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379 lines
8.7 KiB
379 lines
8.7 KiB
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local type = type;
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local t_insert, t_concat, t_remove, t_sort = table.insert, table.concat, table.remove, table.sort;
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local s_char = string.char;
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local tostring, tonumber = tostring, tonumber;
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local pairs, ipairs = pairs, ipairs;
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local next = next;
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local error = error;
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local newproxy, getmetatable = newproxy, getmetatable;
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local print = print;
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--module("json")
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local json = {};
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local null = newproxy and newproxy(true) or {};
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if getmetatable and getmetatable(null) then
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getmetatable(null).__tostring = function() return "null"; end;
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end
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json.null = null;
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local escapes = {
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["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b",
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["\f"] = "\\f", ["\n"] = "\\n", ["\r"] = "\\r", ["\t"] = "\\t"};
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local unescapes = {
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["\""] = "\"", ["\\"] = "\\", ["/"] = "/",
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b = "\b", f = "\f", n = "\n", r = "\r", t = "\t"};
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for i=0,31 do
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local ch = s_char(i);
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if not escapes[ch] then escapes[ch] = ("\\u%.4X"):format(i); end
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end
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local valid_types = {
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number = true,
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string = true,
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table = true,
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boolean = true
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};
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local special_keys = {
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__array = true;
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__hash = true;
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};
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local simplesave, tablesave, arraysave, stringsave;
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function stringsave(o, buffer)
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-- FIXME do proper utf-8 and binary data detection
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t_insert(buffer, "\""..(o:gsub(".", escapes)).."\"");
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end
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function arraysave(o, buffer)
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t_insert(buffer, "[");
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if next(o) then
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for i,v in ipairs(o) do
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simplesave(v, buffer);
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t_insert(buffer, ",");
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end
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t_remove(buffer);
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end
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t_insert(buffer, "]");
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end
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function tablesave(o, buffer)
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local __array = {};
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local __hash = {};
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local hash = {};
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for i,v in ipairs(o) do
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__array[i] = v;
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end
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for k,v in pairs(o) do
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local ktype, vtype = type(k), type(v);
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if valid_types[vtype] or v == null then
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if ktype == "string" and not special_keys[k] then
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hash[k] = v;
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elseif (valid_types[ktype] or k == null) and __array[k] == nil then
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__hash[k] = v;
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end
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end
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end
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if next(__hash) ~= nil or next(hash) ~= nil or next(__array) == nil then
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t_insert(buffer, "{");
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local mark = #buffer;
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if buffer.ordered then
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local keys = {};
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for k in pairs(hash) do
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t_insert(keys, k);
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end
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t_sort(keys);
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for _,k in ipairs(keys) do
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stringsave(k, buffer);
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t_insert(buffer, ":");
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simplesave(hash[k], buffer);
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t_insert(buffer, ",");
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end
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else
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for k,v in pairs(hash) do
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stringsave(k, buffer);
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t_insert(buffer, ":");
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simplesave(v, buffer);
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t_insert(buffer, ",");
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end
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end
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if next(__hash) ~= nil then
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t_insert(buffer, "\"__hash\":[");
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for k,v in pairs(__hash) do
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simplesave(k, buffer);
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t_insert(buffer, ",");
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simplesave(v, buffer);
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t_insert(buffer, ",");
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end
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t_remove(buffer);
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t_insert(buffer, "]");
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t_insert(buffer, ",");
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end
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if next(__array) then
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t_insert(buffer, "\"__array\":");
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arraysave(__array, buffer);
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t_insert(buffer, ",");
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end
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if mark ~= #buffer then t_remove(buffer); end
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t_insert(buffer, "}");
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else
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arraysave(__array, buffer);
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end
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end
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function simplesave(o, buffer)
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local t = type(o);
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if t == "number" then
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t_insert(buffer, tostring(o));
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elseif t == "string" then
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stringsave(o, buffer);
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elseif t == "table" then
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tablesave(o, buffer);
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elseif t == "boolean" then
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t_insert(buffer, (o and "true" or "false"));
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else
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t_insert(buffer, "null");
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end
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end
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function json.encode(obj)
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local t = {};
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simplesave(obj, t);
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return t_concat(t);
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end
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function json.encode_ordered(obj)
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local t = { ordered = true };
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simplesave(obj, t);
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return t_concat(t);
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end
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-----------------------------------
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function json.decode(json)
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json = json.." "; -- appending a space ensures valid json wouldn't touch EOF
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local pos = 1;
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local current = {};
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local stack = {};
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local ch, peek;
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local function next()
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ch = json:sub(pos, pos);
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if ch == "" then error("Unexpected EOF"); end
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pos = pos+1;
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peek = json:sub(pos, pos);
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return ch;
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end
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local function skipwhitespace()
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while ch and (ch == "\r" or ch == "\n" or ch == "\t" or ch == " ") do
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next();
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end
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end
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local function skiplinecomment()
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repeat next(); until not(ch) or ch == "\r" or ch == "\n";
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skipwhitespace();
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end
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local function skipstarcomment()
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next(); next(); -- skip '/', '*'
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while peek and ch ~= "*" and peek ~= "/" do next(); end
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if not peek then error("eof in star comment") end
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next(); next(); -- skip '*', '/'
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skipwhitespace();
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end
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local function skipstuff()
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while true do
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skipwhitespace();
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if ch == "/" and peek == "*" then
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skipstarcomment();
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elseif ch == "/" and peek == "/" then
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skiplinecomment();
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else
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return;
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end
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end
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end
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local readvalue;
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local function readarray()
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local t = {};
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next(); -- skip '['
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skipstuff();
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if ch == "]" then next(); return t; end
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t_insert(t, readvalue());
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while true do
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skipstuff();
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if ch == "]" then next(); return t; end
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if not ch then error("eof while reading array");
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elseif ch == "," then next();
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elseif ch then error("unexpected character in array, comma expected"); end
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if not ch then error("eof while reading array"); end
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t_insert(t, readvalue());
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end
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end
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local function checkandskip(c)
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local x = ch or "eof";
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if x ~= c then error("unexpected "..x..", '"..c.."' expected"); end
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next();
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end
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local function readliteral(lit, val)
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for c in lit:gmatch(".") do
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checkandskip(c);
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end
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return val;
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end
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local function readstring()
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local s = "";
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checkandskip("\"");
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while ch do
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while ch and ch ~= "\\" and ch ~= "\"" do
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s = s..ch; next();
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end
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if ch == "\\" then
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next();
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if unescapes[ch] then
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s = s..unescapes[ch];
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next();
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elseif ch == "u" then
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local seq = "";
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for i=1,4 do
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next();
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if not ch then error("unexpected eof in string"); end
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if not ch:match("[0-9a-fA-F]") then error("invalid unicode escape sequence in string"); end
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seq = seq..ch;
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end
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s = s..s.char(tonumber(seq, 16)); -- FIXME do proper utf-8
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next();
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else error("invalid escape sequence in string"); end
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end
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if ch == "\"" then
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next();
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return s;
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end
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end
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error("eof while reading string");
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end
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local function readnumber()
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local s = "";
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if ch == "-" then
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s = s..ch; next();
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if not ch:match("[0-9]") then error("number format error"); end
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end
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if ch == "0" then
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s = s..ch; next();
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if ch:match("[0-9]") then error("number format error"); end
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else
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while ch and ch:match("[0-9]") do
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s = s..ch; next();
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end
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end
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if ch == "." then
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s = s..ch; next();
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if not ch:match("[0-9]") then error("number format error"); end
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while ch and ch:match("[0-9]") do
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s = s..ch; next();
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end
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if ch == "e" or ch == "E" then
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s = s..ch; next();
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if ch == "+" or ch == "-" then
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s = s..ch; next();
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if not ch:match("[0-9]") then error("number format error"); end
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while ch and ch:match("[0-9]") do
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s = s..ch; next();
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end
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end
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end
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end
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return tonumber(s);
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end
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local function readmember(t)
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skipstuff();
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local k = readstring();
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skipstuff();
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checkandskip(":");
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t[k] = readvalue();
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end
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local function fixobject(obj)
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local __array = obj.__array;
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if __array then
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obj.__array = nil;
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for i,v in ipairs(__array) do
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t_insert(obj, v);
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end
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end
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local __hash = obj.__hash;
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if __hash then
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obj.__hash = nil;
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local k;
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for i,v in ipairs(__hash) do
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if k ~= nil then
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obj[k] = v; k = nil;
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else
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k = v;
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end
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end
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end
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return obj;
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end
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local function readobject()
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local t = {};
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next(); -- skip '{'
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skipstuff();
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if ch == "}" then next(); return t; end
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if not ch then error("eof while reading object"); end
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readmember(t);
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while true do
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skipstuff();
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if ch == "}" then next(); return fixobject(t); end
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if not ch then error("eof while reading object");
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elseif ch == "," then next();
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elseif ch then error("unexpected character in object, comma expected"); end
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if not ch then error("eof while reading object"); end
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readmember(t);
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end
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end
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function readvalue()
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skipstuff();
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while ch do
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if ch == "{" then
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return readobject();
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elseif ch == "[" then
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return readarray();
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elseif ch == "\"" then
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return readstring();
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elseif ch:match("[%-0-9%.]") then
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return readnumber();
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elseif ch == "n" then
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return readliteral("null", null);
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elseif ch == "t" then
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return readliteral("true", true);
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elseif ch == "f" then
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return readliteral("false", false);
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else
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error("invalid character at value start: "..ch);
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end
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end
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error("eof while reading value");
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end
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next();
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return readvalue();
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end
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function json.test(object)
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local encoded = json.encode(object);
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local decoded = json.decode(encoded);
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local recoded = json.encode(decoded);
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if encoded ~= recoded then
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print("FAILED");
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print("encoded:", encoded);
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print("recoded:", recoded);
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else
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print(encoded);
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end
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return encoded == recoded;
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end
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return json;
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