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Standalone View

				<?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;
				}

				}