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%D \module
%D [ file=m-json,
%D version=2022.04.11, % 2012.08.03,
%D title=\CONTEXT\ Modules,
%D subtitle=Json,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
%D This module is a side effect of looking into json. Currently there are
%D only a few helpers:
%D
%D \starttyping
%D moduledata.json.tolua (str)
%D moduledata.json.tostring(val)
%D \stoptyping
%D
%D Nothing spectacular but maybe handy to have around.
\startmodule [json]
% check for: utilities.json
\registerctxluafile{util-jsn}{}
% \def\u#1#2#3#4{\cldcontext{utf.char(0x#1#2#3#4)}}
\startluacode
-- when we are at the lua end we can just use the table directly but
-- otherwise we can use accessors at the tex end and if needed some
-- special formatters
--
-- we can actually map the json to xml and then use xml accessors
-- which has some benefits
local tonumber = tonumber
local context = context
local gmatch = string.gmatch
local loaded = { }
local current = nil
local json = utilities.json
local function loadjsonfile(namespace,filename)
local data = loaded[namespace]
if not data then
local fullname = resolvers.findfile(filename)
if fullname and fullname ~= "" then
data = io.loaddata(fullname)
if data then
data = utilities.json.tolua(data)
end
end
if not data then
data = { }
end
loaded[namespace] = data
metapost.setparameterset(namespace,data)
end
current = data
return data
end
local function jsonfield(namespace,name,default)
local data = loaded[namespace] or current
if current then
for s in gmatch(name,"[^%.]+") do
data = data[s] or data[tonumber(s) or 0]
if not data then
return
end
end
return data
end
end
json.field = jsonfield
function json.loaded(namespace)
return (namespace and loaded[namespace]) or current or { }
end
interfaces.implement {
name = "loadjsonfile",
actions = loadjsonfile,
arguments = { "optional", "optional" },
public = true,
protected = true,
}
interfaces.implement {
name = "jsonfield",
actions = { jsonfield, context },
arguments = "2 arguments",
public = true,
}
interfaces.implement {
name = "jsonfielddefault",
actions = { jsonfield, context },
arguments = "3 arguments",
public = true,
}
\stopluacode
\stopmodule
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