mirror of
https://github.com/bjc/prosody.git
synced 2025-04-03 21:27:38 +03:00
379 lines
8.7 KiB
Lua
379 lines
8.7 KiB
Lua
|
|
local type = type;
|
|
local t_insert, t_concat, t_remove, t_sort = table.insert, table.concat, table.remove, table.sort;
|
|
local s_char = string.char;
|
|
local tostring, tonumber = tostring, tonumber;
|
|
local pairs, ipairs = pairs, ipairs;
|
|
local next = next;
|
|
local error = error;
|
|
local newproxy, getmetatable = newproxy, getmetatable;
|
|
local print = print;
|
|
|
|
--module("json")
|
|
local json = {};
|
|
|
|
local null = newproxy and newproxy(true) or {};
|
|
if getmetatable and getmetatable(null) then
|
|
getmetatable(null).__tostring = function() return "null"; end;
|
|
end
|
|
json.null = null;
|
|
|
|
local escapes = {
|
|
["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b",
|
|
["\f"] = "\\f", ["\n"] = "\\n", ["\r"] = "\\r", ["\t"] = "\\t"};
|
|
local unescapes = {
|
|
["\""] = "\"", ["\\"] = "\\", ["/"] = "/",
|
|
b = "\b", f = "\f", n = "\n", r = "\r", t = "\t"};
|
|
for i=0,31 do
|
|
local ch = s_char(i);
|
|
if not escapes[ch] then escapes[ch] = ("\\u%.4X"):format(i); end
|
|
end
|
|
|
|
local valid_types = {
|
|
number = true,
|
|
string = true,
|
|
table = true,
|
|
boolean = true
|
|
};
|
|
local special_keys = {
|
|
__array = true;
|
|
__hash = true;
|
|
};
|
|
|
|
local simplesave, tablesave, arraysave, stringsave;
|
|
|
|
function stringsave(o, buffer)
|
|
-- FIXME do proper utf-8 and binary data detection
|
|
t_insert(buffer, "\""..(o:gsub(".", escapes)).."\"");
|
|
end
|
|
|
|
function arraysave(o, buffer)
|
|
t_insert(buffer, "[");
|
|
if next(o) then
|
|
for i,v in ipairs(o) do
|
|
simplesave(v, buffer);
|
|
t_insert(buffer, ",");
|
|
end
|
|
t_remove(buffer);
|
|
end
|
|
t_insert(buffer, "]");
|
|
end
|
|
|
|
function tablesave(o, buffer)
|
|
local __array = {};
|
|
local __hash = {};
|
|
local hash = {};
|
|
for i,v in ipairs(o) do
|
|
__array[i] = v;
|
|
end
|
|
for k,v in pairs(o) do
|
|
local ktype, vtype = type(k), type(v);
|
|
if valid_types[vtype] or v == null then
|
|
if ktype == "string" and not special_keys[k] then
|
|
hash[k] = v;
|
|
elseif (valid_types[ktype] or k == null) and __array[k] == nil then
|
|
__hash[k] = v;
|
|
end
|
|
end
|
|
end
|
|
if next(__hash) ~= nil or next(hash) ~= nil or next(__array) == nil then
|
|
t_insert(buffer, "{");
|
|
local mark = #buffer;
|
|
if buffer.ordered then
|
|
local keys = {};
|
|
for k in pairs(hash) do
|
|
t_insert(keys, k);
|
|
end
|
|
t_sort(keys);
|
|
for _,k in ipairs(keys) do
|
|
stringsave(k, buffer);
|
|
t_insert(buffer, ":");
|
|
simplesave(hash[k], buffer);
|
|
t_insert(buffer, ",");
|
|
end
|
|
else
|
|
for k,v in pairs(hash) do
|
|
stringsave(k, buffer);
|
|
t_insert(buffer, ":");
|
|
simplesave(v, buffer);
|
|
t_insert(buffer, ",");
|
|
end
|
|
end
|
|
if next(__hash) ~= nil then
|
|
t_insert(buffer, "\"__hash\":[");
|
|
for k,v in pairs(__hash) do
|
|
simplesave(k, buffer);
|
|
t_insert(buffer, ",");
|
|
simplesave(v, buffer);
|
|
t_insert(buffer, ",");
|
|
end
|
|
t_remove(buffer);
|
|
t_insert(buffer, "]");
|
|
t_insert(buffer, ",");
|
|
end
|
|
if next(__array) then
|
|
t_insert(buffer, "\"__array\":");
|
|
arraysave(__array, buffer);
|
|
t_insert(buffer, ",");
|
|
end
|
|
if mark ~= #buffer then t_remove(buffer); end
|
|
t_insert(buffer, "}");
|
|
else
|
|
arraysave(__array, buffer);
|
|
end
|
|
end
|
|
|
|
function simplesave(o, buffer)
|
|
local t = type(o);
|
|
if t == "number" then
|
|
t_insert(buffer, tostring(o));
|
|
elseif t == "string" then
|
|
stringsave(o, buffer);
|
|
elseif t == "table" then
|
|
tablesave(o, buffer);
|
|
elseif t == "boolean" then
|
|
t_insert(buffer, (o and "true" or "false"));
|
|
else
|
|
t_insert(buffer, "null");
|
|
end
|
|
end
|
|
|
|
function json.encode(obj)
|
|
local t = {};
|
|
simplesave(obj, t);
|
|
return t_concat(t);
|
|
end
|
|
function json.encode_ordered(obj)
|
|
local t = { ordered = true };
|
|
simplesave(obj, t);
|
|
return t_concat(t);
|
|
end
|
|
|
|
-----------------------------------
|
|
|
|
|
|
function json.decode(json)
|
|
json = json.." "; -- appending a space ensures valid json wouldn't touch EOF
|
|
local pos = 1;
|
|
local current = {};
|
|
local stack = {};
|
|
local ch, peek;
|
|
local function next()
|
|
ch = json:sub(pos, pos);
|
|
if ch == "" then error("Unexpected EOF"); end
|
|
pos = pos+1;
|
|
peek = json:sub(pos, pos);
|
|
return ch;
|
|
end
|
|
|
|
local function skipwhitespace()
|
|
while ch and (ch == "\r" or ch == "\n" or ch == "\t" or ch == " ") do
|
|
next();
|
|
end
|
|
end
|
|
local function skiplinecomment()
|
|
repeat next(); until not(ch) or ch == "\r" or ch == "\n";
|
|
skipwhitespace();
|
|
end
|
|
local function skipstarcomment()
|
|
next(); next(); -- skip '/', '*'
|
|
while peek and ch ~= "*" and peek ~= "/" do next(); end
|
|
if not peek then error("eof in star comment") end
|
|
next(); next(); -- skip '*', '/'
|
|
skipwhitespace();
|
|
end
|
|
local function skipstuff()
|
|
while true do
|
|
skipwhitespace();
|
|
if ch == "/" and peek == "*" then
|
|
skipstarcomment();
|
|
elseif ch == "/" and peek == "/" then
|
|
skiplinecomment();
|
|
else
|
|
return;
|
|
end
|
|
end
|
|
end
|
|
|
|
local readvalue;
|
|
local function readarray()
|
|
local t = {};
|
|
next(); -- skip '['
|
|
skipstuff();
|
|
if ch == "]" then next(); return t; end
|
|
t_insert(t, readvalue());
|
|
while true do
|
|
skipstuff();
|
|
if ch == "]" then next(); return t; end
|
|
if not ch then error("eof while reading array");
|
|
elseif ch == "," then next();
|
|
elseif ch then error("unexpected character in array, comma expected"); end
|
|
if not ch then error("eof while reading array"); end
|
|
t_insert(t, readvalue());
|
|
end
|
|
end
|
|
|
|
local function checkandskip(c)
|
|
local x = ch or "eof";
|
|
if x ~= c then error("unexpected "..x..", '"..c.."' expected"); end
|
|
next();
|
|
end
|
|
local function readliteral(lit, val)
|
|
for c in lit:gmatch(".") do
|
|
checkandskip(c);
|
|
end
|
|
return val;
|
|
end
|
|
local function readstring()
|
|
local s = "";
|
|
checkandskip("\"");
|
|
while ch do
|
|
while ch and ch ~= "\\" and ch ~= "\"" do
|
|
s = s..ch; next();
|
|
end
|
|
if ch == "\\" then
|
|
next();
|
|
if unescapes[ch] then
|
|
s = s..unescapes[ch];
|
|
next();
|
|
elseif ch == "u" then
|
|
local seq = "";
|
|
for i=1,4 do
|
|
next();
|
|
if not ch then error("unexpected eof in string"); end
|
|
if not ch:match("[0-9a-fA-F]") then error("invalid unicode escape sequence in string"); end
|
|
seq = seq..ch;
|
|
end
|
|
s = s..s.char(tonumber(seq, 16)); -- FIXME do proper utf-8
|
|
next();
|
|
else error("invalid escape sequence in string"); end
|
|
end
|
|
if ch == "\"" then
|
|
next();
|
|
return s;
|
|
end
|
|
end
|
|
error("eof while reading string");
|
|
end
|
|
local function readnumber()
|
|
local s = "";
|
|
if ch == "-" then
|
|
s = s..ch; next();
|
|
if not ch:match("[0-9]") then error("number format error"); end
|
|
end
|
|
if ch == "0" then
|
|
s = s..ch; next();
|
|
if ch:match("[0-9]") then error("number format error"); end
|
|
else
|
|
while ch and ch:match("[0-9]") do
|
|
s = s..ch; next();
|
|
end
|
|
end
|
|
if ch == "." then
|
|
s = s..ch; next();
|
|
if not ch:match("[0-9]") then error("number format error"); end
|
|
while ch and ch:match("[0-9]") do
|
|
s = s..ch; next();
|
|
end
|
|
if ch == "e" or ch == "E" then
|
|
s = s..ch; next();
|
|
if ch == "+" or ch == "-" then
|
|
s = s..ch; next();
|
|
if not ch:match("[0-9]") then error("number format error"); end
|
|
while ch and ch:match("[0-9]") do
|
|
s = s..ch; next();
|
|
end
|
|
end
|
|
end
|
|
end
|
|
return tonumber(s);
|
|
end
|
|
local function readmember(t)
|
|
skipstuff();
|
|
local k = readstring();
|
|
skipstuff();
|
|
checkandskip(":");
|
|
t[k] = readvalue();
|
|
end
|
|
local function fixobject(obj)
|
|
local __array = obj.__array;
|
|
if __array then
|
|
obj.__array = nil;
|
|
for i,v in ipairs(__array) do
|
|
t_insert(obj, v);
|
|
end
|
|
end
|
|
local __hash = obj.__hash;
|
|
if __hash then
|
|
obj.__hash = nil;
|
|
local k;
|
|
for i,v in ipairs(__hash) do
|
|
if k ~= nil then
|
|
obj[k] = v; k = nil;
|
|
else
|
|
k = v;
|
|
end
|
|
end
|
|
end
|
|
return obj;
|
|
end
|
|
local function readobject()
|
|
local t = {};
|
|
next(); -- skip '{'
|
|
skipstuff();
|
|
if ch == "}" then next(); return t; end
|
|
if not ch then error("eof while reading object"); end
|
|
readmember(t);
|
|
while true do
|
|
skipstuff();
|
|
if ch == "}" then next(); return fixobject(t); end
|
|
if not ch then error("eof while reading object");
|
|
elseif ch == "," then next();
|
|
elseif ch then error("unexpected character in object, comma expected"); end
|
|
if not ch then error("eof while reading object"); end
|
|
readmember(t);
|
|
end
|
|
end
|
|
|
|
function readvalue()
|
|
skipstuff();
|
|
while ch do
|
|
if ch == "{" then
|
|
return readobject();
|
|
elseif ch == "[" then
|
|
return readarray();
|
|
elseif ch == "\"" then
|
|
return readstring();
|
|
elseif ch:match("[%-0-9%.]") then
|
|
return readnumber();
|
|
elseif ch == "n" then
|
|
return readliteral("null", null);
|
|
elseif ch == "t" then
|
|
return readliteral("true", true);
|
|
elseif ch == "f" then
|
|
return readliteral("false", false);
|
|
else
|
|
error("invalid character at value start: "..ch);
|
|
end
|
|
end
|
|
error("eof while reading value");
|
|
end
|
|
next();
|
|
return readvalue();
|
|
end
|
|
|
|
function json.test(object)
|
|
local encoded = json.encode(object);
|
|
local decoded = json.decode(encoded);
|
|
local recoded = json.encode(decoded);
|
|
if encoded ~= recoded then
|
|
print("FAILED");
|
|
print("encoded:", encoded);
|
|
print("recoded:", recoded);
|
|
else
|
|
print(encoded);
|
|
end
|
|
return encoded == recoded;
|
|
end
|
|
|
|
return json;
|