OpenEuphoria

Re: json

• Posted by CoJaBo2 Aug 06, 2012
• 2525 views

You'd probably want to use the map type to represent the JSON Objects (call them Objects, not some other term).

The actual representation would look something like this:

json=deserialize({ 
    "an_object": { 
        "an_array": [ 
            104,101,108,108,111 
        ], 
        "a_string": "hello", 
        "an_array_of_objects": [ 
            {},{},{} 
        ] 
    }, 
    "a_boolean": false, 
    "a_null": null}) 
--json={JSON_OBJECT,1} (1 simply being a map ID) 
 
an_object=get(json[2],"an_object") 
--object={JSON_OBJECT,2} (2 being another map ID) 
 
array=get(an_object[2],"an_array") 
--array={JSON_ARRAY,{{JSON_NUMBER,104},{JSON_NUMBER,101},{JSON_NUMBER,108},{JSON_NUMBER,108},{JSON_NUMBER,111}}} 
 
string=get(an_object[2],"a_string") 
--string={JSON_STRING,{104,101,108,108,111}} (or "hello") 
 
obj_array=get(an_object[2],"an_array_of_objects") 
--obj_array={JSON_ARRAY,{{JSON_OBJECT,3},{JSON_OBJECT,4},{JSON_OBJECT,5}}} 
 
boolean=get(json[2],"a_boolean") 
--boolean={JSON_BOOLEAN,0} (could probably define TRUE and FALSE constants if the std libs don't already) 
 
null=get(json[2],"a_null") 
--null={JSON_NULL,0} (keeping the "value" param for consistency, even though it is redundant) 
 

As you can see, this allows us to guarantee certain structural conditions-

• Every JSON value (Object, Array, String, Number, Boolean, Null) is represented as a 2-element sequence in the format {TYPE, VALUE}.
• Every Object is a Eu map with 0 or more string keys, each of which has a value that is a valid JSON value.
• Every Array is a Eu sequence of 0 or more valid JSON values.

An API could be layered on top of this to hide this typing complexity and simplify accessing things for the programmer; I have an idea for such an API, but don't have time to properly describe it right now.