6 files changed, 191 insertions, 0 deletions
diff --git a/ratatoeskr/sys/textprocessors/HtmlProcessor.php b/ratatoeskr/sys/textprocessors/HtmlProcessor.php
new file mode 100644
index 0000000..c3f691b
--- /dev/null
+++ b/ratatoeskr/sys/textprocessors/HtmlProcessor.php
@@ -0,0 +1,20 @@
+<?php
+
+
+namespace r7r\cms\sys\textprocessors;
+
+/**
+ * A simple textprocessor that assumes the input already is HTML.
+ */
+class HtmlProcessor implements Textprocessor
+{
+    public function apply(string $input): string
+    {
+        return $input;
+    }
+
+    public function showInBackend(): bool
+    {
+        return true;
+    }
+}
diff --git a/ratatoeskr/sys/textprocessors/LegacyTextprocessor.php b/ratatoeskr/sys/textprocessors/LegacyTextprocessor.php
new file mode 100644
index 0000000..e7e5cc2
--- /dev/null
+++ b/ratatoeskr/sys/textprocessors/LegacyTextprocessor.php
@@ -0,0 +1,32 @@
+<?php
+
+
+namespace r7r\cms\sys\textprocessors;
+
+/**
+ * LegacyTextprocessor is used to wrap an old-style textprocessor into an Textprocessor object.
+ */
+class LegacyTextprocessor implements Textprocessor
+{
+    /** @var callable */
+    private $fx;
+
+    /** @var bool */
+    private $visible_in_backend;
+
+    public function __construct(callable $fx, $visible_in_backend)
+    {
+        $this->fx = $fx;
+        $this->visible_in_backend = (bool)$visible_in_backend;
+    }
+
+    public function apply(string $input): string
+    {
+        return (string)call_user_func($this->fx, $input);
+    }
+
+    public function showInBackend(): bool
+    {
+        return $this->visible_in_backend;
+    }
+}
diff --git a/ratatoeskr/sys/textprocessors/MarkdownProcessor.php b/ratatoeskr/sys/textprocessors/MarkdownProcessor.php
new file mode 100644
index 0000000..15f2f48
--- /dev/null
+++ b/ratatoeskr/sys/textprocessors/MarkdownProcessor.php
@@ -0,0 +1,22 @@
+<?php
+
+
+namespace r7r\cms\sys\textprocessors;
+
+use Michelf\Markdown;
+
+/**
+ * A textprocessor that uses markdown to generate HTML.
+ */
+class MarkdownProcessor implements Textprocessor
+{
+    public function apply(string $input): string
+    {
+        return Markdown::defaultTransform($input);
+    }
+
+    public function showInBackend(): bool
+    {
+        return true;
+    }
+}
diff --git a/ratatoeskr/sys/textprocessors/PlainTextProcessor.php b/ratatoeskr/sys/textprocessors/PlainTextProcessor.php
new file mode 100644
index 0000000..c8f13f6
--- /dev/null
+++ b/ratatoeskr/sys/textprocessors/PlainTextProcessor.php
@@ -0,0 +1,22 @@
+<?php
+
+
+namespace r7r\cms\sys\textprocessors;
+
+use r7r\cms\sys\Esc;
+
+/**
+ * A textprocessor that simply escapes the input string.
+ */
+class PlainTextProcessor implements Textprocessor
+{
+    public function apply(string $input): string
+    {
+        return Esc::esc($input, Esc::HTML_WITH_BR);
+    }
+
+    public function showInBackend(): bool
+    {
+        return true;
+    }
+}
diff --git a/ratatoeskr/sys/textprocessors/Textprocessor.php b/ratatoeskr/sys/textprocessors/Textprocessor.php
new file mode 100644
index 0000000..90c1347
--- /dev/null
+++ b/ratatoeskr/sys/textprocessors/Textprocessor.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace r7r\cms\sys\textprocessors;
+
+/**
+ * Interface Textprocessor.
+ *
+ * A textprocessor turns an input into HTML.
+ */
+interface Textprocessor
+{
+    public function apply(string $input): string;
+
+    /**
+     * Should this textprocessor be available to the user in the backend?
+     * @return bool
+     */
+    public function showInBackend(): bool;
+}
diff --git a/ratatoeskr/sys/textprocessors/TextprocessorRepository.php b/ratatoeskr/sys/textprocessors/TextprocessorRepository.php
new file mode 100644
index 0000000..5d918c0
--- /dev/null
+++ b/ratatoeskr/sys/textprocessors/TextprocessorRepository.php
@@ -0,0 +1,76 @@
+<?php
+
+
+namespace r7r\cms\sys\textprocessors;
+
+use Exception;
+
+class TextprocessorRepository
+{
+    /** @var Textprocessor[] */
+    private $textprocessors = [];
+
+
+    /**
+     * Builds a repository with the default textprocessors prepopulated.
+     * @return self
+     */
+    public static function buildDefault(): self
+    {
+        $repo = new self();
+
+        $repo->register("Markdown", new MarkdownProcessor());
+        $repo->register("Plain Text", new PlainTextProcessor());
+        $repo->register("HTML", new HtmlProcessor());
+
+        return $repo;
+    }
+
+    public function register(string $name, Textprocessor $textprocessor): void
+    {
+        $this->textprocessors[$name] = $textprocessor;
+    }
+
+    public function getTextprocessor(string $name): ?Textprocessor
+    {
+        return $this->textprocessors[$name] ?? null;
+    }
+
+    /**
+     * @return Textprocessor[]
+     */
+    public function all(): array
+    {
+        return $this->textprocessors;
+    }
+
+    /**
+     * Apply a textprocessor to the input text.
+     *
+     * @param string $input The input text
+     * @param string $name The name of the textprocessor
+     * @return string|null Will return null, if the textprocessor was not found
+     */
+    public function apply(string $input, string $name): ?string
+    {
+        $textprocessor = $this->getTextprocessor($name);
+        return $textprocessor === null ? null : $textprocessor->apply($input);
+    }
+
+    /**
+     * Like {@see TextprocessorRepository::apply()}, but will throw an exception instead of returning null, if the textprocessor was not found.
+     *
+     * @param string $input The input text
+     * @param string $name The name of the textprocessor
+     * @return string
+     * @throws Exception
+     */
+    public function mustApply(string $input, string $name): string
+    {
+        $out = $this->apply($input, $name);
+        if ($out === null) {
+            throw new Exception("Unknown Textprocessor: $name");
+        }
+        return $out;
+    }
+}