nur-sery/src/schema/Schema.php

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<?php
namespace nur\sery\schema;
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use ArrayAccess;
use LogicException;
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use nulib\cl;
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use nur\sery\schema\_assoc\AssocSchema;
use nur\sery\schema\_list\ListSchema;
use nur\sery\schema\_scalar\ScalarSchema;
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abstract class Schema implements ArrayAccess {
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/**
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* créer si besoin une nouvelle instance de {@link Schema} à partir d'une
* définition de schéma
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*/
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static function ns(?Schema &$schema, $definition, $definitionKey=null): self {
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if ($schema === null) {
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if (AssocSchema::isa_definition($definition)) {
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$schema = new AssocSchema($definition, $definitionKey);
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} elseif (ListSchema::isa_definition($definition)) {
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$schema = new ListSchema($definition, $definitionKey);
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} elseif (ScalarSchema::isa_definition($definition)) {
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$schema = new ScalarSchema($definition, $definitionKey);
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} else {
throw SchemaException::invalid_schema();
}
}
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return $schema;
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}
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/**
* Créer si besoin une nouvelle instance de {@link Value} qui référence la
* variable $dest
*/
static function nv(?Value &$value=null, &$dest=null, $key=null, ?Schema &$schema=null, $definition=null): Value {
if ($definition === null) {
# bien que techniquement, $definition peut être null (il s'agit alors du
# schéma d'un scalaire quelconque), on ne l'autorise pas ici
throw SchemaException::invalid_schema("definition is required");
}
return self::ns($schema, $definition)->newValue($value, $dest, $key);
}
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/**
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* @var array définition du schéma, à redéfinir le cas échéant dans une classe
* dérivée
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*/
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const SCHEMA = null;
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/** @var array */
protected $definition;
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/** retourner true si le schéma est de nature tableau associatif */
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function isAssoc(?AssocSchema &$assoc=null): bool { return false; }
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/** retourner true si le schéma est de nature liste */
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function isList(?ListSchema &$list=null): bool { return false; }
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/** retourner true si le schéma est de nature scalaire */
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function isScalar(?ScalarSchema &$scalar=null): bool { return false; }
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abstract function newValue(?Value &$value=null, &$dest=null, $key=null): Value;
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#############################################################################
# key & properties
function offsetExists($offset): bool {
return array_key_exists($offset, $this->definition);
}
function offsetGet($offset) {
if (!array_key_exists($offset, $this->definition)) return null;
else return $this->definition[$offset];
}
function offsetSet($offset, $value): void {
throw new LogicException("read-only");
}
function offsetUnset($offset): void {
throw new LogicException("read-only");
}
const _PROPERTY_PKEYS = [];
function __get($name) {
$pkey = cl::get(static::_PROPERTY_PKEYS, $name, $name);
return cl::pget($this->definition, $pkey);
}
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}