qdoc: Store read-only attribute to index for C++ properties

The .index files were missing an attribute for C++ properties that
are read-only.

For a PropertyNode, if setWritable() was not explicitly called,
the read-only status was based on whether the property's access
functions included a getter method. When reading nodes from an index,
these access functions are not restored when constructing a
PropertyNode as that information is not needed anymore. A side-effect
of this was that all C++ property nodes read from index were
considered read-only.

QDoc also supports resolving the read-only status for a QML property
based on the associated C++ property of a class that the parent QML
type instantiates. If this instantiated class was read from index,
that meant that the read-only status was resolved incorrectly.

To fix, add writable="false" attribute for all read-only C++ properties
written to index, and explicitly call setWritable() when reading them
back in.

Pick-to: 6.5
Fixes: QTBUG-113015
Change-Id: Iaf8276a892d9a764fed9a67ebd005481c16bba17
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

2 files changed, 9 insertions, 4 deletions

diff --git a/src/qdoc/qdoc/qdocindexfiles.cpp b/src/qdoc/qdoc/qdocindexfiles.cpp
index e9bdda715..a5d49e4dc 100644
--- a/src/qdoc/qdoc/qdocindexfiles.cpp
+++ b/src/qdoc/qdoc/qdocindexfiles.cpp
@@ -402,6 +402,8 @@ void QDocIndexFiles::readIndexSection(QXmlStreamReader &reader, Node *current,
         if (attributes.value(QLatin1String("bindable")) == QLatin1String("true"))
             propNode->setPropertyType(PropertyNode::PropertyType::BindableProperty);
 
+        propNode->setWritable(attributes.value(QLatin1String("writable")) != QLatin1String("false"));
+
         if (!indexUrl.isEmpty())
             location = Location(indexUrl + QLatin1Char('/') + parent->name().toLower() + ".html");
         else if (!indexUrl.isNull())
@@ -1015,6 +1017,9 @@ bool QDocIndexFiles::generateIndexSection(QXmlStreamWriter &writer, Node *node,
         if (propertyNode->propertyType() == PropertyNode::PropertyType::BindableProperty)
             writer.writeAttribute("bindable", "true");
 
+        if (!propertyNode->isWritable())
+            writer.writeAttribute("writable", "false");
+
         if (!brief.isEmpty())
             writer.writeAttribute("brief", brief);
         // Property access function names
diff --git a/tests/auto/qdoc/generatedoutput/expected_output/properties/testcpp.index b/tests/auto/qdoc/generatedoutput/expected_output/properties/testcpp.index
index a06a13ae7..802a9b6d5 100644
--- a/tests/auto/qdoc/generatedoutput/expected_output/properties/testcpp.index
+++ b/tests/auto/qdoc/generatedoutput/expected_output/properties/testcpp.index
@@ -59,7 +59,7 @@
                 </function>
                 <function name="virtualFun" fullname="TestQDoc::Test::virtualFun" href="testqdoc-test.html#virtualFun" status="active" access="public" location="testcpp.h" documented="true" meta="plain" virtual="virtual" type="void" signature="void virtualFun()"/>
                 <typedef name="SomeType" fullname="TestQDoc::Test::SomeType" href="testqdoc-test.html#SomeType-typedef" status="active" access="public" location="testcpp.h" documented="true"/>
-                <property name="id" fullname="TestQDoc::Test::id" href="testqdoc-test.html#id-prop" status="active" access="public" location="testcpp.h" documented="true"/>
+                <property name="id" fullname="TestQDoc::Test::id" href="testqdoc-test.html#id-prop" status="active" access="public" location="testcpp.h" documented="true" writable="false"/>
             </class>
             <class name="TestDerived" fullname="TestQDoc::TestDerived" href="testqdoc-testderived.html" status="active" access="public" location="testcpp.h" since="2.0" documented="true" bases="TestQDoc::Test" module="TestCPP" brief="A derived class in a namespace">
                 <function name="bindableProp" fullname="TestQDoc::TestDerived::bindableProp" href="testqdoc-testderived.html#bindableProp-prop" status="active" access="public" location="testcpp.h" meta="plain" associated-property="bindableProp" type="QBindable&lt;QString&gt;" signature="QBindable&lt;QString&gt; bindableProp()"/>
@@ -94,13 +94,13 @@
                     <resetter name="resetBoolProp"/>
                     <notifier name="boolPropChanged"/>
                 </property>
-                <property name="intProp" fullname="TestQDoc::TestDerived::intProp" href="testqdoc-testderived.html#intProp-prop" status="active" access="public" location="testcpp.h" documented="true">
+                <property name="intProp" fullname="TestQDoc::TestDerived::intProp" href="testqdoc-testderived.html#intProp-prop" status="active" access="public" location="testcpp.h" documented="true" writable="false">
                     <getter name="getInt"/>
                 </property>
-                <property name="name" fullname="TestQDoc::TestDerived::name" href="testqdoc-testderived.html#name-prop" status="active" access="public" location="testcpp.h" documented="true" brief="This property holds a name">
+                <property name="name" fullname="TestQDoc::TestDerived::name" href="testqdoc-testderived.html#name-prop" status="active" access="public" location="testcpp.h" documented="true" writable="false" brief="This property holds a name">
                     <getter name="name"/>
                 </property>
-                <property name="someProp" fullname="TestQDoc::TestDerived::someProp" href="testqdoc-testderived.html#someProp-prop" status="active" access="public" location="testcpp.h" documented="true" bindable="true">
+                <property name="someProp" fullname="TestQDoc::TestDerived::someProp" href="testqdoc-testderived.html#someProp-prop" status="active" access="public" location="testcpp.h" documented="true" bindable="true" writable="false">
                     <getter name="someProp"/>
                 </property>
             </class>