If false, leaves string values unquoted
* @return string a JavaScript-safe/JSON representation of $val
*/
public function value($val, $quoteString = true) {
switch (true) {
case (is_array($val) || is_object($val)):
$val = $this->object($val);
break;
case ($val === null):
$val = 'null';
break;
case (is_bool($val)):
$val = ($val === true) ? 'true' : 'false';
break;
case (is_int($val)):
$val = $val;
break;
case (is_float($val)):
$val = sprintf("%.11f", $val);
break;
default:
$val = $this->escape($val);
if ($quoteString) {
$val = '"' . $val . '"';
}
break;
}
return $val;
}
/**
* Escape a string to be JSON friendly.
*
* List of escaped elements:
*
* - "\r" => '\n'
* - "\n" => '\n'
* - '"' => '\"'
*
* @param string $string String that needs to get escaped.
* @return string Escaped string.
*/
public function escape($string) {
return $this->_utf8ToHex($string);
}
/**
* Encode a string into JSON. Converts and escapes necessary characters.
*
* @param string $string The string that needs to be utf8->hex encoded
* @return void
*/
protected function _utf8ToHex($string) {
$length = strlen($string);
$return = '';
for ($i = 0; $i < $length; ++$i) {
$ord = ord($string{$i});
switch (true) {
case $ord == 0x08:
$return .= '\b';
break;
case $ord == 0x09:
$return .= '\t';
break;
case $ord == 0x0A:
$return .= '\n';
break;
case $ord == 0x0C:
$return .= '\f';
break;
case $ord == 0x0D:
$return .= '\r';
break;
case $ord == 0x22:
case $ord == 0x2F:
case $ord == 0x5C:
$return .= '\\' . $string{$i};
break;
case (($ord >= 0x20) && ($ord <= 0x7F)):
$return .= $string{$i};
break;
case (($ord & 0xE0) == 0xC0):
if ($i + 1 >= $length) {
$i += 1;
$return .= '?';
break;
}
$charbits = $string{$i} . $string{$i + 1};
$char = Multibyte::utf8($charbits);
$return .= sprintf('\u%04s', dechex($char[0]));
$i += 1;
break;
case (($ord & 0xF0) == 0xE0):
if ($i + 2 >= $length) {
$i += 2;
$return .= '?';
break;
}
$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2};
$char = Multibyte::utf8($charbits);
$return .= sprintf('\u%04s', dechex($char[0]));
$i += 2;
break;
case (($ord & 0xF8) == 0xF0):
if ($i + 3 >= $length) {
$i += 3;
$return .= '?';
break;
}
$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2} . $string{$i + 3};
$char = Multibyte::utf8($charbits);
$return .= sprintf('\u%04s', dechex($char[0]));
$i += 3;
break;
case (($ord & 0xFC) == 0xF8):
if ($i + 4 >= $length) {
$i += 4;
$return .= '?';
break;
}
$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2} . $string{$i + 3} . $string{$i + 4};
$char = Multibyte::utf8($charbits);
$return .= sprintf('\u%04s', dechex($char[0]));
$i += 4;
break;
case (($ord & 0xFE) == 0xFC):
if ($i + 5 >= $length) {
$i += 5;
$return .= '?';
break;
}
$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2} . $string{$i + 3} . $string{$i + 4} . $string{$i + 5};
$char = Multibyte::utf8($charbits);
$return .= sprintf('\u%04s', dechex($char[0]));
$i += 5;
break;
}
}
return $return;
}
/**
* Create javascript selector for a CSS rule
*
* @param string $selector The selector that is targeted
* @return JsBaseEngineHelper instance of $this. Allows chained methods.
*/
abstract public function get($selector);
/**
* Add an event to the script cache. Operates on the currently selected elements.
*
* ### Options
*
* - `wrap` - Whether you want the callback wrapped in an anonymous function. (defaults to true)
* - `stop` - Whether you want the event to stopped. (defaults to true)
*
* @param string $type Type of event to bind to the current dom id
* @param string $callback The Javascript function you wish to trigger or the function literal
* @param array $options Options for the event.
* @return string completed event handler
*/
abstract public function event($type, $callback, $options = array());
/**
* Create a domReady event. This is a special event in many libraries
*
* @param string $functionBody The code to run on domReady
* @return string completed domReady method
*/
abstract public function domReady($functionBody);
/**
* Create an iteration over the current selection result.
*
* @param string $callback The function body you wish to apply during the iteration.
* @return string completed iteration
*/
abstract public function each($callback);
/**
* Trigger an Effect.
*
* ### Supported Effects
*
* The following effects are supported by all core JsEngines
*
* - `show` - reveal an element.
* - `hide` - hide an element.
* - `fadeIn` - Fade in an element.
* - `fadeOut` - Fade out an element.
* - `slideIn` - Slide an element in.
* - `slideOut` - Slide an element out.
*
* ### Options
*
* - `speed` - Speed at which the animation should occur. Accepted values are 'slow', 'fast'. Not all effects use
* the speed option.
*
* @param string $name The name of the effect to trigger.
* @param array $options Array of options for the effect.
* @return string completed string with effect.
*/
abstract public function effect($name, $options = array());
/**
* Make an XHR request
*
* ### Event Options
*
* - `complete` - Callback to fire on complete.
* - `success` - Callback to fire on success.
* - `before` - Callback to fire on request initialization.
* - `error` - Callback to fire on request failure.
*
* ### Options
*
* - `method` - The method to make the request with defaults to GET in more libraries
* - `async` - Whether or not you want an asynchronous request.
* - `data` - Additional data to send.
* - `update` - Dom id to update with the content of the request.
* - `type` - Data type for response. 'json' and 'html' are supported. Default is html for most libraries.
* - `evalScripts` - Whether or not <script> tags should be eval'ed.
* - `dataExpression` - Should the `data` key be treated as a callback. Useful for supplying `$options['data']` as
* another Javascript expression.
*
* @param mixed $url Array or String URL to target with the request.
* @param array $options Array of options. See above for cross library supported options
* @return string XHR request.
*/
abstract public function request($url, $options = array());
/**
* Create a draggable element. Works on the currently selected element.
* Additional options may be supported by the library implementation.
*
* ### Options
*
* - `handle` - selector to the handle element.
* - `snapGrid` - The pixel grid that movement snaps to, an array(x, y)
* - `container` - The element that acts as a bounding box for the draggable element.
*
* ### Event Options
*
* - `start` - Event fired when the drag starts
* - `drag` - Event fired on every step of the drag
* - `stop` - Event fired when dragging stops (mouse release)
*
* @param array $options Options array see above.
* @return string Completed drag script
*/
abstract public function drag($options = array());
/**
* Create a droppable element. Allows for draggable elements to be dropped on it.
* Additional options may be supported by the library implementation.
*
* ### Options
*
* - `accept` - Selector for elements this droppable will accept.
* - `hoverclass` - Class to add to droppable when a draggable is over.
*
* ### Event Options
*
* - `drop` - Event fired when an element is dropped into the drop zone.
* - `hover` - Event fired when a drag enters a drop zone.
* - `leave` - Event fired when a drag is removed from a drop zone without being dropped.
*
* @param array $options Array of options for the drop. See above.
* @return string Completed drop script
*/
abstract public function drop($options = array());
/**
* Create a sortable element.
* Additional options may be supported by the library implementation.
*
* ### Options
*
* - `containment` - Container for move action
* - `handle` - Selector to handle element. Only this element will start sort action.
* - `revert` - Whether or not to use an effect to move sortable into final position.
* - `opacity` - Opacity of the placeholder
* - `distance` - Distance a sortable must be dragged before sorting starts.
*
* ### Event Options
*
* - `start` - Event fired when sorting starts
* - `sort` - Event fired during sorting
* - `complete` - Event fired when sorting completes.
*
* @param array $options Array of options for the sortable. See above.
* @return string Completed sortable script.
*/
abstract public function sortable($options = array());
/**
* Create a slider UI widget. Comprised of a track and knob.
* Additional options may be supported by the library implementation.
*
* ### Options
*
* - `handle` - The id of the element used in sliding.
* - `direction` - The direction of the slider either 'vertical' or 'horizontal'
* - `min` - The min value for the slider.
* - `max` - The max value for the slider.
* - `step` - The number of steps or ticks the slider will have.
* - `value` - The initial offset of the slider.
*
* ### Events
*
* - `change` - Fired when the slider's value is updated
* - `complete` - Fired when the user stops sliding the handle
*
* @param array $options Array of options for the slider. See above.
* @return string Completed slider script
*/
abstract public function slider($options = array());
/**
* Serialize the form attached to $selector.
* Pass `true` for $isForm if the current selection is a form element.
* Converts the form or the form element attached to the current selection into a string/json object
* (depending on the library implementation) for use with XHR operations.
*
* ### Options
*
* - `isForm` - is the current selection a form, or an input? (defaults to false)
* - `inline` - is the rendered statement going to be used inside another JS statement? (defaults to false)
*
* @param array $options options for serialization generation.
* @return string completed form serialization script
*/
abstract public function serializeForm($options = array());
/**
* Parse an options assoc array into an Javascript object literal.
* Similar to object() but treats any non-integer value as a string,
* does not include `{ }`
*
* @param array $options Options to be converted
* @param array $safeKeys Keys that should not be escaped.
* @return string Parsed JSON options without enclosing { }.
*/
protected function _parseOptions($options, $safeKeys = array()) {
$out = array();
$safeKeys = array_flip($safeKeys);
foreach ($options as $key => $value) {
if (!is_int($value) && !isset($safeKeys[$key])) {
$value = $this->value($value);
}
$out[] = $key . ':' . $value;
}
sort($out);
return join(', ', $out);
}
/**
* Maps Abstract options to engine specific option names.
* If attributes are missing from the map, they are not changed.
*
* @param string $method Name of method whose options are being worked with.
* @param array $options Array of options to map.
* @return array Array of mapped options.
*/
protected function _mapOptions($method, $options) {
if (!isset($this->_optionMap[$method])) {
return $options;
}
foreach ($this->_optionMap[$method] as $abstract => $concrete) {
if (isset($options[$abstract])) {
$options[$concrete] = $options[$abstract];
unset($options[$abstract]);
}
}
return $options;
}
/**
* Prepare callbacks and wrap them with function ([args]) { } as defined in
* _callbackArgs array.
*
* @param string $method Name of the method you are preparing callbacks for.
* @param array $options Array of options being parsed
* @param string $callbacks Additional Keys that contain callbacks
* @return array Array of options with callbacks added.
*/
protected function _prepareCallbacks($method, $options, $callbacks = array()) {
$wrapCallbacks = true;
if (isset($options['wrapCallbacks'])) {
$wrapCallbacks = $options['wrapCallbacks'];
}
unset($options['wrapCallbacks']);
if (!$wrapCallbacks) {
return $options;
}
$callbackOptions = array();
if (isset($this->_callbackArguments[$method])) {
$callbackOptions = $this->_callbackArguments[$method];
}
$callbacks = array_unique(array_merge(array_keys($callbackOptions), (array)$callbacks));
foreach ($callbacks as $callback) {
if (empty($options[$callback])) {
continue;
}
$args = null;
if (!empty($callbackOptions[$callback])) {
$args = $callbackOptions[$callback];
}
$options[$callback] = 'function (' . $args . ') {' . $options[$callback] . '}';
}
return $options;
}
/**
* Conveinence wrapper method for all common option processing steps.
* Runs _mapOptions, _prepareCallbacks, and _parseOptions in order.
*
* @param string $method Name of method processing options for.
* @param array $options Array of options to process.
* @return string Parsed options string.
*/
protected function _processOptions($method, $options) {
$options = $this->_mapOptions($method, $options);
$options = $this->_prepareCallbacks($method, $options);
$options = $this->_parseOptions($options, array_keys($this->_callbackArguments[$method]));
return $options;
}
/**
* Convert an array of data into a query string
*
* @param array $parameters Array of parameters to convert to a query string
* @return string Querystring fragment
*/
protected function _toQuerystring($parameters) {
$out = '';
$keys = array_keys($parameters);
$count = count($parameters);
for ($i = 0; $i < $count; $i++) {
$out .= $keys[$i] . '=' . $parameters[$keys[$i]];
if ($i < $count - 1) {
$out .= '&';
}
}
return $out;
}
}
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