{"id":18013052,"url":"https://github.com/sim642/ppx_viewpattern","last_synced_at":"2025-03-26T16:31:48.746Z","repository":{"id":60130557,"uuid":"464257216","full_name":"sim642/ppx_viewpattern","owner":"sim642","description":"View patterns in OCaml","archived":false,"fork":false,"pushed_at":"2025-03-15T10:31:51.000Z","size":54,"stargazers_count":11,"open_issues_count":1,"forks_count":1,"subscribers_count":3,"default_branch":"master","last_synced_at":"2025-03-15T11:19:59.345Z","etag":null,"topics":["ocaml","ppx","ppx-rewriter","ppxlib"],"latest_commit_sha":null,"homepage":"","language":"OCaml","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/sim642.png","metadata":{"files":{"readme":"README.md","changelog":"CHANGELOG.md","contributing":null,"funding":null,"license":"LICENSE.md","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2022-02-27T21:24:40.000Z","updated_at":"2025-03-15T10:19:20.000Z","dependencies_parsed_at":"2022-09-25T23:30:27.035Z","dependency_job_id":null,"html_url":"https://github.com/sim642/ppx_viewpattern","commit_stats":null,"previous_names":[],"tags_count":1,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/sim642%2Fppx_viewpattern","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/sim642%2Fppx_viewpattern/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/sim642%2Fppx_viewpattern/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/sim642%2Fppx_viewpattern/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/sim642","download_url":"https://codeload.github.com/sim642/ppx_viewpattern/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":245692720,"owners_count":20656994,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["ocaml","ppx","ppx-rewriter","ppxlib"],"created_at":"2024-10-30T03:19:44.828Z","updated_at":"2025-03-26T16:31:48.369Z","avatar_url":"https://github.com/sim642.png","language":"OCaml","funding_links":[],"categories":[],"sub_categories":[],"readme":"# ppx_viewpattern\n\n[![ci workflow status](https://github.com/sim642/ppx_viewpattern/actions/workflows/ci.yml/badge.svg)](https://github.com/sim642/ppx_viewpattern/actions/workflows/ci.yml)\n[![GitHub release status](https://img.shields.io/github/v/release/sim642/ppx_viewpattern)](https://github.com/sim642/ppx_viewpattern/releases)\n[![opam package status](https://badgen.net/opam/v/ppx_viewpattern)](https://opam.ocaml.org/packages/ppx_viewpattern)\n\nTransformation for view patterns in OCaml.\n_Attempts to_ imitate [Haskell view patterns](https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/view_patterns.html).\n\n\n## Installation\n```console\nopam install ppx_viewpattern\n```\n\n## Usage\nIn dune:\n```\n(preprocess (pps ppx_viewpattern))\n```\n\n## Syntax\nUse `[%view? pat when exp]` as a pattern to apply `exp` to whatever the pattern is matching and match the result of the `exp` application against `pat`.\nAnalogous to the Haskell view pattern `exp -\u003e pat`.\n\nSee [`example/`](example/) for example usage.\n\nSupported in:\n* `match ... with ...` cases,\n* `function ...` cases,\n* `fun ... -\u003e ...` arguments,\n* `let ... in ...` expression binding left-hand sides,\n* `try ... with ...` cases,\n* nested inside the `pat` and `exp` parts of a view pattern itself.\n\n### Caveats\nA view pattern disables `redundant-case` and `partial-match` warnings for the corresponding `match`/`function`.\n\nCurrently unsupported in:\n- `let ...` definition left-hand sides (at top level or in modules).\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsim642%2Fppx_viewpattern","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsim642%2Fppx_viewpattern","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsim642%2Fppx_viewpattern/lists"}