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<?php
/**
* Context.php - template parser symbol table
*
* A Context object represents the symbol table used to resolve
* symbol names to their values in the local scope. Each context
* may inherit symbol definitions from its parent context.
*
* @copyright 2013 Elmar Ludwig
* @license GPL2 or any later version
*/
namespace exTpl;
use Closure;
class Context
{
private array $bindings;
private Closure|null $escape;
private Context|null $parent;
/**
* Initializes a new Context instance with the given bindings.
*
* @param array $bindings symbol table
* @param Context|null $parent parent context (or NULL)
*/
public function __construct(array $bindings, Context $parent = null)
{
$this->bindings = $bindings;
$this->parent = $parent;
}
/**
* Looks up the value of a symbol in this context and returns it.
* The reserved symbol "this" is an alias for the current context.
*
* @param string $key symbol name
*/
public function lookup(string $key): mixed
{
if (isset($this->bindings[$key])) {
return $this->bindings[$key];
} else if ($this->parent) {
return $this->parent->lookup($key);
}
return null;
}
/**
* Enables or disables automatic escaping for template values.
*
* @param callable|null $escape escape callback or null
*/
public function autoescape(?callable $escape): void
{
$this->escape = $escape ? $escape(...) : null;
}
/**
* Escapes the given value using the configured strategy.
*
* @param mixed $value expression value
*/
public function escape(mixed $value): mixed
{
if (isset($this->escape)) {
$value = call_user_func($this->escape, $value);
} else if ($this->parent) {
$value = $this->parent->escape($value);
}
return $value;
}
}
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