[mod] Persistenz

source/helpers.php

@@ -28,6 +28,59 @@ function cache_get(string $key, \Closure $retrieve)
 }
 
 
+/**
+ */
+function database_map_type(string $type)
+{
+	switch ($type)
+	{
+		case 'integer': return \SQLITE3_INTEGER;
+		case 'string': return \SQLITE3_TEXT;
+		default: throw (new \Exception(\sprintf('unhandled type: %s', $type)));
+	}
+}
+
+
+/**
+ */
+function database_get(string $query_template, array $arguments) : array
+{
+	$connection = new \SQLite3('data.sqlite');
+	$rows = $connection->query($query_template);
+	/*
+$query = "SELECT * FROM books";
+$result = $db->query($query);
+
+while ($row = $result->fetchArray(SQLITE3_ASSOC)) {
+	 */
+}
+
+
+/**
+ */
+function database_put(string $query_template, array $arguments) : int
+{
+	$connection = new \SQLite3('data.sqlite');
+	$statement = $connection->prepare($query);
+	foreach ($arguments as $key => $value)
+	{
+		$statement->bindValue(
+			\sprintf(':%s', $key),
+			$value['value'],
+			database_map_type($value['type'])
+		);
+	}
+	if ($statement->execute()) {
+		// SELECT last_insert_rowid()
+		echo "Buch erfolgreich hinzugefügt!";
+	}
+	else
+	{
+		echo "Fehler beim Hinzufügen des Buches: " . $db->lastErrorMsg();
+	}
+}
+
+
 /**
  */
 function string_coin(string $template, array $arguments) : string
@@ -41,6 +94,114 @@ function string_coin(string $template, array $arguments) : string
 }
 
 
+/**
+ */
+class class_crud_jsonfile
+{
+	private string $path;
+	
+	private \Closure $id_encode;
+	
+	private \Closure $id_decode;
+	
+	public function __construct(
+		string $path,
+		\Closure $id_encode,
+		\Closure $id_decode
+	)
+	{
+		$this->path = $path;
+		$this->id_encode = $id_encode;
+		$this->id_decode = $id_decode;
+	}
+	
+	private function get() : array
+	{
+		$content = (\file_exists($this->path) ? \file_get_contents($this->path) : null);
+		return (
+			($content === null)
+			?
+			['last_id' => 0, 'entries' => []]
+			:
+			\json_decode($content, true)
+		);
+	}
+	
+	private function put(array $data) : void
+	{
+		$content = \json_encode($data, \JSON_PRETTY_PRINT);
+		\file_put_contents($this->path, $content);
+	}
+	
+	public function list_() : array
+	{
+		$data = $this->get();
+		return \array_map(
+			fn ($id_encoded) => [
+				'id' => ($this->id_decode)($id_encoded),
+				'value' => $data['entries'][$id_encoded],
+			],
+			\array_keys($data['entries'])
+		);
+	}
+	
+	public function read(int $id)
+	{
+		$data = $this->get();
+		$id_encoded = ($this->id_encode)($id);
+		if (! \array_key_exists($id_encoded, $data['entries']))
+		{
+			throw (new \Exception('not found'));
+		}
+		else
+		{
+			return $data['entries'][$id_encoded];
+		}
+	}
+	
+	public function create($value) : int
+	{
+		$data = $this->get();
+		$id = ($data['last_id'] + 1);
+		$id_encoded = ($this->id_encode)($id);
+		$data['last_id'] = $id;
+		$data['entries'][$id_encoded] = $value;
+		$this->put($data);
+		return $id;
+	}
+
+	public function update(int $id, $value) : void
+	{
+		$data = $this->get();
+		$id_encoded = ($this->id_encode)($id);
+		if (! \array_key_exists($id_encoded, $data['entries']))
+		{
+			throw (new \Exception('not found'));
+		}
+		else
+		{
+			$data['entries'][$id_encoded] = $value;
+			$this->put($data);
+		}
+	}
+
+	public function delete(int $id) : void
+	{
+		$data = $this->get();
+		$id_encoded = ($this->id_encode)($id);
+		if (! \array_key_exists($id_encoded, $data['entries']))
+		{
+			throw (new \Exception('not found'));
+		}
+		else
+		{
+			unset($data['entries'][$id_encoded]);
+			$this->put($data);
+		}
+	}
+}
+
+
 /**
  */
 function render(string $template_name, array $arguments) : string

source/index.html.php

@@ -7,7 +7,7 @@ require_once(__DIR__ . '/logic.php');
 
 $mode = ($_GET['mode'] ?? 'list');
 $id_encoded = (! empty($_GET['id']) ? $_GET['id'] : null);
-$id = (($id_encoded === null) ? null : \rosavox\logic\docs_id_decode($id_encoded));
+$id = (($id_encoded === null) ? null : \intval($id_encoded));
 
 
 function nav(string $mode, array $args) : void
@@ -37,15 +37,10 @@ function nav(string $mode, array $args) : void
 		<link rel="stylesheet" type="text/css" href="/style.css"/>
 	</head>
 	<body>
+		<h1>rosavox</h1>
 <?php
 	switch ($mode)
 	{
-		case 'example':
-		{
-			\rosavox\logic\docs_add_examples();
-			nav('list', []);
-			break;
-		}
 		case 'list':
 		{
 			echo(
@@ -58,13 +53,15 @@ function nav(string $mode, array $args) : void
 								fn ($entry) => \rosavox\helpers\render(
 									'docs-list-entry',
 									[
-										'link' => \rosavox\helpers\string_coin(
+										'link_open' => \rosavox\helpers\string_coin(
 											'?mode=edit&id={{id}}',
 											[
 												'id' => $entry['id'],
 											]
 										),
-										'text' => $entry['doc']['title'],
+										'link_read' => '#not_implemented',
+										'link_hear' => '#not_implemented',
+										'text' => $entry['value']['title'],
 									]
 								),
 								\rosavox\logic\docs_list()

source/logic.php

@@ -9,60 +9,7 @@ require_once(__DIR__ . '/helpers.php');
  */
 class docs_state
 {
-	public static int $current_id = 0;
+	public static ?\rosavox\helpers\class_crud_jsonfile $crud = null;
-	
-	/**
-	 * @param array {record<string,array>}
-	 */
-	public static array $pool = [];
-}
-
-
-/**
- */
-function docs_push() : void
-{
-	$path = 'docs.json';
-	$data = [
-		'current_id' => docs_state::$current_id,
-		'pool' => docs_state::$pool,
-	];
-	$content = \json_encode($data, \JSON_PRETTY_PRINT);
-	\file_put_contents($path, $content);
-}
-
-
-/**
- */
-function docs_pull() : void
-{
-	$path = 'docs.json';
-	$content = (\file_exists($path) ? \file_get_contents($path) : null);
-	$data = (
-		($content === null)
-		?
-		['current_id' => 0, 'pool' => []]
-		:
-		\json_decode($content, true)
-	);
-	docs_state::$current_id = $data['current_id'];
-	docs_state::$pool = $data['pool'];
-}
-
-
-/**
- */
-function docs_id_encode(int $id) : string
-{
-	return \sprintf('%u', $id);
-}
-
-
-/**
- */
-function docs_id_decode(string $id_encoded) : int
-{
-	return intval($id_encoded);
 }
 
 
@@ -70,13 +17,7 @@ function docs_id_decode(string $id_encoded) : int
  */
 function docs_list() : array
 {
-	return \array_map(
+	return docs_state::$crud->list_();
-		fn ($id_encoded) => [
-			'id' => docs_id_decode($id_encoded),
-			'doc' => docs_state::$pool[$id_encoded],
-		],
-		\array_keys(docs_state::$pool)
-	);
 }
 
 
@@ -84,15 +25,7 @@ function docs_list() : array
  */
 function docs_read(int $id) : array
 {
-	$id_encoded = docs_id_encode($id);
+	return docs_state::$crud->read($id);
-	if (! \array_key_exists($id_encoded, docs_state::$pool))
-	{
-		throw (new \Exception('not found'));
-	}
-	else
-	{
-		return docs_state::$pool[$id_encoded];
-	}
 }
 
 
@@ -100,12 +33,7 @@ function docs_read(int $id) : array
  */
 function docs_create(array $doc) : int
 {
-	docs_state::$current_id += 1;
+	return docs_state::$crud->create($doc);
-	$id = docs_state::$current_id;
-	$id_encoded = docs_id_encode($id);
-	docs_state::$pool[$id_encoded] = $doc;
-	docs_push();
-	return $id;
 }
 
 
@@ -113,16 +41,7 @@ function docs_create(array $doc) : int
  */
 function docs_update(int $id, array $doc) : void
 {
-	$id_encoded = docs_id_encode($id);
+	docs_state::$crud->update($id, $doc);
-	if (! \array_key_exists($id_encoded, docs_state::$pool))
-	{
-		throw (new \Exception('not found'));
-	}
-	else
-	{
-		docs_state::$pool[$id_encoded] = $doc;
-		docs_push();
-	}
 }
 
 
@@ -130,25 +49,7 @@ function docs_update(int $id, array $doc) : void
  */
 function docs_delete(int $id) : void
 {
-	$id_encoded = docs_id_encode($id);
+	docs_state::$crud->delete($id);
-	if (! \array_key_exists($id_encoded, docs_state::$pool))
-	{
-		throw (new \Exception('not found'));
-	}
-	else
-	{
-		docs_state::$pool[$id_encoded] = null;
-		unset(docs_state::$pool[$id_encoded]);
-		docs_push();
-	}
-}
-
-
-/**
- */
-function docs_init() : void
-{
-	docs_pull();
 }
 
 
@@ -169,4 +70,24 @@ function docs_add_examples() : void
 	);
 }
 
+
+/**
+ */
+function docs_init() : void
+{
+	docs_state::$crud = new \rosavox\helpers\class_crud_jsonfile(
+		'docs.json',
+		fn ($id) => \sprintf('%u', $id),
+		fn ($id_encoded) => \intval($id_encoded)
+	);
+	if (empty(docs_state::$crud->list_()))
+	{
+		docs_add_examples();
+	}
+	else
+	{
+		// do nothing
+	}
+}
+
  ?>

source/templates/docs-list-entry.html.tpl

@@ -1,3 +1,5 @@
 <li class="docs-list-entry">
-	<a href="{{link}}">{{text}}</a>
+	<a href="{{link_open}}">{{text}}</a>
+	| <a href="{{link_read}}">[lesen]</a>
+	| <a href="{{link_hear}}">[hören]</a>
 </li>