package ppx_catch

  1. Overview
  2. Docs
A PPX rewriter to catch exceptions and wrap into options or results

Install

Dune Dependency

Authors

Maintainers

Sources

0.1.tar.gz
md5=6301b2275bed2f5a7044626000445999
sha512=01efa7eba79053149b6ed424bab10900fbb45f2ffa529229019a425d16610ca839da899d1109e59338d3fd1ba7a28446f214d1e98c7c3c065ba03e6534784356

Description

This package catches all exceptions in a block and returns an option or a result of the resulting value

Published: 05 Aug 2022

README

ppx_catch

ppx_catch is a PPX rewriter to catch exceptions. It acts as a catch-all and transforms expressions into options or results.

Usage

catch.o

The catch.o extension wraps an expression into an option.

[%catch.o
  let i = Option.get None in
  i + 1
]

gives None, while

[%catch.o
  let i = Option.get (Some 2)
  in i + 1
]

gives Some 3. [%catch.o expression] behaves exactly like:

try Some expression with _ -> None

catch.r

The catch.r extension wraps an expression into a result.

[%catch.r Some 10;
  let i = Option.get None in
  i + 1
]

gives Error (Some 10), while

[%catch.r Some 10;
  let i = Option.get (Some 2)
  in i + 1
]

gives Ok 3. [%catch.r err; expression] behaves exactly like:

try Ok expression with _ -> err

Dependencies (3)

  1. ppxlib >= "0.27.0"
  2. dune >= "2.7"
  3. alcotest >= "1.6.0"

Dev Dependencies (1)

  1. odoc with-doc

Used by

None

Conflicts

None

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