PhutilProseDiff.php
b3aa54fb9460stable

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;
			}

			}