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if not modules then modules = { } end modules ['util-jsn'] = {
version = 1.001,
comment = "companion to m-json.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- Of course we could make a nice complete parser with proper error messages but
-- as json is generated programmatically errors are systematic and we can assume
-- a correct stream. If not, we have some fatal error anyway. So, we can just rely
-- on strings being strings (apart from the unicode escape which is not in 5.1) and
-- as we first catch known types we just assume that anything else is a number.
local P, V, R, S, C, Cc, Cs, Ct, Cf, Cg = lpeg.P, lpeg.V, lpeg.R, lpeg.S, lpeg.C, lpeg.Cc, lpeg.Cs, lpeg.Ct, lpeg.Cf, lpeg.Cg
local lpegmatch = lpeg.match
local format = string.format
local utfchar = utf.char
local concat = table.concat
local tonumber, tostring, rawset, type = tonumber, tostring, rawset, type
local json = utilities.json or { }
utilities.json = json
-- moduledata = moduledata or { }
-- moduledata.json = json
-- \\ \/ \b \f \n \r \t \uHHHH
local lbrace = P("{")
local rbrace = P("}")
local lparent = P("[")
local rparent = P("]")
local comma = P(",")
local colon = P(":")
local dquote = P('"')
local whitespace = lpeg.patterns.whitespace
local optionalws = whitespace^0
local escape = C(P("\\u") / "0x" * S("09","AF","af")) / function(s) return utfchar(tonumber(s)) end
local jstring = dquote * Cs((escape + (1-dquote))^0) * dquote
local jtrue = P("true") * Cc(true)
local jfalse = P("false") * Cc(false)
local jnull = P("null") * Cc(nil)
local jnumber = (1-whitespace-rparent-rbrace-comma)^1 / tonumber
local key = jstring
local jsonconverter = { "value",
object = lbrace * Cf(Ct("") * V("pair") * (comma * V("pair"))^0,rawset) * rbrace,
pair = Cg(optionalws * key * optionalws * colon * V("value")),
array = Ct(lparent * V("value") * (comma * V("value"))^0 * rparent),
value = optionalws * (jstring + V("object") + V("array") + jtrue + jfalse + jnull + jnumber + #rparent) * optionalws,
}
-- local jsonconverter = { "value",
-- object = lbrace * Cf(Ct("") * V("pair") * (comma * V("pair"))^0,rawset) * rbrace,
-- pair = Cg(optionalws * V("string") * optionalws * colon * V("value")),
-- array = Ct(lparent * V("value") * (comma * V("value"))^0 * rparent),
-- string = jstring,
-- value = optionalws * (V("string") + V("object") + V("array") + jtrue + jfalse + jnull + jnumber) * optionalws,
-- }
-- lpeg.print(jsonconverter) -- size 181
function json.tolua(str)
return lpegmatch(jsonconverter,str)
end
local function tojson(value,t) -- we could optimize #t
local kind = type(value)
if kind == "table" then
local done = false
local size = #value
if size == 0 then
for k, v in next, value do
if done then
t[#t+1] = ","
else
t[#t+1] = "{"
done = true
end
t[#t+1] = format("%q:",k)
tojson(v,t)
end
if done then
t[#t+1] = "}"
else
t[#t+1] = "{}"
end
elseif size == 1 then
-- we can optimize for non tables
t[#t+1] = "["
tojson(value[1],t)
t[#t+1] = "]"
else
for i=1,size do
if done then
t[#t+1] = ","
else
t[#t+1] = "["
done = true
end
tojson(value[i],t)
end
t[#t+1] = "]"
end
elseif kind == "string" then
t[#t+1] = format("%q",value)
elseif kind == "number" then
t[#t+1] = value
elseif kind == "boolean" then
t[#t+1] = tostring(value)
end
return t
end
function json.tostring(value)
-- todo optimize for non table
local kind = type(value)
if kind == "table" then
return concat(tojson(value,{}),"")
elseif kind == "string" or kind == "number" then
return value
else
return tostring(value)
end
end
-- local tmp = [[ { "a" : true, "b" : [ 123 , 456E-10, { "a" : true, "b" : [ 123 , 456 ] } ] } ]]
-- tmp = json.tolua(tmp)
-- inspect(tmp)
-- tmp = json.tostring(tmp)
-- inspect(tmp)
-- tmp = json.tolua(tmp)
-- inspect(tmp)
-- tmp = json.tostring(tmp)
-- inspect(tmp)
-- inspect(json.tostring(true))
return json
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