Incorrect json.bnf grammar

[jovanpop-msft]

Current example for JSON grammar generates number and strings which are not valid JSON text. Only object or array can be the root JSON object. Probably correct syntax would be:

<JSON>      ::= <object> | <array>
<array>     ::= "[" <value> {"," <value>} "]"
<object>    ::= "{" <property> {"," <property>} "}"
<property>  ::= <string> ":" <value>
<value>     ::= <object> | <array> | <boolean> | <string> | <number>
<boolean>   ::= true | false
<string>    ::= """ <alphas> """
<alphas>    ::= <alpha> [<alphas>]
<number>    ::= <digit> [<number>]
<alpha>     ::= a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
<digit>     ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

[codelion]

Actually that is not true, if you check the rfc7159 you will see that it is not necessary for the JSON text to be only array or object.

[jovanpop-msft]

Hi, rfc7159 describes JSON format, i.e. the elements that can be in JSON. Could you take a look at https://tools.ietf.org/html/rfc4627 that is referenced from rfc7159, that describes JSON grammar. Look at the following section:

2. JSON Grammar

   A JSON text is a sequence of tokens. The set of tokens includes six structural characters, strings, numbers, and three literal names. A JSON text is a serialized object or array.

   JSON-text = object / array

Also, on http://json.org/ you can find definition:

JSON is built on two structures:

• A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.
• An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence.

Any JavaScript/Ajax call would expect JSON response as array/object. I agree that this might be unclear, so maybe you can create separate file with grammar above so people can choose the one they need.

[codelion]

I am aware of the previous RFC, here is the relevant portion from rfc7159.

Note that certain previous specifications of JSON constrained a JSON text to be an object or an Implementations that generate only objects or arrays where a JSON text is called for will be interoperable in the sense that all implementations will accept these as conforming JSON texts.

That said, I am happy to add your grammar in since it may be more appropriate for the JS/Ajax call responses. Can you create a PR and add it to https://github.com/codelion/gramtest/tree/master/src/test/resources folder?