shiboken6/Documentation: Replace XPath/Xquery usage for retrieving WebXML docs by a parser

shiboken used XPath expressions to extract the function descriptions
from the qdoc-generated WebXML. With the deprecation of QtXmlPatterns
in Qt 6, libxml/xslt was used for this. A major drawback is that
libxml/xslt is unable to match entities in attributes which means
functions taking parameters by const-ref could not be found. This
required cumbersome workarounds involving repeated searches, which
still were not sufficient to find all functions.

To fix this, write a WebXML parser based on QXmlStreamReader
that extracts the contents of a WebXML page into some simple
data structures and use those for searching.

On this occasion, also use the metafunction flags to correctly
match binary operator functions.

This reduces the number of functions for which no documentation
can be found (from ~1100 to ~800 for the qtbase repository).
From the remaining functions, ~230 are functions inherited from
templates, which should at least be listed. Others are caused
by qdoc not finding hidden friends.

The remaining usages of libxml/xslt are the doxygen parser and the
documentation modifications using XSLT.

Task-number: PYSIDE-1106
Change-Id: I31c045ad42948afad884f40d5bbc8bee7555859e
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>

1 files changed, 5 insertions, 5 deletions

diff --git a/sources/shiboken6/ApiExtractor/messages.h b/sources/shiboken6/ApiExtractor/messages.h
index b66221792..def68f514 100644
--- a/sources/shiboken6/ApiExtractor/messages.h
+++ b/sources/shiboken6/ApiExtractor/messages.h
@@ -167,24 +167,24 @@ QString msgUsingMemberClassNotFound(const AbstractMetaClass *c,
 
 QString msgCannotFindDocumentation(const QString &fileName,
                                    const char *what, const QString &name,
-                                   const QString &query);
+                                   const QString &query = {});
 
 QString msgFallbackForDocumentation(const QString &fileName,
                                     const char *what, const QString &name,
-                                    const QString &query);
+                                    const QString &query = {});
 
 QString msgCannotFindDocumentation(const QString &fileName,
                                    const AbstractMetaFunction *function,
-                                   const QString &query);
+                                   const QString &query = {});
 
 QString msgFallbackForDocumentation(const QString &fileName,
                                     const AbstractMetaFunction *function,
-                                    const QString &query);
+                                    const QString &query = {});
 
 QString msgCannotFindDocumentation(const QString &fileName,
                                    const AbstractMetaClass *metaClass,
                                    const AbstractMetaEnum &e,
-                                   const QString &query);
+                                   const QString &query = {});
 
 QString msgCannotFindDocumentation(const QString &fileName,
                                    const AbstractMetaClass *metaClass,