Changelog:
---
A lot has been going on, with more than 530 patches and 70 PRs merged since
0.7.0 last summer. In summary:
- Quite a lot of syntax improvements and changes. Checkout the latest
[cheat-sheet](https://catalalang.github.io/catala/syntax.pdf) for an overview
- Allow local `let ... equals ... in ...` definitions
- Better error messages and positions throughout
- Added the ability to directly call a scope and retrieve its outputs, like a
function
- Added disambiguation, allowing to access structure fields without specifying
the structure type each time
- Added automated resolution of operators, allowing e.g. to write just `+` in
place of all the type-specific operators `+.`, `+$`, `+@`, `+^`, etc.
- More consistent priority for operators. It is no longer allowed to write `a
and b or c` without parenthesis.
- Added and changed some operators (`date + duration` now allowed either way,
`int / int` now returns a decimal, added `duration / duration`)
- Added the ability to have variables and functions defined at
top-level (outside of any scope). See annex A of the tutorial for details.
- Added support for functions with multiple arguments
- Some big refactors in the compiler, allowing much better code sharing between
the different passes, and making it much easier to extend. Also added the
possibility to run the type-checker earlier, etc.
- Countless bug-fixes
- Improvements to our proof backend with Z3
- A tool to automatically synchronise with the upstream French law from
Legifrance
* Use the newer "pyproject.toml" for syntax highlighters
* Use venv for everything (previously, the pygment lexers were installed
globally, but more recent Python releases frown upon that. This will probably
be more stable in the long run...)
* Use one venv at the root of the project (`_python_venv/`) for both
pygments and the runtime
* Initialise this venv automatically from the Makefile (it should no longer be
necessary to run scattered `set_up.sh` scripts with mysterious interactions)
On the downsides, though:
* Only tested with Python 3.11 at the moment
* Need to remember to activate the venv (`. _python_venv/bin/activate`) from the
root for e.g. HTML literate output to work. A more manageable solution could
be for Catala to provide the lexers on-the-fly when calling `pygmentize`.
Closes#373
This forbids expressions such as `a and b or c`, avoiding the need to set an
implicit priority between `and`, `or` and `xor`, which I find error-prone.
Instead, when that appears, a message asking for explicit parentheses will be
shown to the user.
Implementation note: since that would be extremely tedious to do in the parser
directly, the parser is set to allow right-associativity without discrimination
for the logical operators, and the check is done during desugaring. This
required to explicit parentheses in the surface AST to discriminate the case
where the priority was explicit.
Command used: `sed -i 's/\([-+*/><=]=\?\)[.$@^€$]/\1/g' **/*/*.catala_*`
The overload test, of course, is kept unchanged and ensures that explicit
operators still work.
