PhutilProseDiff.php
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	<?php

	final class PhutilProseDiff extends Phobject {

	private $parts = array();

	public function addPart($type, $text) {
	$this->parts[] = array(
	'type' => $type,
	'text' => $text,
	);
	return $this;
	}

	public function getParts() {
	return $this->parts;
	}

	public function reorderParts() {
	// Reorder sequences of removed and added sections to put all the "-"
	// parts together first, then all the "+" parts together. This produces
	// a more human-readable result than intermingling them.
	$o_run = array();
	$n_run = array();
	$result = array();
	foreach ($this->parts as $part) {
	$type = $part['type'];
	switch ($type) {
	case '-':
	$o_run[] = $part;
	break;
	case '+':
	$n_run[] = $part;
	break;
	default:
	foreach ($o_run as $o) {
	$result[] = $o;
	}
	foreach ($n_run as $n) {
	$result[] = $n;
	}
	$result[] = $part;
	$o_run = array();
	$n_run = array();
	break;
	}
	}

	foreach ($o_run as $o) {
	$result[] = $o;
	}
	foreach ($n_run as $n) {
	$result[] = $n;
	}

	// Now, combine consecuitive runs of the same type of change (like a
	// series of "-" parts) into a single run.
	$combined = array();

	$last = null;
	$last_text = null;
	foreach ($result as $part) {
	$type = $part['type'];

	if ($last !== $type) {
	$combined[] = array(
	'type' => $last,
	'text' => $last_text,
	);
	$last_text = null;
	$last = $type;
	}

	$last_text .= $part['text'];
	}

	if ($last_text !== null) {
	$combined[] = array(
	'type' => $last,
	'text' => $last_text,
	);
	}

	$this->parts = $combined;

	return $this;
	}

	}