Re: Simple Lua-only JSON decoder

[Dirk Laurie <dirk.laurie@...>]

I2017-04-17 16:22 GMT+02:00 Soni L. <fakedme@gmail.com>:
>
>
> On 2017-04-17 03:47 AM, Dirk Laurie wrote:
>>
>> My primitive JSON decoder, which operates by lexically translating
>> a JSON code to a Lua table literal, now does three things:
>>
>> 1. Unicode codepoints translated, e.g. from \u00e9 to \u{00e9}.
>> 2. List delimiters translated from […] to {…}.
>> 3. Keys translated e.g. from "item": to ["item"]=.
>>
>> local function json_decode (s)
>>    s = s:gsub("\\u(%d%d%d%d)","\\u{%1}")
>>    local function do_json_list(s,is_list)
>>      if is_list then s = s:sub(2,-2) end
>>      s = s:gsub("(%b[])()",do_json_list)
>>      if is_list then s = '{' .. s ..'}' end
>>      return s
>>    end
>>    local t = load('return '..do_json_list(s):gsub('("[%w_-]-"):','[%1]='))
>>    if t then return t() else return s end
>> end
>>
>> Please show me some sample JSON code that this decoder can't handle
>> properly.
>>
>> I already know about:
>>    1. Integer overflow. (Thanks, Sean!) --> won't happen
>>    2. JSON null is not Lua nil. --> define a suitable global called 'null'
>>
>
> I don't think { "\":": {} } works... Haven't tested it tho.

It also defeats rapidjson, so at least I am in good company :-)