diff options
Diffstat (limited to 'php/luigi-template.php')
| -rw-r--r-- | php/luigi-template.php | 542 |
1 files changed, 326 insertions, 216 deletions
diff --git a/php/luigi-template.php b/php/luigi-template.php index df4f38e..69e3fb8 100644 --- a/php/luigi-template.php +++ b/php/luigi-template.php @@ -1,283 +1,393 @@ <?php +declare(strict_types = 1); namespace Luigi; -const VERSION = '0.4.0'; +const VERSION = '0.4.2'; -final class Error extends \Exception {}; +class Error extends \Exception {}; -final class Filters { - private static $filters = null; +class UnknownTypeError extends Error { + public $type, + $name; - public static function init() { - if (self::$filters !== null) - return; + public function __construct(string $type, string $name) { + $this->type = $type; + $this->name = $name; + parent::__construct("unknown $type: $name"); + } +}; + +final class UnknownTemplateError extends UnknownTypeError { + public function __construct(string $name) { + parent::__construct('template', $name); + } +}; - self::$filters = array( - 'h' => function($s) { - return htmlspecialchars($v); - }, +final class UnknownFilterError extends UnknownTypeError { + public function __construct(string $name) { + parent::__construct('filter', $name); + } +}; - 'u' => function($s) { - return urlencode($v); - }, +final class UnknownKeyError extends UnknownTypeError { + public function __construct(string $name) { + parent::__construct('key', $name); + } +}; - 'json' => function($v) { - return json_encode($v); - }, +final class MissingFilterParameterError extends Error { + public $filter_name; - 'hash' => function($v, $args) { - $algo = (count($args) == 1) ? $args[0] : 'md5'; - return hash($algo, $v); - }, + public function __construct(string $filter_name) { + $this->filter_name = $filter_name; + parent::__construct("missing required filter parameter for filter $filter_name"); + } +}; - 'base64' => function($v) { - return base64_encode($v); - }, +final class InvalidTemplateError extends Error { + public $template; - 'nl2br' => function($v) { - return nl2br($v); - }, + public function __construct(string $template) { + $this->template = $template; + parent::__construct("invalid template: $template"); + } +}; - 'uc' => function($v) { - return strtoupper($v); - }, +namespace Luigi; - 'lc' => function($v) { - return strtolower($v); - }, +final class RunContext { + public $args, + $filters; - 'trim' => function($v) { - return trim($v); - }, + public function __construct(array $args, array $filters) { + $this->args = $args; + $this->filters = $filters; + } +}; - 'rtrim' => function($v) { - return rtrim($v); - }, +final class TemplateFilter { + private $name, + $args; - 'ltrim' => function($v) { - return ltrim($v); - }, + public function __construct(string $name, array $args) { + $this->name = $name; + $this->args = $args; + } - 's' => function($v) { - return ($v == 1) ? '' : 's'; - }, + public function run($v, array &$args, array &$filters) { + if (!isset($filters[$this->name])) { + throw new UnknownFilterError($this->name); + } - 'strlen' => function($v) { - return strlen($v); - }, + # get callback + $cb = $filters[$this->name]; - 'count' => function($v) { - return count($v); - }, - ); + # invoke callback, return result + return $cb($v, $this->args, $args); } +}; - public static function get($key) { - self::init(); +namespace Luigi\Parser; + +use Luigi\RunContext; +use Luigi + +abstract class Token { + public function run(array $args, array $filters) : string; +}; - if (!isset(self::$filters[$key])) - throw new Error("unknown filter: $key"); +final class LiteralToken extends Token { + private $val; - return self::$filters[$key]; + public function __construct(string $val) { + $this->val = $val; } - public static function add(array $filters) { - self::init(); - self::$filters = array_merge(self::$filters, $filters); + public function run(array &$args, array &$filters) : string { + return $this->val; } }; -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); +final class FilterToken extends Token { + private $key, + $filters; - # return result - return $r; + public function __construct(string $key, array $filters) { + $this->key = $key; + $this->filters = $filters; } - public static function parse_filters($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(), - ); + public function run(array &$args, array &$filters) : string { + if (!isset($args[$this->key])) { + throw new UnknownKeyError($this->key); + } + + # get initial value + $r = $args[$this->key]; + + if ($this->filters && count($this->filters) > 0) { + # pass value through filters + $r = array_reduce($this->filters, function($r, $f) use (&$args, &$filters) { + return $f->run($r, $args, $filters); + }, $r); } - # return results + # return result return $r; } }; -final class Template { - private $template, $filters, $actions +const TOKEN_RE = '/ + # match opening brace + %\{ - public function __construct($template, $filters = null) { - $this->template = $template; - $this->filters = $filters; + # match optional whitespace + \s* + + # match key + (?<key>[^\s\|\}]+) + + # match filter(s) + (?<filters>(\s*\|(\s*[^\s\|\}]+)+)*) - # parse template into list of actions - $this->actions = Parser::parse_template($template); + # match optional whitespace + \s* + + # match closing brace + \} + + # or match up all non-% chars or a single % char + | (?<text>[^%]* | %) +/mx'; + +const FILTER_RE = '/ + # match filter name + (?<name>\S+) + + # match filter arguments (optional) + (?<args>(\s*\S+)*) + + # optional trailing whitespace + \s* +/mx'; + +const DELIM_FILTERS_RE = '/\s*\|\s*/m'; + +const DELIM_ARGS_RE = '/\s+/m'; + +function parse_filters(string $filters) : array { + # split into individual filters + $r = []; + + foreach (preg_split(DELIM_FILTERS_RE, $filters) as $f) { + # trim whitespace + $f = trim($f); + + # skip empty filters + if (!$f) + continue; + + # match filter + $md = []; + if (!preg_match(FILTER_RE, $f, $md)) { + throw new UnknownFilterError($f); + } + + # add filter to results + $r[] = new TemplateFilter($md['name'], (count($md) > 2) ? preg_split( + DELIM_ARGS_RE, + trim($md['args']) + ) : []); } - public function run(array $args = array()) { - # php sucks - $me = $this; + # return results + return $r; +} - return join('', array_map(function($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 = $me->get_filter($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)); +function parse_template(string $template) : array { + # build list of matches + $matches = []; + $num_matches = preg_match_all(TOKEN_RE, $template, $matches, PREG_SET_ORDER); + + # check for error + if ($num_matches === false) { + throw new InvalidTemplateError($template); } - public function get_filter($key) { - if ($this->filters) { - # use custom filters - return $this->filters->get($key); + # map matches to tokens + return array_map(function($m) { + if ($m['key'] !== '') { + # filter token + return new FilterToken($m['key'], parse_filters($m['filters'])); } else { - # default to built-in filters - return Filters::get($key); + # literal token + return new LiteralToken($m['text']); + } + }, $matches); +} + +namespace Luigi; + +public $FILTERS = [ + 'h' => function($s) { + return htmlspecialchars($v, ENT_QUOTES); + }, + + 'u' => function($s) { + return urlencode($v); + }, + + 'json' => function($v) { + return json_encode($v); + }, + + 'hash' => function($v, $args) { + if (count($args) !== 1) { + throw new MissingFilterParameterError('hash'); + } + + return hash($args[0], $v); + }, + + 'base64' => function($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($v); + }, + + 'key' => function($v, $args) { + if (count($args) !== 1) { + throw new MissingFilterParameterError('key'); } + + # get key + $key = $args[0]; + + # make sure key exists + if (!isset($v[$key])) { + throw new UnknownKeyError($key); + } + + # return key + return $v[$key]; + }, +]; + +final class Template { + private $template, + $filters, + $tokens; + + public function __construct( + string $template, + array $custom_filters = [] + ) { + global $FILTERS; + + $this->template = $template; + $this->filters = count($custom_filters) ? $custom_filters : $FILTERS; + + # parse template into list of tokens + $this->tokens = Parser\parse_template($template); } - public static function run_once($str, $args = array(), $filters = null) { + public function run(array $args = []) : string { + # php sucks + $me = $this; + + return join('', array_map(function($token) use ($me, $args) { + return $token->run($args, $this->filters); + }, $this->tokens)); + } + + public static function once($str, $args = [], array $filters = []) { $t = new Template($str, $filters); return $t->run($args); } }; -final class Cache { - private $templates, $filters, $lut = array(); - - public function __construct(array $templates, $filters = null) { +public function run( + string $template, + array $args = [], + array $filters = [] +) : string { + $t = new Template($template, $filters); + return $t->run($args); +} + +final class Cache implements \ArrayAccess { + private $templates, + $filters, + $lut = []; + + public function __construct(array $templates, array $filters = []) { $this->templates = $templates; $this->filters = $filters; - $this->o = $o; } - public function get($key) { - if (!isset($this->lut[$key])) { - if (!isset($this->templates[$key])) - throw new Error("unknown template: $key"); + public function offsetExists($key) : bool { + return isset($this->templates[$key]); + } - # lazy-load template + public function offsetGet($key) { + if (isset($this->lut[$key])) { + return $this->lut[$key]; + } else if (isset($this->templates[$key]) { $this->lut[$key] = new Template($this->templates[$key], $this->filters); + return $this->lut[$key]; + } else { + throw new UnknownTemplateError($key); } + } - # return result - return $this->lut[$key]; + public function offsetUnset($key) { + delete($this->lut[$key]); + delete($this->templates[$key]); } - public function run($key, array $args = array()) { - return $this->get($key)->run($args); + public function offsetSet($key, $val) : bool { + delete($this->lut[$key]); + $this->templates[$key] = $val; + return isset($this->templates[$key]); + } + + + public function run(string $key, array $args = []) : string { + return $this->offsetGet($key)->run($args); } }; |