Plugins/ZShell/CMakeLists.txt

@@ -43,6 +43,7 @@ qml_module(ZShell
         imageanalyser.hpp imageanalyser.cpp
 		requests.hpp requests.cpp
 		toaster.hpp toaster.cpp
+		qalculator.hpp qalculator.cpp
     LIBRARIES
         Qt::Gui
         Qt::Quick

Plugins/ZShell/qalculator.cpp

@@ -0,0 +1,52 @@
+#include "qalculator.hpp"
+
+#include <libqalculate/qalculate.h>
+
+namespace ZShell {
+
+Qalculator::Qalculator(QObject* parent)
+	: QObject(parent) {
+	if (!CALCULATOR) {
+		new Calculator();
+		CALCULATOR->loadExchangeRates();
+		CALCULATOR->loadGlobalDefinitions();
+		CALCULATOR->loadLocalDefinitions();
+	}
+}
+
+QString Qalculator::eval(const QString& expr, bool printExpr) const {
+	if (expr.isEmpty()) {
+		return QString();
+	}
+
+	EvaluationOptions eo;
+	PrintOptions po;
+
+	std::string parsed;
+	std::string result = CALCULATOR->calculateAndPrint(
+		CALCULATOR->unlocalizeExpression(expr.toStdString(), eo.parse_options), 100, eo, po, &parsed);
+
+	std::string error;
+	while (CALCULATOR->message()) {
+		if (!CALCULATOR->message()->message().empty()) {
+			if (CALCULATOR->message()->type() == MESSAGE_ERROR) {
+				error += "error: ";
+			} else if (CALCULATOR->message()->type() == MESSAGE_WARNING) {
+				error += "warning: ";
+			}
+			error += CALCULATOR->message()->message();
+		}
+		CALCULATOR->nextMessage();
+	}
+	if (!error.empty()) {
+		return QString::fromStdString(error);
+	}
+
+	if (printExpr) {
+		return QString("%1 = %2").arg(parsed).arg(result);
+	}
+
+	return QString::fromStdString(result);
+}
+
+} // namespace ZShell

Plugins/ZShell/qalculator.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <qobject.h>
+#include <qqmlintegration.h>
+
+namespace ZShell {
+
+class Qalculator : public QObject {
+Q_OBJECT
+QML_ELEMENT
+QML_SINGLETON
+
+public:
+explicit Qalculator(QObject* parent = nullptr);
+
+Q_INVOKABLE QString eval(const QString& expr, bool printExpr = true) const;
+};
+
+} // namespace ZShell