vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Validator.php

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<?php

/**
 * Performs validations on HTMLPurifier_ConfigSchema_Interchange
 *
 * @note If you see '// handled by InterchangeBuilder', that means a
 *       design decision in that class would prevent this validation from
 *       ever being necessary. We have them anyway, however, for
 *       redundancy.
 */
class HTMLPurifier_ConfigSchema_Validator
{

    /**
     * @type HTMLPurifier_ConfigSchema_Interchange
     */
    protected $interchange;

    /**
     * @type array
     */
    protected $aliases;

    /**
     * Context-stack to provide easy to read error messages.
     * @type array
     */
    protected $context = array();

    /**
     * to test default's type.
     * @type HTMLPurifier_VarParser
     */
    protected $parser;

    public function __construct()
    {
        $this->parser = new HTMLPurifier_VarParser();
    }

    /**
     * Validates a fully-formed interchange object.
     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
     * @return bool
     */
    public function validate($interchange)
    {
        $this->interchange = $interchange;
        $this->aliases = array();
        // PHP is a bit lax with integer <=> string conversions in
        // arrays, so we don't use the identical !== comparison
        foreach ($interchange->directives as $i => $directive) {
            $id = $directive->id->toString();
            if ($i != $id) {
                $this->error(false, "Integrity violation: key '$i' does not match internal id '$id'");
            }
            $this->validateDirective($directive);
        }
        return true;
    }