From 103332a30f8976fcc224c8f55dc23aba7b99e578 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <LukeShu@sbcglobal.net>
Date: Sun, 4 Sep 2011 20:40:45 -0400
Subject: New router and view selector engine magic coolness.

---
 src/lib/View.class.php | 127 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 src/lib/View.class.php

(limited to 'src/lib/View.class.php')

diff --git a/src/lib/View.class.php b/src/lib/View.class.php
new file mode 100644
index 0000000..ea5ad60
--- /dev/null
+++ b/src/lib/View.class.php
@@ -0,0 +1,127 @@
+<?php
+
+require_once('Mime.class.php');
+require_once('HTTP_Accept.class.php');
+
+/**
+ * A class to handle loading and evaluating the appropriateness of different
+ * views.
+ * 
+ * Depends on the state of the following variables/constants:
+ * PAGE_EXT
+ * VIEWPATH
+ * $_SERVER['HTTP_ACCEPT']
+ */
+class View {
+	private $extensions = array();
+	private $ext = '';
+	private $view = '';
+	
+	/**
+	 * Return the filename of the view file with extension $ext
+	 */
+	private static function filename($view, $ext) {
+		return VIEWPATH."/pages/$view.$ext.php";
+	}
+	
+	/**
+	 * Choose between $extensions, which all have equal quality.
+	 */
+	private function chooseBetweenEquals($extensions) {
+		if (count($extensions)<1) return false;
+		return $extensions[0]; // XXX: Worst. Solution. Ever.
+	}
+
+	/**
+	 * Find the best available extension to use, based on file extension and
+	 *  HTTP 'Accept' headers.
+	 */
+	private function chooseExtension($view) {
+		// Make a list of candidate extensions for this view.
+		$files = glob(self::filename($view, '*'));
+		$this->extensions = array();
+		foreach ($files as $file) {
+			$ext = preg_replace('@[^.]*\.(.*)\.php$@','$1', $file);
+			$this->extensions[] = $ext;
+		}
+		if (count($this->extensions)<1) return false;
+		
+		if (PAGE_EXT != '') {
+			// First, do a check if we can just return requested
+			// file extension:
+			if (in_array(PAGE_EXT, $this->extensions)) {
+				return PAGE_EXT;
+			}
+			
+			// Check for other extensions with the same mime type as
+			// the requested:
+			$accept_str = implode(', ', Mime::ext2mime(PAGE_EXT));
+			$extensions = $this->parseAccept($view, $accept_str);
+			if ($ext = $this->chooseBetweenEquals($extensions)) return $ext;
+		}
+		
+		// Check for other extensions based on HTTP 'Accept' headers:
+		$accept_str = $_SERVER['HTTP_ACCEPT'];
+		$extensions = $this->parseAccept($view, $accept_str);
+		if ($ext = $this->chooseBetweenEquals($extensions)) return $ext;
+		
+		// Well, all the good options failed, so let's see what we've
+		// got left:
+		$extensions = $this->extensions;
+		return $this->chooseBetweenEquals($extensions);
+		
+	}
+	
+	private function parseAccept($view, $accept_str) {
+		// $prefs is a associative array where the key is the file
+		// extension, and the value is how much we like that extension.
+		// Higher numbers are better.
+		$prefs = array();
+
+		$accept = new HTTP_Accept($accept_str);
+
+		// Loop through the candidate views, and record how much we
+		// like each.
+		foreach ($this->extensions as $ext) {
+			$mimes = Mime::ext2mime($ext);
+			foreach ($mimes as $mime) {
+				$quality = $accept->getQuality($mime);
+				if (isset($prefs[$ext])) {
+					$quality = max($prefs[$ext], $quality);
+				}
+				$prefs[$ext] = $quality;
+			}
+		}
+
+		// Create an array of all extensions tied for the top quality.
+		$ret = array();
+		$top_quality = 0.001;// minimum acceptable according to RFC 2616
+		foreach ($prefs as $ext => $quality) {
+			if ($quality > $top_quality) {
+				$top_quality = $quality;
+				$ret = array();
+			}
+			if ($quality == $top_quality) {
+				$ret[] = $ext;
+			}
+		}
+		return $ret;
+	}
+
+	public function __construct($view) {
+		$this->ext = $this->chooseExtension($view);
+		$this->view = $view;
+	}
+
+	public function show($vars) {
+		$file = self::filename($this->view, $this->ext);
+		$mimes = Mime::ext2mime($this->ext);
+		
+		header('Content-type: '.$mimes[0]);
+
+		global $VARS;
+		$VARS = $vars;		
+		include($file);
+		unset($VARS);
+	}
+}
-- 
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