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[3.1.0] De-crudify the ConfigSchema space; we're starting over again

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- Optimize ConfigSchema by removing non-essential runtime data. We can probably optimize even more by collapsing object structures to arrays.
- Removed validation data from ConfigSchema; this will be reimplemented on Interchange
- Implement a sane Interchange composite hierarchy that doesn't use arrays
- Implement StringHash -> Interchange -> ConfigSchema, and rewrite maintenance file to account for this

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1615 48356398-32a2-884e-a903-53898d9a118a
This commit is contained in:
Edward Z. Yang
2008-03-22 03:55:59 +00:00
parent 93babf0a88
commit ec59062a9d
42 changed files with 440 additions and 1528 deletions
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48
library/HTMLPurifier/ConfigSchema/Builder/ConfigSchema.php Normal file
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@@ -0,0 +1,48 @@
<?php
/**
* Converts HTMLPurifier_ConfigSchema_Interchange to our runtime
* representation used to perform checks on user configuration.
*/
class HTMLPurifier_ConfigSchema_Builder_ConfigSchema
{
public function build($interchange) {
$schema = new HTMLPurifier_ConfigSchema();
foreach ($this->namespaces as $n) {
$schema->addNamespace($n->namespace);
}
foreach ($this->directives as $d) {
$schema->add(
$d->id->namespace,
$d->id->directive,
$d->default,
$d->type,
$d->typeAllowsNull
);
if ($d->allowed !== null) {
$schema->addAllowedValues(
$d->id->namespace,
$d->id->directive,
$d->allowed
);
}
foreach ($d->aliases as $alias) {
$schema->addAlias(
$alias->id->namespace,
$alias->id->directive,
$d->id->namespace,
$d->id->directive
);
}
if ($d->valueAliases !== null) {
$schema->addValueAliases(
$d->id->namespace,
$d->id->directive,
$d->valueAliases
);
}
}
}
}

62
library/HTMLPurifier/ConfigSchema/Interchange.php
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@@ -21,69 +21,15 @@ class HTMLPurifier_ConfigSchema_Interchange
/**
* Adds a namespace array to $namespaces
*/
public function addNamespace($arr) {
$this->namespaces[$arr['ID']] = $arr;
public function addNamespace($namespace) {
$this->namespaces[$namespace->namespace] = $namespace;
}
/**
* Adds a directive array to $directives
*/
public function addDirective($arr) {
$this->directives[$arr['ID']] = $arr;
}
/**
* Retrieves a version of this object wrapped in the validator adapter
* to be used for data-input.
*/
public function getValidatorAdapter() {
$validator = new HTMLPurifier_ConfigSchema_InterchangeValidator($this);
// Validators should be defined in the order they are to be called.
$namespace = $validator->namespace;
$directive = $validator->directive;
// ID tests
$validator->addValidator($this->make('Exists', 'ID'));
$validator->addValidator($this->make('Unique'));
// ID: Namespace test
$namespace->addValidator($this->make('Alnum', 'ID'));
// ID: Common tests
$validator->addValidator($this->make('ParseId'));
$validator->addValidator($this->make('Exists', '_NAMESPACE'));
$validator->addValidator($this->make('Alnum', '_NAMESPACE'));
// ID: Directive tests
$directive->addValidator($this->make('Exists', '_DIRECTIVE'));
$directive->addValidator($this->make('Alnum', '_DIRECTIVE'));
$directive->addValidator($this->make('NamespaceExists'));
// Directive: Type and Default tests
$directive->addValidator($this->make('Exists', 'TYPE'));
$directive->addValidator($this->make('ParseType'));
$directive->addValidator($this->make('Exists', '_TYPE'));
$directive->addValidator($this->make('Exists', '_NULL'));
$directive->addValidator($this->make('Exists', 'DEFAULT'));
$directive->addValidator($this->make('ParseDefault'));
// Common tests
$validator->addValidator($this->make('Exists', 'DESCRIPTION'));
return $validator;
}
/**
* Creates a validator.
* @warning
* Only *one* argument is supported; multiple args shouldn't use
* this function.
*/
protected function make($name, $arg = null) {
$class = "HTMLPurifier_ConfigSchema_Validator_$name";
if ($arg === null) return new $class();
else return new $class($arg);
public function addDirective($directive) {
$this->directives[(string) $directive->id] = $directive;
}
}

70
library/HTMLPurifier/ConfigSchema/Interchange/Directive.php Normal file
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@@ -0,0 +1,70 @@
<?php
/**
* Interchange component class describing configuration directives.
*/
class HTMLPurifier_ConfigSchema_Interchange_Directive
{
/**
* ID of directive, instance of HTMLPurifier_ConfigSchema_Interchange_Id.
*/
public $id;
/**
* String type, e.g. 'integer' or 'istring'.
*/
public $type;
/**
* Default value, e.g. 3 or 'DefaultVal'.
*/
public $default;
/**
* HTML description.
*/
public $description;
/**
* Boolean whether or not null is allowed as a value.
*/
public $typeAllowsNull = false;
/**
* Lookup table of allowed scalar values, e.g. array('allowed' => true).
* Null if all values are allowed.
*/
public $allowed;
/**
* List of aliases for the directive, e.g. array('Alt.Directive').
*/
public $aliases = array();
/**
* Hash of value aliases, e.g. array('alt' => 'real'). Null if value
* aliasing is disabled (necessary for non-scalar types).
*/
public $valueAliases;
/**
* Version of HTML Purifier the directive was introduced, e.g. '1.3.1'.
* Null if the directive has always existed.
*/
public $version;
/**
* ID of directive that supercedes this old directive, is an instance
* of HTMLPurifier_ConfigSchema_Interchange_Id. Null if not deprecated.
*/
public $deprecatedUse;
/**
* Version of HTML Purifier this directive was deprecated. Null if not
* deprecated.
*/
public $deprecatedVersion;
}

25
library/HTMLPurifier/ConfigSchema/Interchange/Id.php Normal file
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@@ -0,0 +1,25 @@
<?php
/**
* Represents a directive ID in the interchange format.
*/
class HTMLPurifier_ConfigSchema_Interchange_Id
{
public $namespace, $directive;
public function __construct($namespace, $directive) {
$this->namespace = $namespace;
$this->directive = $directive;
}
public function __toString() {
return $this->namespace . '.' . $this->directive;
}
public static function make($id) {
list($namespace, $directive) = explode('.', $id);
return new HTMLPurifier_ConfigSchema_Interchange_Id($namespace, $directive);
}
}

19
library/HTMLPurifier/ConfigSchema/Interchange/Namespace.php Normal file
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@@ -0,0 +1,19 @@
<?php
/**
* Interchange component class describing namespaces.
*/
class HTMLPurifier_ConfigSchema_Interchange_Namespace
{
/**
* Name of namespace defined.
*/
public $namespace;
/**
* HTML description.
*/
public $description;
}

109
library/HTMLPurifier/ConfigSchema/InterchangeBuilder.php Normal file
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@@ -0,0 +1,109 @@
<?php
class HTMLPurifier_ConfigSchema_InterchangeBuilder
{
protected $varParser;
public function __construct($varParser = null) {
$this->varParser = $varParser ? $varParser : new HTMLPurifier_VarParser_Native();
}
/**
* Builds an interchange object based on a hash.
* @param $interchange HTMLPurifier_ConfigSchema_Interchange object to build
* @param $hash HTMLPurifier_ConfigSchema_StringHash source data
*/
public function build($interchange, $hash) {
if (strpos($hash['ID'], '.') === false) {
$this->buildNamespace($interchange, $hash);
} else {
$this->buildDirective($interchange, $hash);
}
$this->_findUnused($hash);
}
public function buildNamespace($interchange, $hash) {
$namespace = new HTMLPurifier_ConfigSchema_Interchange_Namespace();
$namespace->namespace = $hash->offsetGet('ID');
$namespace->description = $hash->offsetGet('DESCRIPTION');
$interchange->addNamespace($namespace);
}
public function buildDirective($interchange, $hash) {
$directive = new HTMLPurifier_ConfigSchema_Interchange_Directive();
// These are required elements:
$directive->id = $this->id($hash->offsetGet('ID'));
$type = explode('/', $hash->offsetGet('TYPE'));
if (isset($type[1])) $directive->typeAllowsNull = true;
$directive->type = $type[0];
$directive->description = $directive->offsetGet('DESCRIPTION');
// These are extras:
if (isset($directive['ALLOWED'])) {
$directive->allowed = $this->lookup($this->evalArray($directive->offsetGet('ALLOWED')));
}
if (isset($directive['VALUE-ALIASES'])) {
$directive->valueAliases = $this->evalArray($directive->offsetGet('VALUE-ALIASES'));
}
if (isset($directive['ALIASES'])) {
$raw_aliases = trim($hash->offsetGet('ALIASES'));
$aliases = preg_split('/\s*,\s*/', $raw_aliases);
foreach ($aliases as $alias) {
$this->aliases[] = $this->id($alias);
}
}
if (isset($directive['VERSION'])) {
$directive->version = $directive->offsetGet('VERSION');
}
if (isset($directive['DEPRECATED-USE'])) {
$directive->deprecatedUse = $this->id($directive->offsetGet('DEPRECATED-USE'));
}
if (isset($directive['DEPRECATED-VERSION'])) {
$directive->deprecatedVersion = $directive->offsetGet('DEPRECATED-VERSION');
}
$interchange->addDirective($directive);
}
/**
* Evaluates an array PHP code string without array() wrapper
*/
protected function evalArray($contents) {
return eval('return array('. $contents .');');
}
/**
* Converts an array list into a lookup array.
*/
protected function lookup($array) {
$ret = array();
foreach ($array as $val) $ret[$val] = true;
return $ret;
}
/**
* Convenience function that creates an HTMLPurifier_ConfigSchema_Interchange_Id
* object based on a string Id.
*/
protected function id($id) {
return HTMLPurifier_ConfigSchema_Interchange_Id::make($id);
}
/**
* Triggers errors for any unused keys passed in the hash; such keys
* may indicate typos, missing values, etc.
* @param $hash Instance of ConfigSchema_StringHash to check.
*/
protected function _findUnused($hash) {
$accessed = $hash->getAccessed();
foreach ($hash as $k => $v) {
if (!isset($accessed[$k])) {
trigger_error("String hash key '$k' not used by builder", E_USER_NOTICE);
}
}
}
}

89
library/HTMLPurifier/ConfigSchema/StringHashAdapter.php
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@@ -1,89 +0,0 @@
<?php
/**
* Takes an array of keys to strings, probably generated by
* HTMLPurifier_ConfigSchema_StringHashParser
*/
class HTMLPurifier_ConfigSchema_StringHashAdapter
{
/**
* Takes a string hash and calls the appropriate functions in $schema
* based on its values.
*/
public function adapt($hash, $schema) {
if (! $hash instanceof HTMLPurifier_ConfigSchema_StringHash) {
$hash = new HTMLPurifier_ConfigSchema_StringHash($hash);
}
if (!isset($hash['ID'])) {
trigger_error('Missing key ID in string hash');
return;
}
// Check namespace:
if (strpos($hash['ID'], '.') === false) {
// This will cause problems if we decide to support nested
// namespaces, but for now it's ok.
$schema->addNamespace($hash->offsetGet('ID'), $hash->offsetGet('DESCRIPTION'));
$this->_findUnused($hash);
return;
}
list($ns, $directive) = explode('.', $hash->offsetGet('ID'), 2);
if (isset($hash['TYPE'], $hash['DEFAULT'], $hash['DESCRIPTION'])) {
$type = $hash->offsetGet('TYPE');
$raw_default = $hash->offsetGet('DEFAULT');
$default = eval("return $raw_default;");
$description = $hash->offsetGet('DESCRIPTION');
$schema->add($ns, $directive, $default, $type, $description);
}
if (isset($hash['ALLOWED'])) {
$raw_allowed = $hash->offsetGet('ALLOWED');
$allowed = eval("return array($raw_allowed);");
$schema->addAllowedValues($ns, $directive, $allowed);
}
// This must be after ALLOWED
if (isset($hash['VALUE-ALIASES'])) {
$raw_value_aliases = $hash->offsetGet('VALUE-ALIASES');
$value_aliases = eval("return array($raw_value_aliases);");
$schema->addValueAliases($ns, $directive, $value_aliases);
}
if (isset($hash['ALIASES'])) {
$raw_aliases = trim($hash->offsetGet('ALIASES'));
$aliases = preg_split('/\s*,\s*/', $raw_aliases);
foreach ($aliases as $alias) {
list($alias_ns, $alias_directive) = explode('.', $alias, 2);
$schema->addAlias($alias_ns, $alias_directive, $ns, $directive);
}
}
// We don't use these yet, but they're specified
if (isset($hash['VERSION'])) $hash->offsetGet('VERSION');
if (isset($hash['DEPRECATED-USE'])) $hash->offsetGet('DEPRECATED-USE');
if (isset($hash['DEPRECATED-VERSION'])) $hash->offsetGet('DEPRECATED-VERSION');
$this->_findUnused($hash);
}
/**
* Triggers errors for any unused keys passed in the hash; such keys
* may indicate typos, missing values, etc.
* @param $hash Instance of ConfigSchema_StringHash to check.
*/
protected function _findUnused($hash) {
$accessed = $hash->getAccessed();
foreach ($hash as $k => $v) {
if (!isset($accessed[$k])) {
trigger_error("String hash key '$k' not used by adapter", E_USER_NOTICE);
}
}
}
}

127
library/HTMLPurifier/ConfigSchema/StringHashReverseAdapter.php
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@@ -1,127 +0,0 @@
<?php
/**
* Converts HTMLPurifier_ConfigSchema into a StringHash which can be
* easily saved to a file.
*/
class HTMLPurifier_ConfigSchema_StringHashReverseAdapter
{
protected $schema;
/**
* @param $schema Instance of HTMLPurifier_ConfigSchema to generate
* string hashes from.
*/
public function __construct($schema) {
$this->schema = $schema;
}
/**
* Retrieves a string hash from a specific ID, could be a directive
* or a namespace.
* @param $ns string namespace
* @param $directive string directive name
*/
public function get($ns, $directive = null) {
$ret = array();
if ($directive === null) {
if (!isset($this->schema->info_namespace[$ns])) {
trigger_error("Namespace '$ns' doesn't exist in schema");
return;
}
$def = $this->schema->info_namespace[$ns];
$ret['ID'] = $ns;
$ret['DESCRIPTION'] = $def->description;
return $ret;
}
if (!isset($this->schema->info[$ns][$directive])) {
trigger_error("Directive '$ns.$directive' doesn't exist in schema");
return;
}
$def = $this->schema->info[$ns][$directive];
if ($def instanceof HTMLPurifier_ConfigDef_DirectiveAlias) {
return false;
}
$ret['ID'] = "$ns.$directive";
$ret['TYPE'] = $def->type;
// Attempt to extract version information from description.
$description = $this->normalize($def->description);
list($description, $version) = $this->extractVersion($description);
if ($version) $ret['VERSION'] = $version;
$ret['DEFAULT'] = $this->export($this->schema->defaults[$ns][$directive]);
$ret['DESCRIPTION'] = wordwrap($description, 75, "\n");
if ($def->allowed !== true) {
$ret['ALLOWED'] = $this->exportLookup($def->allowed);
}
if (!empty($def->aliases)) {
$ret['VALUE-ALIASES'] = $this->exportHash($def->aliases);
}
if (!empty($def->directiveAliases)) {
$ret['ALIASES'] = implode(', ', $def->directiveAliases);
}
return $ret;
}
/**
* Exports a variable into a PHP-readable format
*/
public function export($var) {
if ($var === array()) return 'array()'; // single-line format
return var_export($var, true);
}
/**
* Exports a lookup array into the form 'key1', 'key2', ...
*/
public function exportLookup($lookup) {
if (!is_array($lookup)) return $this->export($lookup);
if (empty($lookup)) return '';
$keys = array_map(array($this, 'export'), array_keys($lookup));
return implode(', ', $keys);
}
/**
* Exports a hash into the form 'key' => 'val',\n ...
*/
public function exportHash($hash) {
if (!is_array($hash)) return $this->export($hash);
if (empty($hash)) return '';
$code = $this->export($hash);
$lines = explode("\n", $code);
$ret = '';
foreach ($lines as $line) {
if ($line == 'array (') continue;
if ($line == ')') continue;
$ret .= substr($line, 2) . "\n";
}
return $ret;
}
/**
* Normalizes a string to Unix style newlines
*/
protected function normalize($string) {
return str_replace(array("\r\n", "\r"), "\n", $string);
}
public function extractVersion($description) {
$regex = '/This directive (?:has been|was) available since (\d+\.\d+\.\d+)\./';
$regex = str_replace(' ', '\s+', $regex); // allow any number of spaces between statements
$ok = preg_match($regex, $description, $matches);
if ($ok) {
$version = $matches[1];
} else {
$version = false;
}
$description = preg_replace($regex, '', $description, 1);
return array($description, $version);
}
}

26
library/HTMLPurifier/ConfigSchema/Validator.php
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@@ -1,26 +0,0 @@
<?php
/**
* Base validator for HTMLPurifier_ConfigSchema_Interchange
*/
class HTMLPurifier_ConfigSchema_Validator
{
/**
* Common validator, throwing an exception on error. It can
* also performing filtering or evaluation functions.
*
* @param $arr Array to validate.
* @param $interchange HTMLPurifier_ConfigSchema_Interchange object
* that is being processed.
*/
public function validate(&$arr, $interchange) {}
/**
* Throws a HTMLPurifier_ConfigSchema_Exception
*/
protected function error($msg) {
throw new HTMLPurifier_ConfigSchema_Exception($msg);
}
}

22
library/HTMLPurifier/ConfigSchema/Validator/Alnum.php
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@@ -1,22 +0,0 @@
<?php
/**
* Validates that a field is alphanumeric in the array. Expects $index
* to exist.
*/
class HTMLPurifier_ConfigSchema_Validator_Alnum extends HTMLPurifier_ConfigSchema_Validator
{
protected $index;
public function __construct($index) {
$this->index = $index;
}
public function validate(&$arr, $interchange) {
if (!ctype_alnum($arr[$this->index])) {
$this->error($arr[$this->index] . ' in '. $this->index .' must be alphanumeric');
}
}
}

21
library/HTMLPurifier/ConfigSchema/Validator/Composite.php
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@@ -1,21 +0,0 @@
<?php
/**
* Groups several validators together, which can be used with logical validators
*/
class HTMLPurifier_ConfigSchema_Validator_Composite extends HTMLPurifier_ConfigSchema_Validator
{
protected $validators = array();
public function addValidator($validator) {
$this->validators[] = $validator;
}
public function validate(&$arr, $interchange) {
foreach ($this->validators as $validator) {
$validator->validate($arr, $interchange);
}
}
}

21
library/HTMLPurifier/ConfigSchema/Validator/Exists.php
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@@ -1,21 +0,0 @@
<?php
/**
* Validates that an field exists in the array
*/
class HTMLPurifier_ConfigSchema_Validator_Exists extends HTMLPurifier_ConfigSchema_Validator
{
protected $index;
public function __construct($index) {
$this->index = $index;
}
public function validate(&$arr, $interchange) {
if (empty($arr[$this->index])) {
$this->error($this->index . ' must exist');
}
}
}

49
library/HTMLPurifier/ConfigSchema/Validator/If.php
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@@ -1,49 +0,0 @@
<?php
/**
* If a validator passes, run another validator.
*/
class HTMLPurifier_ConfigSchema_Validator_If extends HTMLPurifier_ConfigSchema_Validator
{
protected $condition;
protected $then;
protected $else;
public function __construct($cond = null) {
$this->setCondition($cond);
}
/**
* @param $validator Validator to run as a condition. Exceptions thrown by it
* do not bubble up.
*/
public function setCondition($validator) {
$this->condition = $validator;
}
/**
* @param $validator Validator to run if condition is true
*/
public function setThen($validator) {
$this->then = $validator;
}
/**
* @param $validator Validator to run if condition is false
*/
public function setElse($validator) {
$this->else = $validator;
}
public function validate(&$arr, $interchange) {
try {
$this->condition->validate($arr, $interchange);
} catch (HTMLPurifier_ConfigSchema_Exception $e) {
if ($this->else) $this->else->validate($arr, $interchange);
return;
}
if ($this->then) $this->then->validate($arr, $interchange);
}
}

16
library/HTMLPurifier/ConfigSchema/Validator/NamespaceExists.php
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@@ -1,16 +0,0 @@
<?php
/**
* Validates that the directive's namespace exists. Expects _NAMESPACE
* to have been created via HTMLPurifier_ConfigSchema_Validator_ParseId
*/
class HTMLPurifier_ConfigSchema_Validator_NamespaceExists extends HTMLPurifier_ConfigSchema_Validator
{
public function validate(&$arr, $interchange) {
if (!isset($interchange->namespaces[$arr['_NAMESPACE']])) {
$this->error('Cannot define directive for undefined namespace ' . $arr['_NAMESPACE']);
}
}
}

39
library/HTMLPurifier/ConfigSchema/Validator/Or.php
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@@ -1,39 +0,0 @@
<?php
/**
* Groups several validators together, but as an 'or': if the first
* one passes, we abort; if it throws an exception, we try the next validator,
* and the next. If all validators fail, we throw an exception.
*
* @note If no validators are registered, this validator automatically
* "passes".
*/
class HTMLPurifier_ConfigSchema_Validator_Or extends HTMLPurifier_ConfigSchema_Validator
{
protected $validators = array();
public function addValidator($validator) {
$this->validators[] = $validator;
}
public function validate(&$arr, $interchange) {
$exceptions = array();
$pass = false;
foreach ($this->validators as $validator) {
try {
$validator->validate($arr, $interchange);
} catch (HTMLPurifier_ConfigSchema_Exception $e) {
$exceptions[] = $e;
continue;
}
$exceptions = array();
break;
}
if ($exceptions) {
// I wonder how we can make the exceptions "lossless"
throw new HTMLPurifier_ConfigSchema_Exception('All validators failed: ' . implode(";\n", $exceptions));
}
}
}

18
library/HTMLPurifier/ConfigSchema/Validator/ParseDefault.php
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@@ -1,18 +0,0 @@
<?php
/**
* Parses DEFAULT into _DEFAULT. Expects DEFAULT, _TYPE, _NULL and ID to exist.
*/
class HTMLPurifier_ConfigSchema_Validator_ParseDefault extends HTMLPurifier_ConfigSchema_Validator
{
public function validate(&$arr, $interchange) {
$parser = new HTMLPurifier_VarParser_Native(); // not configurable yet
try {
$arr['_DEFAULT'] = $parser->parse($arr['DEFAULT'], $arr['_TYPE'], $arr['_NULL']);
} catch (HTMLPurifier_VarParserException $e) {
throw new HTMLPurifier_ConfigSchema_Exception('Invalid type for default value in '. $arr['ID'] .': ' . $e->getMessage());
}
}
}

15
library/HTMLPurifier/ConfigSchema/Validator/ParseId.php
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@@ -1,15 +0,0 @@
<?php
/**
* Parses ID into NAMESPACE and, if appropriate, DIRECTIVE. Expects ID to exist.
*/
class HTMLPurifier_ConfigSchema_Validator_ParseId extends HTMLPurifier_ConfigSchema_Validator
{
public function validate(&$arr, $interchange) {
$r = explode('.', $arr['ID'], 2);
$arr['_NAMESPACE'] = $r[0];
if (isset($r[1])) $arr['_DIRECTIVE'] = $r[1];
}
}

19
library/HTMLPurifier/ConfigSchema/Validator/ParseType.php
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@@ -1,19 +0,0 @@
<?php
/**
* Parses TYPE into _TYPE and _NULL. Expects TYPE and ID to exist.
*/
class HTMLPurifier_ConfigSchema_Validator_ParseType extends HTMLPurifier_ConfigSchema_Validator
{
public function validate(&$arr, $interchange) {
$r = explode('/', $arr['TYPE'], 2);
if (!isset(HTMLPurifier_VarParser::$types[$r[0]])) {
$this->error('Invalid type ' . $r[0] . ' for configuration directive ' . $arr['ID']);
}
$arr['_TYPE'] = $r[0];
$arr['_NULL'] = (isset($r[1]) && $r[1] === 'null');
}
}

23
library/HTMLPurifier/ConfigSchema/Validator/Unique.php
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@@ -1,23 +0,0 @@
<?php
/**
* Validates that this ID does not exist already in the interchange object.
* Expects ID to exist.
*
* @note
* Although this tests both possible values, in practice the ID
* will only be in one or the other. We do this to keep things simple.
*/
class HTMLPurifier_ConfigSchema_Validator_Unique extends HTMLPurifier_ConfigSchema_Validator
{
public function validate(&$arr, $interchange) {
if (isset($interchange->namespaces[$arr['ID']])) {
$this->error('Cannot redefine namespace');
}
if (isset($interchange->directives[$arr['ID']])) {
$this->error('Cannot redefine directive');
}
}
}