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<?php
namespace Luigi;
const VERSION = '0.4.0';
final class Error extends \Exception {};
final class Filters {
private static $filters = null;
public static function init() {
if (self::$filters !== null)
return;
self::$filters = array(
'h' => function($s) {
return htmlspecialchars($v);
},
'u' => function($s) {
return urlencode($v);
},
'json' => function($v) {
return json_encode($v);
},
'hash' => function($v, $args) {
$algo = (count($args) == 1) ? $args[0] : 'md5';
return hash($algo, $v);
},
'base64' => function($v) {
return base64_encode($v);
},
'nl2br' => function($v) {
return nl2br($v);
},
'uc' => function($v) {
return strtoupper($v);
},
'lc' => function($v) {
return strtolower($v);
},
'trim' => function($v) {
return trim($v);
},
'rtrim' => function($v) {
return rtrim($v);
},
'ltrim' => function($v) {
return ltrim($v);
},
's' => function($v) {
return ($v == 1) ? '' : 's';
},
'strlen' => function($v) {
return strlen($v);
},
'count' => function($v) {
return count($v);
},
);
}
public static function get($key) {
self::init();
if (!isset(self::$filters[$key]))
throw new Error("unknown filter: $key");
return self::$filters[$key];
}
public static function add(array $filters) {
self::init();
self::$filters = array_merge(self::$filters, $filters);
}
};
final class Parser {
private static $RES = array(
'action' => '/
# match opening brace
%\{
# match optional whitespace
\s*
# match key
(?<key>[^\s\|\}]+)
# match filter(s)
(?<filters>(\s*\|(\s*[^\s\|\}]+)+)*)
# match optional whitespace
\s*
# match closing brace
\}
# or match up all non-% chars or a single % char
| (?<text>[^%]* | %)
/mx',
'filter' => '/
# match filter name
(?<name>\S+)
# match filter arguments (optional)
(?<args>(\s*\S+)*)
# optional trailing whitespace
\s*
/mx',
'delim_filters' => '/\s*\|\s*/m',
'delim_args' => '/\s+/m',
);
public static function parse_template($template) {
# build list of matches
$matches = array();
$num_matches = preg_match_all(
self::$RES['action'],
$template,
$matches,
PREG_SET_ORDER
);
# check for error
if ($num_matches === false)
throw new Error("invalid template: $template");
# walk over matches and build list of actions
$r = array_map(function($m) {
if ($m['key'] !== '') {
# key and filters
return array(
'type' => 'action',
'key' => $m['key'],
'filters' => self::parse_filters($m['filters']),
);
} else {
# literal text
return array(
'type' => 'text',
'text' => $m['text'],
);
}
}, $matches);
# return result
return $r;
}
public static function parse_filters($filters) {
# split into individual filters
$r = array();
foreach (preg_split(self::$RES['delim_filters'], $filters) as $f) {
# trim whitespace
$f = trim($f);
# skip empty filters
if (!$f)
continue;
# match filter
$md = array();
if (!preg_match(self::$RES['filter'], $f, $md))
throw new Error("invalid filter: $f");
# add filter to results
$r[] = array(
# filter name
'name' => $md['name'],
# filter arguments
'args' => (count($md) > 2) ? preg_split(
self::$RES['delim_args'],
trim($md['args'])
) : array(),
);
}
# return results
return $r;
}
};
final class Template {
private $template, $actions, $o;
public function __construct($template, array $o = array()) {
$this->template = $template;
$this->o = $o;
# parse template into list of actions
$this->actions = Parser::parse_template($template);
}
public function run(array $args = array()) {
# php sucks
$me = $this;
return join('', array_map(function($row) use ($me, $args) {
if ($row['type'] == 'text') {
# literal text
return $row['text'];
} else if ($row['type'] == 'action') {
# template key (possibly with filters)
# check value
if (!isset($args[$row['key']]))
throw new Error("unknown key: {$row['key']}");
# pass value through filters and return result
return array_reduce($row['filters'], function($r, $f) use ($me, $args) {
# get filter
$fn = Filters::get($f['name']);
# call filter and return result
return call_user_func($fn, $r, $f['args'], $args, $me);
}, $args[$row['key']]);
} else {
# should never be reached
throw new Error("unknown action type: {$row['type']}");
}
}, $this->actions));
}
public static function run_once($str, array $args = array()) {
$t = new Template($str);
return $t->run($args);
}
};
final class Cache {
private $templates, $o, $lut = array();
public function __construct(array $templates, array $o = array()) {
$this->templates = $templates;
$this->o = $o;
}
public function get($key) {
if (!isset($this->lut[$key])) {
if (!isset($this->templates[$key]))
throw new Error("unknown template: $key");
# lazy-load template
$this->lut[$key] = new Template($this->templates[$key], $this->o);
}
# return result
return $this->lut[$key];
}
public function run($key, array $args = array()) {
return $this->get($key)->run($args);
}
};
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