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_sources/index.rst.txt

@@ -1,38 +1,207 @@
+****
 json
-====
+****
+
+.. current-library:: json
+.. current-module:: json
 
-.. current-library: json
-   
 .. toctree::
    :maxdepth: 2
    :hidden:
 
-   reference
+This library provides essential functionality for working with JSON data.  JSON
+(JavaScript Object Notation) is a lightweight data interchange format that is easy for
+humans to read and write, and easy for machines to parse and generate.
+
+
+The json Module
+===============
+
+Constants
+---------
+
+.. constant:: $null
+
+   When parsing, JSON's "null" is converted to this value and when printing this value is
+   printed as "null".
+
+
+Conditions
+----------
+
+.. class:: <json-error>
+   :open:
+   :instantiable:
+
+   All JSON errors are subclasses of this class.
+
+   :superclasses: :class:`<format-string-condition>` :drm:`<error>`
+
+.. class:: <json-parse-error>
+   :instantiable:
+
+   Any error signalled during parsing (except for file system errors) will be an instance
+   of this class.
+
+   :superclasses: :class:`<json-error>`
+
+
+Parsing
+-------
+
+.. generic-function:: parse-json
+   :open:
+
+   Parse JSON formatted text from the given *source*.  This is the
+   main user-visible entry point for parsing.  *table-class*, if
+   provided, should be a subclass of :class:`<table>` to use when
+   creating a json "object".
+
+   :signature: parse-json (source, #key strict?, table-class) => (json)
+   :parameter source: An :drm:`<object>`.
+   :parameter #key strict?: An instance of :drm:`<boolean>`.
+   :parameter #key table-class: Default to :class:`<string-table>`.
+   :value json: A JSON :drm:`<object>`
+
+   :discussion:
+
+      The parse is strict by default. If ``strict?:`` :drm:`#f` is
+      used then:
+
+      - `#` is allowed as a comment character
+
+      - ``\<c>`` is equivalent to ``<c>``, where ``<c>`` is not a defined
+        escape character.
+
+      - Trailing commas are allowed in arrays and objects.
+
+.. method:: parse-json
+   :specializer: <string>
+
+   Parse a JSON object from a :drm:`<string>`.
+
+   :signature: parse-json (source, #key strict?, table-class) => (json)
+   :parameter source: An instance of :drm:`<string>`
+   :parameter #key strict?: An instance of :drm:`<boolean>`. The default is :drm:`#t`.
+   :parameter #key table-class: A subclass of :class:`<table>`.
+   :value json: An instance of :drm:`<object>`.
+
+   :example:
+
+      .. code-block:: dylan
+
+        let data = """{"a": 1, "b": 2,}""";
+        let parsed = parse-json(data, strict?: #f);
+	let a = parsed["a"];
+
+      `Run this example <https://play.opendylan.org/shared/89037b0be1300a55>`_
+      in https://play.opendylan.org
+
+      Note the use of ``strict?: #f`` is needed since *data* has a
+      trailing comma after the number 2.
+
+.. method:: parse-json
+   :specializer: <stream>
+
+   Parse a JSON object from a :class:`<stream>`.
+
+   :signature: parse-json (source, #key strict?, table-class) => (json)
+   :parameter source: An instance of :class:`<stream>`.
+   :parameter #key strict?: An instance of :drm:`<boolean>`. The default is :drm:`#f`.
+   :parameter #key table-class: A subclass of :class:`<table>`.
+   :value json: An instance of :drm:`<object>`.
+
+   :example:
+
+      .. code-block:: dylan
+
+        with-open-file (fs = "data.json")
+	  let data = parse-json(fs, strict?: #f);
+	  ...
+	end;
+
+      `Run an example
+      <https://play.opendylan.org/shared/24c4ac32aaf6a5b5>`_ with a
+      string stream in https://play.opendylan.org
+
+
+Printing
+--------
+
+.. function:: print-json
+
+   Print an object in JSON format.
+
+   :signature: print-json (object, stream, #key indent, sort-keys?) => ()
+   :parameter object: The object to print. An instance of :drm:`<object>`.
+   :parameter stream: Stream on wich to do output. An instance of :class:`<stream>`.
+   :parameter #key indent: :drm:`#f` or an instance of :drm:`<integer>`.
+   :parameter #key sort-keys?: An instance of :drm:`<boolean>`.
+
+   :discussion:
+
+      If ``indent`` is false, *object* is printed with minimal whitespace. If ``indent``
+      is an integer, then pretty printing is used, with *indent* spaces for each indent
+      level.
+
+      If ``sort-keys?`` is true, output object keys in lexicographical
+      order.
+
+      This function does some initial setup and then calls :gf:`do-print-json` to print
+      ``object``.  :gf:`do-print-json` has methods for most built-in Dylan types.
+
+.. generic-function:: do-print-json
+   :open:
+
+   :signature: do-print-json (object, stream) => ()
+   :parameter object: An instance of :drm:`<object>`.
+   :parameter stream: An instance of :class:`<stream>`.
+
+   :description:
+
+      This method may be overridden for your own classes in order to print them in JSON
+      format. Often the simplest way to implement your method will be to convert your
+      object to a :drm:`<table>` and then pass it to :func:`print-json` to print it on
+      *stream*.
+
+      It is also possible to write JSON syntax directly to *stream*.  If `indent:` was
+      passed to *print* then *stream* will be a pretty printing stream and the `pprint
+      module <https://opendylan.org/library-reference/io/print.html#the-pprint-module>`_
+      in the IO library may be used to implement pretty printing.
+
+.. method:: do-print-json
+   :specializer: == $null
+
+   Prints "null" on the output stream.
+
+.. method:: do-print-json
+   :specializer: <integer>
+
+   Prints an :drm:`<integer>` on the output stream.
+
+.. method:: do-print-json
+   :specializer: <float>
+
+   Prints a :drm:`<float>` on the output stream.
+
+.. method:: do-print-json
+   :specializer: <boolean>
 
-This library provides essential functionality for working with JSON
-data. JSON (JavaScript Object Notation) is a lightweight data
-interchange format that is easy for humans to read and write, and easy
-for machines to parse and generate.
+   Prints a :drm:`<boolean>` on the output stream as "true" or "false".
 
-The json library offers two primary methods to facilitate the
-conversion between JSON strings and Dylan data structures, making it
-straightforward to integrate JSON data handling into your Open Dylan
-applications. This methods are:
+.. method:: do-print-json
+   :specializer: <string>
 
-:gf:`parse-json`
-    This method takes a JSON-formatted string and converts it into an
-    Open Dylan table. This function is useful when you need to process
-    JSON data received from external sources, such as web APIs or
-    configuration files.
+   Prints a :drm:`<string>` on the output stream as a JSON compatible
+   string. Specifically, this method limits the escape codes to those recognized by the
+   JSON format and converts non-printable characters to Unicode escape sequences.
 
-:gf:`print-json`
-    The ``print-json`` function takes an Open Dylan table and converts
-    it into a formatted JSON string. This is useful for serializing
-    Open Dylan data structures into JSON format for storage,
-    transmission, or display purposes.
+.. method:: do-print-json
+   :specializer: <collection>
 
+   Prints a :drm:`<collection>` on the output stream as a JSON array.
 
-Indices and tables
-==================
+.. method:: do-print-json
+   :specializer: <table>
 
-* :ref:`genindex`
+   Prints a :drm:`<table>` on the output stream as a JSON "object".