LengthSpec.php
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LengthSpec.php
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	<?php

	namespace MediaWiki\Extension\Math\WikiTexVC\Nodes;

	use InvalidArgumentException;

	class LengthSpec extends TexNode {
	private string $sign;
	private string $unit;
	private string $number;

	public function __construct( ?string $sign, array $number, string $unit ) {
	$this->sign = $sign ?? '';
	$this->unit = $unit;
	if ( count( $number ) === 3 ) {

	$this->number = implode( $number[0] ) . ( $number[1] ?? '' ) . implode( $number[2] );
	} elseif ( count( $number ) === 2 ) {
	$this->number = ( $number[0] ?? '' ) . implode( $number[1] );
	} else {
	throw new InvalidArgumentException( 'Invalid number in length spec' );
	}
	parent::__construct();
	}

	/** @inheritDoc */
	public function render() {
	return '[' . $this->sign . $this->number . $this->unit . ']';
	}

	}