books/scripts/books.php

<?php

include ("books_xml.php");

function get_books() {
	return library_to_html();
}

function library_to_html() {
	$html = "";
	$library = get_library();
	$library->sort_by($_GET['sort']);
	$library->to_html($html);
	return $html;
}

class Library {
	var $books;

	function Library() {
		$this->books = array ();
	}

	function add_book(& $book) {
		$this->books[] = $book;
	}

	function to_html(& $html) {
		$html .= "<div class=\"homeitem3col\">";
		$html .= "<h3>Books</h3>";
		$html .= "<ul>";
		foreach ($this->books as $book) {
			$book->to_html($html);
		}
		$html .= "</ul>";
		$html .= "</div>";
	}

	function sort_by($field) {
		if (!in_array($field, array("title", "date", "author")))
			$field = "date";
		usort($this->books, "sort_by_" . $field . "_cmp");
	}
}

function sort_by_title_cmp($a, $b) {
	$a_title = as_sortable_title($a->title);
	$b_title = as_sortable_title($b->title);
	return strcasecmp($a_title, $b_title);
}

function as_sortable_title($title) {
	$title = trim($title);
	if (strcasecmp(substr($title, 0, 3), "the") == 0) {
		$title = substr($title, 3);
	}
	return trim($title);
		
}

function sort_by_date_cmp($a, $b) {
	if ($a->date == $b->date)
		return 0;
	return $a->date > $b->date ? -1 : 1;
}

function sort_by_author_cmp($a, $b) {
	$a_author = $a->authors[0];
	$b_author = $b->authors[0];
	$cmp = strcasecmp($a_author, $b_author);
	if ($cmp == 0) return sort_by_date_cmp($a, $b);
	return $cmp;
}

class Book {
	var $title;
	var $authors;
	var $date;
	var $url;
	var $description;

	function Book() {
		$this->authors = array ();
	}

	function add_author(& $author) {
		$this->authors[] = $author;
	}

	// Render the book as html.
	function to_html(& $html) {
		$html .= "<li><b><a href=\"$this->url\" target=\"_blank\">$this->title</a></b>";

		// Get the collection of authors and render them.
		$authors = $this->authors_to_html($this->authors);
		if ($authors) {
			$html .= "<br>";
			$html .= str_replace("[uuml]", "&uuml;", $authors);
		}
		if ($this->date) {
			$html .= "<br>";
			$html .= date("F Y", $this->date);
		}

		$description = $this->description;
		if ($description)
			$html .= "<blockquote>$description</blockquote>";
	}

	function authors_to_html($authors) {
		$count = count($authors);

		if ($count == 0)
			return;

		$html = ' by ';
		$html .= author_to_html($authors[0]);

		// Print each of the authors, excluding the first and the last
		for ($index = 1; $index < $count -1; $index ++) {
			$html .= ", ";
			$html .= author_to_html($authors[$index]);
		}

		// If there are more than two authors, then we need to separate
		// the last one from the second last one with a comma.
		if ($count > 2) {
			$html .= ",";
		}

		// If there was more than one author, then print the last author's
		// information
		if ($count > 1) {
			$author = $authors[$count -1];
			if (strlen($author) == 0) // empty author means "et al."
				$html .= " et al.";
			else {
				$html .= " and ";
				$html .= author_to_html($author);
			}
		}

		return $html;
	}
}

function author_to_html($author) {
	$parts = explode(",", $author);
	if (count($parts) == 1)
		return $author;

	return trim($parts[1])." ".trim($parts[0]);
}


?>