From da284ef10e0ef80776b9fc9b7bb0e6dc8d71ba63 Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@qt.io>
Date: Mon, 17 Dec 2018 15:09:23 +0100
Subject: Add support for machine-readable JSON output to the MOC

The --output-json parameter will make moc produce a .json file next to
the regular output file. With --collect-json the .json files for a
module can be merged into a single one.

Task-number: QTBUG-68796
Change-Id: I0e8fb802d47bd22da219701a8df947973d4bd7b5
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
---
 src/tools/moc/collectjson.cpp | 103 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 src/tools/moc/collectjson.cpp

(limited to 'src/tools/moc/collectjson.cpp')

diff --git a/src/tools/moc/collectjson.cpp b/src/tools/moc/collectjson.cpp
new file mode 100644
index 0000000000..4029bca5e9
--- /dev/null
+++ b/src/tools/moc/collectjson.cpp
@@ -0,0 +1,103 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <qfile.h>
+#include <qjsonarray.h>
+#include <qjsondocument.h>
+#include <qjsonobject.h>
+#include <qhashfunctions.h>
+#include <qstringlist.h>
+#include <cstdlib>
+
+static bool readFromDevice(QIODevice *device, QJsonArray *allMetaObjects)
+{
+    const QByteArray contents = device->readAll();
+    if (contents.isEmpty())
+        return true;
+
+    QJsonParseError error {};
+    QJsonDocument metaObjects = QJsonDocument::fromJson(contents, &error);
+    if (error.error != QJsonParseError::NoError) {
+        fprintf(stderr, "%s at %d\n", error.errorString().toUtf8().constData(), error.offset);
+        return false;
+    }
+
+    allMetaObjects->append(metaObjects.object());
+    return true;
+}
+
+int collectJson(const QStringList &jsonFiles, const QString &outputFile)
+{
+    qSetGlobalQHashSeed(0);
+
+    QFile output;
+    if (outputFile.isEmpty()) {
+        if (!output.open(stdout, QIODevice::WriteOnly)) {
+            fprintf(stderr, "Error opening stdout for writing\n");
+            return EXIT_FAILURE;
+        }
+    } else {
+        output.setFileName(outputFile);
+        if (!output.open(QIODevice::WriteOnly)) {
+            fprintf(stderr, "Error opening %s for writing\n", qPrintable(outputFile));
+            return EXIT_FAILURE;
+        }
+    }
+
+    QJsonArray allMetaObjects;
+    if (jsonFiles.isEmpty()) {
+        QFile f;
+        if (!f.open(stdin, QIODevice::ReadOnly)) {
+            fprintf(stderr, "Error opening stdin for reading\n");
+            return EXIT_FAILURE;
+        }
+
+        if (!readFromDevice(&f, &allMetaObjects)) {
+            fprintf(stderr, "Error parsing data from stdin\n");
+            return EXIT_FAILURE;
+        }
+    }
+
+    for (const QString &jsonFile: jsonFiles) {
+        QFile f(jsonFile);
+        if (!f.open(QIODevice::ReadOnly)) {
+            fprintf(stderr, "Error opening %s for reading\n", qPrintable(jsonFile));
+            return EXIT_FAILURE;
+        }
+
+        if (!readFromDevice(&f, &allMetaObjects)) {
+            fprintf(stderr, "Error parsing %s\n", qPrintable(jsonFile));
+            return EXIT_FAILURE;
+        }
+    }
+
+    QJsonDocument doc(allMetaObjects);
+    output.write(doc.toJson());
+
+    return EXIT_SUCCESS;
+}
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