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util/json.lua @ 12975:d10957394a3c
util: Prefix module imports with prosody namespace
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Fri, 17 Mar 2023 16:23:16 +0100 |
| parent | 12792:997f3ca90628 |
| rev | line source |
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1 -- Prosody IM |
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2 -- Copyright (C) 2008-2010 Matthew Wild |
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3 -- Copyright (C) 2008-2010 Waqas Hussain |
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4 -- |
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5 -- This project is MIT/X11 licensed. Please see the |
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6 -- COPYING file in the source package for more information. |
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7 -- |
| 3979 | 8 |
| 9 local type = type; | |
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10 local t_insert, t_concat, t_remove = table.insert, table.concat, table.remove; |
| 3979 | 11 local s_char = string.char; |
| 12 local tostring, tonumber = tostring, tonumber; | |
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13 local pairs, ipairs, spairs = pairs, ipairs, require "prosody.util.iterators".sorted_pairs; |
| 3979 | 14 local next = next; |
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15 local getmetatable, setmetatable = getmetatable, setmetatable; |
| 3979 | 16 local print = print; |
| 17 | |
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18 local has_array, array = pcall(require, "prosody.util.array"); |
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19 local array_mt = has_array and getmetatable(array()) or {}; |
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20 |
| 3979 | 21 --module("json") |
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22 local module = {}; |
| 3979 | 23 |
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24 local null = setmetatable({}, { __tostring = function() return "null"; end; }); |
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25 module.null = null; |
| 3979 | 26 |
| 27 local escapes = { | |
| 28 ["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b", | |
| 29 ["\f"] = "\\f", ["\n"] = "\\n", ["\r"] = "\\r", ["\t"] = "\\t"}; | |
| 30 for i=0,31 do | |
| 31 local ch = s_char(i); | |
| 32 if not escapes[ch] then escapes[ch] = ("\\u%.4X"):format(i); end | |
| 33 end | |
| 34 | |
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35 local function codepoint_to_utf8(code) |
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36 if code < 0x80 then return s_char(code); end |
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37 local bits0_6 = code % 64; |
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38 if code < 0x800 then |
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39 local bits6_5 = (code - bits0_6) / 64; |
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40 return s_char(0x80 + 0x40 + bits6_5, 0x80 + bits0_6); |
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41 end |
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42 local bits0_12 = code % 4096; |
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43 local bits6_6 = (bits0_12 - bits0_6) / 64; |
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44 local bits12_4 = (code - bits0_12) / 4096; |
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45 return s_char(0x80 + 0x40 + 0x20 + bits12_4, 0x80 + bits6_6, 0x80 + bits0_6); |
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46 end |
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47 |
| 3979 | 48 local valid_types = { |
| 49 number = true, | |
| 50 string = true, | |
| 51 table = true, | |
| 52 boolean = true | |
| 53 }; | |
| 54 local special_keys = { | |
| 55 __array = true; | |
| 56 __hash = true; | |
| 57 }; | |
| 58 | |
| 59 local simplesave, tablesave, arraysave, stringsave; | |
| 60 | |
| 61 function stringsave(o, buffer) | |
| 62 -- FIXME do proper utf-8 and binary data detection | |
| 63 t_insert(buffer, "\""..(o:gsub(".", escapes)).."\""); | |
| 64 end | |
| 65 | |
| 66 function arraysave(o, buffer) | |
| 67 t_insert(buffer, "["); | |
| 68 if next(o) then | |
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69 for _, v in ipairs(o) do |
| 3979 | 70 simplesave(v, buffer); |
| 71 t_insert(buffer, ","); | |
| 72 end | |
| 73 t_remove(buffer); | |
| 74 end | |
| 75 t_insert(buffer, "]"); | |
| 76 end | |
| 77 | |
| 78 function tablesave(o, buffer) | |
| 79 local __array = {}; | |
| 80 local __hash = {}; | |
| 81 local hash = {}; | |
| 82 for i,v in ipairs(o) do | |
| 83 __array[i] = v; | |
| 84 end | |
| 85 for k,v in pairs(o) do | |
| 86 local ktype, vtype = type(k), type(v); | |
| 87 if valid_types[vtype] or v == null then | |
| 88 if ktype == "string" and not special_keys[k] then | |
| 89 hash[k] = v; | |
| 90 elseif (valid_types[ktype] or k == null) and __array[k] == nil then | |
| 91 __hash[k] = v; | |
| 92 end | |
| 93 end | |
| 94 end | |
| 95 if next(__hash) ~= nil or next(hash) ~= nil or next(__array) == nil then | |
| 96 t_insert(buffer, "{"); | |
| 97 local mark = #buffer; | |
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98 local _pairs = buffer.ordered and spairs or pairs; |
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99 for k,v in _pairs(hash) do |
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100 stringsave(k, buffer); |
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101 t_insert(buffer, ":"); |
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102 simplesave(v, buffer); |
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103 t_insert(buffer, ","); |
| 3979 | 104 end |
| 105 if next(__hash) ~= nil then | |
| 106 t_insert(buffer, "\"__hash\":["); | |
| 107 for k,v in pairs(__hash) do | |
| 108 simplesave(k, buffer); | |
| 109 t_insert(buffer, ","); | |
| 110 simplesave(v, buffer); | |
| 111 t_insert(buffer, ","); | |
| 112 end | |
| 113 t_remove(buffer); | |
| 114 t_insert(buffer, "]"); | |
| 115 t_insert(buffer, ","); | |
| 116 end | |
| 117 if next(__array) then | |
| 118 t_insert(buffer, "\"__array\":"); | |
| 119 arraysave(__array, buffer); | |
| 120 t_insert(buffer, ","); | |
| 121 end | |
| 122 if mark ~= #buffer then t_remove(buffer); end | |
| 123 t_insert(buffer, "}"); | |
| 124 else | |
| 125 arraysave(__array, buffer); | |
| 126 end | |
| 127 end | |
| 128 | |
| 129 function simplesave(o, buffer) | |
| 130 local t = type(o); | |
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131 if o == null then |
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132 t_insert(buffer, "null"); |
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133 elseif t == "number" then |
| 3979 | 134 t_insert(buffer, tostring(o)); |
| 135 elseif t == "string" then | |
| 136 stringsave(o, buffer); | |
| 137 elseif t == "table" then | |
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138 local mt = getmetatable(o); |
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139 if mt == array_mt then |
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140 arraysave(o, buffer); |
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141 else |
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142 tablesave(o, buffer); |
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143 end |
| 3979 | 144 elseif t == "boolean" then |
| 145 t_insert(buffer, (o and "true" or "false")); | |
| 146 else | |
| 147 t_insert(buffer, "null"); | |
| 148 end | |
| 149 end | |
| 150 | |
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151 function module.encode(obj) |
| 3979 | 152 local t = {}; |
| 153 simplesave(obj, t); | |
| 154 return t_concat(t); | |
| 155 end | |
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156 function module.encode_ordered(obj) |
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157 local t = { ordered = true }; |
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158 simplesave(obj, t); |
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159 return t_concat(t); |
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160 end |
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161 function module.encode_array(obj) |
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162 local t = {}; |
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163 arraysave(obj, t); |
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164 return t_concat(t); |
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165 end |
| 3979 | 166 |
| 167 ----------------------------------- | |
| 168 | |
| 169 | |
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170 local function _skip_whitespace(json, index) |
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171 return json:find("[^ \t\r\n]", index) or index; -- no need to check \r\n, we converted those to \t |
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172 end |
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173 local function _fixobject(obj) |
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174 local __array = obj.__array; |
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175 if __array then |
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176 obj.__array = nil; |
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177 for _, v in ipairs(__array) do |
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178 t_insert(obj, v); |
| 3979 | 179 end |
| 180 end | |
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181 local __hash = obj.__hash; |
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182 if __hash then |
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183 obj.__hash = nil; |
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184 local k; |
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185 for _, v in ipairs(__hash) do |
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186 if k ~= nil then |
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187 obj[k] = v; k = nil; |
| 3979 | 188 else |
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189 k = v; |
| 3979 | 190 end |
| 191 end | |
| 192 end | |
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193 return obj; |
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194 end |
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195 local _readvalue, _readstring; |
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196 local function _readobject(json, index) |
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197 local o = {}; |
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198 while true do |
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199 local key, val; |
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200 index = _skip_whitespace(json, index + 1); |
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201 if json:byte(index) ~= 0x22 then -- "\"" |
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202 if json:byte(index) == 0x7d then return o, index + 1; end -- "}" |
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203 return nil, "key expected"; |
| 3979 | 204 end |
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205 key, index = _readstring(json, index); |
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206 if key == nil then return nil, index; end |
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207 index = _skip_whitespace(json, index); |
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208 if json:byte(index) ~= 0x3a then return nil, "colon expected"; end -- ":" |
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209 val, index = _readvalue(json, index + 1); |
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210 if val == nil then return nil, index; end |
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211 o[key] = val; |
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212 index = _skip_whitespace(json, index); |
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213 local b = json:byte(index); |
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214 if b == 0x7d then return _fixobject(o), index + 1; end -- "}" |
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215 if b ~= 0x2c then return nil, "object eof"; end -- "," |
| 3979 | 216 end |
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217 end |
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218 local function _readarray(json, index) |
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219 local a = {}; |
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220 while true do |
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221 local val, terminated; |
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222 val, index, terminated = _readvalue(json, index + 1, 0x5d); |
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223 if val == nil then |
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224 if terminated then -- "]" found instead of value |
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225 if #a ~= 0 then |
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226 -- A non-empty array here means we processed a comma, |
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227 -- but it wasn't followed by a value. JSON doesn't allow |
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228 -- trailing commas. |
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229 return nil, "value expected"; |
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230 end |
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231 val, index = setmetatable(a, array_mt), index+1; |
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232 end |
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233 return val, index; |
| 3979 | 234 end |
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235 t_insert(a, val); |
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236 index = _skip_whitespace(json, index); |
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237 local b = json:byte(index); |
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238 if b == 0x5d then return setmetatable(a, array_mt), index + 1; end -- "]" |
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239 if b ~= 0x2c then return nil, "array eof"; end -- "," |
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240 end |
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241 end |
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242 local _unescape_error; |
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243 local function _unescape_surrogate_func(x) |
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244 local lead, trail = tonumber(x:sub(3, 6), 16), tonumber(x:sub(9, 12), 16); |
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245 local codepoint = lead * 0x400 + trail - 0x35FDC00; |
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246 local a = codepoint % 64; |
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247 codepoint = (codepoint - a) / 64; |
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248 local b = codepoint % 64; |
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249 codepoint = (codepoint - b) / 64; |
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250 local c = codepoint % 64; |
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251 codepoint = (codepoint - c) / 64; |
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252 return s_char(0xF0 + codepoint, 0x80 + c, 0x80 + b, 0x80 + a); |
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253 end |
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254 local function _unescape_func(x) |
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255 x = x:match("%x%x%x%x", 3); |
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256 if x then |
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257 local codepoint = tonumber(x, 16) |
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258 if codepoint >= 0xD800 and codepoint <= 0xDFFF then _unescape_error = true; end -- bad surrogate pair |
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259 return codepoint_to_utf8(codepoint); |
| 3979 | 260 end |
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261 _unescape_error = true; |
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262 end |
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263 function _readstring(json, index) |
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264 index = index + 1; |
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265 local endindex = json:find("\"", index, true); |
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266 if endindex then |
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267 local s = json:sub(index, endindex - 1); |
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268 --if s:find("[%z-\31]") then return nil, "control char in string"; end |
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269 -- FIXME handle control characters |
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270 _unescape_error = nil; |
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271 s = s:gsub("\\u[dD][89abAB]%x%x\\u[dD][cdefCDEF]%x%x", _unescape_surrogate_func); |
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272 -- FIXME handle escapes beyond BMP |
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273 s = s:gsub("\\u.?.?.?.?", _unescape_func); |
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274 if _unescape_error then return nil, "invalid escape"; end |
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275 return s, endindex + 1; |
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276 end |
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277 return nil, "string eof"; |
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278 end |
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279 local function _readnumber(json, index) |
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280 local m = json:match("[0-9%.%-eE%+]+", index); -- FIXME do strict checking |
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281 return tonumber(m), index + #m; |
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282 end |
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283 local function _readnull(json, index) |
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284 local a, b, c = json:byte(index + 1, index + 3); |
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285 if a == 0x75 and b == 0x6c and c == 0x6c then |
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286 return null, index + 4; |
| 3979 | 287 end |
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288 return nil, "null parse failed"; |
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289 end |
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290 local function _readtrue(json, index) |
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291 local a, b, c = json:byte(index + 1, index + 3); |
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292 if a == 0x72 and b == 0x75 and c == 0x65 then |
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293 return true, index + 4; |
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294 end |
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295 return nil, "true parse failed"; |
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296 end |
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297 local function _readfalse(json, index) |
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298 local a, b, c, d = json:byte(index + 1, index + 4); |
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299 if a == 0x61 and b == 0x6c and c == 0x73 and d == 0x65 then |
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300 return false, index + 5; |
| 3979 | 301 end |
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302 return nil, "false parse failed"; |
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303 end |
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304 function _readvalue(json, index, terminator) |
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305 index = _skip_whitespace(json, index); |
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306 local b = json:byte(index); |
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307 -- TODO try table lookup instead of if-else? |
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308 if b == 0x7B then -- "{" |
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309 return _readobject(json, index); |
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310 elseif b == 0x5B then -- "[" |
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311 return _readarray(json, index); |
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312 elseif b == 0x22 then -- "\"" |
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313 return _readstring(json, index); |
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314 elseif b ~= nil and b >= 0x30 and b <= 0x39 or b == 0x2d then -- "0"-"9" or "-" |
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315 return _readnumber(json, index); |
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316 elseif b == 0x6e then -- "n" |
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317 return _readnull(json, index); |
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318 elseif b == 0x74 then -- "t" |
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319 return _readtrue(json, index); |
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320 elseif b == 0x66 then -- "f" |
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321 return _readfalse(json, index); |
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322 elseif b == terminator then |
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323 return nil, index, true; |
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324 else |
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325 return nil, "value expected"; |
| 3979 | 326 end |
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327 end |
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328 local first_escape = { |
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329 ["\\\""] = "\\u0022"; |
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330 ["\\\\"] = "\\u005c"; |
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331 ["\\/" ] = "\\u002f"; |
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332 ["\\b" ] = "\\u0008"; |
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333 ["\\f" ] = "\\u000C"; |
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334 ["\\n" ] = "\\u000A"; |
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335 ["\\r" ] = "\\u000D"; |
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336 ["\\t" ] = "\\u0009"; |
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337 ["\\u" ] = "\\u"; |
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338 }; |
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339 |
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340 function module.decode(json) |
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341 json = json:gsub("\\.", first_escape) -- get rid of all escapes except \uXXXX, making string parsing much simpler |
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342 --:gsub("[\r\n]", "\t"); -- \r\n\t are equivalent, we care about none of them, and none of them can be in strings |
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343 |
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344 -- TODO do encoding verification |
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345 |
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346 local val, index = _readvalue(json, 1); |
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347 if val == nil then return val, index; end |
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348 if json:find("[^ \t\r\n]", index) then return nil, "garbage at eof"; end |
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349 |
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350 return val; |
| 3979 | 351 end |
| 352 | |
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353 function module.test(object) |
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354 local encoded = module.encode(object); |
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355 local decoded = module.decode(encoded); |
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356 local recoded = module.encode(decoded); |
| 3979 | 357 if encoded ~= recoded then |
| 358 print("FAILED"); | |
| 359 print("encoded:", encoded); | |
| 360 print("recoded:", recoded); | |
| 361 else | |
| 362 print(encoded); | |
| 363 end | |
| 364 return encoded == recoded; | |
| 365 end | |
| 366 | |
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367 return module; |
