Import simple Photoshop text as editable text (12.11b2)

src/IO/PSD/PSDText+Engine.h

@@ -0,0 +1,27 @@
+#pragma once
+#include <QByteArray>
+#include <QString>
+#include <map>
+#include <optional>
+#include <variant>
+#include <vector>
+
+// Photoshop's text-engine dictionary, a small PostScript subset.
+namespace PSDTextEngine {
+struct Engine;
+using Dictionary = std::map<QString, Engine>;
+using Array = std::vector<Engine>;
+
+struct Engine {
+    std::variant<double, bool, QString, Dictionary, Array> value;
+};
+
+std::optional<Engine> parse(const QByteArray &data);
+// Swift's `walk`: nested dictionary keys, else none.
+const Engine *walk(const Engine *value, std::initializer_list<const char *> keys);
+std::optional<double> number(const Engine *value);
+std::optional<bool> boolean(const Engine *value);
+std::optional<QString> string(const Engine *value);
+// An array's items; anything else reads empty.
+Array array(const Engine *value);
+}