prosody
88e1b94105ae
util/json.lua

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util/json.lua @ 12500:88e1b94105ae 0.12

util.jsonschema: Lua <5.3 compat here too
author Kim Alvefur <zash@zash.se>
date Mon, 09 May 2022 22:39:05 +0200
parent 9329:19bc3ec13f07
child 12792:997f3ca90628
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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 --
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8
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9 local type = type;
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10 local t_insert, t_concat, t_remove = table.insert, table.concat, table.remove;
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11 local s_char = string.char;
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12 local tostring, tonumber = tostring, tonumber;
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13 local pairs, ipairs, spairs = pairs, ipairs, require "util.iterators".sorted_pairs;
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14 local next = next;
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15 local getmetatable, setmetatable = getmetatable, setmetatable;
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16 local print = print;
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17
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18 local has_array, array = pcall(require, "util.array");
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19 local array_mt = has_array and getmetatable(array()) or {};
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20
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21 --module("json")
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22 local module = {};
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23
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24 local null = setmetatable({}, { __tostring = function() return "null"; end; });
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25 module.null = null;
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26
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27 local escapes = {
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28 ["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b",
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29 ["\f"] = "\\f", ["\n"] = "\\n", ["\r"] = "\\r", ["\t"] = "\\t"};
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30 for i=0,31 do
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31 local ch = s_char(i);
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32 if not escapes[ch] then escapes[ch] = ("\\u%.4X"):format(i); end
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33 end
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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
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48 local valid_types = {
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49 number = true,
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50 string = true,
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51 table = true,
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52 boolean = true
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53 };
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54 local special_keys = {
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55 __array = true;
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56 __hash = true;
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57 };
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58
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59 local simplesave, tablesave, arraysave, stringsave;
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60
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61 function stringsave(o, buffer)
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62 -- FIXME do proper utf-8 and binary data detection
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63 t_insert(buffer, "\""..(o:gsub(".", escapes)).."\"");
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64 end
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65
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66 function arraysave(o, buffer)
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67 t_insert(buffer, "[");
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68 if next(o) then
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69 for _, v in ipairs(o) do
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70 simplesave(v, buffer);
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71 t_insert(buffer, ",");
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72 end
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73 t_remove(buffer);
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74 end
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75 t_insert(buffer, "]");
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76 end
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77
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78 function tablesave(o, buffer)
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79 local __array = {};
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80 local __hash = {};
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81 local hash = {};
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82 for i,v in ipairs(o) do
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83 __array[i] = v;
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84 end
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85 for k,v in pairs(o) do
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86 local ktype, vtype = type(k), type(v);
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87 if valid_types[vtype] or v == null then
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88 if ktype == "string" and not special_keys[k] then
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89 hash[k] = v;
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90 elseif (valid_types[ktype] or k == null) and __array[k] == nil then
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91 __hash[k] = v;
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92 end
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93 end
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94 end
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95 if next(__hash) ~= nil or next(hash) ~= nil or next(__array) == nil then
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96 t_insert(buffer, "{");
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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, ",");
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104 end
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105 if next(__hash) ~= nil then
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106 t_insert(buffer, "\"__hash\":[");
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107 for k,v in pairs(__hash) do
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108 simplesave(k, buffer);
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109 t_insert(buffer, ",");
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110 simplesave(v, buffer);
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111 t_insert(buffer, ",");
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112 end
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113 t_remove(buffer);
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114 t_insert(buffer, "]");
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115 t_insert(buffer, ",");
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116 end
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117 if next(__array) then
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118 t_insert(buffer, "\"__array\":");
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119 arraysave(__array, buffer);
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120 t_insert(buffer, ",");
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121 end
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122 if mark ~= #buffer then t_remove(buffer); end
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123 t_insert(buffer, "}");
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124 else
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125 arraysave(__array, buffer);
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126 end
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127 end
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128
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129 function simplesave(o, buffer)
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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
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134 t_insert(buffer, tostring(o));
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135 elseif t == "string" then
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136 stringsave(o, buffer);
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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
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144 elseif t == "boolean" then
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145 t_insert(buffer, (o and "true" or "false"));
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146 else
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147 t_insert(buffer, "null");
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148 end
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149 end
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150
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151 function module.encode(obj)
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152 local t = {};
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153 simplesave(obj, t);
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154 return t_concat(t);
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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
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166
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167 -----------------------------------
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168
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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);
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179 end
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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;
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188 else
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189 k = v;
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190 end
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191 end
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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";
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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 -- ","
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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 local oindex = index;
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221 while true do
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222 local val;
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223 val, index = _readvalue(json, index + 1);
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224 if val == nil then
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225 if json:byte(oindex + 1) == 0x5d then return setmetatable(a, array_mt), oindex + 2; end -- "]"
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226 return val, index;
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227 end
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228 t_insert(a, val);
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229 index = _skip_whitespace(json, index);
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230 local b = json:byte(index);
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231 if b == 0x5d then return setmetatable(a, array_mt), index + 1; end -- "]"
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232 if b ~= 0x2c then return nil, "array eof"; end -- ","
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233 end
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234 end
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235 local _unescape_error;
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236 local function _unescape_surrogate_func(x)
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237 local lead, trail = tonumber(x:sub(3, 6), 16), tonumber(x:sub(9, 12), 16);
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238 local codepoint = lead * 0x400 + trail - 0x35FDC00;
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239 local a = codepoint % 64;
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240 codepoint = (codepoint - a) / 64;
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241 local b = codepoint % 64;
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242 codepoint = (codepoint - b) / 64;
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243 local c = codepoint % 64;
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244 codepoint = (codepoint - c) / 64;
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245 return s_char(0xF0 + codepoint, 0x80 + c, 0x80 + b, 0x80 + a);
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246 end
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247 local function _unescape_func(x)
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248 x = x:match("%x%x%x%x", 3);
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249 if x then
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250 local codepoint = tonumber(x, 16)
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251 if codepoint >= 0xD800 and codepoint <= 0xDFFF then _unescape_error = true; end -- bad surrogate pair
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252 return codepoint_to_utf8(codepoint);
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253 end
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254 _unescape_error = true;
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255 end
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256 function _readstring(json, index)
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257 index = index + 1;
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258 local endindex = json:find("\"", index, true);
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259 if endindex then
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260 local s = json:sub(index, endindex - 1);
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261 --if s:find("[%z-\31]") then return nil, "control char in string"; end
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262 -- FIXME handle control characters
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263 _unescape_error = nil;
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264 s = s:gsub("\\u[dD][89abAB]%x%x\\u[dD][cdefCDEF]%x%x", _unescape_surrogate_func);
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265 -- FIXME handle escapes beyond BMP
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266 s = s:gsub("\\u.?.?.?.?", _unescape_func);
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267 if _unescape_error then return nil, "invalid escape"; end
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268 return s, endindex + 1;
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269 end
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270 return nil, "string eof";
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271 end
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272 local function _readnumber(json, index)
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273 local m = json:match("[0-9%.%-eE%+]+", index); -- FIXME do strict checking
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274 return tonumber(m), index + #m;
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275 end
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276 local function _readnull(json, index)
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277 local a, b, c = json:byte(index + 1, index + 3);
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278 if a == 0x75 and b == 0x6c and c == 0x6c then
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279 return null, index + 4;
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280 end
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281 return nil, "null parse failed";
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282 end
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283 local function _readtrue(json, index)
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284 local a, b, c = json:byte(index + 1, index + 3);
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285 if a == 0x72 and b == 0x75 and c == 0x65 then
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286 return true, index + 4;
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287 end
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288 return nil, "true parse failed";
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289 end
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290 local function _readfalse(json, index)
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291 local a, b, c, d = json:byte(index + 1, index + 4);
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292 if a == 0x61 and b == 0x6c and c == 0x73 and d == 0x65 then
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293 return false, index + 5;
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294 end
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295 return nil, "false parse failed";
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296 end
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297 function _readvalue(json, index)
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298 index = _skip_whitespace(json, index);
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299 local b = json:byte(index);
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300 -- TODO try table lookup instead of if-else?
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301 if b == 0x7B then -- "{"
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302 return _readobject(json, index);
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303 elseif b == 0x5B then -- "["
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304 return _readarray(json, index);
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305 elseif b == 0x22 then -- "\""
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306 return _readstring(json, index);
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307 elseif b ~= nil and b >= 0x30 and b <= 0x39 or b == 0x2d then -- "0"-"9" or "-"
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308 return _readnumber(json, index);
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309 elseif b == 0x6e then -- "n"
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310 return _readnull(json, index);
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311 elseif b == 0x74 then -- "t"
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312 return _readtrue(json, index);
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313 elseif b == 0x66 then -- "f"
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314 return _readfalse(json, index);
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315 else
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316 return nil, "value expected";
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317 end
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318 end
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319 local first_escape = {
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320 ["\\\""] = "\\u0022";
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321 ["\\\\"] = "\\u005c";
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322 ["\\/" ] = "\\u002f";
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323 ["\\b" ] = "\\u0008";
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324 ["\\f" ] = "\\u000C";
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325 ["\\n" ] = "\\u000A";
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326 ["\\r" ] = "\\u000D";
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327 ["\\t" ] = "\\u0009";
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328 ["\\u" ] = "\\u";
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329 };
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330
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331 function module.decode(json)
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332 json = json:gsub("\\.", first_escape) -- get rid of all escapes except \uXXXX, making string parsing much simpler
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333 --: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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334
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335 -- TODO do encoding verification
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336
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337 local val, index = _readvalue(json, 1);
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338 if val == nil then return val, index; end
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339 if json:find("[^ \t\r\n]", index) then return nil, "garbage at eof"; end
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340
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341 return val;
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342 end
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343
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344 function module.test(object)
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345 local encoded = module.encode(object);
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346 local decoded = module.decode(encoded);
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347 local recoded = module.encode(decoded);
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348 if encoded ~= recoded then
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349 print("FAILED");
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350 print("encoded:", encoded);
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351 print("recoded:", recoded);
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352 else
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353 print(encoded);
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354 end
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355 return encoded == recoded;
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356 end
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357
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358 return module;