OCaml library for JSONfeed parsing and creation
switch error types
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README.md
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README.md
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example/feed_parser.ml
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example/feed_parser.ml
···
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Format.printf "✓ Round-trip successful: feeds are equal\n"
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else
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Format.printf "✗ Round-trip failed: feeds differ\n"
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| Error (`Msg err) ->
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| Error err ->
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Format.eprintf "✗ Round-trip failed: %s\n" err)
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| Error (`Msg err) ->
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| Error err ->
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Format.eprintf "Error parsing feed: %s\n" err
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with
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| Sys_error msg ->
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example/feed_validator.ml
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example/feed_validator.ml
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(match Jsonfeed.of_string invalid_json1 with
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| Ok _ -> Format.printf "✗ Should have failed (missing version)\n"
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| Error (`Msg err) ->
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| Error err ->
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Format.printf "✓ Correctly rejected invalid feed: %s\n" err);
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(* Missing required title field *)
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(match Jsonfeed.of_string invalid_json2 with
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| Ok _ -> Format.printf "✗ Should have failed (missing title)\n"
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Format.printf "✓ Correctly rejected invalid feed: %s\n" err);
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(* Item without id *)
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(match Jsonfeed.of_string invalid_json3 with
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| Ok _ -> Format.printf "✗ Should have failed (item without id)\n"
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Format.printf "✓ Correctly rejected invalid feed: %s\n" err);
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Format.printf "\n"
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lib/jsonfeed.ml
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lib/jsonfeed.ml
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(* JSON parsing and serialization *)
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type error = [ `Msg of string ]
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type error = string
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let error_msgf fmt = Format.kasprintf (fun s -> Error (`Msg s)) fmt
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let error_msgf fmt = Format.kasprintf (fun s -> Error s) fmt
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(* JSON parsing helpers *)
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···
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(* JSON serialization *)
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let to_jsonm enc feed =
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(* Simplified serialization using Jsonm *)
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let enc_field name value_fn =
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ignore (Jsonm.encode enc (`Lexeme (`Name name)));
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value_fn ()
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lib/jsonfeed.mli
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lib/jsonfeed.mli
···
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type-safe parsing and serialization of JSON Feed documents. JSON Feed is a
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syndication format similar to RSS and Atom, but using JSON instead of XML.
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{b Key Features:}
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- Type-safe construction with compile-time validation
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- Support for all JSON Feed 1.1 fields
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- RFC 3339 date parsing with Ptime integration
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- Streaming parsing and serialization with Jsonm
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- Comprehensive documentation and examples
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{b Quick Start:}
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{[
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(* Create a simple feed *)
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(* Parse from string *)
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match Jsonfeed.of_string json with
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| Ok feed -> Printf.printf "Feed: %s\n" (Jsonfeed.title feed)
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| Error (`Msg err) -> Printf.eprintf "Error: %s\n" err
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| Error err -> Printf.eprintf "Error: %s\n" err
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]}
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@see <https://www.jsonfeed.org/version/1.1/> JSON Feed Specification *)
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(** {1 Parsing and Serialization} *)
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(** Error type for parsing operations. *)
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type error = [ `Msg of string ]
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type error = string
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(** [of_jsonm decoder] parses a JSON Feed from a Jsonm decoder.
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···
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with streaming JSON processing pipelines.
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@param decoder A Jsonm decoder positioned at the start of a JSON Feed document
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@return [Ok feed] on success, [Error (`Msg err)] on parse error
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@return [Ok feed] on success, [Error err] on parse error
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{b Example:}
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{[
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let decoder = Jsonm.decoder (`String json_string) in
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match Jsonfeed.of_jsonm decoder with
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| Ok feed -> (* process feed *)
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| Error (`Msg err) -> (* handle error *)
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| Error err -> (* handle error *)
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]} *)
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val of_jsonm : Jsonm.decoder -> (t, [> error]) result
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val of_jsonm : Jsonm.decoder -> (t, error) result
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(** [to_jsonm encoder feed] serializes a JSON Feed to a Jsonm encoder.
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···
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(** [of_string s] parses a JSON Feed from a string.
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@param s A JSON string containing a JSON Feed document
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@return [Ok feed] on success, [Error (`Msg err)] on parse error
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@return [Ok feed] on success, [Error err] on parse error
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{b Example:}
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{[
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}|} in
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match Jsonfeed.of_string json with
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| Ok feed -> Printf.printf "Parsed: %s\n" (Jsonfeed.title feed)
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| Error (`Msg err) -> Printf.eprintf "Error: %s\n" err
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| Error err -> Printf.eprintf "Error: %s\n" err
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]} *)
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val of_string : string -> (t, [> error]) result
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val of_string : string -> (t, error) result
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(** [to_string ?minify feed] serializes a JSON Feed to a string.
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test/test_jsonfeed.ml
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test/test_jsonfeed.ml
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| Ok feed ->
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Alcotest.(check string) "title" "Test Feed" (Jsonfeed.title feed);
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Alcotest.(check int) "items" 0 (List.length (Jsonfeed.items feed))
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Alcotest.fail (Printf.sprintf "Parse failed: %s" err)
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let test_feed_parse_with_item () =
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Alcotest.(check string) "item id" "https://example.com/1" (Item.id item);
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Alcotest.(check (option string)) "content_html" (Some "<p>Hello</p>") (Item.content_html item)
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| _ -> Alcotest.fail "Expected 1 item")
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Alcotest.fail (Printf.sprintf "Parse failed: %s" err)
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let test_feed_roundtrip () =
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Alcotest.(check int) "items count"
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(List.length (Jsonfeed.items feed1))
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(List.length (Jsonfeed.items feed2))
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Alcotest.fail (Printf.sprintf "Round-trip failed: %s" err)
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let test_feed_parse_invalid_missing_content () =
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}|} in
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match Jsonfeed.of_string json with
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| Ok _ -> Alcotest.fail "Should reject item without content"
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| Error (`Msg err) ->
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| Error err ->
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Alcotest.(check bool) "has error" true
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(contains_substring err "content")
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