This replaces the C++ GenerateWindowOrWorkerInterfaces generator with a
python3 port.
The generator uses the new python WebIDL parser and writes directly to a
TextIO instance instead of porting SourceGenerator.
For validation, the python generator was diffed against the existing C++
generator over the full LibWeb IDL input set. The generated output is
behaviorally identical, and the only changes are whitespace changes
(all improvements).
To do this we parse the grammar supplied in `ValueTypes.json` and
generate the appropriate parsing function in `CSS::Parser::Parser`
Only a small subset of the CSS grammar (i.e. types `<foo>` and
alternatives `<foo> | <bar>`) is implemented so far, it will be
expanded in later commits.
In the future we should switch to using a better file format for this,
i.e. one that supports directly pasting CSS grammar production blocks
(https://drafts.csswg.org/css-values-4/#css-grammar-production-block)
and has support for inline comments, but we use JSON for now for
simplicity's sake.
We don't match the C++ output byte-for-byte here, because the key
iteration order is different. So I've taken the opportunity to tidy up
some whitespace too.
The idea is that scripts directly under Meta are meant to be run by
people. Scripts that are only imported or run by other scripts are
moved to a subdirectory.
This replaces the C++ IPC compiler and generator with a python3 port.
For validation, the parser is nearly a line-for-line port of the C++
parser. This patch includes lexer.py, which is a simple port of our
GenericLexer, as the mechanics actually felt pretty nice in python as
well.
The code generator does not include a port of our SourceGenerator, as
that felt less nice. Instead, we write directly to a TextIO instance.
The generated output is almost byte-for-byte identical with our C++
generator, with trivial whitespace differences:
* The C++ generator included extraneous newlines before and after all
switch statements, which is not kept here.
* The C++ generator did not include newlines between message handling
functions, which we now do.
* The C++ generator had some extraneous spaces at the end of some lines,
and incorrect tabbing (3 spaces) at the beginning of some lines.
