Introduce a Qt-free JSON implementation

This is essentially QJson with Qt replaced by std:: features.

This is useful to have in circumstances where a Qt dependency
is undesirable, e.g. for the Qt Creator debugger protocol
implementation in our CDB extension.

Change-Id: Iec79c6b23b1e717ce1b6f4d38755287d1f479c13
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

4 files changed, 368 insertions, 0 deletions

diff --git a/tests/benchmarks/json/json.pro b/tests/benchmarks/json/json.pro
new file mode 100644
index 0000000000..9356968265
--- /dev/null
+++ b/tests/benchmarks/json/json.pro
@@ -0,0 +1,14 @@
+TARGET = tst_bench_json
+QT = core testlib
+CONFIG -= app_bundle
+
+SOURCES += tst_bench_json.cpp
+
+TESTDATA = numbers.json test.json
+
+
+INCLUDEPATH += ../../../src/shared/json
+
+#DEFINES += QT_NO_CAST_TO_ASCII QT_NO_CAST_FROM_ASCII
+
+include(../../../src/shared/json/json.pri)
diff --git a/tests/benchmarks/json/numbers.json b/tests/benchmarks/json/numbers.json
new file mode 100644
index 0000000000..469156a78a
--- /dev/null
+++ b/tests/benchmarks/json/numbers.json
@@ -0,0 +1,19 @@
+[
+    {
+        "integer": 1234567890,
+        "real": -9876.543210,
+        "e": 0.123456789e-12,
+        "E": 1.234567890E+34,
+        "":  23456789012E66,
+        "zero": 0,
+        "one": 1
+     },
+     [
+        -1234567890,
+        -1234567890,
+        -1234567890,
+        1234567890,
+        1234567890,
+        1234567890
+     ]
+]
diff --git a/tests/benchmarks/json/test.json b/tests/benchmarks/json/test.json
new file mode 100644
index 0000000000..330756894a
--- /dev/null
+++ b/tests/benchmarks/json/test.json
@@ -0,0 +1,66 @@
+[
+    "JSON Test Pattern pass1",
+    {"object with 1 member":["array with 1 element"]},
+    {},
+    [],
+    -42,
+    true,
+    false,
+    null,
+    {
+        "integer": 1234567890,
+        "real": -9876.543210,
+        "e": 0.123456789e-12,
+        "E": 1.234567890E+34,
+        "":  23456789012E66,
+        "zero": 0,
+        "one": 1,
+        "space": " ",
+        "quote": "\"",
+        "backslash": "\\",
+        "controls": "\b\f\n\r\t",
+        "slash": "/ & \/",
+        "alpha": "abcdefghijklmnopqrstuvwxyz",
+        "ALPHA": "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
+        "digit": "0123456789",
+        "0123456789": "digit",
+        "special": "`1~!@#$%^&*()_+-={\':[,]}|;.</>?",
+        "hex": "\u0123\u4567\u89AB\uCDEF\uabcd\uef4A",
+        "true": true,
+        "false": false,
+        "null": null,
+        "array":[  ],
+        "object":{  },
+        "address": "50 St. James Street",
+        "url": "nix",
+        "comment": "// /* <!-- --",
+        "# -- --> */": " ",
+        " s p a c e d " :[1,2 , 3
+
+,
+
+4 , 5        ,          6           ,7        ],"compact":[1,2,3,4,5,6,7],
+        "jsontext": "{\"object with 1 member\":[\"array with 1 element\"]}",
+        "quotes": "&#34; \u0022 %22 0x22 034 &#x22;",
+        "\/\"\uCAFE\uBABE\uAB98\uFCDE\ubcda\uef4A\b\f\n\r\t`1~!@#$%^&*()_+-=[]{}|;:\',./<>?" : "A key can be any string"
+    },
+    0.5 ,98.6
+,
+99.44
+,
+
+1066,
+1e1,
+0.1e1,
+1e-1,
+1e00,
+2e+00,
+2e-00,
+"rosebud",
+{"foo": "bar"},
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+]
+
diff --git a/tests/benchmarks/json/tst_bench_json.cpp b/tests/benchmarks/json/tst_bench_json.cpp
new file mode 100644
index 0000000000..0248195064
--- /dev/null
+++ b/tests/benchmarks/json/tst_bench_json.cpp
@@ -0,0 +1,269 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtTest>
+#include <qjsondocument.h>
+#include <qjsonobject.h>
+
+#include <json.h>
+
+using namespace Json;
+
+class BenchmarkJson: public QObject
+{
+    Q_OBJECT
+
+public:
+    BenchmarkJson() {}
+
+private Q_SLOTS:
+    void jsonObjectInsertQt();
+    void jsonObjectInsertStd();
+
+    void createBinaryMessageQt();
+    void createBinaryMessageStd();
+
+    void readBinaryMessageQt();
+    void readBinaryMessageStd();
+
+    void createTextMessageQt();
+    void createTextMessageStd();
+
+    void readTextMessageQt();
+    void readTextMessageStd();
+
+    void parseJsonQt();
+    void parseJsonStd();
+
+    void parseNumbersQt();
+    void parseNumbersStd();
+};
+
+void BenchmarkJson::parseNumbersQt()
+{
+    QString testFile = QFINDTESTDATA("numbers.json");
+    QVERIFY2(!testFile.isEmpty(), "cannot find test file numbers.json!");
+    QFile file(testFile);
+    file.open(QFile::ReadOnly);
+    QByteArray testJson = file.readAll();
+
+    QBENCHMARK {
+        QJsonDocument doc = QJsonDocument::fromJson(testJson);
+        doc.object();
+    }
+}
+
+void BenchmarkJson::parseNumbersStd()
+{
+    QString testFile = QFINDTESTDATA("numbers.json");
+    QVERIFY2(!testFile.isEmpty(), "cannot find test file numbers.json!");
+    QFile file(testFile);
+    file.open(QFile::ReadOnly);
+    std::string testJson = file.readAll().toStdString();
+
+    QBENCHMARK {
+        JsonDocument doc = JsonDocument::fromJson(testJson);
+        doc.object();
+    }
+}
+
+void BenchmarkJson::parseJsonQt()
+{
+    QString testFile = QFINDTESTDATA("test.json");
+    QVERIFY2(!testFile.isEmpty(), "cannot find test file test.json!");
+    QFile file(testFile);
+    file.open(QFile::ReadOnly);
+    QByteArray testJson = file.readAll();
+
+    QBENCHMARK {
+        QJsonDocument doc = QJsonDocument::fromJson(testJson);
+        doc.object();
+    }
+}
+
+void BenchmarkJson::parseJsonStd()
+{
+    QString testFile = QFINDTESTDATA("test.json");
+    QVERIFY2(!testFile.isEmpty(), "cannot find test file test.json!");
+    QFile file(testFile);
+    file.open(QFile::ReadOnly);
+    std::string testJson = file.readAll().toStdString();
+
+    QBENCHMARK {
+        JsonDocument doc = JsonDocument::fromJson(testJson);
+        doc.object();
+    }
+}
+
+void BenchmarkJson::createBinaryMessageQt()
+{
+    // Example: send information over a datastream to another process
+    // Measure performance of creating and processing data into bytearray
+    QBENCHMARK {
+        QJsonObject ob;
+        ob.insert(QStringLiteral("command"), 1);
+        ob.insert(QStringLiteral("key"), "some information");
+        ob.insert(QStringLiteral("env"), "some environment variables");
+        QJsonDocument(ob).toBinaryData();
+    }
+}
+
+void BenchmarkJson::createBinaryMessageStd()
+{
+    // Example: send information over a datastream to another process
+    // Measure performance of creating and processing data into bytearray
+    QBENCHMARK {
+        JsonObject ob;
+        ob.insert("command", 1);
+        ob.insert("key", "some information");
+        ob.insert("env", "some environment variables");
+        JsonDocument(ob).toBinaryData();
+    }
+}
+
+void BenchmarkJson::readBinaryMessageQt()
+{
+    // Example: receive information over a datastream from another process
+    // Measure performance of converting content back to QVariantMap
+    // We need to recreate the bytearray but here we only want to measure the latter
+    QJsonObject ob;
+    ob.insert(QStringLiteral("command"), 1);
+    ob.insert(QStringLiteral("key"), "some information");
+    ob.insert(QStringLiteral("env"), "some environment variables");
+    QByteArray msg = QJsonDocument(ob).toBinaryData();
+
+    QBENCHMARK {
+        QJsonDocument::fromBinaryData(msg, QJsonDocument::Validate).object();
+    }
+}
+
+void BenchmarkJson::readBinaryMessageStd()
+{
+    // Example: receive information over a datastream from another process
+    // Measure performance of converting content back to QVariantMap
+    // We need to recreate the bytearray but here we only want to measure the latter
+    JsonObject ob;
+    ob.insert("command", 1);
+    ob.insert("key", "some information");
+    ob.insert("env", "some environment variables");
+    std::string msg = JsonDocument(ob).toBinaryData();
+
+    QBENCHMARK {
+        JsonDocument::fromBinaryData(msg, JsonDocument::Validate).object();
+    }
+}
+
+void BenchmarkJson::createTextMessageQt()
+{
+    // Example: send information over a datastream to another process
+    // Measure performance of creating and processing data into bytearray
+    QBENCHMARK {
+        QJsonObject ob;
+        ob.insert(QStringLiteral("command"), 1);
+        ob.insert(QStringLiteral("key"), "some information");
+        ob.insert(QStringLiteral("env"), "some environment variables");
+        QByteArray msg = QJsonDocument(ob).toJson();
+    }
+}
+
+void BenchmarkJson::createTextMessageStd()
+{
+    // Example: send information over a datastream to another process
+    // Measure performance of creating and processing data into bytearray
+    QBENCHMARK {
+        JsonObject ob;
+        ob.insert("command", 1);
+        ob.insert("key", "some information");
+        ob.insert("env", "some environment variables");
+        std::string msg = JsonDocument(ob).toJson();
+    }
+}
+
+void BenchmarkJson::readTextMessageQt()
+{
+    // Example: receive information over a datastream from another process
+    // Measure performance of converting content back to QVariantMap
+    // We need to recreate the bytearray but here we only want to measure the latter
+    QJsonObject ob;
+    ob.insert(QStringLiteral("command"), 1);
+    ob.insert(QStringLiteral("key"), "some information");
+    ob.insert(QStringLiteral("env"), "some environment variables");
+    QByteArray msg = QJsonDocument(ob).toJson();
+
+    QBENCHMARK {
+        QJsonDocument::fromJson(msg).object();
+    }
+}
+
+void BenchmarkJson::readTextMessageStd()
+{
+    // Example: receive information over a datastream from another process
+    // Measure performance of converting content back to QVariantMap
+    // We need to recreate the bytearray but here we only want to measure the latter
+    JsonObject ob;
+    ob.insert("command", 1);
+    ob.insert("key", "some information");
+    ob.insert("env", "some environment variables");
+    std::string msg = JsonDocument(ob).toJson();
+
+    QBENCHMARK {
+        JsonDocument::fromJson(msg).object();
+    }
+}
+
+void BenchmarkJson::jsonObjectInsertQt()
+{
+    QJsonObject object;
+    QJsonValue value(1.5);
+
+    QBENCHMARK {
+        for (int i = 0; i < 1000; i++)
+            object.insert("testkey_" + QString::number(i), value);
+    }
+}
+
+void BenchmarkJson::jsonObjectInsertStd()
+{
+    JsonObject object;
+    JsonValue value(1.5);
+
+    QBENCHMARK {
+        for (int i = 0; i < 1000; i++)
+            object.insert("testkey_" + std::to_string(i), value);
+    }
+}
+
+QTEST_MAIN(BenchmarkJson)
+
+#include "tst_bench_json.moc"
+