From fa09a6e53be75629da3b401532dd07ca58e08431 Mon Sep 17 00:00:00 2001
From: Klaus Basan <klaus.basan@klausbasan.de>
Date: Tue, 3 Jul 2018 19:35:01 +0200
Subject: [PATCH] Ref T286, JSON utility functions

---
 src/blackmisc/json.cpp | 84 ++++++++++++++++++++++++++++++++++++++++++
 src/blackmisc/json.h   | 23 +++++++++++-
 2 files changed, 106 insertions(+), 1 deletion(-)

diff --git a/src/blackmisc/json.cpp b/src/blackmisc/json.cpp
index 236139e87..d414653bb 100644
--- a/src/blackmisc/json.cpp
+++ b/src/blackmisc/json.cpp
@@ -548,5 +548,89 @@ namespace BlackMisc
         {
             return (object.contains("data"));
         }
+
+        QString firstJsonValueAsString(const QString &json)
+        {
+            static const QString empty;
+            if (json.isEmpty()) { return empty; }
+            const QJsonObject obj = jsonObjectFromString(json);
+            return firstJsonValueAsString(obj);
+        }
+
+        QString firstJsonValueAsString(const QJsonObject &json)
+        {
+            static const QString empty;
+            if (json.isEmpty()) { return empty; }
+            const QStringList keys1 = json.keys();
+            if (keys1.isEmpty()) { return empty; }
+            if (keys1.contains("value", Qt::CaseInsensitive))
+            {
+                return json.value("value").toString();
+            }
+
+            const QJsonObject jsonLevel1 = json.value(keys1.front()).toObject();
+            return jsonLevel1.value("value").toString();
+        }
+
+        QStringList firstJsonValueAsStringList(const QString &json)
+        {
+            static const QStringList empty;
+            if (json.isEmpty()) { return empty; }
+            const QJsonObject obj = jsonObjectFromString(json);
+            return firstJsonValueAsStringList(obj);
+        }
+
+        int firstJsonValueAsInt(const QString &json, int defaultValue, bool *ok)
+        {
+            if (ok) { *ok = false; }
+            if (json.isEmpty()) { return defaultValue; }
+            const QJsonObject obj = jsonObjectFromString(json);
+            return firstJsonValueAsInt(obj, defaultValue, ok);
+        }
+
+        int firstJsonValueAsInt(const QJsonObject &json, int defaultValue, bool *ok)
+        {
+            if (ok) { *ok = false; }
+            if (json.isEmpty()) { return defaultValue; }
+            const QStringList keys1 = json.keys();
+            if (keys1.isEmpty()) { return defaultValue; }
+            if (keys1.contains("value", Qt::CaseInsensitive))
+            {
+                if (ok) { *ok = true; }
+                return json.value("value").toInt(defaultValue);
+            }
+
+            const QJsonObject jsonLevel1 = json.value(keys1.front()).toObject();
+            if (!jsonLevel1.contains("value")) { return defaultValue; }
+            if (ok) { *ok = true; }
+            return jsonLevel1.value("value").toInt(defaultValue);
+        }
+
+        QStringList firstJsonValueAsStringList(const QJsonObject &json)
+        {
+            static const QStringList empty;
+            if (json.isEmpty()) { return empty; }
+            const QStringList keys1 = json.keys();
+            if (keys1.isEmpty()) { return empty; }
+            if (keys1.contains("value", Qt::CaseInsensitive))
+            {
+                return arrayToQStringList(json.value("value").toArray());
+            }
+
+            const QJsonObject jsonLevel1 = json.value(keys1.front()).toObject();
+            return arrayToQStringList(jsonLevel1.value("value").toArray());
+        }
+
+        QStringList arrayToQStringList(const QJsonArray &array)
+        {
+            QStringList sl;
+            if (array.isEmpty()) { return sl; }
+            for (int i = 0; i < array.size(); i++)
+            {
+                if (!array.at(i).isString()) { continue; }
+                sl.push_back(array.at(i).toString());
+            }
+            return sl;
+        }
     } // ns
 } // ns
diff --git a/src/blackmisc/json.h b/src/blackmisc/json.h
index 7dda8f859..d5c76dd94 100644
--- a/src/blackmisc/json.h
+++ b/src/blackmisc/json.h
@@ -24,7 +24,7 @@
 #include <QJsonObject>
 #include <QJsonValue>
 #include <QJsonValueRef>
-#include <QString>
+#include <QStringList>
 #include <QtGlobal>
 #include <type_traits>
 #include <utility>
@@ -247,6 +247,27 @@ namespace BlackMisc
         //! \ingroup JSON
         BLACKMISC_EXPORT QJsonArray jsonArrayFromString(const QString &json);
 
+        //! First JSON string object marked as "value"
+        BLACKMISC_EXPORT QString firstJsonValueAsString(const QString &json);
+
+        //! First JSON string object marked as "value"
+        BLACKMISC_EXPORT QString firstJsonValueAsString(const QJsonObject &json);
+
+        //! First JSON string object marked as "value"
+        BLACKMISC_EXPORT int firstJsonValueAsInt(const QString &json, int defaultValue = -1, bool *ok = nullptr);
+
+        //! First JSON string object marked as "value"
+        BLACKMISC_EXPORT int firstJsonValueAsInt(const QJsonObject &json, int defaultValue = -1, bool *ok = nullptr);
+
+        //! First JSON string list object marked as "value"
+        BLACKMISC_EXPORT QStringList firstJsonValueAsStringList(const QString &json);
+
+        //! First JSON string list object marked as "value"
+        BLACKMISC_EXPORT QStringList firstJsonValueAsStringList(const QJsonObject &json);
+
+        //! JSON array to QStringList
+        BLACKMISC_EXPORT QStringList arrayToQStringList(const QJsonArray &array);
+
         //! Creates an incremental json object from two existing objects
         BLACKMISC_EXPORT QJsonObject getIncrementalObject(const QJsonObject &previousObject, const QJsonObject &currentObject);