Previously, to get the globally available declarations in a document
(including declarations from headers), we would have to recursively
walk the #include tree and get the declarations of each included
document.
To improve upon this, we now store a HashTable of globally available
declaration from included header files in each document, and populate
it when we first process the document.
Before this, invoking simple autocomplete actions in code documents
that had a very large #include tree (e.g when <LibGUI/Widget.h> was
included) hang the CppLanguageServer process and used 100% CPU until
the process ran out of memory.
Now, the autocomplete request in that situation returns immediately :^)
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
This makes them available for use by other language servers.
Also as a bonus, update the Shell language server to discover some
symbols and add go-to-definition functionality :^)
The C++ LanguageServer can now find the matching declaration for
variable names, function calls, struct/class types and properties.
When clicking on one of the above with Ctrl pressed, HackStudio will
ask the language server to find a matching declaration, and navigate
to the result in the Editor. :^)
We now also look at the available declarations from included header
files when autocompleting names.
Additionally, you can now request autocomplete on an empty token, which
brings up all available names, starting from the inner-most scope.
... and performs preprocessing on the source code before parsing.
To support this, we are now able to keep track of multiple
files in the autocomplete engine. We re-parse a file whenever it is
edited.
