Add conanfile.py to support builds with Conan

The build recipe uses the qtbase's 'bin/qt-configure-module' script
directly which is recommended when building other Qt modules ouside
the qtbase's -prefix.

The recipe uses functionality from qt-conan-common Conan
package via 'python_requires'.

This recipe sets it's own Conan options that match with the
module configure options.

The recipe sets it's version number based on QT_REPO_MODULE_VERSION
and QT_REPO_MODULE_PRERELEASE_VERSION_SEGMENT in .cmake.conf file.

The dependency to qtbase, qtsvg and qtshadertools is declared
using semantic versioning so that it will pick the latest
available prerelease or final version of the major.minor.patch.

Task-number: QTBUG-94384
Change-Id: I1f12434521d11f63c31a102bfbfaf923cb262965
Reviewed-by: Toni Saario <toni.saario@qt.io>
(cherry picked from commit d6ea619ac87a5ff9ed239b34a4c43a7e6fa141a0)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

2 files changed, 128 insertions, 0 deletions

diff --git a/.cmake.conf b/.cmake.conf
index 4e73b3d607..4aa8eb1fde 100644
--- a/.cmake.conf
+++ b/.cmake.conf
@@ -1 +1,2 @@
 set(QT_REPO_MODULE_VERSION "6.2.0")
+set(QT_REPO_MODULE_PRERELEASE_VERSION_SEGMENT "alpha1")
diff --git a/conanfile.py b/conanfile.py
new file mode 100644
index 0000000000..2a698d3b72
--- /dev/null
+++ b/conanfile.py
@@ -0,0 +1,127 @@
+#############################################################################
+##
+## Copyright (C) 2021 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of the release tools 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.
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+from conans import ConanFile
+import os
+import re
+from functools import lru_cache
+from pathlib import Path
+
+
+_qtdeclarative_features = [
+    "qml-animation",
+    "qml-debug",
+    "qml-delegate-model",
+    "qml-devtools",
+    "qml-itemmodel",
+    "qml-jit",
+    "qml-list-model",
+    "qml-locale",
+    "qml-network",
+    "qml-object-model",
+    "qml-preview",
+    "qml-profiler",
+    "qml-sequence-object",
+    "qml-table-model",
+    "qml-worker-script",
+    "qml-xml-http-request",
+    "qml-xmllistmodel",
+    "quick-animatedimage",
+    "quick-canvas",
+    "quick-designer",
+    "quick-draganddrop",
+    "quick-flipable",
+    "quick-gridview",
+    "quick-listview",
+    "quick-particles",
+    "quick-path",
+    "quick-pathview",
+    "quick-positioners",
+    "quick-repeater",
+    "quick-shadereffect",
+    "quick-sprite",
+    "quick-tableview",
+]
+
+
+@lru_cache(maxsize=8)
+def _parse_qt_version_by_key(key: str) -> str:
+    with open(Path(Path(__file__).parent.resolve() / ".cmake.conf")) as f:
+        ret = [m.group(1) for m in [re.search(r"{0} .*\"(.*)\"".format(key), f.read())] if m]
+    return ret.pop() if ret else ""
+
+
+class QtDeclarative(ConanFile):
+    name = "qtdeclarative"
+    license = "LGPL-3.0-only, Commercial Qt License Agreement"
+    author = "The Qt Company <https://www.qt.io/contact-us>"
+    url = "https://code.qt.io/cgit/qt/qtdeclarative.git/"
+    description = (
+        "The Qt Declarative module provides a declarative framework for building highly dynamic, "
+        "custom user interfaces"
+    )
+    topics = ("qt", "qt6", "qtdeclarative")
+    settings = "os", "compiler", "arch", "build_type"
+    exports = ".cmake.conf"  # for referencing the version number and prerelease tag
+    exports_sources = "*", "!conan*.*"
+    # use commit ID as the RREV (recipe revision) if this is exported from .git repository
+    revision_mode = "scm" if Path(Path(__file__).parent.resolve() / ".git").exists() else "hash"
+    python_requires = f"qt-conan-common/{_parse_qt_version_by_key('QT_REPO_MODULE_VERSION')[0:3]}@qt/everywhere"
+
+    options = {item.replace("-", "_"): ["yes", "no", None] for item in _qtdeclarative_features}
+    default_options = {item.replace("-", "_"): None for item in _qtdeclarative_features}
+
+    def set_version(self):
+        _ver = _parse_qt_version_by_key("QT_REPO_MODULE_VERSION")
+        _prerelease = _parse_qt_version_by_key("QT_REPO_MODULE_PRERELEASE_VERSION_SEGMENT")
+        self.version = _ver + "-" + _prerelease if _prerelease else _ver
+
+    def requirements(self):
+        _version = _parse_qt_version_by_key("QT_REPO_MODULE_VERSION")
+        # will match latest prerelase of final major.minor.patch
+        self.requires(f"qtbase/[<={_version}, include_prerelease=True]@{self.user}/{self.channel}")
+        self.requires(f"qtsvg/[<={_version}, include_prerelease=True]@{self.user}/{self.channel}")
+        self.requires(f"qtshadertools/[<={_version}, include_prerelease=True]@{self.user}/{self.channel}")
+
+    def build(self):
+        self.python_requires["qt-conan-common"].module.build_leaf_qt_module(self)
+
+    def package(self):
+        cmd = ["cmake", "--install", "."]
+        self.run(" ".join(cmd), run_environment=True)
+
+    def package_info(self):
+        self.python_requires["qt-conan-common"].module.package_info(self)
+
+    def package_id(self):
+        self.info.requires.package_revision_mode()
+
+    def deploy(self):
+        self.copy("*")  # copy from current package
+        if not os.environ.get("QT_CONAN_INSTALL_SKIP_DEPS"):
+            self.copy_deps("*")  # copy from dependencies