Changes between Initial Version and Version 1 of JSONLua

Timestamp:

2010-03-04 17:09:54 (15 years ago)

Author:

javier_guerra

Comment:

--

JSONLua

@@ +1 @@
+
+== json.lua ==
+
+Simply copied from [http://json.luaforge.net/ JSON4Lua].  This is only the JSON encoding/decoding part, the JSON-RPC client depend on the (missing) !LuaSocket HTTP module.
+
+'''`string json.encode( lua_object )`'''[[BR]]
+Returns the Lua object JSON encoded into a string.
+Example:
+{{{
+json = require("json")
+print (json.encode( { 1, 2, 'fred', {first='mars',second='venus',third='earth'} } ))
+}}}
+prints
+{{{
+
+[1,2,"fred", {"first":"mars","second":"venus","third","earth"}]
+}}}
+
+'''`lua_object json.decode( json_string )`'''[[BR]]
+Decodes the JSON encoded data structure, and returns a Lua object with the appropriate data.
+Example:
+{{{
+json = require("json")
+testString = [[ { "one":1 , "two":2, "primes":[2,3,5,7] } ]]
+o = json.decode(testString)
+for k,v in pairs (o) do
+    print (k,v)
+end
+print ("Primes are:")
+for i,v in ipairs (o.primes) do
+    print (i,v)
+end
+}}}
+prints:
+{{{
+one             1
+two             2
+primes          table: 0032B928
+Primes are:
+1               2
+2               3
+3               5
+4               7
+}}}
+
+'''`json.null`'''[[BR]]
+A unique value that will be encoded as a null in a JSON encoding.
+
+This is necessary in one situation. In Lua, if a key in a table has a `nil` value, the key is simply discarded (since any non-existent key has a `nil` value). The encoding of arrays has been built to manage this `nil`-values in arrays, but associative arrays provide a problem. Consider:
+{{{
+t = { user="test", password=nil }
+}}}
+Since Lua simply discards the password key, JSON4Lua encodes this as the JSON string
+{{{
+{"user":"test"}
+}}}
+If, for some reason, your JSON RPC Server requires a defined `null` value, use the following code:
+{{{
+t = { user="test", password=json.null }
+}}}
+This will now correctly encode to:
+{{{
+{"user":"test","password":null}
+}}}
+Incidentally, `json.null` is simply a function that returns itself, so that you can use either `json.null` or `json.null()` as you fancy.
+
+'''Note''': A JSON `null` value is decoded as Lua `nil`, not as `json.null`.