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greg 2018-11-09 01:51:25 -08:00
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# Schala - a programming language meta-interpreter
Schala is a Rust framework written to make it easy to
create and experiment with toy programming languages. It provides
a common REPL, and a trait `ProgrammingLanguage` with provisions
for tokenizing text, parsing tokens, evaluating an abstract syntax tree,
and other tasks that are common to all programming languages.
Schala is a Rust framework written to make it easy to create and experiment
with toy programming languages. It provides a cross-language REPL and
provisions for tokenizing text, parsing tokens, evaluating an abstract syntax
tree, and other tasks that are common to all programming languages.
Schala is implemented as a Rust library `schala_lib`, which provides a
`schala_main` function. This function serves as the main loop of the REPL, if run
interactively, or otherwise reads and interprets programming language source
files. It expects as input a vector of `PLIGenerator`, which is a type representing
a closure that returns a boxed trait object that implements the `ProgrammingLanguage` trait,
and stores any persistent state relevant to that programming language. The ability
to share state between different programming languages is in the works.
Schala is implemented as a Rust library `schala-repl`, which provides a
function `repl_main` meant to be used as the equivalent of main() for library
users. This function parses command-line arguments and either runs an interactive
REPL or interprets a program non-interactively.
## About
Individual programming language implementations are Rust types that implement
the `ProgrammingLanguageInterface` trait and store whatever persistent state is
relevant to that language. The ability to share state between different
programming languages is in the works.
## History
Schala started out life as an experiment in writing a Javascript-like
programming language that would never encounter any kind of runtime value
@ -60,6 +60,7 @@ of learning how to write a programming language.
https://skillsmatter.com/skillscasts/10868-inside-the-rust-compiler
https://www.youtube.com/watch?v=il3gD7XMdmA
http://dev.stephendiehl.com/fun/006_hindley_milner.html
https://rust-lang-nursery.github.io/rustc-guide/type-inference.html
### Evaluation
*Understanding Computation*, Tom Stuart, O'Reilly 2013
@ -77,4 +78,5 @@ http://blog.ulysse.io/2016/07/03/llvm-getting-started.html
###Rust resources
https://thefullsnack.com/en/rust-for-the-web.html
https://rocket.rs/guide/getting-started/