Module Mlt_parser

Code for parsing toplevel expect test files

type chunk = {
part : string option;

The part the chunk is in, None if it's not in any part.

phrases : Ppxlib.toplevel_phrase list;
expectation : Expect_test_matcher.Fmt.t Expect_test_matcher.Cst.t Expect_test_common.Expectation.t;
phrases_loc : Ppxlib.Location.t;
}
val split_chunks : fname:string -> allow_output_patterns:bool -> Ppxlib.toplevel_phrase list -> chunk list * (Ppxlib.toplevel_phrase list * Ppxlib.position * string option) option

Recursively parses toplevel phrases (i.e., contiguous units of code separated by ;;) into "chunks", one chunk per %%expect statement.

For example if the mlt contents are:

 let x = 1 + 1;;

 printf "%d" x + 2;;

 [%%expect {|
- : int: 4
|}];;

 print_string "f" ^ "o" ^ "o";;

 [%%expect {|
- : string: "foo"
|}];;

 print_string 3 + 3 + 3;;

then you'd have two chunks, where the first has two phrases ("x = 1 + 1" and "printf "%d" x + 2") and an expectation.body of ": int 4". The second chunk would have just the one phrase.

"print_line 3 + 3 + 3" is not part of a chunk because there is no expectation following it, so instead it is returned as trailing_code, which is just a list of toplevel phrases with some position metadata.

"part" refers to @@@part "foo" statements, which are arbitrary section breaks. Each chunk, and the trailing code, belongs to a part (which is just the empty string "" if none has been specified).

type mlt_block =
| Org of string
| Expect of string
| Code of string
val sexp_of_mlt_block : mlt_block -> Ppx_sexp_conv_lib.Sexp.t
val mlt_block_of_sexp : Ppx_sexp_conv_lib.Sexp.t -> mlt_block
val parse : Ppxlib.toplevel_phrase list -> contents:string -> mlt_block list

Takes a list of toplevel phrases and the raw string they're embedded in and returns a list of labeled blocks, so that for instance the following raw toplevel code:

[%%org {|
  Here comes a very /simple/ example.
|}];;

1 + 1;;
[%%expect {|
- : int: 2
|}];;

is parsed into its constituent parts:

[
  (Org "Here comes a very /simple/ example.");
  (Code "1 + 1");
  (Expect "- : int: 2")
]

Note that we only care about these three kinds of element (org blocks, expect blocks, and regular OCaml code blocks); everything else -- including toplevel comments -- is silently discarded.