<?php namespace CodeIgniter\View;
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014-2019 British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author CodeIgniter Dev Team
* @copyright 2014-2019 British Columbia Institute of Technology (https://bcit.ca/)
* @license https://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 3.0.0
* @filesource
*/
use CodeIgniter\Log\Logger;
use CodeIgniter\View\Exceptions\ViewException;
/**
* Class Parser
*
* ClassFormerlyKnownAsTemplateParser
*
* @package CodeIgniter\View
*/
class Parser extends View
{
/**
* Left delimiter character for pseudo vars
*
* @var string
*/
public $leftDelimiter = '{';
/**
* Right delimiter character for pseudo vars
*
* @var string
*/
public $rightDelimiter = '}';
/**
* Stores extracted noparse blocks.
*
* @var array
*/
protected $noparseBlocks = [];
/**
* Stores any plugins registered at run-time.
*
* @var array
*/
protected $plugins = [];
/**
* Stores the context for each data element
* when set by `setData` so the context is respected.
*
* @var array
*/
protected $dataContexts = [];
//--------------------------------------------------------------------
/**
* Constructor
*
* @param \Config\View $config
* @param string $viewPath
* @param mixed $loader
* @param boolean $debug
* @param Logger $logger
*/
public function __construct($config, string $viewPath = null, $loader = null, bool $debug = null, Logger $logger = null)
{
// Ensure user plugins override core plugins.
$this->plugins = $config->plugins ?? [];
parent::__construct($config, $viewPath, $loader, $debug, $logger);
}
//--------------------------------------------------------------------
/**
* Parse a template
*
* Parses pseudo-variables contained in the specified template view,
* replacing them with any data that has already been set.
*
* @param string $view
* @param array $options
* @param boolean $saveData
*
* @return string
*/
public function render(string $view, array $options = null, $saveData = null): string
{
$start = microtime(true);
if (is_null($saveData))
{
$saveData = $this->config->saveData;
}
$view = str_replace('.php', '', $view);
// Was it cached?
if (isset($options['cache']))
{
$cacheName = $options['cache_name'] ?: $view;
if ($output = cache($cacheName))
{
$this->logPerformance($start, microtime(true), $view);
return $output;
}
}
$view = $view . '.php';
$file = $this->viewPath . $view;
if (! is_file($file))
{
$file = $this->loader->locateFile($view, 'Views');
}
// locateFile will return an empty string if the file cannot be found.
if (empty($file))
{
throw ViewException::forInvalidFile($file);
}
$template = file_get_contents($file);
$output = $this->parse($template, $this->data, $options);
$this->logPerformance($start, microtime(true), $view);
if (! $saveData)
{
$this->data = [];
}
// Should we cache?
if (isset($options['cache']))
{
cache()->save($cacheName, $output, (int) $options['cache']);
}
return $output;
}
//--------------------------------------------------------------------
/**
* Parse a String
*
* Parses pseudo-variables contained in the specified string,
* replacing them with any data that has already been set.
*
* @param string $template
* @param array $options
* @param boolean $saveData
*
* @return string
*/
public function renderString(string $template, array $options = null, $saveData = null): string
{
$start = microtime(true);
if (is_null($saveData))
{
$saveData = $this->config->saveData;
}
$output = $this->parse($template, $this->data, $options);
$this->logPerformance($start, microtime(true), $this->excerpt($template));
if (! $saveData)
{
$this->data = [];
}
return $output;
}
//--------------------------------------------------------------------
/**
* Sets several pieces of view data at once.
* In the Parser, we need to store the context here
* so that the variable is correctly handled within the
* parsing itself, and contexts (including raw) are respected.
*
* @param array $data
* @param string $context The context to escape it for: html, css, js, url, raw
* If 'raw', no escaping will happen
*
* @return RendererInterface
*/
public function setData(array $data = [], string $context = null): RendererInterface
{
if (! empty($context))
{
foreach ($data as $key => &$value)
{
if (is_array($value))
{
foreach ($value as &$obj)
{
$obj = $this->objectToArray($obj);
}
}
else
{
$value = $this->objectToArray($value);
}
$this->dataContexts[$key] = $context;
}
}
$this->data = array_merge($this->data, $data);
return $this;
}
//--------------------------------------------------------------------
/**
* Parse a template
*
* Parses pseudo-variables contained in the specified template,
* replacing them with the data in the second param
*
* @param string $template
* @param array $data
* @param array $options Future options
* @return string
*/
protected function parse(string $template, array $data = [], array $options = null): string
{
if ($template === '')
{
return '';
}
// Remove any possible PHP tags since we don't support it
// and parseConditionals needs it clean anyway...
$template = str_replace(['<?', '?>'], ['<?', '?>'], $template);
$template = $this->parseComments($template);
$template = $this->extractNoparse($template);
// Replace any conditional code here so we don't have to parse as much
$template = $this->parseConditionals($template);
// Handle any plugins before normal data, so that
// it can potentially modify any template between its tags.
$template = $this->parsePlugins($template);
// loop over the data variables, replacing
// the content as we go.
foreach ($data as $key => $val)
{
$escape = true;
if (is_array($val))
{
$escape = false;
$replace = $this->parsePair($key, $val, $template);
}
else
{
$replace = $this->parseSingle($key, (string) $val);
}
foreach ($replace as $pattern => $content)
{
$template = $this->replaceSingle($pattern, $content, $template, $escape);
}
}
$template = $this->insertNoparse($template);
return $template;
}
//--------------------------------------------------------------------
/**
* Parse a single key/value, extracting it
*
* @param string $key
* @param string $val
* @return array
*/
protected function parseSingle(string $key, string $val): array
{
$pattern = '#' . $this->leftDelimiter . '!?\s*' . preg_quote($key) . '\s*\|*\s*([|a-zA-Z0-9<>=\(\),:_\-\s\+]+)*\s*!?' . $this->rightDelimiter . '#ms';
return [$pattern => $val];
}
//--------------------------------------------------------------------
/**
* Parse a tag pair
*
* Parses tag pairs: {some_tag} string... {/some_tag}
*
* @param string $variable
* @param array $data
* @param string $template
* @return array
*/
protected function parsePair(string $variable, array $data, string $template): array
{
// Holds the replacement patterns and contents
// that will be used within a preg_replace in parse()
$replace = [];
// Find all matches of space-flexible versions of {tag}{/tag} so we
// have something to loop over.
preg_match_all(
'#' . $this->leftDelimiter . '\s*' . preg_quote($variable) . '\s*' . $this->rightDelimiter . '(.+?)' .
$this->leftDelimiter . '\s*' . '/' . preg_quote($variable) . '\s*' . $this->rightDelimiter . '#s', $template, $matches, PREG_SET_ORDER
);
/*
* Each match looks like:
*
* $match[0] {tag}...{/tag}
* $match[1] Contents inside the tag
*/
foreach ($matches as $match)
{
// Loop over each piece of $data, replacing
// it's contents so that we know what to replace in parse()
$str = ''; // holds the new contents for this tag pair.
foreach ($data as $row)
{
// Objects that have a `toArray()` method should be
// converted with that method (i.e. Entities)
if (is_object($row) && method_exists($row, 'toArray'))
{
$row = $row->toArray();
}
// Otherwise, cast as an array and it will grab public properties.
else if (is_object($row))
{
$row = (array)$row;
}
$temp = [];
$pairs = [];
$out = $match[1];
foreach ($row as $key => $val)
{
// For nested data, send us back through this method...
if (is_array($val))
{
$pair = $this->parsePair($key, $val, $match[1]);
if (! empty($pair))
{
$pairs[array_keys( $pair )[0]] = true;
$temp = array_merge($temp, $pair);
}
continue;
}
else if (is_object($val))
{
$val = 'Class: ' . get_class($val);
}
else if (is_resource($val))
{
$val = 'Resource';
}
$temp['#' . $this->leftDelimiter . '!?\s*' . preg_quote($key) . '\s*\|*\s*([|\w<>=\(\),:_\-\s\+]+)*\s*!?' . $this->rightDelimiter . '#s'] = $val;
}
// Now replace our placeholders with the new content.
foreach ($temp as $pattern => $content)
{
$out = $this->replaceSingle($pattern, $content, $out, ! isset( $pairs[$pattern] ) );
}
$str .= $out;
}
$replace['#' . $match[0] . '#s'] = $str;
}
return $replace;
}
//--------------------------------------------------------------------
/**
* Removes any comments from the file. Comments are wrapped in {# #} symbols:
*
* {# This is a comment #}
*
* @param string $template
*
* @return string
*/
protected function parseComments(string $template): string
{
return preg_replace('/\{#.*?#\}/s', '', $template);
}
//--------------------------------------------------------------------
/**
* Extracts noparse blocks, inserting a hash in its place so that
* those blocks of the page are not touched by parsing.
*
* @param string $template
*
* @return string
*/
protected function extractNoparse(string $template): string
{
$pattern = '/\{\s*noparse\s*\}(.*?)\{\s*\/noparse\s*\}/ms';
/*
* $matches[][0] is the raw match
* $matches[][1] is the contents
*/
if (preg_match_all($pattern, $template, $matches, PREG_SET_ORDER))
{
foreach ($matches as $match)
{
// Create a hash of the contents to insert in its place.
$hash = md5($match[1]);
$this->noparseBlocks[$hash] = $match[1];
$template = str_replace($match[0], "noparse_{$hash}", $template);
}
}
return $template;
}
//--------------------------------------------------------------------
/**
* Re-inserts the noparsed contents back into the template.
*
* @param string $template
*
* @return string
*/
public function insertNoparse(string $template): string
{
foreach ($this->noparseBlocks as $hash => $replace)
{
$template = str_replace("noparse_{$hash}", $replace, $template);
unset($this->noparseBlocks[$hash]);
}
return $template;
}
//--------------------------------------------------------------------
/**
* Parses any conditionals in the code, removing blocks that don't
* pass so we don't try to parse it later.
*
* Valid conditionals:
* - if
* - elseif
* - else
*
* @param string $template
*
* @return string
*/
protected function parseConditionals(string $template): string
{
$pattern = '/\{\s*(if|elseif)\s*((?:\()?(.*?)(?:\))?)\s*\}/ms';
/**
* For each match:
* [0] = raw match `{if var}`
* [1] = conditional `if`
* [2] = condition `do === true`
* [3] = same as [2]
*/
preg_match_all($pattern, $template, $matches, PREG_SET_ORDER);
foreach ($matches as $match)
{
// Build the string to replace the `if` statement with.
$condition = $match[2];
$statement = $match[1] === 'elseif' ? '<?php elseif (' . $condition . '): ?>' : '<?php if (' . $condition . '): ?>';
$template = str_replace($match[0], $statement, $template);
}
$template = preg_replace('/\{\s*else\s*\}/ms', '<?php else: ?>', $template);
$template = preg_replace('/\{\s*endif\s*\}/ms', '<?php endif; ?>', $template);
// Parse the PHP itself, or insert an error so they can debug
ob_start();
extract($this->data);
try
{
$result = eval('?>' . $template . '<?php ');
}
catch (\ParseError $e)
{
ob_end_clean();
throw ViewException::forTagSyntaxError(str_replace(['?>', '<?php '], '', $template));
}
return ob_get_clean();
}
//--------------------------------------------------------------------
/**
* Over-ride the substitution field delimiters.
*
* @param string $leftDelimiter
* @param string $rightDelimiter
* @return RendererInterface
*/
public function setDelimiters($leftDelimiter = '{', $rightDelimiter = '}'): RendererInterface
{
$this->leftDelimiter = $leftDelimiter;
$this->rightDelimiter = $rightDelimiter;
return $this;
}
//--------------------------------------------------------------------
/**
* Handles replacing a pseudo-variable with the actual content. Will double-check
* for escaping brackets.
*
* @param $pattern
* @param $content
* @param $template
* @param boolean $escape
*
* @return string
*/
protected function replaceSingle($pattern, $content, $template, bool $escape = false): string
{
// Any dollar signs in the pattern will be mis-interpreted, so slash them
$pattern = addcslashes($pattern, '$');
// Replace the content in the template
$template = preg_replace_callback($pattern, function ($matches) use ($content, $escape) {
// Check for {! !} syntax to not-escape this one.
if (strpos($matches[0], '{!') === 0 && substr($matches[0], -2) === '!}')
{
$escape = false;
}
return $this->prepareReplacement($matches, $content, $escape);
}, $template);
return $template;
}
//--------------------------------------------------------------------
/**
* Callback used during parse() to apply any filters to the value.
*
* @param array $matches
* @param string $replace
* @param boolean $escape
*
* @return string
*/
protected function prepareReplacement(array $matches, string $replace, bool $escape = true)
{
$orig = array_shift($matches);
// Our regex earlier will leave all chained values on a single line
// so we need to break them apart so we can apply them all.
$filters = isset($matches[0]) ? explode('|', $matches[0]) : [];
if ($escape && ! isset($matches[0]))
{
if ($context = $this->shouldAddEscaping($orig))
{
$filters[] = "esc({$context})";
}
}
$replace = $this->applyFilters($replace, $filters);
return $replace;
}
//--------------------------------------------------------------------
/**
* Checks the placeholder the view provided to see if we need to provide any autoescaping.
*
* @param string $key
*
* @return false|html
*/
public function shouldAddEscaping(string $key)
{
$escape = false;
$key = trim(str_replace(['{', '}'], '', $key));
// If the key has a context stored (from setData)
// we need to respect that.
if (array_key_exists($key, $this->dataContexts))
{
if ($this->dataContexts[$key] !== 'raw')
{
return $this->dataContexts[$key];
}
}
// No pipes, then we know we need to escape
elseif (strpos($key, '|') === false)
{
$escape = 'html';
}
// If there's a `noescape` then we're definitely false.
elseif (strpos($key, 'noescape') !== false)
{
$escape = false;
}
// If no `esc` filter is found, then we'll need to add one.
elseif (! preg_match('/\s+esc/', $key))
{
$escape = 'html';
}
return $escape;
}
//--------------------------------------------------------------------
/**
* Given a set of filters, will apply each of the filters in turn
* to $replace, and return the modified string.
*
* @param string $replace
* @param array $filters
*
* @return string
*/
protected function applyFilters(string $replace, array $filters): string
{
// Determine the requested filters
foreach ($filters as $filter)
{
// Grab any parameter we might need to send
preg_match('/\([a-zA-Z0-9\-:_ +,<>=]+\)/', $filter, $param);
// Remove the () and spaces to we have just the parameter left
$param = ! empty($param) ? trim($param[0], '() ') : null;
// Params can be separated by commas to allow multiple parameters for the filter
if (! empty($param))
{
$param = explode(',', $param);
// Clean it up
foreach ($param as &$p)
{
$p = trim($p, ' "');
}
}
else
{
$param = [];
}
// Get our filter name
$filter = ! empty($param) ? trim(strtolower(substr($filter, 0, strpos($filter, '(')))) : trim($filter);
if (! array_key_exists($filter, $this->config->filters))
{
continue;
}
// Filter it....
$replace = $this->config->filters[$filter]($replace, ...$param);
}
return $replace;
}
//--------------------------------------------------------------------
// Plugins
//--------------------------------------------------------------------
/**
* Scans the template for any parser plugins, and attempts to execute them.
* Plugins are notated based on {+ +} opening and closing braces.
*
* When encountered,
*
* @param string $template
*
* @return string
*/
protected function parsePlugins(string $template)
{
foreach ($this->plugins as $plugin => $callable)
{
// Paired tags are enclosed in an array in the config array.
$isPair = is_array($callable);
$callable = $isPair ? array_shift($callable) : $callable;
$pattern = $isPair ? '#{\+\s*' . $plugin . '([\w\d=-_:\+\s()/\"@.]*)?\s*\+}(.+?){\+\s*/' . $plugin . '\s*\+}#ims' : '#{\+\s*' . $plugin . '([\w\d=-_:\+\s()/\"@.]*)?\s*\+}#ims';
/**
* Match tag pairs
*
* Each match is an array:
* $matches[0] = entire matched string
* $matches[1] = all parameters string in opening tag
* $matches[2] = content between the tags to send to the plugin.
*/
preg_match_all($pattern, $template, $matches, PREG_SET_ORDER);
if (empty($matches))
{
continue;
}
foreach ($matches as $match)
{
$params = [];
// Split on "words", but keep quoted groups together, accounting for escaped quotes.
// Note: requires double quotes, not single quotes.
$parts = str_getcsv($match[1], ' ');
foreach ($parts as $part)
{
if (empty($part))
{
continue;
}
if (strpos($part, '=') !== false)
{
list($a, $b) = explode('=', $part);
$params[$a] = $b;
}
else
{
$params[] = $part;
}
}
unset($parts);
$template = $isPair ? str_replace($match[0], $callable($match[2], $params), $template) : str_replace($match[0], $callable($params), $template);
}
}
return $template;
}
/**
* Makes a new plugin available during the parsing of the template.
*
* @param string $alias
* @param callable $callback
*
* @param boolean $isPair
*
* @return $this
*/
public function addPlugin(string $alias, callable $callback, bool $isPair = false)
{
$this->plugins[$alias] = $isPair ? [$callback] : $callback;
return $this;
}
//--------------------------------------------------------------------
/**
* Removes a plugin from the available plugins.
*
* @param string $alias
*
* @return $this
*/
public function removePlugin(string $alias)
{
unset($this->plugins[$alias]);
return $this;
}
/**
* Converts an object to an array, respecting any
* toArray() methods on an object.
*
* @param $value
*
* @return mixed
*/
protected function objectToArray($value)
{
// Objects that have a `toArray()` method should be
// converted with that method (i.e. Entities)
if (is_object($value) && method_exists($value, 'toArray'))
{
$value = $value->toArray();
}
// Otherwise, cast as an array and it will grab public properties.
else if (is_object($value))
{
$value = (array)$value;
}
return $value;
}
//--------------------------------------------------------------------
}
Jim Parry