tame/tamer
Mike Gerwitz be81878dd7 tamer: src::asg: Scaffolding for metasyntactic variables
Also known as metavariables or template parameters.

This is a bit of a tortured excursion, trying to figure out how I want to
best represent this.  I have a number of pages of hand-written notes that
I'd like to distill over time, but the rendered graph ontology (via
`asg-ontviz`) demonstrates the broad idea.

`AirTpl::TplApply` highlights some remaining questions.  What I had _wanted_
to do is to separate the concepts of application and expansion, and support
partial application and such.  But it's going to be too much work for now,
when it isn't needed---partial application can be worked around by simply
creating new templates and duplicating params, as we do today, although that
sucks and is a maintenance issue.  But I'd rather address that head-on in
the future.

So it's looking like Option B is going to be the approach for now, with
templates being closed (as in, no free metavariables) and expanded at the
same time.  This simplifies the parser and error conditions significantly
and makes it easier to utilize anonymous templates, since it'll still be the
active context.

My intent is to get at least the graph construction sorted out---not the
actual expansion and binding yet---enough that I can use templates to
represent parts of NIR that do not have proper graph representations or
desugaring yet, so that I can spit them back out again in the `xmli` file
and incrementally handle them.  That was an option I had considered some
months ago, but didn't want to entertain it at the time because I wasn't
sure what doing so would look like; while it was an attractive approach
since it pushes existing primitives into the template system (something I've
wanted to do for years), I didn't want to potentially tank performance or
compromise the design for it after I had spent so much effort on all of this
so far.

But my efforts have yielded a system that significantly exceeds my initial
performance expectations, with a decent abstractions, and so this seems
viable.

DEV-13708
2023-03-15 16:40:07 -04:00
..
benches Copyright year and name update 2023-01-20 23:37:30 -05:00
build-aux tamer: {tools=>build-aux}/asg-ontviz 2023-03-10 15:13:30 -05:00
src tamer: src::asg: Scaffolding for metasyntactic variables 2023-03-15 16:40:07 -04:00
tests tamer: NIR->xmli: Ceil, Floor expressions 2023-03-10 14:28:00 -05:00
.gitignore tamer: configure.ac: conf.sh: New configuration file 2023-03-10 14:27:57 -05:00
Cargo.lock tamer: Remove graphml target 2023-01-26 14:45:17 -05:00
Cargo.toml tamer: bin/tamec: wip-asg-derive-xmli-gated xmli output 2023-03-10 14:27:57 -05:00
Makefile.am tamer: {tools=>build-aux}/asg-ontviz 2023-03-10 15:13:30 -05:00
README.md Copyright year and name update 2023-01-20 23:37:30 -05:00
autogen.sh Copyright year and name update 2023-01-20 23:37:30 -05:00
bootstrap Copyright year and name update 2023-01-20 23:37:30 -05:00
conf.sh.in tamer: asg::graph::object::xir: Initial rate element reconstruction 2023-03-10 14:27:58 -05:00
configure.ac tamer: Embed ASG ontology visualization in rustdoc-generated docs 2023-03-10 14:28:00 -05:00
rustfmt.toml tamer/rustfmt (max_width): Set to 80 2019-11-27 09:15:15 -05:00

README.md

TAME in Rust (TAMER)

TAME was written to help tame the complexity of developing comparative insurance rating systems. This project aims to tame the complexity and performance issues of TAME itself. TAMER is therefore more tame than TAME.

TAME was originally written in XSLT. For more information about the project, see the parent README.md.

Building

To bootstrap from the source repository, run ./bootstrap.

To configure the build for your system, run ./configure. To build, run make. To run tests, run make check.

You may also invoke cargo directly, which make will do for you using options provided to configure.

Note that the default development build results in terrible runtime performance! See [#Build Flags][] below for instructions on how to generate a release binary.

Build Flags

The environment variable CARGO_BUILD_FLAGS can be used to provide additional arguments to cargo build when invoked via make. This can be provided optionally during configure and can be overridden when invoking make. For example:

# release build
$ ./configure && make CARGO_BUILD_FLAGS=--release
$ ./configure CARGO_BUILD_FLAGS=--release && make

# dev build
$ ./configure && make
$ ./configure CARGO_BUILD_FLAGS=--release && make CARGO_BUILD_FLAGS=

Hacking

This section contains advice for those developing TAMER.

Running Tests

Developers should be using test-driven development (TDD). make check will run all necessary tests.

Code Format

Rust provides rustfmt that can automatically format code for you. This project mandates its use and therefore eliminates personal preference in code style (for better or worse).

Formatting checks are run during make check and, on failure, will output the diff that would be applied if you ran make fmt (or make fix); this will run cargo fmt for you (and will use the binaries configured via configure).

Since developers should be doing test-driven development (TDD) and therefore should be running make check frequently, the hope is that frequent feedback on formatting issues will allow developers to quickly adjust their habits to avoid triggering formatting errors at all.

If you want to automatically fix formatting errors and then run tests:

$ make fmt check

Benchmarking

Benchmarks serve two purposes: external integration tests (which are subject to module visibility constraints) and actual benchmarking. To run benchmarks, invoke make bench.

Note that link-time optimizations (LTO) are performed on the binary for benchmarking so that its performance reflects release builds that will be used in production.

The configure script will automatically detect whether the test feature is unstable (as it was as of the time of writing) and, if so, will automatically fall back to invoking nightly (by running cargo +nightly bench).

If you do not have nightly, run you install it via rustup install nightly.