ScalarParam.php

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<?php
 
namespace Wikimedia\Message;
 
class ScalarParam extends MessageParam {
    public function __construct( $type, $value ) {
        if ( $type === ParamType::LIST ) {
            throw new \InvalidArgumentException(
                'ParamType::LIST cannot be used with ScalarParam; use ListParam instead'
            );
        }
        if ( !is_string( $value ) && !is_numeric( $value ) && !$value instanceof MessageValue ) {
            $type = is_object( $value ) ? get_class( $value ) : gettype( $value );
            throw new \InvalidArgumentException(
                "Scalar parameter must be a string, number, or MessageValue; got $type"
            );
        }
 
        $this->type = $type;
        $this->value = $value;
    }
 
    public function dump() {
        if ( $this->value instanceof MessageValue ) {
            $contents = $this->value->dump();
        } else {
            $contents = htmlspecialchars( $this->value );
        }
        return "<{$this->type}>" . $contents . "</{$this->type}>";
    }
}