Hi all. I am watching Principle of Programming Languages series on youtube. I would like to see how https://github.com/rescript-lang/syntax is implemented. But I am not able to figure out the starting point of the program where it takes a file and returns an AST.
I cloned this syntax repo. How can I run this example? https://github.com/rescript-lang/syntax#example-api-usage
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ryyppy
October 26, 2020, 8:13pm
2
Not sure what you mean exactly, but this is the starting point of the rescript parser CLI:
("-ppx", Arg.String (fun txt -> ppx := txt), "Apply a specific built-in ppx before parsing, none or jsx. Default: none");
(* ("-report", Arg.String (fun txt -> report := txt), "Stylize errors and messages using color and context. Accepts `Pretty` and `Plain`. Default `Plain`") *)
]
let parse () = Arg.parse spec addFilename usage
end
module CliArgProcessor = struct
type backend = Parser: ('diagnostics) Res_driver.parsingEngine -> backend [@@unboxed]
let processFile ~isInterface ~width ~recover ~origin ~target ~report:_ ~ppx filename =
try
let len = String.length filename in
let processInterface =
isInterface || len > 0 && (String.get [@doesNotRaise]) filename (len - 1) = 'i'
in
let parsingEngine =
match origin with
| "reasonBinary" -> Parser Res_driver_reason_binary.parsingEngine
| "ml" | "ocaml" -> Parser Res_driver_ml_parser.parsingEngine
| _ -> Parser Res_driver.parsingEngine
Here is the relevant entry in the Makefile:
The nice thing about rescript parser development is that you only need to install opam and the 4.06.1 switch, as stated in the README.
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