In my carelessness, I was re-using pointers when a fact was used twice!
This could cause disastrous consequences like a double close panic on a
datetime.now() fact for example.
In other news, we should consider if it's possible to get more clever
about graph shape optimization so that we don't need more than once
instance of certain functions like datetime.now() in our graph.
Most of the time, we don't need to have a dynamic call sub graph, since
the actual function call could be represented statically as it
originally was before lambda functions were implemented. Simplifying the
graph shape has important performance benefits in terms of both keep the
graph smaller (memory, etc) and in avoiding the need to run transactions
at runtime (speed) to reshape the graph.
Co-authored-by: Samuel Gélineau <gelisam@gmail.com>
I've been waiting to write this patch for a long time. I firmly believe
that the idea of "exported resources" was truly a brilliant one, but
which was never even properly understood by its original inventors! This
patch set aims to show how it should have been done.
The main differences are:
* Real-time modelling, since "once per run" makes no sense.
* Filter with code/functions not language syntax.
* Directed exporting to limit the intended recipients.
The next step is to add more "World" reading and filtering functions to
make it easy and expressive to make your selection of resources to
collect!
This adds a forkv statement which is used to iterate over a map with a
body of statements. This is an important data transformation tool which
should be used sparingly, but is important to have.
An import statement inside of a forkv loop is not currently supported.
We have a simple hack to detect the obvious cases, but more deeply
nested scenarios probably won't be caught, and you'll get an obscure
error message if you try to do this.
This was incredibly challenging to get right, and it's all thanks to Sam
for his brilliance.
Note, I couldn't think of a better keyword that "forkv" but suggestions
are welcome if you think you have a better idea. Other ideas were formap
and foreach, but neither got me very excited.
This adds a for statement which is used to iterate over a list with a
body of statements. This is an important data transformation tool which
should be used sparingly, but is important to have.
An import statement inside of a for loop is not currently supported. We
have a simple hack to detect the obvious cases, but more deeply nested
scenarios probably won't be caught, and you'll get an obscure error
message if you try to do this.
This was incredibly challenging to get right, and it's all thanks to Sam
for his brilliance.
Co-authored-by: Samuel Gélineau <gelisam@gmail.com>
Instead of constantly making these updates, let's just remove the year
since things are stored in git anyways, and this is not an actual modern
legal risk anymore.
If you had ambiguous code, and specified an invalid type, this could
sneak through and become a runtime error, instead of a compile-time
error. We fix this and add a test.
This adds a modern type unification algorithm, which drastically
improves performance, particularly for bigger programs.
This required a change to the AST to add TypeCheck methods (for Stmt)
and Infer/Check methods (for Expr). This also changed how the functions
express their invariants, and as a result this was changed as well.
This greatly improves the way we express these invariants, and as a
result it makes adding new polymorphic functions significantly easier.
This also makes error output for the user a lot better in pretty much
all scenarios.
The one downside of this patch is that a good chunk of it is merged in
this giant single commit since it was hard to do it step-wise. That's
not the end of the world.
This couldn't be done without the guidance of Sam who helped me in
explaining, debugging, and writing all the sneaky algorithmic parts and
much more. Thanks again Sam!
Co-authored-by: Samuel Gélineau <gelisam@gmail.com>
Plumb through the standard context.Context so that a function can be
cancelled if someone requests this. It makes it less awkward to write
simple functions that might depend on io or network access.
This is a helper function that can generate a bunch of functions from a
struct type. This is most useful when using a CLI args struct for
command line parsing and then storing the values as functions.
An alternative version of this might choose to return all of the values
as a single giant struct.
With the recent merging of embedded package imports and the entry CLI
package, it is now possible for users to build in mcl code into a single
binary. This additional permission makes it explicitly clear that this
is permitted to make it easier for those users. The condition is phrased
so that the terms can be "patched" by the original author if it's
necessary for the project. For example, if the name of the language
(mcl) changes, has a differently named new version, someone finds a
phrasing improvement or a legal loophole, or for some other
reasonable circumstance. Now go write some beautiful embedded tools!
