1 files changed, 49 insertions, 0 deletions
diff --git a/plugin/src/Caelestia/qalculator.cpp b/plugin/src/Caelestia/qalculator.cpp
new file mode 100644
index 0000000..2e18033
--- /dev/null
+++ b/plugin/src/Caelestia/qalculator.cpp
@@ -0,0 +1,49 @@
+#include "qalculator.hpp"
+
+#include <QObject>
+#include <libqalculate/qalculate.h>
+
+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);
+}