simple cache for rendered files

1 files changed, 84 insertions, 0 deletions

diff --git a/src/phorkie/Renderer/Cache.php b/src/phorkie/Renderer/Cache.php
new file mode 100644
index 0000000..4137b05
--- /dev/null
+++ b/src/phorkie/Renderer/Cache.php
@@ -0,0 +1,84 @@
+<?php
+namespace phorkie;
+
+class Renderer_Cache
+{
+    /**
+     * Converts the code to HTML by fetching it from cache,
+     * or by letting the other renderes generate it and then
+     * storing it in the cache.
+     *
+     * @param File        $file File to render
+     * @param Tool_Result $res  Tool result to integrate
+     *
+     * @return string HTML
+     */
+    public function toHtml(File $file, Tool_Result $res = null)
+    {
+        $html = null;
+        $cacheFile = $this->getCacheFile($file);
+        if ($res === null && $cacheFile !== null) {
+            $html = $this->loadHtmlFromCache($cacheFile);
+        }
+        if ($html === null) {
+            $html = $this->renderFile($file, $res);
+            if ($res === null && $cacheFile !== null) {
+                $this->storeHtmlIntoCache($cacheFile, $html);
+            }
+        }
+        return $html;
+    }
+
+    protected function renderFile(File $file, Tool_Result $res = null)
+    {
+        $ext   = $file->getExt();
+        $class = '\\phorkie\\Renderer_Unknown';
+
+        if (isset($GLOBALS['phorkie']['languages'][$ext]['renderer'])) {
+            $class = $GLOBALS['phorkie']['languages'][$ext]['renderer'];
+        } else if ($file->isText()) {
+            $class = '\\phorkie\\Renderer_Geshi';
+        } else if (isset($GLOBALS['phorkie']['languages'][$ext]['mime'])) {
+            $type = $GLOBALS['phorkie']['languages'][$ext]['mime'];
+            if (substr($type, 0, 6) == 'image/') {
+                $class = '\\phorkie\\Renderer_Image';
+            }
+        }
+
+        $rend = new $class();
+        return $rend->toHtml($file, $res);
+    }
+
+    /**
+     * @return null|string NULL when there is no cache, string with HTML
+     *                     otherwise
+     */
+    protected function loadHtmlFromCache($cacheFile)
+    {
+        if (!file_exists($cacheFile)) {
+            return null;
+        }
+        return file_get_contents($cacheFile);
+    }
+
+    protected function storeHtmlIntoCache($cacheFile, $html)
+    {
+        file_put_contents($cacheFile, $html);
+    }
+
+    protected function getCacheFile(File $file)
+    {
+        if (!$GLOBALS['phorkie']['cfg']['cachedir']
+            || !is_dir($GLOBALS['phorkie']['cfg']['cachedir'])
+        ) {
+            return null;
+        }
+
+        return $GLOBALS['phorkie']['cfg']['cachedir']
+            . '/' . $file->repo->id
+            . '-' . $file->repo->hash
+            . '-' . str_replace('/', '-', $file->getFilename())
+            . '.html';
+    }
+}
+?>