PhutilSortVector.php
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PhutilSortVector.php
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	<?php

	final class PhutilSortVector
	extends Phobject {

	private $parts = array();

	public function addInt($value) {
	// We need to produce strings for each integer which sort naturally. This
	// requires some careful manipulation.

	if ($value === ~PHP_INT_MAX) {
	// For the minimum integer value (usually -9223372036854775808 on 64
	// bit systems) we just give it a special "A" prefix to make sure it
	// sorts first.
	$prefix = 'A';
	} else if ($value < 0) {
	// For all other negative values, we give them a "B" prefix, then
	// subtract the value from the maximum integer. This sorts values
	// in ascending order when printed.
	$prefix = 'B';
	$value = PHP_INT_MAX + $value;
	} else {
	// For zero and positive values, we give them a "C" prefix.
	$prefix = 'C';
	}

	$this->parts[] = sprintf('%s%020u', $prefix, $value);
	return $this;
	}

	public function addString($value) {
	if (strlen($value) && (strpos($value, "\0") !== false)) {
	throw new Exception(
	pht(
	'String components of a sort vector must not contain NULL bytes.'));
	}

	$this->parts[] = $value;
	return $this;
	}

	public function __toString() {
	return implode("\0", $this->parts);
	}

	/**
	* This allows you to sort a list of sort vectors using @{function:msortv}.
	*/
	public function getSelf() {
	return $this;
	}

	}